KOR-LOK® Side Action Systems

KOR-LOK 70 Series "MINI" KOR-LOK® 70 SERIES Designed and Made in the USA HYDRAULIC LOCKING CYLINDER A new cylinder created
just for the smallest of spaces.
KOR-LOK KOR-LOK® MAKING PARTS PERFECT! PFA’s preloading hydraulic locking cylinders that remain locked and preloaded when machine pressure drops ensure core faces will not move during injection. Providing all the force you desire and achieving perfect part production is our goal. Tremendous Force Intensification Hydraulic Locking Cylinders with Full Preloading Locked In at Zero PSI. UP TO 100 TONS OF PRELOAD PRECISION FEATURE CONTROL PRECISION FEATURE CONTROL PFA Hydraulic Locking Cylinders are fast-acting, compact, and flexible, providing precision placement of cores and perfect results. External to base mounting and mounting at any angle ensures maximum design flexibility and maximum mold performance. MEDICAL AND COMPLEX COMPONENTS MADE PERFECTLY ULTIMATE LOCKING CYLINDER ULTIMATE LOCKING CYLINDER KOR-LOK® Side Action Systems offer high preload forces in a small flexible package. Fast customized product means more efficient mold designs and faster mold builds. PFA Hydraulic Locking Cylinders feature high-speed operation, full preload at low pressure, easy installation adjustment, multiple cylinder slide sensor integration, rear multi-port configurations, multi-sensor locations, and blank flange mounting flexibility. HAVE IT YOUR WAY - OFF THE SHELF SWITCHMAX SWITCHMAX® SWITCHMAX® connectivity solutions integrate ALL your core sensors – Locking Cylinder Sensors, Other Cylinder sensors, mechanical rocker switches – for a single set and pull input to the press. Standardized plug and play components offer the ability to bring consistent wiring and LED indication to all molds with a simple and easy off-the-shelf solution. PLUG AND PLAY WIRING SOLUTIONS

Attention Mold and Die Builders

KOR-LOK® is the Hydraulic Locking Core Pull Cylinder recommended for all Injection Molding and Die Casting applications regardless of how the action pulls (parting line, side-action, angled, wedge, etc.). Preloading and Locking functions in the KOR-LOK are critical to success. If you are new to PFA’s products, please review the information below and/or contact PFA for our free application review and further assistance. Your success is important to us! Please call 262-250-4410.

Why Choose KOR-LOK®

More Than a Locking Cylinder:

The PFA KOR-LOK® Side-Action System sets itself apart from other Hydraulic Core Pull and Locking Cylinders by virtue of it’s ability to Preload cores to high forces. Spring locking hydraulic activated locking cylinders and other piston locking cylinders cannot achieve preload to rated load and cannot maintain that preload at zero psi. While PFA makes other locking cylinders for general industrial use, only the KOR-LOK® achieves high force preload and cylinder locking to fully rated load in a simple to install system. At PFA, we feel understanding core forces under injection, understanding the required preload necessary to overcome those force, and knowing the operation of possible solutions, is critical to choosing the correct “locking” cylinder.

Steel Compression:

Physics dictates that a pressure force applied to any material will cause compression. Without the ability to easily measure it during loading, it is often “invisible” to practical experience, leading to the false assumption that steel, for example, is incompressible and core dimensions will not change under load.

Thermal Variation:

Physics dictates that temperature changes will change the size of an object. Like compression, temperature changes are less likely to be considered and are difficult to measure. Initial reviews often assume that temperature is not an issue.

Core Changes look like “Backup”:

During injection, the resulting changes from pressure and temperature often cause the core length to decrease and the resulting core face position to be “backed up” from the desired position. These changes are “seen” on the part, as if the entire core was “backing up”, when in fact the no load room temperature timing was correct. Core face “backup” during injection may be as much as .020″ or more depending on mold geometry.

USING A HOLDING FORCE DESIGN

Using holding force against injection is a bad idea.

HOLDING FORCE = BAD PARTS
CORE FACE and SHUTOFF ALWAYS MOVE

Before Injection: Held in place only
During Injection: Core compresses. Rod compresses. Entire core body backs up.

Using a Holding Force Design

USING A PRELOAD FORCE DESIGN

Using preload force against injection is the right idea.

FULL PRELOAD = GREAT PARTS
ALWAYS ZERO MOVEMENT

Before Injection:  Preload Force (PF) generates a load on the stops – Stop Force (SF) is created.
During Injection: Injection Force takes up and reduces some of the stop force.
Zero Movement: If Preload (PF) > Injection Force (IF), then Stop Force (SF) always > 0.  Core Always touching stops, no movement.

Using a Preload Force Design

KOR-LOK PRELOADS AND FULLY LOCKS.
100% PRELOAD AT ZERO PSI PROVES IT!

Conventional "Reactive" Core Slide Positioning
An example of a conventional side-action system is to the left. A cam pin provides the means of movement and the heel block “locks” the slide in the tool. This system “reacts” to the pressure and thermal effects with the result that the core face shows “backup”.
New "Proactive" (KOR-LOK®) Core Slide Positioning
PFA’s KOR-LOK® Side-Action Systems are specifically designed to produce 10x the power of standard cylinders at end of stroke to preload the core above the injection force and then lock that force in place.
“Reactive” Method “Proactive” Method
Cam Pins, Standard Locking Cylinders, Cavity Locks, Heel Blocks, Hydraulic Cylinders KOR-LOK® Side-Action Systems
In the past, core applications required choosing the best REACTIVE method available, reacting to force but not applying it. If it’s not applied force, it’s not maintaining position. KOR-LOK®’s PROACTIVE Technology™ and 100% applied force provides you with the advantages of Zero Flash™, Zero Flex™ performance.
“Reactive” Method “Proactive” Method
Cam Pins, Standard Locking Cylinders, Cavity Locks, Heel Blocks, Hydraulic Cylinders KOR-LOK® Side-Action Systems
In the past, core applications required choosing the best REACTIVE method available, reacting to force but not applying it. If it’s not applied force, it’s not maintaining position. KOR-LOK®’s PROACTIVE Technology™ and 100% applied force provides you with the advantages of Zero Flash™, Zero Flex™ performance.

Zero Flash Performance is Just the Beginning

We’re Saving You Time and Money Every Step of the Way

PART DESIGN – Complex parts made easy.

Core preload means your parts can be made easily with tighter tolerances, perfect match lines, and clean beautiful textures. The all-in-one system means cores can move at any angle any time, eliminating barriers to many complex parts. Specify PFA for design freedom. Indulge yourself.

MOLD DESIGN – Bolt-on actions simplify the mold.

PFA ‘s turn-key system not only makes any side-action easy, it eliminates the “one off” design and manufacture of side actions. Design it right the first time, every time with a proven system that does the job better. Technical help is available 24 hours a day and CAD files are just a click away. Design it better and faster with KOR-LOK®.

MOLD BUILD – Modular means faster and easier builds.

Simplified mold geometries, better slide performance, smaller mold bases, and independent slide movement, all mean quicker mold builds and reduced tryout time. Faster build times, fewer tryouts, and excellent part quality make your molds more competitive.

PRODUCTION – Achieve the lowest cost per part.

KOR-LOK® helps you run the best parts possible in the smallest press possible. Ensure you produce the parts you want, when you want them – reduced maintenance means improved up-time, consistent quality means less scrap, and reduced cost per part means more profit.

kor-lok-car-diagram

The Only Way to Achieve True Zero Flash Results,
Part After Part, is With KOR-LOK® Side Action Systems…

kor-lok-zero-flash-chart

KOR-LOK® gives you:
• Perfect Match Lines • Quicker Mold Build • Consistent Part Quality
• Simplified Part Design • Lower Mold Costs • Simplified Mold Design
• Reduced Cost-Per-Part • Proven Design Performance • Smaller Mold Bases
• Unlimited Slide Travel • Greatly Reduced Wear • Unrestricted Orientation
• Reduced Spotting Time

How it Works

It Looks a Lot Like a Cylinder But it Performs Like a KOR-LOK®

(Select items from the image below to get a detailed description of individual components)

KOR-LOK® System

2D PFA Hydraulic Locking Cylinder Core Pull KOR-LOK How it moves and works

KOR-LOK® 3D View

3D PFA Hydraulic Locking Cylinder Core Pull KOR-LOK How it moves and works

KOR-LOK® Side-Action Systems provide large pre-loads and thermal compensation to core slides by use of an internal tapered locking mechanism. The threaded housing provides a base to support the locking mechanism and transfer load between the mold and the core slide, as follows:

  • SET – The rod is extended using extend pressure. As the rod nears end of stroke, the locking segments are forced into the rod groove by hydraulic pressure on the locking slide. As the segments are “squeezed,” the rod is forced forward ensuring a positive seal on the core face, while activating the sensor.
  • PULL – Retract pressure releases the locking slide, allowing the segments to disengage as the piston retracts. When fully retracted, the rear sensor is activated, indicating the slide is fully retracted.

Once set using only a minimum of 1,500 psi hydraulics, KOR-LOK® Side-Action Systems provide 100% preload to rated load – 10 times more force than a standard cylinder. KOR-LOK® doesn’t just lock, it “super locks” by preloading and locking in the force so hydraulics are no longer needed. The result is 100% preload to rated load at zero pressure.

Series Size Set Position* Output Force
70 8,000 lbs. (4 tons)
75 12,000 lbs. (6 tons)
100 26,000 lbs. (13 tons)
112 40,000 lbs. (20 tons)
150 60,000 lbs. (30 tons)
200 110,000 lbs. (55 tons)
300 210,000 lbs. (105 tons)

*Force ratings are at end of stroke only, based on assumed mold geometry. Ratings are for reference only. Actual performance will vary with application, setup and operating pressure.

KOR-LOK® Side-Action Systems have “User Friendly” Features

Multiple Ports – Rear ports standard

While only two hydraulic ports are used, we provide 5 SAE ports for maximum flexibility. All ports are machined in every unit. Using the two rear ports is quite popular.

Multiple sensor locations and guards standard

As sensor location may vary with adjusted preload position, multiple front and rear sensor locations are machined in every unit. Sensor guards are included to protect your investment.*

Direct Wire Relay or Proximity Sensors

Embedded dry contact sensors (XLT & XHT) verify “set” and “pull” positions without a voltage drop, making wiring multiple sensors simple and easy.** Low Profile Proximity Sensors (PNP) are also available.

Large Bore Cylinder Option

For deeply penetrating cores in high shrinkage materials, we are pleased to recommend our “LB” option. By adding a larger cylinder section to the standard fronts, pull force is greatly increased for improved core pull. Die casting materials and thermosets are typical material applications.

High Temperature Components/Metal Wipers

Flourocarbon seals (VI), Metal Wipers (MW), and High Temperature Sensors (XHT) provide the enhanced operating range for demanding environments to near 400˚F.

SWITCHMAX® CONNECTIVITY – SENSOR TO PRESS “PLUG AND PLAY” INTEGRATION

PFA’s new SWITCHMAX® components integrate multiple KOR-LOK® Side-Action sensors and other slide sensors into single set and pull inputs to the press with Operator side LED indication. System splitters also provide cross checking of mechanical switches to stop the press if sensors stop cycling as expected. The system can also be used with any mechanical dry contact/relay type sensors (SPDT FORM C) and with solid state sourcing style sensors, such as PFA’s PNP low profile sensor or others.

* Due to its small size, the 75 series does not have guards.
** For crash condition cores, we recommend an additional redundant sensor on the core itself to verify core retraction in the event of core to KOR-LOK® separation or false sensor reading if damaged or contaminated.

Multiple Sensor Integration with SWITCHMAX® Sensor Connectivity

Integrated SWITCHMAX connectivity available

Eliminate wiring schematics and troubleshooting problems on all molds.

SWITCHMAX® WITH PFA KOR-LOK® SIDE-ACTION SYSTEMS:

PFA’s new SWITCHMAX® components integrate multiple KOR-LOK® unit sensors and other slide sensors into single set and pull inputs to the press. When used with KOR-LOK® XLT or XHT sensors and other Single Pole Double Throw (SPDT) switches, the system provides cross checking of proper sensor position, as well.

SWITCHMAX® WITH OTHER MECHANICAL SWITCHES:

Integrate almost ANY mechanical relay/dry contact switches (plunger, rocker, PFA mechanical, relay) from multiple cores to an operator side interface for simple one input connection to the press. Full “plug and play” basic operation – NO programming or dip switching required.

SWITCHMAX® WITH 3 WIRE DC PROXIMITY SENSORS AND AC POWER CONTROLS:

SWITCHMAX® is also available in versions to integrate PFA’s new Low Profile Sensor (PNP) and other 3 wire PNP style switch sensors. For AC applications, the addition of the SWITCHMAX® AC Power Adaptor allows connection to machine controls operating with AC inputs. Power Adaptors are also available for Ø Volt Input Injection Molding machines.

Application Ideas & Recommendations

Performance Ratings

KOR-LOK® load ratings are empirically derived from a range of typical application geometries and mold behaviors. Ratings should be used only with calculations using maximum pressure and projected core area, as they already take into account some limits on preload adjustment and mold geometry, as well as cavity pressure drops, action geometry, typical core lengths, etc.

Preload ratings apply to a well secured stiff mold geometry with a core stroke of 5” or less, core lengths 5” or less, and core areas equal to or greater than core projected area. Basically, the load ratings apply to typical applications where mounting is relatively close to the part. For longer cores, or poor mounting support, it is highly recommended that the next larger unit be considered.

As discussed in the Overview section Tab, a “Preload Force Design” produces a large output force against a fixed stop.  When the preload force (PF or K) is applied to the stops, a stop force (SF) reaction force is generated equal to the preload force.   If the injection force Fi is less than the preload force, there will always be force on the stops and no movement of the core.

PFA application specialists are available to discuss recommendations, based on your particular application and their experience. While form, fit, and function for any particular application is the responsibility of the customer, following PFA recommended sizing has shown to be the best way to ensure optimal success.

Selecting Series Size

Set Force:  Force on the slide core due to injection (Fi) is a function of the nozzle injection pressure (P) and the core exposed surface area projected along the axis of movement (Ap).

Fi = Ap x P

For fully exposed cores, the projected area is best visualized by thinking of slicing the core perpendicular to the direction of movement and measuring the resulting region. In the figure below, the area exposed to plastic (blue surface) is projected along the core axis onto a perpendicular plane (green surface area). Shutoff areas may be included or exclude from the calculations for various reasons.  Inclusion is often done to accommodate potential flash situations.  Large areas may be pocketed to provide empty space for flash conditions and core protection.

Cylinder with Projected Area  Hydraulic Cylinder Sizing

CAD system methods to calculate projected area are online – Click here to see the SOLIDWORKS – Surface Area Projection YouTube Go Engineer video for an example. Selecting the object surfaces, removing cutouts, and projecting onto a plane is demonstrated.

Injection pressure (P) for sizing calculations is the peak pressure at the nozzle during the injection cycle, and is a function of the injection screw piston area and ram pressure. Typical Injection nozzle pressures are approximately 10 times the hydraulic ram pressure shown on the molding machine. Easy flow plastics typically run at 800 psi hydraulic x 10 = 8,000 psi, while high temperature plastics or glass fill plastic applications may require 20,000 psi or more. Part geometries and minimum wall thickness strongly affect the required processing pressures and thus have a major impact on the series selection.

While it is possible that some pressure drop will occur in the cavity and pressure at the core may be less than nozzle pressure, it is often as likely that peak pressure will increase due to processing demands such as thin walled sections. Due to challenges in predicting cavity pressure and process changes to operating parameters post build, peak nozzle injection pressure is preferred for sizing calculations.

For assistance in calculating areas and forces for simple geometries or provided projected areas, please try our CORE FORCE CALCULATOR page.  A recommendation of KOR-LOK size will be provide.  It is recommended to contact PFA for a complete review as other application issues may impact sizing selection.

Pull Force:  After injection, the plastic part cools and may shrink around the core, developing friction that resists movement.  Calculating the resisting force Fr is more challenging and seems to be highly dependent on plastic material type and amount of cooling. It may be helpful to consider other molds with similar materials and penetrations and then determine workable pull forces.

Cylinders are chosen with cylinder forces greater than Injection forces or friction forces.  To prevent core movement during injection, the KOR-LOK preload extend force (K) must exceed the injection force (Fi).  To ensure core pull, the cylinder retract force (Cr) must exceed the resistance force (Fr).

K >> Fi     and    Cr >> Fr

For more information on how to determine cylinder forces (with charts) for various pressures and bore sizes please consult our CYLINDER FORCES page.

For a free application review please contact PFA, providing complete details, such as Core Projected Area, Core Diameter, Core Length, Stroke, Maximum Injection Pressure, Hydraulic Pressure, Material Type, and 3D Drawings of the core/mold arrangement, if possible.

Stroke to Include Adjustment

Stroke is primarily determined by the need to clear the core from the part, but practical efforts should be made to simplify overall product selection, mounting, and adjustment. Use of PFA downloadable CAD files is recommended, as CAD files provide details on the historically standard relay style sensors (now – XLT), strokes to 20 inches, LB bores, and the new High Temperature (-XHT) and Low Profile (-PNP) sensors, where many dimensions vary.

During setup, the cylinder is advanced causing cylinder stroke to be reduced by approximately .100”. Therefore, approximately 1/8” should be added to the retract amount needed to clear the part. Also ensure the cylinder is allowed to stroke fully for proper sensor operation.

KOR-LOK Mounting Diagram

Mounting Options – Bolt C’bore & Parting Line

Use of a mounting flange (RFC/SFC), jam nut (JN), alignment screw (AS), and alignment coupler (AC) [or T-Slot in the core] is standard on nearly every application to allow for proper alignment and preload adjustment of the main unit cylinder.

mounting-diagram-2Mounting distance from the core must account for the variable E dimension for non-integer stroke units. Use of integer stroke units is recommended for ease of design and off the shelf delivery. Flanges can be mounted with counter bored mounting bolts in locations desired by the customer, as long as there is equal coverage around the KOR-LOK®.

It is recommended that bolts be located outside the diameter of the jam nut for ease of removal and that flanges be spaced off from the mold to allow KL unit to thread through the flange past the flange face approximately 1/8” (or the mold relieved to allow for preload adjustment).

If mounting the unit on the parting line, use a block to capture one side of the flange in place of the mounting bolts. Call PFA for mounting ideas and information regarding proper mold sequencing for flange capture applications.

High Temperature Seals, Wipers, and Sensor Options

Front (set-locked-preloaded) and rear (pull) sensors (switches) and cables are included with each
KOR-LOK® main unit. Use of the sensors during setup and adjustment assists in verification of proper operation (see pages 14-15). The SWITCHMAX® junction box and cabling is recommended for multiple core applications, crash condition cores, or when cross checking of sensor positions or LED indication is desirable.

High Temperature Seals (VI), Metal Rod Wiper (MW) and High Temperature Relay Sensor (XHT) options are available for very high temperature plastic and die casting environments. For some applications, insulation between the flange and the mold (or flange cooling) may be needed.

Driving Wedges and Racks

Because the KOR-LOK® generates preload though an internal wedge style force intensifier, wedge applications and rack and pinion designs often limit the ability for the main unit to preload the core face.

For wedge applications, preloading the prime mover is often enough to hold the core in position for successful part production, however the core face itself is often not substantially preloaded. As these applications are often difficult in concept, use of the KOR-LOK® system can provide substantial advantages, however, we recommend careful PFA staff review.

Rack and Pinion applications typically have special challenges with a large preload force applied to the gear teeth. Typically the racks are not sized large enough to handle the forces needed to transmit the preload to the core. Careful review is recommended to determine feasibility.

PFA Application Review

Making the difficult easy and successful is one of the great advantages of the KOR-LOK® Side-Action System and we are proud to back that up with the best in service and support. For best results, please have a PFA application specialist review your selection criteria to help ensure nothing was missed. When it looks like a challenge, our application specialists are on your side to find a way to make the difficult easier. For the most detailed sizing information, product specifications, design suggestions, CAD files, and new product updates, call your application specialist or visit us at www.pfa-inc.com.

All PFA KOR-LOK®, DIE-LOK™ and Switchmax® application and use recommendations are advisory only. KL/DL preload force ratings are geometry dependent and based on PFA recommended sizing methods. Process variations may affect actual performance. PFA recommends use of PFA’s Switchmax® cross connected sensor checking and independent 2nd pull sensor (redundant) “core pulled” sensing on molds where opening with cores set could damage the mold. False readings in the event of single sensor failure, cylinder contamination, core to cylinder separation, attachment failure, etc. may occur. PFA is not responsible for situations arising from false sensor readings, product failure, misuse, or abuse – proper form, fit and function are the responsibility of the customer. PFA “Terms of Sale” apply.

These procedures have been written in an effort to address as many configurations as possible. If your particular application requires set up procedures that are not covered in the preceding documentation, please contact PFA at (262) 250-4410 for assistance.

Dimensional Information

(All dimensions nominal and in inches)

KOR-LOK Series Size 70, 75, 100, 112, 150, 200, 300
KL200 3D Snap Side Angle View
KOR-LOK Series Size 112-LB, 150-LB, 200-LB
KL200 3D Snap LB Angle
Main Unit (KLH-_______-(stroke) – Options)
Series Size Output Intensifier Force***
(Preload)
Min. Pressure for Full Preload Pressure to Maintain Preload Bore Dia.
Rod Dia.
Extend Force @1500psi Retract Force @1500psi A M E** R
V
I C**
70 8,000 lbs. 1,500 psi 0 psi 1.00”
0.75”
1,175 lbf 510 lbf 2 1/8”-16 0.75” 0.50” 1.88”
3/8”-24 5.74”
75 12,000 lbs. 1,500 psi 0 psi 1.25”
0.75”
1,825 lbf 1,125 lbf 2 3/4”-16 0.75” 0.50” 2.25”
3/8”-24 6.22”
100 26,000 lbs. 1,500 psi 0 psi 1.75”
1.00”
3,600 lbf 2,425 lbf 3 1/2”-16 1.00” 0.50” 2.75”
1/2”-20 7.26”
112 40,000 lbs. 1,500 psi 0 psi 1.75”
1.125”
3,600 lbf 2,100 lbf 3 1/2”-16 1.00” 0.50” 2.75”
5/8”-18 7.26”
112-LB* 40,000 lbs. 1,500 psi 0 psi 3.00”
1.125”
10,600 lbf 9,100 lbf 3 1/2”-16 1.00” 0.50” 2.75”
5.14”
5/8”-18 8.59”
150 60,000 lbs. 1,500 psi 0 psi 2.00”
1.50”
4,700 lbf 2,050 lbf 4”-16 1.25” 0.75” 3.38”
7/8”-16 8.93”
150-LB* 60,000 lbs. 1,500 psi 0 psi 4.00”
1.50”
18,800 lbf 16,175 lbf 4”-16 1.25” 0.75” 3.38”
7.04”
7/8”-16 10.75”
200 110,000 lbs. 1,500 psi 0 psi 3.00”
2.00”
10,600 lbf 5,850 lbf 5”-12 1.75” 1.00” 3.75”
1 1/4”-12 9.98”
200-LB* 110,000 lbs. 1,500 psi 0 psi 5.50”
2.00”
35,600 lbf 30,900 lbf 5”-12 1.75” 1.00” 3.75”
8.03”
1 1/4”-12 12.49”
300 210,000 lbs. 1,500 psi 0 psi 4.00”
3.00”
18,800 lbf 8,225 lbf 6 3/4”-8 2.00” 1.25” 5.00”
1 3/4”-12 12.08”
Outer Dimensions, Ports and Sensor Options
Series Size Output Intensifier Force*** (Preload) Body Dia. N n(SAE) PNP Low Profile Prox Original XLT Relay Low Temp XHT Relay High Temp
a u O** P** Q** O** P** Q** O** P** Q**
70 8,000 lbs. 2.38 #2
#3
4.4” 3.9” 0.8” 7.4” 6.5” 2.3” 8.4” 7.7” 2.8”
75 12,000 lbs. 3.00 #4
#4
4.8” 4.0” 0.5” 8.0” 7.3” 2.3” 9.3” 7.9” 2.7”
100 26,000 lbs. 4.00 #4
#4
5.6” 5.1” 0.6” 8.6” 7.9” 2.3” 9.9” 9.2” 2.9”
112 40,000 lbs. 4.00 #4
#4
5.6” 5.1” 0.6” 8.6” 7.9” 2.5” 9.9” 9.2” 2.9”
112-LB* 40,000 lbs. 4.00 6.00 #4
#6
5.6” 6.9” 0.9” 8.6” 9.1” 2.5” 9.9” 10.4” 3.1”
150 60,000 lbs. 4.50 #6
#6
6.1” 5.3” 0.9” 9.1” 8.1” 2.5” 10.4” 9.4” 3.1”
150-LB* 60,000 lbs. 4.50 7.50 #6
#8
6.1” 8.1” 0.9” 9.1” 10.3” 2.5” 10.4” 11.6” 3.1”
200 110,000 lbs. 6.00 #6
#6
7.0” 6.9” 0.9” 10.1” 9.1” 2.5” 11.4” 10.4” 3.1”
200-LB* 110,000 lbs. 6.00 9.00 #6
#8
7.0” 9.5” 0.9” 10.1” 11.7” 2.5” 11.4” 13.0” 3.1”
300 210,000 lbs. 7.50 #8
#8
8.4” 8.1” 0.9” 11.5” 10.3” 2.5” 12.8” 11.6” 3.1”

*LB Option – Large Bore units have all the same accessories as standard units.  Use -LB in the main unit order code only.

** Use of PFA downloadable CAD files is recommended, as CAD files provide details on the historically standard off the shelf cylinders with 1”-5” strokes and relay style sensors (now – XLT), as well as other stroke units, LB bores, and the new High Temperature (-XHT) and Low Profile (-PNP) sensors. 70 and 75 series have no guards. Guard chart dimensions O and P show swing arc clearance diameter during adjustment. Alternate front sensor location included in the event that interference occurs at final adjustment position.  Q is for alternate rear sensor position, if used in place of the rear side location. Dimensions for XLT sensors reflect the longest sensor from multiple suppliers.

***Output Mechanical Intensifier Ratings are for end of stroke (general reference only).  Actual performance is dependent upon application geometry, setup and adjustment.  Mid stroke and pull forces are less.  Minimum operating pressure is 1,500psi to set with full rated preload.  After locking, preload is maintained with 0 psi, hydraulics are NOT required to maintain lock.

Alignment Couplers and Alignment Screws
Alignment Screw to Slot Interface comparisons
Alignment Coupler [KL-_______-AC]
Alignment Screw [KL-_______-AS]
Series Size A AA a aa C CC E EE
70 .452 0.472 .236 0.216 0.570 0.530 0.340 0.300
75 .452 0.472 .236 0.216 0.728 0.688 0.434 0.394
100 .485 0.515 .260 0.240 0.915 0.875 0.590 0.550
112 .485 0.515 .260 0.240 1.025 0.985 0.670 0.630
150 .750 0.790 .415 0.395 1.290 1.250 0.750 0.710
200 1.450 1.500 .770 0.750 1.830 1.750 1.220 1.180
300 1.900 1.970 1.004 0.985 2.640 2.560 1.615 1.575
Jam Nut dimensions
KL200 3D Square and Circular
Jam Nut [KL-______-JN]
Series Size f
k
G g H e
70 0.11” 2.75” 2 1/8”-16 0.38” 0.25
75 0.13” 3.50” 2 3/4”-16 0.50” 0.31
100 0.13” 4.50” 3 1/2”-16 0.63” 0.31
112 0.13” 4.50” 3 1/2”-16 0.63” 0.31
150 0.19” 5.25” 4”-16 0.75” 0.38
200 0.25” 6.50” 5”-12 0.88” 0.50
300 0.31” 8.75” 6 3/4”-8” 1.00” 0.63
Flange and Wrench Dimensions
Flange (Round or Square) [KL-_______-RFC or -SFC]
Recommended Bolt Circle with C’Bore SHCS
Series Size d D* F* Recommended
Bolt Size/Quantity
C’Bore
Bolt Circle
Depth Dia. Bolt Circle
No C’Bore
70 2 1/8”-16 4.5” .75” 3/8” x 4 2.80”-3.90” .40” .59” 3.35”-3.90”
75 2 3/4”-16 6.0” 1.00” 1/2” x 6 3.75”-5.00” .56” .81” 4.50”-5.25”
100 3 1/2”-16 7.2” 1.50” 5/8” x 6 4.75”-6.00” .69” 1.00” 5.75”-6.25”
112 3 1/2”-16 7.2” 1.50” 5/8” x 6 4.75”-6.00” .69” 1.00” 5.75”-6.25”
150 4”-16 8.0” 1.50” 5/8” x 6 5.25”-6.75” .69” 1.00” 6.50”-7.00”
200 5”-12 10.0” 2.00” 3/4” x 6 6.50”-8.50” .81” 1.19” 8.00”-8.75”
300 6 3/4”-8 14.0” 2.50” 1” x 12 8.75”-12.25 1.06” 1.56” 10.50”-12.50”

*Flanges have no pre-drilled bolt holes for maximum design flexibility. Grade 8 bolts recommended. Since flange edges are flame cut and faces are machined flat, allow +.200/-.000” for edges and +.000/-.300” for faces (pilot off center thread only).

**Alignment screw has a convex face to promote proper centering of the axial load, and is designed to create a loose fit, with the mating coupler or appropriately designed T-Slot, to help accommodate misalignment.

Wrench[KL-_______-SWJ]
Series Size X W Y
70 8.0 3.8 .4
75 9.0 5.0 .5
100 10.0 6.5 .5
112 10.0 6.5 .5
150 11.0 7.5 .5
200 12.0 9.0 .5
300 15.0 12.0 .5
Switchmax (Optional)
New Switchmax 2020
Switchmax Junction Box
Switchmax General Splitter Cable Layout

Identify Your Part Number

Main Unit and Accessories Ordered Separately

KOR-LOK Main Locking Cylinder Part number specification
KOR-LOK Accessories for Locking Cylinder Part number specification
PFA SWITCHMAX LED cable system part number specification
Example:

Main unit and mounting accessory example for a large bore 150 series. Note that LB is only used for the main unit as 150-LB and 150 units have common accessories:

Quantity Part Number
1 KLH-150-LB-XLT-3.00 Main Unit
1 KL-150-SFC Square Flange
1 KL-150-JN Jam Nut
1 KL-150-AS Alignment Screw
1 KL-150-AC Alignment Coupler
1 KL-150-SWJ Spanner Wrench
1 SM-KL-DCPKG-1S Switchmax® Wiring
PFA SWITCHMAX Relay Sensor and system test box

To test sensors of complete installations a Switchmax® test box is available. Part No. SM-RTB-1A


part-solutionsClick here for CAD MODELS by PARTsolutions.  CAD Models are available in over 150 native and neutral CAD and graphic formats, versions and revisions. That means no matter what system your using, you can download KOR-LOK Models in your native format, which can be easily imported with all geometric integrity and meta data intact.

“PFA has a very sophisticated and diverse customer base, who are using a wide variety CAD systems and formats. CADENAS PARTsolutions provides the formats they need and keeps them up-to-date, so the PFA online tools can deliver the best possible output now and into the future.”

– Doug Korneffel, CTO CADENAS PARTsolutions

Download 3D Model CAD Files in Any Format

PFA provides FREE APPLICATION REVIEW SUPPORT and parametric 3D CAD models in partnership with CADENAS Part Solutions.  Please review the below recommendations and instructions.

Scroll to the bottom to input information and download CAD files.

Apple users – please note that Safari may not work for accessing CAD files. Using Chrome or Firefox is recommended, as the CAD interface performs best with these browsers.

Blocked Domains – All “free-mail” domains such as Gmail, Yahoo, Hotmail, etc. are blocked due to SPAM related issues and cannot be used to receive CAD file downloads. Please use a corporate email account when logging into the configurator.

New user registration, updating registration, and password reset may result in the system opening a new browser tab. After completing login or password reset, a new page may load with generic information. Please close the new tab and proceed by clicking “OK” on the original tab behind it. If the page looks unfamiliar or confusing, please reload the page and reenter the product parameters. We are working to improve the new user experience with CADENAS and apologize for any confusion. Please contact PFA for assistance.

FREE Application Review Support

Our Applications Specialists have reviewed thousands of applications. Let our experience work for you! Please contact us early in the design process or email your concept to discuss recommended options.  We can open 2D and 3D files in a wide variety of formats. Typically we will not have a problem opening whatever file format you send, however, STEP files seem to be the most versatile.

Application Specialists will provide recommendations for size, orientation, shutoffs, stops, etc., and point out any possible limitations of the proposed design affecting proper core preloading.  As consulted experts in retrofit and new core applications, we pride ourselves as a resource to those in search of zero flash performance.  While mold designers that follow our recommendations typically produce highly successful molds, it is our goal to train users on the evaluation process and provide guidance.   We want designers to have the understanding to make product selection decisions, having covered all the parameters important to the application.  See Applications/Sizing for ideas on how we calculate forces and support unique mounting configurations.

Entering 3D Model Information  – Download Instructions:

Parametric 3D model CAD Files are available in about 50 various formats, by partnering with CADENAS Part Solutions.  The download file for the KOR-LOK (preloading hydraulic locking cylinder) will also include chosen accessories.  In the table near the bottom of the page is a parameter menu (left side) and image pane for the model (right side).  Selecting parameters on the left will generate the correct model preview and CAD file for downloading.

For a better understanding of dimensions, see the Dimensional Information section.  For additional information on selecting CAD file options, help for specific CAD systems, or more details on how to use the configurator, please see help in the instructions below.

Selecting Product Part Number and Accessories Information – After reviewing the PFA sizing methods and recommendations, select the series size and all the options and accessories desired:

  • Series Size – this is the model size (70, 75, 100, 112, 150, 200, 300)
  • Large Bore Option (LB) – select large bore (LB) if a large pull force is desired.
  • Stroke – Available in 1/100th (.01) inch increments (example 2.75, 1.13, etc)
  • Stroke Position – provides the model with the rod extended or retracted.
  • Sensor Style (XLT, XHT, PNP) – see Dimensional Information or Installation/sensor information page for details.
  • Metal Wiper Option (MW)– Typically for Die Casting
  • High Temp Seals Option (VI) – For applications where the mounting or core interface would exceed 200 F
  • Accessories – Alignment Screw (AS) – Select if Male rod end coupling is desired (recommended)
  • Accessories – Alignment Coupler (AC) – This is the female (T-Slot) piece for the rod end – Use if T slot is not in the core.
  • Accessories – Flanges – Choose either the Round Flange (RFC) or Square Flange (SFC). Both allow bolt counter bores.
  • Accessories – Jam Nut (JN) – Choose this as all applications need the Jam Nut (required)
  • Accessories – Spanner Wrench (SWJ) – Used to tighten and loosen Jam Nut (recommended).
  • Front Sensor Location – Standard is in line with the rear side sensor. The alternate location is 180 degrees.
  • Rear Sensor Location – Standard is out the side of the rear head.  The alternate location is out the back of the rear head.
    Please note that front and rear sensors are always included. All four sensor ports (2 front/lock and 2 rear/pull) and all five hydraulic ports (set – 2 ports and pull – 3 ports) are standard, with the unused ports plugged for future use if needed.  Selection of location in the CAD file creator simply provides a location for the model and does not affect the part number ordered.  Please review the product dimensional pages or contact PFA for details.

Preview Tab and Update  – Select “Update Preview” in the center of the image area.  The model will be created and can be rotated by clicking and holding while moving the mouse as is typical in many CAD systems.  The small menu on the upper left and various action buttons on the bottom can be used to gain various impressions of the model and some dimensions. New accessories may be selected and new models generated. Selecting the Dimensions Tab in the image window will bring up 2D layouts.  The letters on the drawings reference dimensions shown on the left below the selectable options.

CAD Download Tab – Click on the CAD Download Tab on the upper left of the window and then the Generate CAD button. If you are a returning customer and remember passwords, login to continue or the system may log you in automatically.  Click on the Generate CAD button to load the current configuration after login.  The system will remember your CAD model file type, but if you are a new user or have not downloaded files recently, it may prompt for details on your CAD system or require accepting new user terms (seen below).  Select the “Edit CAD Formats” link on the bottom right next to your email or the small menu box next to the Generate CAD button to change file formats.

New Users/Forgot Password/Free Email Domains – New user registration, updating registration, and password reset may result in the system opening a new browser tab.  After completing login or password reset, a new page may load with generic information.  Please close the new tab and proceed by clicking “OK” on the original tab behind it. If the page looks unfamiliar or confusing, please reload the page and reenter the product parameters.  We are working to improve the new user experience with CADENAS and apologize for any confusion.  Please contact PFA for assistance.

Reminder, all “free-mail” domains such as Gmail, Yahoo, Hotmail, etc. are blocked due to SPAM related issues and cannot be used to receive CAD file downloads.  Please use a corporate email account when logging into the configurator.

CAD File Download –   After selecting the correct file type and selecting Generate CAD, an image of a cylinder and part number file name should appear in the center of the window.  Please allow time for the file to generate.  Select Information to view the file type information, Download, or Delete to update parameters.  (See Help below for additional information on special file types to determine if additional advice, downloads, or support is needed for using the files).

Help – Most files are simple and downloads easy to import, however for those interested in advanced features or for those using CATIA (CATIA Support) and SolidWorks (SolidWorks Support), viewing the help files is recommended to ensure smooth and successful results.  Configurator Help reviews items that affect the ability to operate the online viewer and what file types are available.  Typically customers have a smooth experience, however, the configurator does require that JAVA (Chrome and Firefox) is installed and enabled and will prompt for the installation of Active X if not installed.  Different browsers may require other plug-ins, such as Chrome (Chrome Plug-In).  Please try these recommended solutions on the CADENAS Part Solutions Main Support Page or call PFA for assistance.

Free Review Consultation and Online Quotes

Free Mold Applicaton Review – After dropping in the KOR-LOK 3D model, please email the preliminary design to our application specialists for a free review.

Online quotes are also available for immediate access to pricing.  Prior to ordering, PFA recommends taking advantage of the free application review and consultation with an application specialist to cover any unique requirements.

Note for Safari users:  if you’re seeing “No Third-Party Cookies supported” below, either uncheck the “Prevent cross-site tracking” and “Block all cookies” boxes under your Safari preferences – Privacy or use the Firefox or Chrome browsers.

Get An Online Quote

Please click here to be direct to the online quotes page for quotes in real time.

Installation / Maintenance

Read the following instructions carefully, paying close attention to the sections that pertain to the model you have purchased. If you have any questions or need technical assistance, please call our support staff at (262) 250-4410.

Installation Video

Preload Adjustment Video

Installation Guide

Adjustment Procedure for Currently Installed Unit
  1. Retract cylinder and loosen Jam Nut.
  2. Unscrew cylinder from flange a few turns (counter-clockwise) – allows slide to travel fully without touching stops or shutoff.
  3. Connect hydraulics and power the cylinder forward to the extended/locked position – core should not seal off or hit stops at this time.
  4. Critical Step!!! Disconnect hydraulics and VENT the cylinder to atmosphere by removing one (1) extend and one (1) retract port plug.
  5. Thread the cylinder into the flange (clockwise), until the core seats and the cylinder physically stops turning. Note: you should not be able to turn the cylinder any further by hand – it should be solidly stopped.
  6. Reinstall the port plugs, reconnect the hydraulics, and retract the cylinder.
  7. Critical Step!!! Rotate the cylinder further into the flange (clockwise) the additional amount shown on the chart below to set the preload:
    Series Pre-load
    70 1/6 turn
    75 1/6 turn
    100 1/6 turn
    112 1/6 turn
    150 1/3 turn
    200 1/4 turn
    300 1/8 turn
  8. Tighten the Jam Nut.
  9. Setup is now complete. Unit will make good parts for most applications. If more output force is required (core is flashing slightly), rotate the cylinder into the flange further (clockwise) in small increments (approximately 1/16 turn) until the flash goes away.
Procedure for Installing a New Unit
Tips regarding accessories
  • ALIGNMENT SCREW (AS) AND COUPLER (AC): If you require Alignment Screws and/or Couplers install these first. Install the Alignment Coupler (T slot) in the core and the Alignment Screw (knob) into the piston rod until fully seated. A thread locking compound may be utilized if desired.
  • MOUNTING FLANGES (SFC or RFC): The Mounting Flange is provided without pre-drilled mounting holes. (See recommendations) Ensure threaded hole is centered relative to the core attachment point and torque flange bolts to appropriate specifications.
  • JAM NUT (JN): Install the Jam Nut onto the KOR-LOK® unit with the beveled edge toward mold. Thread the Jam Nut most of the way on.
  • Spanner Wrench (SWJ): A wrench can be purchased for easier tightening and loosening of the Jam Nut. Many customers use a brass rod and hammer, but this method typically causes damage to the Jam Nut slots over time.
Preparation for Installation of the Main Unit – On the Bench
  1. Remove port plugs from one extend and retract port. There are three options for the retract port (A, B and C) and two options for the extend port (D and E) as shown in Figure 1.
    CAUTION! Fluid may eject from retract port as rod extends. Observe proper safety precautions.
  2. Apply a pressure source (minimum of 80 psi pneumatic or hydraulic) to the open extend port (D or E) until the unit is fully extended/locked.
Installation of Main Unit
  1. With the unit extended/locked, and vented (port plugs removed on one (1) extend and one (1) retract port), connect the core slide to the rod and thread unit into the flange a few turns.
    NOTE: For long term ease of adjustment, application of anti-seize or other thread lubricant may be desired.
  2. Thread unit inward (clockwise) until the core is fully seated and cannot be turned in by hand – solidly stopped.
  3. Ensure proper thread engagement of the cylinder and flange – equivalent to the thickness of the flange.
  4. Ensure that there is space beyond flange for unit to thread through for adjustment. See required flange thickness for your model size (refer to “Recommended Accessories” section of catalog).
  5. Place mark on flange and unit body to mark position location for reference.
  6. Reinstall the port plugs, reconnect the hydraulics, and retract the cylinder.
  7. Thread the unit Inward (clockwise) the recommended pre-load amount in the chart below.
    Series Pre-load
    70 1/6 turn
    75 1/6 turn
    100 1/6 turn
    112 1/6 turn
    150 1/3 turn
    200 1/4 turn
    300 1/8 turn
  8. Tighten Jam Nut.
  9. Connect sensors using appropriate procedures for the style utilized in your application. Documentation is provided separately.
  10. Extend unit HYDRAULICALLY (1500 psi minimum) and verify lock sensor activates (turns on) ensuring unit locks as expected. Failure to lock is one indication of an adjustment problem.
  11. After extending and locking, the preload stretches the large threads which may cause loosening of the Jam Nut. Re-tighten the jam nut, if desired.
    (Note: If the jam nut is tightened while the unit is preloaded, future loosening of the jam nut will require extending and preloading the unit).
  12. Cycle unit hydraulically several times and verify complete operation.
  13. Test Mold during injection and note part quality.
    If flash occurs, additional preload adjustments (1/16 turn increments clockwise) may be needed at normal operating temperature to achieve the desired final adjustment. If unit does not operate as intended, call PFA for assistance. Applications vary widely and this procedure may not exactly cover all geometries. 24/7 technical phone assistance is generally available.

XLT and XHT PFA Dry Contact/Relay Sensor Wiring Instructions

Standard EE 70194/CT70300 (assembly) and High Temperature EE70199/CT705XX (Assemblies)

Fig. 1 - Single Sensor Wiring

Fig. 1 – Single Sensor Wiring

 

Fig. 2 - Multiple Sensor Wiring (Series)

Fig. 2 – Multiple Sensor Wiring (Series)

PFA Relay-style sensors (CT70300 assembly CT70520/21/22… High Temperature Assembly) function as a true dry contact switch. In normal usage, when the target comes “in range” of the sensor, the magnet inside the switch closes a contact to complete the circuit.

CT70300 Assembly Specifications
Part No. on Sensor EE70194 / EE70194B
Cylinder Designation -XLT
Contact Type SPDT (Single-Pole, Double Throw)
Contact Rating 2 Amps @ 12OVAC
1 Amp @ 240VAC
1 Amp @ 24VDC
Temperature -40˚F (-40˚C) to 257˚F (125˚C)
Pressure 3000 psi max.
Install Torque Max. 50 in-lbs. max.
CT70520/21/22…Assembly Specifications
Part No. on Sensor 72-16222-F4 / EE70199
Cylinder Designation -XHT
Contact Type SPDT (Single-Pole, Double Throw)
Contact Rating 4 Amps @ 12OVAC
2 Amp @ 240VAC
3 Amp @ 24VDC
Temperature -40˚F (-40˚C) to 400˚F (204˚C)
Pressure 3000 psi max.
Install Torque Max. 50 in-lbs. max.
XLT Sensor

Relay-style switches offer many benefits to the user. They have no voltage drop when closed nor do they have leakage current when open. In most applications the Normally Open (N/O) connection is used so that when the cores reach set or pull, the relay contacts close to give that indication to the press. In most cases, the Normally Closed (N/C) connection is not used, but is available for use as part of PFA’s SWITCHMAX® Mold Wiring solution.

Connection between the KOR-LOK® Side-Action System and the press, is as simple as connecting two set sensor wires and two pull sensor wires to the two pair of machine control wires. The order of connection for each pair is not important.

kor-lok-wiring-photo

Multiple set sensors may be wired in series to provide a single set indication to the press. Similarly, the pull wires may be connected in series. For situations where a core or other part of the mold may be damaged if opened with cores set, it is recommended that a redundant sensor be placed on the core itself and wired in series with the main unit sensors to ensure the core is retracted prior to mold opening.

PFA’s SWITCHMAX® Mold Wiring solution is also available to provide cross checking of sensors to verify proper sequencing and provide operator side LED light indication. For additional information on SWITCHMAX®, please view the information online at www.pfa-inc.com.

PNP Low Profile PFA Proximity Sensor Wiring Instructions

EE70600/CT70600 Assembly

 

low-profile-sensor

 

kor-lok-low-profile-sensor-2

PFA Low Profile -PNP sensors (EE 70600/CT 70600 assembly with seal) function as typical high pressure proximity sensor, with a solid state device that senses the metal target of the lock or piston and outputs the input voltage (24VDC) to the machine control.

CT70600 Assembly Specifications
Part No. on Sensor: PFA-EE70600
Cylinder Designation: -PNP
Contact Type: Solid State PNP/NO
Contact Rating: 100 mAmps @ 24VDC
Supply Voltage: 10-30 VDC
Voltage Drop: ≤2.5 VDC
Temperature: -13˚F (-25˚C) to 175˚F (80˚C)
Install Torque Max.: 50 in-lbs. max.

Low Profile PNP sensors offer benefits to the user when fitting The KOR-LOK unit into demandingly small applications or when Integrating with other actuators using similar PNP sensor logic. PFA’s PNP option has a low voltage drop, typically allowing multiple sensors to be connected together to facilitate a single input to the machine control. Sensor integration is easily accomplished with PFA’s SWITCHMAX® connectivity solution with PNP designated splitter cables.

kor-lok-low-profile-photo

In a generic application the Normally Open Sensor is paired with an individual cable to provide power and route the signal. To use the sensors individually, Power +24VDC (Brown wire) and Neutral 0 VDC (Blue wire) is required, as well as some method of integrating the sensor signal (Black wire) to the press. Various schemes are used to accomplish this task for molds with multiple cylinders, however, PFA recommends SWITCHMAX® to provide a plug and play serial connection of sensors into single inputs for set and pull, while also providing operator side indication and troubleshooting capability.

While proper indication is expected, PFA cautions that for situations where a core or other part of the mold may be damaged if opened with cores set, it is recommended that a redundant sensor be placed on the core itself and wired in series with the main unit sensors to ensure the core is retracted prior to mold opening.

For details on SWITCHMAX® options, please view the information online at www.pfa-inc.com.

PNP Low Profile Sensor for PFA Hydraulic Locking Cylinders on Injection Molds - Main view

Sensor Replacement

Read instructions completely before beginning work. If you have questions or need technical assistance, please contact PFA for support.

WARNING! The sensor is not solid metal! Torque values are very low – in-lb not ft-lb!

The XLT Relay Sensor Assembly consists of the Sensor Body (EE70194), O-Ring Seal (2-013), and purple Loctite® (#545) thread compound. The Loctite® is provided to give the sensor resistance to loosening/leakage under normal use.

The XHT (High Temperature) Relay Sensor Assembly consists of the Sensor Body (EE70199), High Temp (VI) O-Ring Seals, Adaptor Body (LR08100) and purple Loctite® thread compound.

The PNP (Low Profile) Solid State Sensor Assembly consists of the Sensor Body (EE70600), O-Ring Seal (2-013) and purple Loctite® thread compound.

Preparation for Sensor Replacement

Ensure all hydraulic pressure is removed from the unit. Hoses may then be disconnected or the associated hydraulic system vented and secured to prevent pressurization of the KOR-LOK® Side-Action System Main Unit.

CAUTION! Fluid may eject from the sensor hole or ports under pressure or rod movement. Sensor is capable of handling Large Voltage and Current levels. Observe proper safety precautions.

Ensure the main unit is in a safe orientation so that the rod cannot move or apply a load on the cylinder, which might result in applied pressure to fluid still inside the unit.

Disconnect or secure power to the sensor from associated equipment.

Removal of Old Sensor

With pressure removed and vented and electrical power secured to the sensors, locate the front or rear sensor, as appropriate. Remove the cable from the sensor by unscrewing the retaining ring in a counterclockwise direction and unplugging the cable. For direct wire -XHT sensors, disconnect from power or controls.

Remove the sensor by rotating or unscrewing with a counterclockwise rotation on the hex nut connector (a 5/8” deep wall socket is recommended to avoid damage to the connector plug for XLT sensors). For PNP sensors, use a 5/8” or 16mm socket with cutout for cable.

Installation of New Sensor
(Recommended Preferred Method)

Inspect the sensor hole and surrounding sealing surface. Remove any debris from the surface, degrease threads, and ensure the surface is not damaged.

CAUTION! Sensor is designed to seal finger tight. Do not exceed 50 in-lbs (inch-pounds) of torque.

Degrease threads in housing and sensor. Ensure threads are clean and dry. If available, apply Loctite® Locquic® Primer T (7471) or equivalent to threads and wait until dry.

Add a small drop of purple Loctite® (#545) to the sensor threads and insert the new sensor in the hole turning clockwise. (Turn the sensor using fingers only until resistance of the o-ring seal is encountered – continue turning sensor clockwise against the seal resistance until the sensor seats on the sealing surface). The o-ring will seat with minimal torque and is fully seated by 30 in-lbs. At this level the sensor no longer turns freely.

Torque to 45 in-lbs (a 5/8” deep wall socket is recommended to avoid damage to the connector plug). EXCESSIVE TORQUE WILL DAMAGE THE SENSOR.

Connect cable and turn the connector retaining ring clockwise until play is removed or reconnect wire as appropriate.

Allow Loctite® to set for 5 minutes and reinstall KOR-LOK® unit in mold.

All PFA KOR-LOK®, DIE-LOK™ and Switchmax® application and use recommendations are advisory only. KL/DL preload force ratings are geometry dependent and based on PFA recommended sizing methods. Process variations may affect actual performance. PFA recommends use of PFA’s Switchmax® cross connected sensor checking and independent 2nd pull sensor (redundant) “core pulled” sensing on molds where opening with cores set could damage the mold. False readings in the event of single sensor failure, cylinder contamination, core to cylinder separation, attachment failure, etc. may occur. PFA is not responsible for situations arising from false sensor readings, product failure, misuse, or abuse – proper form, fit and function are the responsibility of the customer. PFA “Terms of Sale” apply.

These procedures have been written in an effort to address as many configurations as possible. If your particular application requires set up procedures that are not covered in the preceding documentation, please contact PFA at (262) 250-4410 for assistance.

Core Force Calculator

Please click here to be direct to the Core Force Calculator page for determining the force on the core due to injection pressure and the exposed core area.

Cylinder Extend and Retract Forces

The general formula for force (C) from a hydraulic cylinder is the differential area (D) multiplied by the hydraulic core pull circuit system machine pressure (H).

C = D x H

The term differential area is used to remind us to subtract rod area for retract calculations. The differential area (D) for extend (De) is the area of the cylinder bore De= 3.14xB2/4, where B is the bore diameter and determines the extend force Ce. The differential area for retract (Dr) is the “difference” in areas between the bore and rod D=3.14x(B2– R2)/4 and determines the retract force Cr.

To prevent core movement during injection, the cylinder extend force (Ce) (or K if using a preloading KOR-LOK) must exceed the injection force (Fi).  To ensure core pull, the cylinder retract force (Cr) must exceed the resistance force (Fr).

PFA KOR-LOK Side Action System are the type of hydraulic locking cylinder with a large preload force at the end of stroke and thus provide the critical forces needed to preload cores in place during injection.   This force is locked in and maintained at zero psi pressure.   Note that PFA Preloading Hydraulic Locking Cylinders with large output extend forces have an extend force (K) at end of stroke, but function as typical cylinders for retract with force (Cr). For success:

 K >> Fi     and    Cr >> Fr

Sizing a cylinder with preload force (K) greater than the calculated injection force (Fi) is necessary to prevent movement. Given the size advantages of the KOR-LOK cylinder, higher speeds, and locked in preload, selecting a KOR-LOK Side Action System with preload force (K) is recommended for injection molding applications.

Cylinder Selection

With the formulas mentioned earlier, the injection force (Fi) can be calculated and multiplied by a safety factor (SF) to determine the necessary cylinder force (Ce) or sized with preload force (K) for core set. Cylinder retract force (Cr) can then be evaluated for effectiveness relative to the estimated friction force (Fr) to pull the core from the pocket.

Calculating forces for a variety of cylinders and solving for minimum bore size is possible; however, using the chart below is often easier and provides some comparisons of relative size. Note the large preload forces from the KOR-LOK Side-Action System hydraulic locking cylinders (HLC) are six to ten times that of standard cylinders of the same bore diameter at 1500 psi hydraulic pressure.

Set Conditions
Extend Force in lbf @ listed hydraulic pressure psi
Cylinder Type Standard or
PFA HLC
Bore Dia.
(inches)
Diff. Area
(sq. inches)
HLC Preload
End of Stroke (lbf)
250 500 750 1000 1250 1500 2000 2500 3000
HLC KLH-70 1.000 0.785 8,000 196 393 589 785 981 1,178 1,570 1,963 2,355
HLC KLH-75 1.250 1.227 12,000 307 613 920 1,227 1,533 1,840 2,453 3,066 3,680
STD STD 1.500 1.766 —–> 442 883 1,325 1,766 2,208 2,649 3,533 4,416 5,299
HLC KLH-100 1.750 2.404 23,000 601 1,202 1,803 2,404 3,005 3,606 4,808 6,010 7,212
HLC KLH-112 1.750 2.404 40,000 601 1,202 1,803 2,404 3,005 3,606 4,808 6,010 7,212
HLC KLH-150 2.000 3.140 60,000 785 1,570 2,355 3,140 3,925 4,710 6,280 7,850 9,420
STD STD 2.000 3.140 —–> 785 1,570 2,355 3,140 3,925 4,710 6,280 7,850 9,420
HLC KLH-112LB 3.000 7.065 40,000 1,766 3,533 5,299 7,065 8,831 10,598 14,130 17,663 21,195
HLC KLH-200 3.000 7.065 110,000 1,766 3,533 5,299 7,065 8,831 10,598 14,130 17,663 21,195
STD STD 3.000 7.065 —–> 1,766 3,533 5,299 7,065 8,831 10,598 14,130 17,663 21,195
STD STD 3.250 8.292 —–> 2,073 4,146 6,219 8,292 10,364 12,437 16,583 20,729 24,875
HLC KLH-150LB 4.000 12.560 60,000 3,140 6,280 9,420 12,560 15,700 18,840 25,120 31,400 37,680
HLC KLH-300 4.000 12.560 210,000 3,140 6,280 9,420 12,560 15,700 18,840 25,120 31,400 37,680
STD STD 4.000 12.560 —–> 3,140 6,280 9,420 12,560 15,700 18,840 25,120 31,400 37,680
STD STD 5.000 19.625 —–> 4,906 9,813 14,719 19,625 24,531 29,438 39,250 49,063 58,875
HLC KLH-200LB 5.500 23.746 110,000 5,937 11,873 17,810 23,746 29,683 35,619 47,493 59,366 71,239
STD STD 6.000 28.260 —–> 7,065 14,130 21,195 28,260 35,325 42,390 56,520 70,650 84,780
STD STD 7.000 38.465 —–> 9,616 19,233 28,849 38,465 48,081 57,698 76,930 96,163 115,395
STD STD 8.000 50.240 —–> 12,560 25,120 37,680 50,240 62,800 75,360 100,480 125,600 150,720
STD STD 10.000 78.500 —–> 19,625 39,250 58,875 78,500 98,125 117,750 157,000 196,250 235,500

Preload defines the force applied to the slide before injection. Using preload forces higher than injection forces ensures the cores do not move. HLCs provide examples of larger preload forces with a smaller bore size relative to standard cylinders. The locking feature also eliminates the need to maintain pressure during injection.

For example, extend forces of 40,000 lbf (20 ton) in a 3-inch bore hydraulic locking cylinder would require a 6-inch bore standard hydraulic cylinder. The force is only available if hydraulic pressure is maintained. In all but the smallest applications, hydraulic locking cylinders provide a large force advantage to standard cylinders.

Pull Conditions
Pull Force in lbf @ listed hydraulic pressure psi
Cylinder Type Standard or PFA HLC Bore Dia.
(inches)
Rod Dia
(inches)
Diff. Area
(sq. inches)
250 500 750 1000 1250 1500 2000 2500 3000
HLC KLH-70 1.000 0.750 0.343 86 172 258 343 429 515 687 859 1,030
HLC KLH-75 1.250 0.750 0.785 196 393 589 785 981 1,178 1,570 1,963 2,355
STD STD 1.500 0.625 1.460 365 730 1,095 1,460 1,825 2,189 2,919 3,649 4,379
1.500 1.000 0.981 245 491 736 981 1,227 1,472 1,963 2,453 2,944
HLC KLH-100 1.750 1.000 1.619 405 810 1,214 1,619 2,024 2,429 3,238 4,048 4,857
HLC KLH-112 1.750 1.125 1.411 353 705 1,058 1,411 1,763 2,116 2,821 3,526 4,232
HLC KLH-150 2.000 1.500 1.374 343 687 1,030 1,374 1,717 2,061 2,748 3,434 4,121
STD STD 2.000 1.000 2.355 589 1,178 1,766 2,355 2,944 3,533 4,710 5,888 7,065
2.000 1.375 1.656 414 828 1,242 1,656 2,070 2,484 3,312 4,140 4,968
STD STD 2.500 1.000 4.121 1,030 2,061 3,091 4,121 5,152 6,182 8,243 10,303 12,364
2.500 1.375 3.422 856 1,711 2,567 3,422 4,278 5,133 6,844 8,555 10,266
2.500 1.750 2.502 626 1,251 1,877 2,502 3,128 3,753 5,004 6,255 7,507
HLC KLH-112LB 3.000 1.125 6.071 1,518 3,036 4,554 6,071 7,589 9,107 12,143 15,179 18,214
HLC KLH-200 3.000 2.000 3.925 981 1,963 2,944 3,925 4,906 5,888 7,850 9,813 11,775
STD STD 3.000 1.000 6.280 1,570 3,140 4,710 6,280 7,850 9,420 12,560 15,700 18,840
3.000 1.375 5.581 1,395 2,790 4,186 5,581 6,976 8,371 11,162 13,952 16,743
3.000 1.750 4.661 1,165 2,330 3,496 4,661 5,826 6,991 9,322 11,652 13,983
STD STD 3.250 1.375 6.807 1,702 3,404 5,106 6,807 8,509 10,211 13,615 17,019 20,422
3.250 1.750 5.888 1,472 2,944 4,416 5,888 7,359 8,831 11,775 14,719 17,663
3.250 2.000 5.152 1,288 2,576 3,864 5,152 6,439 7,727 10,303 12,879 15,455
HLC KLH-150LB 4.000 1.500 10.794 2,698 5,397 8,095 10,794 13,492 16,191 21,588 26,984 32,381
HLC KLH-300 4.000 3.000 5.495 1,374 2,748 4,121 5,495 6,869 8,243 10,990 13,738 16,485
STD STD 4.000 1.750 10.156 2,539 5,078 7,617 10,156 12,695 15,234 20,312 25,390 30,468
4.000 2.000 9.420 2,355 4,710 7,065 9,420 11,775 14,130 18,840 23,550 28,260
4.000 2.500 7.654 1,913 3,827 5,740 7,654 9,567 11,481 15,308 19,134 22,961
STD STD 5.000 2.000 16.485 4,121 8,243 12,364 16,485 20,606 24,728 32,970 41,213 49,455
5.000 2.500 14.719 3,680 7,359 11,039 14,719 18,398 22,078 29,438 36,797 44,156
5.000 3.000 12.560 3,140 6,280 9,420 12,560 15,700 18,840 25,120 31,400 37,680
5.000 3.500 10.009 2,502 5,004 7,507 10,009 12,511 15,013 20,018 25,022 30,026
HLC KLH-200LB 5.500 2.000 20.606 5,152 10,303 15,455 20,606 25,758 30,909 41,213 51,516 61,819
STD STD 6.000 2.500 23.354 5,838 11,677 17,515 23,354 29,192 35,031 46,708 58,384 70,061
6.000 3.000 21.195 5,299 10,598 15,896 21,195 26,494 31,793 42,390 52,988 63,585
6.000 3.500 18.644 4,661 9,322 13,983 18,644 23,305 27,966 37,288 46,609 55,931
6.000 4.000 15.700 3,925 7,850 11,775 15,700 19,625 23,550 31,400 39,250 47,100
STD STD 7.000 3.000 31.400 7,850 15,700 23,550 31,400 39,250 47,100 62,800 78,500 94,200
7.000 3.500 28.849 7,212 14,424 21,637 28,849 36,061 43,273 57,698 72,122 86,546
7.000 4.000 25.905 6,476 12,953 19,429 25,905 32,381 38,858 51,810 64,763 77,715
7.000 4.500 22.569 5,642 11,284 16,927 22,569 28,211 33,853 45,138 56,422 67,706
STD STD 8.000 3.500 40.624 10,156 20,312 30,468 40,624 50,780 60,936 81,248 101,559 121,871
8.000 4.000 37.680 9,420 18,840 28,260 37,680 47,100 56,520 75,360 94,200 113,040
8.000 5.000 30.615 7,654 15,308 22,961 30,615 38,269 45,923 61,230 76,538 91,845
STD STD 10.000 4.500 62.604 15,651 31,302 46,953 62,604 78,255 93,906 125,208 156,509 187,811
10.000 5.000 58.875 14,719 29,438 44,156 58,875 73,594 88,313 117,750 147,188 176,625
10.000 5.500 54.754 13,688 27,377 41,065 54,754 68,442 82,131 109,508 136,884 164,261

Cylinder retract or pull force is always less than extend or set force due to reduced piston area. Oversized rods in HLC cylinders provide greater preload capacity and are allowable for most applications. However, for long cores with significant plastic shrinkage, a larger bore may be necessary to provide sufficient pull force.

 

Pull forces in hydraulic locking cylinders are much less relative to the larger bore standard hydraulic cylinders. When using a standard cylinder, the pull force is often capable of pulling the core, while when using a hydraulic locking cylinder, penetrating cores may be more problematic. In most cases, however, parts do not have significant part penetration and pull forces are relatively low or can be reduced by increasing draft or adding stops to the core.

For best results, consider all the stroke positions of the cylinder, both set and pull, and calculate forces.  Chose the best preload, bore and rod combination that meets all requirements, ensuring pressure is available to the cylinder during injection, as appropriate.

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