Wedge clamps

Hydraulic block cylinders that operate a clamping bolt in a guide housing.

For straight or tapered clamping edge, double acting.
Wedge clamps are hydraulic clamping elements, which are installed in a fixed position, e.g. on press beds or machine table. Here you will find compact, sturdy and proven clamping elements with highest clamping forces in many different versions.

Series  (11)

Items  (93)

  1. for dies with bevelled clamping edge – clamping bolt with a 20° bevel – without position monitoring – cylinder Ø: 25 mm – admissible operating force – for screws M12 - 8.8: 35 kN – max. clamping force: 25 kN at 350 bar – max. stroke: 20 mm – clamping stroke: 15-18 mm – temperature resistance: up to 160 °C – max. operating pressure: 350 bar – as per catalogue sheet WZ 2.24000 – – link to the product video: – https://youtu.be/QRotDIjhogE – – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ224000&dllang=en
  2. for dies with bevelled clamping edge – clamping bolt with a 20° bevel – without position monitoring – cylinder Ø: 40 mm – admissible operating force – for screws M16 - 8.8: 65 kN – max. clamping force: 50 kN at 275 bar – max. stroke: 25 mm – clamping stroke: 18-22 mm – temperature resistance: up to 160 °C – max. operating pressure: 275 bar – as per catalogue sheet WZ 2.24000 – – link to the product video: – https://youtu.be/QRotDIjhogE – – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ224000&dllang=en
  3. for dies with bevelled clamping edge – clamping bolt with a 20° bevel – without position monitoring – cylinder Ø: 50 mm – admissible operating force – for screws M20 - 8.8: 130 kN – max. clamping force: 100 kN at 350 bar – max. stroke: 25 mm – clamping stroke: 19-22 mm – temperature resistance: up to 160 °C – max. operating pressure: 350 bar – as per catalogue sheet WZ 2.24000 – – link to the product video: – https://youtu.be/QRotDIjhogE – – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ224000&dllang=en
  4. for dies with bevelled clamping edge – clamping bolt with a 20° bevel – without position monitoring – cylinder Ø: 63 mm – admissible operating force – for screws M24 - 8.8: 210 kN – max. clamping force: 160 kN at 350 bar – max. stroke: 30 mm – clamping stroke: 23-27 mm – temperature resistance: up to 160 °C – max. operating pressure: 350 bar – as per catalogue sheet WZ 2.24000 – – link to the product video: – https://youtu.be/QRotDIjhogE – – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ224000&dllang=en
  5. for dies with bevelled clamping edge – clamping bolt with a 20° bevel – without position monitoring – cylinder Ø: 80 mm – admissible operating force – for screws M30 - 8.8: 320 kN – max. clamping force: 250 kN at 350 bar – max. stroke: 32 mm – clamping stroke: 24-29 mm – temperature resistance: up to 160 °C – max. operating pressure: 350 bar – as per catalogue sheet WZ 2.24000 – – link to the product video: – https://youtu.be/QRotDIjhogE – – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ224000&dllang=en
  6. for dies with bevelled clamping edge – clamping bolt with a 20° bevel – without position monitoring – cylinder Ø: 100 mm – admissible operating force – for screws M36 - 8.8: 520 kN – max. clamping force: 400 kN at 350 bar – max. stroke: 40 mm – clamping stroke: 30-36 mm – temperature resistance: up to 160 °C – max. operating pressure: 350 bar – as per catalogue sheet WZ 2.24000 – – link to the product video: – https://youtu.be/QRotDIjhogE – – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ224000&dllang=en
  7. for dies with bevelled clamping edge – clamping bolt with a 20° bevel – without position monitoring – cylinder Ø: 125 mm – admissible operating force – for screws M42 - 8.8: 820 kN – max. clamping force: 630 kN at 350 bar – max. stroke: 40 mm – clamping stroke: 30-36 mm – temperature resistance: up to 160 °C – max. operating pressure: 350 bar – as per catalogue sheet WZ 2.24000 – – link to the product video: – https://youtu.be/QRotDIjhogE – – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ224000&dllang=en
  8. for dies with bevelled clamping edge – clamping bolt with a 20° bevel – with position monitoring (at the back) – with proximity switches – cylinder Ø: 25 mm – admissible operating force – for screws M12 - 8.8: 35 kN – max. clamping force: 25 kN at 350 bar – max. stroke: 20 mm – clamping stroke: 15-18 mm – temperature resistance – dependent on the proximity switch – max. operating pressure: 350 bar – as per catalogue sheet WZ 2.24002 – – link to the product video: – https://youtu.be/QRotDIjhogE – – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ224002&dllang=en
  9. for dies with bevelled clamping edge – clamping bolt with a 20° bevel – with position monitoring (at the back) – with proximity switches – cylinder Ø: 40 mm – admissible operating force – for screws M16 - 8.8: 65 kN – max. clamping force: 50 kN at 275 bar – max. stroke: 25 mm – clamping stroke: 18-22 mm – temperature resistance – dependent on the proximity switch – max. operating pressure: 275 bar – as per catalogue sheet WZ 2.24002 – – link to the product video: – https://youtu.be/QRotDIjhogE – – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ224002&dllang=en
  10. for dies with bevelled clamping edge – clamping bolt with a 20° bevel – with position monitoring (at the back) – with proximity switches – cylinder Ø: 50 mm – admissible operating force – for screws M20 - 8.8: 130 kN – max. clamping force: 100 kN at 350 bar – max. stroke: 25 mm – clamping stroke: 19-22 mm – temperature resistance – dependent on the proximity switch – max. operating pressure: 350 bar – as per catalogue sheet WZ 2.24002 – – link to the product video: – https://youtu.be/QRotDIjhogE – – link to PDF catalogue sheet: – https://www.roemheld-gruppe.de/en/?dlname=WZ224002&dllang=en
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Description

Wedge clamps for tapered clamping edge

Double-acting wedge clamp for clamping dies on a press bed or ram or for clamping dies in injection moulding machines. The wedge clamp consists of a hydraulic block cylinder and a piston guided in a housing. The clamping bolt is provided with 20° bevel to clamp on the tapered clamping surface of the die. Based on the internal design of the wedge clamp and the 20° bevel of the clamping bolt, the system is providing internal friction. For safety reasons and in the sense of the machine tool guide lines 89/37/EC the hydraulic pressure must be maintained. When upper dies are clamped by wedge clamps, they must be secured mechanically when maintenance work is carried out.

Applications

  • safe clamping of dies with tapered clamping edge
  • for clamping of dies on press bed and ram
  • for clamping of dies in injection moulding machines

Special features

  • sizes from 25 kN to 1250 kN clamping force
  • high operational safety by position monitoring and automatic motion sequence
  • very sturdy and proven clamping element with a high standard of safety and a long service life

Safety steps

  • 1. without safety step
  • 2. with safety step
  • 3. with form-fit safety step
Clamping principle Wedge clamps for tapered clamping edge

2.2401 Wedge clamps

without and with position monitoring at the side
The proximity switches are installed in the guide housing. They are activated by means of the wedge bolt. The positions bolt in off position or in clamping position are displayed. 
Temperature resistance: up to 100 °C (with position monitoring)
cable length: 250 mm
connector: 4 pole

Wedge clamp 2.2401 without and with position monitoring at the side

2.2402 Wedge clamps

with adjustable position monitoring at the back
The position monitoring will be screwed on at the cylinder bottom and can also be mounted in a position rotated by 180°. Different versions are available according to the application conditions. 
A control cam is provided at the extended piston rod causing the activation of the proximity switches. Adjustment of the switching position is effected by displacement of the proximity switches in the lateral groove. 
The proximity switches are switched on in a stroke range of approx. 6 mm by means of the control cam. The minimum distance to the positions to be monitored depends on the switch type.

Wedge clamp 2.2402 with adjustable position monitoring at the back

2.2403 Wedge clamps

with safety step, without and with position monitoring
The clamping bolt of this version has an additional support surface parallel to the clamping edge. In the case of pressure drop (machine failure or down time) the upper die can be lowered to the safety step and safely held.

Wedge clamp 2.2403 with safety step, without and with position Monitoring

2.2404 Wedge clamps

with form-fit safety step and position monitoring
This patented design has a form-fit safety step in the form of a lug at the clamping bolt, which has the same shape as the adapter on the mould/die clamping edge. In the case of pressure drop (machine failure or down time) the upper mould/die lowers to the safety step onto the safety lug and is safely held by form fit. The clamping bolt can not be returned to the unclamping position and the upper mould/die is safely held.

Wedge clamp 2.2404 with form-fit safety step and position monitoring

2.2405 Wedge clamps

with locking bolt, without and with position monitoring at the side 
The clamping bolt of the wedge clamp is secured against retraction with an additional locking cylinder. Leaving the clamping position is only possible by unlocking the locking bolt.

Wedge clamp 2.2405 with locking bolt, without and with position monitoring at the side

2.2407 Wedge clamps

with sequence valve control for high temperature ranges
An additional valve block on the standard wedge clamp enables hydraulic control of the clamping position. Only after the last wedge clamp has been clamped, the machine control is released by a pressure switch on the pressure generator.

Wedge clamp 2.2407 with sequence valve control

2.2407 Wedge clamps with double sequence valve control

to monitor the clamping and unclamping position
The wedge clamp enables the hydraulic control of the clamping and unclamping position. Only after the last wedge clamp has been clamped, the machine control is released by a pressure switch on the pressure generator. 

2.2407 Double sequence valve control

2.2409 Wedge clamps

with single valve control for individual control
with manifold-mounted directional control valves as control valves for the separate control of all clamping elements
Special advantages:

  • each element can be individually controlled
  • single dies can be clamped
  • little installation work as a result of a plug-type closed hydraulic circuit
  • suitable for BUS systems
  • high degree of operational safety thanks to integrated position monitoring and check valves


with safety step on request

  • very sturdy clamping element with a high standard of safety and a long service life
Wedge Clamp 2.2409 with single valve control
2.2409 Single valve control

2.2410 Wedge clamps

with cooling circuit for temperatures up to 250 °C
In addition, there is a cooling circuit for oil cooling in the block cylinder. This cooling circuit guarantees a steady temperature at the sealing surfaces of the hydraulic supply.
When dimensioning the cooling circuit, the occurring temperatures and the admissible temperature at the clamping element must be considered.

Wedge Clamp 2.2410 with cooling circuit
Cooling ports C and D

Wedge clamps for straight clamping edge

Applications

  • safe clamping of dies with straight clamping edge
  • for clamping of dies in injection moulding machines
  • for clamping of dies on press bed and ram
Clamping principles Wedge clamps for straight clamping edge

2.2450 Wedge Clamps

single acting, clamping with spring force and hydraulic unclamping,
retention force 25 up to 120 kN, with and without position monitoring

The wedge clamping elements consist of a guide housing with one-piece clamping bolt.
Clamping cycle: the clamping bolt which is inclined by 6° performs an idle stroke and simultaneously a clamping stroke. The clamping bolt is lowered axially onto the clamping edge. The 6° angle, the spring force in the clamping bolt and the frictional engagement at the clamping point create a self-locking connection. The wedge clamping element should preferably be used with position monitoring.


Advantages

  • safe clamping of dies with straight clamping edge
  • high operating safety due to clamping by spring force, inductive and visual position monitoring
  • position monitoring on the left or right side
  • clamping element with self-locking
    dimensions in accordance with Euromap guidelines
  • no clamping edge bevels are required
  • variable clamping edge heights (spacer plates)
  • tolerance of clamping edge height ± 0.5 mm
  • the pressure of the machine hydraulics of 160 bar is sufficient for unclamping
  • very sturdy and compact design
  • housing with stainless coating
  • flexible connecting possibilities by 4 hydraulic Connections
Wedge Clamps 2.2450 with and without position monitoring
Wedge Clamp 2.2450

2.2451 Wedge clamps

double acting, operating force 35 up to 120 kN, hydraulic clamping and
unclamping, without and with position monitoring at the side

Double-acting wedge clamp for clamping dies on a press bed or ram or for clamping dies in injection moulding machines with Euromap mounting grid.
The wedge clamp consists of a hydraulic block cylinder connected with a clamping bolt in a floating manner. Clamping cycle: the clamping bolt which is inclined by 5° performs an idle stroke and simultaneously a clamping stroke. 
The clamping bolt is lowered axially onto the clamping edge. The 5° angle of the housing has been determined so as to ensure that despite frictional engagement on the clamping edge the hydraulic pressure required for unclamping is sufficient. Since the clamping force is vertically transmitted to the clamping point, only low side loads occur. The wedge clamp is available with or without position monitoring. 

Special features

  • side loads are compensated by drill bushings
  • high operational safety by position monitoring and automatic motion sequence
  • very sturdy and compact design clamping element with a high standard of safety and a long service life
  • retracting clamping bolt ensures unimpeded die and tool change
  • clamping and unclamping pressures are different


temperature resistance up to 250°C
available on request

Wedge clamp 2.2451

2.2460 Wedge clamps

double acting, operating force 35 up to 120 kN, hydraulic clamping and
unclamping, without and with position monitoring at the side

Double-acting wedge clamps are particularly suitable for safe clamping of dies with flat clamping edge on a press bed or ram or for clamping dies in injection moulding machines.
The wedge clamp consists of a hydraulic block cylinder and a two-piece mechanical clamping bolt.
Clamping cycle: the clamping bolt with thrust pad first performs an idle stroke. When the inner stop is reached, the clamping bolt is lowered onto the clamping edge. The 5° angle of the thrust pad has been determined so as to ensure that despite self-locking the hydraulic pressure required for clamping is not higher than that required for clamping.
Since the clamping force is vertically transmitted to the clamping point, no side loads occur.
The wedge clamp is available with or without position monitoring.

Special features

  • the clamping piston does not retract in the case of pressure drop
  • sizes of 25 kN, 50 kN and 100 kN
  • high operational safety by position monitoring and automatic motion sequence
  • very sturdy and compact design
  • special versions on request
  • well-proven clamping element with high degree of safety and long service life
  • retracting clamping bolt ensures unimpeded die and tool change
Wedge clamp 2.2460

Technics

Definition: Clamping force

This is the force the clamping element applies to the workpiece at maximum operating pressure. The die or the tool is clamped on the fixture plate by means of this force. The external forces acting on die or tool (e.g. ejecting force or die cushion force) shall not exceed the totality of the elements’ clamping force.

Definition: Retaining force

This is the holding force of clamping element and fastener (screw quality 8.8). The data given in the above table are based on the condition that the appropriate tightening torque has been applied, and that material and geometry of the fixtures are suitable for the purpose. It must be ensured that in cases of emergency, e.g. workpiece jammed in die or tool, the sum total of the elements’ operating forces is not exceeded.

Important notes on wedge clamps

Wedge clamping of existing dies is possible by retrofitting V-shaped inserts as shown. Max. hardness 50 HRC.

 

The occurring side loads must be absorbed by drill bushings (accessory) to be inserted into the fixture plate.

 

Please observe: in case of incorrect operation of the wedge clamping element, the clamping bolt may fully retract into the guide housing and thus cause the upper die falling off the ram.

 

The greasing intervals (high temperature grease) should be adapted to the existing operating conditions. Please note that greasing of the wedge bolts should only be made with the elements being retracted.

 

Clamping elements with wedge clamping bolt must be protected against dirt, scale, swarf, coolant, etc. by means of a suitable covering.

 

Dies or tools clamped by means of wedge clamping elements are subject to side loads that may be strong enough to displace them. Thus, positioning is required to compensate the side loads. Therefore, location pins or suitable limit stops should be provided, in order to keep the dies in their correct position.

 

When using wedge clamping elements on the press ram, it is recommended that multiple-circuit hydraulic supply of the clamping elements and pilot-controlled check valves are used for securing hydraulic clamping.

Hardenend V-shaped inserts and drill bushings
Multiple-circuit hydraulic supply

PDF Data sheets

PDF

Wedge Clamps for Tapered Clamping Edge double acting – max. clamping force 25 to 630 kN – without and with position monitoring at the side

Catalogue sheet WZ2.2401
PDF

Wedge Clamps for Tapered Clamping Edge double acting – max. clamping force 25 to 630 kN – with adjustable position monitoring at the back

Catalogue sheet WZ2.2402
PDF

Wedge Clamps for Tapered Clamping Edge double acting – max. clamping force 25 to 630 kN – with safety step – without and with position monitoring

Catalogue sheet WZ2.2403
PDF

Wedge Clamps for Tapered Clamping Edge double acting – max. clamping force 50 to 400 kN – with form-fit safety step and position monitoring

Catalogue sheet WZ2.2404
PDF

Wedge Clamps for Tapered Clamping Edge double acting – max. clamping force 25 to 630 kN – with locking bolt – without and with position monitoring at the side

Catalogue sheet WZ2.2405
PDF

Wedge Clamps for Tapered Clamping Edge double acting – max. clamping force 25 to 630 kN – with sequence valve control for high temperature ranges

Catalogue sheet WZ2.2407
PDF

Wedge Clamps for Tapered Clamping Edge double acting – max. clamping force 100 to 630 kN – with single valve control for individual control

Catalogue sheet WZ2.2409
PDF

Wedge Clamps for Tapered Clamping Edge double acting – max. clamping force 100 to 630 kN – with cooling circuit for temperatures up to 250 °C

Catalogue sheet WZ2.2410
PDF

Wedge Clamps for Straight Clamping Edge single acting – operating force 25 up to 120 kN – clamping with spring force and hydraulic unclamping – without and with Position Monitoring –

Catalogue sheet WZ2.2450
PDF

Wedge Clamps for Straight Clamping Edge double acting – operating force 35 up to 120 kN – hydraulic clamping and unclamping – without and with position monitoring

Catalogue sheet WZ2.2451
PDF

Wedge Clamps for Straight Clamping Edge double acting – clamping force 25 up to 100 kN – hydraulic clamping and unclamping – without and with position monitoring –

Catalogue sheet WZ2.2460

Application examples

Application videos

Application example 1

5-stage drop forge, equipped with wedge clamps, with directional control valves for the control of the different stages.

5-stage drop forge, equipped with wedge clamps
5-stage drop forge, equipped with wedge clamps

Application example 2

Wedge clamps with sequence valve control on a forging press

Wedge clamps with sequence valve control on a forging press

Application example 3

Wedge clamps with directly manifold-mounted directional control valves. Clamping and unclamping position electrically monitored. Easy to install with plug-in connections between the clamping elements.

Wedge clamps with directly manifold-mounted directional control valves

Application example 4

Wedge clamps 160 kN clamping force on a Windsor W 550.

Wedge clamps on a Demag Ergotech 250/630 injection moulding machine

Application example 5

Wedge clamps on a Demag Ergotech 250/630 injection moulding machine.

Wedge clamps on a Demag Ergotech 250/630 injection moulding machine

Application example 6

Wedge clamps in a forging die. Temperatures up to 250C. Possible versions for forging applications.

Wedge clamps in a forging die

Application example 7

Wedge clamps with check valve on a Krauss Maffai injection moulding machine.

Wedge clamps with check valve on a Krauss Maffai injection moulding machine

Application example 8

Wedge clamp with hydraulic ports A + B at the right and an additional
cooling circuit C + D at the opposite, left side.

Wedge clamp with cooling circuit
Wedge clamp with cooling circuit
Wedge clamp with cooling circuit on the press ram