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Wedge Clamps;  Single or Double-Acting hydraulic, or Electric
(For Straight-Edge Tools)

Wedge Clamps for flat clamping edge used in injection mold machine applications or for  die clamping on stamping presses. 

 

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. It has a spring force and hydraulic unclamping, retention force 25 up to 120 kN, with and without position monitoring. 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

  • 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

 

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2.2450

 

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

 

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2.2451

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

Clamping force 25 up to 100 kN hydraulic clamping and unclamping without and with position monitoring. The double acting wedge clamps consist of a
hydraulic block cylinder connected with a two piece mechanical clamping bolt in a floating
manner. Clamping cycle: the clamping bolt with thrust pad first performs an idle stroke. When the
inner stop is reached, the clamping bolt is vertically lowered onto the clamping edge.

 

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2.2460

 

 

Wedge Clamp, electro-mechanical, max. operating force 240 kN for Flat Clamping Edge

Electro-mechanical wedge clamps are used for hydraulic free clamping of dies or molds in metal forming presses and injection molding machines.

 

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5.2670

 


Technical Data 

 

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.


 

Applications

APPLICATION EXAMPLE 1

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

 

APPLICATION EXAMPLE 2

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.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

APPLICATION EXAMPLE 4

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

 

 

 

APPLICATION EXAMPLE 5

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.

 

 

APPLICATION EXAMPLE 7

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.

 

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