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.
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.
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
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.
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.
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.
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.
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.
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.
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:
with safety step on request
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.
Applications
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
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
temperature resistance up to 250°C
available on request
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
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.
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.
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.
5-stage drop forge, equipped with wedge clamps, with directional control valves for the control of the different stages.
Wedge clamps with sequence valve control on a forging press
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 160 kN clamping force on a Windsor W 550.
Wedge clamps on a Demag Ergotech 250/630 injection moulding machine.
Wedge clamps in a forging die. Temperatures up to 250C. Possible versions for forging applications.
Wedge clamps with check valve on a Krauss Maffai injection moulding machine.
Wedge clamp with hydraulic ports A + B at the right and an additional
cooling circuit C + D at the opposite, left side.