Introduction The power clamping screws are equipped with a wedge system as force amplifier. This innovative system allows for highest clamping forces with low actuation torques and simple manual operation. The robust design of all parts, the self-locking mechanism as well as a high overload capability guarantee maximum operational safety. The clamping screws have various application possibilities, mainly in presses, punches and machine tools, as well as in jigs, fixtures and similar devices.
Function The wedge clamping system of the SC clamping screw is self-locking in each clamping position due to its geometry and offers a clamping stroke of up to 3 mm. This way, depending on the actuation torque, very high clamping forces up to the nominal clamping force can be achieved.
Clamping procedure
The infeed of the clamping screw down to a solid contact with the part to be clamped (7) is the first step, done by manually turning the housing (1) clockwise. Only then, the hexagon of the actuation spindle (2) should be turned clockwise, thus moving the forced-in key (3) in axial direction and pressing the wedge parts (4) in radial direction. The latter motion results in the axial stroke of the thrust piece (5) against the workpiece (7). The clamping force is led over the wedge bearing (6) through the housing (1) into the clamping device (8).
After approximately two turns of the actuation hexagon the travel of the thrust piece will be blocked by an internal fixed stop and the torque wrench will disengage although the required clamping force has not been generated; the clamping operation has to be repeated. The clamping stroke state is indicated by the operating path 's'. The maximum clamping position is reached when the lower cylindrical portion of the actuation hexagon is even with the top of the housing (Fig. A2).
Release procedure the release procedure is carried out in reverse order. By turning the operating hexagon to the left up to the fixed back stop (Fig. Al), the wedge slide moves back, and the clamping mechanism is released. Coil springs push the pressure piece and the wedges back into the starting position. to ensure the required clamping force is achieved and to protect the internal mechanism from damage, we recommend the use of a torque wrench for applying the actuation torque. Under certain conditions, clamping is also acceptable with a standard wrench or socket wrench. the clamping screws are lubricated for life and maintenance free under normal operating conditions. A high temperature version of up to 400°C is possible.
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