Power spindle
A power-operated clamping spindle , the clamping spindle , motor spindle or high-pressure screw is a clamping element which in a hydraulic or mechanical embodiment for the frictional clamping is used by heavy workpieces on machining large machines.
Power clamping spindles are installed directly or in claw boxes in the face plate of vertical, flat bed, center, face and rolling lathes as well as grinding and special machines.
With a suitable power transmission, they enable high clamping forces in the power flow between the workpiece , clamping jaw and face plate with low tightening torques.
Power clamping spindles are designed with regard to the clamping direction in single or double-acting construction for external and internal clamping.
Mechanical power clamping spindles
Mechanical power clamping spindles have a mechanical power transmission in the form of clamping wedges or toggle levers.
The power transmission is achieved in both types of construction by a sophisticated mechanism with high self-locking and operational reliability .
Hydromechanical power clamping spindles
This type of construction has an internal oil circuit with a pressure booster , whereby the oil volume is pressed onto a large clamping piston area with the aid of a displacement piston with a small area and a large stroke, and the force is multiplied. The advantages of this system are large clamping strokes of up to 8 mm and lower tightening torques.
The risk of oil leakage, which can never be ruled out, has a disadvantage, which can result in a significant loss of clamping force during operation. An additional mechanical counter mechanism is therefore indispensable for operational safety . Due to the associated higher costs, the mechanical power clamping spindle is the economically more favorable version in many applications.
Essential performance features of the power clamping spindles
- Very high clamping forces of 100 kN to 500 kN with low tightening torques
- Maximum operational safety
- High rigidity
- Large force clamping stroke and high alignment accuracy
- Simple operation and assembly
- Low maintenance
See also
literature
- S. Hesse, H. Krahn, D. Eh: Operating means device. Carl Hanser Verlag, Munich 2002, ISBN 3-446-21914-5 , p. 33 f.
- Clamping devices for the biggest. In: workshop + company. (Carl Hanser Verlag, Munich). No. 11, 2007, www: WB101844, pp. 74-78.
- G. Brand: Firm hold for large parts. In: www.k-magazin.de , No. 8, 2007, www-info: K07-08-0184, p. 50.
- Powerhouses everywhere you look. In: NC manufacturing. No. 7, 2007, p. 112 f.