Abstract: The invention relates to a speed-changing shearing or forming active element insert which is designed to be detachably connected to an active element receptacle of a machine tool, the speed-changing shearing or forming active element insert having a speed-changing unit which is in the form of a hydraulic force/distance transducer, the force/distance transducer comprising a housing, the housing interior of which is supplied with a hydraulic fluid, and the force/distance transducer comprising a first piston which is in oo contact with the hydraulic fluid via one piston end and a second piston which is in contact with the hydraulic fluid via one piston end and the cross-sectional area of which is smaller than the cross-sectional area of the first piston. The invention also relates to the use of the speed-changing changing shearing or forming active element insert in a machine tool.

Abstract: The invention relates to a speed-changing shearing or forming active element insert which is designed to be detachably connected to an active element receptacle of a machine tool, the speed-changing shearing or forming active element insert having a speed-changing unit which is in the form of a hydraulic force/distance transducer, the force/distance transducer comprising a housing, the housing interior of which is supplied with a hydraulic fluid, and the force/distance transducer comprising a first piston which is in oo contact with the hydraulic fluid via one piston end and a second piston which is in contact with the hydraulic fluid via one piston end and the cross-sectional area of which is smaller than the cross-sectional area of the first piston. The invention also relates to the use of the speed-changing changing shearing or forming active element insert in a machine tool.

Abstract: The invention relates to drawn pieces made of steel plate, particularly for motor vehicles bodies, and to a process for manufacturing such drawn pieces. In order to be able to manufacture drawn pieces with a high piece strength but of a low weight and with a low susceptibility to denting in a simple manner, according to the invention, a spring steel plate which is already hardened in the initial state, particularly bainitized—for example, CK60 or C63 or 67SiCr5—is used during the drawing of the vehicle body parts. The yield point of the heat-treated plate bar material is approximately in the range of from 800 to 1,800 N/mm2; the tensile strength is above that. Because of these strength values, plate bars of a plate thickness of approximately 0.3 mm to 0.6 mm can be used, whereby approximately 20 to 60% of the previous piece weight can be saved. The drawn piece according to the invention is therefore a definite lightweight part.