Gebr. Heller Maschinenfabrik Gmbh

Emag Maschinenfabrik Gmbh

Juergen Walz

Erhard Hummel

A workpiece holder device for a machine tool has a holder, which has a support part and a holder part. The support part supports the holder on a support device, preferably so that the holder can rotate about an axis of rotation. The holder part is set up to hold a workpiece directly or indirectly. To avoid, or at least minimize deviations from a desired alignment of the holder part based on elastic deformation of the holder due to the weight force of the workpiece, the holder has at least one mechanical or hydraulic pretensioning device arranged on or in it. The pretensioning device can be used to pretension the material of the holder, so that the pretensioning device applies a tensile stress or a compressive stress to at least one part of the holder. This can counteract a deviation of position due to an elastic deformation of the holder.

Workpiece holder device

Method and apparatus providing a tool turret for a machine tool with at least one motor-driven tool that is suitable for machining of wavy or tubular workpieces. The transport of the workpieces from one machining station to the next is effected in a simpler, more reliable, and less expensive fashion, because the machine tool has a tool turret that includes a gripping element for taking hold of, transporting, and positioning workpieces, rather than using an additional tool.

Growing community of inventors

Frickenhausen, Germany

Juergen Walz