Patent ID: 9205496
Filing Date: 2015-12-08
Classification: B23B,Y10T

Abstract:
1. A tool holder, comprising: a tool receptacle in the form of a sleeve part, which has a tool receiving opening with a mating surface concentric to a rotation axis of the tool holder to which it is to fasten a shank of a tool, which has been properly inserted into the tool receiving opening of the sleeve part, in a press fit, and the sleeve part has a plurality of recesses extending in from the mating surface; wherein the recesses divide the mating surface into at least two and no more than eight comparable mating surface segments that are essentially intrinsically rigid in the axial direction such that the mating surface segments do not deform when the tool shank is subjected to axial forces that have a tendency to pull the tool shank out of the sleeve part or push the shank farther into the sleeve part, with a radial depth of the recesses that is selected to prevent or minimize warpage of the sleeve part, wherein the radial depth of the recesses is selected according to a wall thickness of the sleeve part and a nominal diameter of the tool shank to be chucked or a ratio between these two quantities, wherein the sleeve part has a wall thickness in the region of the mating surface of at least 15 mm, and the recesses weaken the sleeve part by more than ¼ and by less than ½ of the wall thickness, and the radial depth of the recesses being selected so that the press fit releases in an essentially uniform fashion at all mating surface segments under the influence of heat applied over an outer circumference of the sleeve part.