EXPANSION CLAMPING CHUCK

摘要

An expansion chuck for simultaneously chucking a tool shaft and a hollow tool part such as a beveling bush. A solid chuck body which can be chucked in the working spindle of a machine tool has in its chucking part a central receptacle bore to receive the tool shaft to be chucked as well as an external chucking face to mount the hollow tool part. An elongated toroidal chamber is arranged coaxially with the receptacle bore and the outside chucking face in the interior of the chucking part of the chuck body and is filled with an incompressible medium. Due to a hydraulic internal pressure in the toroidal chamber, both of its peripheral walls undergo elastic deformation, radially inwardly to chuck the tool shaft, and radially outwardly to chuck the hollow tool part.