Patent ID: 6348029
Filing Date: 2002-02-19
Classification: B23B,B23Q,Y10S,Y10T

Abstract:
A machine tool, especially for machining of workpieces, including triaxial machining of workpieces, the machine tool comprising:at least one machining unit, which has at least one work spindle which can be rotatably driven around an axis of rotation, the spindle having a revolver head with a plurality of driven spindles, which each carry a tool in a tool carrier and are displaceable in a work space in the X, Y and Z directions; at least one tool magazine arranged in said work space; an actuating device for the automatic change of tools, without use of an intermediate holder, directly from said tool carrier at said spindle into said tool carrier at said tool magazine and vice versa; a tool carrier at said driven spindle with a hydraulic expansion chuck, which can be pressed automatically against a tool shank by operation of said spindle; a ring arranged rotatably movably on said tool carrier of said driven spindle for actuating at least one linearly movable hydraulic piston for tensioning and releasing said hydraulic expansion chuck while pressure of the hydraulic medium of said hydraulic expansion chuck changes; and elements arranged on said ring for preventing rotation, said elements fixing said ring at said tool carrier of said tool magazine during a releasing or a tightening of said hydraulic expansion chuck by rotating said tool carrier.