Patent ID: 6568055
Filing Date: 2003-05-27
Classification: B23Q,Y10T

Abstract:
An arbor clamping apparatus for a boring and milling machine, comprising:a hollow milling arbor, having: a first step spindle having a head part adapted for receiving cutting tools and fixtures; and a second step spindle connected with said first step spindle, and having an inner wall; a boring arbor disposed in a center hollow space of said milling arbor, and being movable in an axial direction of said milling arbor, and rotatable with said milling arbor and at a same speed thereof; and a clamping mechanism, including: wedges disposed in a region near where said second step spindle is connected to said first step spindle, and between the inner wall of said second step spindle and the boring arbor, said wedges being movable in the axial direction of said milling arbor; a fixed shell that is fixable with a primary body housing of the boring and milling machine, said fixed shell having an annular shape, and enclosing an outside region of said milling arbor, an inner wall of said fixed shell defining a hydraulic chamber; an annular piston disposed inside the hydraulic chamber; a bearing disposed against an inner wall of said piston; and a driving element disposed against the bearing, and surrounding said first step spindle, said driving element being fixed with said wedges such that a motion induced from said piston and said bearings is transmitted to said wedges by way of said driving element, and via an approaching action between said wedges and said boring arbor, a clamping for said boring arbor is achieved; wherein said piston has a stretching rib on one side thereof, and which projects toward an axis of said milling arbor, and wherein an annular lid is fixed to said piston at another side thereof.