Patent ID: 8963059
Filing Date: 2015-02-24
Classification: B23P,H05B

Abstract:
1. A device for inductively clamping and unclamping a tool shaft of a tool in a tool holder which includes a clamping sleeve that is open at a free end and made from electrically conductive material for receiving the tool shaft through friction locking, wherein the clamping sleeve forms a rotation axis with the tool holder, with an induction coil assembly enveloping the clamping sleeve and including two coil units that are arranged on a same axis and that are axially adjustable relative to one another and that are included in a first concentrator assembly made from magnetically conductive and electrically non-conductive material, wherein the concentrator assembly envelops the induction coil assembly and with a second concentrator assembly made from magnetically conductive and electrically non-conductive material wherein the second concentrator assembly is formed from concentrator elements which are adjustable relative to the rotation axis with respect to their operating position for inductively heating the clamping sleeve, in which the concentrator elements at least partially cover a free face of the clamping sleeve, wherein the concentrator elements are configured to be feedable through a feeding movement relative to the rotation axis at a slant angle wherein the first and second concentrator elements are feedable at different locations around the rotational axis so that the feeding movement includes a radial and an axial component into their operating position in which the concentrator elements at least partially cover the free face of the clamping sleeve for inductively heating the clamping sleeve.