Patent ID: 6822206
Filing Date: 2004-11-23
Classification: B23P,H05B

Abstract:
A device for the inductive heating of a sleeve section (5) of a toolholder (1) which contains a central balding opening (9) for a shaft (11) of a rotary tool, said toolholder holding the shaft (11) of the tool seated in the holding opening (9) with a press fit and releasing it when heated, comprising:a) an induction coil (13), which encloses the sleeve section (5) of the toolholder (1) annularly with a radial spacing for the heating; b) a generator (17) that feeds the induction coil (13) with electric current of periodically changing amplitude; and c) a ring element (27), enclosing the shaft (11) of the tool close to the tool-side end of the sleeve section (5) of the toolholder (1) and made of a magnetizable material that concentrates the magnetic flux, the ring element (27), in the region of its smallest diameter, being closely adjacent to the tool-side end of the sleeve section (5), wherein the surface (31) of the ring element (27) which faces the interior of the induction coil (13) axially, at least in a subregion, extends radially between the outer circumference of the tool-side end of the sleeve section (5) and the inner circumference of the induction coil (13) and axially obliquely radially outward away from the end of the sleeve section (5).