| 摘要 |
<p>The induction coil of a device that inductively heats a toolholder (1) to facilitate a change of tools comprises a shielding collar (27) consisting of a magnetisable material. Said collar concentrates the magnetic flux of the induction coil (13) into a sleeve section (5) of the toolholder (1), which retains the shaft (11) of a rotational tool by a clamping force and shields the part of the tool shaft (11) that projects from the sleeve base (5), to facilitate the unclamping of the tool from the toolholder (1). The shielding collar (27) has, on the side that axially faces the winding (19) of the induction coil (13), an outer surface (31) that extends conically away from the sleeve base (5) and an axial height (h), which is at least 1.5 times greater than the diameter (d) of the tool shaft (11). All sides of the shielding collar (27) run at a distance from a magnet yoke (23) consisting of magnetisable material, which surrounds the winding (19) of the induction coil (13).</p> |
