US 6,712,367 B1Granted

Device for clamping tools

AssigneeInnovat - Gesellschaft fuer Sondermaschinenbau Messund Steuertechnik mbH and Bilz Werkzeugfabrik GmbH & Co. KG

InventorsIngo Irion, Michael Voss

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Abstract

The invention is concerned with a device for clamping and releasing work tools (16) in a tool receptacle (10). The tool receptacle (10) includes on its free end for this purpose an open socket part (12), which is adapted for frictional engaging reception of the work tool shaft (14). The work tool shaft is thereby shrunk-fit into a borehole (20) in the socket part (12). For this purpose the socket part is provided with an induction coil (26) encircling the tool receptacle (10) which coil can be acted upon by high frequency alternating current for producing heat and heating the socket part (12). For avoidance of leakage fields which could result in a undesired heating of the work tool (16), it is proposed in accordance with the invention that the induction coil (26), on its surface adjacent the free end of the socket part (12), is covered over by a pole shoe (34) having a central through hole (36) for the work tool (16) and comprised of a magnetically conductive and electrically non-conductive material.

Claims25

Dependent claims

A device for clamping and releasing a work tool (16) in a work tool receptacle, the work tool having a work tool shaft (14), the device including:

the work tool receptacle (10) including a socket part (12) open on its free end (24) and comprising electrically conductive material adapted for frictionally engaging reception of the tool shaft (14), and
an induction coil (26) in the form of a ring or cylindrical coil being bordered by a circumferential ring surface on its free end adjacent the free end of the socket part, and having a surface opposite the free end of the socket part, and an outer surface, said induction coil encircling the socket part (12) of the tool receptacle (10) and being adapted for heating the socket part (12) when energized with high frequency alternating current,
wherein the induction coil (26) adjacent the free end of the socket part (12) is closed off by a pole shoe (34) exhibiting a central through-hole (36) for the tool (16) and comprised of a magnetically conductive and electrically insulating material,
wherein the pole shoe (34) partially overlaps and lies axially and/or radially against the free end (24) of the socket part (12) and borders to the work tool shaft (14) with a magnetic resistance increasing air gap (40).

1 more element

Dependencies are inferred from the claim text.