Induction coil for an inductive shrinking apparatus

Details Induction coil for an inductive shrinking apparatus Induction coil for an inductive shrinking apparatus

2005-05-31

2005-05-31

Walberg, Teresa J. (Department: 3742)

Electric heating

Inductive heating

Metal working

C219S674000, C219S635000

Reexamination Certificate

active

06900418

ABSTRACT:
The induction coil (13) of an arrangement which heats a tool-holder (1) inductively for the purpose of changing a tool shank (11) retained with a press-fit therein has a winding (19), in the case of which the number of coil turns per unit of length in the direction of the coil axis and/or the number of coil turns per unit of surface area is smaller in an intermediate region located, in the direction of the coil axis, between two main winding regions (21, 23) than in the two main winding regions (21, 23) and/or the internal winding diameter is smaller in the two main winding regions (21, 23) than in the intermediate region and/or, at least in an axial sub-region of the induction coil (13), increases from the two main winding regions (21, 23) in the direction of the intermediate region. Such a winding achieves uniform heating of the tool-holder (1) in the axial direction of the tool shank (11) and, accordingly, it is possible even for tool shanks (11) retained with very small tolerances in the press-fit of the tool-holder (1) to be released from the shrink-fit without jamming.

REFERENCES:
patent: 3697715 (1972-10-01), Morris et al.
patent: 2001/0024020 (2001-09-01), Rabe
patent: 254 868 (1948-05-01), None
patent: H 18556lb/7b (1956-09-01), None
patent: 200 08 937 (2000-08-01), None
patent: 199 15 412 (2000-10-01), None
patent: 100 15 074 (2001-09-01), None
patent: WO 00/59676 (2000-10-01), None
Patent Abstracts of Japan, Publication No. 09223573A, dated Aug. 26, 1997.

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