To complete a heating treatment of a tool holder in a short time and to miniaturize the device itself for being provided at a low cost, in a shrinkage fitting device having a shank part of cutter fitted on a hole part of the tool holder with shrinkage fitting by induction heating.
In an induction heating shrinkage fitting device having a coil 1 charged with an alternating current for heating a tool holder 2 by an induction current generated thereby to fix a shank part of a cutter 3 to its hole part by shrinkage fitting, the coil 1 is formed with a pair of coils 1a and 1b coiled on a cylindrical or prismatic core for having the pair of coils 1a and 1b arranged justifiably opposite a side face of the tool holder 2 to charge the coils 1a and 1b with the current such that magnetic flux generated by the coils 1a and 1b is always kept in the same direction for heating the shank part of the cutter 3. A temperature near a part heated by the coils 1a and 1b of the tool holder 2 is detected by an infrared temperature detecting means 14.
KONNO HIROSHI
OTOMO HIROSHI
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