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1. (WO2018088457) HOLDER FOR TOOL BIT WITH EXCHANGEABLE CUTTING EDGE AND SET OF HOLDER FOR TOOL BIT WITH EXCHANGEABLE CUTTING EDGE AND WRENCH

Pub. No.:    WO/2018/088457    International Application No.:    PCT/JP2017/040357
Publication Date: Fri May 18 01:59:59 CEST 2018 International Filing Date: Fri Nov 10 00:59:59 CET 2017
IPC: B23B 27/16
B23B 27/04
Applicants: MITSUBISHI MATERIALS CORPORATION
三菱マテリアル株式会社
Inventors: KISO Takuma
木曽 拓真
WATANABE Shoichiro
渡辺 彰一郎
Title: HOLDER FOR TOOL BIT WITH EXCHANGEABLE CUTTING EDGE AND SET OF HOLDER FOR TOOL BIT WITH EXCHANGEABLE CUTTING EDGE AND WRENCH
Abstract:
The present invention enables a holder body to be used over a long period of time without being immediately discarded when wear occurs as a result of repeated attaching and detaching of cutting inserts. At an insert attachment section 2 of a holder body 1, the side where a seating surface 3A of an insert attachment seat 3 is formed constitutes a lower jaw part 2B, and the side where a pressing surface 3B is formed constitutes an upper jaw part 2A which can be elastically deformed in a direction away from the lower jaw part 2B. At the upper jaw part 2A, an upper-jaw-side recessed surface 5A is formed on the upper-jaw-side inner surface 4A of a slit 4 of the holder body 1 located rearward of the pressing surface 3B, the upper-jaw-side recessed surface being formed in a semi-oval arc-like shape having a major axis in the direction in which the slit 4 extends when viewed from the plate thickness direction of the holder body 1 and being recessed from the upper-jaw-side inner surface 4A. The lower jaw part 2B has formed thereon multiple lower-jaw-side recessed surfaces 5B, 6A recessed in an arc-like shape with respect to the upper-jaw-side recessed surface 5A when viewed from the plate thickness direction.