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1. (WO2013124981) CUT TAP

Pub. No.:    WO/2013/124981    International Application No.:    PCT/JP2012/054254
Publication Date: Fri Aug 30 01:59:59 CEST 2013 International Filing Date: Thu Feb 23 00:59:59 CET 2012
IPC: B23G 5/06
Applicants: SAKAI THREADING TOOL CO., LTD.
酒井精工株式会社
HACHIUMA Yoshio
八馬 芳雄
YAMAGUCHI Hitoshi
山口 仁史
Inventors: HACHIUMA Yoshio
八馬 芳雄
YAMAGUCHI Hitoshi
山口 仁史
Title: CUT TAP
Abstract:
A cut tap is provided which is able to form high-precision threading safely. The cut tap has a biting section (1) comprising a plurality of threads (10) formed so that the outer diameter of the threads becomes smaller moving forward in the axial direction and a complete thread section (2) comprising a plurality of threads (20) having a constant outer diameter in the axial direction. In this cut tap, the complete thread section (2) comprises a valley floor same-diameter section (2A) of threads (20A) whose effective diameter (d2) and valley diameter (d1) relative to the threads (10) of the biting section (1) are the same, and a valley floor large-diameter section (2B) provided continuously to the rear of the valley floor same-diameter section (2A) in the axial direction whose threads (20B) have an effective diameter (d2) that is the same as the threads (10) of the biting section (1) but have a valley diameter (d1') that is larger. The cutting edge (6) is formed in the valley floor portion of the valley floor large-diameter section (2B) on the forward edge in the direction of rotation.