THREAD FORMING TAP

WIPO Patent Application WO/2024/004890

A1

A thread forming tap (1) comprises a male thread (3), a groove, and an inner-diameter finishing tooth (61). A lead-in section (31) of the male thread (3) is provided so as to be continuous with a complete thread section (32) and decreases in diameter toward the tip. The groove is provided parallel to the axis across the complete thread section (32) and the lead-in section (31) so as to divide the thread ridges (71) of the male thread (3). The inner-diameter finishing tooth (61) is provided along the open end of the groove on the opposite side from the direction of rotation of the thread forming tap (1) in the lead-in section (31) and the complete thread section (32). The inner-diameter finishing tooth (61) shaves and removes the top part of the thread ridges of a female thread formed in a surface layer of a pilot hole (90). The height of a first-stage finishing tooth (611) of the inner-diameter finishing tooth (61) in the lead-in section (31) is lower than the height of a second-stage finishing tooth (612) of the inner-diameter finishing tooth (61) formed in a part corresponding to the thread ridge (71) at the leading edge in the complete thread section (32).

JPS62114818	METHOD AND DEVICE FOR MANUFACTURING SCREW
JP2004314231	THREAD FORMING TAP
JP7018136	Excitement tap

ANDO HARUYASU (JP)

PCT/JP2023/023449

January 04, 2024

June 26, 2023

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OSG CORP (JP)

B23G7/02; B23G5/06

WO2009116178A1

2009-09-24

JPH09216126A	1997-08-19
JPH11309624A	1999-11-09
JPH1119825A	1999-01-26
JPH0295513A	1990-04-06
JPH0942255A	1997-02-10

YAMAMOTO, Hisashi et al. (JP)

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