Title:
NITRIDED CUT TAP AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/180845
Kind Code:
A1
Abstract:
Provided is a highly durable cut tap wherein blade chipping and wearing that occur during tapping have been suppressed. In this invention, in a nitriding step P2, under heating, nitrogen atoms contained in the atmosphere gas are diffused from the surface of a tool parent material for a cut tap, to form a nitrogen diffusion layer, and then, in a honing step P3, abrasive particles are collided against a cutting edge portion of the tool parent material for the cut tap, to round the cutting edge portion and eliminate a blade tip. In the cutting edge portion, due to the diffusion from a flank and the diffusion from a face, the nitrogen diffusion layer is formed to be thick, such that the blade tip of the cutting edge portion is of relatively high nitrogen concentration and hardness, and thus, is mechanically brittle. Therefore, eliminating the mechanically brittle blade tip reduces wearing and blade chipping in the cutting edge portion of the cut tap, yielding a tool performance whereby excellent cutting ability can be held over a long period of time.
Inventors:
HISADA TERUYA (JP)
NAKAJIMA TAKAYUKI (JP)
NAKAJIMA TAKAYUKI (JP)
Application Number:
PCT/JP2021/007553
Publication Date:
September 01, 2022
Filing Date:
February 26, 2021
Export Citation:
Assignee:
OSG CORP (JP)
International Classes:
B23G5/06; B23P15/52
Foreign References:
| JP2000005904A | 2000-01-11 | |||
| JPH0938805A | 1997-02-10 | |||
| JP2009066726A | 2009-04-02 | |||
| JP2005082877A | 2005-03-31 |
Attorney, Agent or Firm:
IKEDA Haruyuki et al. (JP)
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