Title:
SCREW TAP AND FEMALE SCREW FORMING METHOD
Document Type and Number:
WIPO Patent Application WO/1997/026106
Kind Code:
A1
Abstract:
A screw tap for forming a female screw in a workpiece, and a female screw forming method. A screw tap (1) formed so that a bottom portion (4) between crests (3, 3) contacts crest portions (22a) of a female screw (22), which is formed in a workpiece (20), with substantially no space left between the valley portion (4) and the ridge portions (22a). A female screw is formed in a workpiece by using such a screw tap (1), whereby a female screw having no burrs at both corner portions of a crest surface of a screw thread can be formed.
Inventors:
UEDA KAZUO (JP)
Application Number:
PCT/JP1996/000057
Publication Date:
July 24, 1997
Filing Date:
January 16, 1996
Export Citation:
Assignee:
DAISHOWA SEIKI (JP)
UEDA KAZUO (JP)
UEDA KAZUO (JP)
International Classes:
B23G5/06; (IPC1-7): B23G5/06
Foreign References:
| JPS63182827U | 1988-11-25 | |||
| JPS5343297U | 1978-04-13 |
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