SCREW THREAD MANUFACTURING METHOD AND SCREW THREAD

Title:

SCREW THREAD MANUFACTURING METHOD AND SCREW THREAD

Document Type and Number:

WIPO Patent Application WO/2013/027534

Kind Code:

A1

Abstract:

The removal starting position (8S1) of a first removal process and the four removal starting positions (8S21 - 8S24) in a second removal process are established on an imaginary circle (7I) with a prescribed radius (R) that is inscribed in the apex (7C) of an incomplete thread part (7a). In each removal process, the tip of the threading tool shaves off the apex (7C) of the incomplete thread part (7a) into respective recesses, contacting the imaginary inscribed circle (7I) from the outside (above). The multiple excision surfaces of the apex (7C) are formed in parallel helices (that is, as mutually adjacent helical recesses) from the starting position to the ending position of the incomplete thread part. Points and burrs in the incomplete thread part can thereby be eliminated or reduced without loss of the ability to screw together with a partner thread component (thread part).

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WO/1999/052666	PROCESS FOR MANUFACTURING A CAPTIVE SCREW
JP7135233	Screw Dredging Modules and Screw Dredging Units

Inventors:

SHIMIZU TOSHIYUKI (JP)
KOBAYASHI MASAO (JP)
NISHIWAKI KENJI (JP)
OTANI SEIJI (JP)
NISHIKAWA TAKAYA (JP)
TAKEDA MANABU (JP)

Application Number:

PCT/JP2012/069090

Publication Date:

February 28, 2013

Filing Date:

July 27, 2012

Export Citation:

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Assignee:

RICOH ELEMEX CORP (JP)
SHIMIZU TOSHIYUKI (JP)
KOBAYASHI MASAO (JP)
NISHIWAKI KENJI (JP)
OTANI SEIJI (JP)
NISHIKAWA TAKAYA (JP)
TAKEDA MANABU (JP)

International Classes:

B23G9/00

Foreign References:

JPS6279913A	1987-04-13
JP2003094248A	2003-04-03
JPS5537281A	1980-03-15
JPS6279913A	1987-04-13
JP2003094248A	2003-04-03
JPS6430005A	1989-01-31

Other References: