COLD FORMING TAP WITH INSIDE DIAMETER FINISH BLADE AND METHOD OF MANUFACTURING SAME

Title:

COLD FORMING TAP WITH INSIDE DIAMETER FINISH BLADE AND METHOD OF MANUFACTURING SAME

Document Type and Number:

WIPO Patent Application WO/1999/003631

Kind Code:

A1

Abstract:

In a cold forming tap of the embodiment, those projections, which constitute a part of the projections and are axially adjacent to one another, are removed to valley bottoms, and cutting blades, a diametrical dimension of which corresponds to a thread inside diameter of a female thread that should have been formed at portions corresponding to the valley bottoms of the removed projections, are formed. In manufacturing the cold forming tap, a maximum diameter of a valley bottom is not formed in relief portions contiguous to projections of male thread portions but concave and convex configurations of peaks and valleys are in synchronism with one another in a circumferential direction, so that peaks and valleys of the male threads can be efficiently formed at one time with high precision in a processing called a thread grinding, in which grinding is carried out by a grinding stone formed at its outer peripheral surface with threads, and a dimensional management of the male threads is made much easy to enable easy and inexpensive manufacture of high-precision cold forming taps.

Inventors:

SUGANO HIROTO (JP)
HAYASHI SHIGERU (JP)
MINAGAWA KAZUMITSU (JP)

Application Number:

PCT/JP1997/002473

Publication Date:

January 28, 1999

Filing Date:

July 16, 1997

Export Citation:

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Assignee:

OSG CORP (JP)
SUGANO HIROTO (JP)
HAYASHI SHIGERU (JP)
MINAGAWA KAZUMITSU (JP)

International Classes:

B23G7/02; (IPC1-7): B23G5/06; B23G1/38

Foreign References:

JPH02106219A	1990-04-18
JPH023325U	1990-01-10
JPH0388627U	1991-09-10
JPS61144916U	1986-09-06

Other References: