COLLET CHUCK, CHUCK DEVICE, AND METHOD FOR MANUFACTURING MACHINED PRODUCT

WIPO Patent Application WO/2015/155827

A1

The present invention improves shape accuracy of a machined product by preventing shifting of gripping position in an axial direction, thereby achieving a reduction in the rate of defects. This collet chuck (10) is equipped with a cylindrical main collet (11) and a cylindrical secondary collet (12) that is disposed on the inner periphery side of the main collet (11) so as to be movable in the axial direction with respect to the main collet (11). The main collet (11) has multiple slits (11a) that extend in the axial direction, a surface to be pressed (11b) that is provided on the outer periphery of the main collet and formed into a tapered shape or a reverse-tapered shape toward one side in the axial direction, said surface to be pressed being a surface to which a pressure for increasing/decreasing the inner diameter of the main collet (11) is applied, and a main-side inclined surface (11c) that is provided on the inner periphery and formed into a reverse-tapered shape obliquely inclined toward the tip side in the axial direction. The secondary collet (12) has multiple slits (12a) that extend in the axial direction, a gripping surface (12b) that is provided on the inner periphery of the secondary collet and grips a member to gripped, and a secondary-side inclined surface (12c) that is provided on the outer periphery and formed into a reverse-tapered shape for making contact with the main-side inclined surface.

KIM MONG JOO (KR)
OGUCHI YUJI (JP)

PCT/JP2014/060139

October 15, 2015

April 08, 2014

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DAIYA SEIKI CO LTD (JP)

B23B31/20

US3874688A	1975-04-01
JPS6229206U	1987-02-21
JPS60161506U	1985-10-26
JP2009000786A	2009-01-08

SAEGUSA HIROAKI (JP)
Hiroaki Saegusa (JP)

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