ボールねじ用ナットの製造方法及びボールねじ

Japanese Patent JP5708638

B2

There is provided a method for forming a concave constituting a ball return passage directly on an inner circumferential surface of a nut blank by plastic working without damaging a die, even in a case where a nut having a long axial dimension and a small diameter is manufactured. Letter S shaped concaves (15, 16) are formed on an inner circumferential surface (11) of a nut blank (1), by a pressing method by use of a die having a blank holder (2), a cam driver (6), cam sliders (7, 8), and a cylindrical member (5). The cam driver (6) has inclined surfaces (61b, 61d) having the same angle of inclination with inclined surfaces (71, 81) of cam sliders (7, 8). The cam sliders (7, 8) have letter S shaped convexes (73, 83) corresponding to the letter S shaped concaves (15, 16), ad are held by through holes (52, 53), respectively. When the cam driver (6) is pressed under pressure from the top thereof, the cam sliders (7, 8) move outwardly in the radial direction, respectively, and the letter S shaped convexes (73, 83) push the inner circumferential surface (11) of the nut blank (1) for plastic deformation.

Atsushi Watanabe
Toru Harada
Yokoyama Shoji
Kiyoshi Otsuka
Koji Hashimoto
Ichito Kobayashi
Nakamura Toshio
Shinobu Mogi
Shingo Saito
Satoshi Yamashita

JP2012508105A

April 30, 2015

March 31, 2011

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Nippon Seiko Co., Ltd.

B21J5/02; B21K21/16; B21K1/70; F16H25/22; F16H25/24

JPH0857563A	1996-03-05
JP2006144873A	2006-06-08
JP2008281063A	2008-11-20
JPH0857563A	1996-03-05
JP2003207015A	2003-07-25
JP2005076844A	2005-03-24
JP2006144873A	2006-06-08

Tetsuya Mori
Megumi Konishi
Hide Tanaka Tetsu
Ichi Hirose
Toru Miyasaka

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