Work holder and work machining method

Patent metadata

Field	Value
Publication number	US-10207332-B2
Application number	US-201715659739-A
Country	US
Kind code	B2
Filing date	Jul 26, 2017
Priority date	Jul 29, 2016
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

A work holder includes: a first holding part having three attracting members that are arranged circumferentially apart from each other to attract an axial end face of an annular work; and a second holding part having a contacting member that is held in contact with an inner periphery or outer periphery of the work and restricts radial movement of the work.

First claim

What is claimed is:

1. A work holder comprising:
a first holding part including three attracting members that are arranged circumferentially apart from each other to attract an axial end face of an annular work; and
a second holding part including:
(i) a contacting member that is held in contact with an inner periphery or outer periphery of the work and restricts radial movement of the work; and
(ii) a biasing member configured to apply a biasing force to the contacting member, the biasing force directed toward the work in a radial direction,

wherein the biasing member is an elastic member elastically biasing the contacting member.

2. The work holder according to claim 1 , wherein the second holding part includes a supporting member that supports the contacting member for movement in a radial direction of the work.

3. The work holder according to claim 2 , wherein the second holding part includes a locking member that locks the contacting member radially in position in contact with the inner periphery or the outer periphery of the work.

4. The work holder according to claim 3 , wherein the locking member is actuated by fluid pressure.

5. The work holder according to claim 1 , wherein a central angle between two adjacent attracting members is set to be within a range of 90° to 150°.

6. A work machining method for machining a surface of an annular work using the work holder according to claim 1 , the work machining method comprising:
allowing the three attracting members of the first holding part to attract a first axial end face of the work;
bringing the contacting member of the second holding part into contact with the inner periphery or outer periphery of the work to restrict radial movement of the work and hold the work in position; and
machining a surface of the work.

7. The work holder according to claim 1 , wherein the first holding part includes a magnetic member.

8. The work holder according to claim 7 , wherein the attracting members are configured to become magnetized by being attracted to the magnetic member.

9. The work holder according to claim 1 , wherein the biasing member is a coil spring.

10. The work holder according to claim 1 ,
wherein the second holding part includes a locking member that locks the contacting member radially in position in contact with the inner periphery or the outer periphery of the work, the locking member being actuated by fluid pressure,
wherein the locking member includes a gripping member, and
wherein the locking member is configured to lock the contacting member by pressing the gripping member to the contacting member when the locking member is actuated by the fluid pressure.

Assignees

• Jtekt Corp

Inventors

• Yokoyama Takashi
• Narisawa Masami
• Kuroyanagi Shogo
• Shichiri Yoshinobu

Classifications

• B23B31/223

  Jaws in the form of cylindrical elements · CPC title

• Y10T279/29

  More than one set of gripping means · CPC title

• B23B2260/10

  Magnets · CPC title

• B23B2228/24

  Hard, i.e. after being hardened · CPC title

• B23B31/28 Primary

  using electric or magnetic means in the chuck · CPC title