Title:
MACHINING DEVICE, CERAMIC BALL AND ROLLING BEARING
Document Type and Number:
Japanese Patent JP2022053267
Kind Code:
A
Abstract:
To provide a machining device that can suppress cracking of plurality of green balls having diameters different from each other in an initial state, during polishing, even when using a special technique not employing a bonding material, and to provide a ceramic ball formed by the machining device, and a rolling bearing.SOLUTION: A machining device 1 comprises: a first surface plate 10; a first shaft 12; a second surface plate 20 including a holding portion 20B; a second shaft 22; a polishing layer 11; and a first elastic member 50. The first surface plate 10 includes a first surface 10c that contacts and holds a green ball 91. The first shaft 12 rotates the first surface plate 10 around an axis α. The second surface plate 20 includes a second surface 20c that opposes to the first surface 10c and contacts and holds the green ball 91, and includes the holding portion 20B that extends to protrude in a direction crossing the second surface 20c and surrounds the green ball 91. The second shaft 22 rotates the second surface plate 20 around an axis β. The polishing layer 11 polishes the green ball 91 by contacting the green ball 91. The first elastic member 50 is arranged in an inner wall portion of the holding portion 20B of the second surface plate 20.SELECTED DRAWING: Figure 1
Inventors:
SATO NORIHIDE
NAKAMURA FUMIYA
NAKAMURA FUMIYA
Application Number:
JP2020160008A
Publication Date:
April 05, 2022
Filing Date:
September 24, 2020
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD
International Classes:
B24B11/06; B24B55/06; B28B11/08; C04B35/587; F16C33/32
Attorney, Agent or Firm:
Fukami patent office
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