Title:
METHOD FOR IMPROVING FATIGUE STRENGTH AND MAGNETIC CHARACTERISTIC IN PUNCHING PART OF MAGNETIC STEEL SHEET
Document Type and Number:
Japanese Patent JP2007277650
Kind Code:
A
Abstract:
To stably obtain a worked part improving both of fatigue characteristic and magnetic characteristic by applying an ultrasonic striking treatment to the worked part of a magnetic steel sheet.
The method for improving the fatigue strength and the magnetic characteristic in the worked edge part of the magnetic steel sheet, is performed as the followings, that is, the ultrasonic striking treatment is applied to the corner part of the edge surface generated with a punching work of the magnetic steel sheet and the back surface and/or the front surface in the range of the sheet thickness size or more from this edge surface.
COPYRIGHT: (C)2008,JPO&INPIT
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Inventors:
SETO KOJI
Application Number:
JP2006106399A
Publication Date:
October 25, 2007
Filing Date:
April 07, 2006
Export Citation:
Assignee:
NIPPON STEEL CORP
International Classes:
C21D7/02; C21D1/04; C21D8/12; H01F1/16
Domestic Patent References:
| JP2004115856A | 2004-04-15 | |||
| JPH10318410A | 1998-12-04 | |||
| JPH03257121A | 1991-11-15 |
Attorney, Agent or Firm:
Atsushi Aoki
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Nagasaka Tomoyasu
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Nagasaka Tomoyasu
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