PUNCHING METHOD, PUNCHING DEVICE, AND METHOD FOR MANUFACTURING LAMINATED CORE

Title:

PUNCHING METHOD, PUNCHING DEVICE, AND METHOD FOR MANUFACTURING LAMINATED CORE

Document Type and Number:

WIPO Patent Application WO/2016/114212

Kind Code:

A1

Abstract:

The thickness of an electromagnetic steel sheet is set to be no more than 0.35 mm, Vickers hardness (1 kg test force) to be 150-400, and mean crystal grain diameter to be 50-250 µm. Clearance a for a die 3 is set to be at least 7% of the minimum thickness of the thicknesses of multiple electromagnetic steel sheets and not more than 7% of the total thickness of the multiple electromagnetic steel sheets. The pressing force exerted by sheet pressers 8 of the die 3 on the electromagnetic steel sheets is set to be at least 0.10 MPa. Under conditions in which all of said conditions are satisfied, the stacked multiple electromagnetic steel sheets are punched simultaneously with the die 3.

Inventors:

SENDA KUNIHIRO (JP)
UESAKA MASANORI (JP)
ODA YOSHIHIKO (JP)

Application Number:

PCT/JP2016/050323

Publication Date:

July 21, 2016

Filing Date:

January 07, 2016

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

B21D28/02; C22C38/00; C22C38/06; H01F41/02; C22C38/60; H01F1/16

Foreign References:

JP2003153503A	2003-05-23
JPH07201551A	1995-08-04
JP2003213385A	2003-07-30
JP2001059145A	2001-03-06
JPS60106947A	1985-06-12
JPS60152323A	1985-08-10

Other References: