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Title:
METAL SHEET PUNCHING DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/054360
Kind Code:
A1
Abstract:
A metal sheet punching device 11 according to the present invention comprises: a die 13 for supporting a metal sheet 1; and a punch 15 for forming a circular punched hole 3 in the metal sheet 1 supported by the die 13. The punch 15 comprises: a body part 17; a cylindrical punching part 19; a rotation part 21 disposed so as to be rotatable about, as a rotation axis, the center axis of the punching part 19; a coated abrasive 23 provided on the outer circumferential surface of the rotation part 21; a spring 25 that is disposed between the body part 17 and the punching part 19 so as to be contractible and expandable in a punching direction, that is contracted so as to store elastic energy until the punching part 19 is brought into contact therewith and punches the metal sheet 1, and that is expanded by releasing the stored elastic energy after the punching of the metal sheet 1; and a rotational motion conversion mechanism 27 for converting linear motion of the punching part 19 caused by the expansion of the spring 25 into rotational motion of the rotation part 21.

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Inventors:
YAMAGUCHI NAOKI (JP)
Application Number:
PCT/JP2021/022870
Publication Date:
March 17, 2022
Filing Date:
June 16, 2021
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
B21D28/24; B21D28/34; B23P23/04; B24B5/36
Domestic Patent References:
WO2009125786A12009-10-15
Foreign References:
JP3167826B22001-05-21
JPH11290967A1999-10-26
JP5287548B22013-09-11
JP6749880B22020-09-02
JP2002066653A2002-03-05
JP2009012018A2009-01-22
JP2008137073A2008-06-19
JP2004283875A2004-10-14
Other References:
YOSHITAKE ET AL., PROCEEDINGS OF THE JAPAN SOCIETY OF AUTOMOTIVE ENGINEERS, vol. 33, no. 4, 2002, pages 203 - 208
See also references of EP 4194115A4
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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