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Title:
SHEARING METHOD
Document Type and Number:
WIPO Patent Application WO/2018/043730
Kind Code:
A1
Abstract:
The present invention provides a shearing method whereby residual stress is small, a sheared surface having excellent surface properties is formed, and the service life of a punch is increased in a shearing process for shearing, at a shear line that crosses a weld, a work piece in which a steel sheet and another steel sheet are welded, the level difference width of the weld being large and/or the work piece having a strength of 1000 MPa or greater. The shearing method pertaining to the present invention being a method for shearing a work piece having a weld using a punch and a die, wherein the shearing method is characterized in that two protrusions are provided to an edge of the punch, all or a portion of the weld of the work piece is flanked on both sides by the two protrusions, and the work piece is sheared at a shear line that crosses the weld.

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Inventors:
YASUTOMI, Takashi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
SAITO, Masahiro (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
YONEMURA, Shigeru (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
YOSHIDA, Tohru (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2017/031681
Publication Date:
March 08, 2018
Filing Date:
September 01, 2017
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
International Classes:
B23D15/04; B21D28/00; B21D28/34; B23D15/06
Attorney, Agent or Firm:
AOKI, Atsushi et al. (SEIWA PATENT & LAW, Toranomon 37 Mori Bldg. 5-1, Toranomon 3-chome, Minato-k, Tokyo 23, 〒1058423, JP)
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