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Title:
METHOD FOR HEATING STEEL PLATE AND METHOD FOR MANUFACTURING HOT-PRESSED PRODUCT
Document Type and Number:
WIPO Patent Application WO/2019/142783
Kind Code:
A1
Abstract:
A steel plate to be heated is a blank having a first region and a second region adjacent to the first region. The blank is heated by direct resistance heating. A jet of cooling medium is applied to the first region during the direct resistance heating such that a temperature of the first region is kept lower than a quenching region while heating the second region to be equal to or higher than the quenching temperature. To provide a clear boundary between the first and second regions, the jet of cooling medium is applied along a slant direction such that the cooling medium expands along the boundary between the first and second regions. Alternatively, a partition member is provided along the boundary between the first and second regions. The heated blank is then press-formed and cooled in a press die to obtain a hot-pressed product.

Inventors:
OOYAMA Hironori (17-1, Higashi-gotanda 2-chome, Shinagawa-k, Tokyo 39, 〒1418639, JP)
HOSOGI Maho (17-1, Higashi-gotanda 2-chome, Shinagawa-k, Tokyo 39, 〒1418639, JP)
TANAKA Hirotaka (17-1, Higashi-gotanda 2-chome, Shinagawa-k, Tokyo 39, 〒1418639, JP)
Application Number:
JP2019/000926
Publication Date:
July 25, 2019
Filing Date:
January 15, 2019
Export Citation:
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Assignee:
NETUREN CO., LTD. (17-1, Higashi-gotanda 2-chome Shinagawa-k, Tokyo 39, 〒1418639, JP)
International Classes:
B21D37/16; C21D1/40; C21D1/673
Domestic Patent References:
WO2010089644A12010-08-12
WO2010084864A12010-07-29
Foreign References:
EP3004402A12016-04-13
CA2987500A12016-12-08
JP6173873B22017-08-02
US20170037489A12017-02-09
US6903296B22005-06-07
JP2018005098A2018-01-11
JP2018005099A2018-01-11
Attorney, Agent or Firm:
KOH-EI PATENT FIRM, P.C. (Toranomon East Bldg. 9F, 7-13 Nishi-Shimbashi 1-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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