Title:
METHOD FOR MANUFACTURING LAYERED HOT STAMPING MOLDED BODY AND LAYERED HOT STAMPING MOLDED BODY
Document Type and Number:
WIPO Patent Application WO/2021/172379
Kind Code:
A1
Abstract:
[Problem] To solve a problem related to the bending of a steel sheet caused by a difference in a temperature increase rate between a layered part and a sheet part. [Solution] The present manufacturing method comprises: a step for heating a layered blank; a step for transporting the heated layered blank; and a step for pressing the heated layered blank into a mold. In the heating step, when the thicknesses of first and second steel plates are set as t1 and t2, and average heating rates at a plate temperature between 20 °C to 800 °C in a portion of the total plate thickness (t1+t2) of the layered part and a portion of a non-layered part are set as V and v1, the total plate thickness (t1+t2) is 2.5-5.0 mm, and the maximum length L of the layered part is 100-1100 mm. An area S1 of the first steel plate, an area S2 of a portion of the second steel plate overlapping the first steel plate, and the average heating rates V1, v1 satisfy expressions (1) to (3), and heating is performed at a heating temperature and a heating time within a specific range in a coordinate plane defined by the heating time and the heating temperature.
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Inventors:
FUJITA SOSHI (JP)
SUZUKI YUKI (JP)
FUDA MASAHIRO (JP)
IRIKAWA HIDEAKI (JP)
MAKI JUN (JP)
YOSHIKAWA NOBUO (JP)
NOMURA NARUHIKO (JP)
SUZUKI YUKI (JP)
FUDA MASAHIRO (JP)
IRIKAWA HIDEAKI (JP)
MAKI JUN (JP)
YOSHIKAWA NOBUO (JP)
NOMURA NARUHIKO (JP)
Application Number:
PCT/JP2021/006928
Publication Date:
September 02, 2021
Filing Date:
February 24, 2021
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B21D22/20; B21D24/00; C21D1/18; C21D9/00; C22C38/00; C22C38/60
Domestic Patent References:
| WO2002103073A2 | 2002-12-27 | |||
| WO2008053273A1 | 2008-05-08 |
Foreign References:
| JP6642777B1 | 2020-02-12 | |||
| JP6451327B2 | 2019-01-16 | |||
| JP5509337B2 | 2014-06-04 | |||
| JP2016112569A | 2016-06-23 | |||
| JP2016124029A | 2016-07-11 |
Other References:
See also references of EP 4082687A4
Attorney, Agent or Firm:
HAGIWARA, Yasushi et al. (JP)
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