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Title:
PRESS FORMING METHOD
Document Type and Number:
WIPO Patent Application WO/2021/141104
Kind Code:
A1
Abstract:
In this press forming method, a formed product which has a hat-shaped cross section, and which is provided with a top surface portion, an outward corner portion, a vertical wall portion, an inward corner portion, and a flange portion, is formed by way of a draw forming step and a restrike forming step. In the draw forming step, an intermediate formed product 8 including a protruding portion 81 corresponding to the outward corner portion, and a recessed portion 83 corresponding to the inward corner portion is formed. The radii of curvature of the protruding portion 81 and the recessed portion 83 are greater than those of the outward corner portion and the inward corner portion, and the cross-sectional shape of the protruding portion 81 is caused to bulge further toward the top surface portion side in a pressing direction F than the outward corner portion. In the restrike forming step, the outward corner portion and the inward corner portion are formed by pushing the protruding portion 81 down in the pressing direction F toward the recessed portion 83 side, while outflow of material outward from the inside and inflow of material inward from the outside are suppressed by restraining a portion of the intermediate formed product 8 inward of the protruding portion 81 and a portion thereof outward of the recessed portion 83.

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Inventors:
OSAWA KAORI (JP)
OKUZUMI SYOHEI (JP)
Application Number:
PCT/JP2021/000436
Publication Date:
July 15, 2021
Filing Date:
January 08, 2021
Export Citation:
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Assignee:
HONDA MOTOR CO LTD (JP)
International Classes:
B21D22/26
Domestic Patent References:
WO2015098871A12015-07-02
Foreign References:
JP6376048B22018-08-22
JP2016203255A2016-12-08
JP2011025263A2011-02-10
Attorney, Agent or Firm:
SHOBAYASHI Masayuki et al. (JP)
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