Press-molded article, and method and equipment line for manufacturing press-molded article
A manufacturing method and a technology for a molded product, which are applied in the field of manufacturing the stamped product and the stamped product with a bent portion, can solve the problems of reduced impact energy absorption performance, cracked steel plate 1, reduced rigidity of skeleton members and walking accessories, etc. The effect of crack suppression
Active Publication Date: 2017-09-26
NIPPON STEEL CORP
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Problems solved by technology
Therefore, when the bending radius of the bent portion 5 of the press-formed product 2 is designed to be small, the steel plate 1 is cracked.
On the other hand, when the bending radius of the bending portion 5 of the press-formed product 2 is designed to be large, the rigidity of the frame member and the running parts will decrease, and the impact energy absorption performance will decrease.
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[0143] molded Figure 3A Analysis of stamped products with hat-shaped cross-sections shown. In this analysis, general-purpose structural analysis software LS-DYNA was used. As Comparative Example 1, by the Figure 1A In the conventional bending method shown, the No. 1 press-formed product was formed. In the molding of No. 1, R / t in the press working of only one process was set to 1.07.
[0144] As Comparative Example 2, by the Figure 2A and Figure 2B In the bending method of Patent Document 1 shown, press-formed products Nos. 2, 4, and 6 are formed. In any one of Nos. 2, 4, and 6, R / t in the press working in the second step was set to 1.07. R / t in the press working in the first step was set to 1.42 in No. 2, 2.14 in No. 4, and 2.85 in No. 6.
[0145] As an example of the present invention, press-formed products of Nos. 3, 5, and 7 were molded by the manufacturing method of this embodiment. For any of Nos. 3, 5, and 7, R / t in the press working in the second step was se...
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Abstract
The method for manufacturing a press-molded article according to the present invention, the press-molded article being provided with a pair of flat sections and a bend section connecting the flat sections, the bend radius of the bend section being R2 (mm) and the interior angle formed by the pair of flat sections being theta 2 (degree), includes a preparation step, a first molding step, and a second molding step. In the preparation step, a metal plate having a tensile strength of 590 MPa or greater is prepared. In the first molding step, an intermediate molded article (36) provided with a bend section having a bend radius of R1 (mm) and an interior angle of theta 1 (degree) is molded. In the second molding step, a portion of a bend section (36c) of the intermediate molded article (36) is molded into the bend section of the press-molded article. The bend radius R1, the interior angle theta 1, the bend radius R2, and the interior angle theta 2 satisfy the conditions of expressions (1)-(3). (1): 1.05 < A1 / A2. (2): 1.0 < R2 / R2. (3): A1 / A2 < 6.0 / (R1 / R2). In the above expressions, A1 (degree) is the angle supplementary to the interior angle theta 1 of the intermediate molded article, and A2 (degree) is the angle supplementary to the interior angle theta 2 of the press-molded article.
Description
technical field [0001] The present invention relates to press-formed products used for automobiles, various vehicles other than automobiles, general machinery, ships, etc., and particularly relates to a press-formed product having a curved portion, and a method and equipment for manufacturing the press-formed product. Background technique [0002] Stamped products with curved parts are used, for example, as frame members of automobile bodies (example: beams, side sills, side sills, pillars, etc.), and various parts of automobiles (example: door anti-collision beams, toe control links pole, suspension arm, etc.). The press-formed product is obtained by bending a steel plate as a raw material by pressing. In recent years, in order to protect the global environment, fuel efficiency has been improved, and safety at the time of collision has also been improved. Therefore, for press-formed products, thinning using high-strength steel sheets is advancing. However, there is a con...
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IPC IPC(8): B21D22/26B21D5/01B21D22/20
CPCB21D22/26B21D5/0209B21D24/005B21D5/01B21D53/88
Inventor 大塚研一郎中泽嘉明西村隆一斋藤雅宽
Owner NIPPON STEEL CORP