Method of producing press-formed product
AssigneeNippon Steel Corporation
InventorsYoshiaki Nakazawa, Naruhiko Nomura, Toshiya Suzuki, Masahiro Kubo, Yasuhiro Ito
Life of this patent
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Abstract
A method of producing a press-formed product includes a steel plate heating step, a hot forging step and a hot stamping step. In the steel plate heating step, a steel plate is heated to 950° C. or more. In the hot forging step, the heated steel plate is forged to form a varying-thickness steel plate. In the hot stamping step, the heated varying-thickness steel plate is subjected to press-working by a press tooling to form a press-formed product, and the press-formed product that is formed is cooled inside the press tooling. Thus, a press-formed product that has high strength and for which a reduction in weight is possible can be produced.
Claims5
A method of producing a press-formed product, comprising:
- heating a steel plate to 950° C. or more,
- forging the steel plate using a first press apparatus to form a varying-thickness steel plate,
- water cooling the varying-thickness steel plate,
- heating the varying-thickness steel plate to a temperature that is not less than an Ac3 transformation point and not more than an Ac3 transformation point+150° C., and
- using a second press apparatus different from the first press apparatus, forming the varying-thickness steel plate into a press-formed product by means of a press tooling of the second press apparatus, and cooling the press-formed product inside the press tooling.
Dependencies are inferred from the claim text.