METHOD FOR PRODUCING PRESS-FORMED PRODUCT
First Claim
1. A method for producing a formed product by press-forming a thin steel sheet with a punch and a die, comprising:
- heating the thin steel sheet to a temperature not lower than an Ac3 transformation point thereof; and
then starting the press-forming,wherein the forming is carried out so that a temperature difference in the thin steel sheet is adjusted to be not higher than 200°
C. at a stage when the thin steel sheet has reached one third of a forming height.
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Abstract
There is provided a useful method for producing a press-formed product without making the structure of a press tool complicated, which product has favorable formability in a level so as to be able to be produced by deep drawing, and which product is produced by press-forming a thin steel sheet with a punch and a die, in which the thin steel sheet is heated to a temperature not lower than an Ac3 transformation point thereof, and the press-forming is then started, wherein the forming is carried out so that a temperature difference in the thin steel sheet is adjusted to be not higher than 200° C. at a stage when the thin steel sheet has reached one third of a forming height.
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Citations
6 Claims
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1. A method for producing a formed product by press-forming a thin steel sheet with a punch and a die, comprising:
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heating the thin steel sheet to a temperature not lower than an Ac3 transformation point thereof; and then starting the press-forming, wherein the forming is carried out so that a temperature difference in the thin steel sheet is adjusted to be not higher than 200°
C. at a stage when the thin steel sheet has reached one third of a forming height. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification