| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a warm press-forming method by which a panel dimensional accuracy can be improved by suppressing a shape change such as spring back and press formability also can be improved, and further desired mechanical characteristic of a press-formed article can be easily acquired.SOLUTION: When a steel plate with a tensile strength of 440 MPa or more is formed into a press-formed article having a flange part, the steel plate is heated up to a temperature range of 400°C or more and Acor less and formed with a press machine that is a combination of a punch and a die, at this time, a punch metal mold and a die metal mold are used which are prepared by embedding materials having a thermal conductivity lower than that of the steel plate respectively into the shoulders of a punch metal mold and of a die metal mold, the shoulders causing the steel plate to be deformed by coming in contact with the steel plate.</p> |
