| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing an object having a closed cross sectional shape by a hot working press, which method can manufacture a formed object having a nearly or completely closed hollow cross sectional shape while allowing the best use of merits of the hot press forming to simultaneously carry out the shaping and quenching to a metal plate. SOLUTION: The metal plate M having a first formed portion M1 and a second formed portion M2 is prepared, and is heated to a temperature capable of quenching. First, a primarily formed item having an opened cross sectional shape given to the first formed portion M1 is achieved by press-forming the first formed portion M1 at a temperature capable of quenching using a first press die mechanism held at a low temperature, and is quenched at the same time. Next, a secondarily formed item having a hollow closed cross sectional shape formed by the second formed portion M2 bent from the opened cross sectional shape of the primarily formed item is achieved by bending the second formed portion M2 at a temperature capable of quenching by press-forming using a second press die mechanism held at a low temperature, and is quenched at the same time. COPYRIGHT: (C)2007,JPO&INPIT
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