| 摘要 |
PURPOSE:To eliminate the need for annealing after forming and to mass-produce an accurate press parts by forming at a temperature higher than the annealing temperature of a blank, and finishing a cooling and a setting in a forming die. CONSTITUTION:The metal blank is heated just before the press at a temperature higher than the annealing temperature of the blank by chucking and stretching a specified interval including the pressing zone by electrodes causing an electric current to flow. Then, immediately turning to press, the press working, cooling and setting are simultaneously performed. At this time, the stages from the heating to the press working are conducted in a atmosphere of an inert gas. Furthermore, no temperature and machining to cause a deformation or a residual stress are added on the pressed and set parts. Therefore, the parts are eliminated the need for the annealing after the forming and a resetting to correct the deformation caused by the annealing.
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