Press working method and press working apparatus

Abstract

The present invention provides a press working apparatus and its manufacturing device. In the press working apparatus 10, while a servo motor 24 is acting, an upper die 38 is made to come close to a lower die 52 and press working of the first time is conducted on a steel plate 12. A slider 32 is raised to a movable punch preparation position. A movable punch 90 is protruded from a die face 38a of the upper die 38 by width H and locked by a mechanical lock 94. The upper die 38 is made to come close to the lower die 52 again and the steel plate 12 is pushed with the upper die 38 and at the same time an additional worked portion 12a is pushed and deformed with the movable punch 90 so as to conduct press working of the second time. After the movable punch 90 has been retracted, the slider 32 is raised.

Description

technical field [0001] The present invention relates to a press working method and press working equipment for pressing a formed product by servo press working. Background technique [0002] In conventional mechanical pressing, pressing is performed while a crankshaft rotation motor drives up and down a slider connected to the crankshaft. In this mechanical pressing, since the die is continuously moved up and down, it is difficult to change the speed of the die according to the processing conditions. In addition, it is also difficult to temporarily stop the mold. [0003] Due to the above circumstances, a servo press that can flexibly control the movement of a mold using a servo motor has recently been used. For this subject, refer to Japanese Patent Laid-Open No. 2001-150200 and Japanese Patent No. 3537287. In this type of servo pressing, the die can be stopped at a predetermined position in the middle of one stroke of the die's up and down motion. [0004] In this rega...

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