| 摘要 |
PROBLEM TO BE SOLVED: To detect the fluctuation factor of the machining precision of a product, which occurs during forming, and to maintain the forming precision of the product by correcting the fluctuation factor immediately during the forming. SOLUTION: By detecting a touch point where a punch 10 has been abutted on a material 11 when a slide 9 has been lowered by the rise of the current of the servomotor of the servo press, and also detecting the position of the slide 9 at that time by a scale detector, a distance between the slide and the material is calculated. And, by judging that an elongationΔt caused by the thermal expansion of the punch 10 has generated, and by correcting the bottom dead point of the slide 9 byΔt during the forming, the forming precision is maintained.
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