| 摘要 |
PCT No. PCT/BE94/00052 Sec. 371 Date Jun. 24, 1996 Sec. 102(e) Date Jun. 24, 1996 PCT Filed Aug. 26, 1994 PCT Pub. No. WO95/05905 PCT Pub. Date Mar. 2, 1995A method and device for folding a metal sheet to a well-defined angle, in which the sheet is deformed in the recess of a die through a punch being moved above the recess and pressing on the sheet, towards the die, until it reaches a well-defined end position. The movement of the punch is regulated as a function of the folding force and of the folding angle. The punch is moved in the direction of the die until it is in an end position Ya corresponding to: Ya=Yt-dYw-dYr in which Yt is a calculated position, dYw is determined through extrapolation of the course of the folding angle as a function of the position of the punch, and dYr is the correction of the position of the punch which is necessary to compensate for the spring-back of the sheet.
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