| 摘要 |
Method for folding a metal sheet (2) to a well-defined angle (Dw), in which the sheet (2) is deformed in a recess of a die (3) through a pressure means (1) being moved above the recess (31), pressing on the sheet (2), towards the die (3), until it reaches a well-defined end position (Ya), characterized in that the movement of the pressure means is regulated as a function of the folding force and of the folding angle in order, on the one hand, to obtain a well-defined angle before the spring-back of the sheet (2) and, on the other hand, to compensate for the spring-back of the sheet, so that after the spring-back the desired angle (Dw) is obtained, the pressure means (1) being moved in the direction of the die (3) until it is in an end position (Ya) which is calculated during the folding process according to the formula: Ya = Yt - dYw - dYr in which Yt is the theoretically calculated correct position for the pressure means, dYw is the correction of the position of the pressure means (1) which is necessary for obtaining the well-defined angle (Dw) before the spring-back of the sheet (2), and dYr is the correction of the position of the pressure means (1) which is necessary to compensate for the spring-back of the sheet (2). <IMAGE>
|
