多点成形中的柔性压边技术研究

对于薄板类零件而言,无论是利用整体模具成形还是多点成形,影响成形零件质量的关键因素是起皱。为了防止薄板类零件成形过程中产生起皱,尽量提高薄板类零件的变形量,研制了一种适合于多点成形的新型柔性压边装置,依据成形件的工艺特点、变形大小、材料特性及其弹性模量和成形零件形状,可以确定压边力的大小,且与板料直接接触的柔性压边圈随成形零件的形状不同而有所变形。介绍了多点成形压力机专用的柔性压边装置的工作原理、工作过程、布置结构、力学分析、成形力及压边力的计算。阐述了实际使用过程中的压边力和成形力的调节方法及柔性压边力,实现了数字无级调压,通过调节柔性压边力,明显改善了薄板类零件的成形质量。

A research on the flexible blank-holder in multi-point forming press

For sheet metal forming, whether die or multi-point forming, key factor affecting the quality of forming parts is wrinkling. In order to preventing wrinkling, a new flexible blank-holder set which was bring forward to fit for multi-point forming was studied to heighten deformation in sheet metal forming. Blank-holder force can be confirmed according to technology, deformation, mechanical performance, elastic modulus of sheet metal and forming shape of the part. Flexible blank-holder contacted with sheet metal is distorted with the shape. Calculation for operation principle, forming process,structure disposal, dynamical analysis, forming force and blank-holder force of flexible blank-holder set used specially in multi-point forming press are introduced in this paper. Adjusting methods of forming force and blank-holder force on operating the equipment, flexible blank-holder's adjusting come true stepless, the effect of them on forming part's quality are obvious in virtue of adjusting flexible blank-holder's force.