板料成形过程模具圆角摩擦测试实验装置的研究

Research on tribotest device for testing in die corner zones during sheet metal forming process

板料成形研究中的一个难点是如何采用实验方法定量测定板料成形过程中板料与模具之间的摩擦系数。通过对板料成形时的变形特点进行分析,提出一种新的板料成形过程模具圆角摩擦测试实验方法,并研制出相应的摩擦测试实验装置。该实验装置考虑了板料成形时周向收缩、厚向增厚的变形特点,能够在线测试出室温和加热状态下板料成形过程模具圆角处的摩擦系数。摩擦测试结果表明,所研制的摩擦测试装置具有灵敏度高、可重复性好、使用方便的特点,为深入研究板料成形过程中摩擦系数随工艺参数的变化规律提供了实验手段。

How to measure the frictional coefficient between sheet blank and die quantificationally by experiments is still a problem for the research work on sheet metal forming. After analyzing the deformation behaviors of sheet blank during sheet metal forming process, a new tribotest method was put forward to measure the frictional coefficient in die corner zones and the corresponding tribotest device was designed and produced. The deformation behaviors of circumferential shrinking and thickening were taken into account during sheet metal forming process in the design of device and the developed tribotest device could be used to measure dynamically the frictional coefficient in die corner zones under both room temperature and heated conditions. The tribotest results indicate that the developed tribotest device not only is of high sensitivity, repetitiveness and convenience, but also supplies experimental approach and device to further research on the law of the frictional coefficient varying with the technological parameter in sheet metal forming.