摘要
基于Duncan方法设计了一种板料成形摩擦系数测试装置,用以考察摩擦圆辊的直径和摩擦包角对摩擦系数计算的影响。正交试验分析表明:随着摩擦圆辊直径和摩擦包角的增大,由板料弯曲和包角边界造成的摩擦系数计算干扰效应将逐级减小,进而计算摩擦系数也逐步减小,并且最终趋向真实摩擦系数。基于最终试验分析结果,得出包角在90°,圆辊直径在30 mm左右时,测得的摩擦系数可以忽略弯曲效应和包角边界效应,能反映真实摩擦状态,可以用于后续的金属板料成形有限元模拟。
A new friction coefficient measuring apparatus which is based on Duncan＇s theroy was designed to test the effect of the friction column diameter and friction angle on the friction coefficient computing. Orthogonal experiments show that with the increase of the friciton column diameter and angle, the effect of disturbance caused by the blank bending and the angle boundary on computing the friction coefficient attenuates gradually, and then the calculated value of friction coefficient also decreases gradually and trends towards the real value finally. Based on the the final experimental results, it is found that when the column diameter is around 30 mm and the angle is around 90°, the effect of distrubance can be ignored and the calculated value of friction coefficient is precise enough to be used in the blank sheet finite element simulation.
出处
《机械科学与技术》
CSCD
北大核心
2008年第3期305-309,共5页
Mechanical Science and Technology for Aerospace Engineering
关键词
板成形
摩擦系数
有限元
sheet metal forming
friction coefficient
finite element simulation
