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板料成形过程中,摩擦特性直接影响成形件的质量。通过分析边界润滑状态和流体润滑状态的金属镀层板料受力情况,建立了一个混合润滑状态下关于润滑油膜厚度和滑动速度的摩擦模型。采用平板滑动摩擦实验研究了润滑油膜厚度和滑动速度对镀锌钢板摩擦系数的影响,确定了实验条件下CR4镀锌板的摩擦模型参数,并验证了其准确性。研究表明:摩擦系数随着油膜厚度增加而减小并最终趋于稳定;随着滑动速度增加,摩擦系数减小。油膜厚度和滑动速度的增加都使得模具和板料镀层直接接触的面积在实际接触面积中的百分比降低,从而摩擦力下降。
Sheet metal forming process, the friction characteristics directly affect the quality of the forming parts. By analyzing the stress of metal plating on boundary lubrication and fluid lubrication, a friction model of lubricating oil film thickness and sliding velocity under mixed lubrication condition was established. The effect of lubricant film thickness and sliding speed on the coefficient of friction of galvanized steel was studied by using flat sliding friction test. The friction model parameters of CR4 galvanized steel under experimental conditions were determined and its accuracy was verified. The results show that the friction coefficient decreases with the increase of oil film thickness and finally tends to be stable. As the sliding speed increases, the friction coefficient decreases. Oil film thickness and sliding speed are increased so that the mold and sheet metal coating the direct contact area percentage reduction in the actual contact area, thus reducing the friction.