塑性成形表面微凸体平坦化行为研究

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Asperity flattening plays an important role in the interfaeial friction and lubrication in metal forming. In order to surface quality of products and the control of tool-workpiece investigate the flattening behaviors of workpiece surface asperities, a finite element model for rough surface contact between tool and workpiece in drawing process was developed. The effects of the contact pressure, bulk plastic strain, interfacial friction and asperity angle on the asperity flattening were analyzed. The results show that interfacial sliding friction contributes to the asperity flattening, but its contribution to asperity flattening is not comparable to that of bulk plastic strain as well as contact pressure. The resistance of asperity to flattening is increased with increasing asperity angle, but the increasing rate is decreased gradually, especially for asperity angles greater than 10°.在金属塑性成形中，工件表面微凸体的平坦化对产品表面质量、工件一模具接触界面的摩擦和润滑有重要影响。为了研究拉延成形过程中工件表面微凸体的平坦化行为，建立模具与工件粗糙表面接触的有限元模型，分析了接触压力、基体塑性应变、界面摩擦和微凸体角度等因素对微凸体平坦化的影响。结果表明，界面滑动摩擦有利于微凸体平坦化，但其促进效应无法与基体塑性应变和接触压力相比；微凸体平坦化阻力随着其角度的增加而增加，但增加趋势逐渐减缓，特别是微凸体角度大于10°时。