热镀锌先进高强度钢板摩擦耦合塑性变形行为

采用自行研制的板带式耦合摩擦试验机,通过设置不同的下压量和载荷的组合获得摩擦过程中钢板的不同塑性变形量,以此来模拟实际冲压过程中在成形力作用下不同变形量板料与模具的相对滑动.通过比较3种不同变形量下的表面粗糙度、摩擦系数和动态演化过程来确定模具拉毛的萌生,研究了塑性变形量对拉毛磨损的影响规律.结果表明:在耦合变形的摩擦条件下,拉毛萌生一般会经历"锌层开裂"、"材料转移"、"积聚长大"3个阶段;而塑性变形量越大,拉毛萌生越早,板材损伤越严重;拉毛产生的表面损伤是黏着磨损和犁沟效应共同作用的结果.

Plastic Deformation Behavior of Hot Dipped Advanced Galvanized Steel#br# Under the Condition of Friction Coupling

Different plastic deformation under the condition of friction coupling on a self developed friction tester was obtained by setting the reduction of punch and load. The friction tester can simulate the relative sliding under the forming force in the process of practical stamping. The surface roughness, friction coefficient and dynamic evolution were studied and analyzed to determine galling initiation. The results show that the galling initiation would go through three stages of film cracking, transfer and agglomerate, and the galling initiated earlier as the plastic deformation was larger. The surface damage was resulted from the effect of adhesive wear and plowing.