辊压成形板材表面微结构数值模拟研究

Numerical simulation of microstructure on surface of roll forming sheet

微结构辊压成形技术是耦合了传统的辊压技术与微挤压成形技术的一种新型成形技术,该技术将所需微结构复制到辊表面,然后将辊上的微结构再复印到板材表面。通过有限元对板材微结构辊压成形过程进行数值模拟,对成形阶段及温度在90,120和150℃等条件下对成形力的影响进行分析,结果表明:整个辊压阶段,板料发生剧烈塑性变形的范围只集中在板料表层,应变的最大值总是分布在凹槽的底面,板料中间至底部几乎没有应变;同时随着温度升高,稳定成形阶段的载荷值呈降低趋势。通过实验进行了验证,给出了实验结果的局部测量值。

Abstract： Roll forming microstructure process is coupling with traditional rolling technology and micro - extruding technology. This tech- nology mainly copys the microstructure onto the surface of roller, and then the microstructure on the roller is duplicated on the aluminum sheet. Numerical simulation was used to model the roll forming of microstructure process, and the effect of forming stage and temperature on the forming force at different temperatures of 90, 120 and 150℃ was analyzed. The results show that there is large plastic deformation concentrated on the subcutaneous sheet, the max value of strain distributes on the bottom of groove, and there is almost not strain on the medium and bottom of sheet. In the meantime, with the increasing of temperature, the load in the stable forming stage decreases. The cor- relation experimental part was done, and the measure was shown on the local of experimental parts.