AM80镁合金板材热挤压工艺的数值模拟

Simulation for AM80 Magnesium Alloy Sheet Hot Extrusion

通过理论计算建立AM80镁合金热挤压极限图,根据挤压极限图初步制定挤压工艺;在不同挤压工艺参数条件下,采用有限元模拟和试验相结合的方法,着重探讨了AM80镁合金挤压过程中挤压温度和挤压速度对挤压力、出模口温度变化情况的影响,得出了最佳工艺参数。结果表明:AM80镁合金的最佳挤压工艺参数为挤压温度350℃,挤压速度3mm·s-1;有限元模拟能真实反映不同工艺参数对镁合金挤压变形过程的影响,同时通过挤压试验型材的表面质量对所建立的挤压极限图进行验证,结果吻合较好。

AM80 magnesium alloy hot extrusion limit diagram was constructed by calculations, and the process parameters were chosen according to this limit diagram. Then using a combination of simulation and experimental methods, the effects of extrusion temperature and rate on the variation of extrusion pressure and exit temperature were studied in the process of AM80 magnesium alloy extrusion, and the optimal process parameters were obtained. The results show that the best extrusion process parameters were extrusion temperature of 350 ~C and extrusion rate of 3 mm~ s 1. It was found that finite element simulation could reflect the effects of different magnesium alloy extrusion parameters on the deformation. By verification of extrusion sheet surface quality, the experimental results agreed well with the constructed extrusion limit diagram.