镁合金管滚珠旋压变形区温升特性研究  

Finite Element Simulation of Heat Generation of Magnesium Alloy Tube by Ball Spinning

作　　者：赵春江[1] 张飞涛 刘雁伟 苏梦颖 Zhao Chunjiang;Zhang Feitao;Liu Yanwei;Su Mengying(Collaborative Innovation Center of Taiyuan Heavy Machinery Equipment, Taiyuan University of Science and Technology, Taiyuan 030024,China)

机构地区：[1]太原科技大学太原重型装备协同创新中心

出　　处：《稀有金属材料与工程》2019年第7期2151-2158,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51375325);国家自然科学基金山西煤炭联合基金(U1610118,U1510131)

摘　　要：滚珠旋压由于连续逐点成型特性而产生大量的变形热而需要对变形区进行连续冷却。由于镁合金成型温度较低,可以利用摩擦与变形热替代镁合金薄壁管滚珠旋压工件的加热过程。通过有限元模拟对不同工艺参数下的生热规律进行计算。结果表明:滚珠旋压变形影响区的温度随着摩擦系数、模具转速、减薄量和进给比的提高而增加,其中,减薄量对温度的提高最为敏感,模环转速对温度的提高影响较小,摩擦系数对温升的影响最小;在高转速和大减薄量时变形影响区的温度可以达到220℃以上,可以满足镁合金温热成型的温度要求。变形区非接触式温度测量结果表明,模拟结果与实测结果吻合度较高。Ball spinning requires a continuous cooling of the deformation zone due to the large amount of deformation heat generated by the continuous point-by-point molding characteristics. According to the low forming temperature of magnesium alloy, friction and deformation heat can be used to replace the heating process of the thin-walled magnesium alloy tube in ball spinning process. The heat generation laws under different process parameters were calculated by finite element simulation. The results show that the t emperature in the spinning deformation zone increases with the increase of rotating speed, thinning amount, feed ratio and friction coeffic ient. For these four parameters, the friction coefficient has the least effect on the temperature rise, the amount of thinning has the most obvious effect on the increase of temperature, while the effect of mold speed on the rising of temperature is slight. Under high speed and a large amount of thinning, the temperature of the deformation zone can reach above 220 °C, wh ich can meet the temperature requirement of hot forming of magnesium alloy. The results of non-contact temperature measurement in the deformation zone show that the simulation results are in good agreement with the measured results.

关 键 词：AZ31B镁合金 薄壁管 滚珠旋压 变形区温升 有限元 

分 类 号：TG146.22[一般工业技术—材料科学与工程]