辊缝偏载对镁合金板材边裂的影响规律研究  

Study on effect of roll gap eccentricity on edge cracks of magnesium alloy sheets

作　　者：齐艳阳 刘江林 王涛 任忠凯[1,2,3] 韩建超 毕朝瑞 QI Yan-yang;LIU Jiang-lin;WANG Tao;REN Zhong-kai;HAN Jian-chao;BI Chao-rui(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China;TYUT-UOW Joint Research Center,Taiyuan University of Technology,Taiyuan 030024,China;Space Star Technology Co.,Ltd.,Beijing 100086,China)

机构地区：[1]太原理工大学机械与运载工程学院,山西太原030024 [2]太原理工大学先进金属复合材料成形技术与装备教育部工程研究中心,山西太原030024 [3]太原理工大学中澳联合研究中心,山西太原030024 [4]航天恒星科技有限公司,北京100086

出　　处：《塑性工程学报》2020年第6期87-92,共6页Journal of Plasticity Engineering

基　　金：国家自然科学基金重点项目(U1710254);山西省自然科学基金资助项目(201701D221143);山西省科技重大专项项目(20181102011);山西省高等学校科技创新基金资助项目(2017132);太原市科技重大专项项目(170203)。

摘　　要：针对实际轧制过程中辊缝存在的偏载现象,设计实验研究了辊缝偏载对镁合金板材边裂的影响。在轧制温度为400℃、轧制速度为480 mm·s-1的工艺条件下,对规格为100 mm×60 mm×3 mm的AZ31B镁合金板材先后进行了第1道次压下率为33%和第2道次压下率为50%的辊缝偏载轧制实验。结果表明,经过两道次轧制后,AZ31B镁合金板材左侧每100 mm的边裂数目、边裂平均深度和边裂最大深度均大于右侧。使用DEFORM-3D对辊缝偏载进行了有限元模拟,综合分析得出,镁合金板材左侧的压下率较大,受到的拉应力及应力集中程度较大,应变速率较快,温度较低,导致镁合金板材在轧制过程中左侧的边裂程度较右侧严重;当临界损伤值取0.45时,边裂仿真结果与实验结果吻合度较高。Aiming at the phenomenon of roll gap eccentricity in actual rolling process,the experiments were designed to study the effect of roll gap eccentricity on edge cracks of magnesium alloy sheets.Under the process conditions of rolling temperature of 400℃and rolling speed of 480 mm·s-1,the roll gap eccentricity rolling experiments of AZ31B magnesium alloy sheets with the specifications of 100 mm×60 mm×3 mm were carried out with the first reduction of 33%and the second reduction of 50%.The results show that the number of edge cracks per 100 mm,the average depth of edge cracks and the maximum depth of edge cracks on the left side of AZ31B magnesium alloy sheets after two passes rolling are larger than those on the right side.DEFORM-3D was used to simulate the roll gap eccentricity.The comprehensive analysis shows that the left side of magnesium alloy sheets has a higher reduction,with a greater degree of tension stress and stress concentration,a faster strain rate and a lower temperature,which results in the edge cracks degree on the left side of magnesium alloy sheets during rolling process is more serious than that on the right side.When the critical damage value is 0.45,the simulation results of edge cracks agree well with the experimental results.

关 键 词：镁合金 板材轧制 辊缝偏载 边裂 

分 类 号：TG335.1[金属学及工艺—金属压力加工]