镁合金板材温热拉深成形工艺的研究  

Deep-drawing of Magnesium Alloy Sheets at Warm Temperatures

作　　者：张坤[1] 徐永超[1] 张士宏[1] 王忠堂[1] 

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016

出　　处：《轻合金加工技术》2004年第8期16-18,26,共4页Light Alloy Fabrication Technology

基　　金：国家高技术研究发展专项经费资助项目(2003AA331120)

摘　　要：通过镁合金板材温热拉深试验确定适合板材成形的温度范围,分析了压边力对坯料成形质量的影响,选择适合成形的工艺条件来有效避免工艺缺陷的产生。试验采用刚性压边装置对压边力进行调整,润滑剂采用了液态的PTFE,通过对成形工艺缺陷的分析,确定适合成形的最佳工艺参数,以提高拉深件的极限拉深比。结果表明:成形温度选择在105-170℃范围内,此时镁合金轧制板材具有良好的拉深性能,极限拉深比可达到2.44;坯料的加热时间不宜过长,否则会严重降低板材的塑性变形能力。The optimum forming temperature range was determined, and the effects of blank holder forces on the workpiece quality were analyzed through the warm deep drawing experiments of magnesium alloy sheets. Therefore, appropriate process parameters were selected to avoid forming defects effectively. In the paper, the rigid blank holder was applied to adjust blank holder forees. A special liquid lubricant PTFE was used on the tools. Efforts are made to optimize process parameters by analyzing the causes of defects in order to improve the limit drawing ratio of magnesium alloy workpieces. It is found that rolled magnesium alloy sheets are of good deep drawing ability at a forming temperature range of 105-170℃ with the higher limit drawing ratio up to 2.44. It is also necessary to control the heating time of blanks. The formability will be reduced severely by excessive heating time.

关 键 词：镁合金 温热拉深 成形温度 润滑剂 极限拉深比 

分 类 号：TG386[金属学及工艺—金属压力加工]