摘要
介绍了用超塑挤压与超塑焊接复合成形法生产镁合金管材的技术原理,对镁合金管材挤压成形进行了实验研究,并通过实验确定了用这种方法生产挤压比为12.5的AZ91D镁合金管的生产工艺。主要工艺参数为:镁棒预热温度为350～400℃,模具预热温度为300～350℃,压头平均挤压速度为0.5mm/s。实验结果表明,在这种工艺条件下,挤出的管子表面质量好,无气泡、横裂纹等缺陷。用超塑挤压与超塑焊接复合成形管材可以实现连续挤压,在不改变毛坯尺寸的情况下得到所需长度的管材,而且模具及其内残余镁合金重复加热可保证模具多次使用,不用清洗。
The principle of using superplastic extrusion and superplastic welding composite forming to produce magnesium alloy tube was introduced. The extrusion forming of magnesium alloy tube was studied expermentally and the superplastic extrusion and superplastic welding composite forming process of AZ91D magnesium alloy tube with extrusion ratio 12.5 was determined. The main parameters are that the preheating temperature of AZ91D magnesium alloy bar is 350-400℃, the preheating temperature of extrusion die is 300-350 ℃ and the average velocity of pressure head is 0.5 mm/s. The results show that the pipes extruded under these conditions have good surface quality without blister and transverse crack. It can accomplish continuous extrusion by using the superplastic extrusion and superplastic welding composite forming process to produce the tube. And the desired length of the tube can be produced without changing the size of blank. The extrusion die can be used repeatedly by heating magnesium alloy remained in the extrusion die without cleaning.
出处
《铸造技术》
CAS
北大核心
2007年第12期1591-1594,共4页
Foundry Technology
基金
洛阳市科技发展计划项目
项目编号:0602018A-2
关键词
AZ91D镁合金
管材
超塑挤压与超塑焊接复合成形
AZ91D magnesium alloy
Tube
Superplastic extrusion and superplastic welding composite forming
