超硬铝合金无缝管材挤压成形工艺优化  

Optimization based on extrusion for seamless tube of super hardness aluminum alloy

作　　者：李峰[1] 林俊峰[2] 李超[1] 刘晓晶[1] 

机构地区：[1]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150040 [2]哈尔滨工业大学金属精密热加工国家级重点实验室,黑龙江哈尔滨150001

出　　处：《中南大学学报（自然科学版）》2011年第10期3020-3025,共6页Journal of Central South University:Science and Technology

基　　金：博士后科研启动基金资助项目(LBH-Q10065);哈尔滨市青年科技创新人才基金资助项目(2010RFQXG021)

摘　　要：为了揭示大型铝合金无缝管材挤压成形中的关键技术问题,以7075铝合金为例,采用刚黏塑性有限元法分析工艺参数对铝合金管材挤压成形过程的影响。研究结果表明:随着成形温度增加,挤出模口处所受附加拉应力逐渐降低,但过高挤压温度反而会增大黏附力;随着挤压速度增大,所需挤压载荷明显增加,且管材挤出过程中金属变形流动的均匀性随之降低;在挤压温度为430℃、挤压速度为2 mm/s时进行工艺实验,一次性成形大型铝合金无缝挤压管材,且所得制品的表面质量良好,符合使用要求。In order to reveal the crux of technology problem existing in the extrusion formation to seamless tube of aluminum alloy,the aluminum alloy 7075 was taken as example,and through numerical simulation of finite element method（FEM）,technology parameters which impact the extrusion formation of aluminum alloy seamless tube were analyzed.The results show that with the increase of the extrusion velocity,the extrusion loading increases sharply and the uniformity of metal forming flow decreases in tube extrusion process.According to the analysis,at the forming conditions of temperature 430 ℃ and extrusion speed 2 mm/s,the large seamless tube of aluminum alloy is formed and a fine surface quality is achieved,which meets the application criterion.

关 键 词：铝合金 无缝管 挤压 工艺优化 

分 类 号：TG376[金属学及工艺—金属压力加工]