铜镁合金线材连续挤压扩展变形行为研究
Study on Deforming Behavior of Copper-magnesium Alloy Wire in Extending Continuous-extrusion Process
卢利平, 运新兵, 杨俊英, 宋宝韫
点击：3520次 下载：0次
作者单位：大连交通大学 连续挤压教育部工程研究中心, 辽宁 大连 116028
中文关键字：铜镁合金； 连续挤压； 扩展腔； 数值模拟
英文关键字：copper-magnesium alloy; continuous-extrusion; extending-chamber; numerical simulation
中文摘要：利用刚塑性有限元软件Deform-3D对铜镁合金线材连续挤压变形过程进行数值模拟，分析变形区坯料的温度场与速度场，研究其扩展变形行为，分析了扩展腔内各部分变形坯料的宏观硬度和微观组织。结果表明，坯料在腔体入口处流动速度最快，变形温度最高，扩展腔的两侧大部分为变形死区，流动速度接近零，变形温度最低。从腔体入口到模具出口，坯料流动速度逐渐减小，变形温度逐渐降低。 从腔体中心向两侧，坯料流动速度逐渐减小，变形温度逐渐降低。与挡料块接触部分的坯料，硬度最高，晶粒细小。扩展腔两侧的坯料，硬度最小，晶粒粗大。
英文摘要：The continuous extrusion of copper-magnesium alloy wire was numerically simulated by rigid-plasticity FEM software Deform-3D. The temperature and flow velocity fields of billet in the extending-chamber was analyzed. The extending deforming behavior of the billet was also investigated. The hardness and microstructure of the billet in the extending-chamber was studied. The results indicate that the temperature and flowing velocity in the entrance area of the extending-chamber is highest. Whereas, the temperature is lowest, and the flow velocity is zero at both wing sides of the extending-chamber, because these areas are dead zones. From the entrance of extending-chamber to the exit of the die, the temperature and flow velocity of the billet decrease gradually. The same thing happens to the direction of the side. The hardness is highest, and the grain is fine in the billet which contacts with the abutment. But, the hardness is lowest, and the grain is coarse in the billet of the side part in the extending-chamber.