6061铝合金管材热挤压成形模拟分析  

Simulation analysis of hot extrusion forming process for 6061 aluminum alloy tube

作　　者：郭兴茂 

机构地区：[1]太原重工股份有限公司技术中心,山西太原030024

出　　处：《锻压装备与制造技术》2016年第3期93-95,共3页China Metalforming Equipment & Manufacturing Technology

基　　金：山西省科技创新资助项目(2013101012)

摘　　要：铝合金管材热挤压时,采用空心铸锭无润滑穿孔针工艺,管材内表面质量好,但穿孔力大,断针频繁。以外径460mm,壁厚15mm的铝合金管材为研究对象,利用Forge软件对其采用空心铸锭无润滑穿孔针的热挤压成形过程进行模拟。结果表明,挤压前期,铸锭由镦粗进入挤压状态,铸锭内孔与穿孔针经历了接触、分离和再接触的过程,铸锭外圆与挤压筒先是局部接触,而后向两端延伸,至全长接触前,铸锭整体沿长度方向呈鼓形。挤压力和穿孔力峰值同时出现在铸锭头部进入模具工作带时,穿孔力峰值约为挤压力峰值的1/4。The hollow ingot non-lubrication piecing needle technology has been adopted in the hot extrusion process for the aluminum alloy tube. The better inside quality of tube has been obtained but with frequent needle-broken fault caused by big piecing force. Taking the aluminum alloy tube with 460mm outside diameter and 15mm thickness as the research object, the Forge software has been adopted to stimulate the hollow ingot non-lubrication piecing needle hot extrusion process. The results show that at the initial phase of extrusion the ingot goes into extrusion state from upsetting. The inner hole of ingot and piecing needle go through contacting, separating and re-contacting process. Out circle of ingot firstly contacts with extrusion reel partly, then extends to both sides. The whole ingot is in drum shape along the length direction before full length contacting. The extrusion force and piecing force peak value appear at the same time when the ingot head goes into the tool working region. The piecing force peak is about 1/4 of the extrusion force peak value.

关 键 词：热挤压 铝合金 管材挤压 模拟分析 

分 类 号：TG315.4[金属学及工艺—金属压力加工]