锻压技术

基于试验设计和响应曲面法的大型带筋薄壁铝型材挤压工艺优化

英文标题：Optimization on extrusion process for large reinforced thin-walled aluminum profile based on experimental design and response surface method

作者：刘惠刘腾飞陈宗强王海龙高康军周志宇田昌仁陈良

单位：北京航空材料研究院北京市先进铝合金材料及应用工程技术研究中心山东大学

关键词：铝型材穿孔针挤压大型带筋薄壁铝型材响应曲面法挤压速度

分类号：TG146.21；TG379

出版年,卷(期):页码：2022,47(5):144-152

摘要：

以某大型带筋薄壁铝型材为研究对象，基于BBD试验设计、响应曲面法以及有限元模拟仿真，建立了工作带出口处型材截面流速均方差、最大挤压力与设计变量的响应函数关系，开展了穿孔针挤压成形工艺优化。研究结果表明：挤压速度是影响大型带筋薄壁铝型材穿孔针挤压成形材料流速的均匀性和挤压力大小的最显著因素。挤压成形工艺优化后，最优坯料温度为509.2 ℃、最优模具温度为506.1 ℃、最优挤压筒温度为518.8 ℃、最优挤压速度为0.2 mm·s-1，所对应的铝型材流速范围为5.393~8.910 mm·s-1、温度范围为509.1~510.3 ℃、最大挤压力为119.4 MN，获得了理想的材料流速与温度分布均匀性，型材圆筒部分和筋部组织均匀，晶粒大小形貌相近，并显著降低了挤压力，满足了实际生产需求。

For a large reinforced thin-walled aluminum profile, based on BBD test design, response surface method and finite element simulation, the response function relationships between mean square deviation of flow velocity for the profile section at the outlet of working belt, maximum extrusion force and design variable were established, and the optimization of perforated needle extrusion forming process was carried out. The research results show that the extrusion speed is the most significant factor affecting the uniformity of material flow rate and the extrusion force for large reinforced thin-walled aluminum profile during perforated needle extrusion forming. After extrusion process optimization，the optimal combination of process parameters is the billet temperature of 509.2 ℃, the die temperature of 506.1 ℃, the extrusion container temperature of 518.8 ℃ and the extrusion speed of 0.2 mm·s-1, and the corresponding material flow rate range is 5.393-8.910 mm·s-1, the temperature range is 509.1-510.3 ℃, the maximum extrusion force is 119.4 MN. Thus, the ideal material flow rate and temperature distribution uniformity are obtained, the structures of cylinder and rib for the profile are uniform, the grain size and appearance are similar, and the extrusion force is significantly reduced, which meets the actual production demand.

基金项目：

作者简介：刘惠（1987-），男，硕士，高级工程师，E-mail：liuhuisdu@126.com

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