Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第10期    总第175期    2013年10月

[PDF全文下载]        

    

文章编号:1004-0609(2013)10-2769-10
铝合金空心型材分流模挤压成形全过程温度场的数值模拟
侯文荣1,张志豪1,谢建新1,陈蕴博2

(1. 北京科技大学 材料先进制备技术教育部重点实验室,北京 100083;
2. 机械科学研究总院 先进制造技术研究中心,北京 100083
)

摘 要: 采用焊合区网格重构技术,解决包括分流与焊合过程的空心型材分流模挤压成形全过程温度场模拟问题,以一种典型大断面铝合金空心型材分流模挤压成形为实例,分析挤压速度和坯料温度对模孔出口处型材最高温度及型材横断面温度分布的影响,提出合理的坯料温度和挤压速度范围。结果表明:挤压速度对模孔出口处型材横断面温度分布不均匀性的影响较大,而坯料温度的影响较小:当挤压速度由0.6 mm/s增大到3.0 mm/s,坯料温度为500 ℃时,模孔出口处型材横断面上最高与最低温度的差值(最大温差)由28 ℃增大到60 ℃;而当挤压速度一定,坯料温度在480~520 ℃变化时,型材横断面上最大温差的变化不超过3 ℃。6005A型材的合理挤压条件:坯料温度520 ℃时,挤压速度范围为0.63~0.93 mm/s;坯料温度500 ℃时,挤压速度范围为0.87~1.14 mm/s;坯料温度480 ℃时,挤压速度范围为1.10~1.34 mm/s。

 

关键字: 空心型材;分流模挤压成形;网格重构;温度场

Numerical simulation of temperature field during whole extrusion process of aluminum hollow profile with porthole die extrusion forming
HOU Wen-rong1, ZHANG Zhi-hao1, XIE Jian-xin1, CHEN Yun-bo2

1. Key Laboratory for Advanced Materials Processing, University of Science and Technology Beijing,
Beijing 100083, China;
2. Advanced Manufacture Technology Center, China Academy of Machinery Science and Technology,
Beijing 100083, China

Abstract:The precision simulation problem of the temperature field of hollow profile during the whole extrusion process, including the dividing and welding stages, was solved by mesh reconstruction technology of welding zone. Taking the porthole die extrusion of a typical aluminum hollow profile with large cross section as an example, the effects of billet temperature and extrusion speed on the maximum temperature of profile near the die exit and the temperature distribution on cross section were analyzed, and the reasonable billet temperature and extrusion speed were obtained. The results show that, the influence of the extrusion speed on the inhomogeneous temperature distribution of the cross section of the profile near the die exit is significant, while the influence of the billet temperature is not obvious. When the constant billet temperature is 500 ℃, the difference of the highest and lowest temperature (maximum temperature difference) on the profile cross-section increases from 28 ℃ to 60 ℃with the extrusion speed increasing from 0.6 mm/s to 3.0 mm/s. The changes of maximum temperature difference on the profile cross section are not more than 3 ℃ with the billet temperature varying from 480 ℃ to 520 ℃ at constant extrusion speed. The extrusion conditions are that when the billet temperatures are 520, 500 and 480 ℃, the reasonable extrusion speed ranges are 0.63~0.93 mm/s, 0.87~1.14 mm/s and 1.10~1.34 mm/s, respectively.

 

Key words: hollow profile; porthole die extrusion forming; meshes reconstruction; temperature field

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com