[1]李静媛,项胜前,周春荣,等.铝合金型材等温快速挤压实时自动控制技术[J].中国材料进展,2013,(5):061-70.[doi:10.7502/j.issn.1674-3962.2013.05.07]
　Li Jingyuan Xiang Shengqian Zhou Chunrong Song Yong Hu Shuiping Gu Wei Xie Jianxin.Real-time automatic control technology of rapid isothermal extrusion of aluminum alloy profile[J].MATERIALS CHINA,2013,(5):061-70.[doi:10.7502/j.issn.1674-3962.2013.05.07]
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铝合金型材等温快速挤压实时自动控制技术()
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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
期数:
2013年第5期
页码:
061-70
栏目:
出版日期:
2013-05-31

文章信息/Info

Title:
Real-time automatic control technology of rapid isothermal extrusion of aluminum alloy profile
作者:
李静媛; 项胜前; 周春荣; 宋勇; 胡水平; 顾伟; 谢建新
(1.北京科技大学,北京 海淀 100083;2.广东豪美铝业股份有限公司;广州 清远 511540)
Author(s):
Li Jingyuan1 Xiang Shengqian2 Zhou Chunrong2 Song Yong1 Hu Shuiping1 Gu Wei1 Xie Jianxin1
(1. University of Science and Technology Beijing, Beijing 100083, China) (2. Haomei Aluminium Co. Ltd. Guangdong 511540, China)
关键词:
等温挤压; 梯度水冷; 在线冷却; 预测模糊控制
DOI:
10.7502/j.issn.1674-3962.2013.05.07
摘要:
介绍了国内外等温挤压技术的发展现状，阐述了等温挤压的技术原理，开发了一种新的等温快速挤压三重实时自动控制系统，包括坯料梯度水冷系统、模具液氮在线冷却系统和挤压速度-出口温度闭环控制系统。研究发现，采用有限差分离散求解坯料导热微分方程，设定轴向温度梯度，控制在线梯度水冷装置施加冷却，可抵消挤压过程中部分温升；通过出口温度数据回归获得温升模型，控制液氮通入量，可维持模具工作带温度恒定，延长模具寿命，并提高型材表面质量；根据采集的模孔出口型材温度，依据预测模糊控制模型，进行闭环控制以调节挤压速度，可提高型材温度控制精度。通过三重控制系统联动，最终实现模孔出口处型材温度恒定。此系统的应用有利于提高型材挤压速度，可保证型材沿长度方向上尺寸精度与组织性能稳定。对于挤压速度较快的情形，可控制模孔出口处型材温度波动在±10℃以内，对于挤压速度较慢的工业型材，可控制模孔出口处型材温度精度在±5℃之内；对于挤压性能好的合金，挤压速度最高可提升30%以上。
Abstract:
This paper introduces the research and progress of isothermal extrusion in the world, clarifies the control principle and method of this technology, and develops a new real-time automatic control system of rapid isothermal extrusion composed by the gradient water-cooling system of billets, the liquid nitrogen cooling system of mould and the closed loop control system of extrusion speed and outlet temperature. Studies have found that it can inhibit the temperature elevating of billet during extrusion through the gradient water-cooling device with the pre-produced axial temperature gradient of billet, which is controlled by the finite difference method and discretized heat conduction equation. Exit temperature regression model are adopted to control liquid nitrogen intake to cool the extrusion mold, which stabilizes the mold operating temperature, prolongs the mould life and improves the quality of profile surface. The temperature of the profile can be adjusted accurately by the predictive fuzzy model though adjusting extrusion speed using closed loop method. Consequently, the temperature of the profile at the extrusion exit would maintain constant due to the triple linkage control system. This system is also beneficial to improve the speed of extrusion, and ensure the accuracy of dimension and stability of microstructures and properties along the length direction of the profiles. For rapid extrusion, the fluctuations of profiles temperature at the exit can be limited within ± 10℃, and for slow extrusion speed producing industrial profiles, the temperature accuracy of the exit profile can be contained within ±5℃, also the extrusion speed can increase by more than 30% for the extrusion alloy with good performance

参考文献/References:

[1].第24卷 第10期 稀有金属快报 Vol.34, No.10

更新日期/Last Update: 2013-05-10