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第43卷第1期 Vol. 43No.1
模具
假压技木
FORGING & STAMPING TECHNOLOGY
反复锻压模具结构和加工工艺的有限元分析
郭炜，谌哟，陆德平，刘克明2，付远
2018年1月 Jan.2018
（1.江西省科学院应用物理研究所，江西南昌330096；2.南吕工程学院江西省精密驱动与控制重点实验室，江西南吕330099）摘要：采用Deform-3D数值模拟软件对反复锻压模具结构和加工工艺进行有限元分析，发现：缩小模具型腔宽度能够增大试
次锻压，等效应变分布比每道次锻压后试样不旋转更均勾；加工速度对锻压后试样的温升影响十分明显，速度越高温升越显著；随着锻压温度的提高，载荷峰值不断降低，试样中应变和应力分布逐渐均勾；随着障擦系数的提高，等效应变分布均勾性有所改善，障擦系数提高到0.2时分布最均勾，继续增大到0.3时分布均勾性开始显著降低。在300℃和0.1mm·s-条件下锻压AZ31镁合金的实验表明：5道次后晶粒显著细化，平均晶粒尺寸由约200μm细化到最小约1.3μm。
关键词：反复锻压；模具结构；大应变量塑性加工技术；Defom-3D；AZ31镁合金 DOI: 10. 13330/j. issn. 1000-3940. 2018. 01. 018
中图分类号：TG306
文献标识码：A
文章编号：1000-3940（2018）01-0102-08
Finite element analysis on mould structure and processing
technology for repetitive forging
Guo Wei ', Shen Yun', Lu Deping', Liu Keming’, Fu Yuan'
(1. Institute of Applied Physics, Jiangxi Academy of Sciences, Nanchang 330096 , China ;
2. Jiangxi Key Laboratory for Precision Actuation and Control, Nanchang Institute of Technology , Nanchang 330099, China)
Abstract: The die structure and processing technology of repetitive forging was analyzed by numerical simulation software Deform 3D. It is found that the equivalent strain of each forging pass is increased by meducing the width of mould cavity, however, the homogeneity of strain
distribution and the shape and size retentivity of sample decrease.
When a certain transitional angle radius existes in the mould, the sample
surface obtaines a beter forming quality , and the homogeneity of strain distribution is slightly improved with the increasing of transitional an-
gle radius. While the sample is forged by next pass after it is rotated 90° around the Z
tained. Furthermore, the influence of prox
ixis
more uniform effective strain distribution is ob-
assing speed on the temperature rise in the forged sample is very significant , and a higher speed
nsakes the temperature rise remarkably. With the incresing of forging temperature, the maximum load decreases, while the homogeneity of strain and stress distribution in the sample increases. With the increasing of friction coefficient, the distribution uniformity of effective strain is slightly improved, and the most homogeneous strain distribution is obtained when it increases to 0. 2, however, the distribution unifomity startes to de-crease obriously when it ontinues to increase to 0. 3. The experimental investigation of fonging magnssium alloy AZ31 at 300 °C with a speed of 0. 1 mm + s-' shons that the avenige gnain size is motably refined from about 200 μm to the mininum 1. 3 μm after five passes
Key words : repetitive forging; mould structure; plastic processing technology with large strain; Deform 3D; magnesium alloy AZ31
近年来，大应变量塑性加工技术在国际上受到收稿日期：20170906；修订日期：20171121
基金项目：国家自热科学基金资助项目（51404151，51561010， 51461018）；江西省自然科季基金重大项目（20144ACB20013）；江西省科学院重点科研项目（2017-YZD220）；科研开发专项基金博士项目(2015-YYB-11）；协同创新专项普惠创一类项目 (2015 XTPHI 11)
作煮筒介：郭炜（1981-），男，博士，副研究员万方：omc053@163.cm
科研人员的重视并不断快速发展，这种技术是指在高温、室温甚至更低的温度下对金属或非金属材料逐道次进行塑性变形，使材料中累积相当大的塑性应变，将显微组织细化到微米级别甚基至纳米级别1-2)。采用这类加工技术不但能够细化基体组织，而且能够使第二相破碎、断裂、细化并使之分布更加均勾，提高力学性能的效果比挤压、锻造、轧制等常规加工手段更显著[3-4]。影响材料大应变量塑性加工效果的因素也有很多，例如：模具的内部和