工程科学学报，第39卷.第8期：1198-1206,2017年8月 Chinese Journal of Engineering,Vol.39,No.8:1198-1206,August 2017 D0L:10.13374/j.issn2095-9389.2017.08.009;htp:/journals..usth.edu.cn 基于Lemaitre模型的辊式冲裁工艺断面质量分析 刘倩)区，韩静涛)，田亚强)，郑小平)，宋进英)，陈连生) 1)华北理工大学冶金与能源学院现代治金技术教育部重点实验室，唐山0632102)北京科技大学材料科学与工程学院，北京100083 区通信作者，E-mail:iwooden@163.com 摘要为了准确表征材料变形中逐渐劣化的过程，引入考虑损伤与裂纹萌发的弹塑性本构模型.基于Abaqus/Explic©it的二 次开发接口，编写耦合Lemaitre损伤模型的用户子程序，根据算例验证其可靠性.通过反复加载-卸载拉伸试验并利用弹性 模量变化法来获得损伤参数值.建立辊式冲裁工艺有限元模型.应用Lemaitre损伤模型来预测断面质量，并进行试验验证. 分析冲裁间隙、模具磨损与板厚等工艺参数对断面质量、冲裁力及扭矩的影响.结果表明：前刃口断面质量总体上要好于后 刃口，但光亮带具有一定的倾角：塌角区会随冲裁间隙增加而增大：模具磨损程度增加会导致毛刺急剧增大：最大冲裁力与扭 矩会随着板厚的增大而增大. 关键词冲裁工艺；断面质量；Lemaitre损伤模型；VUMAT;模具磨损 分类号TG386.2 Analysis of sheared edge quality in rotary blanking process based on Lemaitre damage model LIU Qian,HAN Jing-tao,TIAN Ya-qiang,ZHENG Xiao-ping,SONG Jin-ying,CHEN Lian-sheng 1)Key Laboratory of the Ministry of Education for Modern Metallurgy Technology,College of Metallurgy and Energy.North China University of Science and Technology,Tangshan 063210,China 2)School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:iwooden@163.com ABSTRACT To accurately describe the material degradation process from elastoplastic deformation to final rupture,an elastoplastic constitutive model was established to feature damage and crack initiation.A user-defined material subroutine VUMAT was developed, based on the Abaqus/Explicit platform,and its reliability was validated with an example.The damage parameter values were deter- mined in cyclic loading-unloading tensile tests,using the Young's modulus weakening method.To predict the sheared edge quality,a finite element model of rotary blanking coupling with a Lemaitre damage model was built and the numerical results were compared with experimental results.The influences of blanking clearance,die wear and sheet metal thickness on the sheared edge quality,blanking force and torque were investigated.The results show that the sheared edge quality of the leading cutting edge is generally better than that of the trailing cutting edge,but the burnish depth of the leading cutting edge tilts at an angle.The rollover is larger,as is the die clearance.There is an extreme increase in the burr height when the degree of die wear is higher.The highest blanking force and torque values increase as the sheet metal thickness increases. KEY WORDS blanking process;sheared edge quality;lemaitre damage model;VUMAT;die wear 冲裁是利用模具使材料发生断裂分离的冲压工量好坏的最重要指标.近年来，发展了一种新型冲裁 序，广泛应用于汽车、航空航天、电子与船舶等行 工艺一辊式冲裁[)，将多组模具对应安装在一对轧 业-].从工业应用角度来说，断面质量是评价工件质 辊上，通过轧辊同步且相向旋转来实现连续冲裁，其显 收稿日期：2016-09-20工程科学学报,第 39 卷,第 8 期:1198鄄鄄1206,2017 年 8 月 Chinese Journal of Engineering, Vol. 39, No. 8: 1198鄄鄄1206, August 2017 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2017. 08. 009; http: / / journals. ustb. edu. cn 基于 Lemaitre 模型的辊式冲裁工艺断面质量分析 刘 倩1) 苣 , 韩静涛2) , 田亚强1) , 郑小平1) , 宋进英1) , 陈连生1) 1) 华北理工大学冶金与能源学院现代冶金技术教育部重点实验室, 唐山 063210 2) 北京科技大学材料科学与工程学院, 北京 100083 苣 通信作者, E鄄mail: iwooden@ 163. com 摘 要 为了准确表征材料变形中逐渐劣化的过程,引入考虑损伤与裂纹萌发的弹塑性本构模型. 基于 Abaqus/ Explicit 的二 次开发接口,编写耦合 Lemaitre 损伤模型的用户子程序,根据算例验证其可靠性. 通过反复加载鄄鄄卸载拉伸试验并利用弹性 模量变化法来获得损伤参数值. 建立辊式冲裁工艺有限元模型,应用 Lemaitre 损伤模型来预测断面质量,并进行试验验证. 分析冲裁间隙、模具磨损与板厚等工艺参数对断面质量、冲裁力及扭矩的影响. 结果表明:前刃口断面质量总体上要好于后 刃口,但光亮带具有一定的倾角;塌角区会随冲裁间隙增加而增大;模具磨损程度增加会导致毛刺急剧增大;最大冲裁力与扭 矩会随着板厚的增大而增大. 关键词 冲裁工艺; 断面质量; Lemaitre 损伤模型; VUMAT; 模具磨损 分类号 TG386郾 2 Analysis of sheared edge quality in rotary blanking process based on Lemaitre damage model LIU Qian 1) 苣 , HAN Jing鄄tao 2) , TIAN Ya鄄qiang 1) , ZHENG Xiao鄄ping 1) , SONG Jin鄄ying 1) , CHEN Lian鄄sheng 1) 1) Key Laboratory of the Ministry of Education for Modern Metallurgy Technology, College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China 2) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China 苣 Corresponding author, E鄄mail: iwooden@ 163. com ABSTRACT To accurately describe the material degradation process from elastoplastic deformation to final rupture, an elastoplastic constitutive model was established to feature damage and crack initiation. A user鄄defined material subroutine VUMAT was developed, based on the Abaqus/ Explicit platform, and its reliability was validated with an example. The damage parameter values were deter鄄 mined in cyclic loading鄄unloading tensile tests, using the Young爷s modulus weakening method. To predict the sheared edge quality, a finite element model of rotary blanking coupling with a Lemaitre damage model was built and the numerical results were compared with experimental results. The influences of blanking clearance, die wear and sheet metal thickness on the sheared edge quality, blanking force and torque were investigated. The results show that the sheared edge quality of the leading cutting edge is generally better than that of the trailing cutting edge, but the burnish depth of the leading cutting edge tilts at an angle. The rollover is larger, as is the die clearance. There is an extreme increase in the burr height when the degree of die wear is higher. The highest blanking force and torque values increase as the sheet metal thickness increases. KEY WORDS blanking process; sheared edge quality; lemaitre damage model; VUMAT; die wear 收稿日期: 2016鄄鄄09鄄鄄20 冲裁是利用模具使材料发生断裂分离的冲压工 序,广 泛 应 用 于 汽 车、 航 空 航 天、 电 子 与 船 舶 等 行 业[1鄄鄄2] . 从工业应用角度来说,断面质量是评价工件质 量好坏的最重要指标. 近年来,发展了一种新型冲裁 工艺———辊式冲裁[3] ,将多组模具对应安装在一对轧 辊上,通过轧辊同步且相向旋转来实现连续冲裁,其显