Transactions of Materials and Heat Treatment

Title：Research on influence of die clearance on the quality of non-oriented electrical steel parts

Authors： Cao Hongzhi Hao Linpo Wu Wei Zhang Xianglin Luo Zhonghan Li Rongfeng

Unit： Huazhong University of Science and Wuhan Iron and Steel Group Corp Research and Development Center Wuhan Iron and Steel Group Corp

KeyWords： blanking die non-oriented electrical steel die clearance burr springback ovality

ClassificationCode：TG386

year,vol(issue):pagenumber：2016,41(3):94-98

Abstract：

To study the influence of die clearance on the quality of non-oriented electrical steel parts, a high precision floating blanking die was designed for non-oriented electrical steel 50WW470 and 50WW800, which were commonly used in motor cores. The influences of die clearance on burr depth, springback and ovality were analyzed by systematic blanking experiments. The results show that the burr depth increases with the increase of die clearance, while in certain scope the springback decreases. Furthermore, the material mechanical properties and uneven distribution of residual stress result in ovality, the mechanical properties of material in perpendicular to the rolling direction are better than that in parallel to the rolling direction, and the residual compressive stress in parallel to the rolling direction is bigger than that in perpendicular to the rolling direction. Therefore, the springback of part parallelling to the rolling direction is greater, so the size of part becomes bigger. After annealing, the residual compressive stress decreases, and anisotropy of electrical steel reduces, so the ovality decreases by 10%-60%.

Funds：

武汉钢铁（集团）公司合作的项目（WG/01T1/ QR070303）

曹洪志（1990-），男，硕士研究生通讯作者：张祥林（1963-），男，博士，教授

Reference：

［1］史双喜. 电机转子冲片冲压工艺分析与级进模设计[J]. 锻压技术,2015,40(1):94-98.Shi S X. Design and process analysis of progressive die for blanking piece of motor rotor[J]. Forging & Stamping Technology, 2015, 40(1):94-98.
［2］荀斌,丁浩,朱世根. 冲裁模具结构及间隙对针坯质量的影响研究[J]. 锻压技术,2015,40(5)：119-123.Xun B, Ding H, Zhu S G. Influence of structure and clearance for blanking die on needle quality[J]. Forging & Stamping Technology, 2015, 40(5): 119-123.

［3］Cheung C F, Lee W B, Chiu W M .An investigation of tool wear in the dam-bar cutting of integrated circuit packages[J]. Wear, 2000, 237(2): 274-282.
［4］Hernández J J, Franco P, Estrems M, et al. Modelling and experimental analysis of the effects of tool wear on form errors in stainless steel blanking[J]. Journal of Materials Processing Technology, 2006, 180,(1-3): 143-150.
［5］Fang G, Zeng P, Lou L. Finite element simulation of the effect of clearance on the forming quality in the blanking process[J]. Journal of Materials Processing Technology, 2002, 122(2-3): 249-254.
［6］Zafer Tekiner, Muammer Nalbant, Hakan Gürün. An experimental study for the effect of different clearances on burr, smooth-sheared and blanking force on aluminium sheet metal[J]. Materials and Design, 2006, 27(10):1134-1138.
［7］Faura F, García A, Estrems M. Finite element analysis of optimum clearance in the blanking process[J]. Journal of Materials Processing Technology, 1998, 80-81(1): 121-125.
［8］Luo S Y. Effect of the geometry and the surface treatment of punching tools on the tool life and wear conditions in the piercing of thick steel plate[J]. Journal of Materials Processing Technology, 1999, 88(1-3):122-33.
［9］Pyttel T, John R, Hoogen M. A finite element based model for the description of aluminium sheet blanking[J]. Int. J. Mach. Tools Manuf., 2000, 40(14):1993-2002.
［10］张凌云,蔺锋,李振军. 一种确定冲裁间隙试验模具的设计[J].锻压技术,2012,37(6):80-83.Zhang L Y, Lin F, Li Z J. Design of experimental die for determining blanking clearance[J]. Forging & Stamping Technology, 2012, 37(6):80-83.
［11］陈炎嗣. 冲压模具设计手册[M]. 北京: 化学工业出版社, 2013.Chen Y S. Stamping Die Design Handbook[M]. Beijing: Chemistry Industry Press, 2013.
［12］郭丽霞. 冲压毛刺的形成及其控制[J].金属加工,2010,(9):71-73.Guo L X. The formation and control of stamping burr[J]. Metal Forming, 2010, (9): 71-73.
［13］Jacek Mucha. An experimental analysis of effects of various material tool's wear on burr during generator sheets blanking[J]. The International Journal of Advanced Manufacturing Technology, 2010,(50): 495-507.
［14］肖恩. 硅钢片冲裁的回弹及模具刃口尺寸的确定[J].模具工业，1987,81(11):11-14.Xiao E. The springback and die dimension of silicon steel blanking[J]. Die & Mould Industry, 1987, 81(11): 11-14.
［15］贾俐俐.冲压工艺与模具设计[M].北京：人民邮电出版社，2008.Jia L L. Stamping Technology and Die Design[M]. Beijing: The Peoples Posts and Telecommunications Press,2008.
［16］韩志磊,胡树兵,熊雪松,等. 冲剪加工对无取向硅钢边缘组织和磁性能的影响[J].材料热处理学报,2014,35(Z):154-159.Han Z L, Hu S B, Xiong X S, et al. Influence of punching process on microstructure near cutting edge and magnetic properties of non-oriented electrical steel[J]. Transactions of Materials and Heat Treatment, 2014, 35(Z): 154-159.

Service：

【This site has not yet opened Download Service】【Add Favorite】