Transactions of Materials and Heat Treatment

Title：Cause analysis and control on flatness out of tolerance for electronic shield bracket

Authors： Zhang Jinliang Cao Jianguo Shao Changwei Du Lei Wu Huan Dai Xiandong

Unit： School of Mechanical Engineering Sichuan University Changjiang Machinery Co. Ltd.

KeyWords： shield bracket flatness springback warpage fine blanking

ClassificationCode：TG355.83

year,vol(issue):pagenumber：2022,47(11):109-115

Abstract：

The shield bracket is an important part of shield. In order to solve the problem of product flatness out of tolerance for shield bracket, the causes and process optimization were analyzed. Firstly, the influences of ejection force, blank holder, blank holder force and sheet process structure on the forming quality of shield bracket were discussed by numerical simulation. The results show that increasing the ejection force, adding the blank holder and full deep drawing, increasing the blank holder force and improving the process structure were beneficial to restrain the warpage tendency of sheet stamping part. Then, according to the influence factors, an optimized scheme was designed, and the actual experiment was finally passed. In the addition, it is found that adding an overpressure shaping process with an overpressure amount of 0.01 mm after the fine blanking and changing the sheet metal process structure before the drawing process to a C-type are beneficial to restrain the warpage. At the same time, the two optimization schemes are adopted at the same time can reduce the flatness from 0.6-0.8 mm to 0.3-0.5 mm.

Funds：

四川大学-泸州市人民政府战略合作科技创新研发项目（2021CDLZ-3）

作者简介：张金梁（1997-），男，硕士研究生，E-mail：1109186228@qq.com；通信作者：曹建国（1971-），男，博士，副教授，E-mail：cjgkl@sina.com

Reference：

[1]窦智. 光头屏蔽罩级进模设计[J]. 模具制造,2004，(12):15-17.

Dou Z, Design of progressive die for the shield cover[J]. Die & Mould Manufacture, 2004，(12):15-17.

[2]郭敏杰,曾珊琪. 基于Dynaform的汽车纵梁工艺分析及冲压数值模拟[J]. 热加工工艺,2011,40(5):112-114.

Guo M J, Zeng S Q. Process analysis and stamping numerical simulation of auto carling based on Dynaform[J]. Hot Working Technology, 2011,40(5):112-114.

[3]刘斐然,纵荣荣,李乐乐,等. 汽车后风挡横梁冲压工艺仿真分析与优化设计[J]. 河北工业大学学报,2020,49(3):55-62.

Liu F R, Zong R R, Li L L, et al. Stamping process simulation analysis and optimization design for a car-rear-windshield-cross beam[J]. Journal of Hebei University of Technology, 2020,49(3):55-62.

[4]李世云,周杰,蒋峥嵘,等. 基于Dynaform汽车前纵梁延伸件的数值模拟及优化[J]. 热加工工艺,2011，40(19)：104-106.

Li S Y, Zhou J, Jiang Z R, et al. Numerical simulation and optimization of front rails extension part based on Dynaform[J]. Hot Working Technology, 2011,40(19):104-106.

[5]李培有. 对薄板冲压件的成形工艺及实现方法探讨[J]. 赤子,2012，(10):178,112.

Li P Y. Discussion on forming technology and realization method of sheet stamping parts [J]. Naked, 2012，(10):178,112.

[6]李光耀,谭长平. 基于遗传算法的变压边力模型及其在回弹控制中的应用[J]. 湖南大学学报：自然科学版,2005,32(2):1-5.

Li G Y, Tan C P. A variable blankholder force model based on genetic algorithm and its application in springback analysis[J]. Journal of Hunan University：Natural Sciences, 2005,32(2):1-5.

[7]马家鑫,李细锋,陈劼实,等. 金属薄板非均匀局部变形诱发的翘曲回弹控制方法研究[J].材料科学与工艺，2010，18（S1）：14-17.

Ma J X, Li X F, Chen J S, et al. Research on the control of the warpage springback induced by non-uniform local deformation [J]. Materials Science & Technology，2010，18（S1）：14-17.

[8]张成浩.大型薄板金属冲压件局部特征成形平面度控制方法[J].模具工业,2021,47(6):23-28.

Zhang C H. Control method of local characteristic forming flatness of large sheet metal stamping parts[J]. Die & Mould Industry, 2021,47(6):23-28.

[9]沈玲. 冷轧薄板冲压件成型影响因素及实例分析[J]. 内燃机与配件,2018，(9):146-147.

Shen L. Influence factors and example analysis of cold rolled sheet stamping parts forming[J]. Internal Combustion Engines & Parts, 2018，(9): 146-147.

[10]毛丽臣. 大型薄板局部特征成形过程中的凸包开裂与翘曲回弹控制技术研究[D]. 长沙：湖南大学,2012.

Mao L C. Research on the Control Techniques of Convex Cracking and Warping Springback Caused by Local Features Forming during the Large Sheet Parts Stamping Process[D]. Changsha: Hunan University, 2012.

[11]刘佳杰. 基于DYNAFORM的板料弯曲回弹的数值模拟研究[D]. 长沙：中南林业科技大学,2012.

Liu J J. Research on the Numerical Simulation of Sheet-metal Bending Springback Based DYNAFORM[D]. Changsha: Central South University of Forestry & Technology, 2012.

[12]马子超,冯再新,苏晓波,等. 板料弯曲成形中回弹预测和控制的研究进展[J]. 锻压装备与制造技术,2015,50(5):59-63.

Ma Z C, Feng Z X, Su X B, et al. Research progress on prediction and control of springback in sheet metal bending process[J]. China Metalforming Equipment & Manufacturing Technology, 2016,50(5):59-63.

[13]赵艳龙,齐晓冬.高精度薄板冲压模具的设计与加工[J]. 模具制造,2014,14(8):16-18.

Zhao Y L, Qi X D. The design and manufacture of stamping die for high precision thin plate [J] . Die & Mould Manufacture, 2014,14(8): 16-18.

Service：

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