Transactions of Materials and Heat Treatment

Title：Analysis and improvement on cold heading defect of special-shaped nuts for automobile based on finite element simulation

Authors： Yan Peize

Unit： School of Mechatronics and Automotive Engineering Puyang Vocational and Technical College

KeyWords： special-shaped nut multi-station cold heading material folding die structure Deform software

ClassificationCode：TG376

year,vol(issue):pagenumber：2022,47(12):21-26

Abstract：

For the local material folding problem of special-shaped nuts for automobile in the multi-station cold heading production, the forming of special-shaped nuts was simulated by software Deform. According to the inspection results of parts at each station, the folding defects first appeared at the thin-wall forming station, which was verified by finite element analysis. The results show that the folding defects are caused by material convection due to improper die structure design. Firstly, according to the material flow law of the original scheme, an improvement scheme of die structure was proposed to solve the problem of material folding. At the same time, in order to ensure the reliability of the entire forming process, the die structures of the subsequent stations was improved, and the simulation verification has been carried out. Finally, the improved die was manufactured based on the simulation results, and the trial die produce was processed by the multi-station cold heading machine. The results show that there are no folding defects in the thin-wall forming station and the subsequent stations, which is consistent with the simulation results, indicating that the finite element technology can accurately predict the process defects and effectively solve the actual problems of enterprises.

Funds：

濮阳职业技术学院校级科研课题（2021PZYKYA12）

闫培泽（1974-），男，硕士，副教授 E-mail：yanpz74@163.com

Reference：

[1]紧固件专业工人技术理论培训教材编审组. 冷镦工工艺学[M]. 北京：机械工业出版社, 1993.

Editing and Reviewing Group of Technical Theory Training Materials for Fastener Professional Workers. Cold Heading Technology[M].Beijing:China Machine Press, 1993.

[2]林崟, 杨明鄂.汽车法兰带肩螺母多工位冷镦成形工艺试验[J].锻压技术,2021,46(8):123-130.

Lin Y,Yang M E. Experiment on multi-station cold heading process for automobile flange shoulder nut[J].Forging & Stamping Technology,2021,46(8):123-130.

[3]卜军伟, 蔡云.基于DEFORM的直齿圆柱齿轮精锻工艺[J].锻压技术,2021,46(11):43-48.

Bu J W,Cai Y.Precision forging process for spur gear based on DEFORM[J].Forging & Stamping Technology,2021,46(11):43-48.

[4]高冲, 刘淑梅,霍文军.基于响应面法的铝合金连杆锻造工艺优化[J].热加工工艺,2020,49(11):97-100.

Gao C,Liu S M,Huo W J.Optimization of forging process for aluminum alloy connecting rods based on response surface method[J].Hot Working Technology,2020,49(11):97-100.

[5]周正, 杨莎,王天琪.铝合金轮毂锻压成形工艺及组织仿真[J].机械设计,2021,38(S2):205-208.

Zhou Z, Yang S, Wang T Q. Numerical simulation and microstructure simulation of aluminum alloy wheel forging process[J].Journal of Machine Design,2021,38(S2):205-208.

[6]姜天亮, 龚红英,赵小云,等.基于DEFORM-3D的花键轴坯料结构尺寸优化设计[J].塑性工程学报,2020,27(6):111-115.

Jiang T L, Gong H Y, Zhao X Y, et al. Optimum design of spline shaft blank structure dimension based on DEFORM-3D[J].Journal of Plasticity Engineering,2020,27(6):111-115.

[7]赵德颖, 张连东,朱恩领,等.挤压工艺参数对枝杈类锻件折叠缺陷的影响[J].塑性工程学报,2018,25(2):99-105.

Zhao D Y,Zhang L D,Zhu E L,et al.Effects of extrusion processing parameters on folding defects in branch-type forging[J].Journal of Plasticity Engineering,2018,25(2):99-105.

[8]李天宇, 王强,张治民.基于凸模结构的内筋壳体旋转挤压成形折叠缺陷研究[J].中北大学学报:自然科学版,2017,38(2):237-242.

Li T Y,Wang Q,Zhang Z M.Research on folding defects of inner ribbed shell based on punch structure[J].Journal of North University of China: Natural Science Edition,2017,38(2):237-242.

[9]齐永杰, 吕航鹰,余新平,等.6061铝合金深孔连接锻件模锻成形模拟研究[J].塑性工程学报,2019,26(2):109-118.

Qi Y J, Lyu H Y, Yu X P, et al. Simulation study on die forging forming of 6061 aluminum alloy deep hole connection forgings[J].Journal of Plasticity Engineering,2019,26(2):109-118.

[10]马才伏, 周兵.汽车三叉式万向节精密成形工艺[J].锻压技术,2021,46(6):41-47.

Ma C F, Zhou B. Precision forming process on atuomobile trident universal joint[J].Forging & Stamping Technology,2021,46(6):41-47.

[11]李天翔, 张利虎.车用异形件浮动凹模冷镦工艺分析及模芯结构优化[J].锻压技术,2021,46(11):62-67,82.

Li T X,Zhang L H.Cold upsetting process analysis and die core structure optimization on floating die for special-shaped parts of vehicle[J].Forging & Stamping Technology,2021,46(11):62-67,82.

[12]胡建军. DEFORM-3D塑性成形CAE应用教程[M]. 北京：北京大学出版社, 2011.

Hu J J.DEFORM-3D Plastic Forming CAE Application Tutorial[M].Beijing: Peking University Press, 2011.

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