Transactions of Materials and Heat Treatment

Title：Research on hot forging parameters of a VCR engine rack

Authors： Nie Pei Wang Min Chen Xuehui Xie Shouqing Tang Qi

Unit： Hubei University of Automobile Technology Huazhong University of Science and Technology Dongfeng Forging Co. Ltd. Hanjiang Normal University

KeyWords： VCR engine rack hot forging process parameters numerical simulation

ClassificationCode：TH133.3；TP395.02

year,vol(issue):pagenumber：2019,44(1):10-16

Abstract：

Researching on influence and optimization of parameters in hot forging of a VCR (Variable Compression Ratio) engine rack can provide a theoretical basis for forging quality control. Therefore, a finite element model of the process was established based on DEFORM3D, and the influences of the initial forging temperature of blank and the loading speed of upper die on the metal filling, forming load and temperature and equivalent plastic stress distributions of finish forging were studied. The results show that the metal filling in the finish forging die cavity is full without folding defects in the range of parameters studied. As the initial forging temperature of blank or the loading speed of upper die increases, the loadings required for each forming step and the maximum equivalent plastic stress of finish forging both decrease, and the temperature of finish forging rises. Furthermore, the optimized parameters are obtained, and when the initial forging temperature of blank is 1050 ℃ and the loading speed is 50 mm·s-1, the temperature distribution of finish forging is reasonable, the metal filling is full without folding and excessive oxidation, and the stress and forming load are small. Finally, the optimized parameters were verified by the experiments.

Funds：

湖北省技术创新专项重大项目（2016AAA080）；湖北省自然科学基金资助项目（2017CFB587）；湖北省高等学校优秀中青年科技创新团队计划项目（T201518）；汽车动力传动与电子控制湖北省重点实验室(湖北汽车工业学院)开放基金资助项目（ZDK1201601）；校大学生创新创业训练计划项目（SJ201740）

聂婄（1995-），女，学士，E-mail：1274385083@qq.com；通讯作者：王敏（1979-），女，博士，教授，E-mail：sprit418@cqu.edu.cn

Reference：

[1]Nagaraju B, Sampath Kumar J, Srinivasarao M S, et al. Quasidynamic stress analysis on crank shaft of computerized variable compression ratio (VCR) diesel engine[J] .International Journal of Engineering Trends and Technology, 2015, 30(4): 121-125.

[2]沈颖刚, 郭玉彬, 李伟东. EGR对可变压缩比SI发动机燃烧及排放特性的影响[J].内燃机学报, 2014, 32(5): 426-431.

Shen Y G, Guo Y B, Li W D. Influence of EGR on combustion and emissions characteristics of a SI engine with variable compression ratios[J]. Transactions of CSICE, 2014, 32(5):426-431.

[3]ISO 1328-1：2013, Cylindrical gearsISO system of flank tolerance classification—Part 1：Definitions and allowable values of deviations relevant to flanks of gear teeth[S].

[4]Chen F, Ren F, Chen J, et al. Microstructural modeling and numerical simulation of multiphysical fields for martensitic stainless steel during hot forging process of turbine blade[J]. International Journal of Advanced Manufacturing Technology, 2016, 82(1-4):85-98.

[5]Cheng W J, Chi C Z, Wang Y Z, et al. 3D FEM simulation of flow velocity field for 5052 aluminum alloy multirow sprocket in cold semiprecision forging process[J]. Transactions of Nonferrous Metals Society of China, 2015, 25(3): 926-935.

[6]王松伟,张士宏,陈岩,等.某铝合金复杂锻件成形工艺设计及DEFORM3D模拟优化[J].锻压技术,2018,43(5):154-161.

Wang S W, Zhang S H, Chen Y, et al. Forming process design and DEFORM3D simulation optimization for a complex aluminum alloy forging [J]. Forging & Stamping Technology, 2018, 43(5):154-161.

[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]薛丹丹,董万鹏,王傲寒. 末端法兰热锻成形的数值模拟及工艺优化[J].锻压技术,2018,43(2):9-13.

Xue D D, Dong W P, Wang A H. Numerical simulation and process optimization on hot forging for terminal flange[J]. Forging & Stamping Technology, 2018, 43(2):9-13.

[9]Zhuang W H, Hua L, Han X H, et al. Design and hot forging manufacturing of noncircular spur bevel gear[J]. International Journal of Mechanical Sciences, 2017, 133: 129-146.

[10]Wu P, Wang B, Lin J, et al. Investigation on metal flow and forming load of bimetal gear hot forging process[J]. International Journal of Advanced Manufacturing Technology, 2016, 88(9-12):1-13.

[11]Miles M P, Fourment L, Chenot J L. Inertia effects in finiteelement simulation of metal forming processes[J]. Journal of Materials Processing Technology, 2017, 45(1-4):19-24.

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