Transactions of Materials and Heat Treatment

Title：Process scheme design and numerical simulation analysis on hot die forging for 34CrNiMo6 steel three-turn crankshaft

Authors： Yuan Lei Ran Junjun

Unit： The Engineering & Technical College of Chengdu University of Technology

KeyWords： 34CrNiMo6 steel three-turn crankshaft hot die forging filling effect resistance wall

ClassificationCode：TG316

year,vol(issue):pagenumber：2022,47(8):7-14

Abstract：

For a three-turn crankshaft made of 34CrNiMo6 high strength construction steel, the hot die forging process scheme was developed by the combination of numerical simulation and process experiment. Firstly, the high temperature rheological behavior of as-forged 34CrNiMo6 high strength construction steel for the three-turn crankshaft was studied, and the high temperature rheological model of 34CrNiMo6 steel was established by software DEFORM. Secondly, the initial process scheme was simulated to analysis forming process，filling situation, temperature distribution and equivalent strain distribution of pre-forging and final forging parts, and the three-turn crankshaft balance block was not fully filled. The reason was that the metal was hard to fill the “high rib and thin wall” balance block cavity and it was easier to flow out from the bridge with less resistance to form flash. On this basis, a modified process scheme was proposed to add a resistance wall structure in the local part of die. The numerical simulation results show that the filling effect of pre-forging and final forging parts is effectively improved. Finally, the process experiment was carried out with the modified process scheme of adding resistance wall, and the results show that the forgings are fully filled and no forging defects.

Funds：

乐山市科技局重点研究项目（21GZD029）

作者简介：袁磊（1986-），男，硕士，讲师，E-mail：yuanlei11@163.com

Reference：

[1]岳镇，周久红，蔡宏伟，等. 某三缸曲轴自动线锻造工艺开发实例[J]. 金属加工：热加工，2018，(11)：12-15.

Yue Z, Zhou J H, Cai H W, et al. Development example of forging process used in a three-cylinder crankshaft automatic production lines [J]. MW Metal Working, 2018, (11): 12-15.

[2]王林春，王开坤，李亨.S34MnV锻造曲轴调质处理数值模拟研究[J].热加工工艺，2021，50（12）：125-128,131.

Wang L C, Wang K K,Li H. Study on numerical simulation of S34MnV forged cramkshaft during quenching and tempering[J]. Hot Working Technology,2021,50(12):125-128,131.

[3]Wang X X, Qi Z C, Chen K, et al. Study on the forming accuracy of the three-cylinder crankshaft using a specific die with a preformed dressing [J]. International Journal of Advanced Manufacturing Technology, 2019, 104(1-4):551-564.

[4]舒鸫鹏. 基于Deform的汽车发动机曲轴模锻数值模拟及模具优化[J]. 热加工工艺，2019，48（3）:173-175.

Shu D P. Numerical simulation and die optimization of automotive engine crankshaft die forging based on Deform [J]. Hot Working Technology, 2019, 48(3): 173-175.

[5]郑书华，占斐龙. 基于Deform的飞边槽结构参数对曲轴平衡块模锻质量的影响[J]. 热加工工艺，2018，47(21)：187-190.

Zheng S H, Zhan F L. Influence of structural parameters of flash groove on die forging quality of crankshaft balance block based on Deform [J]. Hot Working Technology, 2018, 47(21): 187-190.

[6]朱颖，于洪兵，张亚岐，等. 连皮结构对曲轴模锻成形的影响[J]. 塑性工程学报，2018，25（6）：105-110.

Zhu Y, Yu H B, Zhang Y Q, et al. Influence of wad structure on die-forging of crankshaft [J]. Journal of Plasticity Engineering, 2018, 25(6): 105-110.

[7]周杰，张渝，安治国，等. 基于遗传算法的锻模阻力墙结构多目标优化设计[J]. 机械工程学报，2010，46（14）：85-90.

Zhou J, Zhang Y, An Z G, et al. Multi-objective optimization design of forging-die resistance wall structure based on genetic algorithm [J]. Journal of Mechanical Engineering, 2010, 46(14): 85-90.

[8]姬金金，周杰，卢先正. 某微车曲轴模具结构的优化[J]. 热加工工艺，2011，40（23）：231-234.

Ji J J, Zhou J, Lu X Z. Die structure optimization of minicar crankshaft die [J]. Hot Working Technology, 2011, 40(23): 231-234.

[9]周杰，舒锐志，卢先正，等. 一种双拔模加变斜面锻模结构参数优化设计[J]. 热加工工艺，2011，40（17）：19-22.

Zhou J, Shu R Z, Lu X Z, et al. Structural parameters design on forging die of a double-pull mode with variable slope [J]. Hot Working Technology, 2011, 40(17): 19-22.

[10]张渝，安治国，周杰. 曲轴锻模新型飞边结构的智能优化设计[J]. 重庆大学学报，2010，33（11）：70-76.

Zhang Y, An Z G, Zhou J. Intelligent optimization design of novel flash structure for crank-shaft forging dies [J]. Journal of Chongqing University, 2010, 33(11): 70-76.

[11]Zhang Y J, Hui W J, Dong H. Hot forging simulation analysis and application of microalloyed steel crankshaft[J]. Journal of Iron and Steel Research International, 2007, 14(5): 189-194.

[12]康凤，杨鄂川，林军,等. 曲轴用34CrNiMo6高强结构钢的热变形行为研究[J]. 材料导报，2013，27（4）：49-51，55.

Kang F, Yang E C, Lin J, et al. Study on hot deformation behavior of high strength construction steel 34CrNiMo6 for crankshafts [J].Materials Review, 2013, 27(4): 49-51，55.

Service：

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