锻压技术

爪极精锻模具的耐久性研究

英文标题：Durability research on precision forging die for claw pole

分类号：TG316

出版年,卷(期):页码：2022,47(12):168-174

摘要：

为防止爪极精锻下模凸筋处产生局部尺寸偏差而导致模具过早失效，利用有限元分析了导致爪极精锻模具使用寿命低的原因，发现磨损失效是导致爪极精锻下模凸筋处易产生尺寸偏差的主要因素。基于爪极锻造模具型腔的特点，对成形工艺进行了改善，在爪极预锻上模设置与精锻下模凸筋位置和大小相对应的凸起，可有效降低精锻下模凸筋处的温度、相对滑动速度和接触应力，使单个锻次的磨损量由优化前的1.08×10-5 mm减小为3.65×10-6 mm，且优化后的锻件未出现折叠、湍流和涡流等缺陷。根据该优化方案加工出模具并进行实际生产验证，结果显示，该优化方案使爪极精锻下模的平均使用寿命由优化前的5000件提高至6000件。

In order to prevent the premature failure of die caused by the local dimensional deviation at the convex rib of lower die for claw pole precision forging, the reasons for the low service life of precision forging die for claw pole were analyzed by the finite element method, and it was found that the wear failure was the main factor causing the dimensional deviation at the convex rib of lower die for claw pole precision forging. Then, based on the characteristics of forging die cavity for claw pole, the forming process was improved, and the protrusion corresponding to the position and size of convex rib in the precision forging lower die was set in the pre-forging upper die for claw pole, which could effectively reduce the temperature, relative sliding speed and contact stress at the convex rib of precision forging lower die, and make the wear amount of a single forging pass from 1.08×10-5 mm before optimization reduce to 3.65×10-6 mm. Furthermore, the improved forgings had no defects such as folds, turbulence and eddy currents, and according to the optimized scheme, the die produced under the optimized scheme was verified in actual production. The results show that the optimized scheme increases the average service life of the precision forging lower die for claw pole from 5000 pieces before optimization to 6000 pieces.

基金项目：

国家自然科学基金资助项目（51874226）；西安市科技局科技创新引导项目（201805033YD11CG17）；陕西省重点研发计划项目(2018ZDXM-GY-120)

杨程(1976-)，男，博士，副教授 E-mail：yang.cheng@ stu.xjtu.edu.cn

参考文献：

[1]孙昊.汽车发电机爪极组合模具结构及工艺优化[D]. 镇江：江苏大学，2016.

Sun H.Optimization of Automobile Claw Pole Composited Die Structure and Process[D]. Zhenjiang: Jiangsu University, 2016.

[2]Yang C, Zhao S D, Zhang J. A single stage hot forging process and die sets of alternator poles[J]. International Journal of Material Forming, 2013, 6(4):511-517.

[3]王蕾.混合励磁发电机槽式爪极热锻冷挤成形关键技术研究[D]. 泉州：华侨大学，2018.

Wagn L.Key Technologies in Hot Forging and Cold Extrusion of Slot Claw Pole for Hybrid Excitation Generator[D]. Quanzhou: Huaqiao University, 2018.

[4]Gronostajski Z，Kaszuba M，Polak S，et al. The failure mechanisms of hot forging dies[J]. Materials Science and Engineering: A，2016，657：147-160.

[5]Kim D H，Lee H C，Kim B M，et al.Estimation of die service life against plastic deformation and wear during hot forging processes[J]. Journal of Materials Processing Technology, 2005, 166（3）: 372-380.

[6]Choi C, Groseclose A, Altan T. Estimation of plastic deformation and abrasive wear in warm forging dies[J]. Journal of Materials Processing Technology, 2012, 212（8）:1742-1752.

[7]张京.突缘类锻件复合挤压过程数值模拟及工艺优化研究[D].长春：长春理工大学，2019.

Zhang J. Numerical Simulation and Process Optimization Study on Co-extrusion Process for Flange Forgings[D]. Changchun: Changchun University of Science and Technology, 2019.

[8]蔡力钢，刘海东，程强，等.基于正交试验法的模锻模具磨损分析及优化[J].北京工业大学学报，2020，46（1）：1-9.

Cai L G, Liu H D, Cheng Q, et al. Analysis and optimization of die forging wear based on orthogonal test method[J]. Journal of Beijing University of Technology, 2020，46（1）：1-9.

[9]张丝雨.最新金属材料牌号、性能、用途及中外牌号对照速用速查实用手册[M]. 北京：中国科技文化出版社，2005.

Zhang S Y. The Latest Metal Material Brand, Performance, Use and Comparison Between Chinese and Foreign Brands Quick Reference Practical Manual[M]. Beijing: China Science, Technology and Culture Press,2005.

[10]Lee R S，Jou J L.Application of numerical simulation for wear analysis of warm forging die[J].Journal of Materials Processing Technology，2003，140（1）：43-48.

[11]Wei K，Zhan M，Fan X，et al.Unequal-thickness billet optimization in transitional region during isothermal local loading forming of Ti-alloy rib-web component using response surface method[J].Chinese Journal of Aeronautics，2018，31（4）：845-859.

[12]Zhang Y，Shan D，Xu F.Flow lines control of disk structure with complex shape in isothermal precision forging[J].Journal of Materials Processing Technology，2009，209（2）：745-753.

服务与反馈：

【本网站尚未开通全文下载服务】【加入收藏】