锻压技术

离合器毂齿滚打成形损伤裂纹的预测及工艺改进特种成形

英文标题：Prediction of damage cracks and process improvement in roll-beating for clutch hub teeth

单位：1.天津工业大学机械工程学院 2.天津工业大学工程教学实习训练中心 3.天津市天海同步科技有限公司

分类号：TG335

出版年,卷(期):页码：2024,49(6):161-171

摘要：

针对离合器毂齿在滚打成形后沿毂齿侧壁根部容易出现局部裂纹的问题，采用数值模拟和实验相结合的方法分析了裂纹的产生机理。对离合器毂齿材料S420MC钢进行拉伸实验，得到其应力-应变曲线，结合ABAQUS中建立的材料本构模型，得到材料应力三轴度-断裂应变对应关系，并采用模拟退火算法确定了Johnson-Cook材料损伤起始准则参数。基于ABAQUS联合韧性损伤起始准则和Johnson-Cook材料损伤起始准则进行模拟，发现毂齿根部的裂纹与实际情况相同，通过工艺参数优化，消除了工件的裂纹。最后，基于优化后的工艺参数进行实际生产加工，工件未出现裂纹。优化工艺在保证产品质量的同时，提高了生产效率。

For the problem of local cracks easily appeared along the root of hub tooth sidewall after roll-beating of clutch hub teeth, the generation mechanism of cracks was analyzed by the combination method of numerical simulation and experiment. The tensile experiment of S420MC steel material for the clutch hub teeth was conducted, and the stress-strain curve was obtained. Combined with the constitutive model of material established in ABAQUS, the corresponding relationship between stress triaxiality and fracture strain was obtained. Furthermore, the parameters of Johnson-Cook material damage initiation criteria were determined by using the simulated annealing algorithm. Based on the combined toughness damage initiation criteria and Johnson-Cook material damage initiation criteria in ABAQUS, it is found that the cracks in the root of hub tooth are consistent with the actual situation. Through the optimization of process parameters, the cracks of workpiece are eliminated. Finally,the actual production were carried out based on the optimized process parameters, and there were no cracks in the workpiece. Thus, the optimized process not only guarantees the product quality, but also improves the production efficiency.

基金项目：

教育部高等学校工程训练教学指导委员会教育科学研究项目（JJ-GX-JY202134）

作者简介：刘健（1985-），男，工学博士，高级实验师,E-mail：liujian3286@126.com;通信作者：薛锐（1987-），男，学士，工程师,E-mail：xuerui@tanhas.com

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