锻压技术

螺栓连接模压成形防松研究及数值模拟分析

英文标题：Numerical simulation analysis and research on loosening prevention of bolt connection in mold forming

作者：姚秋华李儒彬汤芳

单位：中车株洲电机有限公司

关键词：双螺母模压成形防松工艺裂纹 DEFORM-3D

分类号：TG376

出版年,卷(期):页码：2019,44(12):70-76

摘要：

根据某型电机定子铁心双头螺栓的防松要求，提出采用双螺母和用不同模具组合分别对工艺螺母、螺栓外螺纹进行径向模压成形的防松方案。采用手动油压式模压工具装配1#和2#模具，并在设定的工艺参数下分别对螺栓外螺纹和工艺螺母进行径向模压成形，螺栓外螺纹圆周每隔90 °有一处模压成形，工艺螺母圆周有一处模压成形。同时，对模压成形质量进行渗透和磁粉探伤、剖切微观检查，结果显示：螺栓和工艺螺母未产生裂纹。利用DEFORM-3D有限元软件对模压成形过程进行数值模拟，分析了工艺螺母和螺栓的受力及变形情况，工艺螺母最大应力为761 MPa，螺栓最大应力为382 MPa，均小于各对应材质本身的抗拉强度，不会产生裂纹破坏。试验和仿真结果表明，模压仿真与实物模压效果一致，工艺螺母和螺栓均未产生裂纹，防松效果能够满足使用要求。

Based on the requirements of loosening prevention for one type of motor stator core stud bolt, a scheme of loosening prevention for the radial mold forming of process nut and external thread of bolt respectively was put forward by the double nuts and the combination with different molds, and 1# and 2# molds were equipped by the manual hydraulic molding tools. Then, the external thread of bolt and the process nut were formed by radial molding under the setting process parameters respectively. Therefore, the external thread circumference of bolt was molded at intervals of 90°, and the circumference of process nut was molded once. At the same time, the quality of mold forming was inspected by the magnetic detection and penetration testing and the micro-cutting inspection. The results show that no cracks are found in bolts and process nuts. Furthermore, the mold forming process was simulated by finite element software DEFORM-3D, and the stress and deformation of process nuts and bolts were analyzed, namely, the maximum stresses of process nut and bolt are 761 MPa and 382 MPa, respectively. Thus, the above values are all less than the tensile strength of each corresponding material, and the process nuts and bolts do not crack. The experiment and simulation results show that the mold forming simulation results are consistent with the actual mold forming results, and the process nuts and bolts do not crack. Finally, the effect of loosening prevention can effect meet the requirements of use.

基金项目：

国家重点研发课题项目（2016YFB1200506-15）

姚秋华（1983-），男，硕士，高级工程师 E-mail：kevin_yqh@126.com

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