锻压技术

氮气弹簧缸筒热反挤压凸模结构对挤压成形力的影响

英文标题：Effect of hot backward extrusion punch structure of nitrogen spring cylinder on extrusion forming force

单位：北京机电研究所有限公司上汽通用五菱汽车股份有限公司海安北京机电研究所锻压产业研发中心常州市东力机械有限公司

分类号：TG376.2

出版年,卷(期):页码：2021,46(5):109-115

摘要：

氮气弹簧缸筒的常用加工方式为机加工，为了提高材料利用率和生产效率、增强成形工件的性能，设计了一种热反挤压工艺以加工氮气弹簧缸筒。使用DEFORM11.0软件进行数值模拟，分析了坯料初始温度对成形结果的影响以及凸模结构对成形载荷的影响，设计了工艺过程并加工了挤压模具。采用热反挤压工艺加工的氮气弹簧缸筒的材料利用率为80.8%，相比机加工提高了47.6%，生产效率相比机加工提高了50%，取得了显著经济效益。结果表明，随着坯料初始温度的升高，成形载荷减小；随着凸模工作带高度以及凸模斜度的增大，成形载荷增大；当坯料初始温度为1200 ℃且凸模工作带高度为5 mm时，最大成形载荷为1652 kN，采用热挤压模具在2000 kN液压机上能够成形出符合设计要求的工件。

The common processing method of nitrogen spring cylinder is machining. In order to improve the material utilization rate and production efficiency, and enhance the performance of formed part, a hot backward extrusion process was designed to process the nitrogen spring cylinder. The numerical simulation was carried out by using DEFORM11.0 software. The effect of blank initial temperature on the forming result and the effect of punch structure on the forming load were analyzed. The technological process was designed and the extrusion die was processed. The material utilization rate of nitrogen spring cylinder processed by hot backward extrusion process is 80.8%, which is 47.6% higher than that of machining, and the production efficiency is 50% higher than that of machining. The significant economic benefits has been achieved. The results show that the forming load decreases with the increasing of blank initial temperature, and increases with the increasing of the height of working belt and the inclination of punch, the maximum forming load is 1652 kN when the blank initial temperature is 1200 ℃ and the height of working belt of punch is 5 mm, the workpiece which meets the design requirements can be formed by using the hot extrusion die on the 2000 kN hydraulic press.

基金项目：

广西创新驱动发展专项课题（桂科AA18118040）；柳州市科技计划课题（2018AD50301）

张建波（1996-），男，硕士研究生 E-mail：937971364@qq.com 通讯作者：蒋鹏（1964-），男，博士，研究员 E-mail：jp1964@163.com

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