Transactions of Materials and Heat Treatment

Title：Effect of hot backward extrusion punch structure of nitrogen spring cylinder on extrusion forming force

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ClassificationCode：TG376.2

year,vol(issue):pagenumber：2021,46(5):109-115

Abstract：

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.

Funds：

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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