锻压技术

坯料温度不均对高压气瓶反挤压件质量的影响

英文标题：Influence of uneven temperature of blank on quality of backward extrusion part for high pressure cylinder

作者：赵长财郝海滨胡丽梅张立

单位：燕山大学

分类号：TG316.3

出版年,卷(期):页码：2019,44(6):88-96

摘要：

通过热压缩实验，得到了34CrMo4合金钢的应力-应变曲线，并根据此曲线建立了材料的峰值应力模型，即Z参数模型。同时，在高压气瓶反挤压工艺中，设置了坯料初始温度不均匀模型。基于有限元模拟技术，应用DEFORM-3D数值模拟软件,对坯料温度不均模型的反挤压过程进行了模拟计算。测量了成形件凸耳及壁厚差的大小，分析了坯料初始温度不均对热反挤压成形件凸耳及壁厚分布的影响。研究表明：随着初始坯料高低温度差的逐渐增大，凸耳高度增大，最大壁厚差也增大；随着反挤压的进行，凸耳高度迅速增加，到凸模下压量达到90%时，凸耳高度增长速度减缓；从反挤压件口部到底部，壁厚差逐渐减小。

The stress-strain curve of 34CrMo4 alloy steel was obtained through thermal compression experiments, and the peak stress model, that is Z parameter model, was established based on the curve. A uneven initial temperature model of
blank in back extrusion process of high pressure cylinder was set up. Based on finite element simulation technology, the DEFORM-3D numerical simulation software was used to simulate the backward extrusion process of blank temperature uneven model. The lugs and wall thickness difference of formed part were measured, and the influence of uneven initial temperature of blank on the lug and wall thickness distribution in hot backward extrusion was analyzed. The results show that as the initial temperature difference of blank increases, the lug height difference increases,and the maximum wall thickness difference increases.As the backward extrusion process goes on, the lug height increases rapidly, and the growth rate of lug height slows down when the press amount of punch reaches 90%. And the difference of wall thickness decreases gradually from the top to the bottom of the backward extrusion part.

基金项目：

赵长财（1964-），男，博士，教授，博士研究生导师 E-mail：zhao1964@ysu.edu.cn 通讯作者：郝海滨(1976-)，男，博士，副教授 E-mail：hbhao@ysu.edu.cn

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