Transactions of Materials and Heat Treatment

Title：Influence of uneven temperature of blank on quality of backward extrusion part for high pressure cylinder

Authors： Zhao Changcai Hao Haibin Hu Limei Zhang Li

Unit： Yanshan University

KeyWords： high pressure cylinder uneven temperature of blank backward extrusion wall thickness difference lug

ClassificationCode：TG316.3

year,vol(issue):pagenumber：2019,44(6):88-96

Abstract：

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.

Funds：

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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