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预弯工艺及摩擦系数对管材内高压成形的影响
英文标题:Influences of pre-bending process and friction coefficient on
作者:李彩霞 张晓峰 王敬 
单位:重庆工商职业学院 
关键词:管材预弯 内高压成形 摩擦系数 壁厚均匀性 贴模间隙 
分类号:TG394
出版年,卷(期):页码:2018,43(11):48-52
摘要:

针对汽车用变截面薄壁空心零件的内高压成形技术,为研究不同预弯工艺和摩擦系数对零件内高压成形质量的影响规律,采用有限元软件AUTOFORM进行数值模拟,对比分析了分别采用绕弯工艺、无内压支撑压弯工艺和有内压支撑压弯工艺,以及在内高压成形时模具与管材之间的不同摩擦系数,对零件成形后的最大减薄率、最大增厚率和最大贴模间隙的影响。结果表明: 采用有内压支撑压弯后的内高压成形零件较采用其他两种预弯成形工艺的零件,壁厚分布更均匀,最大贴模间隙更小,尺寸精度更高;同时,在内高压成形时,模具与管材之间的摩擦系数越小,材料流动性就越好,壁厚分布更均匀,零件最大贴模间隙越小。

For the technology of hydroforming of thin-walled hollow parts with variable cross section for automobile, in order to study the influences of different pre-bending processes and friction coefficient on the hydroforming quality of part, the influences of the rotation bending process, the bending process without internal pressure support and the bending process with internal pressure support, and different friction coefficients between die and tube during the hydroforming on the maximum thinning rate, the maximum thickening rate and the maximum gap between die and tube were analyzed comparatively by the finite element software AUTOFORM. The results show that under the bending process with internal pressure support, the wall thickness distribution is more uniform, the maximum gap between the die and the tube is smaller, and the dimension accuracy is higher than the other two kinds of pre-bending forming processes. Meanwhile, during the hydroforming process, the smaller the friction coefficient between die and tube is, the better the material fluidityis, the more uniform the wall thickness distribution is, and the smaller the maximum gap between die and tubeis.

基金项目:
重庆市教委科学技术研究项目(KJ1503911)
作者简介:
李彩霞(1984-),女,硕士,副教授,E-mail:cqlicx@163.com
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