锻压技术

薄壁铜管固定芯头拉拔和游动芯头拉拔的对比分析

英文标题：Comparative analysis on fixedmandrel drawing and floatingmandrel drawing for thinwalled copper tube

作者：许永强姜志宏曾艳祥胡沛

单位：江西理工大学

分类号：TG394

出版年,卷(期):页码：2017,42(6):88-91

摘要：

为提高薄壁铜管拉拔后的成形质量，探讨不同拉拔工艺对薄壁铜管成形性能的影响，利用有限元软件MARC分别对两种拉拔成形工艺建立有限元模型，对比分析薄壁铜管固定芯头拉拔和游动芯头拉拔对拉拔力、铜管拉拔后等效应力、应变和残余应力的影响。结果表明：在相同工艺参数下，与固定芯头拉拔相比，游动芯头拉拔所需拉拔力明显更小，等效应力也相对更小，等效应变相等，残余应力在轴向和周向更小，且分布更均匀，在径向都趋近于0。在不考虑其他因素下，游动芯头拉拔更有助于提高薄壁铜管的产品质量。

In order to improve the forming quality of thinwalled copper tube after drawing, the influences of different drawing processes on formability of thinwalled copper tube were studied. Then, the finite element models for two kinds of drawing processes were established by finite element software MARC, and the influences of fixedmandrel drawing and floatingmandrel drawing for
the thinwalled copper tube on drawing force， equivalent stress and strain and residual stress after drawing were comparatively analyzed. The results show that under the same process parameters, comparing with the fixedmandrel drawing, the floatingmandrel drawing requires smaller drawing force, the equivalent stress is relatively smaller with equal equivalent strain, the residual stresses along the axial and circumferential directions are smaller and more uniform distribution, and the residual stresses in the radial direction are close to 0. However, the floatingmandrel drawing is helpful to improve the product quality of thinwall copper tube without considering other factors.

基金项目：

国家自然科学基金资助项目（50665003,51464017）

许永强（1992-），男，硕士研究生姜志宏（1977-），男，硕士，副教授

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