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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 the thin-walled copper tube after drawing, the influence of different drawing processes on the forming properties of the thin-wall copper tube was discussed. Finite element models of the two drawing forming processes were established respectively by the finite element software MARC, Brass fixed core drawing and swimming core pulling on the drawing force, the brass drawing equivalent stress, strain and residual stress. The results show that under the same process parameters, the pulling force required for drawing the floating core is obviously smaller than that of the fixed core drawing, the equivalent stress is relatively smaller, the equivalent strain is equal, and the residual stress in the axial direction And the circumferential smaller and more evenly distributed, in the radial approach to zero. Regardless of other factors, swimming core pulling more help to improve the quality of thin-walled brass products.