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利用高速充液旋压技术加工出直径为6mm的沟槽管;然后,采用多级拉拔成形方法加工出直径为3～6mm的微型直齿沟槽铜管。在分析其加工成形机理的基础上,重点研究拉拔工艺参数对沟槽管成形的影响规律。结果表明:在微型直齿沟槽铜管成形过程中,随着拉拔成形直径的缩小,壁厚增加,槽深和槽宽均减小;同时,壁厚随着拉拔模具角的增加而减小,而槽深和槽宽随着拉拔模具角的增加而增加;随着拉拔级次压缩率的增大,拉拔力增大,过大的拉拔级次压缩率会导致微型直齿沟槽铜管拉拔成形轴向沟槽产生断裂。随着拉拔模具角的增大,拉拔力先减小后增大,并且存在一个最小值区域。当拉拔模具角α=16°时,拉拔力最小,此为最佳拉拔模具角。
The use of high-speed filling spinning technology to produce a diameter of 6mm trench tube; then, using multi-stage drawing method for processing a diameter of 3 ~ 6mm micro-straight grooved copper tube. Based on the analysis of its forming mechanism, the influence of drawing parameters on the forming of grooved tube is studied emphatically. The results show that the groove depth and groove width decrease with the decrease of drawing diameter and the increase of wall thickness in the process of micro-spur groove copper tube forming. Meanwhile, with the increase of drawing die angle Decreases, while the groove depth and groove width increase with the increase of the drawing die angle; as the drawing stage compression rate increases, the drawing force increases, excessive drawing stage compression rate will lead to micro Straight groove grooved copper tube drawing the formation of axial groove fracture. As the angle of the drawing die increases, the drawing force first decreases and then increases, and there is a minimum area. When the drawing die angle α = 16 °, the pulling force is the smallest, which is the best drawing die angle.