【摘要】 金刚石涂层拉拔模具以其优异的性能(高硬度、高耐磨性、低摩擦系数等)逐渐成为线材及管材高速拉拔行业中新一代的拉拔模具。为深入研究金刚石涂层拉拔模具对铜材拉拔过程的影响,借助非线性有限元分析对其进行模拟仿真,分析了拉拔过程中铜材及金刚石涂层模具的轴向及径向应力分布规律。通过正交实验法研究了铜材不同压缩率时金刚石涂层拉拔模具参数(工作锥半角α,过渡圆弧半径R,定径带长度L)对铜材拉拔过程的影响,得到了最佳的拉拔模具孔型参数(压缩率为13.7%时,α=6°,R=4 mm,L=4.5 mm;压缩率为25.8%时,α=7°,R=3 mm,L=4.5 mm),并采用极差分析与方差分析方法对模拟结果进行分析,得到了不同压缩率时各影响因素对铜材表面轴向残余应力和涂层模具最大等效应力的影响规律。应用实验表明,孔型参数优化后的金刚石涂层拉拔模具的工作寿命是硬质合金模具的10倍。这对于金刚石涂层拉拔模具的推广应用有非常重要的意义。更多还原

【Abstract】 In the tube and wire high velocity drawing area,the diamond-coated drawing die is becoming the next generation of drawing dies for its excellent properties,such as high hardness,good wear resistance,and low friction coefficient.In order to investigate the influence of parameters of diamond-coated drawing dies upon the drawing of copper wires,the nonlinear finite element analysis was used to simulate the whole copper wires drawing process.The distributions of the axial stress and radial stress on drawn wires and dies were analyzed. Then the orthogonal experiment was conducted to investigate the influence of parameters of diamond-coated drawing dies(the semi-angle of drawing diesα,the radius of transition arc R,the length of bearing part L) upon the copper wires drawing process with different compressibility.The optimal parameters(for compressibility 13.7 %,α=6°,R=4mm,L=4.5 mm;for compressibility of 25.8 %,α=7°,R=3 mm,L= 4.5 mm)of diamond-coated drawing dies were gained.Based on the range analysis and variance analysis of the simulation results,the influence rules of experiment factors upon theaxial residual stress of copper wires and the maximum equivalent stress of diamond-coated drawing dies were revealed.Compared with cemented carbide drawing dies,the results of application experiments showed that the working lifetime of optimal diamond-coated drawing dies could be increased by a factor of 10.This is of great significance for the extensive application of diamond-coated drawing dies.更多还原