纯钛半球形零件拉深回弹影响因素分析

Analysis on drawing springback influencing factors for pure titanium hemispherical part

以0.6mm厚TAO纯钛薄板为研究对象,建立了符合实际的半球形零件拉深及回弹有限元模型,对半球形纯钛薄壁件拉深回弹过程进行了数值模拟研究,分析了工艺参数对回弹量的影响规律,并进行了相关的试验验证。结果表明:回弹量随着摩擦系数的增加而减小,摩擦系数小于0.14时,回弹量减少趋势明显,大于0.14时回弹量减少趋势变缓;回弹量随着单位压边力增大而减小,单位压边力小于1.4MPa时,回弹量变化显著,随着压边力的增大,回弹量减少趋势平缓;回弹量随凸凹模间隙的增大而增大。最后,在数值模拟的基础上进行了实际拉深试验,壁厚测试的实际结果与有限元模拟结果基本吻合,回弹后尺寸满足零件尺寸要求。

For TA0 pure titanium sheet with 0.6 mm thickness,the finite element models of actual hemispheric part deep drawing and springbaek were established,and their drawing springback processes were numerically simulated.Then,the related test verifications were conducted,and the influences of process parameters on springback amount were investigated.The results show that the springback amount reduces with the increasing of friction coefficient,and the springback amount decreases obviously when the friction coefficient is less than 0.14.However,when the friction coefficient is larger than 0.14,the springback amount decreases smoothly.Furthermore,the springbaek amount reduces with the increasing of unit blank holder force,and the springback amount changes significantly when the unit blank holder force is less than 1.4MPa.With the increasing of blank holder force,the springback amount decreases smoothly,and the springbaek amount increases with the increasing of clearance between punch and die.Finally,the actual drawing test is conducted on the basis of numerical simulation,the results of wall thickness test are basically consistent with the finite element simulation results,and the dimension after springback meets the size requirements of parts.