钛合金高方盒形件拉深新方法

New deep drawing method for titanium alloy high square box parts

为了解决现行高方盒形件成形效率低、生产成本高等问题,提出一种新的成形工艺——锥形与方形组合凹模成形工艺。运用Qform2D/3D、V7分别在传统的辐射状和新工艺的锥形与方形组合凹模中模拟板材高方盒形件拉深成形过程,并据M-K失稳准则和Hill48判据损伤评价研究力的规范、应力-应变状态。分析结果表明:对于高方盒形件拉深成形,采用传统辐射状凹模拉深平均应力较锥形-方形组合凹模中拉深平均应力大10%,此时,在组合凹模中最大变形程度位置平均应变较传统辐射状凹模小16%,新成形工艺提高了变形均匀性。同时,板材在组合凹模中采用压边圈条件下,仅要一段锥形与一段方形的组合凹模,经一个工步成形高方盒形件;在不使用压边圈条件下,可用两段锥形与一段方形的组合凹模,经一个工步成形高方盒形件。这一研究成果为类似零件在拉深过程中免除中间退火工序、实现自动化生产线创造了条件。

In order to solve the problems of low forming efficiency and high production cost for high square box parts,a new forming process of conical and square combined die forming process was proposed.The deep drawing process of high square box part for sheet metal was simulated by using Qform2 D/3 D and V7 in the traditional radial die and the new process of conical and square combined die respectively,and the specification of force and the stress-strain state were studied according to the M-K instability criterion and Hill48 criterion damage evaluation.For the deep drawing of high square box part,the analysis results show that the average stress of deep drawing with the traditional radial die is 10% larger than that with the conical and square combined die,and the average strain with the conical and square combined die is 16% smaller than that with the radial die at the maximum deformation position.The deformation uniform is improved by the new forming process.Meanwhile,when the blank holder is used in the combined die of sheet,the combined die with only one conical section and one square section is needed to form a high square box part in one step,and under the condition without blank holder,the high square box part can be formed by the combined die with two conical sections and one square section in one step.Thus,the above research results create conditions for eliminate the intermediate annealing process in the deep drawing process for similar parts and realize automatic production line.