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以ABAQUS/Explicit仿真软件为平台,建立了夹具自转与锤头公转的两种钛合金线材旋锻有限元模型,介绍了两种模型的接触、运动等边界条件的设定。对比仿真结果,分析了夹具随动和夹具固定两种情况所成形的线材椭圆度存在差异的原因。采用数值仿真手段,分析了两种模型模拟结果的径向应力、应变和直径差,并比较了两种模型在不同质量缩放系数下的计算时间。结果表明:锤头公转模型的求解时间明显小于夹具自转模型的求解时间,锤头公转模型的直径差以及成形的组织均匀性较夹具自转模型的更优,因此,锤头公转模型较夹具自转模型更适合于钛合金线材成形的模拟分析。另外,根据两种模型的仿真对比结果,对锤头公转模型进行了实验验证,其实验结果与仿真效果能够一一对应,说明建立的数值仿真方法能用于指导实际生产。
Based on the ABAQUS / Explicit simulation software, the finite element model of two kinds of titanium alloy wire swivel with the fixture rotation and the revolution of the hammer was established. The boundary conditions of contact and movement of the two models were introduced. Comparing the simulation results, the reasons for the differences in the ellipticity of the wire formed by the two modes of fixture follow-up and fixture fixation are analyzed. The numerical simulation method was used to analyze the radial stress, strain and diameter difference of the two models. The calculation time of the two models under different mass scaling coefficients was also compared. The results show that the solution time of hammer revolution model is obviously smaller than that of jig rotation model, and the diameter difference of hammer revolution model is better than that of jig rotation model. Therefore, More suitable for titanium alloy wire forming simulation analysis. In addition, based on the simulation results of the two models, the experimental verification of the revolution model of hammerhead is carried out. The experimental results and the simulation results can correspond one by one, which shows that the numerical simulation method can be used to guide the actual production.