钛合金线材旋锻数值仿真中夹具与锤头相对运动的处理方法

Treatment methods on relative motion between clamp and hammer in numerical simulation of rotary forging for titanium alloy wire

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。

Two kinds of rotary forging finite element models of clamp rotation and hammer revolution for titanium alloy wire were estab- lished by the ABAQUS/Explicit simulation software, and the determining on the boundary conditions of contact and movement of two mod- els was introduced. Based on the simulation results, the causes of ellipticity differences of the wire formed by clamp rotation and clamp fixed were analyzed. Then, the radial stress, strain and diameter difference of two models were analyzed by means of numerical simula- tion, and the calculation time of two models under different mass scaling coefficients was compared. The results show that the calculation time by the hammer revolution model is significantly less than that of clamp rotation model, and the diameter difference and forming struc- ture uniformity by the hammer revolution model is better than that of clamp rotation model. Therefore, the hammer revolution model is suitable for the simulation analysis of rotary forging for titanium alloy wire. In addition, according to the simulation results of two models, the hammer revolution model is verified by the experiment results, which are consistent with the simulation results. Thus, the established numerical simulation method can guide the actual production.