TC4钛合金磨削机理和仿真研究

Study on Grinding Mechanism and Simulation of TC4 Titanium Alloy

Ti-6Al-4V(TC4)钛合金属于航空航天构件中广泛应用的难加工的材料,其磨削加工表面质量具有较高的要求,磨具与钛合金表面的接触过程十分复杂。为探索其微观磨粒磨削中的切削力、切削温度、切屑形态等变化,开展TC4钛合金三维单颗磨粒磨削加工机理及仿真技术研究。基于磨削基础理论及钛合金材料性能,分析建立单颗磨粒磨削加工物理运动模型,利用ABAQUS开展磨削参数正交仿真,研究不同磨削线速度、磨削深度及磨粒负前角作用下的磨削动态过程机理。研究结果表明,磨粒负前角γ与磨削深度a;对磨削力和磨削温度具有显著影响,磨粒切入阶段磨削力升高较快,切出阶段磨削力降低变缓;工件磨削温度加速升高,达到峰值后缓慢降低;大负前角作用下,沟槽处材料塑性隆起减小,提高加工表面质量。

As the typical difficult-to-machine material, Ti-6 Al-4 v titanium alloy(TC4) is widely used in aerospace components which require high surface quality. But the contact during the grinding process between the grinding tool and TC4 workpiece surface is very complicated. In order to explore the variation of grinding force, temperature, and chip shape in the micro single grain grinding process, its mechanism and simulation technique are studied in this manuscript. Firstly, based on the basic grinding theory and properties of titanium alloy, the motion model of single grain was established. And the orthogonal simulation experiments were carried out using ABAQUS to study the dynamic grinding mechanism under different parameters conditions(grinding linear velocity, depth and negative rake angle). The simulation and experiment results show that the negative rake angle and grinding depth have a significant effect on grinding force and temperature. The grinding force increases rapidly in the cut-in stage, and decreases slowly in the cut-out stage. The grinding temperature of the workpiece increases rapidly and decreases slowly after reaching the peak value. Under the condition of a large negative rake angle, the material plastic upheaval in the groove decreases, and the surface quality is improved.