Integral structural parts of titanium alloy have high material removal rate, high machining difficulty and need multi-step machining to form the final geometry. The crystallographic texture of machined surface layer will affect the surface quality and the mechanical performance of machined parts from the microstructural aspect. Therefore, high requirements for finish machining surface quality and a reasonable high-quality machining surface-oriented process adjustment method need to be explored. In this paper, the surface quality controlling methods of titanium alloy machining are theoretically analyzed, two machining process adjustment methods in terms of multi-step cutting and prestressed cutting are proposed, and the finite element simulation of multi-step cutting and prestressed cutting was carried out. According to the principle of crystallographic texture and the obtained shear strain and strain rate data by finite element simulation, the crystallographic texture of surface layer materials processed by single-step cutting, single-step prestressed cutting, multi-step cutting and prestressed multi-step cutting were simulated by viscoplastic self-consistent (VPSC) texture simulation program. The influence of cutting process adjustment method on the texture polar figures (texture type and texture density) and crystallographic orientation distribution function (ODF) diagram of machined surface was analyzed. Moreover, the experimental comparisons and validations of simulated results were conducted by orthogonal cutting tests and microstructural texture measurements by using electron backscatter diffraction (EBSD) technique.

钛合金整体结构件材料去除率高，加工难度大，需要多步加工才能形成最终几何形状。加工表面层的结晶织构从微观结构方面影响加工零件的表面质量和机械性能。因此，需要探索对精加工表面质量的高要求和合理的高质量加工表面导向工艺调整方法。本文对钛合金加工表面质量控制方法进行了理论分析，提出了多步切削和预应力切削两种加工工艺调整方法，并进行了多步切削和预应力切削的有限元模拟。出去。根据晶体织构原理和有限元模拟得到的剪切应变和应变率数据，对单步切削、单步预应力切削、多步切削和预应力多步加工的表层材料的晶体织构进行了分析。通过粘塑性自洽（VPSC）纹理模拟程序模拟切割。分析了切削工艺调整方法对加工表面织构极坐标图（织构类型和织构密度）和晶体取向分布函数（ODF）图的影响。此外，通过正交切割测试和使用电子背散射衍射（EBSD）技术的微观结构纹理测量，对模拟结果进行了实验比较和验证。