Abstract

Targeted at a composite material with a novel Ti-555 high-strength titanium alloy matrix developed using the method of "reinforcement wet grinding-spark plasma sintering-heat treatment", a study is conducted on the machining performance during the machining process. Orthogonal experiment method, single factor experiment comparison method and empirical model analysis method are adopted to explore the pattern of changes in cutting force, surface roughness and the wearing of cutting tools under different parameters. There are a number of points revealed by the experimental results as follows. In the machining process, due to the high-strength and hardness of the composite material with Ti-555 high-strength titanium alloy matrix, the selection of machining parameters is limited, and the highest machining speed reaches up to merely 45 m/min. Most affected by the depth of machining, the cutting force increases as machining depth and feed rate are on the rise. The empirical model of cutting force is constructed using the least square regression method, the level of significance is high as indicated by the F test method. and feed rate will make difference to surface roughness. Not only will a greater feed rate increase roughness value, it will also aggravate the wearing of the tool.

摘要

针对采用“强化湿磨-火花等离子烧结-热处理”方法研制的新型Ti-555高强钛合金基体复合材料，对其加工过程中的加工性能进行了研究。采用正交试验法、单因素试验比较法和经验模型分析法，探索不同参数下切削力、表面粗糙度和刀具磨损的变化规律。实验结果揭示了以下几点。在加工过程中，由于采用Ti-555高强钛合金基体的复合材料强度高、硬度高，加工参数的选择受到限制，最高加工速度可达45 m/min。受加工深度的影响最大，切削力随着加工深度和进给速度的增加而增加。采用最小二乘回归法构建切削力经验模型，F检验法表明显着性水平较高。和进给速度会对表面粗糙度产生影响。更大的进给率不仅会增加粗糙度值，还会加剧刀具的磨损。