SiCp增强铝基复合材料切削加工中刀—屑摩擦模型及其磨损性能研究

通过分析ＳｉＣ颗粒增强铝基复合材料切削过程中刀具与切屑之间的摩擦特点，经过某些合理简化，提出了以紧密接触为主要特征的摩擦特性方程式，通过与切削试验及计算机仿真结果对比，验证了该公式的合理性；并采用ＳＥＭ等手段分析了ＳｉＣ颗粒及晶须增强铝基复合材料及刀具的磨损机理。结果表明：复合材料的耐磨性能优于铝合金；Ｋ类硬质合金刀具有可用于粗加工和半精加工，并须用较低切削速度和较大进给量；而精加工时须采用聚晶金

A Study on a Friction Formula between Tool and Chip and Wear Characteristics when Cutting SiC Reinforced Aluminum Composite

Upon the analysis of the friction features at the interface between tool and chip in the cutting process of aluminum composite reinforced with SiC particle or SiC whisker, a friction formula characteristic of close contact is presented and verified. The wear mechanisms of the cutting tools and the machined composites were analyzed with SEM. Compared with the results of the cutting experiments and the computer simulation, it has been found that the real friction condition at the interface between tool and chip can be well described by the formula. The wear resistance of the aluminum based composites is better than that of aluminum alloy matrix. The cutting tool made of K type cemented carbides is suitable for crude and semi precise machining. At a small cutting speed and larger feed of precise machining, PCD tool is the best cutting tool candidate.