【摘要】 本文开展Al-42wt%Si合金超临界CO₂微量润滑（scCO₂-MQL）铣削适用性研究，进行干切削、超临界CO₂（scCO₂）和scCO₂-MQL铣削实验，通过全因素实验分析切削参数与冷却润滑方式对切削力、表面形貌的影响。结果表明：scCO₂-MQL方法可有效减小切削力，采用scCO₂-MQL加工Al-42wt%Si合金时宜采用较低的每齿进给量。对比可得，采用干铣削Al-42wt%Si合金时，切削速度为50m/min、每齿进给量为0.01mm/z的工件表面质量最好，其表面粗糙度值为0.321μm。scCO₂-MQL方法对高硅铝合金加工的适用性与硬质颗粒质量分数、铝基体表面形成特征有关。更多还原

【Abstract】 The applicability of supercritical CO₂ micro lubrication（scCO₂-MQL） milling of Al-42 wt% Si alloy is studied, and the experiments of dry cutting, supercritical scCO₂ and scCO₂-MQL milling are carried out.The effects of cutting parameters and cooling and lubrication methods on cutting force and surface morphology are analyzed by all factor experiment.The results show that scCO₂-MQL method can effectively reduce the cutting force.At the same time, when using scCO₂-MQL to process Al-42 wt% Si alloy, it is appropriate to use a lower feed rate per tooth.By comparison, when dry milling Al-42 wt% Si alloy is adopted, the cutting speed is 50 m/min and the feed rate per tooth is 0.01 mm/z, the surface quality of the workpiece is the best, and its surface roughness value is 0.321μm.The applicability of scCO₂-MQL method to the processing of high silicon aluminum alloy is related to the weight percentage of reinforced particles and the surface formation characteristics of aluminum substrate.更多还原