超临界CO_(2)微量润滑铣削Al-42wt% Si合金切削加工性研究

Study on Milling Performance of Al-42wt% Si Alloy with Supercritical CO_(2) Minimum Quantity Lubrication

本文开展Al-42wt%Si合金超临界CO_(2)微量润滑(scCO_(2)-MQL)铣削适用性研究,进行干切削、超临界CO_(2)(scCO_(2))和scCO_(2)-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:scCO_(2)-MQL方法可有效减小切削力,采用scCO_(2)-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。scCO_(2)-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。

The applicability of supercritical CO_(2)micro lubrication(scCO_(2)-MQL) milling of Al-42 wt% Si alloy is studied, and the experiments of dry cutting, supercritical scCO_(2)and scCO_(2)-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 scCO_(2)-MQL method can effectively reduce the cutting force.At the same time, when using scCO_(2)-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 scCO_(2)-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.