碳膜刀具干式钻削Al-Si合金的切削性能及其减摩机制

采用非平衡磁控溅射离子镀技术制备碳膜,通过对刀具后刀面磨损曲线、切削力以及所加工孔精度的分析,证明高硬度低摩擦因数碳膜高速钢刀具在干切削条件下钻削铝硅合金时具有良好的切削性能。同时采用OM、SEM、XPS和EDS等方法对切削过程中碳膜的减摩效应进行探讨,证明碳膜改善刀具抗粘结能力的本质在于碳元素对铝硅合金的润湿性较差,而非在摩擦过程中生成碳转移膜。切削过程中碳膜的热稳定性越好,碳膜刀具的寿命就越长,一旦碳膜破坏,则刀具迅速发生粘结失效。

Machinability and anti-adhesive wear performance of carbon coated tools in drilling of Al-Si alloy

Two kinds of carbon coatings with high hardness and low coefficient of friction were deposited by closed filed unbalanced magnetron sputtered ion plating techniques.By the analysis of flank wear,the cutting force curves and the dispersion of cutting holes and the carbon coated tools show excellent cutting performance in dry cutting of Al-Si alloys.Through OM,SEM,XPS and EDS,the low adherence of carbon coated tools can be attributed to the low wettability between the Al-Si alloys and carbon instead of forming carbon transfer film during wear.The higher the thermal stability of carbon coating is,the longer of the cutting tools life is.The catastrophic adhesive wear may occur once the carbon coating fails.