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采用TiCN/Al_2O_3涂层球头铣刀对天然理石进行高效铣削试验,利用扫描电子显微镜(SEM)观察涂层刀具的表面磨损形貌并基于能谱检测(EDS)分析刀具表面元素组成,并探讨刀具的磨损机制。研究结果表明,刀具磨损包括黏结磨损、磨粒磨损、氧化磨损和疲劳磨损;涂层刀具开始切削时,刀具后刀面出现粘结物和擦伤,在断续切削冲击的作用下造成后刀具材料的剥落;切削线速度较低时,切削系统振动增强,疲劳裂纹在基体内部的扩展降低了刀具基体强度,极易导致较大面积凿削式磨粒磨损,当切削线速度增大时,稳定阶段的磨损形式由凿削式磨粒磨损转变为擦伤式磨粒磨损,刀具磨损减轻;微振磨损的综合作用加剧了涂层刀具磨损,破坏涂层刀具的切削性能。
The TiCN / Al_2O_3 coated ball-end milling cutter was used to carry out high-efficiency milling test on natural marble. The surface wear morphology of the coated tool was observed by scanning electron microscope (SEM) and the elemental composition of the tool surface was analyzed by EDS Explore the tool wear mechanism. The results show that the tool wear includes bonding wear, abrasive wear, oxidative wear and fatigue wear. When the coating cutter starts cutting, the cutter flank sticks and scratches, resulting in intermittent cutting impact after the tool Material exfoliation; cutting line speed is low, the cutting system vibration enhanced, fatigue crack growth within the matrix reduces the tool substrate strength, can easily lead to a larger area chisel type abrasive wear, when the cutting line speed increases, In the stable stage, the wear form changed from chisel abrasive wear to abrasive wear abrasive wear, tool wear reduced; the combined effect of fretting wear exacerbated the coating tool wear, damage the cutting tool cutting performance.