【摘要】 当前企业生产中多采用切削液辅助车削42CrMo钢，存在断屑难和环境污染重的问题，相比于切削液冷却方式，微量润滑体现出低成本、低资源消耗和洁净无毒等诸多优势，成为研究的热点。为了探究微量润滑技术是否可以替代切削液冷却方式并且获得更优的断屑效果，基于双喷头微量润滑的冷却装置，采用单独前刀面、单独后刀面和前、后刀面同时微量润滑三种冷却方式，与传统切削液辅助加工进行对比，分析冷却方式对车刀断屑效果的影响，并结合切削力与加工表面形貌确定最优冷却方式。试验结果表明，前、后刀面同时微量润滑的方式效果最优，相比传统切削液冷却方式，前、后刀面同时微量润滑的方式所获得的切屑长度可缩短35.9%,切削合力降低14.7%,加工表面粗糙度降低34.7%。因此在车削42CrMo钢时，微量润滑技术在设备空间允许的条件下可考虑作为一种更高效洁净的冷却润滑手段。更多还原

【Abstract】 At present, cutting fluid is often used to assist turning 42CrMo, which is difficult to break chips and causes heavy environmental pollution.Compared with the cooling mode of cutting fluid, minimum quantity lubrication shows many advantages such as low cost, low resource consumption, clean and non-toxic, and it has become a research hotspot.In order to explore whether MQL can replace cutting fluid and obtain better chip breaking effect, this paper adopts three cooling methods based on the double nozzle MQL cooling device: MQL on single rake face, MQL on single flank face and simultaneous MQL on the rake face and the flank face.Compared with the traditional coolant assisted machining, the influence of cooling mode on chip breaking effect of cutting tool is analyzed, and the optimal cooling mode is determined by combining the cutting force and machining surface topography.The test results show that the method of simultaneous MQL on the rake face and the flank face shows the best effect among the above three methods.Compared with the traditional cutting fluid cooling method, the chip length can be shortened by 35.9%,the cutting force can be reduced by 14.7%,and the machined surface roughness can be reduced by 34.7%.Therefore, when turning 42CrMo steel, minimum quantity lubrication technology can be considered as a more efficient and cleanner means of cooling and lubrication when the equipment and space are allowed.更多还原