【摘要】 金属加工过程中，切屑周期性断裂有利于切削过程的稳定进行，实现高质高效加工。雾化射流是一种重要的冷却方式，把压缩空气与切削液混合并断续喷射形成雾状。与切削液溢流冷却相比，雾化射流射出的小液滴渗透性更好，冷却介质能更准确地施加到刀具前刀面和切屑内表面位置。为了探究雾化射流对42CrMo钢车削断屑性能的影响，采用三种冷却方式(干切削、切削液溢流及雾化射流)和两种进给量(0.15mm/r, 0.18mm/r)进行车削实验，对切屑的宏观长度、卷曲半径、切削力和刀—屑接触长度进行观测。在相同的进给量下，采用雾化射流冷却方式可以获得更短的切屑宏观长度、更小的切屑卷曲半径、更小的切削力、更短的刀—屑接触长度以及更小的切屑内表面粗糙度。更多还原

【Abstract】 In the metal processing, chip periodic fracture and break are conducive to the machining stability and the realization of high-quality as well as efficient processing.The atomizing jet is one of important cooling methods.By compressing the air, the mixed compressed air and cutting fluid are intermittently sprayed on and formatted atomization.The small droplets emitted by the atomized jet have better permeability when comparing with those by overflow cooling of cutting fluid.The cooling medium can be applied to the tool rake face and the chip inner surface more accurately by the atomized jet.In order to explore the influence of atomized jet on chip breakability of 42CrMo steel, three cooling methods including dry cutting, cutting fluid overflow, and atomized jet are applied in this study.The two feed rates including 0.15mm/r and 0.18mm/r are used in turning experiments.The chip length, chip curl radius, cutting force and tool-chip contact length are measured.Under the same feed rate by using atomized jet, both the chip length and tool-chip contact length are shorter.The chip curl radius and the cutting force is smaller.The roughness of the chip inner surface is smaller.更多还原