PCD和SCD刀具车削各向同性热解石墨时的性能对比

Comparative on the Process-Ability of PCD Tool and SCD Tool During Cutting of Isotropic Pyrolytic Graphite

采用聚晶金刚石(PCD)刀具和单晶金刚石(SCD)刀具进行了各向同性热解石墨切削加工试验,对刀具磨损过程、磨损机理和表面加工质量进行了对比研究。通过对试验结果的研究分析表明:两种刀具的磨损主要发生在后刀面,且切削刃都出现了微崩刃。PCD刀具后刀面上形成了平行沟槽和严重磨损两种磨损形貌,SCD刀具后刀面上形成了平行沟槽和微细网状两种磨损形貌。PCD刀具的磨损机理主要磨粒磨损,SCD刀具的磨损机理则主要是解理磨损和磨粒磨损,切削过程中持续波动的切削力是造成两种刀具微崩刃的主要原因。虽然两种刀具的加工表面都存在不同程度的凹坑,但与PCD刀具相比,SCD刀具具有较好且稳定的加工性能。

Turning of isotropic pyrolytic graphite tests was conducted with polycrystalline diamond （PCD）tools and single crystal diamond （SCD ）tool,the wear process of tool,wear mechanism of tool and the effect of tool wear on surface machining quality were studied comparatively. Based on the experimental results and analysis ,the wear of two kinds of cutting tool mainly occurred in the flank face,and cutting edge emerged micro-chipping. The wear area of PCD tool can be divided into two kinds of morphology： parallel grooves and severe wear,the wear area of SCD tool also can be divided into two kinds of morphology： parallel grooves and micro-reticular. The main wear mechanism of PCD tool was abrasive wear,the wear mechanism of SCD tool was mainly cleavage wear and abrasive wear,and the micro-chipping of tool was caused by continued volatility cutting force during cutting process. Although there were different degrees of pits on both machined surface of the two cutting tools, but SCD tool has good and stable processing performance compared with PCD tool.