聚晶金刚石刀具低温冷却铣削Cf/SiC磨损机理

采用聚晶金刚石(PCD)刀具对C_f/SiC陶瓷基复合材料进行干式和低温冷却铣削试验,获得了PCD刀具在干式和低温冷却铣削条件下的前刀面和后刀面磨损形貌,测得了不同铣削长度所对应的主切削力和后刀面磨损量,分析了PCD刀具在不同铣削条件下的磨损机理及寿命可靠性。研究表明:在低温冷却条件下,PCD刀具以磨粒磨损为主要磨损机理,失效表面存在明显沟槽磨损和大量长条状划痕;而在干式铣削条件下,PCD刀具以磨粒磨损和局部氧化磨损为主要磨损机理,失效表面呈现均匀的磨损带;低温冷却使PCD刀具有效使用寿命提高约100%。

Research on PCD tools wear mechanisms when cryogenic cooling milling Cf/SiC composite

In this paper, C_f/SiC composite was machined by PCD tools under both the dry and cryogenic cooling conditions, obtaining wear morphology of the rake and flank surfaces. The relationship curves of the major cutting force and wear width of the flank surface versus cutting length were conducted, and wear mechanisms and life stability of PCD tools were also studied. The results showed that the major wear mechanism of PCD tools was abrasive wear under the cryogenic cooling condition, while the major wear mechanisms of PCD tools were abrasive wear and oxidation wear at the dry condition. The tool usage life under the cryogenic cooling condition was approximately added up to 100% than that of at the dry condition.