高速切削硬态AISIH13的PCBN刀具磨损机制研究

Study of PCBN Tool Wear Mechanism When High Speed Cutting Hardened AISIH13 Steel

采用超硬刀具精加工模具工作零件的"以切代磨"机加工艺能够显著提高模具使用寿命。但目前对此研究还甚少。以超硬刀具PCBN高速切削硬态AISIH13 (HRC53),并用测温仪、光学仪、工具显微镜(XGJ-1)及JSM-5600LV型扫描电镜等对刀具磨损进行观察、检测与分析。结果表明:前后刀面主要以黏结磨损为主,但前刀面磨损主因是切削热,而后刀面磨损主因是机械应力,且在主切削刃上常发生沟槽磨损,若不平衡切削时亦会产生不规则破损。

The service life of dies can been improved significantly by the machining process of " cutting in place of grinding" which the mold working part be highly processed with super hard cutters. But there are few studies on it. The tool wear was observed, detected and analyzed by thermometer, optical instrument, tool microscope ( XGJ-1) and SEM ( JSM-5600LV) when high speed machining hardened AISIH13 ( HRC53) with super hard cutting tool PCBN. The result shows it is mainly adhesive wear in the rake face and flank surface, but the cutting heat is primary cause of rake wear, while the mechanical stress is dominating reason, and groove wear often lies on the cutting edge of the main cutting edge, also irregular breakage can been generated when the cutting is not bal-anced.