Study on Wear Mechanism of Coated Tool Milling High-strength Nitrogen-type Gray Cast Iron HT350
In order to investigate the milling performance of high-strength nitrogen-type gray cast iron,PVD coated carbide tool and CVD coated carbide tool are selected for milling test of high-strength nitrogen-type gray cast iron,the wear morphology of the two tools is comparatively studied,the effect of cutting three factors on the wear bandwidth is investigated by analysis of variance,and the distribution of elements are observed in the wear zone.The results show that the wear of the front face of the PVD-coated tool is more severe than that of the CVD-coated tool at the same milling dosage,and the milling speed Vc has the greatest influence on the wear bandwidth of the tool,followed by the back draft ap and the least by the feed fz.At low cutting speeds(Vc=100～200m/min),the tool wear is dominated by abrasive and bond wear,at high cutting speeds(Vc=200～250m/min),tool wear is dominated by diffuse wear and oxidation wear.The PVD coated TiAlN is oxi-dized to generate Al2O3,while Al2O3 keeps flaking off during the machining process,resulting in more serious wear of PVD coated tools.
万方数据
维普
