Influence of Cobalt Phase Distribution Uniformity in Ultrafine Cemented Carbides on Performance of PCB Milling Cutters
Three types of ultrafine cemented carbide rods with different cobalt phase uniformity and a cobalt mass fraction of 6%were made into PCB milling cutters.The physical and mechanical properties,microstructure,and milling cutter performance of the three types of ultrafine cemented carbide rods and PCB milling cutter samples were compared.The cobalt phase distribution uniformity of the cemented carbide rods was quantitatively analyzed using ICALIBUR cobalt phase analysis software,and the influence of cobalt phase distribution uniformity on the performance of PCB milling cutters was studied.The results indicate that the uniformity of cobalt phase distribution is not reflected in the physical and mechanical properties and can only be detected through direct cobalt phase distribution detection methods.The detection of cobalt phase analysis software shows that the mass fraction of the cobalt phase is in the range of 5%～7%.Sample A is 50%;sample B is 66%,and sample C is 80%.After the PCB milling cutter is made,the life of sample A and sample B with poor cobalt phase uniformity is more than 20%lower than that of sample C with better cobalt phase uniformity.Poor cobalt phase distribution uniformity can cause uneven hardness in the local area of the cutting edge of milling cutters made of cemented carbide rods,resulting in uneven wear and chipping during use,leading to reduced service life.
cemented carbide rodcobalt phase distribution uniformitycobalt phase analysis softwaremilling cuttermicrostructure
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