The Comparison between CBN and tungsten carbide
Comparing with tungsten carbide,CBN cutting tools with much little wear in turning powder high-temperature alloys, so make the machining precision available to be achieved .Taking tungsten carbide grade YT726 to turn FGH95 powder high-temperature alloy with cutting speed as V=15m/min,cutting depth as ap=0.2mm ,feeding as f=0.1mm/r,its cutting distance is only 3.6mm ,but its flank wear is VB=0.15mm , radial wear is 0.016mm ,reflected the change on the workpiece diameter is dd=0.032mm.On the contrary,if take CBN cutting tools to turn powder high-temperature alloys, set its cutting parameter as following :V=70m/min,ap=0.2mm,f=0.1mm/r),after turned 3.6m ,the wear on its flank face is even could not be measured, the max estimated value is VB=0.004mm.At this time,the wear on its flank face is reflected on the workpiece diameter change as dd=0.0008mm,that means the variation of workpiece diameter in short-time turning less than 1um.
