Experimental Research On Dry Turning Of TC4 With （W,Mo）C-Al₂O₃ Unbonded Phase Tool

Titanium alloy materials have good specific strength and excellent corrosion resistance,and are widely used in medical,aerospace,and weapons industries.However,the cutting temperature of titanium alloy is high,the cutting force is large,the sticking phenomenon is serious,and the tool wears quickly.The titanium alloy processing has high requirements on the mechanical properties of the tool,and the processing efficiency is low and the cost is high,which affects the excellent performance of the titanium alloy.YG type carbide tools are commonly used in titanium alloy cutting.However,when the YG-based cemented carbide tool is used to cut titanium alloy,the excessive cutting temperature tends to cause softening of the binder phase Co,precipitation of WC particles,diffusion and bonding between the workpiece material and the tool material,and the wear of the tool is aggravated,deteriorate the surface quality of the workpiece.In this paper,the cutting performance and wear mechanism of the new（W,Mo）C-Al₂O₃ unbinded phase cemented carbide tool for titanium alloy machining researched by the research group are studied experimentally,which provides a basis for the application of the new unbonded phase cemented carbide.At the same time,in order to further improve the dry cutting performance of the new unbonded phase tool for titanium alloy,the rake face micro-texture was introduced,and the cutting performance and wear mechanism of（W,Mo）C-Al₂O₃ unbonded phase hard state tools under micro-textured state on titanium alloys was explored.The main research work of this paper is as follows:1)The dry cutting performance of TC4 with non-microtextured（W,Mo）C-Al₂O₃unbinded phase carbide tool was studied.Under the same tool shape and geometric parameters,change the amount of back-feeding,cutting speed and feed,and perform the experiment of dry-turning TC4 titanium alloy on the new unbonded phase cemented carbide tool without micro-texture and YG8 tool.Analyze and compare the cutting force during cutting and the surface roughness of the workpiece after cutting.The experimental results show that under the same cutting parameters,the non-microtextured（W,Mo）C-Al₂O₃binderless phase carbide tool cutting TC4 has less cutting force and lower roughness value.2)The cutting performance of the（W,Mo）C-Al₂O₃ unbinded phase cemented carbide tool with grooved micro-texture on the flank of the titanium alloy TC4 was studied.Under the same tool shape parameters and cutting parameters,change the micro-texture parameters,dry-cut TC4 test,compare the cutting force and the machined surface roughness value of the new unbonded phase carbide tool and YG8 tool cutting TC4 The influence of different micro-texture parameters on the cutting performance of the two tools is obtained.Experiments show that the micro-texture of suitable parameters has a significant improvement on the cutting performance of（W,Mo）C-Al₂O₃ unbinded phase cemented carbide tools,and the YG8tool with micro-texture is prone to tool failure.3)The flank wear curve and tool wear mechanism of the new（W,Mo）C-Al₂O₃ unbinded phase carbide tool for dry cutting TC4 titanium alloy were studied.The comparison with the YG8 tool shows that the wear resistance of the non-micro-woven（W,Mo）C-Al₂O₃non-bonded phase tool is better than that of the non-microtextured YG8 tool;The micro-texture can effectively improve the wear resistance of the（W,Mo）C-Al₂O₃ unbonded phase cutter,accommodate the adhesive layer,and slow the adhesion.