Tool Wear In Titanium Alloy Turning Under Nanofluids Minimum Quantity Lubracation

Titanium alloys have a series of excellent physical and mechanical properties such as low density,high specific strength,good thermal strength,and good corrosion resistance,and are widely used in various fields of industry.However,titanium alloys also have the disadvantages of large chemical activity,poor thermal conductivity,and low modulus of elasticity.During the processing,the tip temperature is high,and the sticking knife phenomenon is serious,which greatly limits the wider application of titanium alloys.In view of this phenomenon,polycrystalline diamond(PCD)tools with good wear-resistance are selected in this paper,and nanofluids with high thermal conductivity and good lubricity are used as the cutting fluid,and the liquid supply mode is the minimum quantity lubrication(MQL).It is of great significance to improve the workpiece surface quality of titanium alloy workpiece and expand the application range of titanium alloy to carry out the research on the tool wear of titanium alloy precision turning under nanofluid minimum quantity lubrication.The surface tension and viscosity of nanofluids are the main parameters affecting their atomization performance.The friction coefficient between the solid-liquid surface contact angle and nanofluid lubrication of the PCD tool-titanium alloy friction pair is the main parameter affecting the lubrication performance of nanofluids.The atomization and lubrication properties of nanofluids are the basis for the study of tool wear under trace lubrication.In this paper,the relationship between the above parameters and the volume fraction of carbon nanotubes was experimentally tested.The test results show that the addition of carbon nanotubes can improve the atomization and lubrication performance of the base fluid.Based on the experimental results of plane friction of nanofluid-lubricated PCD tool-titanium alloy,the lubrication mechanism of nanofluids was analyzed.The above results provide the basis for exploring the effects of nanofluid properties on tool wear.Different trace amounts of MQL have an important influence on the cooling and lubricating properties of nanofluids.In this paper,the maximum temperature of the tool tip is determined by Abaqus simulation.On this basis,using Fluent simulation software,the distribution of trace lubrication flow field and tool temperature under different trace amounts of lubrication parameters was studied.The nanofluid cooling performance is mainly affected by the jet pressure and the distance of liquid supply,and the nanofluid flow has less influence on it.The above results provide guidance for investigating the effects of nanofluids' slight lubrication parameters on tool wear.Diamond tool wear is the main reason limiting the precision and ultra-precision machining applications of titanium alloys.In this paper,through the precision cutting experiments of titanium alloys,it was found that the main wear mechanisms of the rake face of PCD tools are bond wear,groove wear,diffusion wear,and chipping.flank wear mechanism is the adhesive wear.The experimental results show that compared with dry cutting and pure liquid minimum quantity lubrication,nanofluids minimum quantity lubrication can significantly reduce the amount of flank wear.The effects of the volume fraction of carbon nanotubes on the wear of the flank were analyzed.The jet pressure,the distance of liquid supply,and the tool angle had a certain influence on the tool wear.