Research On Polishing Passivation And Cutting Performance Of Cemented Carbide Insert

With the continuous progress of modern manufacturing industry and the rapid growth of market demand,The CNC tool industry ushered in a stage of rapid development.Correspondingly,higher requirements are placed on the quality of insert.At present,the cutting performance of cemented carbide tools is mainly improved by refining the particle size of the base material,cutting edge passivation and coating.Studies have shown that after the cutting edge is passivated,the surface/subsurface damage of the tool is significantly reduced,and the cutting performance,reliability and surface quality of the tool after processing are significantly improved.Austenitic stainless steel materials have good corrosion resistance,plasticity and toughness,and are widely used in high-end technical fields such as aerospace,medical equipment,and ships.At present,the processing tools for cutting austenitic stainless steel mainly include cemented carbide insert,ceramic insert,cubic boron nitride insert,etc.。 Among them,cemented carbide insert are the mainstream tools for processing austenitic stainless steel due to a series of advantages such as high hardness,high wear resistance and low cost.Chemical Mechanical Polishing(CMP)is one of the ultra-precision processing technologies,able to obtain a smooth,damage-free surface.Based on the experimental platform of cemented carbide chemical mechanical polishing edge passivation,This article Carry out passivation experiments on grinding uncoated YG8 insert through chemical mechanical polishing technology to explore the influence of CMP processing parameters on the blunt radius of the cutting edge of the insert.Using YG8 inserts before and after cutting edge passivation to carry out cutting experiments on 06Cr19Ni10 austenitic stainless steel,to explore the influence of blunt circle radius and process parameters on the cutting performance of the tool,and to provide theoretical guidance for CMP passivation.The specific research work of this paper is as follows:1)Construction of experimental platform and preparation of passivation blades.First,based on the intelligent nano-level Nanopoli-100 polishing machine,built an experimental platform for the CMP passivation auxiliary device.Through orthogonal experiments on the experimental platform of the CMP passivation auxiliary device,the optimized ratio of the passivation process parameters(polishing speed,passivation time,abrasive particle concentration,abrasive particle size)is obtained.The optimal combination of process parameters is: polishing speed 50r/min,passivation time 40 min,abrasive concentration12wt%,abrasive particle size 2.5μm.Experiments have verified that the surface quality of the insert CMP passivation at this ratio is better.2)The cutting force experiment of turning 06Cr19Ni10 austenitic stainless steelworkpieces with two inserts before and after CMP passivation is used to compare and analyze the different cutting process parameters(feed rate,depth of cut,cutting speed)during the processing of the two inserts The influence law of cutting force is used to construct an empirical prediction model of cutting force.3)The experiment explored the influence of CMP passivation technology on surface quality.Two kinds of inserts before and after CMP passivation were used to turn 06Cr19Ni10 austenitic stainless steel workpieces,and the influence of CMP passivation technology on surface processing quality was studied.The effect of YG8 inserts before/after CMP passivation on the surface roughness and surface work hardening under different cutting process parameters(feed rate,depth of cut,cutting speed)was studied,and an empirical prediction model of workpiece surface roughness was constructed.