Study On The Medical Stainless Steel Turning With Different Coating Tools

316L stainless steel material belongs to ultra-low carbon austenitic stainless steel.It has been widely used in the medical industry because it has good corrosion resistance,biocompatibility,etc.,but its processing performance is poor.Coated tools are widely used for machining difficult-to-machine materials due to their excellent properties.The current researchers only use mature machining stainless steel tools of the market to do cutting studies in a sigle cooling method.But in this paper,the processing performance of homemade coated tools（M1-TiAlSiN coating,M3-Multi3-TiAlSiN coating）are used to compare to mature machining stainless steel tools of the market（ATN-Techmart AiTiN,KC5025-Kennametal AiTiN,KCU10-Kennametal TiAiSiN）and the effect of cutting parameters,tool coating and five cooling methods（Dry、MQL、OoW、CO₂、L-N₂）are studied systematically which have a certain guiding role of Tool selection,cutting parameter selection,and cooling method selection for stainless steel machining.（1）The wear tests of five coated tools are conducted in five cooling methods.It is found that the flank wear of M1 is close to the Purchased tools in the Dry\MQL cooling methods,the tool-KCU10 is optimal in the OoW\L-N₂cooling methodS,the tool-KC5025 is optimal in the CO₂ cooling method.But the effects of L-N₂ are the worst.The cooling methods which are suitable for tool KC5025、KCU10 have much consistency and The cooling methods which are suitable for tool M1、ATN have much consistency.（2）The corresponding cutting parameters of various coated tools under different cooling methodes are studied when the cutting force or workpiece surface roughness is optimized.It is found that the cutting force increases with the increasing of feed and depth of cut,the roughness increases with the increasing of feed,and the effect of depth of cut on roughness is complicated.but the critical cutting speed of the corresponding tool is also different when the cutting force or workpiece surface roughness is optimal in different cooling methods.（3）The cutting force of different coated tools and the surface roughness in the same cooling method and The cutting force of the same coated tool and the surface roughness in the different cooling methods are studied.It is found that the cooling methods and the coated tools have a certain degree of influence on the surface roughness of workpieces and the cutting force.And there is an optimal match between coated cutters and different cutting parameters in the same cooling method,meanwhile,different cutting parameters also have an optimal match with different cooling methods when the same tool is used.（4）Orthogonal tests are conducted to explore the effects of cooling methods,cutting tools,cutting speed,feed rate,and depth of cut on the cutting force and surface roughness of workpieces.The primary and secondary factors affecting the total cutting force are found:feed speed（f）>the depth of cut（ap）>cutting speed（V_C）>cooling methods>Tool.The primary and secondary factors that affect the roughness are found:feed speed（f）>Tool>cutting speed（V_C）>the depth of cut（ap）>cooling methods.