Study On Milling Force And Surface Formation Effect Of Nuclear Grade Stainless Steel Milling

Nuclear grade stainless steel is the main material of nuclear power equipment.It is widely used in nuclear power cladding materials,pipelines,valves,partitions,etc.due to good nuclear energy,mechanical properties,chemical properties,physical properties,irradiation performance,process performance and economic performance.Large structural parts.The service environment of key nuclear power components is extremely harsh,and it is usually under complicated conditions such as high temperature,high pressure,strong corrosion,and strong irradiation,and the surface quality of key components of nuclear power is required to ensure high quality,high safety,and long service life.Nuclear grade stainless steel in the high-speed cutting process due to high cutting temperature,surface hardening,uneven distribution of residual stress and other phenomena lead to parts in the complex service environment,surface cracking,creep expansion,corrosion resistance and other issues.Therefore,research on the influence of cutting parameters on the milling force and surface creation of nuclear grade stainless steel high-speed milling processing is very important for improving the service performance,the use performance index,and the surface quality of the nuclear grade stainless steel parts.Based on the theory of high-speed cutting,the TiAlN and TiAlSiN coating end mills were used to perform orthogonal c-milling orthogonal experiments on nuclear grade stainless steels,and the finished surface roughness,microstructure,microhardness,and surface of the nuclear grade stainless steels were studied.Systematic studies of textured and residual stresses have revealed a mechanism for the creation of nuclear grade stainless steel surfaces.The conclusions are as follows:(1)According to the Taguchi method for designing high-speed milling orthogonal experiments,the effect of two different coatings TiAlN and TiAlSiN on milling force was analyzed and compared.After analysis of mathematical methods such as range error,variance,regression,etc.,the surface integrity indication index was established regarding the multiplicity of milling parameters.Linear regression prediction model.(2)From the mechanism analysis of the relationship between milling parameters and roughness,surface microstructure,work hardening,surface processing texture and residual stress,revealed the surface creation mechanism.(3)The main influencing factors of milling parameters on roughness,work hardening and residual stress were discussed.The best parameter combinations corresponding to various surface integrity characterization indicators were obtained,and the most common use of two coated cutters to mill nuclear grade stainless steel was summarized.The best processing parameters range provides a rational reference for high-speed milling of nuclear grade stainless steel.(4)The differences in the surface roughness of the feed and retract position under the same machining parameters were studied.The hardening of the machining crosssection was analyzed.The high-speed milling of the stainless steel parts was specifically designed and manufactured to verify the high speed.The effectiveness of milling processing on surface integrity.