The effect of milling parameters on surface integrity in high-speed milling of ultrahigh strength steel

Abstract Ultrahigh strength steel with high specific strength, high thermal strength, good corrosion resistance and other characteristics are widely used in aerospace field. However, these characteristics coupled with its poor thermal conductivity, making it hard to machine, and causes high cutting temperature, serious tool wear can adversely affect the machined surface integrity, ultimately affecting the fatigue performance of the machined part. Therefore, the research on the machined surface integrity of ultrahigh strength steel has very important theoretical significance and engineering application value. The effect of milling parameters on surface integrity in high speed milling of 16Co14Ni10Cr2Mo ultrahigh strength steel is studied. The results show that the influence of milling speed and feed per tooth on two-dimensional and three-dimensional surface roughness is significant, but the milling depth has little effect. Surface roughness increases with milling speed and feed per tooth. The surface residual stresses are in the state of tensile stress, and the surface residual stresses increase with the milling speed, the feed per tooth and the milling depth. The influence of feed per tooth on residual stresses is the most significant. Surface microhardness decreases with milling speed and feed per tooth, but increases with milling depth.