Effect of Milling Process Parameters on Surface Integrity of GH4169D High-Temperature Alloy
GH4169D has been widely used in the manufacturing of aero engine blades,and the surface integrity after milling significantly affects the working performance of the blades.The milling experiment of GH4169D high-temperature alloy was carried out to study the influence of different process parameters on the surface integrity after milling.The results show that with the increase in milling speed,the surface roughness of GH4169D high-temperature alloy during milling along width cutting direction first increases and then decreases.The roughness along the width cutting direction increases with the increase in cutting width.Milling speed and cutting depth have a greater impact on microhardness.A large milling speed indicates a weak hardening phenomenon;a larger cutting depth indicates an obvious hardening phenomenon.The residual stress on the surface of GH4169D after milling is tensile stress,and a larger cutting speed indicates a larger residual tensile stress.The same relationship is shared between the residual tensile stress and the feed per tooth.When the milling speed becomes larger,the depth of the surface residual stress gradually becomes larger,and the peak of the residual compressive stress becomes smaller.As the milling width becomes larger,the depth of the maximum residual compressive stress does not change significantly,but the peak changes significantly.ap is within 0.16-0.24 mm,and the surface residual stress changes significantly.The depth of the maximum residual compressive stress increases,and the peak value decreases.The plastically deformed layer becomes thinner with increasing milling speed and thicker with increasing cutting depth.
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