Research On Grinding Surface Integrity Of Nickel-based Single Crystal

Compared with iron-based and cobalt-based alloys, nickel-based single crystal alloys endure higher temperature, oxidation and erosion. They are main materials for manufacturing advanced aircraft engine’and gas turbine’blades currently. That nickel-based single crystal alloys have carbide, nitride, oxidizing materials and metal-base compounds, have lower thermal conductivity and endure higher temperature induces that they may hard to machine.Surface integrity is a comprehensive evaluation of the machined surface. The evaluation indicators are surface roughness, residual stress recrystallization, and so on. Surface integrity has an important impact on fatigue properties and safety of the parts.Grinding is often used as the final machining step. It is a precise machining method to obtain high precision and surface quality. CBN grinding wheel has many advantages, such as high wear resistance and temperature resistance, good thermal stability and thermal conductivity. Combination of grinding and CBN wheel has an important significance to do research on surface integrity of nickel-based single crystal alloys.Using CBN wheel to grind nickel-based single crystal alloy DD402, the work of three aspects is done.(1)By changing the grinding parameters, the experiment of grinding nickel-based single crystal alloy is done, and the law of grinding depth and work-piece speed to grinding temperature is studied.(2)The law of grinding depth and work-piece speed to surface integrity is studied.(3)Using CBN wheel speed, grinding depth and work-piece speed as inputs, grinding surface roughness as outputs, I employ BP neural network to simulate grinding surface roughness. The results show that BP neural network can more accurately predict the grinding surface roughness of nickel-base single crystal alloy DD402.