Cutting Performance And Cutting Parameter Optimization Of Nickel-based Super Alloy

Nickel-based alloy is one of the most difficult-to-machine materials because of hard particle, work hardening, low thermal conductivity. How to improve the machinability of nickel-based alloy is a very urgent problem in aircraft, spacecraft and other manufacturing industries. Through researched on the experimental for high-speed turning of Nickel-based alloy GH4133B,and mathematical optimization model,it obtained reasonable cutting parameters.There are lack of machining Parameters in the machining of difficult-to-machine materials, fuzzy comprehensive evaluation method was applied to estimate the machinability of GH4133B, then the easy degree of material machining operations was known, and rationalization of cutting parameters was realized.Cutting force is a basis to study the cutting mechanism, to calculate power consumption, to design machine tools, cutting tools and fixture, to select a reasonable cutting parameters, and to optimize the tool geometric parameters; Surface roughness was the most important parameters, which to evaluate the surface quality in cutting operation; GH4133B is a typical difficult-to-machine materials which always brings about inefficient cutting and serious tool wear. So, improvement of GH4133B of processing efficiency and tool life is in urgent need to solute. And study of cutting force, surface roughness and tool wear has a very important practical significance.Carbide cutting tools CNMG120408-23 1005 were used for cutting GH4133B.According to the experimental results, the influences of cutting parameters on the cutting force and surface roughness are analyzed and rational cutting parameters were got. Furthermore, models based on empirical formula and models based on the MATLAB neural network for prediction cutting force and surface roughness were established. When the processing object was made clear to develop the processing program, engineering and technical personnel who are provided with the cutting force and surface roughness can control the impact of cutting force and the quality of the manufacturing process and can reduce the reject rate and processing costs. Based on the experiments of high speed turning of nickel-based super alloy with CC670 Ceramic cutters. The relationship between cutting speed,feed rate,depth of cutting and cutting tool life has been established ,the empirical formula of cutting tool life was also obtained. The optimum cutting elements and the main wear and fracture forms occurred during the cutting process were presented. Several conclusions can be drawn from researches: Wear mechanism are mainly notch wear,rear face wear,rake face wean micro-fracture and chipping of cutting edge, and the rake face wear frequently links up with rear face wear, which always creates the cutting edge damage.On the basis of experiment and consideration of the actual production situation, parameter Optimization model with the maximum productivity and the minimum cost being the objective function was established. Matlab optimization toolbox was used to obtain the reasonable cutting parameters.