Control Of Cutting Deformation And Optimization Of Processing Parameters Of Chrome-copper Alloy Thin-walled Parts

The petroleum industry is the pillar industry of the national economy.Petroleum machinery is complex and diverse,with pipe parts and thin-walled parts mostly.Because of its high strength and hardness,and good thermal conductivity,chrome-copper alloy is used to process the inner shell of a petroleum machinery cooling device.Chrome-copper alloy thin-walled parts have many difficulties such as machining deformation during processing.It is very important for the actual production to analyze the causes of processing deformation and control the amount of deformation.This paper analyzes each key technology of the milling process,establishes a three-dimensional thermal coupling milling model of chrome-copper alloy thin-walled parts,summarizes the changing law of the milling force,and predicts the amount of deformation of the part during the process through the static simulation model.After experimental verification,the average error of radial deformation of the simulation model is 11.1%,and the average error of tangential deformation is 12.8%.Then the milling force plug-in program is established,and the simulation data between the milling parameters and the maximum deformation is obtained by combining the static simulation model.Using the BP neural network algorithm to fit the functional relationship between the milling parameters and the amount of deformation,and then using genetic algorithm to optimize the milling parameters with the minimum deformation and maximum machining efficiency as the objective function.The optimized milling parameters are spindle speed n = 1550r/min,back-feeding amount α_p=0.36mm,side-feeding amount α_c=0.23mm,and feed amount is 1.6mm/s.Compared with theempirical parameters,it can be seen that the radial deformation and tangential deformation of the parts are obviously reduced when the optimized milling parameters are used,and the processing efficiency is increased by 29.7%.This shows that the machining model and optimization algorithm established in this paper have practical guiding significance for the processing of thin-walled parts,and provide an effective method for the processing of the same kind of parts.