Surface Quality Prediction And Process Parameters Optimization Of Marine Diesel Engine Body Boring With Curved Axle Hole

Marine diesel engine body belongs to large complex body parts,is the foundation of every parts and components in the assembly in Marine diesel engine,and the fuselage of the shaft hole machining surface quality will decide whether or not a crankshaft has a good power output of the environment,and directly affect the use of the diesel engine performance and service life,so for the fuselage of the shaft hole processing requirements are often higher.At present,the boring parameters of the curved shaft hole of the fuselage are mainly selected according to the process manual and processing experience,which is difficult to ensure the machining accuracy and improve the machining quality.This thesis focuses on the fuselage surface quality of the curved shaft hole boring problems are studied,by adopting the combination of finite element simulation technology and experiment method,discusses the boring parameters on the influence law of surface residual stress and surface roughness,and using intelligent optimization algorithm combination of cutting parameter optimization,main research contents are the following:(1)The metal cutting finite element simulation software was used to establish a simulation model for boring the curved shaft hole of the fuselage,and the reliability of the simulation model was verified by comparing the simulated chips with the actual chips and the simulated residual stresses with the actual residual stresses.At the same time,two kinds of cutting tools with chip removal grooves were designed according to the metal cutting theory,and the influence rules of different cutting parameters on cutting force and cutting temperature were analyzed.(2)Firstly,the prediction model of surface residual stress was established by response surface analysis method,and the validity of the prediction model was verified by analysis of variance.Finally,the influence of cutting parameters on surface residual stress and the depth of residual stress layer was analyzed by response surface contour map and single factor analysis method.(3)Based on ABAQUS software,the simulation model of body boring surface roughness was established,and the influence law of single factor and double factor coupling of cutting parameters on surface roughness was analyzed.Finally,NSGA-? multi-objective optimization algorithm was used to optimize the boring parameters of the fuselage,taking the maximum material removal rate,the minimum surface residual stress and the minimum surface roughness as optimization objectives.