Research On Laser Cladding Remanufacturing Process And Fatigue Characteristics Of Screw Rotor Shaft

In recent years,a large number of electromechanical products in various industries in my country are facing technical or economic elimination,which does not meet the resource-saving and environmentally friendly green cycle development concept.It is imperative to remanufacture waste and damaged product parts.Remanufacturing technology can restore damaged parts to their original size and performance,which can extend the service life of the product,discover the value contained in the failed product,reduce resource loss and protect the environment.Therefore,the development of remanufacturing technology is an effective way to build a circular economy and implement environmental protection.This article is in the National Natural Science Foundation of China "Additive Remanufacturing Mechanical Parts Service Life Prediction Methods and Experimental Research"(Project Number: 51505268)and Graduate Innovation Fund "Laser Cladding Connection Fatigue Performance Research"(Project Number: SLGYCX1827)Under the support of other projects,combined with the previous research theories and methods,the basic issues of the laser rotor cladding remanufacturing process and fatigue characteristics of the screw rotor shaft were studied.The laser cladding remanufacturing process of rotor shaft materials belongs to the basic research of remanufacturing.At the same time,the research on the mechanical properties and fatigue characteristics of rotor shaft materials and the fatigue life prediction of remanufactured rotor shafts have practical application background and have typical demonstration significance.Firstly,based on the influencing factors of the laser cladding remanufacturing process,establish a multi-objective optimization model based on the uniform design method;analyze the influencing factors of the laser cladding remanufacturing macro-morphology and internal quality,and establish a multi-objective optimization under the comprehensive goal Regression analysis model to obtain the optimal combination of process parameters for single-pass cladding,comprehensively considering the process path and lap rate in multi-pass laser cladding,to determine the final optimized process for multi-pass cladding,and to prepare laser cladding that meets the requirements Remanufacture the test piece.Then,the mechanical and fatigue properties of the cladding structure were analyzed,and the influence laws of the cladding layer mechanics and fatigue analysis were obtained.On the basis of this research,according to the fatigue life theory and the test result data,the stress-life curves of the smooth specimen,the V-notch and the semi-circular notch specimen were fitted respectively,and the residual stress of the shaft surface was repaired by laser cladding The measurement is performed to obtain the residual stress distribution law of the cladding axis surface.Finally,based on the fatigue characteristic curve of the rotor shaft material and the static load distribution after laser cladding on the damaged shaft surface,the fatigue life prediction of the remanufactured rotor shaft is carried out.Analyze the operating condition characteristics and characteristic loads of remanufactured rotor shafts,process the loads and establish typical operating stage characteristic curves,use Fe-safe software to predict the fatigue life of remanufactured rotors,and analyze the impact of loads on the fatigue life of remanufactured rotor shafts Happening.