| With the rapid development of modern science and technology,titanium alloy material,as an important metal structure material,has the advantages of low density,high specific strength,low temperature performance,corrosion resistance and so on.It is used in the field of Aeronautics and Astronautics,especially for aero engines,turbine discs,etc..Also used as a common tubular material in the petrochemical industry,marine areas,the main production equipment has condensers,submersibles and so on.The quality of these parts directly affects the running performance and life of the whole mechanical device.So we have to improve the surface quality of these parts.However,because of its good physical and chemical properties,titanium alloy has become a typical difficult machining material in the industry,so it is difficult to meet the processing needs by traditional machining methods.The use of magnetic abrasive finishing this non precision the traditional processing method of titanium alloy processing,although due to magnetic abrasive with self sharpening and flexible and other advantages of good,you can make up for lack of processing method,but its cutting performance is poor,the processing efficiency is low,can not meet the industrial requirements.This paper presents a method for electrolytic magnetic abrasive machining,electrolytic magnetic abrasive machining using electrolytic dissolution will exist on the surface of titanium alloy burrs,sharp points and softening of passivating film,a processing method using magnetic abrasive mechanical removal of passivation film softening removal,the method is two the method effectively combined and maintain various machining advantages.In this paper based on the theoretical basis of ECM and magnetic processing on the principle of electrolytic magnetic composite processing was discussed,and the magnetic abrasive machining was found between independent and mutual influence.The electrolytic magnetic composite machining device is designed for the titanium alloy plane and the pipe fittings respectively.For the electrolysis are analyzed.The optimized passivation film formed by the compactness and uniformity of the type and concentration of electrolyte.The titanium alloy plane and fittings are studied through the design of the device were selected,electrolysis voltage,magnetic abrasive particle size and spindle speed as the main influence factors of single factor analysis test,study the influence of various factors on the processing effect and optimum parameters.The surface roughness,surface morphology,surface residual stress and surface energy spectrum were observed and analyzed before and after machining.The testing results show that the electrolytic magnetic abrasive machining titanium alloy in the optimized parameters,the lowest surface roughness,surface morphology and surface uniform,composite after processing is a good way to maintain the surface properties of materials;composite processing can make the surface of the tensile stress into compressive stress state,so as to obtain better surface stress state;verify the feasibility and effectiveness of the combined machining.According to theprocessing parameters in the test,the selection and optimization of experimental conditions for the processing of the response surface method,using Box-Behnken method based on experimental design,selection of power supply voltage,spindle speed and feed speed as experiment factors,tested three factors and three levels,established three factors corresponding to the response value(surface roughness)the regression equation,and the results of variance analysis,studies the interaction between the two factors,finally the optimal experimental conditions after that. |
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