Magnetic Grinding And Finishing Of The Inner Surface Of Slender Pipe And Establishment Of The Prediction Model Of Surface Roughness

In recent years,the equipment manufacturing industry has developed rapidly.Titanium alloy,as an important metal structure material,has been widely used in aerospace,petrochemical,Marine and other fields.Among them,long and thin tubes made of titanium alloy are often used in aero-engines,condensers,deep-diving equipment.The surface quality of long and thin tube directly affects the operation performance and service life of the whole mechanical device.Therefore,it is necessary to find a suitable method to improve the smoothness of the inner surface of the slender tube and enhance its transport performance.Magnetic Abrasive Finishing machining technology(Magnetic Abrasive Finishing)is the use of the characteristics of the Magnetic field to assist in a kind of polishing technology,can effectively improve the quality of the surface of the workpiece,compared with the traditional method has high adaptability,the sharpness of strong,small temperature compensation,etc,and the need for tools at this stage has better applied to the complicated curved surface,plane,internal and external round surface.Compared with the traditional magnetic grinding method,this paper adopts the method of adding ordinary radial magnetization auxiliary magnetic pole inside the tube cavity,which can increase the magnetic induction intensity in the processing area,improve the grinding pressure of magnetic particle brush on the inner surface of the tube and improve the grinding efficiency.However,at the present stage,the selection and determination of parameters in the magnetic lapping finishing process of parts are more dependent on experience and a large number of basic experiments,and there is a lack of relevant research on predicting the surface roughness value after the test.The selection of different processing parameters lacks necessary research on the final evaluation index.In view of the above problems,this paper firstly studied the influence of different process parameters on the surface roughness,surface metal removal and surface microstructure of the inner surface of TC4 titanium alloy slender tube based on the magnetic grinding finishing equipment and the method of single factor experiment.Based on the orthogonal test,a multivariate regression prediction model for the surface roughness of the inner surface of TC4 titanium alloy thin pipe was established,and the prediction model was tested and verified by experiment.It has been proved that the relative error between the predicted value and the measured value is less than6.6%,which meets certain accuracy requirements and can be used to guide future experimental research and actual production.This article focuses on magnetic abrasive finishing machining under different process parameters on the surface quality of the index,the change rule of surface roughness prediction model is established,as the magnetic abrasive finishing machining technology provides theory basis for the selection of process parameters,to a large extent reduce the repetitive experiments,saves explore new product processing time and cost,to promote the development and application of magnetic abrasive finishing machining technology has important significance.