Research On The Key Technology Of Solid-liquid Two-phase Magnetic Fluid Precision Machining Variable Diameter Pipe

With the rapid development of science and technology,engineering processing technology has also been rapid development.As a precision machining technology in the field of machining,the content of abrasive flow machining technology has also been greatly developed and expanded.Solid-liquid two-phase magnetic flow polishing technology is developed on the basis of traditional abrasive flow polishing technology.The solid-liquid two-phase magnetic fluid polishing technology can process the workpiece surface more effectively and reduce the surface roughness of the parts effectively.Variable caliber pipe parts are widely used in many industrial fields.Therefore,the research on solid-liquid two-phase magnetic fluid polishing variable caliber pipe has great practical significance and practical value.The abrasive is the main polishing tool of the solid-liquid two-phase magnetic fluid polishing.According to the structural characteristics of the variable caliber pipe,the solid-liquid two-phase magnetic fluid with magnetic particles and abrasive particle size is prepared.In addition,the performance of polishing fluid is tested,the viscosity and shear force of the fluid are tested,and the influence of abrasive particle size on the performance of polishing fluid is discussed.Thus,a suitable magnetic polishing fluid is prepared for the solid-liquid two-phase magnetic fluid polishing variable caliber tube test.Based on the theory of ferromagnetic fluid,the six order variable diameter pipe model is simulated and analyzed.The six order variable diameter pipe is analyzed with different numerical levels of three factors: inlet speed,magnetic field strength and particle size.The effects of dynamic pressure and wall shear force on the polishing quality of the six order variable diameter pipe are discussed.Based on the seven order variable diameter pipe model,the influence of the maximum value of three factors on the polishing effect is studied.The influence of dynamic pressure and wall shear force on the quality of variable diameter pipe is discussed and verified.The polishing test of solid-liquid two-phase magnetic fluid was carried out,the sixth order variable diameter pipe was orthogonal test,the seventh order variable diameter pipe was validated test,and the surface morphology and surface roughness of the inner surface of the workpiece were tested and analyzed.After the solid-liquid two-phase magnetic fluid processing,the workpiece of variable diameter pipe obtained better surface morphology.Through the range variance and regression analysis,the optimal parameter array is obtained and the linear regression equation is established.The linear regression equation is verified by the surface roughness test data of the seventh order variable caliber pipe.The actual measurement value is within the prediction range of the regression equation and close to the fitting value,which proves the accuracy of the regression equation and provides technical support for the actual production and processing.