Large Eddy Simulation And Process Research Of Polygonal Spiral Curved Tube Processed By Abrasive Flow Machining

In today's era,the demand for products with superior surface finish and quality has greatly increased,prompting industry products to have better functionality and market sustainability.However,it is difficult to precisely process the special-shaped curved surface products with high surface quality requirements.Abrasive flow machining technology is an effective technology in the field of machinery for precision machining of special-shaped curved surface products,because it can achieve micro cutting effect when abrasive particles enter the internal surface of the parts with special-shaped curved surface that are difficult to contact,so as to meet the actual requirements of high-efficiency finishing of the internal surface,reduce the surface roughness of the workpiece,and improve the accuracy of the workpiece.Therefore,the research on the inner surface quality of special-shaped curved surface parts has important practical engineering application and academic value for improving the performance of this kind of products.The large eddy simulation method is used to simulate and analyze the solid-liquid two-phase abrasive flow.The polygonal spiral curved tube is taken as the research object.The static pressure,dynamic pressure,turbulent kinetic energy,turbulent viscosity,wall shear force and abrasive flow trace of the polygonal spiral curved pipe are studied from different inlet pressure,different abrasive concentration,different abrasive particle size and different processing time,and numerical analysis of fluid flow distribution,in-depth analysis of abrasive motion,reveal the formation mechanism of fluid vortex,and discuss the mechanism of abrasive micro cutting.The results show that after the abrasive flow machining,the surface roughness Ra value of all kinds of parts is significantly reduced,the surface morphology of the workpiece is flat and smooth,and the surface quality and workpiece precision are significantly improved.According to the test data,the orthogonal test range and variance analysis of the core factors of abrasive flow machining are carried out,the influence order and factors of process parameters on abrasive flow machining are clarified,and the best process parameters are obtained.Through the experimental research and data calculation,the multiple regression mathematical model is constructed for regression analysis,and the calculated fitting value is close to the test value,which confirms the mathematical model,and the ideal surface quality is obtained.It provides theoretical guidance and technical support for the core process research of abrasive flow machining.