Study On The Softness Abrasive Flow Machining Oriented To Titanium Alloy Complex Surface

Titanium alloy artificial joints have complex structures and poor thermal conductivity of materials.Traditional precision machining methods are difficult to obtain ultimate shape accuracy,dimensional accuracy,surface roughness,and surface integrity.The soft abrasive flow precision machining method is excellent in satisfying the polishing needs of titanium alloy artificial joints due to good shape adaptability and ultra-low processing temperature.Aiming at the titanium alloy artificial joints,a method for processing turbulent flows with soft abrasive grains on complex surfaces was proposed so that the distribution pattern of the turbulent flow field in the abrasive flow was analyzed and the regulation of abrasive flow was studied.Based on the slurry erosion model,the movement of the particles in the confined flow channel was analyzed and a wear particle flow removal model was established.This model not only considers the influence of particle velocity and pressure on the wall surface in the near wall region,but also adds the curvature factor of the workpiece surface.According to the previous research,the constrained flow channel was designed.Using the Eulerian model and the enhanced wall processing function in the Fluent software,the velocity of the particles in the near wall region and the pressure of the particles on the wall surface were calculated.Combined with abrasive flow material removal model,in order to eliminate the effects of particle velocity and wall pressure distribution on abrasive flow processing,an optimized confined flow channel was designed for the further experimental study on the effect of the curvature of the workpiece surface on the abrasive flow machining.The experimental platform was designed in conjunction with optimized confined flow channels and conducted related experimental studies.The material removal quality of each processing area was obtained,and the correctness of the theoretical model and numerical simulation was verified.The average roughness of the entire plane was reduced from 294.49 nm to 62.11 nm.Those results show that the complex surface abrasive flow processing has very good controllability and practical application effect.And it has important guiding significance for the further improvement of the design and development of automatic processing equipment for the processing turbulent flows with soft abrasive grains on complex surfaces.