Research On Polishing Technology Of Micro Blind Hole With Dynamic Pressure Abrasive Fluid

Driven by the rapid development of aerospace technology,the processing requirements of inertial navigation devices are constantly improving.For the good desserts with simple mechanism and superior performance,dynamic coordinated gyroscope is widely used in inertial navigation.The flexible joint made of 3J33B is the key part of the dynamic coordination gyroscope,and its manufacturing accuracy will directly affect the performance of the gyroscope.The thin-walled and fine rib structure of the flexible joint is the key part of the whole part,and the machining accuracy of the structure size,shape and surface quality is very high.It is of great significance for China's aerospace technology to study the new polishing method of the inner surface of the micro blind hole and get better surface quality of the inner surface of the micro blind hole.According to the actual requirements of micro blind inner surface machining,a dynamic pressure abrasive fluid lapping and polishing method for micro blind hole is proposed in this paper.The polishing mechanism is analyzed and the polishing process parameters are optimized to realize the low stress grinding and polishing of the inner surface of 3J33B micro blind hole.Based on the analysis of abrasive fluid dynamics,the flow field of abrasive fluid in abrasive fluid lapping and polishing process is studied.Through the research of abrasive wear principle and abrasive erosion mechanism theory,the erosion process of abrasive particles on the workpiece surface in the grinding and polishing process is analyzed,and the material removal rate model of abrasive fluid polishing is established on this basis.Based on the theory of hydrodynamics,a hydrodynamic model for analyzing hydrodynamic abrasive fluid polishing is established,and a quantitative model is established to study the specific effects.The fluid dynamics software FLUENT discrete particle model is used for numerical simulation,and the polishing parameters such as grinding gap,grinding head speed and grinding head diameter are analyzed theoretically.The polishing tool with spiral groove structure is designed to increase the overall uniformity of the inner surface of the micro blind hole.The experiment of dynamic pressure abrasive fluid lapping and polishing technology is carried out for the small blind hole of 3J33B material.The effectiveness of the method is verified by the experiment,and the material removal mechanism of the dynamic pressure abrasive fluid grinding and polishing is verified,and the experimental basis is provided for the optimization of grinding and polishing process.