Research On Burr Formation Mechanism Of Spool Shoulder And Deburring Technology

The servo valve is an essential component of the electro-hydraulic servo system,and its accuracy directly affects the performance of the entire system.In the processing of the servo valve spool,there are problems such as difficulty in removing burrs,low processing efficiency,and uneven surface quality,which makes it difficult to achieve batch processing.This work starts from the grinding method of the spool shoulder,analyzes the mechanism of burr formation and its influencing factors,improves the processing technology of the spool shoulder,and develops a set of grinding and synchronous deburring system.Finally,experiments are used to verify the correctness of the simulation and the effectiveness of the device.First,the direction and area of the burr formation are determined by analyzing the grinding method of the spool shoulder.A cutting model formed by edge burrs was established to analyze the influencing factors of different types of burrs.The mechanical model and mathematical model of burr formation are established,and the force state and its change when the cutter cuts the edge are analyzed.The theoretical size of the burr size and the influencing factors of the negative shear angle are obtained.A single abrasive micro-cutting simulation model was established by Abaqus,and the mechanism of edge burr formation was discussed based on the simulation results.By establishing the simulation model under different cutting parameters,the size of the burr is counted,and the influence of cutting parameters such as grinding speed,grinding depth and grinding wheel size on the burr size is obtained,and the spool shoulder is matched according to the actual machining condition.Optimal parameters.The burr removal method is selected,and the important parameters in the burr removal process are obtained by simulation.A set of grinding and deburring scheme based on force feedback is designed and integrated with the auxiliary grinding part of the spool shoulder to design the overall structure,electrical system and software of the device.A static analysis of the deburring structure is performed to test its ability to withstand eccentric loads.In order to avoid excessive deformation during processing,Ansys was used to analyze the burr structure.Finally,the S20 grinding machine was used to perform the grinding and deburring experiments of the valve spool.The spool shoulder is matched to the determined optimum cutting parameters.Observe the shape of the burr and compare it with the simulation results to judge the correctness of the simulation.The spool shoulders are grouped and subjected to grinding,grinding and simultaneous deburring experiments.The edge state of the two sets of shoulders was observed with a microscope to verify the rationality of the device design.The test results show that the shape of the burr fits with the simulation results,and the device can remove the edge burrs of the shoulder.