| In aerospace and other working environment that requires high speed,high pressure,low noise,and high reliability,various burrs on the surface of the spool,especially the burrs on the edge of the ring groove,will affect its matching accuracy,sealing performance and flow resistance,and reduce the reliability and stability of the whole mechanical system.However,the traditional burr removal method is difficult to remove the spool burrs effectively and evenly due to the diversity,small batch and high surface precision of the spool parts.Therefore,this paper proposes to apply the deburring technique of Fluid Magnetic Abrasive,which has good surface adaptability,good controllability,small temperature rise and high processing quality,to the surface finishing process of spool parts,this paper design a set of Fluid Magnetic Abrasive finishing equipment suitable for surface finishing and deburring of spool parts through theoretical analysis,and develop a new type of Fluid Magnetic Abrasive,and finally develop a set of spool parts deburring process through series of experiments.This paper focused on the following parts:(1)By analyzing the microscopic mechanism of Fluid Magnetic Abrasive surface finishing deburring and combining the material removal model,this paper briefly describe the surface finishing equipment of Fluid Magnetic Abrasive tools,the configuration technology of Fluid Magnetic Abrasive tools and the burr removal technology of spool parts,respectively,and propose an overall plan of spool parts deburring process.(2)A surface finishing device for Fluid Magnetic Abrasive is designed,built and debugged.Through the simulation and the optimization of the structure of magnetic pole plate,a set of magnetic field generator with multi-parameter adjustable and simple and compact structure is designed.Through the theoretical calculation,the power plant is designed based on the gantry triaxial motion module,and the data control card and the PLC control are designed to realize the automatic control and feedback mechanism.(3)A new kind of Fluid Magnetic Abrasive is developed with guar gum as additive to improve the settling stability of Fluid Magnetic Abrasive.Firstly,a comparative study on the sedimentation of guar gum was conducted.It is found that when the content of guar gum is 0.4%,the comprehensive performance of abrasive tools is the best.The new Fluid Magnetic Abrasive is compared with the three common formulas in the market,and it is concluded that the new Fluid Magnetic Abrasive significantly improved the settling stability of the abrasive,while at the same time,the processing efficiency is not affected,and is more suitable for the deburring finishing of valve core parts.(4)Basic experimental study of 45 steel specimens with grooves is conducted,the evaluation criteria are the burr removal,the surface roughness and the decreasing value of the outer circle diameter.A single factor experiment is carried out to analyze the five factors affecting the deburring performance of the liquid magnetic abrasive: silicon carbide particle size,magnetic induction intensity,motion mode,specimen rotating speed and processing time.The results showes that the processing effect and the processing efficiency is the best under the following situation: when the silicon carbide particle size is 180μm,the magnetic intensity is 207 m T,the motion mode is the combination of rotary motion and axial motion,the rotating speed of the specimen is 500 r/min,the processing time is 30 min.(5)The validation experiment is carried out with the spool parts as the processing object.The evaluation method is focused on comparing the burr removal condition,surface roughness and the decreasing value of outer circle diameter.The parameter optimization experiment of the spool rotating speed and processing time is carried out,and the specific processing parameters of the Fluid Magnetic Abrasive deburring for the spool parts are determined.Spool burr removal is best when the speed is 600 r/min,the processing time is 70 min,the motion mode is the combination of rotary motion and axial motion,the magnetic strength is 207 m T,the silicon carbide particle size is 180μm. |
