Theoretical And Experimental Research Of Vibratory Finishing For Disc Part

Under the background of the?Made in China 2025?,increasingly high surface quality requirements for parts are proposed in the manufacturing industry.Under the new demand background,the challenge of improving the surface quality of parts is a problem that researchers must overcome.As a commonly used typical parts,disc parts are widely used.The structure of disc parts,which is represented by aero-engine disk parts and high-end automobile wheels,tends to be complicated and diversified.The performance requirements are superior.And the appearance of the pursuit of beautiful and complex.This brings great difficulty to the improvement of the surface quality of the parts.It not only requires the surface roughness to be reduced after processing,but also requires uniform and smooth processing,and the automotive wheels also places high demands on the brightness.Therefore,this paper studies the technology related to the surface quality improvement of disc parts.The research work is as follows:Taking the tub vibratory finishing machine as the research object,the dynamics model of the vibratory finishing machine was established by using the software ADAMS.The software EDEM was used to simulate the particle motion during the vibratory finishing process.The EDEM and ADAMS are used to conduct co-simulation of particle motion and structural dynamics by add-in EALink,which realizes the data interactive transmission between particle simulation and dynamic simulation.In order to verify the simulation results,a test platform for vibration system dynamics testing was built.The simulation results were analyzed.Through the test result analysis of the processing performance,the rationality of the system parameters is evaluated.Then the effectiveness of the co-simulation is analyzed.Taking the problem of the unevenness of the wall of the tub vibratory finishing as the starting point,an experimental study on the attached vibrating finishing process of small thin-walled sheet-like parts was carried out.Comparing the surface roughness values of the fixed workpiece and free workpiece after finishing,the advantages of the adherent vibratory finishing and the relatively optimal processing position are determined.Based on the phenomena discovered in simulation and experimental research,the "wall effect" in vibratory finishing is proposed.And its connotation is defined.Taking the cascade vibratory finisher as the research object,the dynamic model of the excitation system is established.And the vibration synchronization theory of the double exciter and the excitation displacement transmission rate of the double mass are analyzed.On the basis of theoretical analysis,the structure scheme of horizontal indirect vibratory finishing equipment which has five-mass and symmetrical double-station is proposed.Its dynamic model is established,which provides a theoretical basis for the development of new vibratory finishing equipment.Taking the surface roughness consistency of the parts as the evaluation index,the processing experiments were carried out by using the cascade vibratory finisher.Through experimental research,the phenomenon of surface roughness inconsistency of the workpiece was found.The "wall effect" existing in vibration finishing is further confirmed.Taking the horizontal one-dimensional vibration finishing as the research object,the device for measuring the force of the particles on the workpiece and the particle velocity were built.The contact force of the particle to the wall at different positions and the velocity of the particle were obtained.The experimentally measured data was compared with the simulation results.The discrete element simulation experiment was designed by Taguchi method.The velocity,contact force and wear of granular media under different parameters were obtained.The effects of the wall spacing in the vibration direction and the bottom opening of the container on the vibratory finishing was studied.The relevant research conclusions can provide a reference for the new process.The prototype of one-dimensional horizontal vibration finishing based on pneumatic exciter was developed.The vibration performance test was carried out using the developed prototype.The measurement results show that the vibration frequency and amplitude adjusting can be realized by adjusting the air pressure and the air flow rate.The effects of the air pressure on the stability of amplitude and frequency were tested.By changing the thickness and length of the leaf spring,the output amplitude can be adjusted with a constant air pressure.The damping effect of the waist shock absorber was tested.The test result shows that the effective isolation of the vibration is realized,and the correctness of the design was verified.Taking engineering problems as a starting point,the three types finishing methods,rotary barrel finishing,centrifugal barrel finishing and vibratory finishing were compared to determine the best machining solution for aero-engine disc parts based on the discrete element method.The simulation analysis shows that under certain conditions,vibratory finishing shows better finishing performance than rotary barrel finishing and centrifugal barrel finishing.In view of the inhomogeneity of automobile wheels in one-dimensional horizontal vibration finishing,two kinds of finishing schemes were proposed.They are vibration-rotating combination scheme and reconstruction wall scheme.Through simulation analysis,it is concluded that the vibrationrotating combination scheme significantly improves the finishing performance of the wheels.Based on the conclusion,a two-wheel vibratory finishing device was innovatively proposed.It is also proved that the reconstruction wall scheme is feasible by the experimental research.