Theoretical Analysis And Simulation Study Of Vibration System In Cascade Vibration Finishing Equipment

Barrel finishing technology, which combines mechanism, physics,mechanics, chemistry, mathematics and other subjects is a simple, low cost, high efficiency, wide functional application, less pollution processing method. While the traditional barrel finishing technology develops continuously, the new barrel finishing technology is emerging. The cascade vibratory finishing equipment was patent product of U.S. in 1980 s. After years of continuous development and improvement, now the technology has had a comprehensive and in-depth research in terms of the process test. And it has been better applied in global advanced industrial countries. With the support of Institute of Finishing Technology in Taiyuan University of Technology, our country has imported three equipments. Based on the concept of introduction, absorption, digestion and re-innovation, there is a need for intensive theoretical analysis of its vibration system. At the same time, discrete element method(DEM) is an effective method in mechanism research, which can realize real-time dynamic simulation of particle system.Cascade vibration finishing equipment was briefly introduced in this paper followed by the study of its various parts(vibration device, spring system anddynamic medium) of vibration system using different methods depending on different characteristics. And main contents and conclusions were as follows:1. The whole vibration system of equipment was force analyzed and the formula of amplitude and exciting force were derived. The relationship among the parameters(frequency, amplitude, angular velocity ratio and damping ratio)was discussed using Matlab.2. Spring system was a key component of cascade vibration equipment. The analysis and simulation of spring system were carried out. Displacement variation was obtained under the working condition. And recommendations were given for further spring research. The results showed: the fatigue life of the equipment was 5.89 × 105 and the minimum load factor was 1.337. Spring system met the equipment requirements within the scope of fatigue life. And the excitation frequency of the motor should be away from the first-order vibration frequency which was emulated as 16 Hz.3. Dynamic particle simulation was done using DEM. The variation of parameters between particle system, particle and workpiece, particle and particle were analyzed and the grids were used to select the cylindrical surfaces and the edges of the workpiece to analyze the processing results of particles on partial places of the workpiece. The impact of flow clearance on flats processing results was explored. Finally, the amplitude and frequency of cascade vibration finishing equipment were simulated.4. Additional rotational movement of the workpiece during processing and three-dimensional mode of cascade vibration were proposed and simulated due to poor processing uniformity of parts. Simulation results showed that additional rotational movement of the workpiece could improve processing uniformity.Three-dimensional mode of cascade vibration was stronger than one-dimensional mode of cascade vibration in removal capacity of the process.Three-dimensional mode of cascade vibration was applicable to processworkpieces of large removal, blind holes, flow channels and other characteristics which were difficult to process.Theoretical analysis and simulation research on cascade vibration finishing equipment were carried out and the mechanism of equipment was further clarified, providing a useful theoretical exploration for follow-up research and development.