Dynamic Simulation Analysis Of M115W Grinder Shaft And It's Parameter Reverse

As a processing technology to get high-precision, Low roughness surface and finish high hardness surface, grinding which is the key technology of modern manufacturing increases the proportion in cutting. In this paper, the static and dynamic analysis has been achieved to the spindle system of M115W grinder and the objective function to minimum equivalent stress concentration factor of the transition curve of the shaft shoulder was achieved. Using the objective function, the optimal design and parameter reverse was obtained. Then the flow field analysis of hydrostatic and hydrodynamic bearings of the spindle was achieved. The main work of the thesis is as follows.1. Under useing of machinery design method and Finite Element Simulation (FEM) software, spindle system of M115W grinder is analyzed in static and dynamic to find natural frequency and vibration mode. And the results indicate that the operating frequency of the spindle system is much less than the first natural frequency under prestress, the spindle system will not produce a resonance when working.2. Based on optimum design theory, by using FEM software Ansys, stress and strain was simulated in shoulder section of multi-diameter shaft under the action of reverse and bending moment. Transition curves of shoulder section were optimized by using circular curves,2-4 times spline curves,the index function curve and e index function curve, and the results indicatide that much is the radius of the circular curves or smoother is the Spline curves, less is the index of equivalent effective stress. As well as analyzing the index of equivalent effective stress in different conditions, mapping relations were reversed between circular radius, spline coordinate and the index of equivalent effective stress. and the results indicatide that polynomial and exponential function fitting results was satisfactory.3. Under consideration of fluid simulation basic theory, pressure distribution and carrying capacity of bearing oil film in various spindle speed are presented by analyzing and simulating fluid flow of bearing oil film in Ansys software FLOTRAN CFD. Under the sistuation that the spindle is static and turn soon 1 m/s and 10 ms/s, the carrying capacity of bearing oil film are 8267 N,9206 N and 25014 N, And the results indicated that the carrying capacity of bearing oil film is great in higher speeds conditions. The output pressure will not make the oil film break when working, the carrying capacity of the spindle system can satisfy a work request completely.The research of the thesis obtained following several results. The first,the method that transition curves of shoulder section were optimized by using circular curves,two-four times spline curves,the index function curve and e index function curve.The second,the method of reverse the index of equivalent effective stress. The third,build up mapping relations of between circular radius, spline coordinate and the index of equivalent effective stress. The fourth,the method that analyzing and simulating fluid flow of bearing oil film for spindle.