| The spindle assembly which is in the universal milling head is one of the importantcomponents of the CNC machine. The spindle assembly is directly involved in themilling, which is greatly impacted the machining accuracy, surface quality andproductivity. With the developing of modern technology, CNC machine spindle hasbeen put forward higher requirements: wide speed-range, high precision, high rigidity,small vibration, small deformation, low noise, and good resistance to forced vibrationand self-excited vibration ability of dynamic performance. Accordingly, the study ofperformance of the spindle assembly has a very important theoretical and practicalsignificance.This paper is based on the further study of GMC2000longmen boring machineproduced by a machine tool factory. The main content includes: The finite elementmodel of the spindle components and accessories, accurate simulation model ofboundary conditions, constraints, external loads and so on, static and dynamicperformance analysis for the spindle assembly, and thus to optimize the spindle basedon ANSYS and compare the spindle performance before and after optimization;According to experience in the design and the results of optimization, the most likelyinterval of spindle size is analyzed. Combined with the orthogonal experimental designmethod, the analysis of static and dynamic performance of spindle has been executed sothat to get the optimal combination of the size of the spindle, and thus the old spindleperformance and the spindle performance with the optimal size have been compared;Based on the response surface method, the performance function of the deflection,strength and mode have been got. Using the performance functions and considering theuncertainties, the spindle has been designed and analyzed for the properties; Based onthe comprehensive comparison of the optimization results of the three methods, themost realistic method can be got, which is greatly increased the safety performance andprocessing properties of the spindle. |
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