| With the rapid development of equipment manufacturing industry, products put forward higher requirements on machining performance. Rotary table is the main functional components of machining center and dynamic performance advantages and disadvantages, the level of accuracy have direct influence in the machine processing properties. The goal of the thesis is to improve the processing performance of the rotary table from the two aspects of dynamic characteristics and assembly precision,focus on the structure design of rotary table, dynamic analysis, structure improvement and precision optimization design etc.According to the design requirements, the selection of the motor and the simulation design of the internal circuit. Using the finite element software to establish the finite element model of the rotary table,achieve the natural frequency and mode of vibration of the rotary table, and harmonic response analysis. Using modal test equipment of rotary tables for vibration test and analysis test data table test natural frequency and vibration mode were obtained. The finite element analysis results and modal test data are compared, and the accuracy of the finite element model is obtained. Based on the results of the analysis to optimize the structure of weak links of the rotary table, so as to improve the dynamic performance of the rotary table.In order to meet the requirement of high accuracy while reducing production costs, the revolving platform for optimization in precision distribution, distribution theory of geometric error modeling using multi degree of freedom errors, and assembling error propagation model with the theory of multi-body system. Established in combination with the surface geometric errors as the design variables, processing cost and the assembly precision as the objective function of multi-objective optimization model, and the concept of Pareto optimal solution is ad- opted to satisfy the geometric tolerance of the objective function value.
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