The Static And Dynamic Performance Study Of High-speed Vertical Spindle Box

China's machine industries have focused development on improving the high-speed cutting, feed rate, and precision of machining centers. The high-speed vertical machining center has become a priority-supported project in the major technology projects "high-end CNC machine tools and basic manufacturing equipment". It is part of the goal for china's national mid and long term science and technology development plan. The machining center requires not only good static performance, but also good dynamic characteristics. For this reason, the static and dynamic performance study of high-speed machining center was conducted. The headstock and other major infrastructure components directly affect the processing performance of the spindle system and even the entire machine tool. The method adopted can also be applied to other components. The machine performance analysis, and the technical support for improving the overall performance of machine tools were provided.First, This thesis introduced the topic research background.The based structure parts of the spindle box was designed and the stress analysis was made. Then, the principle of main shaft system was introduced. The different design scheme was analyzed in the same conditions. Finaly, the structure was optimized.Spindle box's three-dimensional finite element model was created, the degrees of freedom were fixed based on the movement. Finite element software was also used to simulate a custom unit. Through static analysis, modal analysis, harmonic response analysis, and sensitivity analysis, the static stiffness value, dynamic stiffness value, natural frequency, corresponding mode shapes and other parameters of the spindle box under certain load conditions were obtained. A reliable theoretical basis was provided for the design of the high speed machining center. The results of the finite element analysis were compared with the machine design requirements. Part of the model was improved. At the same time, spindle box modle was optimized by using Pro/E's design optimization method. The parametric design variables were screened by the sensitivity analysis. The main design variables affecting the goals were searched, and the unreasonable size range were deleted, avoid the wrong operation, reduce the analysis time. The speed and accuracy were optimized to achieve the most optimal design for spindle box.Establish headstock Virtual Prototyping System by using the software Pro/ ENGINEER, simulation and vibration analysis was exercised in ADAMS. The analysis results showed the test data from each node of the part in the work process, the spindle box was replaced with flexible body, the vibration analysis was completed after the amended of the spindle system motion parameters, the vibration of the spindle systerm was influenced by the connection stiffness and damping, its effective regulation can improve the quality of the product obviously.