One of the important factors resulting in the high-speed machinery performance is its machine tool dynamic characteristic. It will directly influence the final manufacturing capability of the machinery and it is also the important criterion of evaluating machinery performances. Especially, the dynamic characteristic of spindle assembly has large effect on manufacturing capability of machinery. So it is very important both analyzing dynamic-static characteristic of the spindle assembly and machine tool of high-speed machinery and studying the effect to machinery function. Using Finite Element Analysis software did a Finite Element Analysis of spindle assembly of the high-speed machine tool, and some experiments are done to validate the result the Finite Element Analysis results.

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To design a machine tool successfully, its essential parts should be analyzed and evaluated after design but before prototype being made. The spindle assembly is one of the most essential parts of high speed machine tool, so how the dynamic characteristics of the spindle assembly affect the performance of high speed NC machine tool are of great significance and should be studied. This paper’s research is based on a high speed machine tool manufactured by some plant. The finite element analysis model of the spindle assembly of the high speed machine tool was developed by taking the advantage of the spring-damper element to simulate the bearing supports. The modal analysis was made to confirm the dynamic characteristics of the spindle assembly, and the results were compared with the testing ones.

Lathe bed is one of the important parts of machine tool, and its performance will affect the final machining accuracy of the machine tool directly. A numerical control lathe produced by a machine tool plant was taken as the research object, the finite element analysis and optimization method of the Lathe bed were studied. First of all, the external load of the bed was analyzed, static performance finite element analysis of the bed was implemented, and the corresponding analysis results were obtained. Then, the evaluation methods were discussed, and the deformations of junction areas were studied. At the same time, its effect on the performance of machine tool could also be analyzed. Based on the topology optimization method, the conceptual model of Lathe bed could be acquired, and also the rationality of the existing machine tool structure was discussed. The finite element analysis and optimization method of Lathe bed were concluded, which are helpful to obtain the static characteristics of the Lathe bed accurately. Moreover, there is an important practical significance to design the Lathe bed reasonably and to promote the machine tools comprehensive performance.

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