The final manufacturing performances of the machine tools will be influenced by its thermal characteristics seriously and accurately predict thermal characteristic is helpful to improve the machine design level. Based on the analysis on factors that influence machine thermal characteristic, finite element analysis model of the headstock has been constructed, and the steady temperature field distribution and thermal equilibrium time calculation of the headstock are calculated, and then the temperature field and thermal deformation of the headstock under the action of heat and structure load have been calculated, and analysis to identify the trend of the spindle assembly and headstock heat distortion are also been done. The analysis reveals the machine processing performance influence will be influenced by the hot asymmetric, the study give priority to spindle assembly of optimization design, thermal error compensation.

Modal analysis for the truss structures of machine tool is very important. based on ANSYS, according to the truss structures of machine tool, the modal analysis is carried out in this paper. Afterwards, the first ten natural frequency, corresponding mode shape is obtained. By means of animation, ten-order modal vibration rule has been analyzed. The modal analysis is made by ANSYS11.0. It provides the theory for the design and application of truss structures.

The dynamic characteristic of junction surface is an important part of the dynamic characteristics of NC machine tools, and it is sometimes the weakest link of the machine tool's dynamic characteristics. The precision of the finite element calculation of the machine tool's dynamic characteristics shall be affected by the junction surface parameters directly. Linear Motion guide is one of the most widely used components of the NC machine tool, and its characteristic is one of the most important components of the performances of the NC machine tool. The HSR series of linear motion guides are taken as the object of the paper, and its static and dynamic characteristics are studied. And the parameters of static and dynamic characteristics of HSR, such as static stiffness, natural frequency and modal shape are obtained. The accuracy of the finite element analysis mode is verified, which establishes the foundation for the dynamics analysis of machine tool.

The linear rolling guideway is one of the most essential parts of the machine tool. So it is very important to analyze the dynamic-static characteristic of the machine tool by considering rolling guideway for the study of the effect on machinery function. The research is based on a NC machine tool produced by a certain plant of machine tools. In this study, methods of simulating the rolling guideway support were studied; and the configuration of the spring damper elements of the bearing supports were investigated. The finite element analysis on the CKS6125 machine tool was used to confirm its dynamic characteristics. The finite element analysis models were validated by some experiments.

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.