Research On Typical Joint Surface Properties Of Heavy Machine Tool Based On Similarity Theory

As the basic equipment of manufacturing industry chain, Heavy machine tool’s working performance and the processing precision will affect the entire industry production level. In the process of Heavy NC machine tool design, the combination of static, dynamic characteristics directly determines and influences stiffness, damping, machining precision and work efficiency, Therefore the research on the combination of the characteristics become extremely important to the success of machine tool design. This paper mainly studies the dynamic and static characteristic parameters of heavy machine tool guide-way joint And put forward a practical machine tool combining surface analysis method according to the experimental verification.First the passage introduced the research situation of the combination of static and dynamic characteristic parameters of surface analysis method at home and abroad. At present, the research on combining is mostly analytic research, Different mathematical model is established based on the combination of macro and micro characteristics of surface properties. In this paper, It was given that microscopic contact stiffness calculation formula of small test guide surface and heavy machine tool combining surface based on the mature theory model and combining the concrete specimen and machine tool structure. In relation to combination of surface dynamic parameter analysis, the paper introduced the vibration damping and the main dynamic parameters of the combination. At the same time, it introduced how to obtain the analysis and test of the dynamic parameters to the combination.Secondly, it is presented that small linear guide as a scale model based on similarity theory. And make a research on the static and dynamic characteristics of small guide joint and the conclusion extended to heavy machine set of faces. And the conclusion is extended to the heavy machine set of faces. In this paper, according to analysis and comparison of the small linear guide rail and heavy machine tool guide surface from the similarity of geometric and kinetics, After the theory of similarity verification, there is similarity between the small linear guide surface and heavy machine tool guide surface. For small linear guide, it obtains the surface static stiffness and the first five natural frequencies and corresponding damping ratio with the test method. And we make the static stiffness from the experiments as the important input parameters of finite element analysis, this will make the analysis model of the physical parameters are more close to the real component parameter.In this paper it is introduced the spring damping unit of combined surface characteristics simulation during a small test about guideway dynamic performance analysis. Thus it can more effective simulate influence of combination of surface characteristics to components of the overall structure. The method proposed in this paper can be used to predict and analysis of static and dynamic characteristics of large joints.At last, with the example of planer type milling machine XK2420series CNC boring milling machine, the paper analyze the dynamic performance of machine tool bed rail section by the verification, and treat extraction of the first five modes as the analysis and forecast of the models of guide-way joint dynamic performance., The results can be used as reference data about structure and design of the machine tool due to the similarity principle and error range.