Research Of Dynamic Characteristics On CNC Machine Tool Liner Rolling Guide’s Interface

With the development direction of high speed,high precision and high efficiency of numerical control machine tool increasingly,advanced dynamic design methods should be adopted to enhance the competitiveness of enterprises of our country machine tool,the premise of this method is to establish accurate dynamics models containing bonding surface of the machine tools.Linear rolling guide is a functional unit used in modern NC machine tools,the dynamic performance of which has very important influence to the dynamic performance of the NC machine tools.Therefore,the analysis of dynamic characteristics of the combination of linear rolling guide has great significance to promote the production and manufacturing level of our country machine tools.Therefore,the analysis of dynamic characteristics of the combination of linear rolling guide,with great significance to promote our country machine tool production and manufacturing level.This paper is based on BRH45 linear rolling guide of ABBA guide rail for example,theoretical calculation,finite element analysis and experimental method are used to study the dynamic characteristics and the guide rail combination and its modeling method.The theoretical model and finite element model of linear rolling guide are established,and its accuracy is verified by experimental method.The main research contents are followed:Firstly,the research status and main existing problems of the dynamic characteristics of domestic and foreign machine tools joint surface and rolling guide combination are summarized,the main methods and key technology in the study of the dynamic characteristics of the current combination are introduced,the connecting approach of theoretical research,finite element analysis and dynamic test analysis is given in this paper.The structure principle and development trend of the slide guide are described in detail,the parameters characterized dynamic performance of guide rail system are put forward,the existing analysis methods are summarized,some problems existing in the modeling process of guide rail are pointed out,the development trend of the research method of the guide rail system dynamics is discussed.The rationality of contact modeling is put forwardAccording to the theory of Hertz contact,the analytic modeling of the guide rail is established,the mechanical properties affect is analyzed effectively.Hertz contact modeling and contact stiffness calculation of BRH45 guide rail are carried out,the relationship between stiffness and external loading is obtained,which offers a theoretical basis for the establishment of the finite element model.The theoretical calculation and finite element analysis of the single slide guide are carried out,the accurate finite element model of linear rolling guide combination surface is established systematically,via detailed finite element analysis,the dynamic characteristics of the guide rail are obtained,the consistency of the theoretical model and finite element model is verified.The dynamic vibration experiment on BRH rail is conducted,the actual dynamic characteristics of linear rolling guide are acquired,the accuracy of theoretical model and finite element model is verified by the comparison of resulting data.The valuable references are then provided for the design and analysis of the whole machine tool.The research method of the dynamic characteristic of Linear rolling guide bonding surface proposed in this paper can be applied to research on combination surface characteristics of other machine tools,which makes the dynamic modeling of the whole machine tool to be possible,providing a basis for the dynamic design of NC machine tool.