Research On The Static And Dynamic And Thermal Property Of CNC Machine Tools Based On Machine Joints

For the precision CNC machining centers, its static,dynamic and thermal characteristics have a great influence on the processing precision of machine tool. At present, the studies on the CNC machine tools focus on integrated research, and less consideration on the influence of every mechanical joint surface of the machine putting on the properties of complete machine, such as the precision, and so on. This article focuses on the contact dynamics question of the joint surface of CNC machine tool, and with BV series precision machine tool product as the research object, researches its joint surface's static,dynamic and thermal state contact performance modeling and technology problems of digital simulation and the general method, and establishing performance model of faying surface's static and dynamic state of CNC machine tool to support the CNC machine tool's performance design and digital simulation. Therefore, the research about the CNC machine tool's joint surface and complete machine will greatly enhance the properties and development efficiency of CNC machine tool, and promote the overall level of China's machine tool to a new level. For this reason, there is a very realistic significance to study the issue of static,dynamic and thermal state of the machine tool's typical joint surface. This paper focused on the following aspects of research:First, the paper demonstrates the factor which influences the key joint surface static,dynamic and thermal characteristic of BV series precision machining center through the theoretical analysis and experimental method, and analyzes static and dynamic parameters which influences the machine joint surface characteristic.Second, then according to multi-body dynamics and organization theory, the static dynamic and thermal state theoretical model of the joint surface is established, and by using simulation technology and experiment, the model is conducted to be corrected and validated.Third, the test platform which is established to measure typical joint surface and relevant parameters, lays the foundation for the dynamic,static and thermal state experiment of complete machine. Meanwhile, finite element model of machine processing center is set up for numerical analysis. Fourth, the influence law is gained by analyzing the influence factors; at the same time, according to the experiment result, the paper determines the parameters affecting the joint surface one by one.Fifth, in accordance with the above theory, simulation and experimental data and conclusion, the paper synthesizes characters and parameters of the joint surface in the dynamics model of the complete machine, and analyses how the joint surface's propertie affect characteristics and precision of complete machine. Finally, after the co-simulation and experiment of complete machine, the analysis result needs a further correction and verification.On the basis of analyzing the components of machine tool, the paper analyses dynamic,static and thermal state of the precision complete machine and some relevant experiments are carried on to testified the analysis result and theory. This paper designs test platform of precision machine tool's related joint surface, and proposes a construction plan with certain generality about the test bench. This will provide an experiment platform for studying the impact of joint surface putting on the complete machine.