The Research Of Dynamic And Static Characteristic Of Resin Concrete Machine Bed

As the scientific and technological development, the performance of machine tools have become increasingly demanding,high-precision, high efficiency, low energy consumption is a long-term development direction of machine tools, in the machine's various components, bed is the basis of the entire machine which whthstand the force of various of aspacts from the parts, while various deformation is gives rise to itself, it's static and dynamic characteristics direct to impact on the performance of the entire machine, so it is an extremely important component.The resin concrete is a new materials to product the bed, which has high strength and stiffness, good damping characteristics, a good absorber and wear resistance. This paper studies the dynamic and static characteristics of resin concrete bed, It has important theoretical significance and practical significance for improving the machining accuracy and improving the economic efficiency of enterprises.CY-HTC4050, a high-precision CNC lathe produced by an enterprise in YunNan, is the research object of this thesis. Its main structural characteristics embodied in its granite 45°oblique style bed. how to analyze the material bed of the dynamic and static characteristics, has very important significance to the development of the materials and engineering application. The main work has been done as follow:1. I have done the static stress analysis of resin concrete bed, it is mainly to solve the problem of force and torque's simplified and force and torque exerted. A detailed calculation of bolt pre-tightening force on bedside box and the pressure on the four guide.2. I have done the finite element modeling on the bed, and have done a static analysis, modal analysis.3. After analysis of experimental modal on the lathe bed, I determined the order of the modal, fit every order of modal and done the correlation test. Finally, done the damping ratio parameter. identification of each measure point.Conclusions are as follow: 1. I have done the analysis of theoretical modal and experimental madal, after compared and verified, I obtained the natural frequency of the lathe bed, and it natural frequency has exceeded its scope of woek. Thus, designers can predict the dynamic characteristics of the designed structure by this result. Then they can avoid the resouance and avoid the resonance effect on work.2.Through the modal parameter identification,correlation matrix calibration, I got the reliability and accuracy modal, and enveloped the picture of impulse response function,we get the damping ratio of the resin concrete bed is 0.05,and it is 8.33 times of the cast iron. This result shows that the resin concrete's damping property is superior than cast ion's.