Study On Dynamic Characteristics Of Fixed Joint Interface In BFPC Machine Tool Structural Elements And Its Application

With the advancement of science and technology,the mechanical manufacturing industry is constantly developing towards high precision,high speed,high automation,and puts higher and higher requirements on the static,dynamic and thermal performance of machine tools.Basalt Fiber Polymer Concrete(BFPC)is considered to be a machine tool because of its high specific strength,high specific stiffness,high damping,good thermal stability,low cost and good environmental friendliness.The basic material is a new type of composite material with potential for improving the static,dynamic and thermal properties and light weight of the machine.However,the dynamic characteristics of the joint interface of the BFPC machine tools structural elements have a greater impact on its own and even the dynamic performance of the machine tools.Therefore,it is of great theoretical and practical significance to study the dynamic characteristics of the joint interface of BFPC machine tools structural elements,to accurately predict the dynamic performance of itself and even the whole machine,fully exploit the potential of BFPC materials,and design and manufacture machine tools structural elements with better dynamic performance..This paper relies on the National Natural Science Foundation of China,“ Basic Theory and Key Technology Research of Basalt Fiber Reinforced Concrete Machine Tool ”(51375219),to study the dynamic characteristics and application of fixed joint interface of BFPC material machine tool.The main research contents are as follows:According to the structure type of BFPC machine tools structural elements,the type of joint interface in BFPC machine tools structural elements is analyzed,and the BFPC-BFPC fixed joint interface is determined as the main research object.The research methods and means of common fixed joint interface are introduced.The network theory is used to analyze the neural network model framework for constructing the relationship between the dynamic performance parameters of the fixed interface of BFPC-BFPC and the interface roughness and preload of the joint interface.Using the theoretical analysis and experimental research methods,the normal and tangential stiffness and damping of the BFPC fixed joint interface of 20 sets of different joint interface roughness and preload combination are determined.The neural network model framework of the relationship between the dynamic performance parameters of the joint interface and the interface roughness and preload of the joint interface is learned and trained,and the parameters in the prediction model are determined.The MATLAB is used to realize the visual calculation between the equivalent virtual layer parameters of the BFPC joint interface and the roughness and preload.Using the transverse homomorphism theory and the virtual material method in the finite element simulation analysis method to study the characterization parameters of virtual material layer of BFPC fixed joint interface—normal elastic modulus,tangential elastic modulus,shear modulus,density and Poisson’s ratio with BFPC material performance parameters.The variation of interface roughness and preload,through the development and utilization of MATLAB,realizes the visual conversion between the equivalent virtual layer parameters of the BFPC joint interface and the roughness and preload.Taking the BFPC gantry frame assembly as an example,the specific application of the dynamic characteristic parameters of the BFPC fixed joint interface is studied.Using the multiobjective optimization design theory and the virtual material parameter calculation model established in the previous section,the BFPC gantry frame assembly can be optimized and determined.The best combination of interface roughness and preload with optimal dynamic characteristics.A simulation analysis model based on the equivalent virtual layer material considering the dynamic characteristics of the BFPC gantry frame assembly considering the dynamic characteristics of the fixed joint interface is established,and the modal analysis and harmonic response analysis is carried out,and the prototype with and without considering the dynamic characteristics of the joint interface is established.Cast iron material simulation analysis of the gantry frame assembly and the dynamic characteristics of the BFPC gantry frame assembly without considering the dynamic characteristics of the joint interface.The results were compared and analyzed.On the one hand,the influence of the dynamic characteristics of BFPC fixed joint interface on the dynamic performance of machine tools structural elements and even the whole machine was investigated.On the other hand,the feasibility of BFPC machine tools structural elements in improving its and even the whole machine was evaluated more accurately and effectively.The paper has 67 pictures,21 tables,and 77 references.