| With the acceleration of the modernization process,the requirements of parts accuracy are higher and higher,and the development of equipment manufacturing industry is paid more attention.For manufacturing industry and its important machine tools,the core part bed plays a great role in supporting the processing parts and reducing vibration.The traditional cast iron bed material has poor vibration damping performance,serious pollution and high energy consumption in the manufacturing process.The natural granite bed material deforms when it is wet,which leads to the deviation in the processing process and the decline of processing accuracy.Compared with the former,the resin concrete composite has the advantages of high production efficiency,strong anti vibration performance,easy to obtain raw materials and low price,which can meet the requirements of ultra precision machine tool processing,and is of great significance to reduce the vibration of machine tool.This paper studies the preparation and mechanical properties of resin concrete composite in detail.It is proposed that the hybrid steel fiber and polypropylene fiber are used as the reinforcing phase of the resin matrix.The research on the aggregate gradation is carried out in-depth,and the mechanical properties of the composite are improved on the basis of ensuring high damping performance.The specific research contents include: Based on the "atomic dense accumulation theory",the best aggregate stacking and sparse stacking void ratio of the same particle size are calculated,and the best grading and content of aggregate are studied based on the "best fill theory of Horsfield";the performance and reaction principle of various components of resin concrete composite are studied,the curing law and reaction mechanism of the group interface are systematically analyzed,and the material is optimized Material preparation process.The load interface transfer law,the viscoelastic energy loss mechanism of resin are studied,and the stress transfer model of each component is established.Based on the actual working weight of the machine tool,the load is added after the stress analysis of each part of the bed,and the static and dynamic finite element analysis is carried out for the resin concrete bed body.Based on the variable density method,the optimization objective function is to establish the minimum flexibility of the resin concrete bed,The stress and volume of the bed of resin concrete material are constrained,and the irregular model of bed topology optimization is obtained.The irregular bed model is supplemented in Creo.The static and dynamic performance analysis is carried out again for the added regular model of the grinder bed.The comparison with the optimized bed is made.Finally,the mold of grinder bed is designed.Through the study of the densest accumulation of aggregate,the aggregate gradation is obtained,and the content of various aggregate gradations is obtained according to a.h.m.andreasen formula;the binder system,aggregate system,filler system and hybrid fiber are optimized,batch specimens are prepared,and the performance parameters of resin concrete composite specimens are obtained;through the finite element analysis,the dynamic characteristics of resin concrete bed are better,and the static properties are better After topology optimization,the resin concrete bed with better static and dynamic characteristics is obtained. |
