The Structure And Material Design Of The Resin Concrete Machine Tool Base And Its Experiment Study

Ultra-precision machining technology extends to the scales of micron, submicron and nano, which requires the processing and measuring equipment to have a higher accuracy, static & dynamic performance and thermal stability. Traditional cast iron material fails to satisfy the design requirements of the ultra-precision machines, while resin concrete composite material is more suitable for ultra-precision machining due to its high damping, vibration resistance, stiffness weight ratio and thermal stability. Resin concrete is a kind of viscoelastic composites with pebble, granite, quartz sand etc. as aggregates, thermosetting resin as binder. The negative thermal expansion material(NTE) contracts upon heating during a certain range of temperature change and the coeeficient of the composite can be controlled by adding NTE. Among the NTE materials, Cubic Zirconium Tungstate(ZrW2O8) contracts continuously over a wide temperature range from 0.3 K to 1050 K. This material has been discussed a lot however there is not much research about the detailed application of ZrW2O8. Since NTE material can pose a great effect on the thermal stability of the resin concrete, we investigate the addition of Zr W2O8 to resin concrete to explore the prospects for reduced thermal expansion of thermal stable composites.Firstly, based on the novel mathematic aggregates gradation model, the continuous and discontinuous gradation models were built. Secondly, the prediction model on thermal expansion coefficient of resin concrete was built based on meso-mechanics method and three-phase composite sphere model. Thirdly, 2D and 3D irregular polygon aggregates particle packing model was set up by Matlab software and the properties of the packing model were simulated by Ansys finite-element software. The simulation results were compared with those of cast iron and the results showed that resin concrete performed better than cast iron in acoustic performance and thermal stability performance. Finally, the experiment of several influencing factors was designed, resin concrete samples were made and performance tests were taken. The results showed the influencing trend of the factors.The prediction model on thermal expansion coefficient of resin concrete provided theoretical basis for further research. Meanwhile, adding ZrW2O8 to resin concrete makes resin concrete perform better in mechanical properties, vibration-absorbing performance and thermal stability.