Material Expoxy resin Curing agent Toughening agent Filling material Sand Aggregate material Remark E-44, a yellow viscous liquid T31, a modified darkbrown amine resin liquid Dibutyl phthalate (DBP) Organic and inorganic filling material Coarse sand (d is 1.2～5.0 mm), fine sand (d <1.2 mm) Coarse aggregate material (d is 2.5～20mm), fine aggregate material (d < 2.5mm) Mass/kg 136.8 51.4 17.2 248.3 346.5 1012.6
According to the mix proportion above, the dried powder of the aggregate materials that are cleaned and dried, is put into mixer with E-44 epoxy resin, toughening agent and low-shrinkage agent after measured respectively. 25 minutes later, measure again according to the size of the mold, and inject into a mold with the size of the surface 70mm× 70mm, and the length 150mm. Compact with vibration (the frequency is 3000Hz and the amplitude is 1mm ) without bubbles discharge and mixture sinking, stay 40 minutes, release them by using the releasing agent silok-8707 and then put them into an oven with the temperature 40℃, the artificial granite specimen will be produced after 28 hours. The physical properties of the resin concrete (artificial marble) that obtained from the experiment are listed in Table 2, accompanying with the property indexes given by USA (ASTME—756—83) and Geman[3]. Table 2. Comparision on physical properties of the resin concrete (artificial marble) between China and other foreign countries

0 Preface
With the development of society, modern mechine equipments tend to high speed, high efficient and automatical, the problems of vibrations, noises and fatigues of machines are more and more prominent. Vibrations and noises not only worsen the environment between people and machines, but also threaten the operators’ health seriously and result in mental and physical fatigues. What’s worse, the random broadband excitation can bring about multi-formant responses that cause electronic devices useless, instruments imprecise, and the structures of the mechanical components fatigue. At the same time, it will affect the stabilities and reliabilities of the mechanical equipments badly and reduce the compaign life, either[1]. Especially for spacecrafts, satellites and other aerospace structures and aircrafts, submarines and other military equipments, structural vibrations can cause damage to carriage machines, decrease the accuracy of the antenna position, or make the navigation facilities useless. Therefore, reducing vibrations, decreasing noises and improving the environment between people and machines are the right things to solve. Nowadays, a lot of methods and techniques to solve the problems of vibrations and noises in actual engineering are developed, among which the damping technology is the most effective and important one to control structural resonances and noises. Bearing parts have a great impact to the dynamic characteristics of the entire machine tools, therefore how to improve the dynamic characteristics is the key point to the design of the machine tools. The bearing parts should meet the requrements of high stiffness, long compaign life, high damping and thermal stability, current material that used widely is cast iron. By using resin concrete to fill or replace cast iron is an effective measure to improve the dynamical characteristics of bearing parts. The paper analyzes the attenuation effect of the resin concrete and the cast iron specimens by experimental study.
1. Preparation of the resin concrete specimen
The biggest difference between resin concrete and ordinary one is that the resin concretes use resin, curing agent, diluent agent, toughening agent and other materials replace concrete and water, and then turn into resin concrete after the solidification of the aggregate and the filling materials. The preparation of resin concrete needs long natural aging and then the macrostructure is uniform, the linear expansion coefficient is minimal and the internal stress disappears completely without deformation. They also have a good rigidity and are not afraid of being eroded. What’s more, They are unlikely to get scratched and can maintain accuracy without being affected by the change of temperature. Above all, resin concrete can not be magnetized and can move smoothly when measured, and will not be affected by moist air,either. The optimal mix proportion of resin concrete can be listed in Table 1 by experimental research. Table 1. The optimal mix proportion of resin concrete