The Study On Technique Of The Resin Transfer Molding For The Main Insulative Board Of The Open Circuit Insulator Of The Light Rail

RTM technology is a more suitable varieties, volume, high-quality production of the composite molding technology。Have developed rapidly in recent years, NASA of the United States attached great importance to RTM, It is resin infiltration into the closed mold materials and enhance the curing process, then solidify. There are four steps in this process: (1) Lay the fiber. The fiber can either be weaved into the product's shape in one time or laid into the mold layer by layer, or both; (2) Resin injection. Resin and activator are mixed in the motionless mixer before injecting by the former of the injector.;(3) Resin solidify. Heating the mold cavity so as to solidify the resin. (4) Take product out from the mold. When the resin is solidified, open the mold and get the part. The mold of RTM is closed, so the quantity of styrene volatilization is small. It can improve the working condition and satisfy the standard of harmful gas ejection. In this paper, combining the main insulative board of the open circuit insulator of the light rail RTM process, the molding theory, choice of the material, numerical simulation analyses and testing for the performance are researched.1. Study on the rheology theory for RTMThe resin filling process of RTM is analyzed, including the preparing phase, resin flow phase , resin solidify phases and some measure means for the resin permeability and penetrate ratio. Study on the mathematic model for resin filling process, including conservation of momentum equation, conservation of mass equation and conservation of energy equation.2. Materials chosen for the main insulative boardThe base Insulation materials is the modified phenolic resin matrix, adding a certain amount of epoxy resin。This material has the advantages of high mechanical strength,Stable performance.The reinforced material is non-alkali glass fiber, the good mechanical properties can be testified. The outer dope of the main insulator is the organic silicon rubber, the resistance for water and aging ,insulated capability is remarkable.3. Study on numerical simulation of RTM filling process for the main insulative boardFocused on the main insulative board of the open circuit insulator of the light rail, firstly builting the entity model for the insulator, then using Moldflow software to numerical simulate the effect of the injection pressure, resin viscosity. The results show that the injection pressure is an important parameter. During the moulding, guarantee soakaging the glass fiber effectively, reduce the injection pressure to lessen the scouring to the fasciculus. The resin viscosity is also an important parameter which has the effect on the moulding. When the resin,s viscosity is exorbitant, the flowing and soakaging will be difficult, but when the resin,s viscosity is very low, the flowing will be unstable and the production will have the disfigurement of the hole . Adjust the place of the injection and the viscosity of the resin to reduce and eliminate the bubble of the production.The result can guide the practice production.4. The properties testing of the main insulative board of the light railFirstly, we test the insulation, drainage, anti-aging properties of the specimens。And we also explain the process of the production,Finally we preheating the molding specimen,This will effectively eliminate the bubble in the number of products, improve the insulation of electric insulation properties.Then to have a experiment and testing on the hydrophobic properties of insulation and anti-aging properties , results showed that the modified outer coating has good drainage and aging resistance,The results showed that modified outer coating has good drainage and aging resistance。Finally,to test the mechanical properties,and we got the best amount of epoxy resin through experiments.observed the fiber distribution of the sample section , The results have a direction to the actual production5. The molding technics of the main insulative boardAnalysis of the test results, we can determine the best conditions Process,so we get a good technical requirements of product。And it is used in reality。...