Study On The Key Technique Of The Resin Transfer Molding For Automobile Bumper

Resin transfer molding developed rapidly these years, which is a composite material liquid molding technology, and it is the most important techniques for fiber reinforced plastics. In the process, resin is injected into the closed mold and infiltrate the reinforce materials, 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) Product takes off from the mold. When the resin is solidified, opening the mold and getting the part. Comparing with other processing for composite, there are many advantages in RTM. 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 automobile bumper RTM process, the molding theory, numerical simulation analyses, mold design, technological design are researched.1. Study on the rheology theory for RTMThe resin filling process of RTM is analyzed, including the preparing phase, resin flow phase and resin solidify phase. Some measure means and measure equipments 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. Study on numerical simulation of RTM filling process for automobile bumper.