Carbon fiber-reinforced composite materials have excellent physical and mechanical properties. As a hood cover material, they can achieve weight reduction under the premise of ensuring rigidity requirements. Some domestic OEMs have carried out research and development of automobile carbon fiber engine covers.
The vacuum infusion molding process is to lay the car carbon fiber reinforced material directly on the mold, and lay a release layer on the fiber reinforced material. The release layer is usually a very thin fiber fabric with low porosity and low permeability, and the release layer Place a high-permeability medium on top, then cover and seal with a vacuum film. The resin enters the entire system through the inlet hose, guides the main direction of resin flow through the diversion pipe, and peels off the release cloth after curing, thereby obtaining a laminate structure with high density and low glue content.
Process characteristics
Good environmental protection: Because the entire tooling system is closed, there are very few organic volatiles during the molding process, which improves the working environment and the process is simple.
High quality stability, high strength and simple process: Vacuum assist can fully eliminate bubbles, reduce the void ratio of the product, can effectively control the content of the product, the product has high quality stability, good reproducibility, and the apparent quality of the product . The layer is the same, the thickness is thin, the strength is high, and the tensile strength is increased by more than 20% relative to the hand layup molding. This process does not have high requirements for molds, and mold making is relatively simple.
Low cost: Compared with the traditional process, its mold cost can be reduced by 50 to 70%. Vacuum infusion molding process has strict requirements on resin viscosity, generally the viscosity is controlled below 300cps. The selected resin should have better mechanical properties, corrosion resistance and less curing shrinkage. Reinforced materials require low flow resistance to resin, good wettability, high mechanical strength, and good spreadability (reinforced materials can be easily made into the same shape and uniform quality as the work without wrinkles, breaks, or tears) is good.