Filling molding method of large-thickness area composite product

Abstract

The invention relates to a pouring filling method of a large-thickness area composite product, which is suitable for filling molding of a large-thickness composite product, and aims at solving the problems in a vacuum assisted filling molding process of a wind blade product. A supporting platform (5) and an isolation plate (4) are additionally arranged in the molding process to avoid the contact between a filling pipe (6) and a composite material reinforced fabric laying layer (1), so that the primary flow rate of resin in the filling process is reduced, the resin is prevented from entering the reinforced fabric in an impact way, the adequate time for infiltration between the resin and the reinforced fabric can be guaranteed, and the probability of unfavorable infiltration and insufficient rubber content can be reduced. A guide medium (8) strong in dispersion property is laid on the surface of the composite material reinforced fabric layer (1) to form a stripping layer (2), so that bubbles separated out from the resin through the supporting platform (5) and the isolation plate (4) can be collected and can be further reduced to be easy to pump, and a purpose of overcoming the filling blushing weakness of a product can be fulfilled.

Description

technical field [0001] The invention belongs to the technical field of vacuum-assisted infusion molding of composite materials, and mainly relates to a method for infusion molding of composite material products in a large thickness area. Background technique [0002] Among the many molding processes of composite materials, the vacuum-assisted infusion molding process is adopted by the manufacture of wind power blade products because of its low mold investment cost, less restrictions on product dimensions, and the ability to manufacture large components. At present, the main process of the vacuum-assisted infusion molding process of composite materials is: 1. Pre-lay the reinforcing fabric——glass fiber cloth on the mold; 3. Use the vacuum pump to make the whole system in a vacuum negative pressure state, and then introduce the resin to complete the infusion and curing molding. The above-mentioned composite material vacuum-assisted infusion molding process is successful for g...

AI Technical Summary

Problems solved by technology

The analysis results show that when the composite material is poured, there may be whitening defects on the surface of the product due to pores, poor resin infiltration, bubble accumulation and insufficient glue content inside the product.

The existence of this kind of defect will reduce the strength and fatigue performance of the product, especially for wind turbine blades with large thickness composite material structure, the glass fiber cloth reinforced fabric layer at the blade root is more than 100 layers, and the root of the wind turbine blade is used as rigidity. The main load-bearing parts of the connection are subjected to long-term action of cyclical alternating loads, and the existence of perfusion whitening defects will directly affect the service life of wind turbine blades and cause safety hazards

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