L-RTM (Light-Resin Transfer Moulding) manufacture technology for glass fiber reinforced plastics wind power engine room cover

Abstract

The invention discloses an L-RTM (Light-Resin Transfer Moulding) manufacture technology for a glass fiber reinforced plastics wind power engine room cover, comprising the following steps of: processing a die; laying a prefabticated member; assembling dies and sealing; vacuumizing a die cavity; injecting resin; demoulding; and trimming; in the step of assembling dies and sealing, arranging an annular sealing cavity which is used for assembling dies and sealing the die cavity; assembling dies by a negative-pressure system to judge whether the die cavity is sealed according to the pressure situation of the annular sealing cavity and the die cavity; and in the step of injecting resin, ensuring that the discharge hole of a resin container is higher than the injection port of the die. The L-RTM manufacture technology for a glass fiber reinforced plastics wind power engine room cover is characterized in that die control, trouble shooting and resin filling technology are perfected on the basis of the common L-RTM technical theory; the automation degree is high, the die trouble shooting is easy to implement, production efficiency and product quality can be improved, and the labor intensity of workers is lowered; the resin filling step is finished by that resin flows into the die cavity under the action of self weight and vacuum negative pressure, a high-pressure injection machine is not required, energy is saved, major cost for purchasing and maintaining the high-pressure injection machine is saved, and cost is lowered.

Description

technical field [0001] The invention relates to a manufacturing process for producing a fiberglass wind turbine cover, in particular to an L-RTM manufacturing process. Background technique [0002] As the main part of FRP for wind turbines, the manufacture of FRP wind turbine canopy is more commonly used open hand lay-up molding process or L-RTM (light resin transfer molding) derived from the traditional RTM (resin transfer molding) manufacturing process. Molding) manufacturing process, in which the open hand lay-up process is a process in which glass fiber fabrics and resins are alternately laid on the mold by hand, and then solidified and formed. The equipment is simple, the investment is small, and the forming is not limited by the size and shape of the product. , but the disadvantages of using this method for production are low efficiency, long production cycle, not suitable for mass production, product quality is not easy to control, product performance stability is poo...

AI Technical Summary

Problems solved by technology

[0002] As the main part of FRP for wind turbines, the manufacture of FRP wind turbine canopy is more commonly used open hand lay-up molding process or L-RTM (light resin transfer molding) derived from the traditional RTM (resin transfer molding) manufacturing process. Molding) manufacturing process, in which the open hand lay-up process is a process in which glass fiber fabrics and resins are alternately laid on the mold by hand, and then solidified and formed. The equipment is simple, the investment is small, and the forming is not limited by the size and shape of the product. , but the disadvantages of using this method for production are low efficiency, long production cycle, not suitable for mass production, product quality is not easy to control, product performance stability is poor, and the production environment is poor, smelly, dusty, easy to cause construction personnel Injury, and the L-RTM manufacturing process is a process method that combines a vacuum negative pressure system to inject resin into a closed mold to infiltrate the reinforcement material and cure it. The worker only needs to put the designed fiber preform into the mold and close the mold. The subsequent process is completely completed and guaranteed by the mold and injection system, with high degree of automation, high production efficiency, stable product quality, no resin exposure during the production process, friendly working environment, low labor intensity of workers, and no impact on the technology and environment of workers. The requirements are far lower than the hand lay-up process and can effectively control the product quality, and the quality of the inner and outer surfaces of the manufactured products is good. Therefore, the L-RTM manufacturing process has gradually replaced the open hand lay-up molding process for FRP products due to its above advantages. However, in the usual L-RTM manufacturing process, the upper mold and the lower mold are tightly sealed by bolts, which not only increases the weight of the mold, but also requires a lot of time and manpower to operate, and there is no system for leak detection , The perfect technical solution hinders the production to some extent, and the resin infusion process needs to use multiple resin injection machines to complete, the energy consumption is high, and the cost of purchasing and maintaining resin injection machines is high

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