RTM forming mold and method of composite blade

Abstract

The invention belongs to the resin-based composite liquid forming technology, in particular to an RTM forming mold and method of a composite blade. Due to the high performance requirement of the composite blade, high-toughness liquid forming resin must be adopted, the phenomenon that temperature changes are too large to exceed the range is prone to being generated in the long-distance flowing process, and forming failures are extremely prone to being caused by uneven resin temperatures and uneven resin flowing distribution. A glue inlet slow flowing area communicating with a glue inlet is arranged on the forming mold, a resin diffusion device is arranged between the glue inlet slow flowing area and an inner cavity of a blade prefabricated body, and a flue outlet slow flowing area communicating with a glue outlet is further arranged. It can be ensured that resin can form the blade prefabricated body within the required temperature range, the problem that the glue inlet quantity of a traditional RTM process cannot be controlled in a zoned manner is effectively solved, the fringe effect phenomenon existing in the conventional RTM process is weakened, and the forming quality of the composite blade is further improved.

Description

technical field [0001] The invention belongs to the resin-based composite material liquid forming technology, and in particular relates to a composite material blade RTM forming mold and method. Background technique [0002] Carbon fiber reinforced resin-based composite materials have unique advantages such as light weight, high specific strength, high specific modulus, good fatigue fracture resistance, corrosion resistance, and easy large-area integral forming. The amount of key materials used in equipment has also become one of the symbols of the advanced nature of aviation equipment. [0003] Composite material blades are widely used in aero-engines with high-precision composite parts. Composite material blades directly affect the aerodynamic performance and noise indicators of the engine. The aerodynamic force of the blade, the fatigue load caused by the vibration of the blade, and the impact of foreign objects such as sand, stones, and birds have extremely high require...

AI Technical Summary

Problems solved by technology

[0005] However, due to the high-performance requirements of composite blades, high-toughness liquid molding resins must be used, such as Hexcel’s RTM230ST or Cytec’s PR520. This type of resin is characterized by good impact toughness, but the disadvantage is that the effective injection period is extremely short (within 35 minutes), and the injection temperature is high (165-170°C), the injection temperature range is extremely small (5°C), the RTM process is strictly controlled, and the resin is prone to excessive temperature changes during the long-distance flow of the injection machine-pipeline-mold. In addition, because the composite material blade has a structure with large variable thickness and variable cross-section, and the blade is a structure with a thick middle and thin sides, the flow of resin in the blade prefabricated body is complicated, and uneven flow distribution is easily generated. Increased the difficulty of RTM molding

Therefore, when using high-toughness resin for RTM molding of composite blades, it is very easy to cause molding failure due to uneven resin temperature and uneven resin flow distribution.

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