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Resin transfer molding (RTM) method for composite blade

A molding method and composite material technology, applied in the field of resin matrix composite material liquid molding, can solve the problems of less structural interweaving points, structural stability, prefabricated body slip, blade structural deformation, etc. The degree of displacement and the effect of increasing the injection speed

Active Publication Date: 2019-02-05
AVIC COMPOSITES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the positioning method of the preform in the mold has been disclosed through the application number CN201711345855.8. However, due to the structural complexity of the composite fan blade, before the mold is closed, even if the preform and the mold are positioned, the preform and the mold The profile cannot be fully fitted in place; at the same time, due to the limitation of the weaving process, the thickness of the blade weaving prefabricated body is different from the theoretical thickness of the blade, which is usually thicker than the theoretical thickness. Surface secondary bonding and compaction phenomenon
Therefore, during the mold closing process, the secondary bonding between the preform and the smooth mold surface and the structural deformation caused by the local compaction of the preform will cause the preform to slip during the mold closing process, resulting in post-molding The position of the weaving structure of the blade does not match the theoretical position, resulting in the scrapping of parts
In addition, due to the complexity of the blade structure, there are different partitions in the internal structure of the braided blade, and some structures have fewer interweaving points and the structural stability is not good enough, which leads to the erosion deformation caused by the pressure during resin injection, resulting in the structural deformation of the blade after molding Third, during the injection process, due to the gap between the blade preform and the edge of the mold, the edge area of ​​the blade is very easy to form a fast resin flow path, resulting in defects in the blade injection, resulting in scrapped parts

Method used

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  • Resin transfer molding (RTM) method for composite blade
  • Resin transfer molding (RTM) method for composite blade
  • Resin transfer molding (RTM) method for composite blade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The blade prefabricated body 10 is a variable thickness 2.5D woven structure fan blade prefabricated body, the material is CCF800, and the fiber volume content of the material is 55%±3%; CCF800 is a T800 grade carbon fiber fabric with a specification of 12K produced by Shandong Weihai Development Company , the injection resin adopts PR520 high-toughness liquid molding resin from CYTEC Company. The external dimensions of the blade body 1 are: 750mm×300mm (length×width), and the external dimensions of the blade prefabricated body are 800mm×340mm (length×width). There is a margin of 20mm around the body. The specific molding steps are as follows:

[0056] 1) The blade 1 is composed of a blade body 11 and a blade margin area 12, the blade margin area 12 is composed of a blade tenon margin area 13 and a blade edge margin area 14, and the blade prefabricated body 10 is an intermediate body of the blade 1 before RTM molding;

[0057] 2) The molding die 4 is processed from a P2...

Embodiment 2

[0068] The blade prefabricated body 10 is a variable thickness 2.5D woven structure fan blade prefabricated body, the material is T700, and the fiber volume content of the material is 58% ± 3%; T700 is a T700 grade carbon fiber fabric with a specification of 12K produced by Toray Corporation of Japan The resin used for injection is ACTECH1304 high-toughness liquid molding resin of AVIC Composites Co., Ltd. The overall dimensions of the blade body 1 are: 720mm×260mm (length×width), and the overall dimensions of the blade preform are 780mm×320mm (length×width) ), leaving a margin of 30mm around the blade prefabricated body, the specific forming steps are as follows:

[0069] 1) The blade 1 is composed of a blade body 11 and a blade margin area 12, the blade margin area 12 is composed of a blade tenon margin area 13 and a blade edge margin area 14, and the blade prefabricated body 10 is an intermediate body of the blade 1 before RTM molding;

[0070] 2) The molding die 4 is proce...

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Abstract

The invention belongs to a liquid molding technology of resin matrix composites and relates to a resin transfer molding (RTM) method for a composite blade. According to the RTM method, by adjusting the compacted amounts, of a blade perform, in the margin areas of an upper half mold and a lower half mold, the compacted amounts are allowed to be higher than the compacted amounts, of the blade preform, in the molding area of the upper half mold and the lower half mold to increase the compaction degree, of the blade preform, in a peripheral margin area, so as to prevent the blade preform from moving in the mold closing process and increase the qualification rate of the braided composite blade molded by RTM; by adjusting the surface roughness degrees of the margin areas, of the upper half moldand the lower half mold, for blade molding, the surface roughness degrees are allowed to be higher than the roughness degrees of the molding areas of the upper half mold and the lower half mold to improve the capacity of preventing displacement of the blade preform in the peripheral margin area, so as to prevent the blade preform from moving during the mold closing process; and by increasing the numbers of surface bulges in the margin areas, of the upper half mold and the lower half mold, for blade molding, the capacity of preventing displacement of the blade preform is further improved, so asto fully ensure that the blade preform is prevented from moving in the mold closing process.

Description

technical field [0001] The invention belongs to the resin-based composite material liquid forming technology, and relates to an RTM forming method of a composite material blade. Background technique [0002] Modern turbofan aero-engines are constantly developing towards high bypass ratio, high thrust, low fuel consumption, low noise, high safety and high reliability. In order to increase the bypass ratio of the engine, it is necessary to use larger fan blades, which makes the weight of the fan section of the engine account for an increasing proportion of the total weight of the engine. Fan blades made of traditional titanium alloy materials have gradually been unable to meet the performance requirements of modern high-performance turbofan engines with large bypass ratios. Therefore, reducing the weight of fan blades has become one of the key problems that must be solved in the development of high performance engines. Resin-based composite materials have excellent character...

Claims

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Application Information

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IPC IPC(8): B29C70/48B29C70/54
CPCB29C70/48B29C70/54
Inventor 刘强黄峰马金瑞赵龙
Owner AVIC COMPOSITES
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