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C-shaped-cross-section composite bistable-state shell structure and forming mold

A technology of composite materials and forming molds, which is applied in the field of composite materials processing, can solve the problems of unable to form the edge area of ​​C-shaped cross-section structure, high pressure of air bag, etc., and achieve the effect of low cost, improved product quality and high quality

Active Publication Date: 2018-08-17
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the non-cross-section convoluted closed body with C-shaped cross-section structure, due to the high pressure of the air bag, it is impossible to form the edge area of ​​​​the C-shaped cross-section structure.

Method used

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  • C-shaped-cross-section composite bistable-state shell structure and forming mold
  • C-shaped-cross-section composite bistable-state shell structure and forming mold
  • C-shaped-cross-section composite bistable-state shell structure and forming mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Glass fiber non-weft cloth / epoxy resin prepreg is used as the material of the C-shaped structure, and the prepreg is laid and molded according to the design. The airbag is inflated and pressurized, and the pressure is controlled at 0.02-0.1bar, and then the prepreg layer is laid on the outer surface of the airbag, and then loaded into the female mold, and the mold is fastened. Gradually heat up to the softening point of the resin, generally at 30-80°C, during which the airbag pressure remains unchanged. After reaching the softening point temperature, continue to pressurize the airbag, increase the pressure to 0.05-0.3bar, maintain it for 5 minutes, release the pressure to the initial pressure, and then pressurize to 0.05-0.3bar. After repeating the above pressurization process 2-5 times, maintain the pressure at 0.1-0.5 bar, and raise the temperature to 130°C, keep the temperature for 120 minutes, then lower the temperature to 80°C, and demould.

Embodiment 2

[0032]Glass fiber non-woven fabric / PA66 prepreg is used as the material of the C-shaped structure, and the prepreg is laid and molded according to the design. The airbag is inflated and pressurized, and the pressure is controlled at 0.02-0.1bar, and then the prepreg layer is laid on the outer surface of the airbag, and then loaded into the female mold, and the mold is fastened. Gradually heat up to the softening point of the resin, generally at 160°C, during which the airbag pressure remains unchanged. After reaching the softening point temperature, continue to pressurize the airbag, increase the pressure to 0.05-0.3bar, maintain it for 5 minutes, release the pressure to the initial pressure, and then pressurize to 0.05-0.3bar. After repeating the above pressurization process 2-5 times, start to raise the pressure to 0.1-0.5 bar, then raise the temperature to 130°C, keep the temperature for 15 minutes, then lower the temperature to below 60°C, and demould.

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Abstract

The invention provides a C-shaped-cross-section composite bistable-state shell structure and a forming mold. The forming mold is composed of an airbag and a female mold; the female mold is composed ofan upper female mold body and a lower female mold body; the cross section molded surface contour line of the upper female mold body is composed of a first arc molded line, a second arc molded line, athird arc molded line, a fourth arc molded line and a fifth arc molded line in a smooth transition mode; the second arc molded line, the third arc molded line and the fourth arc molded line form a symmetrical arc concave structure; and the second arc molded line and the fourth arc molded line are symmetrically distributed on the two sides of the third arc molded line to form a semicircle. According to the C-shaped-cross-section composite bistable-state shell structure and the forming mold, by conducting improvement design on the mold structure, the quality problem that the edge zone is irregular due to the fact that the edge of the C-shaped-cross-section composite bistable-state shell structure is squeezed is solved.

Description

technical field [0001] The invention relates to a bistable shell structure of a C-shaped cross-section composite material and a molding die, belonging to the technical field of composite material processing. Background technique [0002] The bistable bistable shell structure of composite materials with C-shaped cross-section that can be curled and stabilized in both directions is a composite shell structure that can be curled and stabilized in both directions. The bistable structure is mainly based on the shell structure, which refers to the states that can maintain stable bending deformation along the two directions along the surface of the shell structure at different times. There are two ways to realize the bistable structure: one is to use shell structures with different bending directions to superimpose layer by layer to form an overall shell structure, and the shell structures with different bending directions can affect the combined shell structure in their respective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/34B29C33/42B29C70/54
CPCB29C33/42B29C70/342B29C70/54
Inventor 张辰威
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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