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Forming process of curved composite tube

A composite material pipe and molding process technology, which is applied in the direction of tubular articles, other household appliances, household appliances, etc., can solve problems such as research and application reports of composite material pipes that have not seen curves, achieve good structural quality efficiency, and meet dimensional accuracy requirements. , the effect of convenient operation

Active Publication Date: 2012-01-18
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are no research and application reports on curved composite material pipes in domestic literature

Method used

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  • Forming process of curved composite tube
  • Forming process of curved composite tube
  • Forming process of curved composite tube

Examples

Experimental program
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preparation example Construction

[0052] The preparation method of carbon fiber composite material is given below, which can be designed according to the specific product performance and structure in actual production, and its specific performance and index are different according to different prepregs and different preparation methods.

[0053] The carbon fiber material is impregnated with a certain amount of resin glue to make a dry-process resin-based composite material prepreg. The reinforcement material is carbon fiber, and the resin matrix is ​​epoxy resin.

[0054] The resin system is epoxy resin, which is made into dry or wet resin-based composite material prepreg, in which the mass of wet prepreg resin accounts for 40%-46% of the total mass of the mixture; the mass of dry prepreg resin accounts for the mixture 32%-38% of the total mass.

[0055] The quality index requirements of composite material wet prepreg are shown in Table 1.

[0056] Table 1 Quality index of composite material wet prepreg

[...

Embodiment 1

[0079] Product Name: Radial Ribs for Reflective Surfaces

[0080] Size: focal length 1400mm, length 1600mm

[0081] The implementation steps are as follows:

[0082] (1) The mold is designed as a closed, combined hard mold and silicone rubber soft mold, and the product molding pressure is 0.5MPa.

[0083] (2) Cast the silicone rubber soft mold and perform post-treatment in an oven. The heating rate is 20°C-40°C / h, the post-treatment temperature is 180±5°C, and the post-treatment time is 3h. After cooling down to room temperature with the furnace, the post-treatment is completed.

[0084] (3) The glue content of the dry prepreg is 35±3%, the volatile matter is controlled within 1%, and the surface density of the prepreg is 165±5g / m 2 , thickness 0.15mm, width 800mm.

[0085] (4) Use an automatic cutting machine for cutting.

[0086] (5) Lay multiple layers of carbon fiber prepregs on the forming mold to form a laminate of composite prepregs.

[0087] (6) Autoclave forming:...

Embodiment 2

[0090] Product Name: Radial Ribs for Reflective Surfaces

[0091] Size: focal length 1400mm, length 1600mm

[0092] The implementation steps are as follows:

[0093] (1) The mold is designed as a closed, combined hard mold and silicone rubber soft mold, and the product molding pressure is 0.3MPa.

[0094] (2) Cast the silicone rubber soft mold and perform post-treatment in an oven. The heating rate is 20°C-40°C / h, the post-treatment temperature is 180±5°C, and the post-treatment time is 3h. After cooling down to room temperature with the furnace, the post-treatment is completed.

[0095] (3) The glue content of the dry prepreg is 35±3%, the volatile matter is controlled within 1%, and the surface density of the prepreg is 165±5g / m 2 , thickness 0.15mm, width 800mm.

[0096] (4) Use an automatic cutting machine for cutting.

[0097] (5) Lay multiple layers of carbon fiber prepregs on the forming mold to form a laminate of composite prepregs.

[0098] (6) Molding in an oven...

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Abstract

The invention provides a forming process of a curved composite tube. The forming process comprises the following steps of: manufacturing a forming die; preparing prepregs; laying up the prepregs; assembling the die; curing; and de-molding. The forming process has the beneficial effects that a closed and combined hard die is utilized as the forming die, a silicon rubber flexible die is utilized asthe inner cavity of the curved composite tube, and the size of the silicon rubber flexible die is determined by means of the forming pressure and the swelling property of silicon rubber, which solvesthe difficulties of the curved composite tube such as difficult de-molding process and difficult control of the cavity size of the product and ensures that the size of the inner cavity meets the requirements after the formed product is smoothly de-molded; the integral informing technology is adopted so as to solve the difficulties of extension positions at two sides of the curved composite tube such as difficult pressurization, difficult control of overall quality and the like, thus achieving the purpose of one-time forming of the product and meeting the requirements for dimensional precision; and by means of layering design and forming process control of a composite material, the problem of easiness in deformation of the formed curved composite tube is solved so as to meet the requirements for accuracy control of the product. The curved composite tube formed by the forming process has the advantages of better structural quality, higher performance, higher dimensional precision and higher curvature forming precision.

Description

technical field [0001] The invention relates to a molding process of a curved composite material pipe, and belongs to the technical field of resin-based structural composite material processing. Background technique [0002] At present, aerospace structural composite materials have entered a stage of rapid development, and new models have put forward higher requirements for structural weight reduction and high efficiency. Composite materials are one of the important means to realize these key technologies. The overall molding technology of composite materials is one of the key manufacturing technologies in the field of aerospace composite materials in the world. The overall molding manufacturing technology can give full play to the designability of composite materials, integrate the parts of some components as a whole, and improve the structural integrity. functions to meet the requirements of weight reduction and high efficiency. [0003] Overseas composite material moldin...

Claims

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Application Information

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IPC IPC(8): B29C70/34B29C70/54B29C33/38B29L23/00
Inventor 赵锐霞蒋文革何云华赵明
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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