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A preparation method of thin-walled curved pipe fittings made of carbon fiber composite materials

A composite material and carbon fiber technology, which is applied in the field of preparation of thin-walled curved pipe fittings of carbon fiber composite material, can solve the problems of variable cross-section production difficulty, rough outer surface, difficult process, etc., and achieves strong controllability of product morphology and surface state. Smooth and good mechanical properties

Active Publication Date: 2018-01-16
XIAN KANGBEN MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the thin-walled carbon fiber composite curved tube, due to the complexity of its structure, it is difficult to demould and prone to delamination if the traditional rolling tube method is used; while the molding process using the fiber winding method is very difficult, it is not It is easy to prepare large-size pipe fittings with continuous lengths, and the products have low axial tensile strength, rough outer surface, and easy leakage; although the pultrusion method can theoretically continuously prepare composite material profile products with unlimited lengths, but in There are still great difficulties in improving the hoop mechanical properties and traction control of large-sized thin-walled pipe fittings, and it is also quite difficult to realize variable cross-section production

Method used

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  • A preparation method of thin-walled curved pipe fittings made of carbon fiber composite materials

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The shape of the carbon fiber composite thin-walled curved pipe to be prepared in this embodiment is arc-shaped, with an outer diameter of 22 mm, a wall thickness of 1.0 mm, and a chord length of 3.0 m. The diameter of the foam mandrel 2 selected in this embodiment is 17mm, and the inner diameter of the selected steel outer mold 3 is 22mm. to combine figure 1 , the preparation method of the carbon fiber composite material thin-walled curved pipe fitting in this embodiment includes the following steps:

[0026] Step 1. Put the foam mandrel 2 into the air bag 4, then connect the air bag 4 to the vacuum pump, and then turn on the vacuum pump to vacuumize the air bag 4 until the air bag 4 is tightly wrapped on the foam mandrel 2 outside;

[0027] Step 2, uniformly wrap the prepreg 1 on the outside of the air bag 4 tightly covered with the foam mandrel 2 in the step 1; the prepreg 1 is a unidirectional carbon fiber / epoxy resin prepreg, and the prepreg The areal density of...

Embodiment 2

[0031] The shape of the carbon fiber composite thin-walled curved pipe to be prepared in this embodiment is arc-shaped, with an outer diameter of 22 mm, a wall thickness of 1.5 mm, and a chord length of 3.0 m. The diameter of the foam mandrel 2 selected in this embodiment is 16mm, and the inner diameter of the selected steel outer mold 3 is 22mm. to combine figure 1 , the preparation method of the carbon fiber composite material thin-walled curved pipe fitting in this embodiment includes the following steps:

[0032] Step 1. Put the foam mandrel 2 into the air bag 4, then connect the air bag 4 to the vacuum pump, and then turn on the vacuum pump to vacuumize the air bag 4 until the air bag 4 is tightly wrapped on the foam mandrel 2 outside;

[0033] Step 2, uniformly wrap the prepreg 1 on the outside of the air bag 4 equipped with the foam mandrel 2 in step 1; the prepreg 1 includes unidirectional carbon fiber / epoxy resin prepreg and carbon fiber woven cloth / ring Oxygen res...

Embodiment 3

[0037] The shape of the carbon fiber composite thin-walled curved pipe to be prepared in this embodiment is arc-shaped, with an outer diameter of 50 mm, a wall thickness of 2 mm, and a chord length of 8.0 m. The diameter of the foam mandrel 2 selected in this embodiment is 42mm, and the inner diameter of the selected steel outer mold 3 is 50mm. combine figure 1 , the preparation method of the carbon fiber composite material thin-walled curved pipe fitting in this embodiment includes the following steps:

[0038] Step 1. Put the foam mandrel 2 into the air bag 4, then connect the air bag 4 to the vacuum pump, and then turn on the vacuum pump to vacuumize the air bag 4 until the air bag 4 is tightly wrapped on the foam mandrel 2 outside;

[0039] Step 2, uniformly wrap the prepreg 1 on the outside of the air bag 4 equipped with the foam mandrel 2 in the step 1; the prepreg 1 includes unidirectional carbon fiber / epoxy resin prepreg and carbon fiber woven cloth / ring Oxygen resi...

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Abstract

The invention provides a preparing method of a carbon fiber composite thin-wall curve pipe. The method comprises the following steps that firstly, a foam core die is placed in an air bag, and the air bag is vacuumized through a vacuum pump till the foam core die is closely wrapped by the air bag; secondly, the air bag is evenly wrapped by prepreg; and thirdly, the prepreg is placed in a steel outer die, the steel outer die is placed in an oven to be heated, in the heating process, the air bag is inflated with compressed air through an air compressor, the prepreg is cured, deflation and die stripping are carried out after curing is finished, and the carbon fiber composite thin-wall curve pipe is obtained. The inner shape face of a product is controlled through the foam core die, the outer shape face of the product is controlled through the steel outer die, and the product has the beneficial effects that the appearance of the product is high in controllability, the surface state is smooth and clean, the mechanical performance is good, and the product is simple and economical; and the preparing method is suitable for forming of curve pipe products with the continuous length and large size.

Description

technical field [0001] The invention belongs to the technical field of carbon fiber composite material product molding, and in particular relates to a method for preparing a thin-walled curved pipe fitting of carbon fiber composite material. Background technique [0002] Carbon fiber composite material (CFRP) has excellent mechanical and physical properties, and is an important structural material used in aviation, aerospace, weapons, electronics and other fields. Lightweight, high strength, corrosion resistance and many other excellent properties, it is a commonly used structural component in aviation and spacecraft structures. [0003] Commonly used methods for forming traditional carbon fiber composite pipe fittings include rolling tube method, fiber winding method, pultrusion method and other forming processes. For the thin-walled carbon fiber composite curved tube, due to the complexity of its structure, it is difficult to demould and prone to delamination if the tradi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C70/34B29C70/54
CPCB29C70/342B29C70/54
Inventor 韩笑王希杰卢彬王增加刘建军赵华民
Owner XIAN KANGBEN MATERIAL