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Mold for improving internal quality of liquid forming composite material and control method

A technology of liquid molding and composite materials, which is applied in the direction of weight reduction, and can solve problems such as complicated operation and difficult control of the reaction process

Active Publication Date: 2021-09-14
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention improves the resin injection molding period from the perspective of resin reaction, but the operation is complicated and the reaction process is not easy to control

Method used

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  • Mold for improving internal quality of liquid forming composite material and control method
  • Mold for improving internal quality of liquid forming composite material and control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Preparation of carbon fiber preform

[0037] First of all, a liquid forming composite material mold with a size of 700*600*2mm composite material plate is selected, and the volume of the glue storage tank 5 is designed to be 100*50*4mm. Clean up the resin and sealing material, and then apply a high-temperature release agent evenly on the mold surface. Reinforcement blanking adopts manual blanking method, and the release paper is placed on the operating table flatly, and then the surface density is 222g / m 2 1. Place the carbon fiber unidirectional cord fabric with a thickness of 0.24mm flat on the release paper, use a triangle ruler and a ruler to correct the angle of the cord fabric, and cut out 8 layers of cord fabric with a width of 700*600mm. After the release agent is fully dried, the cut 8-layer unidirectional cord fabric is laid layer by layer, and compacted with an electric iron to form a carbon fiber prefabricated body.

[0038] 2. Clamping and heating

[...

Embodiment 2

[0048] 1. Preparation of carbon fiber preform

[0049] First, select a liquid molding composite material mold with a size of 700*600*4mm composite material plate, and design the size of the rubber storage tank 5 to be 100*50*6mm. Clean up the resin and sealing material, and then apply a high-temperature release agent evenly on the mold surface. Reinforcement blanking adopts manual blanking method, and the release paper is placed on the operating table flatly, and then the surface density is 222g / m 2 , Carbon fiber unidirectional cord fabric with a thickness of 0.24mm is placed flat on the release paper, use a triangle ruler and a ruler to correct the angle of the cord fabric, and follow [45 / 0 / -45 / 90] 2s 16 layers of cord fabrics with corresponding angles are cut from the layup. After the release agent is fully dried, the cut 16 layers of unidirectional cord fabric are laid layer by layer according to the laying order, and are compacted and shaped with an electric iron to for...

Embodiment 3

[0060] 1. Preparation of carbon fiber preform

[0061] First of all, a liquid forming composite material mold with a size of 700*600*2mm composite material board is selected, and the size of the rubber storage tank 5 is designed to be 100*50*4mm. Clean up the resin and sealing material, and then apply a high-temperature release agent evenly on the mold surface. Reinforcement blanking adopts manual blanking method, and the release paper is placed on the operating table flatly, and then the surface density is 222g / m 2 , Carbon fiber unidirectional cord fabric with a thickness of 0.24mm is placed flat on the release paper, use a triangle ruler and a ruler to correct the angle of the cord fabric, and follow [45 / -45] 2s Lay up and cut out 8 layers of cord fabrics with corresponding angles. After the release agent is fully dried, the cut 8-layer unidirectional cord fabric is laid layer by layer according to the laying order, and compacted with an electric iron to form a carbon fib...

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Abstract

The invention belongs to the field of composite material liquid forming, and relates to a mold for improving the internal quality of a liquid forming composite material and a control method. A glue storage groove is additionally formed in the inner side of a glue outlet of a liquid forming mold, a mold cavity is firstly filled with resin during resin injection, then the resin is injected into the glue storage groove, and then glue is discharged through the glue outlet; a reverse pressing method is adopted, and reverse air pressure is applied from the glue outlet of the glue storage groove in the curing process, so that resin in the glue storage groove flows reversely, the reduced resin volume in the mold cavity is supplemented, the resin content in the mold cavity is increased, and defects such as pores are reduced. The liquid forming composite material prepared by the invention has good internal quality and low porosity, has great technical advantages for improving the mechanical properties of composite material flat plates and workpieces, and has important significance for the application of novel resin-based composite materials for aerospace.

Description

technical field [0001] The invention belongs to the field of liquid molding of composite materials, and relates to a mold for improving the internal quality of liquid molding composite materials and a control method. Background technique [0002] Composite materials have high specific strength, high specific stiffness, anti-fatigue, anti-corrosion and other characteristics. They are widely used in new civil and military aircraft and aviation equipment. They can greatly reduce the structural quality of the airframe and improve the overall performance of the aircraft. Lightweight, stealth, high performance and miniaturization play a vital role. [0003] Based on the reaction characteristics of advanced composite materials and the specific requirements to meet the internal quality of advanced composite material components, the internal structure and mechanical properties of liquid-formed composite material plates and parts should meet the design requirements. After the compone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/48B29C70/54
CPCB29C70/48B29C70/54Y02T50/40
Inventor 张代军雷帅付善龙刘燕峰李军
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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