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Device for testing condition for forming pore bugs in hyperpressure forming process, and method for eliminating pores

A technology of thermoforming and condition testing, which is applied in the field of testing devices for pore formation conditions of resin-based composite materials in the process of thermoforming, and can solve the problems of complex pore formation process, long development cycle, and lack of theoretical and experimental methods, etc. To achieve the effect of true and reliable measurement data, comparable and low experimental cost

Inactive Publication Date: 2010-08-11
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many factors affecting the pore defects, not only related to the physical / chemical properties of the resin, the type and content of volatile matter, the network structure of the fiber layer, but also affected by the flow of the resin and the compaction process of the fiber. These factors are affected by the temperature and pressure The pore formation process is very complicated and difficult to observe, so there are no mature theoretical and experimental methods to predict the formation of pore defects or eliminate pore defects
At present, in engineering practice, the process conditions are mainly determined by the trial-and-error method based on experience and a large number of experiments. It is difficult to guarantee the quality of the produced composite materials. Good process conditions, once the material system or the structure of the part is changed, the original process conditions will not be applicable and need to be explored again, not only the development cycle is long, but also the universality is poor and the cost is high, so this method is difficult to really solve the porosity defect problem

Method used

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  • Device for testing condition for forming pore bugs in hyperpressure forming process, and method for eliminating pores
  • Device for testing condition for forming pore bugs in hyperpressure forming process, and method for eliminating pores
  • Device for testing condition for forming pore bugs in hyperpressure forming process, and method for eliminating pores

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1. Sample preparation

[0048] The prepreg is selected as S-2 glass fiber / epoxy BA9916 system.

[0049] Cut the selected prepreg according to the inner diameter of the heating cavity 2, then spread 30 layers of prepreg in the heating cavity 2 to form a laminate, and then cover the vent sheet 3; A sealing gasket 7 with a hole in the middle is placed on the upper end surface, and a vacuum nozzle 6 is placed on the sealing gasket 7. One end of the vacuum nozzle 6 is connected to a vacuum pump 9 through a vacuum tube 8; use a temperature controller 10 to heat the laminate to 50°C, and open it at the same time Vacuum pump 9; the air in the laminated body is discharged through the through hole on the exhaust sheet 3; the vacuum pump 9 draws the vacuum degree in the heating mold cavity 2 to 95KPa and closes the vacuum pump 9, takes off the vacuum pumping device, stops heating, and obtains a sample Sample 4;

[0050] 2. Sample curing under different temperature and pressure c...

Embodiment 2

[0061] 1. Sample preparation

[0062] The prepreg is selected as T700 carbon fiber / Shuangma QY8911-I system.

[0063] Cut the selected prepreg according to the inner diameter of the heating cavity 2, then spread 20 layers of prepreg in the heating cavity 2 to form a laminate, and then cover the vent sheet 3; A sealing gasket 7 with a hole in the middle is placed on the upper end surface, and a vacuum nozzle 6 is placed on the sealing gasket 7. One end of the vacuum nozzle 6 is connected to a vacuum pump 9 through a vacuum tube 8; use a temperature controller 10 to heat the laminate to 80°C, and open it at the same time Vacuum pump 9; the air in the laminated body is discharged through the through hole on the exhaust sheet 3; the vacuum pump 9 draws the vacuum degree in the heating mold cavity 2 to 95KPa and closes the vacuum pump 9, takes off the vacuum pumping device, stops heating, and obtains a sample Sample 4;

[0064] 2. Sample curing

[0065] One end of the plunger 1 ...

Embodiment 3

[0069] 1. Sample preparation

[0070] The prepreg is selected as T700 carbon fiber / epoxy 3234 system.

[0071] Cut the selected prepreg according to the inner diameter of the heating cavity 2, then spread 10 layers of prepreg in the heating cavity 2 to form a laminate, and then cover the vent sheet 3; A sealing gasket 7 with a hole in the middle is placed on the upper end surface, and a vacuum nozzle 6 is placed on the sealing gasket 7. One end of the vacuum nozzle 6 is connected to a vacuum pump 9 through a vacuum tube 8; use a temperature controller 10 to heat the laminate to 60°C, and open it at the same time Vacuum pump 9; the air in the laminated body is discharged through the through hole on the exhaust sheet 3; the vacuum pump 9 draws the vacuum degree in the heating mold cavity 2 to 80KPa and closes the vacuum pump 9, takes off the vacuum pumping device, stops heating, and obtains a test sample Sample 4;

[0072] 2. Sample curing

[0073] One end of the plunger 1 is...

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PUM

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Abstract

A method for eliminating the pores generated during hot die pressing of resin-based composition includes such steps as laying the pre-dipped material layer by layer, heating while vacuumizing, and constant-pressure heating, solidifying, and natural cooling. An apparatus for testing the pore generating condition is also disclosed.

Description

technical field [0001] The present invention relates to a process method for eliminating pore defects in the process of hot press forming, more particularly, it refers to a test device suitable for the condition of pore formation in the process of hot press forming of resin-based composite materials, and by controlling the appropriate A process method for eliminating pore defects under certain temperature and pressure conditions. Background technique [0002] Resin-based composite materials are different from traditional materials, and their material formation and component molding are completed at the same time, so the molding process has a direct and decisive effect on the quality of the part. At present, the main forming process of main load-bearing structural composite materials used in the aerospace field is hot pressing forming. Hot pressing forming is a very complicated process involving a variety of physical, chemical and coupling changes. Once the process conditions...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C43/58B29C43/52B29C43/32B29C70/40B29C70/54B29K105/06
Inventor 李敏张佐光顾轶卓孙志杰张大兴李艳霞
Owner BEIHANG UNIV