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Method for manufacturing composite material porosity detection comparison sample pieces

A manufacturing method and composite material technology, applied in the field of composite material forming, can solve the problems of on-site operation interference, poor sample uniformity, long time required, etc., and achieve the effect of avoiding other interference, simple operation, and good uniformity

Active Publication Date: 2014-02-05
AVIC COMPOSITES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there is no mature manufacturing technology for the above-mentioned standard comparison test blocks used for the porosity detection of composite materials. Traditionally, the engineering field sampling method is adopted, that is, the samples that meet the requirements of pore content and distribution uniformity are collected during mass production. , this method takes a very long time. If you want to collect a set of systematic samples, it will take a long time, and the uniformity of the collected samples is poor, which brings a lot of interference to the on-site operation.
If a new product is transferred to the mass production stage, the sample collected before will interfere with the detection due to the difference in thickness and material system, and it needs to be supplemented or re-calibrated. This method is obviously unable to meet the rapid development of the aviation manufacturing industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The T800 / 977-2 prepreg produced by CYTEC is selected, the blanking size is 400mm×400mm, and the laying sequence is [+45 / -45 / 0 / 90 / 0 / +45 / 0 / -45 / -45 / 0 / +45 / 0 / 90 / 0 / -45 /

[0027] +45], the thickness of the comparison sample is 3.0mm. When laying up, spray 10ml of acetone on the surface of the prepreg for each layer until the laying is completed. After the completion, cover the laminate blanks with BLEEDER LEASE peelable cloth produced by AIRTECH Company, tetrafluoroethylene woven cloth (δ0.07mm), isolation film A4000R produced by AIRTECH Company, and then cover with an aluminum plate with a size of 400mm×400mm. Spread the air-conducting material, package it into the tank and cure it. The curing process is: in an environment with a vacuum degree lower than -0.075MPa, heat up to 90°, pressurize the autoclave to 0.30MPa, keep the temperature for 10 minutes, and stop vacuuming , Connect the vacuum line to the atmosphere, heat up to 180°, keep warm for 2 hours, cool down to belo...

Embodiment 2

[0029] The T800 / 977-2 prepreg produced by CYTEC is selected, the blanking size is 400mm×400mm, and the laying sequence is [+45 / 0 / -45 / 90 / +45 / -45 / 0 / 90 / 0 / + 45 / 0 / -45 / -45 / 0 /

[0030] / 0 / 90 / 0 / -45 / +45 / 90 / -45 / 0 / +45], the thickness of the comparison test block is 4.3mm. When laying up, spray 18ml of acetone on the surface of the prepreg for each layer until the laying is completed. After the completion, cover the laminate blanks with BLEEDER LEASE peelable cloth produced by AIRTECH Company, tetrafluoroethylene woven cloth (δ0.07mm), isolation film A4000R produced by AIRTECH Company, and then cover with an aluminum plate with a size of 400mm×400mm. Spread the air-conducting material, package it into the tank and cure it. The curing process is: in an environment with a vacuum degree lower than -0.075MPa, heat up to 110°, pressurize the autoclave to 0.35MPa, keep the temperature for 20 minutes, and stop vacuuming , Connect the vacuum line to the atmosphere, then raise the temperature to ...

Embodiment 3

[0032] The T800 / 977-2 prepreg produced by CYTEC is selected, the blanking size is 400mm×400mm, and the laying sequence is [+45 / 0 / -45 / 90 / +45 / -45 / 0 / 0 / 0 / + 45 / -45 / 0 / 0 / +45 / 0 / 0

[0033] / -45 / 90 / +45 / -45 / -45 / +45 / 90 / -45 / 0 / 0 / +45 / 0 / 0 / +45 / +45 / 0 / 0 / 0 / -45 / + 45 / 90 /

[0034] -45 / 0 / +45], the thickness of the comparison test block is 7.5mm. When laying up, spray 35ml of acetone on the surface of the prepreg after each layer is laid, until the laying is completed. After the completion, cover the laminate blanks with BLEEDER LEASE peelable cloth produced by AIRTECH Company, tetrafluoroethylene woven cloth (δ0.07mm), isolation film A4000R produced by AIRTECH Company, and then cover with an aluminum plate with a size of 400mm×400mm. Spread the air-conducting material, and then package it into the tank for curing. The curing process is: in an environment with a vacuum degree lower than -0.075MPa, heat up to 90°, pressurize the autoclave to 0.4MPa, keep the temperature for 30 minutes, and stop pump...

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PUM

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Abstract

The invention belongs to composite material forming technologies and relates to a method for manufacturing multi-directional laid composite material porosity detection comparison sample pieces. The method comprises the following steps: when composite material prepreg is laid, adding a solvent which is soluble with resin and can easily volatile among prepreg layers; when laid laminated boards are solidified, adjusting the pressure and the pressure time to form pores, and enabling the pores to be uniformly formed in the laminated boards so as to manufacture the comparison sample pieces meeting composite material laminated board porosity detection. According to the method, a conventional mode that porosity comparison sample pieces need to be accumulated in the long-term production process is changed, the uniformly distributed porosity detection sample pieces with the controllable porosity can be manufactured within a short time, and urgent demands of a new generation aircraft on a porosity detection technology are met.

Description

technical field [0001] The invention belongs to the technical field of composite material forming, and relates to a method for manufacturing a composite material porosity detection comparison sample block. Background technique [0002] With the development of aviation manufacturing technology, the amount of composite materials on the new generation of large passenger aircraft exceeds 50%, which has transitioned from traditional non-bearing parts and secondary load-bearing parts to main load-bearing parts. The overall composite manufacturing of the fuselage, central wing box and other components makes the porosity level of the composite material one of the main factors affecting the safety and stability of the aircraft. The porosity of composite materials is required to be tested in the current passenger aircraft manufacturing and airworthiness certification to ensure that the porosity of composite components is controlled within the scope of the design permit. [0003] Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/44
CPCB29C70/342
Inventor 荀国立邱启艳刘松平史俊伟侯军生
Owner AVIC COMPOSITES
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