Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for airtight detection of composite mold

A technology of air tightness detection and detection method, which is applied in liquid tightness measurement using liquid/vacuum degree, by measuring the increase and deceleration rate of fluid, sorting, etc., which can solve the problem of long detection period, high cost, and great influence, etc. problems, to achieve the effect of improving airtight pass rate, eliminating vacuum blockage, and improving high-pressure airtightness

Active Publication Date: 2020-12-01
CHENGDU AIRCRAFT INDUSTRY GROUP
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Based on the above theoretical analysis and experimental verification: the respective leakages A1, A2, A3, A4 of the components of the composite mold tooling airtight detection system, the pass rate X1, X2, X3, X4, the air permeability of the air felt, and the airtight composite material The conclusion of the mold air tightness test has a great influence, and there is a possibility of "misjudgment"; repeated tests may find the best test data, but the test cycle is long and the cost is high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for airtight detection of composite mold
  • A method for airtight detection of composite mold
  • A method for airtight detection of composite mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] An airtight detection method for a composite material mold, which uses an airtight detection system for detection, and mainly includes the following steps:

[0045] Step S100: Conduct an airtight test at room temperature and normal pressure; if it is unqualified, check whether there is leakage in the components of the airtight test system and eliminate it;

[0046] Step S200: Carry out the cold pressure test in the autoclave; if it is unqualified, check whether there is leakage in the components of the airtight test system and eliminate it;

[0047] Step S300: Carry out high temperature and high pressure detection in the autoclave; if unqualified, analyze and determine the cause of unqualified according to the pressure, temperature, time graph and data record table; if the following situations occur, the problem existing in the airtight detection system is related to Composite mold 1 has nothing to do: the vacuum degree drops rapidly at a certain point of time and becom...

Embodiment 2

[0050] This embodiment is optimized on the basis of Embodiment 1. If the above situation does not occur in the step S300, the air tightness test is performed again. When the two air tightness test data are all unqualified, and the pressure, temperature and time curves When the maximum deviation in the graph is less than 0.10bar, the cause of failure is ruled out as a problem with the airtight detection system.

[0051] The present invention proposes airtight detection in three stages of room temperature and normal pressure, cold pressure, and high temperature and high pressure. The present invention improves the airtight pass rate of high temperature and high pressure detection through step-by-step detection. Quickly locate the cause of the airtight problem, improve the accuracy of airtight detection, reduce misjudgment, and have good practicability.

[0052] Other parts of this embodiment are the same as those of Embodiment 1, so details are not repeated here.

Embodiment 3

[0054] This embodiment is optimized on the basis of Embodiment 1 or 2. In the step S100, the airtightness detection method at room temperature and normal pressure: the vacuum degree of the vacuum source is less than or equal to -0.93bar, vacuumize, and the vacuum degree of the airtightness detection system is stable The final vacuum degree is less than or equal to the vacuum degree of the vacuum source 0.01 bar. After the vacuum degree of the air tightness detection system is stable for 10 minutes, stop the vacuum source, and the vacuum degree drop value within 10 minutes should be less than or equal to 0.01 bar.

[0055] In the step S200, the cold pressure detection method in the autoclave: at room temperature, the vacuum degree of the vacuum source should be less than or equal to -0.95 bar, pressurize to 6.8 bar, and after 10 minutes of stabilizing the pressure, the vacuum degree of the airtight detection system should be less than or equal to vacuum The source vacuum is 0.05...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a composite mold air tightness detecting method. The method is particularly applicable to composite mold air tightness qualified detection with temperature being 180 DEG C, pressure being 6.8 bar and vacuum leakage not larger than 0.10 bar. The air tightness qualified standard at the room temperature normal pressure and cold pressing stages can be improved to increase the airtightness qualified rate at the high temperature and pressure stages, and misjudgment on whether or not the composite mold air tightness is qualified is reduced. Air tightness at the three stages ofroom temperature normal pressure, cold pressing and high temperature and pressure is put forwards, and the air tightness qualified rate for high temperature and pressure detection is increased through progressive detection; by analyzing the detecting condition under the high temperature and pressure stages, the reason of the air tightness problem can be rapidly positioned, the air tightness detection accuracy is improved, misjudgment is reduced, and the good practicability is achieved.

Description

technical field [0001] The invention belongs to the technical field of airtightness devices, and in particular relates to an airtightness detection method for composite molds. Background technique [0002] Modern military and civil aircraft use a large number of composite materials, and the molding and bonding of composite parts and components require composite molds. The forming and bonding of high-performance composite parts mainly adopt the process of heating, pressurizing and vacuuming in autoclave at present. Therefore, there are strict requirements on the airtightness of composite molds. [0003] The airtightness criteria of a certain type of Airbus aircraft for composite molds are as follows: testing at room temperature and normal pressure, the vacuum degree is not greater than -0.80bar, and the vacuum leakage does not exceed 0.17bar in 5 minutes; it is qualified; testing at high temperature and high pressure, The vacuum degree is not greater than -0.80bar, the tempe...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/26B07C5/34
CPCB07C5/3404G01M3/26
Inventor 张勇兵
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com