Mechanical shot peening forming and strengthening method of fiber-metal super-hybrid composite laminated sheet

A technology of mechanical shot peening and shot peening, which is applied in the direction of chemical instruments and methods, lamination, control lamination, etc. It can solve the problems of high mold cost, failure to meet the manufacturing requirements and preparation of aerospace components, and achieve processing flexibility strong effect

Active Publication Date: 2017-05-10
NANJING INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, self-forming can only produce single-curvature components with small curvatures, and cannot form more complex double-curvature or multi-curvature components; at the same time, this process needs to be formed while the material is solidified in an autoclave, and its forming flexibility Small, high mold cost
Not only that, the springback problem of the self-forming process is significant, and repeated empirical repairs are required, which increases the cost of mold manufacturing
Chinese patent CN201410056071.3 discloses an invention patent named "Preparation and Forming Method of Glare Components", but this patent cannot be prepared in an autoclave, and the obtained fiber-metal hyperhybrid composite material will have significant defects and cannot Meet manufacturing requirements for aerospace components
Secondly, the metal layer and fiber layer of the fiber-metal hyperhybrid composite material are only 0.2mm-0.5mm. The shot peening method and process of the existing metal material will directly cause fiber damage and interface failure, which cannot meet its forming requirements.

Method used

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  • Mechanical shot peening forming and strengthening method of fiber-metal super-hybrid composite laminated sheet
  • Mechanical shot peening forming and strengthening method of fiber-metal super-hybrid composite laminated sheet
  • Mechanical shot peening forming and strengthening method of fiber-metal super-hybrid composite laminated sheet

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Example 1: Refer to the attached figure 1 The mechanical shot peening forming and strengthening method of a fiber-metal super-hybrid composite laminate shown includes the following steps:

[0034] The first step is to select a 3 / 2 structure with a thickness of 1.5mm, such as image 3 As shown, the glass fiber-aluminum alloy super-hybrid composite material with a fiber layer direction of 0° / 90°, wherein the uppermost layer is the metal layer 4, the middle is the 0° fiber layer 5, and the bottom is the 90° fiber layer 6. The specific material The components are S4 high-strength glass fiber, epoxy resin, 2024 aluminum alloy;

[0035] The second step is to cut the material to 6000mm×1000mm by means of CNC milling. The specific milling process parameters are: rotation speed 14000r / min, feed speed 2m / min, back-cutting amount 0.1mm, tool diameter 1mm, Oil cooler;

[0036] The third step is to fix the glass fiber-aluminum alloy super-hybrid composite material on the surface of the s...

Embodiment 2

[0042] The first step is to select a 5 / 4 structure with a thickness of 2.6mm and a carbon fiber-titanium alloy super-hybrid composite with a fiber layer direction of 0° / 0°. The specific material components are T700 carbon fiber, polyimide resin, and TC4 Aluminum alloy

[0043] The second step is to cut the material to 600mm×600mm by means of CNC milling. The specific process parameters are: rotation speed 10000r / min, feed speed 1m / min, back-cutting amount 0.1mm, tool diameter 2mm, water cooling;

[0044] The third step is to fix the carbon fiber-titanium alloy super-hybrid composite material on the surface of the supporting device by bonding and fixing;

[0045] The fourth step is to select AZB600 ceramic pellets, and perform single-sided shot peening on the material at a shot peening strength of 0.25A to obtain 80% shot peening coverage. The specific process parameters are: shot peening pressure 0.22MPa, flow rate 10Kg / min, distance 600mm, spray angle 90°, machine speed 505.5mm / mi...

Embodiment 3

[0048] The first step is to select a 2 / 1 structure with a thickness of 1.0mm and a carbon fiber-aluminum alloy hybrid composite with a fiber layer direction of 0° / 90° / 0°. The specific material components are T300 carbon fiber, polypropylene resin, and 7075 Aluminum alloy

[0049] The second step is to cut the material to 3000mm×900mm by means of CNC milling. The specific milling process parameters are: speed 16000r / min, feed speed 2m / min, back-cutting amount 0.05mm, tool diameter 05mm, Oil cooler;

[0050] The third step is to fix the carbon fiber-titanium alloy super-hybrid composite material on the surface of the supporting device by bonding and fixing;

[0051] The fourth step is to select AZB210 ceramic pellets, and perform double-sided shot peening and strengthening of the material at a shot peening strength of 0.105A, so that the material can obtain 100% shot peening coverage. The specific process parameters are: shot peening pressure 0.35MPa, flow rate 6Kg / min, distance 500m...

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Abstract

The invention discloses a mechanical shot peening forming and strengthening method of a fiber-metal super-hybrid composite laminated sheet. The mechanical shot peening forming and strengthening method comprises the following steps: cutting the fiber-metal super-hybrid composite laminated sheet out with a milling and cutting method; after the cut laminated sheet is fixed in a bonding fixing manner, performing shot peening forming at the coverage rate being 60-100% on a composite material surface by using a shot peening technology of which the shot peening strength is lower than 0.25A; controlling the shot peening surface of the composite material surface to obtain compressive stress lower than 200MPa; performing damage detection and analysis and curvature detection and analysis by ultrasonic wave C scanning and a test device; and finally performing profiling. The mechanical shot peening forming and strengthening method disclosed by the invention is the only flexible non-mold forming method provided in accordance with a fiber-metal super-hybrid composite material at present, and is low in cost and high in flexibility; an effective solution is provided for the forming of double-curvature members and multi-curvature members of the type of the composite material, and the static strength and the fatigue performance of the material are obviously improved; and urgent requirements for large-sized complex members of the type of the composite materials in aerospace industry can be met by the mechanical shot peening forming and strengthening method, and a good thought for the plasticity forming of other lamellar composite materials is provided.

Description

Technical field [0001] The invention belongs to the technical field of forming advanced composite materials, and particularly relates to a mechanical shot peening forming and strengthening method for a fiber-metal super-hybrid composite laminate. Background technique [0002] Fiber-metal super-hybrid composite material is an inter-layer hybrid composite material formed by alternately laying metal sheets and fiber composite materials and curing them at a certain temperature and pressure. It combines the characteristics of traditional fiber composite materials and metal materials, has high specific strength and specific stiffness, excellent fatigue performance and high damage tolerance. These advantages have made this type of material have been widely used in the aerospace industry , And has great application potential in rail transit, automobiles and other industrial fields. [0003] The forming of fiber-metal super-hybrid composite materials generally has two ideas, that is, formi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B38/00B32B41/00
CPCB32B38/0004B32B38/0012B32B41/00B32B2041/04
Inventor 李华冠王章忠陶杰侯文卿郭训忠田精明
Owner NANJING INST OF TECH
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