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Motor train unit aramid fiber honeycomb in-built part forming process

A technology of aramid honeycomb and forming process, which is applied in lamination devices, layered products, lamination, etc., can solve the problems of inability to form smooth transition angles, and achieve the effects of light weight, improved production efficiency, and improved production efficiency

Inactive Publication Date: 2016-03-09
CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the combination of different materials: low-pressure prepreg, high-strength and low-density aramid paper honeycomb, reinforced fiber felt and other materials are used to form a laminate structure composite material, and the advantages of each material are combined; by adding filling materials to solve the problem of paper honeycomb During the pressing process, the honeycomb collapsed at the leading corner of the end, and the smooth transition angle could not be formed; by confirming the rapid prototyping process of these materials under low conditions, it can meet the mass production requirements of the inner parts of the EMU

Method used

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  • Motor train unit aramid fiber honeycomb in-built part forming process
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The thermoforming process of side wall window panels is as follows:

[0025] according to figure 1 Layup preparation and pressing of materials as shown:

[0026] 1) Cut the aramid honeycomb core material (ECA-I-4.8-48) with a thickness of 10mm;

[0027] 2) Put a layer of phenolic resin glass fiber foam felt COMPOLET400-100-4.5 on the honeycomb board;

[0028] 3) Put two layers of phenolic prepreg PF807 on the upper and lower surfaces of the previously prepared board; weight 500g / m 2 , resin content (weight) 40%,

[0029] 4) Wrap the laminated layer with isolation film;

[0030] 5) Hot pressing: Place the prepared sandwich plate blanks correctly in the hot press, adjust the thickness gasket between the molds, so that the thickness between the molds is 0.2mm smaller than the nominal thickness of the part; the set temperature is the mold temperature of the press The temperature is 135°C, and the pressure of the pressing plate is 0.4MPa; then hot pressing is carried ou...

Embodiment 2

[0032] The hot pressing forming process of the luggage rack arc plate is as follows:

[0033] 1) Cut the aramid honeycomb core material (ECA-I-4.8-48) with a thickness of 6mm;

[0034] 2) Put a layer of phenolic resin glass fiber foam felt COMPOLET400-100-4.5 on the honeycomb board;

[0035] 3) Put two layers of cyanic acid prepreg PN900 on the upper and lower surfaces of the previously prepared board; weight 600g / m 2 , resin content (weight) 50%;

[0036] 4) Wrap the laminated layer with isolation film;

[0037] 5) Hot pressing: Place the prepared sandwich plate blanks correctly in the hot press, adjust the thickness gasket between the molds, so that the thickness between the molds is less than 0.1mm than the nominal thickness of the workpiece; the set temperature is the mold temperature of the press The temperature is 135°C, and the pressure of the platen is 0.1MPa; then hot pressing is carried out according to the molding cycle, the first pressing time is 50S; the second...

Embodiment 3

[0039] The hot pressing forming process of the luggage rack pallet is as follows:

[0040] 1) Cut the aramid honeycomb core material (ECA-I-4.8-48) with a thickness of 15mm;

[0041] 2) Put a layer of phenolic resin glass fiber foam felt COMPOLET400-100-4.5 on the honeycomb board;

[0042] 3) Put two layers of prepreg on the upper and lower surfaces of the previously prepared board; PF807 weight 500g / m 2 , resin content (weight) 40%,

[0043] 4) Wrap the laminated layer with isolation film;

[0044] 5) Hot pressing: Place the finished sandwich plate blanks correctly in the hot press; set the temperature as the mold temperature of the press is 145°C, and the pressure of the pressing plate is 1.0MPa; then perform hot pressing according to the molding cycle, the first time The pressing time is 70S; the second pressing time is 180S; the third pressing time is 60S; the fourth pressing time is 1800S; after each pressing, the mold is lifted by 1mm, and the air release time is 1S. ...

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Abstract

The invention discloses a motor train unit aramid fiber honeycomb in-built part forming process. A panel is prepared from phenolic resin or cyanic acid prepreg; a middle core material is prepared from aramid fiber honeycomb; phenolic resin glass fiber foam felt is placed between the honeycomb and prepreg at corners; two layers of the prepreg are respectively paved on the upper and lower surfaces of the honeycomb; phenolic resin glass fibre foam felt is placed between the honeycomb and prepreg; blank combined by the materials is wrapped by an isolating membrane and then the wrapped blank is put onto a mould for press forming. The in-built part is light in quality, small in density and convenient to dismount, exchange and repair; the fireproofing and smoke prevention performance can reach the M1F1 grade of France NF16101, and accords with UIC564-2 standard; the production efficiency is improved greatly and the part size is accurate.

Description

technical field [0001] The invention relates to a forming process for an interior part of an EMU, in particular to a forming process for an aramid honeycomb interior part. Background technique [0002] At present, traditional materials such as plywood, glass fiber reinforced plastics, aluminum-plastic panels, engineering plastics, etc. are used for interior parts of ordinary rail vehicles. The interior decoration of high-speed EMUs not only requires a certain strength and light weight, but also has a good self-extinguishing fire rating, which meets the requirements of the vehicle fire protection standard, and also requires good resilience, can absorb vibration energy, and has the effect of sound insulation and noise reduction . The interior of CRH5 models uses advanced lightweight composite material aramid honeycomb material for the first time. Aramid honeycomb material was used to manufacture aircraft empennage and wings in the past. The forming process generally adopts au...

Claims

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Application Information

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IPC IPC(8): B32B37/06B32B37/10
CPCB32B37/06B32B37/10
Inventor 周志刚
Owner CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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