CN211057374U - Quasi-three-dimensional prefabricated body for airplane brake disc - Google Patents
Quasi-three-dimensional prefabricated body for airplane brake disc Download PDFInfo
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- CN211057374U CN211057374U CN201921552325.5U CN201921552325U CN211057374U CN 211057374 U CN211057374 U CN 211057374U CN 201921552325 U CN201921552325 U CN 201921552325U CN 211057374 U CN211057374 U CN 211057374U
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- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 67
- 239000004917 carbon fiber Substances 0.000 claims abstract description 67
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000004744 fabric Substances 0.000 claims abstract description 38
- 238000009940 knitting Methods 0.000 claims abstract description 20
- 239000000835 fiber Substances 0.000 claims description 18
- 238000000465 moulding Methods 0.000 claims description 3
- 238000001467 acupuncture Methods 0.000 abstract description 3
- 238000007493 shaping process Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 126
- 238000000034 method Methods 0.000 description 11
- 238000010030 laminating Methods 0.000 description 10
- 239000002356 single layer Substances 0.000 description 7
- 238000003763 carbonization Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009950 felting Methods 0.000 description 3
- 239000002346 layers by function Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 239000002783 friction material Substances 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
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- Braking Arrangements (AREA)
- Laminated Bodies (AREA)
Abstract
The utility model discloses an aircraft brake disc is with accurate three-dimensional prefabricated body, this prefabricated body include frictional layer and structural layer, the frictional layer is formed by carbon fiber net child layup, and the structural layer is formed by basic unit layer layup, the frictional layer includes frictional layer and lower frictional layer, go up the frictional layer is located respectively down on the upper and lower surface of structural layer, basic unit layer is by carbon fiber multiaxis warp knitting fabric and carbon fiber net child through the fixed shaping of acupuncture, adopts the prefabricated body structure of frictional layer-structural layer-last frictional layer down, and the frictional layer has improved the frictional property of prefabricated body, and the structural layer has improved the mechanical properties of prefabricated body.
Description
Technical Field
The utility model relates to a combined material technical field especially relates to an aircraft brake disc is with accurate three-dimensional preform.
Background
The airplane brake disc is a circular friction material with ultrahigh strength, and the application environment is harsh, so the performance requirement on a prefabricated body is very high, the prefabricated body is required to be provided with a friction functional layer and a structural functional layer, the prefabricated body is required to be of a three-dimensional structure, and the structure can meet the friction requirement and the mechanical property requirement.
The technology of pre-oxidized fiber needling preform is the main technology at present, and comprises the steps of laminating carbon fiber cloth and chopped pre-oxidized fiber net tires to form unit layers, and carrying out needling, carbonization and other process structures. However, preforms made of polypropylene fibers pre-oxidized must be converted to carbon fiber structures by a carbonization process. The polyacrylonitrile pre-oxidized fiber has low heat conductivity coefficient, poor carbonization controllability, larger process difficulty and high requirements on equipment and process, and long and short fibers in the pre-oxidized preform generate different stresses to creep in the high-temperature carbonization process to cause overall shrinkage deformation and easy delamination. The existing preparation technology of the prefabricated body has great defects in the aspects of friction resistance and mechanical property, some prefabricated bodies meet the friction property but have insufficient mechanical property, and some prefabricated bodies meet the mechanical property but have substandard friction property.
SUMMERY OF THE UTILITY MODEL
For the requirement that reaches prefabricated body antifriction nature and mechanical properties simultaneously, this application provides the three-dimensional acupuncture prefabricated body of a novel structure.
In order to overcome the prior technical problems, the invention provides a quasi-three-dimensional prefabricated body for an aircraft brake disc and a preparation method thereof, which are used for improving the friction performance, the mechanical performance and the structural stability of the prefabricated body, and the specific technical scheme is as follows:
the utility model provides an aircraft brake disc is with accurate three-dimensional prefabricated body, includes frictional layer and structural layer, the frictional layer is formed by carbon fiber net child layup, and the structural layer is formed by basic unit layer layup, the frictional layer includes frictional layer and lower frictional layer, go up the frictional layer is located respectively down on the upper and lower surface of structural layer, basic unit layer is by carbon fiber multiaxis warp knitting fabric and carbon fiber net child through the fixed shaping of acupuncture.
When the structure of the quasi-three-dimensional prefabricated body for the airplane brake disc is a lower friction layer, a structural layer and an upper friction layer, carbon fibers in a carbon fiber net tire are led into the Z direction through the felting needles, the fabric is connected together to form a three-dimensional structure through penetrating the fabric, and the interlayer density of basic unit layers is 5-6 layers/cm, so that the friction resistance and the structural stability of the quasi-three-dimensional prefabricated body can be improved.
As a further improvement, the method is characterized in that: the volume density of the fiber in the quasi-three-dimensional preform is 0.40g/cm3-0.50g/cm3。
As a further improvement, the method is characterized in that: the mass percentages of the carbon fiber multi-axial warp knitting fabric and the carbon fiber net tire in the quasi-three-dimensional preform are respectively as follows: 65-75% of carbon fiber multi-axial warp knitting fabric and 25-35% of carbon fiber net tire.
As a further improvement, the method is characterized in that: the friction layer is formed by carbon fiber net tires which are layered and needled layer by layer.
The preparation method of the quasi-three-dimensional preform for the aircraft brake disc specifically comprises the following steps:
the method comprises the following steps: preparing an upper friction layer and a lower friction layer;
step two: preparing a basic unit layer, namely fixing the carbon fiber multi-axial warp knitting fabric and the carbon fiber net tire into the basic unit layer by needling, wherein the pre-needling density is 3-8 needles/cm2；
Step three: superposing the basic unit layers on the lower friction layer, and carrying out needling molding;
step four: the basic unit layers are layered layer by layer, carbon fiber yarns in the carbon fiber net tire are brought into the carbon fiber multi-axial warp knitting fabric by needle punching in sequence to form a three-dimensional structure, and a structural layer is formed by reciprocating and circulating;
step five: and paving a friction layer on the upper surface of the structural layer, and carrying out needling forming to obtain the quasi-three-dimensional prefabricated body for the airplane brake disc.
The upper friction layer is used for laminating and needling the carbon fiber net tire layer by layer to form the carbon fiber net tire, the preset thickness is 4-6mm, and the needling density is 20-30 needles/cm2。
The lower friction layer is formed by laying and needling carbon fiber net tires layer by layer to reach the preset thickness of 5-10mm, and the density of the needles is 20-30 needles/cm2。
Laying the basic unit layers on the lower friction layer by layer, needling, making the yarns distributed in each direction as identical as possible after one cycle according to the direction composition of the warp knitting fabric, introducing the carbon fibers in the previous layer of carbon fiber net tire into the carbon fiber multiaxial warp knitting fabric, wherein the needle density is 20-30 needles/cm2。
Wherein the multi-axial warp knitting fabric is formed by weaving carbon fiber filaments on a multi-axial warp knitting machine, and the areal density is 150-2And the fiber specification is 12K.
The final structure of the prefabricated body is a lower friction layer, a structural layer and an upper friction layer, carbon fibers are introduced into the Z direction through felting needles and penetrate through the fabric, so that the fabric is connected together to form a three-dimensional structure, and the friction resistance and the structural stability of the prefabricated body are improved.
As a further improvement, the method is characterized in that: in the fourth step, the density of the felting needles is 20-30 needles/cm2。
As a further improvement, the method is characterized in that: in the second step, the interlayer density is 5-6 layers/cm.
As a further improvement of the utility model, the preform adopts carbon fiber multiaxial warp knitting, provides the homogeneity that the structural layer bore load for the preform more tends to quasi-isotropy.
Compared with the prior art, the utility model discloses a show the effect and be: (1) the structure of the prefabricated body of the lower friction layer, the structural layer and the upper friction layer is adopted, the friction performance of the prefabricated body is improved by the friction layer, and the mechanical performance of the prefabricated body is improved by the structural layer; (2) the structure layer adopts a basic unit layer formed by combining a multi-axial warp knitting fabric and a carbon fiber net tire, wherein the prefabricated body can achieve a quasi-isotropic effect due to the structural characteristics of the multi-axial warp knitting fabric, and can well resist damage or deformation under the condition of applying external force; (3) the carbon fiber multi-axial warp knitting fabric has high production efficiency and stable and uniform gram weight.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic structural view of the upper frictional layer.
Fig. 3 is a schematic structural diagram of a base unit layer.
Fig. 4 is a schematic structural diagram of 3 forms of the carbon fiber multiaxial warp knit fabric.
Description of reference numerals:
1-upper friction layer; 2-Z direction fibers; 3-structural layer; 4-lower friction layer; 5-single-layer carbon fiber net tire; 6-carbon fiber multiaxial warp knit fabric; 7-0 degree direction; 8-90 degrees; 9-45 degrees; 10- +45 deg.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the accompanying drawings and examples, which are only used for explaining the present invention and do not limit the scope of protection.
Example 1
As shown in fig. 1, 2 and 3, in the prefabricated body, an upper friction layer 1 is formed by laminating and needling a plurality of single-layer carbon fiber net tires 5, a structural layer 3 is formed by laminating and needling a plurality of basic unit layers, a lower friction layer 4 is formed by laminating and needling a plurality of single-layer carbon fiber net tires 5, the upper friction layer 1, the structural layer 3 and the lower friction layer 4 are connected into a quasi-three-dimensional fabric through Z-direction fibers 2, and the basic unit layers comprise a carbon fiber multi-axial warp knitted fabric layer and a carbon fiber net tire layer.
Wherein the lower friction layer 4 is 12K and the surface density is 100g/m2The carbon fiber net tire 5 is layered layer by layer and needled to reach the thickness of 5mm, and the needling density is 20 needles/cm2(ii) a The basic unit layer comprises a layer of 12K with the surface density of 300 g/m2A carbon fiber multiaxial warp knitted fabric shown in FIG. 4 (b) and one layer of 12K having an areal density of 300 g/m2The carbon fiber multiaxial warp knitted fabric shown in FIG. 4 (c) has a layer of 12K with an areal density of 100g/m2The carbon fiber net tire 5 is formed by needling, and the needling density is 4 needles/cm2(ii) a The basic unit layer is superposed on the lower friction layer 4, as shown in the figure3, forming by needling, penetrating the fibers in the carbon fiber net tire into the fabric by using needles to form Z-direction fibers 2, continuously superposing basic unit layers, needling layer by layer to form a quasi-three-dimensional prefabricated body, wherein the thickness of a structural layer reaches 3cm, and the density of the needles is 30 needles/cm2(ii) a A friction layer 1 is superposed on the structural layer 3, the upper friction layer 1 is composed of a plurality of single layers of 12K and the surface density of 100g/m2The carbon fiber net tire 5 is layered layer by layer and needled to reach the thickness of 5mm, and the needling density is 20 needles/cm2；
Finally, a preform having a thickness of 4cm and a fiber bulk density of 0.45g/cm was formed3In the preform, the carbon fiber multi-axial warp knitting fabric proportion is 70wt%, the carbon fiber net tire proportion is 30wt%, and the interlayer density of the basic unit layer is 5 layers/cm.
Example 2
As shown in fig. 1, 2 and 3, in the prefabricated body, an upper friction layer 1 is formed by laminating and needling a plurality of single-layer carbon fiber net tires 5, a structural layer 3 is formed by laminating and needling a plurality of basic unit layers, a lower friction layer 4 is formed by laminating and needling a plurality of single-layer carbon fiber net tires 5, the upper friction layer 1, the structural layer 3 and the lower friction layer 4 are connected into a quasi-three-dimensional fabric through Z-direction fibers 2, and the basic unit layers comprise a carbon fiber multi-axial warp knitted fabric layer and a carbon fiber net tire layer.
Wherein the lower friction layer 4 is 12K and has an area density of 200g/m2The carbon fiber net tire 5 is layered layer by layer and needled to reach the thickness of 7mm, and the needling density is 25 needles/cm2(ii) a The basic unit layer comprises a layer of 12K with the surface density of 600g/m2The carbon fiber multiaxial warp knitted fabric shown in FIG. 4 (d) and the areal density of 200g/m2The carbon fiber net tire 5 is formed by needling, and the pre-needling density is 5 needles/cm2(ii) a Superposing a basic unit layer on the lower friction layer 4, as shown in FIG. 3, performing needling molding, penetrating fibers in the carbon fiber mesh into the fabric by using needles to form Z-direction fibers 2 bundles, penetrating the fabric into a quasi-three-dimensional fabric by using the Z-direction fibers, continuously superposing the basic unit layers, performing needling layer by layer to form a quasi-three-dimensional prefabricated body, wherein the thickness of the structural layer reaches 3.6cm, and the density of the needles is 30 needles/cm2(ii) a A friction layer 1 is superposed on the structural layer 3, and the upper friction layer 1 is formed byA dry monolayer of 12K and an areal density of 200g/m2The carbon fiber net tire 5 is formed by laminating and needling, the layers are layered layer by layer and the needling thickness is 7mm, and the needling density is 30 needles/cm2；
Finally, a preform having a fiber bulk density of 0.48g/cm and a thickness of 5cm was formed3In the prefabricated body, the ratio of the carbon fiber multi-axial warp knitting fabric is 65%, the ratio of the carbon fiber net tire is 35%, and the interlayer density of the basic unit layer is 6 layers/cm.
The two embodiments describe a prefabricated body structure of a lower friction layer, a functional layer and an upper friction layer, wherein the friction layers are arranged at two ends of the prefabricated body structure, so that the friction performance is improved, and the performance advantage is more remarkable due to the selection of carbon fiber materials; the structural layer is formed by laminating and needling basic unit layers, the unit layers combined by the multi-axial warp knitted fabric and the net tire are adopted, the prefabricated body can achieve a quasi-isotropic effect due to the structural characteristics of the multi-axial warp knitted fabric, damage or deformation can be well resisted under the condition of applying external force, the carbon fiber net tire has the effect that carbon fiber filaments in the carbon fiber net tire are penetrated into the carbon fiber multi-axial warp knitted fabric through needling, so that the fabric layers are well connected together, the layering phenomenon is reduced, and the mechanical property of the layer is greatly improved; and, carbon fiber multiaxial warp knitting production efficiency is high, and the gram weight is stable and even.
Claims (4)
1. The utility model provides an aircraft is quasi three-dimensional preform for brake disc which characterized in that: including frictional layer and structural layer, the frictional layer is formed by carbon fiber net child layup, and the structural layer is formed by basic unit layer layup, the frictional layer includes frictional layer and lower frictional layer, go up the frictional layer is located respectively down on the upper and lower surface of structural layer, basic unit layer is by carbon fiber multiaxis warp knitting fabric and carbon fiber net child warp knitting fixed molding.
2. A quasi-three-dimensional preform for an aircraft brake disc as claimed in claim 1, wherein: the volume density of the fiber in the quasi-three-dimensional preform is 0.40g/cm3-0.50g/cm3。
3. A quasi-three-dimensional preform for an aircraft brake disc as claimed in claim 1, wherein: the surface density of the carbon fiber multi-axial warp knitting fabric is 150-600g/m2。
4. A quasi-three-dimensional preform for an aircraft brake disc as claimed in claim 1, wherein: the friction layer is formed by carbon fiber net tires which are layered and needled layer by layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921552325.5U CN211057374U (en) | 2019-09-18 | 2019-09-18 | Quasi-three-dimensional prefabricated body for airplane brake disc |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921552325.5U CN211057374U (en) | 2019-09-18 | 2019-09-18 | Quasi-three-dimensional prefabricated body for airplane brake disc |
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| CN211057374U true CN211057374U (en) | 2020-07-21 |
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| CN201921552325.5U Active CN211057374U (en) | 2019-09-18 | 2019-09-18 | Quasi-three-dimensional prefabricated body for airplane brake disc |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110485047A (en) * | 2019-09-18 | 2019-11-22 | 江苏恒神股份有限公司 | A kind of aeroplane brake discs quasi- three-dimensional preform and preparation method thereof |
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- 2019-09-18 CN CN201921552325.5U patent/CN211057374U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110485047A (en) * | 2019-09-18 | 2019-11-22 | 江苏恒神股份有限公司 | A kind of aeroplane brake discs quasi- three-dimensional preform and preparation method thereof |
| CN110485047B (en) * | 2019-09-18 | 2024-04-05 | 江苏恒神股份有限公司 | Quasi-three-dimensional preform for aircraft brake disc and preparation method thereof |
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