CN107285796B - Carbon-based composite material spiral spring and production method thereof - Google Patents

Carbon-based composite material spiral spring and production method thereof Download PDF

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CN107285796B
CN107285796B CN201710599454.9A CN201710599454A CN107285796B CN 107285796 B CN107285796 B CN 107285796B CN 201710599454 A CN201710599454 A CN 201710599454A CN 107285796 B CN107285796 B CN 107285796B
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spring
carbon
carbon fiber
composite material
spiral
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CN107285796A (en
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廖寄乔
谭周建
李丙菊
刘学文
石磊
王冰泉
李军
王跃军
龚玉良
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Hunan Jinbo Carbon Co ltd
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Abstract

The invention discloses a production method of a carbon-based composite material spiral spring introducing Z-direction carbon fibers in a direction perpendicular to the axis of the spiral spring, which is characterized by comprising the following steps of: firstly, winding carbon fiber bundles or carbon fiber cloth on a core mold along the spiral line direction of a spring, wherein the direction of continuous long fibers of the carbon fiber bundles or the carbon fiber cloth is consistent with the spiral line direction of the spring, then winding a carbon fiber net tire on the core mold, and needling along the radial direction of the core mold; repeating the processes to prepare a carbon fiber spring prefabricated body; the method comprises the following steps: machining; the ratio of the number of continuous carbon fibers in the spiral line direction of the prepared spiral spring to the number of carbon fibers in the Z direction is 1: 0.01 to 0.4; the elastic constant of the spiral spring is 0.5 kg/mm to 10 kg/mm; according to the invention, because Z-direction carbon fibers are introduced in the direction vertical to the axis of the spring during blank manufacturing, interlayer combination is good, and the prepared carbon-based composite material spiral spring has good mechanical properties.

Description

Carbon-based composite material spiral spring and production method thereof
Technical Field
The invention relates to a carbon-based composite material, in particular to a carbon-based composite material spiral spring and a production method thereof, and particularly relates to a carbon-based composite material spiral spring with Z-direction carbon fibers introduced in the direction vertical to the axis of the spiral spring and a production method thereof.
Background
With the development of science and technology, the requirements of various high and new technical fields on the use performance of springs are increasingly strict, common metal springs cannot meet the use requirements of advanced or special fields such as new energy, national defense, chemical engineering, aerospace, semiconductors and the like, and the springs are required to work in a high-temperature environment or a corrosive environment in many designs and do not cause metal pollution. Such as: in the welding process of the high-temperature alloy, the brazing temperature of the nickel-based brazing filler metal is about 1200 ℃, and in order to fix the positions of weldment and inhibit the problem of high-temperature deformation, a clamp is needed to realize the brazing process. Generally, such a clamp is provided with a spring member, which is capable of withstanding high temperatures, and is required to have good high-temperature elasticity, relaxation resistance, and the like. At present, the service temperature of a common metal spring is not more than 200 ℃, the service temperature of a spring made of special heat-resistant spring steel is only about 500 ℃, and a high-temperature alloy spring resistant to the temperature of more than 600 ℃ is expensive and can cause metal pollution. For this purpose, there are springs made of ceramic material. For example, patent application No. 201310710651.5 entitled ceramic spring forming device and method for manufacturing ceramic spring discloses a ceramic spring. However, ceramic materials are brittle and have poor thermal shock resistance. Although the toughness can be improved by modification, the performance is limited and the price is not good due to the limitation of great forming difficulty and complexity of the process.
The carbon/carbon composite material has the excellent performances of light specific gravity, high modulus, large specific strength, low thermal expansion coefficient, high temperature resistance, thermal shock resistance, corrosion resistance, good vibration absorption, good friction performance and the like, and is a true novel material with multiple functions, designability, structure and function.
European patent EP0684216a2 discloses a method for preparing a carbon/carbon composite material coil spring. The spring is prepared by winding carbon fibers on a core mold integrally after preforming, and then performing high-temperature mold pressing, shaping, carbonization and the like. However, since the preformed strip has a short spiral path close to the central axis and a long spiral path far from the central axis during winding, different layers will be laid along the respective paths, which inevitably results in stress and delamination, and there is no Z-direction carbon fiber in the direction perpendicular to the axis of the spring during winding, which finally results in poor structural capability and low rigidity of the whole spring.
Disclosure of Invention
The invention aims to provide a carbon-based composite material spiral spring with Z-direction carbon fibers introduced in the direction perpendicular to the axis of the spiral spring and a production method thereof.
The invention adopts the following technical scheme to realize the aim of the invention, and discloses a production method of a carbon-based composite material spiral spring, which comprises the following steps:
making a blank: firstly, winding carbon fiber bundles or carbon fiber cloth with the pitch width of a spring on a core mold along the spiral line direction of the spring, wherein the direction of continuous long fibers of the carbon fiber bundles or the carbon fiber cloth is consistent with the spiral line direction of the spring, then winding a carbon fiber net tire on the core mold, carrying out needling along the radial direction of the core mold, and introducing Z-direction carbon fibers; repeating the processes to prepare a carbon fiber spring preform with a required size;
the surface density of the carbon fiber net tire is 10g/m2～100g/m2Needling density of 10 times/cm2About 40 times per cm2The needling depth is 6-25 mm, and the volume density of the carbon fiber spring preform is 0.3 g/cm3～0.6g/㎝3。
⑵, densifying, namely preparing the carbon fiber spring preform prepared in the step ⑴ into a carbon/carbon composite material spring green body through chemical vapor deposition or/and liquid phase impregnation carbonization, wherein the volume density of the carbon/carbon composite material spring green body is 0.8 g/cm3～1.5g/㎝3；
In order to meet the requirements of high-temperature use and high-purity environment, the carbon/carbon composite material spring blank prepared in the second step is placed into a high-temperature furnace before the third step, and is heated under the vacuum condition for impurity removal and graphitization treatment, wherein the temperature is 1800-2800 ℃, and the heat preservation time is 2-15 hours.
Machining: and processing the carbon/carbon composite material spring blank obtained in the step two into the spiral spring according to the required size.
In order to introduce continuous long fibers in the axial direction of a spiral spring, improve the axial resistance of the spiral spring in the compression direction of the spring and improve the deformation resistance of spiral reverse fibers, the method comprises the steps of winding a carbon fiber bundle or carbon fiber cloth with the pitch width of the spring on a core mold along the spiral line direction of the spring, and then respectively winding a carbon fiber net tire, the carbon fiber cloth and the carbon fiber net tire on the core mold one by one, wherein the trend of the continuous long fibers of the carbon fiber cloth is consistent with the axial direction of the core mold during winding, and simultaneously, needling is performed along the radial direction of the core mold by winding the carbon fiber net tire once, and Z-direction carbon fibers are introduced; and repeating the processes to prepare the carbon fiber spring preform with the required size.
The surface density of the carbon fiber net tire is 10g/m2～100g/m2Needling density of 10 times/cm2About 40 times per cm2The needling depth is 6-25 mm, and the volume density of the carbon fiber spring preform is 0.3 g/cm3～0.6g/㎝3。
In order to further improve the elastic coefficient of the helical spring, after step ⑵, the carbon/silicon carbide composite material spring blank is prepared by impregnating and cracking the carbon/carbon composite material spring blank with silicon-containing resin or carrying out chemical vapor deposition or reaction melting and siliconizing on trichloromethylsilane, and the volume density of the carbon/silicon carbide composite material spring blank is 1.6 g/cm3～2.6g/㎝3。
A carbon-based composite material helical spring produced by the production method of the carbon-based composite material helical spring is characterized in that the ratio of the number of continuous carbon fibers in the helical line direction of the spring to the number of carbon fibers in the Z direction in the helical spring is 1: 0.01 to 0.4; the elastic constant of the spiral spring is 0.5 kg/mm-10 kg/mm.
The ratio of the number of continuous carbon fibers in the spiral line direction of the spring to the number of continuous carbon fibers in the axial line direction of the spring in the spiral spring is 1: 0 to 3.
The ratio of the number of continuous carbon fibers in the spiral line direction of the spring to the number of carbon fibers in the Z direction in the spiral spring is preferably 1: 0.05 to 0.2; the ratio of the number of continuous carbon fibers in the spiral line direction of the spring to the number of continuous carbon fibers in the axial direction of the spring in the spiral spring is preferably 1: 1/2-2.
The optimal ratio of the number of continuous carbon fibers in the spiral line direction of the spring to the number of carbon fibers in the Z direction in the spiral spring is 1: 0.1; the optimal ratio of the number of continuous carbon fibers in the spiral line direction of the spring to the number of continuous carbon fibers in the axial line direction of the spring in the spiral spring is 1: 1.
due to the adoption of the technical scheme, the purpose of the invention is well realized, the Z-direction carbon fibers are introduced in the direction vertical to the axis of the spring during blank making, so that the complete and continuous long fibers are ensured in the spiral direction of the spiral spring, the interlayer combination is good, the manufacture is simple and convenient, the elastic constant of the prepared carbon-based composite material spiral spring can reach 0.5 kg/mm-10 kg/mm, and the mechanical property is good.
Drawings
Fig. 1 is a schematic view of the structure of the coil spring of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings and examples.
Example 1:
a production method of a carbon-based composite material spiral spring comprises the following steps:
making a blank: firstly, winding carbon fiber bundles or carbon fiber cloth with the pitch width of a spring on a core mold along the spiral line direction of the spring, wherein the direction of continuous long fibers of the carbon fiber bundles or the carbon fiber cloth is consistent with the spiral line direction of the spring, then winding a carbon fiber net tire on the core mold, carrying out needling along the radial direction of the core mold, and introducing Z-direction carbon fibers; repeating the processes to prepare a carbon fiber spring preform with a required size;
the surface density of the carbon fiber net tire is 10g/m2～100g/m2Needling density of 10 times/cm2About 40 times per cm2The needling depth is 6-25 mm, and the volume density of the carbon fiber spring preform is 0.3 g/cm3～0.6g/㎝3。
⑵ densification the carbon fiber spring preform prepared in step ⑴ is subjected to chemical vapor deposition or-And liquid-phase impregnation and carbonization to prepare a carbon/carbon composite material spring green body, wherein the volume density of the carbon/carbon composite material spring green body is 0.8 g/cm3～1.5g/㎝3；
In order to meet the requirements of high-temperature use and high-purity environment, the carbon/carbon composite material spring blank prepared in the second step is placed into a high-temperature furnace before the third step, and is heated under the vacuum condition for impurity removal and graphitization treatment, wherein the temperature is 1800-2800 ℃, and the heat preservation time is 2-15 hours.
Machining: and processing the carbon/carbon composite material spring blank obtained in the step two into the spiral spring according to the required size.
A carbon-based composite material helical spring produced by the production method of the carbon-based composite material helical spring is characterized in that the ratio of the number of continuous carbon fibers in the helical line direction of the spring to the number of carbon fibers in the Z direction in the helical spring is 1: 0.01 to 0.4; the elastic constant of the spiral spring is 0.5 kg/mm-10 kg/mm.
The ratio of the number of continuous carbon fibers in the spiral line direction of the spring to the number of carbon fibers in the Z direction in the spiral spring is preferably 1: 0.05 to 0.2;
the optimal ratio of the number of continuous carbon fibers in the spiral line direction of the spring to the number of carbon fibers in the Z direction in the spiral spring is 1: 0.1;
in this embodiment, on a cylindrical core mold, a carbon fiber cloth with a spring pitch width is firstly wound for 1 week or a multiple of 1 week (1 week in this embodiment) along the spiral line direction of the spring, the direction of continuous long fibers of the carbon fiber cloth is consistent with the spiral line direction of the spring, the carbon fiber cloth is a carbon fiber unidirectional cloth, and the surface density is 200g/m2(ii) a Then, the carbon fiber net blank was wound around the core mold for 1 week or a multiple of 1 week (in this example, 1 week), the number of the winding cycles of the carbon fiber cloth was the same as the number of the winding cycles of the carbon fiber net blank, and the surface density of the carbon fiber net blank was 60g/m2(ii) a Needling is carried out along the radial direction of the core mold, and the needling density is 30 cm/cm2The needling depth is 15 mm, and Z-direction carbon fibers are introduced in the direction vertical to the axis of the spiral spring; repeating the above steps to obtain carbon fiber spring preform with required sizeThe spring preform is in a cylindrical shape, and the volume density of the spring preform is 0.46 g/cm3。
The carbon fiber spring preform prepared in the previous step is subjected to chemical vapor deposition, and the volume density of the deposited carbon/carbon composite material spring blank is 1.2 g/cm3(ii) a Then, putting the carbon/carbon composite material spring blank into a high-temperature furnace, heating under a vacuum condition to remove impurities and graphitize, wherein the temperature is 2200 ℃, and the heat preservation time is 5 hours; finally, a circular coil spring of the desired dimensions is machined, as shown in fig. 1.
In order to determine a suitable ratio range of the number of continuous carbon fibers and the number of Z-direction carbon fibers in the coil spring along the spiral line direction of the spring, in the embodiment, when preparing cylindrical coil springs with an outer diameter of 48 mm, an inner diameter of 26 mm, a free height of 70 mm, a pitch of 20 mm and a pitch of 10 mm, the coil springs processed under different ratio conditions are tested (equipment: a universal electronic mechanical testing machine; test conditions: a pressurization rate of 5 mm/min), the number of Z-direction carbon fibers can be adjusted through the surface density, the needling density and the needling depth of the carbon fiber net tire, and the test results are shown in table 1.
Table 1:
Figure DEST_PATH_IMAGE001
as can be seen from table 1, although the test pieces numbered 1, 2, and 3 incorporate Z-direction carbon fibers, the continuous fibers are seriously damaged due to high needling density, and the stress curve of the coil spring is nonlinear and easily broken during the test. No Z-direction carbon fiber is introduced into the test piece with the serial number of 15, and the interlayer combination of the spiral spring is poor during testing, so that the layering phenomenon is easy to occur. And the stress curve of the spiral spring is linear when the test pieces with the serial numbers of 4 to 14 are tested, so that the test piece has better performance. Meanwhile, as can be seen from table 1, the ratio of the number of continuous carbon fibers in the spiral direction of the spring to the number of carbon fibers in the Z direction in the coil spring is 1: preferably 0.01 to 0.4 times; the preferred ratio is 1: 0.05 to 0.2; in combination with other properties, the optimal ratio is 1: 0.1.
in the embodiment, the Z-direction carbon fibers are introduced in the direction perpendicular to the axis of the spring, so that the coil spring has complete and continuous long fibers in the spiral direction, interlayer bonding is good, the prepared carbon-based composite material coil spring has good mechanical properties, and the elastic constant can reach 0.5 kg/mm to 5 kg/mm.
The invention can prepare the spiral springs with different shapes according to the core moulds with different shapes.
Example 2:
in order to further improve the elastic coefficient of the helical spring, after step ⑵, the carbon/silicon carbide composite material spring blank is prepared by impregnating and cracking the carbon/carbon composite material spring blank with silicon-containing resin or carrying out chemical vapor deposition or reaction melting and siliconizing on trichloromethylsilane, and the volume density of the carbon/silicon carbide composite material spring blank is 1.6 g/cm3～2.6g/㎝3。
In this embodiment, after the carbon fiber spring preform is subjected to chemical vapor deposition, trichloromethylsilane is then subjected to chemical vapor deposition to prepare a carbon/silicon carbide composite material spring green body, wherein the volume density of the carbon/silicon carbide composite material spring green body is 2.0 g/cm3。
The elastic constant of the spiral spring made of the carbon-based composite material can reach 3.0 kg/mm to 10 kg/mm.
The same as in example 1.
Example 3:
in order to introduce continuous long fibers in the axial direction of a spiral spring, improve the axial resistance of the spiral spring in the compression direction of the spring and improve the deformation resistance of spiral reverse fibers, the method comprises the steps of winding a carbon fiber bundle or carbon fiber cloth with the pitch width of the spring on a core mold along the spiral line direction of the spring, and then respectively winding a carbon fiber net tire, the carbon fiber cloth and the carbon fiber net tire on the core mold one by one, wherein the trend of the continuous long fibers of the carbon fiber cloth is consistent with the axial direction of the core mold during winding, and simultaneously, needling is performed along the radial direction of the core mold by winding the carbon fiber net tire once, and Z-direction carbon fibers are introduced; and repeating the processes to prepare the carbon fiber spring preform with the required size.
The surface density of the carbon fiber net tire is 10g/m2～100g/m2Needling density of 10 times/cm2About 40 times per cm2The needling depth is 6-25 mm, and the volume density of the carbon fiber spring preform is 0.3 g/cm3～0.6g/㎝3。
The ratio of the number of continuous carbon fibers in the spiral line direction of the spring to the number of continuous carbon fibers in the axial line direction of the spring in the spiral spring is 1: 0 to 3.
The ratio of the number of continuous carbon fibers in the spiral line direction of the spring to the number of continuous carbon fibers in the axial line direction of the spring in the coil spring is preferably 1: 1/2-2.
The optimal ratio of the number of continuous carbon fibers in the spiral line direction of the spring to the number of continuous carbon fibers in the axial line direction of the spring in the spiral spring is 1: 1.
in this embodiment, on a cylindrical core mold, a carbon fiber cloth with a spring pitch width is firstly wound for 1 week or a multiple of 1 week (1 week in this embodiment) along the spiral line direction of the spring, the direction of continuous long fibers of the carbon fiber cloth is consistent with the spiral line direction of the spring, the carbon fiber cloth is a carbon fiber unidirectional cloth, and the surface density is 200g/m2(ii) a Then, the carbon fiber net tire, the carbon fiber cloth and the carbon fiber net tire are respectively and individually wound on the core mold for 1 week or a multiple of 1 week (each is 1 week in the embodiment), the direction of continuous long fibers of the carbon fiber cloth is consistent with the axial direction of the core mold when the carbon fiber cloth is wound, meanwhile, needle punching is carried out on the carbon fiber net tire along the radial direction of the core mold once the carbon fiber net tire is wound, and Z-direction carbon fibers are introduced, wherein the surface density of the carbon fiber net tire is 40g/m2And needling density of 30 cm/cm2The needling depth is 15 mm; the carbon fiber spring preform with the required size is prepared by repeating the processes, and is in a cylindrical shape, and the volume density of the carbon fiber spring preform is 0.50 g/cm3。
The carbon fiber spring preform prepared in the previous step is subjected to chemical vapor deposition, and the volume density of the deposited carbon/carbon composite material spring blank is 1.2 g/cm3(ii) a Then, putting the carbon/carbon composite material spring blank into a high-temperature furnace, heating under a vacuum condition to remove impurities and graphitize, wherein the temperature is 2200 ℃, and the heat preservation time is 8 hours; finally, the coil spring is machined to the required dimensions。
In order to determine a suitable range of the ratio of the number of the continuous carbon fibers in the helical line direction of the spring to the number of the continuous carbon fibers in the axial line direction of the spring in the coil spring, in the embodiment, when preparing the cylindrical coil spring with the outer diameter of 48 mm, the inner diameter of 26 mm, the free height of 70 mm, the pitch of 20 mm and the pitch of 10 mm, the coil spring processed under the condition of different ratios is tested (equipment: a universal electronic mechanical testing machine; test condition: a pressurization rate of 5 mm/min), the number of the continuous carbon fibers in the axial line direction of the spring can be adjusted through the surface density of the carbon fiber cloth, and the test result is shown in table 2.
Table 2:
Figure 411175DEST_PATH_IMAGE002
as can be seen from table 2, although the test pieces numbered 1, 2, and 3 incorporate axial carbon fibers, the ratio of continuous long fibers in the spiral direction is low, the deformability is poor, the stress curve of the coil spring during the test is nonlinear, the compression displacement is small, and the coil spring is easily damaged. And the stress curve of the spiral spring is linear deformation when the test piece with the serial number of 4 to 11 is tested, the compression displacement can be realized, and the test piece has better performance. Meanwhile, as can be seen from table 2, the ratio of the number of continuous carbon fibers in the spiral line direction of the spring to the number of continuous carbon fibers in the axial line direction of the spring in the coil spring is 1: preferably 0 to 3 times; the preferred ratio is 1: 1/2-2; in combination with other properties, the optimal ratio is 1: 1.
in the embodiment, the continuous carbon fibers are introduced in the axis direction of the spring while the Z-direction carbon fibers are introduced in the axis direction of the spring in a direction perpendicular to the axis direction of the spring, so that the interlayer combination is good while the coil direction of the coil spring is ensured to be complete and continuous long fibers, the mechanical property of the prepared carbon-based composite material coil spring is good, and the elastic constant can reach 0.5 kg/mm to 5 kg/mm.
The same as in example 1.
Example 4:
in the invention, after step ⑵, the carbon/carbon composite material spring blank is impregnated with silicon-containing resin, cracked or trichloromethylsilanePreparing a carbon/silicon carbide composite material spring green body by chemical vapor deposition or reactive melt siliconizing, wherein the volume density of the carbon/silicon carbide composite material spring green body is 1.6 g/cm3～2.6g/㎝3。
In this embodiment, after the carbon fiber spring preform is subjected to chemical vapor deposition, trichloromethylsilane is then subjected to chemical vapor deposition to prepare a carbon/silicon carbide composite material spring green body, wherein the volume density of the carbon/silicon carbide composite material spring green body is 2.0 g/cm3。
The elastic constant of the spiral spring made of the carbon-based composite material can reach 3.0 kg/mm to 10 kg/mm.
The same as in example 1.
Example 5:
in this embodiment, a plurality of side-by-side carbon fiber bundles with a spring pitch width are wound on a cylindrical core mold for 1 week or a multiple of 1 week (1 week in this embodiment) along the helical line direction of a spring, the running direction of continuous long fibers of the carbon fiber bundles is consistent with the helical line direction of the spring, and then a carbon fiber net blank is wound on the core mold for 1 week or a multiple of 1 week (1 week in this embodiment), the number of the winding cycles of the carbon fiber bundles is the same as the number of the winding cycles of the carbon fiber net blank, and the surface density of the carbon fiber net blank is 60g/m2(ii) a Needling is carried out along the radial direction of the core mold, and the needling density is 30 cm/cm2The needling depth is 15 mm, and Z-direction carbon fibers are introduced in the direction vertical to the axis of the spiral spring; the carbon fiber spring preform with the required size is prepared by repeating the processes, and is in a cylindrical shape, and the volume density of the carbon fiber spring preform is 0.46 g/cm3。
The same as in example 1.
Example 6:
in this embodiment, on a cylindrical mandrel, a plurality of side-by-side carbon fiber bundles with a spring pitch width are wound for 1 week or a multiple of 1 week (1 week in this embodiment) along the spiral line direction of the spring, and the direction of the continuous long fibers of the carbon fiber bundles is consistent with the spiral line direction of the spring; then, the carbon fiber net core, the carbon fiber cloth, and the carbon fiber net core were wound around the core mold one by one, each for 1 week or a multiple of 1 week (each for 1 week in the present example), and the core mold was wound around the core moldThe direction of continuous long fiber is consistent with the axial direction of the core mould when the carbon fiber cloth is wound, the carbon fiber cloth is carbon fiber unidirectional cloth, and the surface density is 200g/m2(ii) a Meanwhile, needling is carried out along the radial direction of the core mold every time the carbon fiber net tire is wound, Z-direction carbon fibers are introduced, and the surface density of the carbon fiber net tire is 40g/m2And needling density of 30 cm/cm2The needling depth is 15 mm; the carbon fiber spring preform with the required size is prepared by repeating the processes, and is in a cylindrical shape, and the volume density of the carbon fiber spring preform is 0.50 g/cm3。
The same as in example 3.

Claims (8)

1. A production method of a carbon-based composite material spiral spring is characterized by comprising the following steps:
making a blank: firstly, winding carbon fiber bundles or carbon fiber cloth with the pitch width of a spring on a core mold along the spiral line direction of the spring, wherein the direction of continuous long fibers of the carbon fiber bundles or the carbon fiber cloth is consistent with the spiral line direction of the spring, then winding a carbon fiber net tire on the core mold, carrying out needling along the radial direction of the core mold, and introducing Z-direction carbon fibers; the ratio of the number of continuous carbon fibers in the spiral line direction of the spring to the number of the carbon fibers in the Z direction in the spiral spring is 1: 0.01 to 0.4; repeating the processes to prepare a carbon fiber spring preform with a required size;
the surface density of the carbon fiber net tire is 10g/m2～100g/m2Needling density of 10 times/cm2About 40 times per cm2The needling depth is 6-25 mm, and the volume density of the carbon fiber spring preform is 0.3 g/cm3～0.6g/㎝3；
⑵, densifying, namely preparing the carbon fiber spring preform prepared in the step ⑴ into a carbon/carbon composite material spring green body through chemical vapor deposition or/and liquid phase impregnation carbonization, wherein the volume density of the carbon/carbon composite material spring green body is 0.8 g/cm3～1.5g/㎝3；
Machining: and processing the carbon/carbon composite material spring blank obtained in the step two into the spiral spring according to the required size.
2. The production method of the carbon-based composite material spiral spring according to claim 1, characterized in that in the step, after carbon fiber bundles or carbon fiber cloth with the spring pitch width are wound on a core mold along the spiral line direction of the spring, a carbon fiber net tire, the carbon fiber cloth and the carbon fiber net tire are respectively wound on the core mold one by one, the direction of continuous long fibers of the carbon fiber cloth is consistent with the axial direction of the core mold during winding, and meanwhile, needling is performed along the radial direction of the core mold for each winding of the carbon fiber net tire, so that Z-direction carbon fibers are introduced; and repeating the processes to prepare the carbon fiber spring preform with the required size.
3. The method for producing the carbon-based composite material helical spring as claimed in claim 1, wherein after the step ⑵, the carbon/silicon carbide composite material spring blank is prepared by impregnating and cracking the carbon/carbon composite material spring blank with a silicon-containing resin, or carrying out chemical vapor deposition or reaction infiltration silicon on trichloromethylsilane to obtain the carbon/silicon carbide composite material spring blank, wherein the volume density of the carbon/silicon carbide composite material spring blank is 1.6 g/cm3～2.6g/㎝3。
4. The production method of the carbon-based composite material helical spring as claimed in claim 1, wherein before the third step, the carbon/carbon composite material spring blank prepared in the second step is placed into a high-temperature furnace, and is heated under a vacuum condition for impurity removal and graphitization treatment, wherein the temperature is 1800-2800 ℃, and the heat preservation time is 2-15 h.
5. A carbon-based composite material coil spring produced by the production method for a carbon-based composite material coil spring as set forth in claim 1, 2, 3 or 4, wherein the ratio of the number of continuous carbon fibers in the spiral direction of the spring to the number of carbon fibers in the Z direction in the coil spring is 1: 0.01 to 0.4; the elastic constant of the spiral spring is 0.5 kg/mm-10 kg/mm.
6. The carbon-based composite material coil spring according to claim 5, wherein the ratio of the number of continuous carbon fibers in the spiral direction of the spring to the number of continuous carbon fibers in the axial direction of the spring in the coil spring is 1: 0 to 3.
7. The carbon-based composite material coil spring according to claim 6, wherein the ratio of the number of continuous carbon fibers in the spiral direction of the spring to the number of carbon fibers in the Z direction in the coil spring is preferably 1: 0.05 to 0.2; the ratio of the number of continuous carbon fibers in the spiral line direction of the spring to the number of continuous carbon fibers in the axial direction of the spring in the spiral spring is preferably 1: 1/2-2.
8. The carbon-based composite material coil spring according to claim 6, wherein the ratio of the number of continuous carbon fibers in the spiral direction of the spring to the number of carbon fibers in the Z direction in the coil spring is optimally 1: 0.1; the optimal ratio of the number of continuous carbon fibers in the spiral line direction of the spring to the number of continuous carbon fibers in the axial line direction of the spring in the spiral spring is 1: 1.
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