KR20170049741A - Carbon fiber reinforced composite spring manufacturing method - Google Patents

Carbon fiber reinforced composite spring manufacturing method Download PDF

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KR20170049741A
KR20170049741A KR1020150150033A KR20150150033A KR20170049741A KR 20170049741 A KR20170049741 A KR 20170049741A KR 1020150150033 A KR1020150150033 A KR 1020150150033A KR 20150150033 A KR20150150033 A KR 20150150033A KR 20170049741 A KR20170049741 A KR 20170049741A
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South Korea
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carbon fiber
spring
resin
spring material
reinforced composite
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KR1020150150033A
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Korean (ko)
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KR101756678B1 (en
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박경래
박동원
김영근
김형민
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윈엔윈(주)
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D22/00—Producing hollow articles
    • B29D22/02—Inflatable articles
    • B29D22/023—Air springs; Air bellows

Abstract

A method for manufacturing a carbon fiber-reinforced composite material spring according to the present invention comprises the steps of: impregnating a carbon fiber with a resin to form a first carbon fiber layer by winding a gelled first carbon fiber prepreg around the mandrel; Forming a second carbon fiber layer by winding a gelled second carbon fiber prepreg on the first carbon fiber layer by impregnating a carbon fiber with a resin; Forming a third carbon fiber layer by winding a gelled third carbon fiber prepreg on the second carbon fiber layer by impregnating the carbon fiber with a resin; Removing the mandrel when the first to third carbon fiber layers are partially cured to obtain a tubular first spring material; Injecting a first spring material into a mold having a helical forming space; Injecting high pressure air into the hollow of the first spring material inserted into the mold so that the first to third carbon fiber layers are expanded and integrated with each other so that the first spring material is cured by the helical third spring material; Separating a third spring material of a cured helical shape from the mold; And cutting a helical third spring material to a predetermined length to produce a carbon fiber-reinforced composite spring finished product.

Description

Technical Field [0001] The present invention relates to a carbon fiber reinforced composite spring manufacturing method,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a carbon fiber-reinforced composite material spring, and more particularly, to a method of manufacturing a spring material using a gel prepreg and a knitted prepreg produced by impregnating a carbon fiber with a resin And a method of manufacturing a carbon fiber-reinforced composite material spring that can be molded into a helical spring material by injecting it into a mold.

Nanoparticles including carbon nanotubes (CNTs) are excellent in electrical conductivity, thermal conductivity and strength, so nanocomposites can be obtained which have properties much improved than those of originally polymeric structures even when a small amount is added to the polymer. Particularly recently, research on the development of a composite material having improved physical properties required by adding CNT to various materials is actively under way.

However, in order to use nanocomposites for structural and multifunctional purposes, hybridization of microfibers with CNTs or CNTs with CNTs is required. It is inevitable to increase the amount of addition of the catalyst.

In addition, as disclosed in Patent Document 1, the CNT-containing composite material is a lightweight, high-strength material, and many studies have been conducted in order to widely apply it in the aerospace and defense industry fields in particular.

However, due to the low structural / functional properties of polymeric materials, the properties in the thickness direction are weak, which hinders wide application of composite materials and insufficient reliability data and material stability data. Accordingly, much research has been conducted on the production of structural composite materials requiring high strength and high rigidity by impregnating carbon fibers with CNT mixed resin.

Korean Patent Application Publication No. 10-2014-0113636 (April 24, 2014) Korea Patent Office Registration No. 10-1551091 (2015.09.08.) Korean Patent Application Publication No. 10-2001-0019780 (Mar. 15, 2001) Korean Intellectual Property Office Registration No. 10-0145345 (Apr. 29, 1998) United States Patent and Trademark Office Patent US 7,857,294 (Dec. 28, 2010)

The present invention has been made to solve the problems of the prior art as described above, and it is an object of the present invention to provide a carbon fiber reinforced composite material capable of improving the mechanical, thermal, electrical / electronic, chemical / And to provide a method for manufacturing a material spring.

As described above, the object of the present invention can be achieved by a method of manufacturing a carbon fiber composite material, comprising the steps of: a1) forming a first carbon fiber layer by impregnating a carbon fiber with a resin and winding a gelled first carbon fiber prepreg around the mandrel; b1) forming a second carbon fiber layer by impregnating a carbon fiber with a resin and winding a gelled second carbon fiber prepreg on the first carbon fiber layer; c1) forming a third carbon fiber layer by impregnating a carbon fiber with a resin and winding a gelled third carbon fiber prepreg on the second carbon fiber layer; d1) the first to third carbon fiber layers of the three layers formed in steps a1), b1) and (c1) are partially cured to remove the mandrel to obtain a tubular first spring material; e1) injecting the first spring material obtained in step d1) into a mold having a helical forming space; f1) In step e1), high-pressure air is injected into the hollow of the first spring material inserted into the mold, so that the first to third carbon fiber layers of the three layers are expanded and integrated with each other, Allowing the material to cure; g1) separating the cured helical third spring material from the mold in step f1); And h1) cutting a third helical spring material to a predetermined length to produce a carbon fiber reinforced composite spring finished product; And a method of manufacturing a carbon fiber-reinforced composite material spring.

The present invention also provides a method of manufacturing a carbon fiber composite material, comprising the steps of: a2) forming a first carbon fiber layer by impregnating a carbon fiber with a resin and winding a gelled first carbon fiber prepreg around the mandrel; b2) forming a second carbon fiber layer by impregnating a carbon fiber with a resin and winding the gelled second carbon fiber prepreg on the first carbon fiber layer; c2) forming a third carbon fiber layer by impregnating a carbon fiber with a resin and winding the gelled third carbon fiber prepreg on the second carbon fiber layer; d2) the first to third carbon fiber layers of the three layers formed in steps a2), b2) and (c2) are partially cured to remove the mandrel to obtain a tubular first spring material; e2) injecting the first spring material obtained in step d2) into a mold having a rod-shaped molding space; f2) In step e2), high-pressure air is injected into the hollow of the first spring material inserted into the mold, so that the first to third carbon fiber layers of the three layers are expanded and integrated with each other, Allowing the material to cure; g2) separating the cured tubular second spring material from the mold in step f2); h2) forming a tubular second spring material into a helical third spring material; And i2) cutting a third spring material formed into a helical shape in step h2) to a predetermined length to produce a carbon fiber-reinforced composite spring finished product. do.

In the present invention, 1 to 5 parts by weight of carbon nanotubes (CNTs) are added to the resin in steps a1), a2), b1), b2), c1) and c2).

In the present invention, the resin in the steps a1), a2), b1), b2), c1) and c2) is a thermosetting resin selected from the group consisting of an epoxy resin, a phenol resin, an unsaturated polyester resin and a vinyl ester resin.

Further, in the present invention, the first carbon fiber layer is wound in a thickness of 7/10 to 9/10 with respect to the diameter of the spring material to be produced in steps a1) and a2).

Further, in the present invention, the first carbon fiber prepreg is a UD tape in steps a1) and a2).

In the present invention, the carbon fibers are one carbon fiber selected from the group consisting of 1K carbon fibers, 3K carbon fibers, 6K carbon fibers, 12K carbon fibers and 24K carbon fibers in steps b1), b2), c1) and c2).

According to the present invention, a spring of a carbon fiber reinforced composite material is formed by molding a spring material using a gelled carbon fiber prepreg and a carbon fiber prepreg formed by impregnating a carbon fiber with a resin, Shaped carbon fiber-reinforced composite material spring is formed by molding with a spring material of a shape, it has a lower density than a metal, has a high tensile strength and tensile elasticity, is resistant to fatigue / strength, and has mechanical characteristics excellent in wear characteristics and lubricity.

Further, according to the present invention, the spring of the carbon fiber reinforced composite material has a small linear expansion coefficient and dimensional stability, and is resistant to thermal mechanical properties and destruction / deterioration, that is, And has a thermal characteristic that thermal conductivity is low at an extremely low temperature.

Further, according to the present invention, the spring of the carbon fiber-reinforced composite material has electrical and electronic properties such that it has excellent electrical conductivity (ratio), electromagnetic wave protection, and X-ray transmission property.

Further, according to the present invention, the spring of the carbon fiber reinforced composite material is chemically stable and has chemical and physicochemical properties such that it is excellent in resistance to various solvents such as acid, alkali and the like.

1 to 7 are schematic views showing a process for manufacturing a carbon fiber-reinforced composite material spring according to a first embodiment of the present invention.
FIG. 8 is a schematic view showing a process of injecting high-pressure air into a hollow of a spring material from which a mandrel is removed during a process of manufacturing a carbon fiber-reinforced composite material spring according to a second embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The carbon fiber-reinforced composite material spring according to the present invention can be manufactured by two methods, and most of the manufacturing processes are the same, and a process of forming the shape of the carbon fiber reinforced composite material spring into a helical shape in the mold, A different shape is shown in a process of forming a molded spring material into a helical shape through a separate molding process. The following two methods for producing the carbon fiber-reinforced composite material spring will be described in detail in the following Example 1 and Example 2.

1 to 7 are schematic views showing a process for manufacturing a carbon fiber-reinforced composite material spring according to a first embodiment of the present invention.

1 to 6, a first carbon fiber prepreg 11 is prepared by impregnating a carbon fiber with a resin (thermosetting resin or thermoplastic resin) for a predetermined time to form a gelled first carbon fiber prepreg 11, And the first carbon fiber layer 21a is formed by winding the carbon fiber layer 21a in a uniform thickness (see Fig. 1). At this time, the length of the first carbon fiber layer 21a formed by the mandrel 11, that is, the first carbon fiber prepreg 21, may vary depending on the length of the carbon fiber-reinforced composite material spring to be manufactured.

The first carbon fiber prepreg 21 which is wound around the mandrel 11 to form the first carbon fiber layer 21a is a UD tape which is made of a carbon fiber reinforced composite material having a diameter , It is preferable to have a thickness of 7/10 to 9/10.

Here, one of carbon fibers selected from among 1K carbon fiber, 3K carbon fiber, 6K carbon fiber, 12K carbon fiber and 24K carbon fiber is used as a filament as an initial product of carbon fiber.

After the first carbon fiber layer 21a is formed by winding the first carbon fiber prepreg 21 gelled on the mandrel 11 to a uniform thickness as described above and then the first carbon fiber layer 21a is thermosetting resin The second carbon fiber layer 22a is formed by impregnating the thermoplastic resin and winding the gelled second carbon fiber prepreg 22 into a gelled shape (see Fig. 2). Next, the third carbon fiber layer 22a is again impregnated with a thermosetting or thermosetting resin on the carbon fiber layer 22a to form a third carbon fiber layer 23a (see FIG. 3) by winding the gelled carbon fiber prepreg 23 )do.

At this time, the second carbon fiber prepreg 22 and the third carbon fiber prepreg 23 forming the second carbon fiber layer 22a and the third carbon fiber layer 23a may be wound into a single layer, The carbon fiber prepreg 22 and the third carbon fiber prepreg 23, the use of the carbon fiber-reinforced composite material spring to be produced, and the like.

As the resin constituting the gelled first carbon fiber prepreg 21 wound on the mandrel 11 and the knitted second and third carbon fiber prepregs 22 and 23, A resin, a phenol resin, an unsaturated polyester resin, a vinyl ester resin and the like can be used.

The resin constituting the first carbon fiber prepreg 21 and the second and third carbon fiber prepregs 22 and 23 is added with 1 to 5 parts by weight of carbon nanotubes (CNTs) to the resin, The adhesive strength is 30% or more higher than that of a general epoxy resin, and the elastic modulus of the spring is increased by 20% or more.

The first carbon fiber prepreg 21 gelled into the mandrel 11, the second carbon fiber prepreg 22 and the third carbon fiber prepreg 23 are sequentially wound to form the first through third carbon fiber layers 21a The first carbon fiber prepreg 21 constituting each of the first to third carbon fiber layers 21a, 22a and 23a and the second carbon fiber prepreg 21 constituting each of the first to third carbon fiber layers 21a, 22a and 23a, When the leg 22 and the third carbon fiber prepreg 23 are partially cured, the mandrel 11 is removed (see FIGS. 4 and 5) to form a tubular shape for molding the carbon fiber- The first spring material 20a can be obtained.

The first spring material 20a obtained through the above process is introduced into the molds 31 and 32 having a helical forming space and then the hollow 20c of the first spring material 20a is pressurized to a high pressure The first to third carbon fiber layers 21a, 22a and 23a of the three layers are expanded so as to be closely contacted with the molding space of the molds 31 and 32, Is cured by the third spring material 20 having a helical shape (see FIG. 6).

In the above description, the inner mold 31 and the outer mold 32 are vertically separated. However, the present invention is not limited to this, and two or more molds may be vertically or horizontally separated. The third spring material 20 formed in the molds 31 and 32 can be deformed in accordance with the use of a spring, a square, or the like in cross section.

The molds 31 and 32 may be provided with a separate heating device or a cooling device in order to secure the time required when the first spring material 20a is molded into the helical third spring material 20 It is possible.

Finally, after the cured helical third spring material 20 is separated from the molds 31 and 32 (see Fig. 7), the helical third spring material 20 is cut to a length set according to the application To produce a carbon fiber reinforced composite spring finished product.

In the description of the second embodiment, the same process as that of the first embodiment will be described with reference to Figs. 1 to 5 and Fig. 7, and the process different from the first embodiment will be described with reference to Fig. Here, FIG. 8 is a schematic view showing a process of injecting high-pressure air into a hollow of a spring material from which a mandrel is removed during a process of manufacturing a carbon fiber-reinforced composite material spring according to a second embodiment of the present invention.

1 to 5, 7, and 8, first, a first carbon fiber prepreg 11 is prepared by impregnating a carbon fiber with a thermosetting or thermoplastic resin for a predetermined time to form a gelled first carbon fiber prepreg 11, ) To form a first carbon fiber layer 21a (see Fig. 1). At this time, the length of the first carbon fiber layer 21a formed by the mandrel 11, that is, the first carbon fiber prepreg 21, may vary depending on the length of the carbon fiber-reinforced composite material spring to be manufactured.

The first carbon fiber prepreg 21 which is wound around the mandrel 11 to form the first carbon fiber layer 21a is a UD tape having a diameter of 7/10 to the diameter of the carbon fiber- To 9/10.

Here, one of carbon fibers selected from among 1K carbon fiber, 3K carbon fiber, 6K carbon fiber, 12K carbon fiber and 24K carbon fiber is used as a filament as an initial product of carbon fiber.

After the first carbon fiber layer 21a is formed by winding the first carbon fiber prepreg 21 gelled on the mandrel 11 to a uniform thickness as described above and then the carbon fiber is thermosetting or thermoplastic on the first carbon fiber layer 21a, And the second carbon fiber layer 22a is formed by winding the gelled second carbon fiber prepreg 22 by impregnating the resin (see Fig. 2). Next, the third carbon fiber layer 22a is impregnated with the thermosetting resin on the third carbon fiber layer 22a, and the gelled carbon fiber prepreg 23 is wound to form the third carbon fiber layer 23a (see Fig. 3).

At this time, the second carbon fiber prepreg 22 and the third carbon fiber prepreg 23 forming the second carbon fiber layer 22a and the third carbon fiber layer 23a may be wound into a single layer, The carbon fiber prepreg 22 and the third carbon fiber prepreg 23, the use of the carbon fiber-reinforced composite material spring to be produced, and the like.

Here, as the resin constituting the gelled first carbon fiber prepreg 21 wound on the mandrel 11 and the knitted second and third carbon fiber prepregs 22 and 23, a thermosetting resin is used . At this time, as the thermosetting resin, an epoxy resin, a phenol resin, an unsaturated polyester resin, and a vinyl ester resin are used.

The resin constituting the first carbon fiber prepreg 21 and the second and third carbon fiber prepregs 22 and 23 is added with 1 to 5 parts by weight of CNT to the resin, 30% or more higher than that of the resin and 20% or more of the elastic modulus of the spring.

The first carbon fiber prepreg 21 gelled into the mandrel 11, the second carbon fiber prepreg 22 and the third carbon fiber prepreg 23 are sequentially wound to form the first through third carbon fiber layers 21a The first carbon fiber prepreg 21 constituting each of the first to third carbon fiber layers 21a, 22a and 23a and the second carbon fiber prepreg 21 constituting each of the first to third carbon fiber layers 21a, 22a and 23a, When the leg 22 and the third carbon fiber prepreg 23 are partially cured, the mandrel 11 is removed (see FIGS. 4 and 5) to form a tubular shape for molding the carbon fiber- The first spring material 20a can be obtained.

The first spring material 20a obtained through the above process is introduced into the molds 33 and 34 having a rod-like forming space and then the high pressure The first to third carbon fiber layers 21a, 22a and 23a of three layers are integrally expanded with each other so as to be closely contacted with the molding space of the molds 33 and 34 to form the first spring material 20a, Shaped second spring material 20b (see Fig. 8).

The upper mold 33 and the lower mold 34 are vertically separated from each other. However, the present invention is not limited to this, and two or more molds may be separated vertically or vertically. In addition, the second spring material 20b molded in the molds 33 and 34 can be deformed in accordance with the use of a spring, a square, or the like, in addition to the cross section.

The molds 33 and 34 may be provided with a separate heating device or a cooling device in order to secure the necessary time when the first spring material 20a is formed into the tubular second spring material 20b It is possible.

Finally, the hardened tubular second spring material 20b is formed into a helical third spring material 20 (see FIG. 7) through a separate process, and then the helical third spring material 20 is formed. Is cut to a length set according to the purpose to produce a carbon fiber reinforced composite spring finished product.

In the above embodiment, carbon fibers are exemplified as the fibers impregnated with the thermosetting resin. However, the present invention is not limited thereto, and carbon fibers, glass fibers, aramid fibers, high-tensile PE fibers, acrylic fibers and nylon fibers can also be used.

Also, as CNT added to the carbon fiber impregnated in the thermosetting resin also uses carbon fiber, glass fiber, aramid fiber, tough PE fiber, acrylic fiber and nylon fiber instead of the carbon fiber as described above, can be changed.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Modification is possible. Accordingly, the spirit of the present invention should be understood only by the appended claims, and all equivalent or equivalent variations thereof are included in the scope of the present invention.

11: mandrel 20: third spring material
20a: first spring material 20b: second spring material
20c: hollow 21: first carbon fiber prepreg
21a: first carbon fiber layer 22: second carbon fiber prepreg
22a: second carbon fiber layer 23: third carbon fiber prepreg
23a: third carbon fiber layer 31: inner mold
32: outer mold 33: upper mold
34: Lower mold

Claims (8)

a1) forming a first carbon fiber layer by impregnating a carbon fiber with a resin and winding the gel-coated first carbon fiber prepreg on the mandrel;
b1) forming a second carbon fiber layer by impregnating a carbon fiber with a resin and winding a gelled second carbon fiber prepreg on the first carbon fiber layer;
c1) forming a third carbon fiber layer by impregnating a carbon fiber with a resin and winding a gelled third carbon fiber prepreg on the second carbon fiber layer;
d1) removing the mandrel when the first to third carbon fiber layers of the three layers formed in steps a1), b1) and (c1) partially harden to obtain a tubular first spring material;
e1) injecting the first spring material obtained in step d1) into a mold having a helical forming space;
f1) injecting high-pressure air into the hollow of the first spring material injected into the mold in step e1), the first to third carbon fiber layers of the three layers are expanded and integrated with each other, To form a third spring material of a shape;
g1) separating the third spring material of the cured helical shape from the mold in step f1); And
h1) cutting the third spring material having a helical shape to a predetermined length to produce a carbon fiber-reinforced composite spring finished product; Wherein the carbon fiber-reinforced composite material spring is formed of a carbon fiber-reinforced composite material. a2) forming a first carbon fiber layer by impregnating a carbon fiber with a resin and winding the gelled first carbon fiber prepreg around the mandrel;
b2) forming a second carbon fiber layer by impregnating a carbon fiber with a resin and winding a gelled second carbon fiber prepreg on the first carbon fiber layer;
c2) forming a third carbon fiber layer by impregnating a carbon fiber with a resin and winding a gelled third carbon fiber prepreg on the second carbon fiber layer;
d2) when the first to third carbon fiber layers of the three layers formed in steps a2), b2) and c2) are partially cured, removing the mandrel to obtain a tubular first spring material;
e2) injecting the first spring material obtained in step d2) into a mold having a rod-shaped molding space;
f2) In the step e2), high-pressure air is injected into the hollow of the first spring material inserted into the mold so that the first to third carbon fiber layers of the three layers are expanded and integrated with each other, To form a second spring material of a shape;
g2) separating the tubular second spring material cured in step f2) from the mold;
h2) shaping the tubular second spring material into a helical third spring material; And
i2) cutting the third spring material formed into a helical shape in step h2) to a predetermined length to produce a carbon fiber-reinforced composite spring finished product; Wherein the carbon fiber-reinforced composite material spring is formed of a carbon fiber-reinforced composite material. 3. The method according to claim 1 or 2,
Wherein a carbon nanotube (CNT) is added to the resin in the steps a1), a2), b1), b2), c1), and c2). 3. The method according to claim 1 or 2,
Wherein the resin in the steps a1), a2), b1), b2), c1), and c2) is a thermosetting resin selected from the group consisting of epoxy resin, phenol resin, unsaturated polyester resin, Spring manufacturing method. 5. The method according to any one of claims 1 to 4,
Wherein the first carbon fiber layer is wound in a thickness of 7/10 to 9/10 with respect to a diameter of the spring material to be manufactured in the steps a1) and a2). 5. The method according to any one of claims 1 to 4,
Wherein the first carbon fiber prepreg is a UD tape (Uni-Direction tape) in the steps a1) and a2). 5. The method according to any one of claims 1 to 4,
Wherein the carbon fiber is one carbon fiber selected from the group consisting of 1K carbon fiber, 3K carbon fiber, 6K carbon fiber, 12K carbon fiber and 24K carbon fiber in the steps b1), b2), c1) Spring manufacturing method. A carbon fiber reinforced composite material spring produced by the manufacturing method according to any one of claims 1 to 3.
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