KR102526273B1 - Method about making tubes of thermoplastic composite materials - Google Patents

Abstract

A method for manufacturing a thermoplastic composite tube according to an embodiment of the present invention comprises the steps of: arranging a plurality of material yarns, containing a thermoplastic resin necessary for manufacturing a thermoplastic composite tube, in a braiding apparatus; arranging a hollow-formed shaft extending to a predetermined length on the center side of the braiding apparatus; winding a wound body, covering at least a portion of the surface of the hollow-formed shaft, with the material yarns by the operation of the braiding apparatus; arranging the wound body and the hollow-formed shaft in a heating mold and applying heat in a state in which the wound body is supported on the inner wall of the heating mold and the hollow-formed shaft; cooling the wound body; and producing the thermoplastic composite tube by removing the hollow-formed shaft inside the wound body. The thermoplastic composite tube may have a smooth surface.

Description

Manufacturing method of thermoplastic composite tubes {Method about making tubes of thermoplastic composite materials}

The present invention relates to a method of manufacturing a thermoplastic composite tube.

A braiding device is a device used to fabricate articles in which fibers are braided. In general, a braiding device arranges a bobbin wound with a fiber as a material on a rotating horn gear to produce an article by braiding the fibers of the bobbin.

On the other hand, in the case of thermoplastic composites, it is difficult to impregnate fibers due to their unique viscosity. For this reason, in the conventional case, in order to manufacture a composite tube, most of the thermosetting composite materials are impregnated with fibers and braided in a tube form. However, in this case, it took a long time to manufacture the tube due to the curing process due to the nature of the thermosetting material.

In order to shorten the manufacturing time of the composite tube, when using a thermoplastic composite, it is difficult to impregnate the thermoplastic composite into fibers, and the thermoplastic composite is processed in the form of a slit tape and attached to a braiding device.

The slit tape was manufactured by connecting composite tapes obtained by cutting prepreg impregnated with a thermoplastic resin. Generally, the joints of the composite tapes are welded, which is called a splice.

The splice portion may be broken due to friction with an adjacent material during the braiding operation, or may be broken while bending due to rotation of the horn gear and/or the bobbin during the braiding operation. Therefore, for smooth and continuous braiding, it was necessary to prevent these splice parts from being wound on the bobbin.

However, it took a lot of time and effort to wind the slit tape around the bobbin except for the splice part. In addition, when ignoring the splice portion and winding the slit tape around the bobbin, the slit tape was cut during braiding and the braiding device and the bobbin had to be reset several times.

The problem to be solved by the present invention is to provide a method for manufacturing a thermoplastic composite tube capable of continuously braiding using a thermoplastic composite material.

In addition, the problem to be solved by the present invention is to provide a method for manufacturing a thermoplastic composite tube capable of manufacturing a composite tube having a small inner diameter.

The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the following description.

A method for manufacturing a thermoplastic composite tube according to an embodiment of the present invention for solving the above problems includes arranging a plurality of material chambers containing a thermoplastic resin necessary for manufacturing a thermoplastic composite tube in a braiding device, the above Disposing a hollow shaft extending to a predetermined length at the center side of the braiding device, winding a winding body covering at least a part of the surface of the hollow shaft into the material chamber by the operation of the braiding device, the winding The winding body and the hollow shaft are disposed in a heating mold, the winding body is heated while being supported by the inner wall of the heating mold and the hollow shaft, the winding body is cooled, and the hollow shaft inside the winding body removing to create the thermoplastic composite tube.

In the step of heating the winding body, the winding body is pressed in a radial direction by the thermal expansion of the hollow shaft so that the outer surface is plastically deformed smoothly.

The cooling of the winding body causes the hollow shaft to shrink more than the winding body.

The hollow shaft is provided with a mandrel made of PTFE so as to apply a pressure of a predetermined magnitude or more to the winding body by thermal expansion in the step of heating the winding body.

The material yarn is a commingled yarn formed of reinforcing fibers and thermoplastic fibers so that continuous winding around the hollow shaft is possible in the step of winding the winding body.

The material yarn includes a first material yarn that is a reinforcing fiber and a second material yarn that is a thermoplastic resin fiber so that continuous winding around the hollow shaft is possible in the step of winding the winding body.

The first material chamber and the second material chamber are arranged in the braiding device so that the winding body has a predetermined braiding pattern in the step of winding the winding body.

The heating mold includes an arrangement groove in which the winding body is disposed, and a plurality of hot wires spaced apart from each other by a predetermined distance and disposed to surround the arrangement groove.

In the step of heating the winding body, the heating mold is heated by the plurality of heating wires.

The heating mold includes a plurality of cooling lines positioned between the plurality of heating wires.

In the step of cooling the winding body, the winding body and the hollow shaft are cooled by cooling the heating mold using the cooling line.

The hollow shafts are spaced apart from the center toward both ends in response to the temperature gradient in the heating mold so as to apply a pressure within a predetermined range to each part of the winding body by the thermal expansion in the step of heating the winding body. It is formed so that the coefficient of thermal expansion is high.

Other specific details of the invention are included in the detailed description and drawings.

According to embodiments of the present invention, at least the following effects are provided.

It is possible to continuously braid until a desired thickness of the tube is obtained, and thus, it is possible to manufacture thermoplastic composite tubes having various thicknesses.

A thermoplastic composite tube having a smooth surface can be fabricated.

Effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a diagram showing an example of a braiding device.
2 is a diagram showing a slit tape.
3 is a flow chart of a method for manufacturing a thermoplastic composite tube according to an embodiment of the present invention.
Figure 4 is a view showing a material chamber and a bobbin that can be used in the method of manufacturing a thermoplastic composite tube according to an embodiment of the present invention.
5 is a schematic diagram of a hollow shaft that can be used in the manufacturing method of a thermoplastic composite tube according to an embodiment of the present invention.
Figure 6 is a view schematically showing that the winding body is wound around the hollow shaft of Figure 5;
7 is a schematic cross-sectional view in a state in which a hollow shaft and a winding body are disposed in a heating mold that can be used in a method of manufacturing a thermoplastic composite tube according to an embodiment of the present invention.
8 is a cross-sectional view schematically illustrating that a step of heating the winding body according to an embodiment of the present invention is performed using the heating mold of FIG. 7 .
9 is a view schematically illustrating that a step of cooling the winding body according to an embodiment of the present invention is performed using the heating mold of FIG. 7 .
10 is a view schematically showing another example of a hollow shaft that can be used in the manufacturing method of a thermoplastic composite tube according to an embodiment of the present invention.
11 is a view schematically showing another example of a hollow shaft that can be used in the method of manufacturing a thermoplastic composite tube according to an embodiment of the present invention.
12 is a diagram showing braiding patterns that can be applied to a method for manufacturing a thermoplastic composite tube according to an embodiment of the present invention.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims.

In addition, the embodiments described in this specification will be described with reference to cross-sectional views and/or schematic views, which are ideal exemplary views of the present invention. Accordingly, the shape of the illustrative drawings may be modified due to manufacturing techniques and/or tolerances. In addition, in each drawing shown in the present invention, each component may be shown somewhat enlarged or reduced in consideration of convenience of explanation. Like reference numbers designate like elements throughout the specification.

The 'material room' mentioned below refers to a material used by a braiding device to perform braiding. For example, the material thread may be obtained by processing various materials into fibers.

A 'bobbin' referred to below may be a bobbin mounted on a braiding device. Specifically, the bobbin may be a member in which at least one material chamber is wound for easy use.

The 'hollow shaft' referred to below is a member that is mounted on a braiding device and winds material yarns. Specifically, the hollow shaft is a mandrel used in a braiding process, and may be a frame around which a material thread is wound. For example, the hollow shaft may be configured to have a substantially cylindrical shape. However, it is not limited thereto, and the shape of the hollow shaft may be formed corresponding to the shape of the thermoplastic composite tube to be manufactured.

First, in order to aid understanding of the present invention, a conventionally used braiding device and a slit tape will be briefly described with reference to FIGS. 1 and 2 .

1 is a diagram showing an example of a braiding device. A braiding device 1 has been used to fabricate articles by braiding fibers. As shown in FIG. 1, in the braiding device 1, a bobbin 3 is placed on a rotating horn gear 2, and an article is braided with the fibers of the bobbin 3. .

Meanwhile, FIG. 2 is a view showing a slit tape. A conventional thermoplastic composite tube was produced by a braiding device 1 by winding a slit tape around a bobbin 3. As shown in FIG. 2 , the slit tape 4 was manufactured by connecting the composite tapes 5 and 6 obtained by cutting prepreg as a base material. At this time, the connection portion of the composite tapes 5 and 6 is welded, which is referred to as a splice.

Hereinafter, a method for manufacturing a thermoplastic composite tube according to an embodiment of the present invention will be described with reference to FIGS. 3 to 12 .

3 is a flow chart of a method for manufacturing a thermoplastic composite tube according to an embodiment of the present invention. As shown in FIG. 3, in the method of manufacturing a thermoplastic composite tube according to an embodiment of the present invention, a plurality of material chambers are arranged in a braiding device (S10), and a hollow shaft is arranged in the braiding device. Step (S20), winding the winding body (S30), heating the winding body (S40), cooling the winding body (S50), generating a thermoplastic composite tube (S60), and processing the thermoplastic composite tube (S70) is included.

First, in step S10 in which a plurality of material yarns are arranged in the braiding device, the material yarns are arranged in the braiding device. Specifically, in this step, the user arranges a material chamber containing a thermoplastic resin in the braiding device 1.

In this step, the user determines the number and arrangement of bobbins 3 to be mounted in consideration of the braiding pattern to be wound. In addition, the user selects a material chamber in consideration of the physical properties of the thermoplastic composite tube desired to be manufactured.

For example, when selecting a material chamber, the user will be able to select the material chamber in consideration of various factors such as the weight ratio of thermoplastic resin and other materials, types of other materials other than thermoplastic, and thickness of reinforcing fibers.

In the step (S20) of arranging the hollow shaft in the braiding device, the hollow shaft extending to a predetermined length is disposed at the center of the braiding device. In this step, the user mounts the hollow shaft on which the material thread is wound to the braiding device.

The hollow shaft installed in this step is then removed, and the space occupied by the hollow shaft becomes a slot of the thermoplastic composite tube. Therefore, in this step, the user may select the hollow shaft disposed in the braiding device in consideration of the following points.

First, the user determines the length of the hollow axis corresponding to the length of the thermoplastic composite tube to be manufactured. At this time, the predetermined length of the hollow shaft may be determined to be equal to or longer than the length of the thermoplastic composite tube, which is the final product.

In addition, the user may select the diameter of the hollow shaft in consideration of the diameter of the slot formed in the thermoplastic composite tube intended to be manufactured or the inner diameter of the thermoplastic composite tube.

In step S30 of winding the winding body, the user operates the braiding device 1 to wind the material thread on the surface of the hollow shaft. At this time, the braiding pattern of the winding body is determined by the material yarns arranged in step S10 in which a plurality of material yarns are arranged in the braiding device.

Specifically, the user continues braiding until the winding body wound around the hollow shaft becomes a predetermined length and/or has a predetermined thickness. The user continues braiding, and when the winding body has a predetermined length and/or predetermined thickness, the braiding device 1 is stopped and the winding body and the hollow shaft are separated from the braiding device 1.

In the step of heating the winding body (S40), the user heats the winding body and the hollow shaft separated from the braiding device 1.

In this step, the user plastically deforms the winding body by using the thermal expansion of the hollow shaft. Specifically, the user can heat the winding body and the hollow shaft while supporting the outer surface of the winding body using a fixing member such as a mold having a smooth surface capable of supporting the winding body. As consolidation progresses, the heated winding body is brought into close contact with the surface of the fixing member by thermal expansion of the hollow shaft, so that the outer surface is plastically deformed smoothly. At this time, the user may use a heating unit such as an oven to heat the winding body and the hollow shaft.

In the step of cooling the winding body (S50), the user cools the winding body and the hollow shaft by using a cooling means. During cooling, the user cools the winding body and the hollow shaft so that the shrinkage rate of the hollow shaft is greater than the shrinkage rate of the winding body. Therefore, when this step is completed, a gap is generated between the winding body and the hollow shaft, and the two are naturally separable.

In the step of generating the thermoplastic composite tube (S60), the hollow shaft is removed from the winding body, and the thermoplastic composite tube, which is a plastically deformed winding body, is created.

Specifically, in this step, the user takes out the winding body and the hollow shaft from the fixing member supporting the winding body, and removes the hollow shaft inside the cooled winding body.

In the step of processing the thermoplastic composite tube (S70), the user cuts and shapes the thermoplastic composite tube obtained in the above step as necessary.

Hereinafter, specific examples of a method of manufacturing a thermoplastic composite tube according to an embodiment of the present invention will be described with reference to FIGS. 4 to 10 . However, this is merely illustrative to help understanding of the present invention, and the present invention should not be construed as being limited to the following examples.

In this example, the user uses commingled yarn 7 as the material thread. Referring to Figure 4, Figure 4 is a view showing a material chamber and a bobbin that can be used in the manufacturing method of the thermoplastic composite tube according to an embodiment of the present invention. As shown in FIG. 4 , the blended yarn 7 may be a fiber bundle in which reinforcing fibers 71 and thermoplastic fibers 72 are mixed.

In this example, in the step (S10) of arranging a plurality of material yarns in the braiding device, the user selects an appropriate mixing ratio between the reinforcing fibers 71 and the thermoplastic resin fibers 72 in consideration of the physical properties of the thermoplastic composite tube to be manufactured. The bobbin (3) on which the mixed yarn is wound is mounted on the braiding device. At this time, the number and arrangement of the bobbins 3 to be mounted may vary depending on the braiding pattern the user wants to wind.

Since this example uses the blended yarn 7, the user can finish winding preparation for the thermoplastic composite tube without arranging the reinforcing fibers 71 and the thermoplastic resin fibers 72 separately in a braiding device, and thus a plurality of The step (S10) of arranging the material yarn in the braiding device can be simplified.

5 is a schematic diagram of a hollow shaft that can be used in the manufacturing method of a thermoplastic composite tube according to an embodiment of the present invention. In the step (S20) of disposing the hollow shaft in the braiding device, the user sets the hollow shaft 11 to the braiding device so that the material chamber is wound on the longitudinal surface of the hollow shaft 11, based on FIG. mounted on

On the other hand, the hollow shaft 11 according to this example may be selected in consideration of the coefficient of thermal expansion as an integral member. For example, the user may select the hollow shaft 11 made of a material having a thermal expansion coefficient greater than a predetermined value and place it in the braiding device. In more detail, the user can select the hollow shaft 11 made of a material whose thermal expansion coefficient is greater than a predetermined value or more than the thermal expansion coefficient of the material chamber in consideration of the step of cooling the winding body (S50) and place it in the braiding device. . For example, the hollow shaft 11 may be formed of Polytetrafluoroethylene (PTFE).

In this example, the reason for selecting the hollow shaft 11 formed of a material having a larger thermal expansion coefficient than a predetermined value is that the larger the thermal expansion coefficient, the hollow shaft 11 presses the winding body in the step of heating the winding body (S40). because the power to do so increases.

After mounting the hollow shaft 11 on the braiding device, in the step of winding the winding body (S30), the user operates the braiding device to wind the winding body 20 around the hollow shaft 11. Referring to Figure 6, Figure 6 is a view schematically showing that the winding body is wound around the hollow shaft of Figure 5.

As shown in FIG. 6 , when the step (S30) of winding the winding body is completed, the winding body 20 in which the material chamber is wound along the outer surface of the hollow shaft 11 is formed.

In order to obtain the winding body 20 of a desired size, the user winds the winding body 20 around the hollow shaft 11 in the winding step (S30) until the winding body 20 reaches a predetermined length and/or a predetermined length. Continue braiding until you have the thickness. When the winding body 20 has a predetermined length and a predetermined thickness by continuing the braiding, the user separates the winding body 20 and the hollow shaft 11 from the braiding device.

Hereinafter, the heating mold 300 that can be used in the step of heating the winding body of this example (S40) and the step of cooling the winding body (S50) will be described with reference to FIG. 7 . 7 is a schematic cross-sectional view in a state in which a hollow shaft and a winding body are disposed in a heating mold that can be used in a method of manufacturing a thermoplastic composite tube according to an embodiment of the present invention.

As shown in FIG. 7 , the heating mold 300 may include an upper mold 310 , a lower mold 320 , a hot wire 330 , a cooling line 340 and a placement groove 350 .

The upper mold 310 and the lower mold 320 may be hingedly connected to each other so that they can be opened and closed. In addition, facing grooves may be formed in the upper mold 310 and the lower mold 320 . These grooves form placement grooves 350 when the lower mold 320 is seated on the upper mold 310 . In this case, inner walls forming the disposition groove 350 in the upper mold 310 and the lower mold 320 may be formed in a smooth shape.

The arrangement groove 350 is a groove in which the hollow shaft 11 and the winding body 20 are disposed. The inner diameter and length of the placement groove 350 may be formed to correspond to the diameter and length of the winding body 20 . For example, the arrangement groove 350 may be formed to have an inner diameter slightly greater than the diameter of the winding body 20 in consideration of thermal expansion of the winding body 20 . In this case, when the winding body 20 is disposed in the arrangement groove 350, a gap may exist between the winding body 20 and the inner wall of the heating mold 300.

The heating wire 330 is disposed adjacent to the arrangement groove 350 to heat the heating mold 300 . For example, the hot wire 330 may be a wire configured to generate heat by receiving power from the outside.

A plurality of hot wires 330 may be provided and inserted into the upper mold 310 and the lower mold 320 to surround the placement groove 350 . In this case, the plurality of hot wires 330 may be spaced apart from each other at predetermined intervals so that heat distribution in the distributing groove 350 is relatively uniform when generating heat.

The cooling line 340 is disposed adjacent to the arrangement groove 350 to cool the heating mold 300 . For example, the cooling line 340 may be a passage through which a refrigerant supplied from the outside moves.

Like or similar to the hot wires 330 , a plurality of cooling lines 340 may be provided and formed in the upper mold 310 and the lower mold 320 to surround the placement groove 350 . In this case, the plurality of cooling lines 340 may be formed spaced apart from each other at predetermined intervals so that heat distribution within the disposition groove 350 is relatively uniform during cooling. For example, the cooling line 340 may be formed between the plurality of hot wires 330 .

In this example, the user uses the heating mold 300 as a fixing member to support the winding body 20 and the hollow shaft 11 during the step of heating the winding body (S40) and the step of cooling the winding body (S50). is available.

First, in order to proceed with the step of heating the winding body (S40), the user opens the upper mold 310 and inserts the winding body 20 separated from the braiding device into the groove of the lower mold 320 and the hollow shaft. (11) is placed. Then, when the user covers the upper mold 310 again, the winding body 20 and the hollow shaft 11 are disposed in the arrangement groove 350 .

Thereafter, the user heats the heating mold 300 by heating the hot wire 330 and transfers heat to the winding body 20 and the hollow shaft 11 disposed in the arrangement groove 350 through this. In this way, the winding body 20 that has received the heat is complexed. At this time, the hollow shaft 11 is heated and thermally expanded due to the received heat.

Referring to FIG. 8 to aid understanding of this, FIG. 8 is a cross-sectional view schematically illustrating the step of heating the winding body according to an embodiment of the present invention using the heating mold of FIG. 7 .

As shown in FIG. 8, when the step (S40) of heating the winding body according to the present example proceeds, the hollow shaft 11 thermally expands inside the winding body 20 to rotate the winding body 20 in the radial direction. pressurized with Due to this, the outer surface facing the heating mold 300 in the winding body 20 is plastically deformed smoothly. This is because the heated winding body 20 is brought into close contact with the inner wall of the heating mold 300 by the hollow forming shaft 11 and the thermoplastic resin is plastically deformed.

FIG. 9 is a view schematically illustrating that a step of cooling the winding body according to an embodiment of the present invention is performed using the heating mold of FIG. 7 .

In this example, the step of cooling the winding body (S50) is performed by the user supplying a refrigerant to the cooling line 340 to cool the heating mold 300.

When the heating mold 300 is cooled, a gap is generated between the hollow shaft 11 and the winding body 20 due to a difference in shrinkage rate according to a thermal expansion coefficient. Due to this, cooling proceeds and the hollow shaft 11 and the winding body 20 are naturally separated.

In addition, in this example, the user may connect the hollow shaft 11 and a separate cooling device, and separate the two by supercooling the hollow shaft 11 compared to the winding body 20 .

Then, the user performs a step (S60) of generating a thermoplastic composite tube. After opening the upper mold 310, the user takes out the cooled winding body 20. Thereafter, in the step of cooling the winding body (S50), the hollow shaft 11 separated from the winding body 20 is removed.

In this example, since the winding body 20 and the hollow shaft 11 are cooled and a gap is naturally generated between the two, there is an advantage that the user can easily withdraw the hollow shaft 11 from the winding body 20. .

In the step of processing the thermoplastic composite tube (S70), the user cuts and shapes the thermoplastic composite tube obtained in the above step as necessary.

Hereinafter, an example in which the present invention is performed using a hollow shaft different from the above-described example will be described with reference to FIG. 10 . At this time, the same or similar parts as the above example will be omitted in order to avoid redundant description.

10 is a view schematically showing another example of a hollow shaft that can be used in the method of manufacturing a thermoplastic composite tube according to an embodiment of the present invention.

According to this example, in the step (S20) of arranging the hollow shaft in the braiding device, the hollow shaft 12 disposed in the braiding device may be formed by connecting a plurality of thermally expandable members 121.

At this time, the plurality of thermal expansion members 121 may be composed of materials having different coefficients of thermal expansion. Specifically, the thermal expansion member 121 having a larger thermal expansion coefficient may be disposed as it is spaced apart from the center of the hollow shaft 12 toward both ends.

In the step of heating the winding body (S40), the hollow shaft 12 thermally expands and applies a pressure within a predetermined range to each part of the winding body 20. This is because the thermally expandable members 121 are located in the arrangement groove 350 corresponding to the temperature gradient in the heated heating mold 300 . Specifically, in the temperature distribution in the heating mold 300 during the heating process, the temperature at the center of the heating mold 300 becomes higher than the temperature at the outside of the heating mold 300 . Therefore, if a material having a gradually greater coefficient of thermal expansion is placed outside the heating mold 300, a relatively uniform pressure can be applied to the winding body 20.

Hereinafter, an example in which the present invention is performed using a hollow shaft different from the above-described example will be described with reference to FIG. 11 . At this time, the same or similar parts as the above example will be omitted in order to avoid redundant description.

11 is a view schematically showing another example of a hollow shaft that can be used in the method of manufacturing a thermoplastic composite tube according to an embodiment of the present invention.

According to this example, the hollow shaft 13 disposed in the braiding apparatus in step S20 in which the hollow shaft is disposed in the braiding apparatus may include a cooling path 131 formed along the central axis. Hereinafter, for convenience of explanation, the cooling furnace 131 is described based on the fact that it is formed along the central axis of the hollow shaft 11, but the present invention is not limited thereto. The number and formation positions of the cooling furnaces 131 may be variously configured and will be understood by those skilled in the art.

In this example, the user supplies refrigerant to the cooling path 131 using an external cooling device when the winding body is cooled (S50).

The hollow shaft 13 is deprived of heat and thermally contracted, and the heat shrinkage proceeds and the hollow shaft 13 is separated from the winding body 20, similar to the above-described example.

However, in this embodiment, when the hollow shaft 13 and the winding body 20 are cooled, the gap between the two is narrow and it is difficult to withdraw the hollow shaft 13, the user continuously removes the hollow shaft 13. There is a difference in being able to widen the gap between the winding body 20 and the hollow shaft 13 by cooling. This is because the hollow shaft 11 that transfers heat by directly contacting the refrigerant is cooled faster than the winding body 20 .

Because of this, in this example, there is an advantage of being relatively free in selecting the thermal expansion coefficient of the hollow shaft 11 disposed in the step (S20) in which the hollow shaft is disposed in the braiding device.

In addition, in the step of cooling the winding body (S50), the distance between the hollow shaft 13 and the winding body 20 can be spaced as necessary, and the thermoplastic composite tube is generated from the winding body 20 in the step S60. There is an advantage that it is convenient to withdraw the hollow shaft 11.

Hereinafter, an example in which the present invention is performed using a material chamber different from the above example will be described with reference to FIG. 12 . At this time, the same or similar parts as the above example will be omitted in order to avoid redundant description.

In this example, instead of the mixed yarn 7, the user may separately arrange the first material yarn formed of the reinforcing fiber 71 and the second material yarn formed of the thermoplastic resin fiber 72 in the braiding device.

When the user selects the first material chamber and the second material chamber as material chambers, the user places the bobbin wound with the first material chamber and the bobbin wound with the second material chamber in the braiding device. In this case, the user may select a braiding pattern to be wound in consideration of the physical properties of the thermoplastic composite tube to be manufactured, and accordingly arrange the first material chamber and the second material chamber in the braiding device.

Referring to FIG. 12 to help understand the braiding pattern, FIG. 12(a) is a diagram illustrating a 1X1 braiding pattern. 12(b) is a diagram showing a 2X2 braiding pattern. 12(c) is a diagram showing a 3X3 braiding pattern.

At this time, the first yarn 73 shown in FIG. 12 may be any one of the above-described blended yarn 7, the first material chamber, and the second material chamber. In addition, the second yarn 74 may also be any one of the above-described blended yarn 7, the first material chamber, and the second material chamber.

For example, when a user intends to wind the winding body 20 in a 1X1 braiding pattern, the user may arrange one bobbin winding the first material thread and one bobbin winding the second material thread in the braiding device.

Alternatively, when the user intends to wind the winding body 20 in a 2X2 braiding pattern, the user may arrange two bobbins for winding the first material thread and two bobbins for winding the second material thread in the braiding device.

Alternatively, when the user intends to wind the winding body 20 in a 3X3 braiding pattern, the user may arrange three bobbins for winding the first material thread and three bobbins for winding the second material thread in the braiding device.

On the other hand, in the above description, the user took an example of arranging the first material room and the second material room in the braiding device, but the present embodiment is not limited thereto.

As another example, in this example, the user may arrange the mixed yarn 7 and the first material yarn and/or the second material yarn together in the braiding device. At this time, the user may differently set the number of each of the mixed yarns 7, the first material chamber, and the second material chamber arranged with the braiding pattern of the winding body 20 according to the physical properties of the thermoplastic composite tube to be obtained.

For example, if a user intends to manufacture a thermoplastic composite tube having a high weight ratio of reinforcing fibers, the user may wind the winding body 20 by arranging the blended yarn 7 and the first material thread in a braiding device.

Or, as another example, if the user wants to manufacture a thermoplastic composite tube with a high weight ratio of thermoplastic resin fibers, the user may wind the winding body 20 by arranging the mixed yarn 7 and the second material thread in a braiding device. will be.

According to the embodiments of the present invention, since the thermoplastic composite tube is manufactured using a material chamber without using the slit tape 4, there are advantages as follows.

Specifically, the splice portion of the slit tape 4 is vulnerable to torsional moment, and the splice portion is broken during a braiding operation, so that the slit tape has to be relocated to the braiding device in some cases.

On the other hand, the material thread used in the present invention can withstand a relatively strong torsional moment. Therefore, in the case of using the material yarn, the risk of breakage of the braiding base material (here, the material yarn) is low, resulting in excellent continuous winding. Due to this, the present invention has an advantage in that it is convenient to continuously over-braiding until the winding body to be braided has the number and thickness of layers intended by the user.

Those skilled in the art to which the present invention pertains will understand that the present invention can be embodied in other specific forms without changing its technical spirit or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. The scope of the present invention is indicated by the following claims rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included in the scope of the present invention. do.

1: braiding device 2: horn gear
3: bobbin 4: slit tape
5, 6: composite tape 7: blended yarn
11, 12, 13: hollow shaft 20: winding body
71: reinforcing fiber 72: thermoplastic resin fiber
73: first company 74: second company
121: thermal expansion member 131: cooling furnace
300: heating mold 310: upper mold
320: lower mold 330: hot wire
340: cooling line 350: placement groove

Claims (7)

arranging a plurality of material chambers containing thermoplastic resins necessary for manufacturing a thermoplastic composite tube in a braiding device;
Disposing a hollow shaft extending to a predetermined length at the center of the braiding device;
winding the winding body covering at least a part of the surface of the hollow shaft into the material chamber by the operation of the braiding device;
arranging the winding body and the hollow shaft in a heating mold so that the winding body is heated while being supported by the inner wall of the heating mold and the hollow shaft;
cooling the winding body; and
Including; removing the hollow shaft inside the winding body to create the thermoplastic composite tube,
In the step of heating the winding body,
Due to the thermal expansion of the hollow shaft, the winding body is pressed in a radial direction so that the outer surface is plastically deformed smoothly,
In the step of cooling the winding body,
A method of manufacturing a thermoplastic composite tube, wherein a refrigerant is supplied to a cooling path formed inside the hollow shaft so that the hollow shaft is more contracted than the winding body, so that the hollow shaft is cooled more than the winding body. According to claim 1,
The hollow shaft,
Method of manufacturing a thermoplastic composite tube provided with a mandrel made of PTFE so as to apply a pressure of a predetermined size or more to the winding body by thermal expansion in the step of heating the winding body. According to claim 1,
The material room,
A method of manufacturing a thermoplastic composite tube, which is a commingled yarn formed of reinforcing fibers and thermoplastic fibers to enable continuous winding on the hollow shaft in the step of winding the winding body. According to claim 1,
The material yarn includes a first material yarn that is a reinforcing fiber and a second material yarn that is a thermoplastic resin fiber so that continuous winding around the hollow shaft is possible in the step of winding the winding body,
The method of manufacturing a thermoplastic composite tube, wherein the first material chamber and the second material chamber are arranged in the braiding device so that the winding body has a predetermined braiding pattern in the step of winding the winding body. According to claim 1,
The heating mold includes an arrangement groove in which the winding body is disposed and a plurality of hot wires spaced apart from each other by a predetermined distance and disposed to surround the arrangement groove,
In the step of heating the winding body, the heating mold is heated by the plurality of heating wires, the manufacturing method of the thermoplastic composite tube. According to claim 5,
The heating mold includes a plurality of cooling lines positioned between the plurality of heating wires,
In the step of cooling the winding body, the heating mold is cooled using the cooling line to cool the winding body and the hollow shaft. According to claim 1,
The hollow shaft,
Corresponding to the temperature gradient in the heated heating mold so as to apply a pressure within a predetermined range to each part of the winding body by the thermal expansion in the step of heating the winding body, both ends of the longitudinal direction of the hollow shaft from the center side Method for manufacturing a thermoplastic composite tube formed so that the thermal expansion coefficient increases as it is spaced apart.

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