KR101499474B1 - Method for Producing pipe - Google Patents

Abstract

A taping step of placing a plurality of carbon yarns in close contact with the outside of the mandrel; a taping step of placing a compression tape on the outer side of the carbon yarn arranged on the mandrel; and heating the mandrel in a heating furnace to compressively heat the carbon yarn, And a drawing step of separating the compression tape from the molded pipe and separating the pipe from the bare hearth.

Description

[0001] METHOD FOR PRODUCING PIPE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe manufacturing method, and more particularly, to a pipe manufacturing method which is light in weight and can maintain a maximum strength as compared with the prior art.

Currently, pipes are used in various fields. For example, there are fishing rods, golf clubs, badminton, climbing sticks, ski sticks, archery arrows, bicycles, tent poles, kayak and canoe boats, yacht poles, umbrella poles, umbrella poles and parasol poles.

The various types of pipes as described above are conventionally made of a metal material or a glass or carbon material.

For example, in the case of a fishing rod, glass or carbon is mainly used as a main material in the past.

However, the fishing rod made of glass material is advantageous in flexibility and tensile strength, but has a drawback in that it is very heavy in weight. On the other hand, the fishing rod made of carbon material is advantageous in that it is light and has a strong repulsive force due to elasticity. On the other hand, it has a problem that tensile force is very lower than that of a fishing rod made of a glass material, have.

On the other hand, most people who enjoy fishing tend to prefer carbon-type fishing rods that are lighter but more resilient than glass rods, so they are reinforced with various methods in fishing rods made of carbon material Are produced.

A method of manufacturing a fishing rod, that is, a pipe, using a carbon material will be described as follows.

First, the carbon fabric as a raw material is cut to fit the size of the pipe (fishing rod barrel) to be formed, and the cut carbon fabric is closely adhered to the mandrel to be formed into a pipe shape. A mandrel having a carbon cloth tightly adhered in a pipe shape is inserted into a heating furnace to thermally mold the pipe, and the heat-molded pipe is separated from the mandrel, and the desired product is finally manufactured through the cutting process, the joining process and the coating process .

One of the representative methods for reinforcing the strength of the pipe made of the carbon material is as follows. That is, as a kind of aramid fiber, Kevlar (trademark name of a product developed by DuPont), which is made of kalephthalic acid chloride and paraphenylenediamine and has a very high tensile strength and is mainly used as a bulletproof material, is almost generalized in the field of bulletproof materials It is known that a pipe is manufactured by a method in which a fiber is woven with carbon fibers and then heat-molded, or a pipe is manufactured by a method in which a fabric of Kevlar in the form of a fabric is closely contacted with a carbon fabric and heat- It is known that reinforcing the strength of the pipe as a material.

However, in the conventional pipe manufacturing method, since the thickness of the Kevlar fabric woven with the carbon fiber or the Kevlar fabric attached to the carbon fabric is very thick for reinforcing the strength of the pipe, It is difficult to apply the carbon cloth to the work process when the fishing rod barrel is formed into a very thick shape and the carbon fabric is wound eccentrically in the cross section when the fishing rod is wound around the fishing rod, There is a problem in that the pipe (fishing rod) is broken at one of the portions when the crossed portion and the non-crossed portion are subjected to the load.

In addition, since the fabric of Kevlar fabric is heavy and very expensive, the overall strength of the pipe made of carbon material can be improved, but it is not possible to achieve weight reduction which is the most unique characteristic of the pipe made of carbon material However, since the manufacturing cost of the pipe is increased, it gives an economic burden to the general consumers, and there is a problem that the overall practicality is deteriorated except for the strength improvement.

Further, conventionally, there has been a problem in that when the carbon fabric is wound up, if the pipe is wound eccentrically, the load is concentrated on one side, and the pipe is easily broken.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide an improved pipe manufacturing method which can reduce weight while maintaining maximum strength while reducing manufacturing cost.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide an improved pipe for preventing a pipe from being broken by an eccentric load by fundamentally solving the eccentricity generated when carbon fiber is wound by using carbon yarn. And a method for producing the same.

In order to achieve the above object, the present invention provides a pipe manufacturing method comprising: a rolling step of disposing a plurality of carbon yarns in close contact with an outer side of a mandrel; A taping step of disposing a compression tape on the outside of the carbon yarn arranged in the mandrel; Heating the mandrel in a heating furnace to compressively heat the carbon yarn to form a pipe; And a drawing step of separating the compressed tape from the circularly formed pipe and separating the pipe from the mandrel.

The method of claim 1, wherein the rolling step comprises: arranging the plurality of carbon yarns linearly in the longitudinal direction from one end of the mandrel to the other end on an outer peripheral surface of the mandrel; And spirally winding the carbon yarn on the outer surface of the mandrel.

The rolling step may include a step of preparing a mandrel having a groove for pattern formation extending in the longitudinal direction from one end to the other end on the outer circumferential surface and arranging a plurality of carbon yarns in a straight line so as to fill the groove for pattern formation of the mandrel ; And spirally winding the carbon yarn so as to cover the linear carbon yarn.

The mandrel has a shape in which the outer diameter gradually increases from one end to the other end, and the arranging step includes a step of arranging the plurality of carbon yarns linearly in the circumferential direction on the outer circumferential surface of the mandrel at a uniform interval, ; And a further arrangement step of arranging a plurality of carbon yarns linearly from the point where the interval between the carbon yarns arranged in the basic arrangement step is separated to the other end of the mandrel at regular intervals in the circumferential direction, May be formed a plurality of times in a stepwise manner until the gap between the carbon yarns is filled up to the other end of the mandrel.

Further, in the step of spirally winding, it is preferable that the carbon yarn is doubly wound along the spiral direction in each of opposite directions crossing each other.

A polishing step of polishing an outer circumferential surface of the pipe separated from the mandrel; And a painting step of coating the outer periphery of the polished fishing rod with a color and waterproofing liquid.

According to the pipe manufacturing method of the present invention, since the carbon fiber is directly used without using the carbon fabric as in the conventional method, the carbon fiber can be produced by using the carbon fiber, Is cut in accordance with the mandrel, and the cut carbon cloth is wound around the mandrel) can be omitted. Thus, there is an advantage that the manufacturing time can be shortened and the manufacturing cost can be reduced by a simple process.

Further, it is possible to fundamentally solve the problem that an eccentric load is generated by the overlapped portion when winding the carbon fabric in the related art, and there is an advantage that the problem such as the broken pipe due to the eccentric load can be solved.

Therefore, there is an advantage that it is possible to provide a pipe with improved quality at a low price while maintaining a light weight and strength.

In addition, since the pipe is manufactured by a method in which the carbon yarn is woven on the outer surface of the mandrel, the groove can be formed in the longitudinal direction on the outer surface of the mandrel, and after the carbon yarn is partially disposed in the groove, By arranging the carbon yarn as a whole in the mandrel, it is possible to eventually make the entire thickness of the pipe differently. Therefore, it is possible to simultaneously form a protruding pattern extending in the longitudinal direction of the pipe on the inner surface of the pipe. Thus, by integrally forming the protruding pattern on the inner surface of the pipe, the rigidity of the pipe is improved and the bending property (elasticity) is improved, thereby improving the reliability of the product.

1 is a block diagram illustrating a pipe manufacturing method according to an embodiment of the present invention.
Fig. 2 is a perspective view showing a state in which carbon yarn is wound on the outside of the mandrel. Fig.
3 to 6 are schematic views for explaining various embodiments in which carbon yarn is disposed outside the mandrel.
7 is a perspective view showing a state in which a compression tape is taped after a carbon yarn is wound around a mandrel.
Figs. 8 and 9 are views for explaining a method of manufacturing a pipe having a non-round shape in its inner peripheral cross-section by woven carbon yarn on its outer side using different types of mandrels.
10 is a cross-sectional view showing a pipe having a cross-sectional shape different from that of the pipe shown in FIG.

Hereinafter, a pipe manufacturing method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, a pipe manufacturing method according to an embodiment of the present invention includes a rolling step S10, a taping step S20, a heat molding step S30, a drawing step S40, a polishing step S50, A step S60 and a commercialization step S70.

2, an epoxy resin is coated on the surface of the mandrel 100 corresponding to the forming mold, and then carbon yarn 200 (carbon (carbon) is spun on the outer peripheral surface of the mandrel 100) A yarn for weaving a fabric) are arranged in plural layers, that is, wound.

The mandrel 100 has a configuration in which the outer diameter gradually increases from one end 110 to the other end 120.

In the rolling step S10, the carbon yarn 200 is preferably wound on the mandrel 100 having the above-described shape by the following specific method.

3, the carbon yarn 210 is linearly arranged on the outer circumferential surface from one end 110 to the other end 120 of the mandrel 100, and the mandrel 100, (Uniformly) at regular intervals in the circumferential direction.

In this case, the mandrel 100 has a structure in which the outer diameter of the mandrel 100 is increased from one end 110 to the other end 120, so that the carbon yarn 210 is closely attached to one end 110 in the circumferential direction, By arranging them basically, a gap G is generated between the carbon yarns 210 from a predetermined distance.

Then, another carbon yarn 210 'is further disposed up to the other end 120 at a point where the gap G is generated as described above. The carbon yarn 210 'used at this time has a shorter length than the carbon yarn 210 arranged in the basic arrangement step.

In addition, a gap is formed between the carbon yarn 210 'and the carbon yarn 210 disposed basically even when the carbon yarn 210' is disposed closer to the other end 120 by a certain distance. Therefore, by repeating the process of filling the carbon yarn 210 'further shorter than the carbon yarn 210' by repeating the step of filling the carbon yarn 200 in the entire outer circumferential surface of the mandrel 100, So that it can be arranged in a straight line.

Next, in the rolling step S10, after the carbon yarn 210 is linearly arranged as described above, the carbon yarn 220 is wound around the mandrel 100, as shown in FIG. That is, the carbon yarn 200 can be arranged in a plurality of layers by winding the carbon yarn 220 on the outer periphery of the mandrel 100 so as to cover the carbon yarn 210 previously arranged on the outer peripheral surface of the mandrel 100 , The thickness thereof, that is, the number of layers is not limited, and can be variously selected depending on the application field and size in which the pipe is used.

There are fishing, golf clubs, badminton, climbing sticks, ski sticks, archery arrows, bicycles, tent poles, kayak and canoe boats, yacht poles, umbrellas, umbrella poles and parasol poles. It can be applied to various fields.

That is, in the rolling step S10, the thickness of the pipe is adjusted (adjusted). For example, when a relatively thin thickness portion such as a pellet of a fishing rod is formed, only one layer of carbon yarn 200 is used, . 4 and 5, when the carbon yarn 200 is wound around the mandrel 100 in a plurality of layers, the carbon yarn 200 is formed into a dull shape, as shown in FIGS. 4 and 5 .

The wound carbon yarn 220 may be spirally wound on the outer side of the mandrel 100 as shown in Fig. 4, or may be wound in the form of a ring-shaped band as shown in Fig. Further, as shown in Fig. 6, even in the case of winding in the spiral shape, it can also be expressed in a zigzag manner in a plan view by winding in a spiral manner in two directions intersecting each other.

In the embodiment of the present invention, the carbon yarn 210 is arranged in a straight line, and then the carbon yarn 220 is spirally wound on the carbon yarn 210 to form a laminate. However, this is merely an example, May be mutually exchanged, and can be selected and applied selectively.

After the carbon yarn 200 is placed on the mandrel 100 as described above, a taping step S20 is performed to wind the compression tape 300 (see Fig. 6) on the outer side of the carbon yarn 200 . At this time, because the adhesive is adhered to the portion where the compressed yarn is in contact with the carbon yarn 200, the compressed tape plays a role of bonding the carbon yarn 200 while pressing them. At this time, generally, when the carbon yarn 200 is heat-treated, it is preferable that the heat shrinkable film (compression tape) is spirally taped so as to be more uniformly compressed.

After the taping step S20 as described above, the mandrel 100 wound with the carbon yarn 200 is placed in a heating furnace (not shown) and heated at a temperature of about 100 deg. So that the carbon yarn 200 is formed into a pipe by heat, and a heating molding step S30 is performed so as to maintain predetermined strength and elasticity. The thermoplastic resin contained in the carbon yarn 200 is thermally expanded and molded together with the carbon through the heat molding step S30 and the remaining amount of the resin liquid flows out between the gaps of the molding compression tape 300, .

Meanwhile, the heat molding temperature and the heat molding time may be variously changed according to the application field and the application field of the pipe.

Next, after the heat-molding step (S30), the drawing step (S40) is performed. In the drawing step S40, the heat-molded pipe is separated from the mandrel, and the compression tape 300 is peeled off from the pipe.

Next, in the polishing step (S50), the outer periphery of the pipe pulled out as described above is smoothly polished by using a polishing apparatus (not shown). That is, the adhesive tape of the pressure tape and the rugged surface formed by the resin molding are smoothly polished when the compression tape 300 is wound while being heated.

After the polishing step (S50), the coating step (S60) of forming the paint layer by applying paint, pearl powder or sticker or the like to the surface of the pipe repeatedly several times by using a brush or using spray It goes through. At this time, the waterproofing and strength enhancement of the pipe can be promoted through the painting, and the visual aesthetics of the pipe can be realized with added color. In addition, it is possible to apply the liquid necessary for various coatings, and the concrete example of the coating step S60 does not limit the present invention.

Finally, after the coating step (S60), the pipe is cut according to application specific standards, and the cut parts are connected and assembled to finally produce a desired product (S70). The above-described commercialization step (S70) can be easily understood by those skilled in the art from commonly known technologies known for each application field, and thus a detailed description thereof will be omitted.

 In the meantime, in the pipe manufacturing method described in the embodiment of the present invention, a pipe having a shape in which its outer diameter gradually decreases from one end to the other end has been described as an example, but this is merely an example, It is to be understood that the pipe having the structure of the present invention can be manufactured by the same manufacturing method.

Further, it should be understood that the cross-sectional shape of the pipe can be variously implemented in a circular shape, a non-circular shape, and the present invention is not limited to the cross-sectional shape.

Another embodiment of the rolling step S10 will be described with reference to FIGS. 8 and 9. FIG. That is, referring to FIG. 8, a groove 101 for forming a pattern is formed on the outer circumferential surface of the mandrel 100 'from one end 110 to the other end 120 of the mandrel 100' along the circumferential direction. The carbon yarn 200 is disposed on the outer surface of the mandrel 100 'so as to cover the outer surface of the mandrel 100' having such a configuration, thereby woven the pipe. Specifically, the carbon yarn 210 is linearly arranged in the groove portion 101 of the mandrel 100 'to fill the groove portion 101 with the carbon yarn 210 first. The groove portion 101 is filled with the carbon yarn 210 so as to have a height (thickness) corresponding to the outermost side of the mandrel 100 ', and then the carbon yarn 210 is wound around the carbon yarn 210 in a circular, spiral or zigzag manner, (220) is disposed outside the carbon yarn (210). Of course, when the carbon yarn 210 is arranged in a straight line, it is basically arranged to fill the groove 101, and then the carbon yarn 210 is linearly formed so as to cover the entire outer surface of the mandrel 100 ' It is also possible to arrange the carbon yarn 220 so as to cross the carbon yarn 210 finally after further arranging the carbon yarn 210 to a predetermined thickness. After performing the rolling process in which the carbon yarn 200 is placed outside the mandrel 100 'having the groove portion 101 by the above-described method, after passing through the steps S20, S30, and S40, The drawn pipe 400 is formed with a protruding pattern 403 protruding in the longitudinal direction of the pipe 400 on the inner surface 401 thereof. By forming the protrusion pattern 403 integrally from the inner surface 401 of the pipe 400 to the other end of the pipe 400 as described above, the rigidity of the pipe 400 can be improved and the elasticity The reliability of the product can be improved. That is, conventionally, since a pipe is manufactured by using a method of winding a woven fabric directly on a mandrel, it has been very difficult to form a protrusion pattern for improving the rigidity on the inner surface of the pipe. However, If the pipe 400 is manufactured by directly weaving the yarn 200, it is possible to manufacture the inner surface of the pipe 400 in various shapes. That is, as shown in FIG. 10, it is also possible to manufacture the pipe 400 'having the internal surface 405 formed in a comb-like pattern in the longitudinal direction, and also to process the inner surface of the pipe in various patterns , It is possible to improve not only the stiffness of the finished and finished pipe but also the bending property (elasticity), and the stiffness can be further improved while the thickness thereof is made thinner than the conventional one. There is an advantage to be able to.

On the other hand, in the embodiment of the present invention, the meaning of rolling in the rolling step is to be understood as meaning including both a manner of winding the carbon yarn outside the mandrel and a method of directly knitting the carbon yarn on the mandrel.

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. Those skilled in the art will readily appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims.

100,100 '.. Mandrel
200, 210, 210, 220 ... Carbon yarn
300 .. Compression tape
400 .. pipe

Claims (6)

delete delete A rolling step of placing a plurality of carbon yarns in close contact with the outside of the mandrel;
A taping step of disposing a compression tape on the outside of the carbon yarn arranged in the mandrel;
Heating the mandrel in a heating furnace to compressively heat the carbon yarn to form a pipe;
And a pulling step of separating the compressed tape from the formed pipe and separating the pipe from the mandrel,
Wherein the rolling step comprises:
Preparing a mandrel in which a pattern forming groove portion extending in a longitudinal direction from one end to the other end is formed in an outer peripheral surface, and arranging a plurality of carbon yarns in a straight line so as to fill the pattern forming groove portion of the mandrel;
And spirally winding the carbon yarn so as to cover the linear carbon yarn. delete delete delete

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