KR20030005680A - Method for manufacturing arrow shaft - Google Patents

Abstract

PURPOSE: An arrow fabricating method and an arrow fabricated by the same are provided to maintain an initial linear characteristic of the arrow by stacking an elastic sheet member on a mandrel and depositing a non-elastic fiber on the elastic sheet member. CONSTITUTION: A first elastic sheet(102), a second elastic sheet(104) and a non-elastic fiber sheet(106) are cut into predetermined sizes. Then, after performing a prepreg treatment with respect to the first elastic sheet(102), the second elastic sheet(104) and a non-elastic fiber sheet(106), the first elastic sheet(102), the second elastic sheet(104) and a non-elastic fiber sheet(106) are stacked on a surface of a mandrel. The first and second elastic sheets(102,104) include carbon or glass fiber sheet. The non-elastic fiber sheet(106) includes natural fiber or chemical fiber sheet. The first elastic sheet(102) has a cylindrical shape, and the second elastic sheet(104) is bonded to an outer peripheral surface of the first elastic sheet(102). The non-elastic fiber sheet(106) is bonded to an outer peripheral surface of the second elastic sheet(104).

Description

Arrowhead manufacturing method and the arrowhead manufactured by the above method {METHOD FOR MANUFACTURING ARROW SHAFT}

The present invention relates to an arrowhead manufacturing method, and more particularly, to an arrowhead whose surface is made of inelastic fibers and a manufacturing method thereof.

Typically, the arrow is composed of a pipe-shaped arrowhead, an arrowhead fitted into the tip hole of the arrowhead, a plurality of feathers attached to the outer peripheral surface of the rear end of the arrowhead, and a needle inserted into the rear hole of the arrowhead, as shown in FIG. Among them, the shaft is emerging as the most important component.

Therefore, the methods and materials for manufacturing the arrowheads are now widely developed and implemented. Among them, the arrowheads are referred to as "cutting process → lamination / winding process → taping process → heat treatment / cooling process → decentering process → polishing process". The manufacturing method is the most typical method.

However, the method of manufacturing an arrow as described above has many problems as follows.

First, the arrowhead was formed by laminating carbon or glass fiber on a mandrel to use a constant spin, and then grinding it to have a constant diameter and bend. However, the above-described method generates an error no matter how precisely the grinding is performed, and also causes a breakage of the material in the process of grinding the first material, which leads to a decrease in strength. There are disadvantages.

Secondly, since the arrowhead is adjusted in advance before grinding, and then the grinding process is performed, the straightness before grinding is scattered, so that the defective rate is high. In particular, there is a problem in that the eccentricity occurs in the grinding process.

Thirdly, since the material of the shaft (carbon or glass fiber) is laminated in a larger amount than the bend in consideration of the amount of grinding, the cost of the product is increased, and the surface of the shaft is broken and thus cannot be used for a long time.

Fourthly, after the shaft's bend and diameter are determined, the weight of the shaft can't be changed because it is automatically determined by its elasticity and specific gravity.In particular, after the grinding process, the weight of the shaft can be There is a disadvantage that cannot be changed.

Fifthly, the conventional manufacturing method is of course unnecessarily because the strength is lowered by grinding the material having elasticity, and because the characteristic of the arrow has to be designed by using a transfer process or printing or sticky on the arrow to camouflage. This adds to productivity and lowers product costs.

Sixth, when the above-described transfer process is performed, irregularities are formed on the surface of the shaft due to variations in the thickness of the transfer, and there is a disadvantage that the transfer portion is separated when used for a long time.

Seventhly, the arrowhead manufactured by the conventional method has a problem in that, when the material is damaged, the material has a unidirectional elasticity, and the sharp tissue is exposed to cause fatal injury to the body.

Therefore, an object of the present invention for solving the above problems is to calculate the amount of elastic sheet material, such as carbon or glass fiber, which determines the deflection of the shaft, in advance, the amount suitable for the deflection, laminated to the mandrel and the impact on the bend in the upper layer The present invention provides a shaft prepared by laminating non-elastic fibers and a method of manufacturing the shaft.

Another object of the present invention is to provide an arrowhead and a method for manufacturing the same that can maintain the initial straightness because the inelastic fibers are ground.

Still another object of the present invention is to provide an arrowhead and a method of manufacturing the same, which can maintain the flexure of the arrowhead uniformly.

Another object of the present invention is to provide a manufacturing method that can adjust the weight of the shaft by adjusting the grinding amount of the inelastic fibers.

Still another object of the present invention is to provide a method of manufacturing an arrowhead that can implement a design on the surface of the arrowhead by the printing method and an arrowhead manufactured by the method.

The present invention according to the first aspect for achieving the above object in the step of laminating the elastic sheet material along the outer circumferential surface of the mandrel, when the elastic sheet material is laminated on the outermost surface of the mandrel fiber organization An arrowhead manufactured by laminating and winding the inelastic sheet material thus obtained and a method of manufacturing the arrowhead were implemented.

At this time, more preferably, the inelastic sheet is a fibrous natural fiber or cotton or chemical fiber material.

1 is a view showing a method of bonding the foundation to the outer peripheral surface of the mandrel during the manufacturing step of the arrow according to an embodiment of the present invention.

Figure 2 shows a cross section of the shaft produced by the method of the present invention.

3 is a view showing the configuration of an arrow that is commonly used.

<Description of the symbols for the main parts of the drawings>

100: mandrel 102: first elastic sheet

104: second elastic sheet 106: inelastic fiber sheet

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

First, the arrowhead manufacturing method of the present invention implemented in the present invention by prepreg treatment of non-elastic fibers, preferably natural fibers or cotton or chemical fibers organized on the fiber sheet on the elastic sheet, such as prepreg treated carbon or glass fiber After adhering, they are laminated on a mandrel, followed by a taping step → heat treatment / cooling step → decentering step → polishing step, which is a normal step.

1 is a view showing a laminating winding process which is a core process of the present invention among the above-described arrowhead manufacturing process. Referring to FIG. 1, in the method to be implemented in the present invention, the first elastic sheet 102, the second elastic sheet 104, and the non-elastic fiber sheet 106 are cut by a predetermined length, and then prepreg treated them. Next, a step of laminating and winding the surface of the mandrel 100 is performed.

In this case, the first elastic sheet 102 and the second elastic sheet 104 is an elastic material, preferably a sheet of carbon or glass five material, it may be used selectively or two materials overlapping. In addition, the inelastic fibrous sheet 106 refers to a fibrous material, and in detail, refers to a natural fiber or cotton or chemical fiber sheet, and may selectively print various patterns for camouflage treatment of a bowel to the aforementioned fiber.

On the other hand, the configuration of the arrow 200 manufactured by the above-described laminated winding process has a first elastic sheet 102 of the cylindrical type with respect to the center point as shown in Figure 2, the first elastic sheath 102 The second elastic sheet 104 is bonded to the outer circumferential surface. In addition, the non-elastic fiber sheet 106, preferably the printed fibers are bonded to the outer circumferential surface of the second elastic sheet 104. The shaft 200 having such a configuration can solve the above-described problems, and in particular, the weight of the shaft can be adjusted, there is an advantage that can continue to maintain the first straightness.

Hereinafter, the present invention will be described in detail based on the preferred embodiment of the present invention, but the present invention is not limited to the embodiment.

{Example 1}

The release agent was applied to the entire outer circumferential surface of the mandrel to facilitate demolding, and then an adhesive was applied thereon. And the carbon sheet and the glass fiber sheet and the natural fiber sheet treated with printing in various patterns were cut by a predetermined length. In this case, the carbon sheet, the glass fiber sheet, and the natural fiber sheet are prepreg treated.

Then, they are bonded in the order of carbon sheet → glass fiber → natural fiber sheet as shown in Fig. 1, and then they are bonded around the surface of the mandrel, preferably the end of the carbon sheet described above is bonded to the surface of the mandrel. Next, lamination and winding were performed by a rolling apparatus (not shown). (Hereinafter, referred to as a "rolling process")

Next, a film winding process was performed on the surface of the resultant product of the above-described rolling process, preferably on the surface of the natural fiber sheet using a taping device (not shown). In this case, the film is most preferably a PET film or an OPP film. On the other hand, the taping process described above is a process performed immediately before molding a product that has undergone a rolling process to discharge air remaining between the sheets to the outside and to increase the degree of internal lamination of the product.

Subsequently, the mandrel on which the above-mentioned taping process is performed is gradually changed in temperature for 4 hours while the mandrel on which the sheet layer is laminated is molded at a temperature of 80 to 150 ° C. for 1 to 4 hours, and then the mandrel is demolded. I was.

Next, the both ends of the demolded product is cut from the mandrel to have a length of about 825 mm, and then the above film is stripped, and the surface of the natural fiber sheet is polished by a centerless polishing process, thereby completing the manufacturing process of the shaft. It became.

As described above, the manufacturing method of the shaft according to the embodiment of the present invention achieves many effects as follows.

Firstly, the present invention can manufacture an arrowhead without deviation of the bow by calculating an elastic material for determining the bow of the bow, and laminating only an amount suitable for the bow, and bonding an inelastic fiber having no influence on the bow. There is an advantage to that.

Secondly, since the present invention polishes the inelastic material, the weight of the shaft can be adjusted according to the amount of polishing, and the surface is smoothed and the feel of the surface is smooth. There is an advantage to maintain.

Third, the present invention can implement the camouflage of the shaft by printing various patterns on the inelastic fibrous tissue, which can solve the problem of increasing the productivity and the price of the product due to the conventional transfer process at once. It works.

Fourthly, the present invention has an advantage of protecting the body by preventing the sharp tissue from being exposed to the outside because the tissue covers the damaged surface even if the shaft is damaged.

Fifthly, the present invention has a synergistic effect of reducing the cost of the product and improving productivity because the non-elastic fibers of low cost are polished without polishing the high cost elastic material.

Claims (7)

In the conventional arrowhead manufacturing method comprising the step of laminating the elastic sheet material along the outer peripheral surface of the mandrel, When the elastic sheet material is laminated on the outer circumferential surface of the mandrel, the manufacturing method of the shaft comprising the step of laminating the inelastic sheet material on the outermost side, and then wound. The method of claim 1, wherein the inelastic sheet is a fibrous sheet material. The method of claim 2, wherein the inelastic sheet is natural fiber or cotton or chemical fiber. The method of claim 1, wherein the non-elastic sheet is a material in which various patterns are printed by printing. A shaft prepared by the method of any one of claims 1 to 4. In the shaft made of elastic sheet material such as carbon or glass fiber, An arrowhead, characterized in that the non-elastic sheet material is attached to the outer peripheral surface of the elastic sheet. 7. The shaft of claim 6, wherein the inelastic sheet is a fibrous natural fiber or cotton or chemical fiber.