JP3770335B2 - Manufacturing method of lure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a process for producing a lure, in particular, to a method of producing a metal lure by forging.
[0002]
[Prior art]
Lures with complex metal shapes are conventionally manufactured using a bulge forming method. In the bulge forming method, a tubular material is disposed in a two-part mold, and a lure is produced by inflating the material by applying water pressure to the inside of the material while pressing the mold with a hydraulic press. However, in order to manufacture a lure by the bulge forming method, an expensive water pressure generator or a hydraulic press machine is required. Therefore, the bulge forming method is often used to manufacture a high-quality lure with high added value. For this reason, other metal lures are generally manufactured by welding or bonding two symmetrical parts.
[0003]
[Problems to be solved by the invention]
When a lure is manufactured by splitting into two parts, the respective parts have to be manufactured by die forging using, for example, a mold, and then they must be positioned and matched, which complicates the manufacturing process. Further, in order to prevent positional displacement when the left and right parts are combined, it is necessary to accurately position and manufacture the left and right parts. For this reason, the respective molds for manufacturing the left and right parts must be precise, which increases the cost of the molds.
[0004]
An object of the present invention is to simplify the manufacturing process and to manufacture a metal lure without using a precise mold.
[0005]
[Means for Solving the Problems]
The lure manufacturing method according to the first aspect of the present invention is a method for manufacturing a lure having a cavity therein, and includes an arranging step, a forging step, a liquid draining step, and a painting step . An arrangement | positioning process is a process of arrange | positioning the solid which becomes a liquid at normal temperature inside a metal cylindrical raw material. The forging step is a step of die forging the material into a desired shape so that the bottomed bottom portion of the material on which the solid is disposed is the head side of the lure, and a hole is formed in the tail portion of the lure . The liquid draining process is a process of liquefying the solid inside the lure obtained by the forging process and extracting it from the punched hole. The painting process is a process in which the surface of the lure is painted to close the hole.
[0006]
Here, since a solid that is liquid at room temperature is disposed inside the material, even if the material is pressed from the surface in the forging process, a drag is easily generated inside the material. For this reason, the lure of the shape along the type | mold can be obtained by a simple manufacturing process, without using a precise type | mold. Also, if the temperature is returned to room temperature or higher, the internal filling can be easily removed. In addition, since there is no excess inside the lure, the quality of the lure is improved.
[0007]
The method for producing a lure according to a second aspect of the present invention is the method according to the first aspect, wherein the arranging step includes a filling step of filling the material with a liquid, and a cooling step of solidifying the liquid by cooling the material filled with the liquid. Is included. In this case, since the solid is disposed in the material by cooling the material filled with the liquid, the solid can be disposed in the material without a gap without being processed into a shape suitable for the material.
[0008]
The method for producing a lure according to the invention 3 further includes a heat treatment step of hardening the lure obtained in the forging step by heat treatment in the method described in the invention 1 or 2 . In this case, since the lure is cured, the mechanical strength of the obtained lure is improved.
[0009]
The lure manufacturing method according to the invention 4 is a method for manufacturing a lure having a cavity therein, and includes a filling step, a solidifying step, a forging step, a liquid draining step, and a coating step . The filling step is a step of filling a liquid into a bottomed cylindrical material made of metal. The solidification step is a step of turning the liquid filled in the material into a solid. The forging step is a step of die forging the material into a desired shape so that the bottomed bottom of the material filled with the solid is the lure head side and a hole is formed in the tail of the lure . The liquid draining process is a process of liquefying the solid inside the lure obtained by the forging process and extracting it from the punched hole. The painting process is a process in which the surface of the lure is painted to close the hole.
[0010]
In this case, after filling the material with liquid, it is cooled to solidify the liquid inside, and the material filled with the solid is die-forged. The die can be forged, and even if the material is pressed from the surface, a drag is more easily generated inside. For this reason, the lure of the shape along the type | mold can be obtained by a simple manufacturing process, without using a precise type | mold.
[0011]
A method for producing a lure according to a fifth aspect of the present invention is the method according to any one of the first to fourth aspects, wherein the liquid is a liquid containing water. In this case, the solid can be easily placed inside the material with no gaps using cheap and easy-to-handle water.
[0012]
The lure manufacturing method according to the invention 6 is the method according to any one of the inventions 1 to 5 , wherein the material is made of aluminum. In this case, a lure having a complicated shape such as a lure can be easily obtained from an aluminum material having high malleability.
[0013]
The lure manufacturing method according to the invention 7 is a method for manufacturing a lure having a cavity therein, and includes a filling step, a cooling step, a forging step, a liquid draining step, and a coating step . The filling step is a step of filling a metal with a bottomed cylindrical material with water. The cooling step is a step of cooling the material to turn water into ice. The forging step is a step of die forging the material into a desired shape such that the bottomed bottom portion of the material filled with ice is the head side of the lure and a hole is formed in the tail portion of the lure . The liquid draining process is a process in which ice inside the lure obtained by the forging process is made into water and extracted from the punched hole. The painting process is a process in which the surface of the lure is painted to close the hole.
[0014]
In this case, since the inside of the raw material is filled with water without gaps and is forged by water, post-processing of the processed water and the raw material becomes easy.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a flowchart showing a manufacturing procedure of a metal lure as a hollow article manufactured by a method of manufacturing a lure according to an embodiment of the present invention.
[0016]
In FIG. 1, in order to manufacture a metal lure, a bottomed cylindrical material pipe 10 is first obtained from an aluminum rod by, for example, deep drawing or boring. In step S1, water is poured to the opening to fill the material pipe 10 with water. In step S2, the material pipe 10 filled with water is cooled to solidify the internal water into ice. As a result, the ice 11 is arranged inside the material pipe 10 along the inner shape without any gap. In step S3, the material pipe 10 in which the ice 11 is arranged is arranged on the lower mold 13 of the upper and lower molds 12 and 13. Here, a space 14 is formed between the molds 12 and 13 so that the outer shape of the metal luer can be formed during mold matching. When the material pipe 10 is arranged on the lower mold 13, the bottom of the thick material pipe 10 is arranged on the head side of the space 14 in order to make the metal luer head heavy. Then, the upper die 12 is lowered and the die is forged together with the lower die 13. During this die forging, a part of the compressed internal ice 11 is ejected as water from the tail, for example. When die forging is completed, a luer body 2 as shown in FIG. 2 is formed.
[0017]
In step S4, the ice crushed inside is used as water to drain water from the tail hole 2a (FIG. 2) of the lure body 2. Finally, in step S5, for example, an aluminum alloy is subjected to heat treatment such as T6 treatment to be cured and dried. Thereby, the lure body 2 is almost completed. After that, the surface is coated to close the punched hole 2a and make the surface more conspicuous. In addition, a lure is completed by attaching a split ring or hook (fishing hook).
[0018]
The metal luer 1 thus completed has a streamlined lure body 2 resembling a fish such as a small fish, as shown in FIG. The lure body 2 is a hollow body having a cavity 3 inside the aluminum made by the manufacturing process described above. On the surface of the lure body 2, a pattern resembling a fish is painted.
[0019]
A flat water receiving portion 9 extending obliquely is provided from the top surface of the lure body 2 to the top surface of the trunk portion. The water receiving portion 9 is provided for the lure 1 to receive a resistance of a water flow underwater and to make a small fish swim with its tail swinging from side to side. A through-hole 4 for attaching a line (fishing line) or a snap swivel and through-holes 5 and 6 for attaching hooks are formed in the center of the upper part of the lure body 2 behind the water receiving part 9 and at the front and lower part of the lower surface. Has been. Three through-holes 4 are provided side by side with the luer body 10 approximately right above the center of gravity. A line is bound to one of the through holes 4 directly or via a snap swivel in a knot manner such as a loop knot when used. When the fishing line is bound to the central through hole 4, the lure 1 maintains a forward tilted posture in which the head is slightly sunk by the action of the water receiving portion 9 in water. Further, when the lines are bound to the left and right through holes 4, a forward inclined posture and a slightly backward inclined posture are obtained. Hooks (fishing hooks) 7 and 8 are attached to the through holes 5 and 6 via split rings 5a and 6a.
[0020]
In such a lure 1, since the luer body 2 is a hollow body, the overall specific gravity is reduced by the amount of the hollow 3 inside compared to a solid body. For this reason, compared with a solid thing, the size of an external shape and an application are hard to be limited.
[0021]
Moreover, the weight of the head can be freely adjusted by changing the thickness of the bottom portion of the material pipe 10, and the front-rear balance can be freely changed according to the use of the lure.
[0022]
In addition, a lure in which two or more parts are joined has a large closing margin to be sealed in the case of a product that requires airtightness, and smoothness of the joining surface is also required. Furthermore, when the product is a strength member, the joint surface becomes a problem in strength. However, since the lure manufactured in this embodiment is forged from the material pipe, the closing allowance is reduced and the smoothness thereof is also increased. Moreover, since there are few joint parts, the problem on intensity | strength hardly arises.
[0023]
【Example】
As the material pipe 10, a bottomed pipe made of aluminum having an outer diameter of 16.8 mm, a length of 70 mm, an inner diameter of 14 mm, and a bottom thickness of 5 mm is prepared. Obtained. For comparison, the mold was forged with no water in it and the inside remained hollow. Further, a solid round bar having the same outer diameter was die forged. In addition, the force required at the time of forging with respect to each raw material was 294 kN, 294 kN, and 1962 kN, respectively.
[0024]
The result of tracing the external accuracy of the lure body after forging is shown in FIG. Here, FIG. 3 (a) shows an outline traced up and down at 20mm from the head, and FIGS. 3 (b), (c) and (d) trace up and down at 30, 46 and 64mm from the head, respectively. The outer shape is shown. Further, the solid line shows the inner wall of the mold and the outer shape when forged according to the present embodiment and when a solid material is forged. The dotted line shows the outer shape when the hollow pipe material is forged without filling anything. Here, as is clear from FIG. 3, the solid shape and the shape according to the present embodiment form the outer shape along the mold with almost no error, but in the comparative example shown by the dotted line that does not fill anything inside. Things do not follow the inner wall of the mold, and there is a gap between them.
[0025]
Thus, it was found that when the ice was filled into the pipe material 10 and forged, a lure having a precise outer shape along the mold was obtained.
[0026]
Other Embodiment
(A) Instead of water, another liquid may be filled.
[0027]
(B) Instead of cooling the ice after filling it with water and placing the ice in the material pipe, it is possible to make ice that matches the inner shape of the material pipe and insert it into the material pipe.
[0028]
(C) The water draining step and the heat treatment step may be omitted.
[0029]
【The invention's effect】
In the lure manufacturing method according to the present invention, since a solid that is liquid at room temperature is arranged inside the material, even if the material is pressed from the surface in the forging process, a drag is easily generated inside the material. For this reason, the lure of the shape along the type | mold can be obtained by a simple manufacturing process, without using a precise type | mold. Also, if the temperature is returned to room temperature or higher, the internal filling can be easily removed.
[Brief description of the drawings]
FIG. 1 is a flowchart showing an implementation procedure according to an embodiment of the present invention.
FIG. 2 is a side view of a metal lure obtained by the method of the present invention.
FIG. 3 is a schematic diagram showing a gap with a metal luer mold manufactured by various manufacturing methods.
[Explanation of symbols]
1 Metal luer 2 Luer body 3 Cavity 10 Pipe material 11 Ice 12 Upper mold 13 Lower mold S1 Water filling process S2 Cooling process S3 Forging process S4 Water draining process S5 Heat treatment process

Claims (7)

A method for producing a lure having a cavity inside,
An arrangement process of arranging a solid that becomes liquid at room temperature inside a metal bottomed cylindrical material,
A forging step in which the material is die-forged into a desired shape so that the bottom with the bottom of the material on which the solid is disposed is the head side of the lure, and a hole is formed in the tail of the lure ,
A liquid draining step for liquefying the solid inside the lure obtained by the forging step and extracting the solid from the hole;
A painting process for coating the surface of the lure and closing the hole;
A method for manufacturing a lure including: The lure manufacturing method according to claim 1, wherein the arranging step includes a filling step of filling the material with a liquid and a cooling step of cooling the material filled with the liquid to solidify the liquid. The manufacturing method of the lure of Claim 1 or 2 which further includes the heat processing process which heat-processes and cures the lure obtained by the said forge process. A method for producing a lure having a cavity inside,
A filling process for filling a metal with a bottomed cylindrical material with a liquid;
A solidification step of solidifying the liquid filled in the material;
A forging step of die forging the material into a desired shape so that a bottomed bottom portion of the material filled with the solid is the head side of the lure, and a hole is formed in the tail portion of the lure ;
A liquid draining step for liquefying the solid inside the lure obtained by the forging step and extracting the solid from the hole;
A painting process for coating the surface of the lure and closing the hole;
A method for manufacturing a lure including: The method for producing a lure according to any one of claims 1 to 4 , wherein the liquid is a liquid containing water. The lure manufacturing method according to any one of claims 1 to 5 , wherein the material is made of aluminum. A method for producing a lure having a cavity inside,
A filling step of filling a metal with a bottomed cylindrical material with water,
A cooling step of cooling the material to turn the filled water into ice;
A forging step of die forging the material into a desired shape such that the bottomed bottom of the material filled with ice is the head of the lure and a hole is formed in the tail of the lure ;
A liquid draining step of making ice inside the lure obtained by the forging step into water and extracting from the hole,
A painting process for coating the surface of the lure and closing the hole;
A lure manufacturing method comprising:

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