JP2840633B2 - Manufacturing method of metal bat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a metal bat, and more particularly, to a method for manufacturing a metal bat in which a hollow end portion or a hitting portion is filled with a weight sound absorbing material.

[0002]

2. Description of the Related Art There is a social demand for a metal bat to mute the sound of a metal when struck.

[0003] On the other hand, there is also a demand for a bat having a heavier tip end to increase the head speed.

For this reason, conventionally, when a sound deadening material or a weight adjusting material is put into a hollow bat before closing both ends of the metal bat, the sound bat is inserted from the butt tip before head spinning processing or the butt rear end before grip end welding. There were only two ways to enter.

[0005] Further, when a sound deadening material or a weight adjusting material is inserted from the rear end of the hollow bat, it is impossible to insert a large material because the hole before welding is small.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, an object of the present invention is to provide a method for manufacturing a metal bat in which various weight sound-absorbing materials can be put in the hollow end of the metal bat. Things.

[0007]

SUMMARY OF THE INVENTION The present invention, in order to achieve the above object, comprises a step of finishing a hollow circular tube of an aluminum alloy by swaging, head spinning and quenching to finish the product by product finishing. In the method of manufacturing a pad, the head spinning process includes a step of piercing the hole at the foremost portion of the pad base material whose end is closed, and inserting an elastic plate from the pierced hole into a distal end portion in the hollow circular tube. A method for manufacturing a metal bat, comprising the steps of: filling a tip of a hollow circular tube from the hole with a weight silencer through the hole; and fitting the hole with a plug that can be identified by coloring the hole. .

[0008]

[Operation] Since the present invention is configured as described above, the rotational speed is high due to the moment of inertia and the head speed is increased when hitting, so that the flight distance is extended. Also, the weight is adjusted to adjust the desired weight and the degree of balance. Further, since the filler is visible from the external hole, if this is colored by weight, the bat can be easily identified.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a flow sheet showing a method for manufacturing a metal bat of the present invention, and FIG. 2 is a side view of an embodiment including a partially cutaway cross section of the metal bat according to the method of the present invention. FIG. 6 is a cross-sectional view of a tip portion of the metal bat illustrating a manufacturing process of the embodiment.

A method of manufacturing a metal bat is as follows. A hollow circular tube obtained by “extrusion drawing” of an aluminum alloy material is subjected to “swaging” by a large-diameter hitting portion 1 and a small-diameter grip portion 2.
And a tapered portion 3 between them are formed. After that, the tip is closed by "head spinning" and a grip end is formed to form a bat base material 4.
This is to perform a degree of “quenching”.

After the quenching process, a normal metal bat is manufactured by performing “product processing” such as welding of a grip end portion, buffing, and anodizing anodized aluminum to produce a predetermined metal bat. Has added two processing steps during this time, a "most advanced hole drilling step" and a "weight silencer filling step".

First, in the "most advanced hole drilling step", as shown in FIG. 3, a hole 6 is drilled in the most advanced portion 5 of the bat base material 4 closed by head spinning. Hole size is bat base material 4
In the case of a hard metal bat, it may be a relatively large hole which is smaller than the large diameter by about 20 mm, though it depends on the material to be put inside.

Next, as shown in FIG. 4, an elastic plate 8 is inserted from the perforated hole 6 into the tip of the bat hollow 7. This step requires that the plate 8 be elastic. The reason is that the bat base material 4 has a size substantially the same as the inner diameter of the bat base material 4 and needs to be inserted in a compressed state from the hole. As the elastic plate 8, a material obtained by solidifying soft polyurethane foam waste with a resin is used.

Next, as shown in FIG. 5, with the foremost end 5 of the bat base material 4 facing upward, the hole 6 is inserted into the upper part of the elastic plate 8, that is, into the hollow surrounded by the elastic plate 8 and the foremost end 5. The weight silencer 9 made of rubber-like elastic material is filled. As the weight silencing material 9 used in this step, a material in which a filler for weight adjustment or silencing is added to a thermoplastic resin, a thermosetting resin, rubber, or the like as necessary can be used. Are also preferred.

When the weight sound-absorbing material 9 to be filled is made of a solidified liquid such as a hard polyurethane resin, the bat base material 4 is filled with the foremost end 5 facing upward, and the hole 6 is inserted with a plug 10. After the step, the air bubbles are floated toward the elastic plate 8 with the foremost end 5 of the bat base material 4 facing downward as shown in FIG. 6 to solidify the hard polyurethane resin.

The stopper 10 is a formed product obtained by solidifying polyurethane or the like, and is colored in advance by weight.
For example, black is used for heavy-weight bats, blue is used for medium-weight bats, and red is used for light-weight bats.

The metal bat thus obtained is
When the weight of the tip became heavy and the bat was shaken, the head speed was increased and the flight distance of the ball could be extended, and the metal sound when hitting the ball could be softened.

FIG. 7 is a sectional view of a tip portion of a metal bat showing another embodiment.

In the case of this embodiment, a hole 16 is formed in the foremost end 15 of the bat base material 14, an elastic plate 18a is first inserted into the hollow of the hitting portion 11, and a weight silencing material 19
a was filled to form a layer. Next is also within the hollow is filled with a fill weight sound-deadening material 19b until it reaches the hole 16 even to the tip portion by inserting an elastic plate 18b solid of tip 15 at the space 17.

In the metal bat of this embodiment, the filled sound deadening material 19a serves to fix the position of the elastic plate 18a so as not to slip, and the heavy sound deadening material 19b serves as the elastic plate 1b.
The position of 8b is fixed so as not to slip and also serves as a stopper. Also, the weight silencer 19b at the tip end
Although the effect of contributing to the weight is great, the elastic plate 18a and the weight sound-absorbing material 19a placed near the hitting portion have a more remarkable sound-absorbing effect than the previous embodiment.

FIG. 8 is a sectional view of a tip portion of a metal bat showing another embodiment.

In the case of this embodiment, a hole 26 is formed in the foremost end 25 of the bat base material 24, an elastic plate 28a is first inserted into the hollow of the hitting portion 21, and then made of a liquid polyurethane resin. After filling the weight sound absorbing material 29a and inserting the elastic plate 28b into the hollow of the distal end portion 25 with the space 27,
The liquid of the polyurethane resin 29a previously filled is formed into a film so as to spread over the entire inner wall of the hollow and solidified. Finally, the end of the elastic plate 28b is filled with a full weight silencer 29b until it reaches the hole 26 and solidified.

The metal bat obtained by the manufacturing method of this embodiment has a function of fixing the weight silencer 29a to the position of the elastic plates 28a and 28b so as not to slip, and the weight silencer 29b reduces the weight. The effect that contributes is large,
This also made the effect of silencing even more remarkable.

FIG. 9 is a sectional view of a tip portion of a metal bat showing still another embodiment.

In the case of this embodiment, a hole 36 is formed in the foremost end 35 of the bat base material 34, and an elastic plate 38 is inserted from the hole 36 into a tip portion inside the hollow. Next, this elastic plate 38
In the upper part of the center, put a weight silencer 39a made of rubber lumps, foam material, metal lumps, etc., and fill the top end with a weight silencer 39b made of a liquid polyurethane resin until it reaches the hole 36 and solidify. Let it.

The metal bat obtained by the manufacturing method of this embodiment has a weight sound absorbing material 3 made of rubber lumps, metal lumps, or the like.
The addition of 9a facilitated weight adjustment.

[0027]

According to the metal bat obtained by the manufacturing method of the present invention, a sound absorbing material is put in a circular pipe.
Absorbed the metal sound of the blow, softened and silenced.

In the metal bat according to the method of the present invention, the tip portion is filled with a heavy object and the tip is made heavy. When the bat starts rotating at the time of hitting, the rotational speed is increased by the moment of inertia and the head speed is increased. As a result, the ball was hit hard, and the flight distance was longer than that of a conventional metal bat.

According to the method of the present invention, since the weight silencer is added after quenching, a wide range of materials that cannot withstand high temperatures can be selected.

According to the method of the present invention, since a relatively large hole is formed, the weight sound-absorbing material and the elastic plate are not limited to liquid, expected or thin-shaped material.

In the method of the present invention, if the tip of the liquid material is turned downward to solidify the liquid material, the adhesion is improved when the stopper is plugged, and if there is no plug, a release paper is applied to the tip of the tape. A flush front end is formed. In addition, if the stopper and the like are colored by weight, the bat can be easily identified.

[Brief description of the drawings]

FIG. 1 is a flow sheet showing a method for manufacturing a metal bat of the present invention.

FIG. 2 is a cross-sectional view of a metal bat according to the manufacturing method of the present invention.

FIG. 3 is a cross-sectional view of a tip portion of a metal bat after a step of drilling a hole in a foremost portion of a bat base material, showing one embodiment of a manufacturing process of the present invention.

FIG. 4 is a cross-sectional view of a tip portion of a metal bat after a step of inserting an elastic plate, showing one embodiment of a manufacturing process of the present invention.

FIG. 5 is a cross-sectional view of a tip portion of a metal bat after a step of filling a weight sound deadening material, showing one embodiment of the manufacturing process of the present invention.

FIG. 6 is a cross-sectional view of a distal end portion of a metal bat in a state where a plug is inserted and a weight silencing material is solidified downward, showing an embodiment of a manufacturing process of the present invention.

FIG. 7 is a cross-sectional view of a tip portion of a metal bat showing another embodiment according to the method of the present invention.

FIG. 8 is a cross-sectional view of a tip portion of a metal bat showing another embodiment according to the method of the present invention.

FIG. 9 is a cross-sectional view of a tip portion of a metal bat showing still another embodiment according to the method of the present invention.

[Explanation of symbols]

 4 Bat Base Material 24 Bat Base Material 34 Bat Base Material 5 Cutting Edge 15 Cutting Edge 25 Cutting Edge 35 Cutting Edge 6 Hole 16 Hole 26 Hole 36 Hole 7 Hollow 8 Elastic Plate 18a Elastic Plate 18b Elastic Plate 28a Elastic Plate 28b Elastic plate 38 Elastic plate 9 Weight silencer 19a Weight silencer 19b Weight silencer 29a Weight silencer 29b Weight silencer 39a Weight silencer 39b Weight silencer 10 Plug

Claims (4)

(57) [Claims] 1. An aluminum alloy hollow circular tube is swaged.
After head spinning and quenching
Finishing process by metal finishing
In the manufacturing method, the head spinning may be performed at a tip end.
Forming the hole in the foremost part of the bad base material that has closed the hole
And insert an elastic plate from the bored hole into the tip of the hollow circular tube.
And a weight silencer from the hole to the tip of the hollow circular tube
Filling process with a plug that can be identified by coloring the hole
Making a metal bat, characterized by comprising the step of:
Construction method. 2. The method according to claim 1, wherein the head spinning is performed by closing a tip.
A step of drilling a hole at the foremost part of the weed bad base material;
Step of inserting an elastic plate from the installation hole into the hitting part in the hollow circular tube
And the tip side of the elastic plate of the hitting portion of the hollow circular tube from the hole
Filling the sound-absorbing material into
A step of inserting an elastic plate into the tip of the hollow circular tube from the
Filling the tip of the hollow circular tube with a weight silencer through the hole
The method for manufacturing a metal bat according to claim 1, comprising: 3. The head spinning process includes closing a tip.
A step of drilling a hole at the foremost part of the weed bad base material;
Step of inserting an elastic plate from the installation hole into the hitting part in the hollow circular tube
And the tip side of the elastic plate of the hitting portion of the hollow circular tube from the hole
Filling with a weight silencer made of liquid polyurethane resin
Process, leaving a space from the hole to the tip of the hollow circular tube
A step of inserting an elastic plate and the liquid polyurethane resin
Solidifying in a hollow circular tube to form a film;
Filling the tip of the hollow circular tube with the sound absorbing material through the hole and solidifying
2. A method for manufacturing a metal bat according to claim 1, comprising:
Method. 4. The head spinning process includes closing a tip.
A step of drilling a hole at the foremost part of the weed bad base material;
Inserting an elastic plate from the installation hole into the tip of the hollow circular tube
And filling the central upper portion of the elastic plate with a massive weight silencer
Process and the end of the massive weight sound deadening material of the hollow circular pipe from the hole
Filled with solid silencer made of polyurethane resin on the end side and solidified
2. A method for manufacturing a metal bat according to claim 1, comprising:
Method.