JP2003183758A - Spots equipment using tungsten and its manufacturing process - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sports equipment which utilizes the high specific gravity of tungsten as much as possible and enables mass production, even if it has a complicating shape. <P>SOLUTION: A tungsten alloy part 10 is formed on the equipment through casting. The tungsten alloy part 10 contains at least 15-70 wt.% tungsten, 15-70 wt.% iron and 9-65 wt.% nickel and has a specific gravity of 9 or more. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to sports equipment using tungsten and its manufacturing method, and can be used for golf equipment such as golf club heads, fishing equipment such as lures, reels, sack baskets, weights, and parts for bicycles. Is. The golf club head includes a hollow golf club head made of metal such as a wood head, a putter, and an iron golf club head, and a bail holder and the like at a reel portion.

[0002]

2. Description of the Related Art For example, a putter of a golf club or a head of an iron club is conventionally made of a metal such as iron or titanium. If the golf club head has the same size, the head with a large moment of inertia around the center of gravity has a wider sweet area, and the head is stable and the directionality of the hit ball is stable even when the hit point deviates from the sweet spot. Therefore, it is preferable. Therefore, it is generally desired to use a material having a large specific gravity. Metals having a larger specific gravity than iron and titanium include copper, lead and tungsten. Articles that are desired to be formed of a material having a large specific gravity include fishing weights and lures in the sense that they can be downsized. It can also be used for bicycle parts. However, because copper and lead are too soft, the range of practical applications for sports equipment is limited. Tungsten has the highest specific gravity of the above metals, and if it can be used, it has the advantage of increasing the moment of inertia of the golf club head, etc., and of reducing the size of the same weight. . Golf club heads using tungsten are disclosed in JP-A-7-216490 and JP-A-9-262326. The former is manufactured by sintering and the latter is manufactured by sintering forging.

[0003]

Since the melting temperature of tungsten is as high as 3370 ° C., when molding an industrial product made of tungsten, it cannot be melted and cast due to the furnace. Sinter molding of the powder as disclosed is performed. However, in sintering molding, it is difficult to mold a complicated shape, and in general, the sintering time is long,
Furthermore, the sintering temperature is still high at about 1500 ° C., a dedicated mold is required, and the mold cost and molding cost are not low, which is an industrial problem. When forging is performed after sintering, in addition to the above-mentioned problems of the sintering method, a step of forging is necessary, which requires more labor. Further, since the molded product obtained by the sintering method has a high hardness and is difficult to be machined by cutting or mechanical polishing, it is difficult to finish it. Therefore, it is an object of the present invention to provide a sports article which can be mass-produced even in a complicated shape while making the most of the high specific gravity of tungsten. It also aims to provide low-cost sports equipment. Furthermore, it is an object to provide a sports article having a characteristic that it can be easily finished when necessary.

[0004]

In view of the above object, in claim 1 of the present invention, 15 to 70% by weight of tungsten and 1
Provided is a sports article comprising at least 5 to 70% by weight of iron and 9 to 65% by weight of nickel, having a specific gravity of 9 or more, and comprising a cast tungsten alloy portion. When using tungsten in the above range, while maintaining a higher specific gravity than titanium or iron,
The molding temperature is about 1300 to 1400 ° C, which is lower than the temperature in the case of sinter molding, the conventional casting method (lost wax method, etc.) can be applied, and a new special furnace is not required, and it is relatively simple and low. A sports article having a costly tungsten alloy portion can be provided.

According to a second aspect of the present invention, there is provided the sporting goods according to the first aspect, wherein the tungsten alloy portion is formed by further forging a material by casting. By forging, it becomes a sports article with a more dense metal structure and improved strength. In claim 3, a tungsten alloy product containing at least 15 to 70% by weight of tungsten, 15 to 70% by weight of iron, and 9 to 65% by weight of nickel and having a specific gravity of 9 or more is obtained by casting, and at least There is provided a method for producing sports equipment, characterized by comprising the cast product. The addition of nickel and iron lowers the melting temperature, and the addition of iron improves the flow of molten metal to increase the specific gravity to 9
As a result, it becomes possible to industrially cast a tungsten alloy that is kept at a high value as described above, and sports goods can be provided at low cost.

According to a fourth aspect of the present invention, there is provided the method for manufacturing a sports article according to the third aspect, wherein the tungsten alloy product is obtained by casting and then forging. By forging, the metal structure can be made more dense and the strength can be improved. Further, for example, when a golf club head is considered as an example of sports equipment, when a certain type of golf club set is manufactured, the number of casting molds is less than that of the heads constituting the golf club set, for example, 1 For example, the loft angle of the head (material) formed by this casting can be changed according to the count by forging, and the cost can be reduced. Furthermore, considering the case of manufacturing a plurality of types of golf club sets, each count head of one set of a certain type,
It is formed by casting, but in other types of sets, the same head (material) as each count head of the certain type of set is formed by casting, and based on this, for example, the loft angle is set by forging. It can be changed somewhat for each type. In this way, the loft angles and the like of the heads of the same count among different types of sets can be made slightly different, and a set can be selected according to the habits and preferences of the user. It is possible to provide such multiple types of sets at low cost.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the accompanying drawings. FIG. 1 is a front view showing a head 10 of an iron golf club in which a hosel portion 12 is integrated, and FIG. 2 is a line BB of FIG.
FIG. A cavity (recess) 16 is formed on the rear side of the face portion 14 of the head 10, and the lower side of the cavity is a sole portion 18. In the present invention, the head with a hosel part is used in an amount of 15 to 70% by weight.
Tungsten, 15-70 wt% iron, 9-65
The tungsten alloy was formed by a casting method containing at least nickel by weight and having a specific gravity of 9 or more.

Table 1 below shows various experimental examples conducted for this head casting.

[Table 1]

In the above experiment, the cast product (head) was evaluated from three viewpoints: the flow of molten metal, the state of the cast surface such as a plaque pattern, sink marks and twists other than the porosity, and the generation of porosity. The composition is mainly composed of tungsten W, iron Fe, and nickel Ni. In addition, in this experimental example, tin Sn and copper Cu are added together in an amount of about 1 wt%, but one or both of them are present. It is acceptable to have other additives in the absence of, and with or without one or both of these. Iron mainly participates in improving the flow of molten metal and plays a role of lowering the melting temperature, and nickel mainly contributes to the lowering of the melting temperature.

The cases evaluated as bad (x) in the comprehensive evaluation are Experimental Examples 1 and 3 except Experimental Examples 11 and 12 which have a specific gravity of less than 9, and the iron content is as small as 10% and the flow of molten water is poor. As a result, a chip or the like was produced at the end of the head. It is also probable that the casting surface was not clean due to the poor flow of the molten metal. In Experimental Example 1, nest formation was also seen, and it was judged that the product was defective. Comparing Experimental Examples 2 and 3, in Experimental Example 2, the amount of iron is as large as 15% while the amount of nickel is as small as 14%. Therefore, the molten metal flow is improved, the casting surface condition is improved, and the occurrence of cavities is also prevented. It is thought that it was done. In all the other experimental examples, the weight% of iron exceeds 15%, the flow of molten metal is good, and other evaluation items are also good.

As a result of the above, the weight% of iron must be in the range of 15% or more and 70% or less, and in order to make the specific gravity 9 or more, the content of tungsten must be 15% or more. Further, when the weight% of tungsten exceeds 70%, the amount of other compositions is too small according to Experimental Example 1, and the evaluation becomes poor. Looking at nickel,
When the comprehensive evaluation is good (◯), the range is 9% or more and 65% or less. Sports products such as heads cast and formed in this manner can be subjected to cutting work for finishing as compared with sintered products. Further, in order to perform finishing as little as possible, it is preferable to use precision casting such as the so-called lost wax method.

3 and 4 show a second embodiment. That is, in the head 10 of this example, the head main body portion excluding the face plate 14 'forming the face portion is formed of the tungsten alloy according to the present invention. Further, the region of the head main body located on the rear side of the face plate is a through cavity 10A except for the peripheral portion. The iron golf club head 10 having such a shape has a large moment of inertia around the center of gravity due to the high specific gravity of the tungsten alloy, and is a convenient head as described above. Further, the face plate 14 'is not limited to the tungsten alloy according to the present invention, but another suitable member having a high resilience characteristic can be selected, so that the degree of freedom in designing the head is increased.

To integrate the face plate 14 'with the head body, the outer edge of the peripheral edge 10H of the head body containing the face plate 14' is caulked to be fixed or welded. For example, face plate 14 '
If is a titanium alloy, caulking may be performed, and if it is maraging steel, welding may be performed. As in this example, in the present invention,
Other than the case where the entire product is formed of a tungsten alloy, other members may be partially combined. Further, the portion formed of the tungsten alloy of the present invention may be subjected to antirust treatment such as covering with a corrosion resistant protective coating such as plating.

FIG. 5 is an example in which the tungsten alloy according to the present invention is used for a lure used for fishing. In this example,
Instead of the needle 22, the luer body 20 is made of the tungsten alloy according to the present invention. Therefore, the lure body 20 can be formed small. FIG. 6 shows an example in which the tungsten alloy according to the present invention is used for the weight 30 attached to the base of the fishing hook 32 used for fishing, and in this case as well, the size of the weight can be reduced.

FIG. 7 shows an example applied to a spinning reel, in which the tungsten alloy according to the present invention is used for the bale holder 40 mounted on the arm portion 44 of the rotor and holding the bale 42. This is used as an adjusting material for balancing the rotation of the rotor. This is convenient because the weight size can be reduced when the weight is positively required to balance the rotation.

[0016]

As is apparent from the above description, according to the present invention, while utilizing the high specific gravity of tungsten as much as possible,
It is possible to provide sports products that can be mass-produced even with complicated shapes.

[Brief description of drawings]

FIG. 1 is a front view of an iron golf club head as a first application example of the present invention.

2 is a cross-sectional view taken along the line BB of FIG.

FIG. 3 is a front view showing a head as a second application example.

4 is a cross-sectional view taken along the line D-D of FIG.

FIG. 5 is a diagram of a lure as a third application example.

FIG. 6 is a diagram of a fishhook as a fourth application example.

FIG. 7 is a diagram of a spinning reel as a fifth application example.

[Explanation of symbols]

10 Iron Golf Club Head 12 Hosel part 14 Face 14 'face plate

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) A63B 53/04 A63B 53/04 B C G K A01K 85/00 B (72) Inventor Jun Iijima Tokyo East 3-14-16 Maesawa Kurume-shi, Daiwa Seiko Co., Ltd. (72) Inventor Hitoshi Tamura 3--14-16 Maesawa, East Kurume-shi, Tokyo Daiwa Seiko Co., Ltd. F-term (reference) 2B107 BA70 JA01 2B108 BC00 2B109 AA00 2C002 AA02 AA03 AA04 MM04

Claims (4)

[Claims] 1. Tungsten 15-70% by weight and 1
A sports article comprising at least 5 to 70% by weight of iron and 9 to 65% by weight of nickel, having a specific gravity of 9 or more, and comprising a cast tungsten alloy portion. 2. The sports equipment according to claim 1, wherein the tungsten alloy portion is formed by further forging a cast material. 3. Tungsten 15-70% by weight and 1
A sports characterized in that a tungsten alloy product containing at least 5 to 70% by weight of iron and 9 to 65% by weight of nickel and having a specific gravity of 9 or more is obtained by casting, and at least the casting product is provided. How to make supplies. 4. The method for manufacturing a sports article according to claim 3, wherein the tungsten alloy product is obtained by casting and then forging.