JP4829945B2 - Sports equipment using tungsten and its manufacturing method - Google Patents

Description

  The present invention relates to sports equipment using tungsten and a manufacturing method thereof, and can be used for golf equipment such as a golf club head, fishing equipment such as lures, reels, baskets, weights and the like, and bicycle parts. The golf club head includes a metal hollow golf club head such as a wood head, a putter, and an iron golf club head, and a bale holder and the like at a reel portion.

For example, putters and iron club heads in golf clubs are conventionally made of metal such as iron or titanium. If the golf club head is the same size, the head with a large moment of inertia around the center of gravity has a larger sweet area, and the head is stable and the direction of the ball is stable even when the hitting point is out of the sweet spot. Therefore, it is preferable. Therefore, it is generally desirable to form the material with a large specific gravity. Examples of metals having a higher specific gravity than iron or 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 miniaturized. It can also be used for bicycle parts.
However, the practical range for sporting goods is limited because copper and lead are too soft. Tungsten has the largest specific gravity among the above metals, and if it can be used, there is a merit that the moment of inertia of a golf club head or the like can be increased, and if the weight is the same, the size can be reduced. . Golf club heads using tungsten are disclosed in Patent Documents 1 and 2 below. The former is manufactured by sintering, and the latter is manufactured by sintering forging.
JP 7-216490 A JP-A-9-262326

Tungsten has a melting temperature of 3370 ° C., and when an industrial product made of tungsten is molded, it is not necessarily melted and cast in relation to a furnace. Normally, powder is sintered and molded as disclosed in the above publication. Do it. However, in the case of sintering molding, it is difficult to mold complex shapes, and in general, the sintering time is long, and the sintering temperature is still high at about 1500 ° C. There is an industrial problem that the molding cost is not cheap. In the case of performing forging after sintering, a process called forging is further required due to the above-mentioned problem of the sintering method, which requires more work. In addition, the molded product by the sintering method has high hardness and is difficult to finish by cutting or mechanical polishing.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide sports equipment that can be mass-produced even if it has a complicated shape while taking advantage of the high specific gravity of tungsten as much as possible. Another object is to provide low-cost sports equipment. It is another object of the present invention to provide sports equipment having characteristics that can be easily finished when necessary.

In view of the above object, in the first invention, the tungsten-iron-nickel alloy is manufactured by casting, the tungsten-iron-nickel alloy has a specific gravity of 9 or more, and the tungsten-iron-nickel alloy has Provided is a sports equipment characterized in that it contains 15% to 70% by weight tungsten, 15% to 70% iron, and 9% to 65% nickel.
In the second invention, the tungsten-iron-nickel alloy is produced by casting at 1300 ° C. to 1400 ° C., and the tungsten-iron-nickel alloy has a specific gravity of 9 or more, and the tungsten-iron-nickel alloy Provides sports equipment characterized in that it contains 15% to 70% by weight tungsten, 15% to 70% iron, and 9% to 65% nickel.

In the third invention, the tungsten-iron-nickel alloy is manufactured from a cast tungsten-iron-nickel alloy, the tungsten-iron-nickel alloy has a specific gravity of 9 or more, and the tungsten-iron-nickel alloy has a mass percentage of tungsten. Provides sports equipment that contains 15% to 70%, iron 15% to 70%, nickel 9% to 65%, and tungsten, iron, and nickel total 99% by weight or more .
In a fourth aspect of the invention, the tungsten-iron-nickel alloy manufactured at 1300 ° C. to 1400 ° C. has a specific gravity of 9 or more, and the tungsten-iron-nickel alloy Includes 15% to 70% by weight of tungsten, 15% to 70% of iron, 9% to 65% of nickel, and 99% by weight or more of tungsten, iron, and nickel. Provide sports equipment including the above.

In the fifth invention, there is a specific gravity of less than 9, the tungsten 15% mass percentage to 70% from 70% iron 15%, tungsten nickel comprises from 9% to 65% - iron - nickel There is provided a method for producing a sports equipment, characterized in that an alloy is manufactured by casting, and the casting is provided in any part of the sports equipment.
In the sixth invention, there is a specific gravity of less than 9, the tungsten 15% mass percentage to 70% from 70% iron 15%, tungsten nickel comprises from 9% to 65% - iron - nickel An alloy is produced by casting, and the obtained casting material is further forged to obtain a forged product, and the forged product is provided in any part of the sports equipment. .

In the first invention, when tungsten is used in the above range, the molding temperature is about 1300 to 1400 ° C. while maintaining a higher specific gravity than that of titanium or iron, which is lower than the temperature in the case of sintering molding. Therefore, it is possible to provide a sports equipment having a tungsten alloy portion that is relatively simple and low-cost without requiring a new special furnace.
In the second invention, the forging process results in a sporting article having a finer metal structure and improved strength.

In the third aspect of the invention, it is possible to industrially cast a tungsten alloy that lowers the melting temperature by adding nickel and iron, and improves the hot water flow by adding iron to maintain the specific gravity as high as 9 or more. Supplies can be provided at low cost.
In the fourth invention, by forging, the metal structure can be made denser 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 casting mold is less than the type of head constituting the golf club set. For example, the loft angle of the head (material) formed by casting can be changed according to the count by forging, and the cost can be reduced. Furthermore, considering the case of producing a plurality of types of golf club sets, each count head of one type of set is molded by casting. The same head (material) as each count head of the set is formed by casting, and based on this, for example, the loft angle can be changed somewhat for each type of set by forging. In this way, the loft angles of the same count heads between different types of sets can be made slightly different so that a set according to the user's habits and preferences can be selected. Such multiple types of sets can be provided at low cost.

  In the fifth invention, when tungsten is used within the above range, the molding temperature is about 1300 to 1400 ° C. while maintaining a higher specific gravity than that of titanium or iron, which is lower than the temperature in the case of sintering molding. Therefore, it is possible to provide a sports equipment having a tungsten cast alloy portion that is relatively simple and low-cost, and that can be applied with a conventional casting method (lost wax method or the like), does not require a new special furnace.

Hereinafter, the present invention will be described in more detail based on an embodiment shown in the accompanying drawings.
FIG. 1 is a front view of a head 10 of an iron golf club in which a hosel portion 12 is integrated, and FIG. 2 is a cross-sectional view taken along line BB in FIG. A cavity (concave portion) 16 is formed on the rear side of the face portion 14 of the head 10, and a sole portion 18 is formed below the cavity. In the present invention, the head with the hosel part is formed by a casting method including 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. Molded with tungsten alloy.

Table 1 below shows various experimental examples performed for the head casting.

  In the above experiment, the cast product (head) was evaluated from the three viewpoints of hot water flow, cast surface state other than the nest pattern, sink mark, twist, and the like, and nest generation. The composition is composed mainly of tungsten W, iron Fe, and nickel Ni. In addition, in this experimental example, tin Sn and copper Cu are added in an amount of about 1% by weight, but one or both of them are present. The presence of small amounts of other additives with or without one or both of these is acceptable. Iron joins mainly to improve the hot water flow and plays a role of lowering the melting temperature, and nickel mainly contributes to lowering the melting temperature.

  The cases evaluated as poor (×) as the overall evaluation are Experimental Examples 1 and 3 except for Experimental Examples 11 and 12 for the reason that the specific gravity is less than 9. Both the iron is 10%, the hot water flow is poor, and the head end is low. Chipping etc. occurred in the part. Moreover, it is thought that the cast skin state did not become beautiful by the bad hot water flow. In Experimental Example 1, nests were observed, and the product was judged to be defective. Comparing Experimental Examples 2 and 3, Experimental Example 2 has a low nickel content of 14% but a high iron content of 15%, which improves the casting flow condition and prevents the formation of nests. It is thought that it was done. In all other experimental examples, the weight percentage of iron exceeds 15%, the hot water flow is good, and other evaluation items are also good.

  As a result, the weight% of iron must be 15% or more and 70% or less, and tungsten must be 15% or more in order to make the specific gravity 9 or more. In addition, when the weight percent of tungsten exceeds 70%, the amount of other compositions is too small according to Experimental Example 1, resulting in poor evaluation. When attention is paid to nickel, when the overall evaluation is good (◯), the range is 9% or more and 65% or less. The sporting goods such as the head thus cast can be processed for finishing as compared with the sintered product. Further, in order to avoid finishing as much as possible, it is preferable to use precision casting such as a 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. In addition, a 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 an advantageous head as described above. In addition, the face plate 14 ′ is not limited to the tungsten alloy according to the present invention. For example, another suitable member having a high resilience characteristic can be selected, so that the degree of freedom in designing the head is increased.

  Further, in order to integrate the face plate 14 ′ into the head main body, the outer edge of the peripheral edge 10 </ b> H of the head main body that accommodates the face plate 14 ′ is caulked and fixed or welded. For example, when the face plate 14 ′ is made of a titanium alloy, caulking is performed, and when the face plate 14 ′ is maraging steel, welding may be performed. As in this example, in the present invention, in addition to the case where the entire product is formed of a tungsten alloy, other members may be partially combined. Moreover, the part formed with the tungsten alloy of the present invention may be subjected to a rust prevention treatment such as covering with a corrosion-resistant protective coating such as plating.

FIG. 5 shows an example in which the tungsten alloy according to the present invention is used for a lure used for fishing. In this example, the luer body 20 is formed of the tungsten alloy according to the present invention instead of the needle 22. 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 fishhook 32 used for fishing. In this case as well, the weight size can be reduced.

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

  The present invention can be used for sports equipment such as golf club heads using tungsten.

FIG. 1 is a front view of an iron golf club head as a first application embodiment according to the present invention. 2 is a cross-sectional view taken along line BB in FIG. FIG. 3 is a front view showing a head as a second application example. 4 is a cross-sectional view taken along line DD in FIG. FIG. 5 is a diagram of a lure as a third applied embodiment. FIG. 6 is a diagram of a fishhook as a fourth application embodiment. FIG. 7 is a view of a spinning reel as a fifth applied embodiment.

Explanation of symbols

10 Iron Golf Club Head 12 Hosel Part 14 Face Part 14 'Face Plate

Claims (6)

Cast tungsten - iron - are manufactured by a nickel alloy, the tungsten - iron - nickel alloy, there is a specific gravity of less than 9, the tungsten - iron - nickel alloy, tungsten weight percentage 70% 15% Up to 15% to 70% of iron and 9% to 65% of nickel are included. Manufactured by a nickel alloy, the tungsten - - 1300 ° C. to 1400 tungsten was cast at ° C. - Iron Iron - nickel alloys, there is a specific gravity of less than 9, the tungsten - iron - nickel alloy, the mass percentage Sporting goods characterized by containing 15% to 70% tungsten, 15% to 70% iron, and 9% to 65% nickel. Cast tungsten - iron - are manufactured by a nickel alloy, the tungsten - iron - nickel alloy, there is a specific gravity of less than 9, the tungsten - iron - nickel alloy, tungsten weight percentage 70% 15% Up to 15% to 70% of iron, 9% to 65% of nickel, and 99% by weight or more of tungsten, iron and nickel in total. Manufactured by a nickel alloy, the tungsten - - 1300 ° C. to 1400 tungsten was cast at ° C. - Iron Iron - nickel alloys, there is a specific gravity of less than 9, the tungsten - iron - nickel alloy, the mass percentage Sporting goods containing 15% to 70% tungsten, 15% to 70% iron, 9% to 65% nickel, and a total of 99% or more by weight of tungsten, iron, and nickel. Producing by casting a nickel alloy - a a specific gravity of less than 9, the tungsten 15% mass percentage to 70%, iron up to 70 to 15% tungsten nickel is contained up to 65% 9% - Iron A method for producing sports equipment, wherein the casting is provided in any part of the sports equipment. Producing by casting a nickel alloy - a a specific gravity of less than 9, the tungsten 15% mass percentage to 70%, iron up to 70 to 15% tungsten nickel is contained up to 65% 9% - Iron Then, the casting material obtained is further forged to obtain a forged product, and the forged product is provided in any part of the sports equipment.

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