CN1265853C - Weights for golf club heads - Google Patents

Abstract

A weight block of a golf club head is made of tungsten-molybdenum-nickel alloy which is prepared by powder metallurgy or precision casting, wherein the tungsten-molybdenum-nickel alloy comprises 1 to 70 weight percent of tungsten, 4 to 55 weight percent of molybdenum and 25 to 95 weight percent of nickel. The molybdenum component can improve the specific gravity and the rust and corrosion resistance of the balancing weight; meanwhile, the tungsten, the molybdenum and the nickel can form a more uniform metallographic phase, so that the bright surface uniformity of the balancing weight can be relatively increased.

Description

Weights for golf club heads

technical field

The invention relates to a counterweight of a golf club head, in particular to a counterweight whose specific gravity, antirust and corrosion resistance and uniformity of bright surface are improved by molybdenum.

Background technique

The counterweight of conventional golf club heads is usually made of tungsten (19.30g/cm ³ ), iron (7.8g/cm ³ ) and nickel (8.9g/cm ³ ) with high specific gravity by conventional powder metallurgy process. , High-hardness metal powder, formed by pressing and sintering to form a tungsten-iron-nickel weight suitable for golf club heads. Although this powder metallurgy process is widely used in the industry, there are still many disadvantages in this process, such as: high cost of molding, low elongation of finished products, long process time, easy thermal expansion and contraction, and inability to form precise patterns, characters, Model and trademark etc.

Another commonly used counterweight for golf club heads, such as "a counterweight for a golf club head and its manufacturing method" in Taiwan Patent Application No. 91116681 filed by the applicant on July 24, 2002 Invention patent, which mainly uses the precision casting process to manufacture the tungsten-iron-nickel alloy weight block, and uses the specific metal melting sequence and composition ratio to effectively prevent the precipitation of tungsten with a high melting point. The investment casting process is to mix nickel, iron, tungsten, silicon, manganese and niobium according to a predetermined ratio of 30% to 50%: 30% to 50%: 20% to 35%: less than 1.0%: less than 1.0%: less than 0.5% , and sequentially added to a high-temperature furnace above 1450°C for melting to obtain a weight block for a golf club head made of tungsten-iron-nickel alloy. The prepared counterweight is combined with the head of a golf ball by embedding, welding, etc., and the body is generally made of stainless steel, such as SUS304, 17-4, 4130 and other stainless steel series.

The investment casting process can overcome the above-mentioned problems caused by the conventional powder metallurgy process. However, when the mixed composition of tungsten, iron, and nickel is not controlled properly, it is easy to cause the "γ (iron, nickel)" phase of the prepared tungsten-iron-nickel alloy to precipitate the Pearlite structure in the substrate, resulting in complex The corrosion resistance of the weight is reduced, and welding hot cracks are likely to occur when the weight is welded to the club head. At this time, if the tungsten-iron-nickel alloy is subjected to a 40°C, 24-hour salt spray test using about 5.0Wt% sodium vapor solution to simulate a highly corrosive climate environment, it can be found that the tungsten-iron-nickel alloy is rusted. The area often exceeds about 8%. Furthermore, since the surface of the tungsten-iron-nickel alloy often has tungsten precipitated (the dark part is the wavelaid iron structure, and the white part surrounded by the wavelaid iron is the precipitated tungsten), so the "tungsten + The γ (iron, nickel) phase also causes the weight block made of tungsten-iron-nickel alloy to produce patterns after grinding, so that the weight block made of tungsten-iron-nickel alloy is directly bonded to the bottom surface of the club head. At the same time, the fitting line between the tungsten-iron-nickel alloy and the rod head is clearly visible, and with the difference in grinding thickness and angle, each finished product is different, so it is difficult to control the process conditions.

As mentioned above, since the weights of the conventional tungsten-iron-nickel alloys all contain iron, the weights are prone to defects in metallographic composition, rust and corrosion resistance, and welding properties, and seriously affect golf club heads. The assembly, appearance, bonding strength, process margin and service life of the finished product make it necessary to further improve the tungsten-iron-nickel alloy weight of the conventional golf club head.

In view of this, the present invention improves the above-mentioned shortcomings. It uses powder metallurgy or precision casting to make a balance weight with an appropriate amount of tungsten, molybdenum, and nickel. Since the balance weight does not contain iron, it can form a uniform metallographic phase. Composition and better rust and corrosion resistance. At the same time, the molybdenum component can effectively increase the specific gravity of the counterweight. Therefore, the present invention can effectively improve the specific gravity, anti-rust and corrosion resistance, uniformity of bright surface and appearance of the counterweight, and make the counterweight suitable for welding and bonding process.

Contents of the invention

The main purpose of the present invention is to provide a weight for a golf club head, which is made of a tungsten-molybdenum-nickel alloy. composition, so that the present invention has the effects of improving the specific gravity and antirust and corrosion resistance of the counterweight.

The secondary purpose of the present invention is to provide a weight for a golf club head, which is made of a tungsten-molybdenum-nickel alloy. The tungsten, molybdenum and nickel can form a relatively uniform metallographic Tungsten is precipitated on the surface of the counterweight, so that the present invention has the effect of improving the uniformity and appearance of the bright surface of the counterweight.

The weight of the golf club head according to the present invention is made of powder metallurgy or precision casting tungsten-molybdenum-nickel alloy, the tungsten-molybdenum-nickel alloy contains 1% to 70% by weight of tungsten, 4% to 55% % molybdenum and 25% to 95% nickel. The molybdenum component can improve the specific gravity of the counterweight and the anti-rust and corrosion resistance: at the same time, the tungsten, molybdenum and nickel can form a relatively uniform metallographic phase, so it can also relatively increase the uniformity of the bright surface of the counterweight.

The specific gravity of the tungsten-molybdenum-nickel alloy is 8.6 grams/cubic centimeter to 16.6 grams/cubic centimeter. The tungsten-molybdenum-nickel alloy additionally contains less than 1.5% silicon to increase fluidity during casting. It also contains at least one component improving mechanical properties, which is selected from the group consisting of less than 1.0% manganese, less than 4.0% copper, less than 1.0% vanadium, and less than 1.0% niobium.

The invention uses molybdenum to replace iron to improve the physical and chemical properties of the weight of the golf club head, and has the effects of improving the specific gravity of the weight, rust and corrosion resistance, uniformity of bright surface, appearance and combined assembly margin , and make the counterweight suitable for welding bonding process.

Description of drawings

Figure 1: An exploded perspective view of the counterweight of the golf club head of the present invention

10 Counterweight 20 Rod Head 21 Compartment

Detailed ways

Please refer to FIG. 1 , which discloses an exploded perspective view of the weight block of the golf club head of the present invention. one

The counterweight 10 can be combined in a chamber 21 of a rod head 20 by means of welding, embedding, pressing and brazing. The shape of the counterweight 10 and the position of the chamber 21 are selected and changed according to product requirements, and the present invention can choose to manufacture the counterweight 10 by precision casting or powder metallurgy.

When choosing to use the precision casting method, firstly, the required ingredients are added to the high-temperature furnace (the temperature is between 1450°C and 1750°C, preferably between 1660°C and 1680°C) according to the specific metal melting sequence and composition ratio. At the same time, the mixing ratio of tungsten, molybdenum and nickel is properly controlled to obtain molten tungsten-molybdenum-nickel alloy; then, the molten tungsten-indium-nickel alloy is cast in a preheated mold with a predetermined shape, precise pattern or text (preheating temperature It is preferably set between 950° C. and 1300° C.), so that the balance weight of the golf club can be made by precision casting. The counterweights obtained above can be selected to be combined with a club head by embedding, welding, pressing or brazing. The club head is usually made of stainless steel, such as SUS304, 17-4, 4130 series of stainless steel.

In terms of the metal melting sequence of the above-mentioned investment casting, the present invention preferably adds nickel particles, molybdenum particles and tungsten particles into the high-temperature melting furnace in sequence, so that the molten nickel component can be used to lower the melting temperature of the tungsten component, thereby promoting Tungsten particles with high melting point melt smoothly in the high-temperature furnace without forming tungsten precipitation.

Then, with regard to the composition ratio of the above-mentioned investment casting, the present invention can detect and control by appropriate sampling, so that the molten tungsten-molybdenum-nickel alloy that makes comprises 1% to 70% tungsten (w), 4% to 55% Molybdenum (MO) and 25% to 95% nickel (Ni) (weight percent). At this time, compared with the specific gravity (19.3g/cm ³ ) and melting point (3410°C) of the tungsten component, although the specific gravity (10.2g/cm ³ ) of the molybdenum component is slightly smaller, its melting point is relatively low (2610°C). Therefore, the present invention can relatively reduce the temperature requirement during precision casting by increasing the amount of molybdenum used and simultaneously reducing the amount of tungsten used.

The preset specific gravity of the tungsten-molybdenum-nickel alloy of the present invention can be changed according to the application of different golf clubs, but the specific gravity range is preferably between 8.6g/cm ³ and 16.6g/cm ³ .

On the other hand, when the present invention chooses to utilize the powder metallurgy method, it is to make the tungsten powder, molybdenum powder and nickel powder uniform according to the above-mentioned same weight percentage of 1% to 70%: 4% to 55%: 25% to 95%. Mixing, followed by pressing and sintering the mixed metal powders, so that the counterweight 10 can be formed.

As a result, regardless of whether the tungsten-molybdenum-nickel alloy counterweight 10 of the present invention is manufactured by precision casting or powder metallurgy, the tungsten-molybdenum-nickel alloy counterweight 10 can use molybdenum to replace the conventional tungsten-iron-nickel alloy counterweight The iron component of the block and relatively reduce the amount of tungsten used. The counterweight 10 based on the tungsten-molybdenum-nickel alloy does not contain iron components, and the specific gravity of the molybdenum component is greater than that of the iron component, and its anti-rust and corrosion resistance is better than that of the iron component, so the counterweight 10 will not produce wave iron, etc. It is not conducive to the structural strength or corrosion resistance of the organization, so the present invention can improve the specific gravity and rust and corrosion resistance of the counterweight 10 of the golf club head. For example, when the tungsten-molybdenum-nickel alloy is subjected to a 40°C, 24-hour salt spray test using a 5.0% by weight sodium chloride solution to simulate a highly corrosive environment, it will be found that the tungsten-molybdenum-nickel alloy effectively improves rust question.

The weight block 10 can be combined with the club head 20 by embedding, pressing or brazing, and can also be applied to the welding process. When welding, it can choose argon welding, laser welding or electron beam welding.

Furthermore, because the tungsten-molybdenum-nickel alloy itself of the present invention can form a relatively uniform metallographic phase and does not contain iron components, it will not produce γ (iron, nickel) phases, and can completely avoid precipitation on the surface of the tungsten-molybdenum-nickel alloy. Tungsten to prevent mottled patterns. Since the surface of the counterweight 10 can form a better glossy uniformity, when the counterweight 10 is directly bonded to the surface of the club head 20 (especially in an embedded manner) and polished, the The fitting line between the counterweight 10 and the club head 20 is indistinguishable by direct eye observation, which is beneficial to avoid the difference in the bonding quality of each club head 20 and the counterweight 10, and can control the process conditions to be consistent. It is also used to increase the added value of the counterweight 10 and to combine with the assembly margin.

In addition, when manufacturing tungsten-molybdenum-nickel alloys, the present invention can also choose to add less than 1.5% silicon according to requirements to improve the fluidity during casting. In the present invention, an appropriate amount of manganese, copper, vanadium and niobium can also be added to improve the mechanical properties of the counterweight 10, and can effectively improve the fluidity and auxiliary degassing effect during casting. When the present invention selects to add the above-mentioned metals, its consumption preferably selects manganese (Mn) below 1.0%, copper (Cu) below 4.0%, vanadium (V) below 1.0% and/or niobium (Nb) below 1.0%. ). Generally, the tungsten-molybdenum-nickel alloy may contain some of the following trace dopants due to different sources of raw materials, such as carbon (C) below 0.1%, sulfur (S) below 0.1%, and phosphorus (P) below 0.1%.

As mentioned above, compared with the weight of golf club heads made by conventional precision casting, it is easy to precipitate wave iron and tungsten in the γ (iron, nickel) phase, which affects corrosion resistance, surface uniformity, appearance, and welding properties. , mechanical properties, fluidity and other shortcomings, the present invention can indeed improve the physical and chemical properties of the counterweight 10 of the golf club head by using the molybdenum component instead of the iron component, so as to improve the specific gravity of the counterweight 10, prevent rust and corrosion performance, uniformity of bright surface, appearance and combined assembly margin, and make the counterweight suitable for welding and bonding process.

Although the present invention has been disclosed with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be subject to what is defined in the scope of the patent application.

Claims (6)

1. A counterweight for a golf club head, characterized in that: it is made of tungsten-molybdenum-nickel alloy, and the tungsten-molybdenum-nickel alloy contains 4% to 55% by weight of molybdenum and 25% to 95% of nickel and 1% to 70% tungsten. 2. The weight of the golf club head according to claim 1, wherein the weight of the tungsten-molybdenum-nickel alloy is made by precision casting. 3. The weight of the golf club head according to claim 1, wherein the weight of the tungsten-molybdenum-nickel alloy is made of powder metallurgy. 4. The weight of a golf club head according to claim 1, wherein the specific gravity of the tungsten-molybdenum-nickel alloy is 8.6 g/cm3 to 16.6 g/cm3. 5. The weight of golf club head according to claim 1, characterized in that: the tungsten-molybdenum-nickel alloy further contains less than 1.5% silicon to increase the fluidity during casting. 6. The weight of golf club head according to claim 1, characterized in that it further contains at least one component for improving mechanical properties, the component is selected from manganese below 1.0%, copper below 4.0%, copper below 1.0% less than vanadium or less than 1.0% niobium.