JPH10192454A - Golf club head and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the film bonding of each member, and to prevent the appearance from being damaged by joining a plurality of members with each other through the filler metal to improve the bonding structure of a head to be formed by integrating a plurality of members consisting of dissimilar metals. SOLUTION: A head body 2 of an iron club, for example, is formed of stainless steel, and a face plate 4 made of pure titanium is joined with a face part 3. A weight member 7 made of tungsten alloy is joined with a periphery of a back part of the head body 2. Pure silver brazing filler metal is arranged between recessed part 8a provided in the face part 3 and the face plate 4 as the filler metal to join the face plate 4 with the head body 2, and in addition, silver JIS-BAG8 brazing filler metal is arranged between a recessed part 8b to which the weight member 7 is fitted and an outer periphery of the weight member 7 as the filler metal to join the head body 2 with the weight member 7, and these brazing filler metals are melted and welded to realize the integrated joining.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club head and a method of manufacturing the same, and more particularly, to an improvement in a head joining structure in which a plurality of members are joined and fixed, and a method of manufacturing the same.

[0002]

2. Description of the Related Art As a method of manufacturing a metal golf club head (hereinafter abbreviated as a head), for example, for an iron head, for example, a method in which the entire head is integrally formed by casting, forging, or the like is generally used. In general, a wood head is formed by forming a plurality of members by casting, forging, or the like, and then joining and integrating the members by welding.

Recently, when a golf club is hit with a ball, in order to stabilize the direction of the ball and obtain a longer flight distance, for example, in the case of an iron head, a face plate which is a part of the face portion of the head is provided. The head body, which is formed of a material having a relatively low specific gravity such as aluminum, titanium, or a titanium alloy, and is a portion other than the face plate, has a specific gravity higher than that of the face plate such as stainless steel, soft iron, copper, copper alloy, tungsten, and brass. And a unit formed by integrating a material having a larger specific gravity than a material constituting the head on a back portion corresponding to the back surface of the face portion of the head. In some wood heads, a sole member constituting the bottom surface of the head is formed of a material having a higher specific gravity than other members, and both are joined and fixed.

[0004] It is known that by adopting the above configuration, the head can increase the moment of inertia around the center of gravity of the head, and can also adjust the depth of the center of gravity and the like. Therefore, the material forming the head body and the face plate, the material forming the sole plate and the head body, or the weight member to be attached to the head are made of different metal materials. In order to form a head by joining and fixing the members made of the dissimilar metal materials to each other, the members are fixed with a coupling member such as a screw, and the uneven portions for fitting are formed on each member. Known are those which are fitted and fitted into a part by press-fitting, caulking, etc., and integrated, or integrated by bonding using an adhesive, or so-called fusion welding such as arc welding.

[0005]

The following problems have been encountered in the case where the members made of the dissimilar metal materials are joined and fixed to be integrated. That is, when the above members are joined using a joining member which is a separate member, for example, in order to attach the face plate to the head main body, the face plate is inserted into the face plate insertion recess of the head main body, and a coupling member such as a screw is attached. When both are fixed by using the method, not only the number of components and the number of steps are increased, but also the appearance of the screw on the face surface of the completed head is disadvantageously impaired. Also, in order to join the weight member to the back portion of the head or to join the head body and the face plate, an uneven portion for fitting the two to the joint portion of the member is formed, and the two are press-fitted. In the case of fitting or forming a caulked portion on the peripheral edge of the member and fitting and fixing the two by caulking, the two are not necessarily in close contact with each other, such as impact during use As a result, there is a risk that a gap may be formed between them and the face plate may be peeled off.

In the case where members made of these dissimilar metal materials are joined by fusion welding, the members to be joined are melted and joined, so that the members to be joined are made of different materials. In such a case, the melt welding is difficult, and it is difficult to obtain a sufficient welding strength, and the weld bead appearing on the surface after the melt welding remains even after finishing polishing, so that the appearance is not preferable. In view of the above, the present invention has improved a joining structure of a head formed by joining and integrating a plurality of members made of dissimilar metal materials in particular, and a golf club head which can firmly join the respective members and which does not impair the aesthetic appearance. It is an object of the present invention to provide a manufacturing method thereof.

[0007]

In order to achieve the above-mentioned object, according to the present invention, a plurality of members are joined and fixed via a filler material.

[0008]

The invention according to claim 1 is a golf club head formed by joining a plurality of members, wherein each of the members is joined and fixed via a filler material. Head. The filler material is a metal that melts at a temperature lower than the transformation temperature of the member to be joined, and has good wettability with the member to be joined.
The material is selected from materials that do not cause embrittlement of the joint portion through the joining process.

According to a second aspect of the present invention, in the golf club head according to the first aspect, the plurality of members include a face plate forming a part of a face portion of the head and a face plate other than the face plate of the head. The face plate is a golf club head formed of a head body constituting a portion, wherein the face plate has a lower specific gravity than a material constituting the head body and is formed of a different material.

According to a third aspect of the present invention, in the golf club head according to the second aspect, the face plate is made of pure titanium, the head body is made of stainless steel, and the filler material contains 30% by weight or less of copper. A golf club head having a three-layer structure in which a silver-based brazing layer containing copper or a copper layer is sandwiched by the silver-based brazing layer containing 30% by weight or less of copper.

According to a fourth aspect of the present invention, in the golf club head according to the first aspect, the plurality of members are a weight member forming a part of a back portion or a sole portion of the head, and the weight of the head. The weight member is a golf club head made of a material other than the member and having a specific gravity greater than that of the material forming the head body and formed of a different material.

According to a fifth aspect of the present invention, in the golf club head according to the fourth aspect, the weight member is made of a tungsten alloy, the head body is made of pure titanium, and the filler material is 30% by weight or less. A golf club head having a three-layer structure in which a silver-based brazing layer containing copper or a copper layer is sandwiched by the silver-based brazing layer containing 30% by weight or less of copper.

According to a sixth aspect of the present invention, in the golf club head according to the first aspect, the plurality of members include a face plate constituting a part of a face portion of the head, and a back portion or a sole portion of the head. Weight member that constitutes a part of, and the head body that is the other part,
The specific gravity of the material constituting each member has a relationship of weight member> head body> face plate, and is a golf club head formed of different materials.

According to a seventh aspect of the present invention, in the golf club head according to the sixth aspect, the face plate is made of pure titanium, the head body is made of stainless steel, and a filler material between the two members is pure silver braze. Alternatively, the weight member is made of a tungsten alloy, and a filler material between the head body and the weight member has a copper content of 30% by weight or less. A golf club head which is a silver-based wax containing:

The invention according to claim 8 is a method of manufacturing a golf club head formed by joining a plurality of members, wherein a filler material is provided between joints of the members to be joined. After that, they are heated to a temperature below the transformation temperature of the member to be joined and the temperature at which the filler material is melted, and the filler material is wetted to the joining portion of each member, whereby Is a method for manufacturing a golf club head in which the above members are joined and integrated.

According to a ninth aspect of the present invention, in the method for manufacturing a golf club head according to the eighth aspect, the plurality of members are formed of a head body made of stainless steel and a material different from the head body. A method for manufacturing a golf club head in which a metal plating is applied to a portion of the stainless steel head body to which the other member made of a different material is joined.

[0017]

1 to 4 show a preferred embodiment of the present invention applied to an iron golf club head. As shown in FIGS. 1 and 2, an iron club head (hereinafter simply referred to as an iron head) 1 is
Like the conventional product, it is composed of a hosel part 5, a face part 3, a back part 6, and the like. The iron head 1 includes a face plate 4 which is a part of the face portion 3 of the iron head 1, and a weight member 7 joined to a peripheral portion of the back portion 6.
And the head main body 2 which is a part other than the two members, and each member is formed of a different kind of metal material. That is, in the present embodiment, the head main body 2 is formed of stainless steel, and the face plate 3 is joined to the face plate 4 made of pure titanium. A weight member 7 made of a tungsten alloy is joined to the periphery of the back portion 6 of the head body 2.

As shown in FIG. 3, between the recess 8a provided in the face portion 3 and the face plate 4, pure silver is used as a filler for joining the face plate 4 and the head body 2. A solder is provided, and between the recess 8b in which the weight member 7 is mounted and the outer periphery of the weight member 7, silver is used as a filler material for joining the head body 2 and the weight member 7. A system JIS-BAg8 wax is provided. The silver-based solder used in the present embodiment contains copper at 30% by weight or less. A silver-based solder containing 30% by weight or more of copper is not preferred because the melting temperature is lowered, but the mechanical strength when repeatedly hitting a golf club is poor.

The head body 2, the face plate 4 and the weight member 7 may be made of pure titanium, a titanium alloy, soft iron,
Copper, copper alloy, titanium alloy, aluminum, face plate
Aluminum alloy, silicon carbide reinforced titanium, weight member appropriately selected from copper, copper alloy and tungsten alloy, face plate made of material with lower specific gravity than material of main body, weight made of material with specific gravity higher than material of main body What is necessary is just to form with the combination of a member.

In the present embodiment, a silver brazing filler metal is used as the filler metal. However, the present invention is not limited to this, and the filler metal can be melted at a temperature lower than the transformation temperature of each member to be joined. Has a suitable wettability with the constituent materials of the members to be joined, and satisfies the mechanical strength at the time of joining, and is selected from a brazing material having a melting point of 450 ° C. or more;
Copper brazing, brass brazing, pure silver brazing, silver-based brazing, phosphor bronze brazing,
It can be selected from gold brazing, nickel brazing, pure aluminum brazing, aluminum alloy brazing, titanium brazing or the like according to the material of each member to be joined.

[0021] The iron head according to the present invention is a material having a melting point lower than the transformation temperature of each member to be joined, good wettability, and excellent mechanical strength at the time of joining. Since the filler material is selected and arranged in the gap between the joints of the members and integrated, the characteristics of the material constituting the members to be joined change due to heat at the time of joining. Since there is no fear and the gap between the two can be as small as 0.5 to 0.01 mm, the joint surface of the jointed and integrated iron head can be finished beautifully as compared with the melt-welded iron head.

In addition to the above, like the weight member 7 made of tungsten alloy and the head body 2 made of stainless steel,
In the case of using materials having greatly different coefficients of thermal expansion and joining via a filler material, a filler material having a three-layer structure in which a copper layer is sandwiched between silver-based brazing layers is used. If the filler material is melted and joined, a metal softer than the two members having different coefficients of thermal expansion is interposed between the two members, so that the impact upon hitting the ball can be reduced. Thus, the shrinkage strain due to heat between the members to be joined can be reduced.

As shown in FIG. 4, a method of manufacturing the iron head of the present invention is as follows. First, a concave portion 8 for accommodating the face plate 4 is provided in the face portion 3 of the iron head 2.
The head main body 2 is formed of stainless steel, and a concave portion 8b for mounting the weight member 7 is formed on the periphery of the back portion 6. The face plate 4 is formed from a pure titanium plate, and the weight member 7 is formed from a tungsten alloy.
To form At this time, both the face plate 4 and the weight member 7 are formed smaller than the respective recesses 8a and 8b for accommodating the filler and the weight of the filler member. In this embodiment, the gap is set to be 0.2 mm between the two.

In joining and fixing the face plate 4 and the weight member 7 to a predetermined position with a filler material, first, in order to join the face plate 4 to the head main body 2, the periphery of the recess 8 a of the head main body 2 is required. The walls and bottom are degreased with an organic solvent such as acetone. Next, the peripheral wall surface and the bottom surface of the concave portion 8a are polished with paper or the like to remove oxides on the surface. Then, the concave portion 8a is fixed by a jig so as to be horizontal, and 0.2 mm thick pure silver brazing foil and the face plate 4 are placed in this order on the concave portion 8a, and the face plate 4 is placed thereon. A weight is placed so that it fits properly in the recess 8a. In this embodiment, after polishing both the head body 2 and the recess 8a, the surface of the recess 8a is plated
After applying a thickness of 3 μm, the two are joined and fixed.

The members combined as described above are heated at 980 ° C. for 1 hour in an argon atmosphere to melt the filler material and join them. Thereafter, the surface portion 3 is gradually cooled, the surface is lightly polished, and excess filler material is removed.
Is completed. Further, the back portion 6 of the iron head 1
In order to join the weight member 7 to the iron head 1, it is not shown, but similarly to the joining of the face portion 3, the jig is fixed so that the concave portion 8 b of the back portion 6 of the iron head 1 is horizontal, and JIS-BAg8 with a thickness of 0.2 mm
The brazing foil and the weight member 7 are placed in this order, and heated at 880 ° C. for 1 hour in the same argon atmosphere to melt the filler material and join them. As described above, if the method of joining and fixing is performed using a filler material having a different melting temperature for each member to be joined, a difference in the melting temperature of the filler material between the face plate 4 and the weight member 7 is used. Because it can be bonded and fixed,
Even if the face plate 4 joined earlier faces downward when joining the weight members 7, there is no need to worry about the outflow of the filler material, and the workability is good. In addition, since the joining portion can be separated by reheating, the joining member can be easily replaced. After slow cooling, the surface is polished to form a stainless steel iron head 1 in which a face plate 4 made of pure titanium is joined to the face portion 3 and a weight member 7 made of tungsten alloy is joined to the back portion 6.

[0026]

As described above, according to the present invention, in the iron head formed by joining a plurality of members, the iron head having a melting point lower than the transformation temperature of the member to be joined with each member is interposed. Since the members to be joined are hardly melted, the dimensional accuracy of the joined and integrated iron head is improved, and an iron head with less distortion is obtained. Since the filler material is selected and disposed with good wettability with the member, even if the joining gap of the member is narrow, it can be sufficiently firmly joined. Therefore, an uneven portion for joining is formed on each member. Special processing such as bonding is not required, and the number of post-integration steps is reduced. In addition, since the filler material is melted and interposed between the joining gaps of the members to be joined to fix the members together, the members themselves are not melted and joined and fixed, so even if each member is formed of a different material. And sufficient bonding strength can be obtained.

According to the manufacturing method of the present invention, since the filler material for joining has a melting point lower than the transformation temperature of the member to be joined, the iron head joined and integrated is compared with the iron head welded and welded. Can be beautifully finished and the post-process can be simplified. Also, it is not necessary to join all the members at the same time, and it is possible to join and integrate the members for forming the iron head to form an iron head, and to perform a step joining such as fixing a weight member to the back side as necessary. Therefore, it is possible to provide an iron head capable of adjusting a design error such as changing a weight distribution as needed.

[Brief description of the drawings]

FIG. 1 is a front view showing an example in which the present invention is applied to an iron head.

FIG. 2 is a rear view of the iron head shown in FIG. 1;

FIG. 3 is a sectional view taken along line AA of the iron head shown in FIG. 1;

FIG. 4 is an explanatory view of one step of the method of manufacturing the iron head shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron head 2 Head main body 3 Face part 4 Face plate 5 Hosel part 6 Back part 7 Weight member 8a Depression 8b Depression 9 Filler material

Continued on the front page (51) Int.Cl. ⁶ Identification code FI B23K 35/30 310 B23K 35/30 310B

Claims (9)

[Claims] 1. A golf club head formed by joining a plurality of members, wherein each of the members is joined and fixed via a filler material. 2. The apparatus according to claim 1, wherein the plurality of members include a face plate that forms a part of a face portion of a head, and a head body that forms a portion of the head other than the face plate, wherein the face plate includes the head body. 2. The golf club head according to claim 1, wherein the specific gravity is smaller than that of the material constituting the material, and the material is formed of a different material. 3. The face plate is made of pure titanium, the head body is made of stainless steel, and the filler material is 30.
3. The golf club head according to claim 2, wherein the head has a three-layer structure in which a silver-based brazing layer containing not more than 30% by weight of copper is sandwiched by the silver-based brazing layer containing not more than 30% by weight of copper. 4. The plurality of members include a weight member constituting a part of a back portion or a sole portion of a head, and a head body constituting a portion other than the weight member of the head, wherein the weight member comprises: 2. The golf club head according to claim 1, wherein the specific gravity is greater than a material constituting the head body, and the head body is formed of a different material. 5. The weight member is made of a tungsten alloy, the head body is made of a titanium alloy, and the filler material is a silver-based braze containing 30% by weight or less of copper or a copper layer containing 30% by weight or less of copper. 5. The golf club head according to claim 4, wherein the head has a three-layer structure sandwiched by silver-based brazing layers containing: 6. The plurality of members are a face plate forming a part of a face portion of a head, a weight member forming a portion of a back portion or a sole portion of the head, and a head other than the above. 2. The golf club head according to claim 1, wherein the specific gravity of a material constituting the members has a relationship of weight member> head body> face plate, and is formed of different materials. 7. The face plate is made of pure titanium, the head body is made of stainless steel, and a filler material between the two members is a pure silver braze or a copper layer sandwiched between the pure silver braze layers.
7. The layered structure according to claim 6, wherein the weight member is made of a tungsten alloy, and a filler material between the head body and the weight member is a silver-based solder containing 30% by weight or less of copper. Golf club head. 8. A method for manufacturing a golf club head formed by joining a plurality of members, wherein a filler material is provided between joints of the members to be joined, The plurality of members are joined and integrated by heating to a temperature below the transformation temperature of the members to be joined and the temperature at which the filler material melts, and wetting the filler material to the joining portions of the members. Of manufacturing a manufactured golf club head. 9. The head body made of stainless steel and another member formed of a different material from the head body, wherein the plurality of members include a head body made of stainless steel and another member made of the different material. 9. The method for manufacturing a golf club head according to claim 8, wherein metal plating is applied to a portion where the member is joined.