JP2004057645A - Golf club head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club head, heightening the peripheral strength of a face part of an enlarged head and having good hitting durability. <P>SOLUTION: This golf club head includes a face member 10 where a face part 2 and an extension part 11 extended from the peripheral edge part of the face part 2 toward the rear of the head are integrally formed, and a back member joined to the end of the extension part of the face member 10 to form a hollow part. The inside peripheral edge part 12 which is a boundary between the face part 2 of the back 10a of the face member and the extension part 11, is provided with a thick part 13 formed at a part of the inside peripheral edge part 12 to be thicker than the other parts. <P>COPYRIGHT: (C)2004,JPO

Description

○：問題なし。×：亀裂発生。
【００２７】
表１に示すように、比較例のゴルフクラブヘッドは１０００球の時点での確認時に、フェース部２のの周縁に亀裂が発生しており、実施例のゴルフクラブヘッドは、その後、７０００球まで打球を続けたが、亀裂が発生しなかったため試験を中止した。したがって、本実施例の厚肉部が形成されたゴルフクラブヘッドは、打撃の衝撃力によって生じる応力に対して、優れた応力緩和効果が得られるという結果が得られた。
【００２８】
【発明の効果】
以上のように、本発明のゴルフクラブヘッドは、フェース部材の内側周縁部の少なくとも一部に他の部分よりも肉厚が大の厚肉部が形成されていることから、ヘッドが大型で薄肉とされた場合でも、撓みを出来るだけ大きく維持した上で、フェース部の周辺の強度を向上させ、ボール打撃時の衝撃に耐えうる強度を付与することが可能になる。しかも、厚肉部を内側周縁部の必要な部分のみに形成するので、重量の無駄な増加がなくヘッド重量の増加を防ぐことが出来る。
【図面の簡単な説明】
【図１】本発明のゴルフクラブヘッドを示す全体斜視図。
【図２】ゴルフクラブヘッドの分割構造を示す説明図。
【図３】フェース部材の構造を示す説明図。
【図４】図３のＡ−Ａ線断面図。
【図５】図３のＢ−Ｂ線断面図
【図６】フェース部材の製造方法の説明図。
【図７】従来のゴルフクラブヘッドの説明図。
【図８】従来のゴルフクラブヘッドの説明図。
【図９】従来のゴルフクラブヘッドの説明図。
【図１０】従来のゴルフクラブヘッドの説明図。
【図１１】従来のゴルフクラブヘッドの説明図。
【符号の説明】
１　ゴルフクラブヘッド
２　フェース部
２ａ　スコアライン
３　クラウン部
４　ソール部
５　サイド部
６　ホーゼル部
７　ヒール
８　トウ
１０　フェース部材
１０ａ　裏面
１１　延出部
１２　内側周縁部
１２ａ　外側周縁部
１３　厚肉部
１４　上端
１５　下端
１６　中央部
１７　境界部
２０　バック部材
２１　開口部
３１　フェース面殻部
３２　上面殻部
３３　ソール殻部
３４　測周殻部
３５　シャフト取付部
３６　シャフト先端部
３７　溶接部
４１　フェース部
４２　ホーゼル部
４３　延出部
４４　フェース側部材
４５　バック側部材
４６　周縁部
５０　上金型
５１　下金型
５２　厚肉成形部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a golf club head, and more particularly to an improvement in the structure around the face portion of a golf club head.
[0002]
[Prior art]
Conventionally, in a wood-type metal golf club head, the entire head is divided into a plurality of parts, and the outer shell members constituting each are formed by pressing or forging, and then these members are joined by welding or the like. Forms the body.
[0003]
For example, as disclosed in Japanese Utility Model Publication No. 61-33972 shown in FIG. 7, the face surface shell portion 31, the upper surface shell portion 32, the sole shell portion 33, and the measuring shell portion 34 are separately formed by press working. A three-piece golf club head is disclosed in which members are integrated by welding to form a golf club head, and a shaft tip portion 36 is attached to and integrated with a formed shaft mounting portion 35.
[0004]
However, in the golf club head disclosed in the Japanese Utility Model Publication No. 61-33972, the peripheral edge of the face surface shell portion 31, the upper surface shell portion 32 welded to the peripheral edge of the face, and the upper surface shell periphery of the sole shell portion 33. As shown in FIG. 8, the sole periphery is welded in the form of a corner joint, and the welded portion 37 is joined in a bent state.
For this reason, a compressive stress acts on the welded portion 37 due to an impact force at the time of impact, and a bending stress also acts due to an arcuate deformation of the face surface shell portion 31. And the problem that it breaks from the welding part 37 by the effect | action of this bending stress generate | occur | produced. Therefore, the conventional golf club head has a problem in the durability of the welded portion 37 on the peripheral edge of the face surface shell portion 31.
[0005]
As a measure for solving the above-mentioned problem, for the purpose of improving durability against hitting balls, it is shown in FIG. 9 and disclosed in Japanese Patent Laid-Open No. 5-317467, and also shown in FIG. A two-piece golf club head as disclosed in Kaihei 6-80455 and a method for manufacturing these golf club heads are disclosed.
[0006]
The golf club head is characterized by a face part 41, a face side member 44 integrally formed with an extension part 43 and a hosel part 42 extending rearward from the face part 41, and the face side member 44. The hosel part 42 is formed by forming a plate-like member continuous with the face part 41 and the extension part 43 into a cylindrical shape and welding the butted parts. It is a thing.
[0007]
[Problems to be solved by the invention]
Recently, in order to improve the flight distance and direction of the hit ball, the golf club head has been mainly used in which the volume of the golf club head is increased to increase the moment of inertia at the time of hitting. Tend to be thinner. Therefore, in the conventional golf club head, the impact resistance characteristics when used for a long time cannot be said to be sufficient, and stress concentrates on the peripheral edge 46 which is the boundary between the extending portion 43 and the face portion 41, Problems such as breakage occurred.
[0008]
In addition, as shown in FIG. 11, it is not easy to make the polishing amount constant when the shape of the outer side of the peripheral edge portion 46 of the face portion 41 is set. For example, it is excessively cut with respect to the target shape line n. For example, there is a possibility that the thickness of the peripheral edge portion 46 becomes thin, and thus there is a problem that the hit ball durability is lowered.
[0009]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a golf club head that solves the above-described problems, increases the peripheral strength of the face portion of the enlarged golf club head, and has good hit ball durability.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a golf club head according to a first aspect of the present invention is a metal golf club head having a hollow portion therein, and the face portion and a peripheral portion of the face portion are arranged behind the head. A golf club head comprising: a face member integrally formed with an extending portion extending toward the end; and a back member joined to an end portion of the extending portion of the face member to form the hollow portion. A golf club head characterized in that a thick part having a larger thickness than other parts is formed on at least a part of the inner peripheral edge of the member.
[0011]
A golf club head according to a second aspect of the present invention is the golf club head according to the first aspect, wherein the thick portion is formed over at least one of an upper end side and a lower end side of the face portion. A golf club head.
[0012]
A golf club head according to a third aspect of the present invention is the golf club head according to the first or second aspect, wherein the thick portion is formed to change according to the position of the inner peripheral edge. The golf club head is characterized.
[0013]
A golf club head according to a fourth aspect of the present invention is the golf club head according to the first aspect, wherein the thick portion is a curved surface smoothly curved in a cross-sectional shape extending from the face portion to the extending portion. A golf club head characterized by being formed.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an overall perspective view showing a wood type golf club head according to one embodiment of the present invention, FIG. 2 is an explanatory view showing a divided structure of the golf club head 1, and FIG. It is explanatory drawing shown from an inner peripheral surface side. 4 is a longitudinal sectional view taken along the line AA in FIG. 3, an explanatory view showing the sectional shape of the thick portion, and FIG. 5 is a lateral view taken along the line BB in FIG. FIG. 6 is a cross-sectional explanatory view in a direction, and is an explanatory view of a state in which a thick portion is formed by being continuously changed according to the position of the inner peripheral edge. FIG. 6 is an explanatory diagram of the manufacturing method of the face member 10.
[0015]
As shown in FIG. 1, a golf club head 1 has an outer shell structure having a hollow portion therein, and is equipped with a face portion 2, a crown portion 3, a sole portion 4, and a shaft extending rearward from the face portion 2. And a side portion 5 that connects the sole portion 4 to the crown portion 3 and the hosel portion 6. Also, one side in the left-right direction toward the face portion 2 is referred to as a toe 8 and the other side is referred to as a heel 7. The face portion 2 is formed with a plurality of concave groove-like score lines 2a.
[0016]
As shown in FIG. 2, the golf club head 1 includes a face member 10 made of a metal material such as titanium, a titanium alloy, or stainless steel, and a back member 20 made of the same or different metal material as the face member 10. While being divided | segmented, it has the structure formed by mutually joining these members 10 and 20 by welding etc.
The face member 10 is integrally formed by forging, casting, or the like, and has a structure including a face portion 2 and an extending portion 11 extending rearward from the peripheral edge portion of the face portion 2 in the hitting direction.
[0017]
The back member 20 may be a single member formed integrally or may be a combination of a plurality of members.
[0018]
FIG. 3 is a view showing the face member 10 from a direction opposite to that in FIG. As shown in FIG. 3, at the inner peripheral edge 12, which is the boundary between the face part 2 and the extending part 11, on the back surface 10 a of the face member 10, at least a part of the inner peripheral edge 12 is more than other parts. A thick portion 13 having a large thickness is formed.
[0019]
The thick-walled portion 13 is formed on a portion of the peripheral portion 12 of the face portion 2 where the durability of the peripheral portion of the face portion 2 is concerned due to the thickness of the extending portion 11 or the shape of the golf club head. It is desirable to form over a region of 20 to 60%.
If the area where the thick part 13 is formed is less than 20% of the total length of the inner peripheral edge 12 of the face part 2, there is a possibility that the reinforcing area is reduced and the face part 2 is dented and cracked. There is no contribution to improving durability. On the other hand, if it exceeds 60%, the weight of the golf club head tends to increase significantly, such being undesirable.
For example, when the extending part on the crown part side is formed thin, the thick part 13 is formed on the upper end 14 side of the face part 2 or the extending part on the sole part side is formed thin. The thick portion 13 can be formed on the lower end 15 side of the face portion 2. Further, when the head is a large head exceeding 400 cc, the entire extension portion is formed thin, so that it can be formed on the toe or heel side.
[0020]
In this way, even if the head is large and thin by forming the thick portion 13 having a large thickness at the portion of the inner peripheral edge 12 that is concerned about durability, it is desired to reinforce the face portion 2. While maintaining the deflection as large as possible, the strength around the face portion 2 can be improved and the strength capable of withstanding the impact at the time of hitting the ball can be provided. In addition, since the thick portion 13 is formed only in the necessary portion of the inner peripheral edge portion 12, there is no wasteful increase in weight, and an increase in head weight can be prevented.
[0021]
Further, as shown in FIG. 4, the thick portion 13 has a curved surface in which the shape of the inner peripheral edge portion 12 is smoothly curved with a predetermined radius of curvature R1 in the cross-sectional shape from the face portion 2 to the extending portion 11. Can be formed. For example, the radius of curvature R1 of the thick portion 13 is set to be larger than the radius of curvature R2 of the outer peripheral edge 12a.
Therefore, since the curvature radius R1 of the inner peripheral edge 12 is smoothly curved and the wall thickness is changed, the stress concentration caused by the impact force of the impact can be reduced.
[0022]
In the present embodiment, the thickness of the thick portion 13 may be formed so that the thickness of the thick portion 13 is substantially constant, and the thick portion 13 is located at the position of the inner peripheral edge portion 12. By changing and forming according to the above, weight distribution and design of the golf club head 1 can be performed together.
For example, as shown in FIG. 5, the thickness of the thick portion 13 is reduced from the vicinity of the central portion 16 of the thick portion 13 toward the heel and toe sides, thereby forming the face portion more flexibly. Therefore, a large repulsive force is generated, and a flying distance loss of the ball is prevented.
Further, by increasing the thickness of the thick portion 13 on the lower end 15 side, the center of gravity of the head can be lowered when the weight of the thick portion 13 on the lower end 15 side is increased. Thus, it is possible to provide a golf club head in which the ball is likely to rise.
[0023]
In addition, the thick part 13 of a present Example has illustrated the thing from which the boundary part 17 with the inner peripheral part 12 reduces thickness gradually toward the said inner peripheral part 12. FIG. Thereby, it is possible to effectively prevent the golf club head 1 from having a large rigidity step and to prevent stress from being concentrated on the boundary portion 17.
[0024]
Next, a method for manufacturing the golf club head 1 will be described.
The face member 10 is manufactured by forging, pressing, or casting.
For example, in the case of forging, as shown in FIG. 6, the face member 10 is formed by the upper and lower molds 50 and 51 using a forging apparatus.
In the lower mold 51 for forming the face member 10, a thick forming portion 52 for forming a thick portion is formed in advance.
Then, a heated metal material such as titanium, titanium alloy, or stainless steel is set in the lower mold 51.
Next, the upper die 50 comes into contact with the lower die 51 and is pressed to forge the metal material. Thereafter, the forged product is taken out from the lower die 51 and subjected to processing such as deburring, polishing, and shot blasting. Thus, the face member 10 is formed.
The face member 10 is formed by one or a plurality of forging processes.
2, the face member 10 forged as described above and the back member 20 formed by casting or forging are combined with the face member 10 in the opening 21 of the back member 20. In FIG. 2, after joining the two together by welding, the outer surface of the weld bead is polished to obtain a desired head shape, whereby the golf club head 1 is obtained.
[0025]
【Example】
As shown in FIGS. 1 and 2, the golf club head of the present embodiment joins both a face member 10 obtained by forging a titanium alloy plate material and a back member 20 formed by casting by welding, A wood-type golf club head 1 was formed.
The thickness of each outer shell portion of the golf club head 1 was 2.8 mm for the face portion, 1.5 mm for the sole portion, and 1.2 mm for the crown portion.
Further, on the inner peripheral edge portion 12 of the back surface 10 a of the face member 10, thick portions 13 are formed on the upper end 14 side and the lower end 15 side of the central region of the face portion 10.
Then, the golf club is attached to an endurance tester that continuously hits the ball, the head speed is set to 50 m / s, the hitting position is set to the face center, and the hitting is continued continuously. A test was conducted to confirm the durability until the golf club head breaks by confirming the occurrence of cracks and fractures around the face contour ridgeline.
For comparison, a golf club head having the same structure as that of the golf club head 1 of the above embodiment but having no thick portion was formed, and a hit durability test was similarly conducted. Table 1 shows the test results.
[0026]
[Table 1]

○: No problem. X: Crack generation.
[0027]
As shown in Table 1, when the golf club head of the comparative example was confirmed at the time of 1000 balls, a crack occurred at the periphery of the face portion 2, and the golf club head of the example was up to 7000 balls thereafter. Although hitting was continued, the test was stopped because no crack occurred. Therefore, the golf club head in which the thick portion of the present example was formed obtained a result that an excellent stress relaxation effect was obtained with respect to the stress generated by the impact force of hitting.
[0028]
【The invention's effect】
As described above, the golf club head of the present invention has a large-sized, thin-walled head because a thick-walled portion having a larger thickness than other portions is formed on at least a part of the inner peripheral edge of the face member. Even in such a case, it is possible to increase the strength of the periphery of the face portion while maintaining the deflection as large as possible, and to give the strength capable of withstanding the impact at the time of hitting the ball. In addition, since the thick wall portion is formed only in a necessary portion of the inner peripheral edge portion, there is no wasteful increase in weight and an increase in head weight can be prevented.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing a golf club head of the present invention.
FIG. 2 is an explanatory view showing a divided structure of a golf club head.
FIG. 3 is an explanatory view showing the structure of a face member.
4 is a cross-sectional view taken along line AA in FIG.
5 is a cross-sectional view taken along line BB in FIG. 3. FIG. 6 is an explanatory diagram of a method for manufacturing a face member.
FIG. 7 is an explanatory diagram of a conventional golf club head.
FIG. 8 is an explanatory diagram of a conventional golf club head.
FIG. 9 is an explanatory view of a conventional golf club head.
FIG. 10 is an explanatory diagram of a conventional golf club head.
FIG. 11 is an explanatory diagram of a conventional golf club head.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Golf club head 2 Face part 2a Score line 3 Crown part 4 Sole part 5 Side part 6 Hosel part 7 Heel 8 Toe 10 Face member 10a Back surface 11 Extension part 12 Inner peripheral edge part 12a Outer peripheral edge part 13 Thick part 14 Upper end 15 Lower end 16 Central portion 17 Boundary portion 20 Back member 21 Opening portion 31 Face surface shell portion 32 Upper surface shell portion 33 Sole shell portion 34 Measuring shell portion 35 Shaft mounting portion 36 Shaft tip portion 37 Welding portion 41 Face portion 42 Hosel portion 43 Extension portion 44 Face-side member 45 Back-side member 46 Peripheral part 50 Upper mold 51 Lower mold 52 Thick-walled molded part

Claims (4)

A metal golf club head having a hollow portion therein, a face member integrally formed with a face portion and an extending portion extending from the peripheral portion of the face portion toward the rear of the head, and the face member In a golf club head comprising a back member joined to the end of the extension part to form the hollow part, at least a part of the inner peripheral edge part of the face member has a larger thickness than the other part. A golf club head, wherein a thick portion is formed. 2. The golf club head according to claim 1, wherein the thick part is formed over at least one of an upper end side and a lower end side of the face part. 3. The golf club head according to claim 1, wherein the thick portion is formed so as to change according to the position of the inner peripheral edge. 2. The golf club head according to claim 1, wherein the thick portion is formed into a curved surface that is smoothly curved in a cross-sectional shape from the face portion to the extending portion.

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