JPS61185282A - Iron type club head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an iron-type club head including a sand club head and a pitching wedge.

[Conventional technology]

Conventional iron-type club heads increase the moment of inertia by forming a concave portion in the center of the back side and arranging a corresponding amount of material around the periphery of the head.

Alternatively, the moment of inertia can be reduced by embedding metal such as tungsten, which has a higher specific gravity than steel, near the toe or heel of the head, or by making the inside of the head hollow to distribute more weight around the head. was increasing.

[Problem that the invention seeks to solve]

NO93 Conventional club heads of any shape or structure have already reached their limits in reducing the thickness of the face surface due to constraints on strength and feel when hitting.

Therefore, the moment of inertia cannot be increased any further.

[Means for solving problems]

The iron-type club head of the first invention includes a saucer-shaped club head body made of a steel-based metal material with a concave portion formed from the back surface and a plate-like portion of a predetermined thickness left on the face surface;
The club head body is made up of a lightweight composite casting made by filling the concave portion of the club head body with fibrous bodies or whiskers, injecting molten light metal and solidifying the same, and integrating the product into the club head body.

The iron-type club head of the second invention includes a club head body made of a steel-based metal material forming a window penetrating from the back surface to the face surface; and a fibrous body or whiskers in the window portion of the club head body. A lightweight composite casting body is formed by filling, injecting and solidifying molten light metal and integrating it into the club head body.

[Effect]

The weight near the center of gravity of the club head can be reduced and the reduced weight can be distributed to the periphery. Moreover, the thickness of the central portion of the face surface is sufficiently large. However, due to the fibers or whiskers in the lightweight composite casting, the overall coefficient of thermal expansion can be lowered, approaching that of steel, even if aluminum-based light metals with a high coefficient of thermal expansion are used.

〔Example〕

The present invention will be explained in more detail below based on the illustrated embodiments.

1 and 2 show an example of an iron-type golf club head. A club head 2 connected to a shaft 1 is composed of a club head body 3 made of a steel-based metal material, and a lightweight composite casting body 5 embedded in the back surface 4 of the club head body 3.

Specifically, as shown in FIGS. 1 to 5, a concave portion 6 is formed in the club head body 3 from the back surface 4, and a plate-like portion 8 with a predetermined thickness T is formed on the face surface 7. It is formed into a saucer shape. A peripheral wall portion 9 is therefore formed around the periphery. This concave portion 6 is formed by forging or casting, or by mechanical cutting.

, As shown in FIG. 3, the love head main body 3
A whisker 10, which is a needle-shaped perfect crystal, is placed in the concave portion 6 of the
When packed in the direction of the arrow, the state shown in Figure 4 will be obtained. Thereafter, as shown in FIG. 5, it is placed in a mold 11, and molten light metal M is injected under vacuum to solidify. After solidification, the back surface of the casting is finished to form a lightweight composite casting 5 integrated with the rub head body 3 as shown in FIG.

Preferably, the minimum value of the wall thickness T of the plate-shaped portion 8 is 1.0 to 3.
It is best to set it to 0mm. Further, as the whisker 10, silicon carbide (SiC), Al! z O3,B
e05B4C1si2N2. Graphite, Cr+F
e+ N++ Use carbon, etc. Furthermore, fibrous bodies made of these various materials can also be used if desired. Furthermore, two or more types can also be used in combination. (Note that the "minimum value" of the wall thickness T refers to the minimum value when the plate-like portion 8 has an uneven wall thickness.) The light metal M injected in the above-mentioned molten state is aluminum or an aluminum alloy. , magnesium silica NO16, magnesium alloy, titanium, titanium alloy, etc. can be used.

For example, when using a combination of aluminum or aluminum alloy and SiC whiskers in the lightweight composite casting 5, the volume content of the SiC whiskers is 10 to 35%.
The range shall be . In particular, a range of 15 to 30% is desirable. If it is set to 15 to 30%, the coefficient of thermal expansion of the lightweight composite casting body 5 will be closest to that of the club head body 3 made of iron or stainless steel, and there is an advantage that increase in product cost can be suppressed. .

Next, in another embodiment shown in FIG.
2 is formed. As shown in FIG. 7, in the manufacture of the club head body 3, a
Filled with the above-mentioned fibrous body or whiskers 10, under vacuum,
The above-mentioned molten light metal M is injected and solidified to form the club head body 3.
A lightweight composite casting body 5 is formed in the middle part of the head.

In the case of Fig. 7, the mold 11 is essential, but in No. 5,
7 In the figure, the mold 11 can be simplified or completely omitted.

The whiskers 10 are acicular perfect crystals without defects such as dislocations, and have excellent material properties such as high strength, high elastic modulus, and light weight.

〔Effect of the invention〕

The present invention exhibits the following significant effects due to the configuration described in -L.

(1) As shown in Fig. 2, under the condition that the overall weight of the club head 2 is the same as that of the conventional club head, the mass distribution at the outer peripheral edge increases, and It was possible to increase the moments of inertia (moments of inertia around the horizontal axis X) Mz and Mx. Specifically, the moment of inertia was increased by 5 to 25% compared to the conventional model. Therefore,
The sweet spot is increased, and deviations in the ball launch direction due to misshots and fluctuations in the launch direction due to slices and hooks can be significantly reduced. In this way, the directionality of the ball can be improved, and furthermore, the decrease in the initial velocity of the ball upon a misshot can be minimized.

(11) The coefficient of thermal expansion of aluminum, aluminum-based alloy, etc. in the lightweight composite casting body 5 is large, and if used alone as is, the recessed portion 6 or window portion 12 of the club head body 3 made of steel-based metal material will A "gap" is generated between the inner peripheral surface and the inner peripheral surface. However, in the present invention, by mixing the whiskers 10 and fibers, it is possible to achieve a coefficient of thermal expansion close to that of steel, prevent the above-mentioned "gaps" from occurring, and have high durability.

(III) If the concave portion is visible on the back surface of the club head as in the past, it is inevitable that the club head will give the impression that it is suitable for beginners or that it is a cheap product. In the present invention, the back portion 4 is also thick, giving an image of elegance and luxury.

(TV) When the club head body 3 is made of stainless steel, the lightweight composite cast body 5 absorbs vibrations when hitting the ball, making the hitting feel "soft" and providing a good hitting feeling similar to soft iron. can get.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view No. 99 showing one embodiment of the first invention, Fig. 2 is a perspective view thereof, and Figs. 3, 4, and 5 are cross-sectional explanatory views sequentially showing an example of the manufacturing method thereof. , Figure 6 is the second
FIG. 7 is a cross-sectional view showing an example of the manufacturing method thereof. T... Wall thickness, 3... Club head body, 4... Back part, 5... Light weight composite casting, 6... Recessed part, 7...
...Face surface, 8...Plate-shaped part, 12... Window part. Patent Applicant Sumitomo Rubber Industries Co., Ltd. Procedural Amendment Law Total RO 60 March 29, 1985 Patent Application No. 25698 2 Title of invention Iron-type club head 3 Relationship to the amended person case Patent Applicant name: Sumitomo Rubber Industries, Ltd. 4, I [853
0M (06) 344-0177 2 Umeda, Kita-ku, Osaka
Chome 5-8 Chiyoda Building Nishioki 1 Building 6, subject to correction -21-

Claims (1)

[Claims] 1. A saucer-shaped club head body 3 made of a steel-based metal material with a concave portion 6 formed from the back surface 4 and a plate-like portion 8 with a predetermined thickness T left on the face surface 7; , a lightweight composite casting 5 formed by filling the concave portion 6 of the club head body 3 with fibrous bodies or whiskers, injecting and solidifying molten light metal, and integrating the resulting product into the club head body 3. Iron type club head. 2. The minimum value of the predetermined thickness T of the plate-shaped portion 8 is set to 1.0 to 3.
An iron-type club head according to claim 1, wherein the diameter is set to 0 mm. 3. A club head main body 3 made of a steel-based metal material having a window 12 penetrating from the back surface 4 to the face surface 7, and filling the window 12 of the club head main body 3 with fibers or whiskers and melting them. An iron-type club head characterized by comprising: a lightweight composite casting body 5 formed by injecting and solidifying a light metal and integrating it into the club head body 3.