JP2000350799A - Golf iron club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase back spin and to maintain the back spin performance for a long time by providing a porous sintered metal face part on the head face of an iron club. SOLUTION: A multiporous sintered metal face part 3 (hereafter called face part 3) is provided on the iron face 2 of an iron head 1 by adhesion. This face part 3 is stainless steel based, and is formed by compressing a coarse metal powder of about 20-60 mesh to a density of about 5.0-6.3 g/cm3, and sintering this. At that time, except providing the face part 3, everything is the same as a conventional club. In forming this face part 3, grooves 5 are formed by machining or molding by a mold. The surface layer is finished by polishing, is given abrasion resistance equivalent to melt-made material by the filling effect. Thereby the free part 9 between powders in the face part 3 absorbs the impact in hitting a ball and back spin can be made easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to irons 2 to 9;
Related to golf iron clubs such as pitching wedges, approach wedges and sand wedges, maintaining good frictional properties against golf balls even after long-term use,
The present invention relates to a golf ball having a golf iron face that increases the amount of back spin on a golf ball.

[0002]

2. Description of the Related Art Iron-based, stainless-based, titanium-based, or other molten materials, that is, materials used by melting, are used for the faces of conventional golf iron clubs. These are all hard and have sufficient abrasion resistance, but are inferior in friction, so that the golf ball has the friction required to give backspin to the golf ball. In other words, the number of grooves, the width of the grooves, the distance between the grooves, and the like are determined, and the provision of grooves corresponding to these is permitted.

[0003]

However, since the edges of the grooves formed in the face wear in proportion to the frequency of use, it is necessary to reduce the friction coefficient in order to maintain a constant back spin on the ball. In order to increase the size, additional processing of the groove side surface is required, such as sharpening the side surface of the groove with a file.

However, a certain standard is determined for the groove width of the face and the pitch between the grooves, and if additional processing is repeated, for example, the width of the groove becomes large and deviates from the standard. This means that there is a limit to the amount that can be additionally processed.

Accordingly, an object of the present invention is to improve the problem by not only increasing the amount of backspin on the ball but also maintaining the increased amount of backspin for a long time. -9-iron, pitching wedge, approach wedge and sand wedge.

[0006]

FIG. 1 shows the principle of the present invention. In FIG. 1, 1 is an iron head, 2 is an iron face, 3 is a porous sintered metal face portion, 4 is an adhesive layer, 5 is a groove, and 6 is a golf ball.

The above object of the present invention can be achieved by the following constitutions. (1) In a golf iron club, a porous sintered metal face portion made of a porous sintered metal material is provided on the face of the head.

(2) In the golf iron club of (1), the porous sintered metal face portion is provided on a part of the face surface of the head.

(3) In the golf iron club according to the above (1) or (2), the porous sintered metal face portion is formed by subjecting to a finish processing after a shot peening. And

(4) In the golf iron club of (1) to (3), a groove is formed in the porous sintered metal face portion.

Based on this, the following operation and effect can be obtained. (1) Since the porous sintered metal face portion made of a porous sintered metal material is provided on the face of the head of the golf iron club, the golf ball is partially released when the golf ball is hit. Irregularities are generated while the surface of the porous sintered metal follows the surface of the golf ball, and as a result, the frictional property is increased and a large back spin can be easily applied.

(2) Since the porous sintered metal face portion is provided on a part of the face of the head, a golf iron club having the same function can be manufactured at a lower cost than when a large portion of the face surface is formed by the porous face portion. Can be provided.

(3) Since the porous sintered metal face portion can be made to have a high density by shot peening and the sharp edge state of the edge portion can be maintained even after long-term use, excellent friction can be obtained. The force can be maintained for a long time. Moreover, since the thickness and density distribution of the surface layer, which is increased in density by the shot speed and time of shot peening, can be controlled, the porous sintered metal face of the same material can be subjected to different impact strengths such as iron, pitching wedge, approach wedge, It can be used for sand wedges and the like.

(4) A groove is formed in the porous sintered metal face portion, and when a golf ball is hit at the edge of the groove, irregularities follow the ball surface to increase friction. Therefore, the friction property is greatly improved, and a large backspin can be applied very easily.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. 1 to 4, taking a pitching wedge as an example. 1A and 1B show an embodiment of the present invention, in which FIG. 1A is a sectional view of an iron head, FIG. 1B is an enlarged view of a portion A in FIG. 1A, and FIG. FIG.
FIG. 2 is an external view of an embodiment of the present invention.
(A) is a side view of the head, (B) is a top view of the head, FIG. 3 is an explanatory view of a manufacturing process, and FIG. 4 is an explanatory view of a powder state.

1 and 2, reference numeral 1 denotes an iron head;
2 is an iron face, 3 is a porous sintered metal face portion, 4 is an adhesive layer, 5 is a groove, 6 is a golf ball, and 7 is a shaft.

In the golf iron club of the present invention, FIG.
As shown in FIG. 1A, a porous sintered metal face portion 3 is provided on a surface of an iron head 1 on which a golf ball is hit, that is, on an iron face 2.

The porous sintered metal face 3 is formed by compressing a stainless steel coarse metal powder of 20 to 60 mesh to a density of 5.0 to 6.3 g / cm ³ as described later. Formed of a porous sintered metal material. Incidentally, the density of stainless steel is about 7.8 g / cm ³ .

The golf iron club of the present invention has the same configuration as a conventional golf iron club except that a porous sintered metal face portion is provided on the iron face 2. That is, as shown in FIG. 2 (B), the iron head 1 has a shaft 7 inserted and fixed in a hole at the end thereof, and as shown in FIG. 2 (A), the shaft 7 and the iron face 2 have a loft angle. It is referred to as, for example, a 2-iron, a 9-iron, a pitching wedge, or an approach wedge depending on the magnitude of the loft angle θ.

An example of a manufacturing process of the porous sintered metal face portion 3 used in the present invention will be described with reference to FIGS.

(1) As shown in FIG. 4 (A), a mold portion 11 formed in the center is placed in a mold 10 having the same shape as the porous sintered metal face portion 3 as shown in FIG. 4 (B). , Upper punch 1
2 and the lower punch 13 are arranged, and the metal powder 14 constituting the porous sintered metal face portion 3 is placed in the mold portion 11. For example, the upper punch 12 is moved to the position of 12 ′,
Compact. As the metal powder 14, for example, a 20 to 60 mesh stainless steel powder is used, and the powder after sintering is compacted to a density of 5.0 to 6.3 g / cm ³ .

(2) The compact is placed in a tray and sintered at a temperature of 1100 to 1250 ° C. in a reducing atmosphere, for example, pure H ₂ .

(3) A groove 5 is formed on the surface of the sintered product by machining. (4) The grooved product is bonded to the iron. As the adhesive, for example, an epoxy resin-based adhesive is used.

(5) The surface of the sintered body is polished so that the height of the surface of the bonded sintered body and the surface of the iron are uniform. (6) After that, finish by buffing to remove polishing scratches.

In the above description, an example in which a stainless steel powder is used as the metal powder 14 has been described. However, the present invention is not limited to this, and iron powder may be used.

As a sintering atmosphere, pure H_TwoUsing gas
Was explained, but of course it is limited to this.
But not N_TwoH mixed gas_TwoYou can use gas
No. N _TwoWhen gas is mixed, the grain boundaries on the surface become hard.
If the surface is harder,_Twogas
Should be mixed.

The groove 5 can be formed by a mold instead of by machining.

The surface can be shot peened for the reasons described below.

In the present invention, the iron face is made of a porous sintered metal material as shown in the enlarged cross section of FIG. The surface layer is polished and has the same abrasion resistance as that of the molten material due to the crushing effect.

However, the metal powder used is a coarse material such as stainless steel or iron of 20 to 60 mesh, and the density is 7.8 to 7.9 g / c in the case of stainless steel.
m ³ is set as low as 5.0 to 6.3 g / cm ³ . Even when iron is used, the density of iron is about 7.9 g / cm ³
And similarly set to a lower density.

For this reason, in the inside of the porous sintered metal face portion 3, sintering between the powders does not sufficiently proceed, and as shown in FIG. , Partially free.

When the golf ball 6 is hit against the iron face in this state, the impact when the loose portion 9 is hit is absorbed, and as shown by F in FIGS. 1B and 1C, the golf ball 6 is hit. While following the surface, the free powder escapes to form irregularities on the iron face. As a result, the frictional property increases, and the backspin is easily applied. In particular, the impact force increases at the edge of the groove 5 so that the golf ball can easily enter.
This unevenness effect is large, and back spin is easily applied.

By the way, in order to obtain a reversible effect which does not cause plastic deformation even after long-term use and can obtain the effect repeatedly,
Porous sintered metal face part 3 by impact received at the time of hitting ball
Needs to be selected. It is an object of the present invention to obtain a golf ball capable of increasing the backspin amount in order to accurately stop at a target position even at the expense of a flight distance of a hit ball.
Therefore, it is not suitable for a driver, and is suitable for 2-9 irons, pitching wedges, approach wedges, sand wedges, etc., which are required to stop at a target position with less impact and are accurate. In the specification of the present invention, the golf iron club includes those.

In particular, since there is little impact, a low-density porous sintered metal face portion is effective because a reversible effect can be obtained by a usable pitching wedge.

When it is desired to use the material on the low density side also for high impact, the density of the surface layer of the porous sintered metal face 3 is increased by shot peening by hitting small balls, and then the final polishing is performed. It should be applied.

Since the thickness and density distribution of the surface layer to be densified can be controlled by the shot speed and time of shot peening, the same material can be used for 2 to 9 irons, pitching wedges, approach wedges and sand wedges. Becomes

When the surface layer density is the same, the lower the internal density, the higher the degree of conformity to the ball surface when the golf ball surface receives an impact, and the higher the frictional property.

In the case where the surface layer is densified by shot peening, the edge portion can easily enter the golf ball, and this effect can be maintained, so that high friction can be maintained.

Further, it is possible to provide a material which has a soft feel and is very easy to use.

The porous sintered metal face portion in the present invention has water permeability, and can absorb water droplets on the iron face surface depending on the degree of polishing of the surface layer.
As shown in (1), when the water droplets 8 are present in the grooves, and when the grooves are formed by the mold, the water droplets 8 can be almost completely absorbed as shown by arrows. For this reason, even in the wet state, a water film is not easily formed between the golf ball surface and the iron face surface, and the decrease in friction in the wet state can be reduced.

The face of the porous sintered metal face is polished so that "stain" peculiar to the sintered material is hardly observed. However, for example, 5.0 g /
When a material having a low density such as cm ³ is used, the effect of crushing by polishing is not sufficient, and “stain” which is a problem in appearance tends to remain.

In this case, by performing shot peening on the face surface as an auxiliary, crushing the face to a certain extent, and then polishing and finishing, it is possible to make the "su" almost invisible.

Table 1 shows back spin amount comparison test data in the case where the present invention is applied to a pitching wedge and in a conventional pitching wedge.

When the back spin amount was tested with a dry ball and a wet ball at loft angles θ of 50 ° and 53 °, the average spin amount according to the present invention and the conventional one were shown in Table 1. Data are obtained, and it can be seen that the present invention is superior by 12% or more.

[0045]

[Table 1]

A second embodiment of the present invention will be described with reference to FIG. In the first embodiment of the present invention, the example in which the porous sintered metal face portion 3 is provided on almost the entire surface of the iron face 2 has been described. However, in the second embodiment of the present invention, FIG. As shown, the porous sintered metal face portion 3 is provided only in a portion of the iron face 2 which has the highest degree of contact with the golf ball.

Thus, even if the expensive porous sintered metal face portion is formed with a small area, the same effect as that of the first embodiment of the present invention can be obtained.

[0048]

According to the present invention, the following effects can be obtained. (1) Since the porous sintered metal face portion made of a porous sintered metal material is provided on the face of the head of the golf iron club, the golf ball is partially released when the golf ball is hit. Irregularities occur while the surface of the porous sintered metal follows the surface of the golf ball, and as a result, the frictional property increases, and a large back spin can be easily applied.

(2) Since the porous sintered metal face portion is provided on a part of the face of the head, a golf iron club having the same function can be manufactured at a lower cost than when a large portion of the face surface is formed by the porous face portion. Can be provided.

(3) Since the porous sintered metal face portion can be made to have a high density by shot peening and the sharp edge state of the edge portion can be maintained even after long-term use, excellent friction can be obtained. The force can be maintained for a long time. Moreover, since the thickness and density distribution of the surface layer, which is increased in density by the shot speed and time of shot peening, can be controlled, the porous sintered metal face of the same material can be subjected to different impact strengths such as iron, pitching wedge, approach wedge, It can be used for sand wedges and the like.

(4) A groove is formed in the porous sintered metal face portion, and when a golf ball is hit at the edge of the groove, irregularities follow the ball surface and the friction property increases. Therefore, the friction property is greatly improved, and a large backspin can be applied very easily.

[Brief description of the drawings]

FIG. 1 is an embodiment of the present invention.

FIG. 2 is an external view of an embodiment of the present invention.

FIG. 3 is an explanatory view of a manufacturing process of a porous sintered metal face portion.

FIG. 4 is an explanatory diagram of a powder state in a manufacturing process of a porous sintered metal face portion.

FIG. 5 is a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron head 2 Iron face 3 Porous sintered metal face part 4 Adhesive layer 5 Groove 6 Golf ball 7 Shaft 8 Water drop 9 Free part 10 Mold 11 Mold part 12 Upper punch 13 Lower punch 14 Powder material

Claims (4)

[Claims] 1. A golf iron club wherein a porous sintered metal face portion made of a porous sintered metal material is provided on a face of a head portion of the golf iron club. 2. A head according to claim 1, wherein said porous sintered metal face is provided on a part of a face of a head.
The golf iron club as described. 3. The golf iron club according to claim 1, wherein the porous sintered metal face portion is formed by performing a finishing process after performing a shot peening. 4. The golf iron club according to claim 1, wherein a groove is formed in the porous sintered metal face portion.