JP2959753B2 - Putter head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a putter head for a golf club.

[0002]

2. Description of the Related Art Various materials such as stainless steel, soft iron, brass, brass and aluminum are used as materials for a putter head, and various shapes such as L-shaped, T-shaped, mallet-shaped and pin-shaped are used. It is. In recent years, many balls use a cover (for example, Surlyn or the like) that is harder and more scratch-resistant than a balata cover whose ball skin is easily damaged, and a two-piece ball is used more often than a wound ball. Therefore, a two-piece ball or the like having a hard skin has a harder feeling of putting than a thread-wound balata ball, and is not preferable in putting where a delicate touch is required. Therefore, a material has been developed in which a putter head is made of aluminum or an alloy thereof so that a soft shot feeling can be obtained even when a two-piece ball or the like is used.

[0003]

The putter head made of aluminum or an alloy thereof has a low specific gravity, so that even if it is attempted to putt in a pendulum type, the weight of the head cannot be utilized well and the putter head is hit with a moderate force. And tended to be hand-ruffed instead of shoulder rotation. Further, it was not satisfactory in terms of vibration damping after impact.

Accordingly, the present invention uses a light and soft magnesium-based alloy as well as aluminum or its alloy as a material to prevent scratching, not to impair the smoothness of the face surface, and to sense the weight of the head for smoothness. It is an object of the present invention to provide a putter head having a soft stroke, a soft feel of impact, and an excellent vibration damping property.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a head body entirely formed of a magnesium-based alloy, wherein a weight member is disposed on a heel side and a toe side to clean the surface. 0.2-0.4 mol / l of dichromate, 7-15 ml of nitric acid (60%)
/ L, a primary phosphate of 0.5 to 0.7 mol / l, and a protective film formed on the surface by immersion in a treatment solution having a composition of 10 to 20 g / l of selenous acid.

[0006]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a plan view showing a preferred embodiment of the present invention, in which a weight member 2 is disposed on a heel side and a toe side of a head body 1 entirely formed of a lightweight magnesium-based alloy. . Magnesium-based alloys have better vibration damping properties than aluminum or its alloys. A shaft insertion hole 3 is formed on the heel side. The putter head having such a shape is a so-called mallet type, using a magnesium-based alloy intact and arranging the weight member 2 so that the total head weight is about 200 to 500 g, preferably about 300 to 400 g. It is to become. The weight of only the head body 1 made of a magnesium-based alloy is 100 to 250 g, preferably about 150 g.

FIG. 2 shows a side view of FIG.
Are formed smoothly.

FIG. 3 is a front view as viewed from the face surface 4 side, and clearly shows the positional relationship between the shaft insertion hole 3 and the pair of weight members 2. As the weight member 2, a tungsten alloy having a specific gravity of about 17 to 20 is used. Such a weight member 2
Is arranged, the moment of inertia about the vertical axis of the head is increased, and as a result, the head is excellent in directionality. For disposing the weight member 2 on the head main body 1, an embedding hole is formed in the head main body 1 in advance, and the weight member 2 is embedded in this hole.

It is preferable that an insulating layer made of epoxy resin or the like is provided between the head body 1 and the weight member 2. Thereby, corrosion of the head can be favorably prevented.

The surface of the head body 1 is cleaned by blasting or the like, and then 0.2 to 0.4 mol / l of dichromate, 7 to 15 ml / l of nitric acid (60%), and first phosphate are used. 0.5-0.7 mol / l, selenous acid 10-20 g / l
To form a protective film on the surface. A more preferred composition of the treatment liquid is as follows. Sodium dichromate 65-80 g / l Nitric acid (60%) 7-15 ml / l Sodium monophosphate 65-80 g / l Selenous acid 10-20 g / l After immersion, wash with water, dry and protect the surface of the alloy A film was formed. As a more preferred treatment condition, it is immersed in a treatment solution heated to 80 to 90 ° C. for 2 to 8 minutes.

As a comparative example, "A"
After subjecting an alloy called “Z92” to pretreatment such as blasting, a hydrofluoric acid (46%) 248 at a liquid temperature of 20 to 30 ° C.
immersed for 30 seconds to 5 minutes in water / ml / l
5 g in 50 g / l of sodium acid fluoride (or potassium acid fluoride or ammonium acid fluoride) at 0-30 ° C.
Soak for 2 minutes and wash with water, sodium dichromate 120 ~
A treatment solution of 130 g / l and 50 g / l of calcium fluoride (or magnesium fluoride) was immersed in boiling water for 30 minutes, washed with water, and finally immersed in warm water and dried to be subjected to anticorrosion treatment. The corrosion resistance of the golf club head provided with the protective film of the above-described example and the golf club head of the comparative example were compared. As a result of reproducing and observing the scratches created by the actual contact of the golf club head with the ground, the comparative example remains exposed when the magnesium-based alloy is exposed, but in the example, when the magnesium-based alloy is exposed, the magnesium and selenium are exposed. A local battery was formed in between, and selenium oxide was deposited, whereby a protective film was formed again on the surface of the magnesium-based alloy.

Further, the test pieces prepared from the above comparative examples and examples were used as test specimens, and the corrosion resistance was determined by the salt spray test method of JIS Z2371. Test duration is 120
Time. In the comparative example, white corrosion products were scattered, but hardly observed in the examples. Further, the weight after the test was reduced in the comparative example, and no change was observed in the examples. The weight loss is due to material loss due to corrosion.

In the case of coating after applying a protective film as a corrosion-resistant treatment on the surface, the electrodeposition coating has a strong coating film and is hardly damaged. It goes without saying that painting may be performed by other painting methods used for golf club heads. Further, as the paint, an epoxy-based or urethane-based paint is suitable.

By performing a heat treatment after manufacturing the head main body 1 by a lost wax method or the like, for example, by performing a heat treatment represented by T5 and T6 in JIS standard symbols, the tensile strength and hardness are increased. Here, "T5" is to stabilize by removing artificial aging and casting strain.
"T6" is an artificial aging after solution treatment, and the solution treatment temperature differs depending on the type of alloy, but at least 38%.
0 ° C, maximum 500 ° C. The artificial aging temperature also varies depending on the type of alloy, but is at least 170 ° and at most 2
60 ° C. "AZ92" as a magnesium-based alloy
When the alloy was used, the tensile strength (Kg / mm ² ) of “T6” was “27” for “180” compared to “180” of the heat treatment “T5”.
5 ", the Prinell hardness was" 84 "for" 80 ", and the 0.2% proof stress was" 145 "for" 117 ".

Here, a magnesium-based alloy refers to an alloy having a magnesium content exceeding 50%. Besides magnesium, Al, Zn, Mn, Zr, Si, Cu, Ni
Etc. may be included. Magnesium-based alloys that can be suitably used include MC2 in JIS symbol.
And MC3 can be suitably used.

Three types of putter heads having the structures shown in FIGS. 1 to 3 were produced, and steel shafts were attached. Example 1: Head body Magnesium alloy of MC2 in JIS symbol Comparative example 1: Head body 6Al-4V Ti alloy Comparative example 2: Head body Stainless steel For each of these heads, the same size impact was applied to the face center. The vibration state at the lowermost end of the shaft at that time was examined. The results are shown in FIGS. These graphs (FIGS. 4 to 6) show waveforms obtained by removing the waveform of the impact impact by a filter. Figures 4-6
As can be seen from the figure, the amplitude of the vibration is very small in the putter of the first embodiment.

Although the present invention has been described in detail with reference to the accompanying drawings, the present invention is not limited thereto, and various modifications can be made. For example, the portion where the weight member 2 is disposed on the head body 1 made of a magnesium-based alloy is shown in FIGS.
9 can be changed.

[0019]

As described above, according to the present invention, the weight members are arranged on the heel side and the toe side of the head body entirely formed of a magnesium-based alloy, and the protective film is formed on the surface of the head body. As a result, the surface is hardly damaged and the corrosion resistance is improved while maintaining the softness of the feel. Therefore, the smoothness of the face is not impaired. In addition, the vibration damping property was also improved. In addition, since the weight member is provided, a certain weight is added to the head body,
Smooth stroke is possible. Further, the arrangement of these weight members increases the moment of inertia and improves the directionality. Furthermore, since the head body is lightweight and a weight member is added, the degree of freedom in design is increased.

[Brief description of the drawings]

FIG. 1 is a plan view showing a preferred embodiment of the present invention.

FIG. 2 is a side view.

FIG. 3 is a front view.

FIG. 4 is a graph showing a vibration state of the first embodiment.

FIG. 5 is a graph showing a vibration state of Comparative Example 1.

FIG. 6 is a graph showing a vibration state of Comparative Example 2.

FIG. 7 is a sectional view showing another embodiment.

FIG. 8 is a sectional view showing still another embodiment.

FIG. 9 is a sectional view showing another embodiment.

[Explanation of symbols]

 1 Head body 2 Weight member

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-336083 (JP, A) JP-A-4-332572 (JP, A) JP-A-6-80453 (JP, U) (58) Survey Field (Int.Cl. ⁶ , DB name) A63B 53/04 C23C 22/33 C23C 22/57

Claims (1)

(57) [Claims] 1. A weight member is disposed on a heel side and a toe side of a head body entirely formed of a magnesium-based alloy, and the surface-cleaned magnesium-based alloy is dichromated from 0.2 to 0.4. Mol / l, nitric acid (60%) 7-15 ml /
1, a putter head having a protective film formed on a surface thereof by immersion in a treatment solution having a composition of 0.5 to 0.7 mol / l of a first phosphate and 10 to 20 g / l of selenous acid. .