JP6044129B2 - Manufacturing method of golf club head - Google Patents

Description

The present invention relates to a hollow golf club head, and more specifically, a golf club head manufacturing method in which at least a part is made of a metal plate part, and a thin part, a thick part, and a middle part are provided on the metal plate part. It is about.

  Hollow metal golf club heads such as drivers and fairway woods are widely used. In general, a hollow wood-type golf club head includes a face portion for hitting a ball, a crown portion constituting the upper surface portion of the golf club head, a sole portion constituting the bottom surface portion of the golf club head, and a golf club. It has a side part constituting a side part on the toe side, back side and heel side of the head, and a hosel part. A shaft is inserted into the hosel part and fixed with an adhesive or the like.

  As a metal constituting the hollow golf club head, an aluminum alloy, stainless steel, or titanium alloy is used, but in recent years, a titanium alloy is particularly widely used.

  Patent Document 1 paragraphs 0027 to 0033 include a golf club head in which the central portion of the crown portion is a thin portion and the periphery thereof is a thick portion, and the thin portion is formed by casting and chemical milling. Is described. In this golf club head, parts other than the face part are integrally formed by casting, and at this time, an outwardly bulging part is formed in the crown part. After casting, the protruding portion of the bulging portion is removed by chemical milling to form a thin portion.

JP 2009-153802 A

  In the said patent document 1, only the thin part and the thick part are provided in the crown part. In such a structure, since the level difference between the thin portion and the thick portion is large, when the ball is hit, stress tends to concentrate on the boundary portion between the thin portion and the thick portion.

  In Patent Document 1, it is conceivable to form a middle portion between the thin portion and the thick portion, but in this case, a cavity shape having a step portion for forming the middle portion as a casting mold. However, every time the width or thickness of the inner wall portion is changed, it is necessary to use a different shape as the mold, which increases the cost of the mold.

  An object of the present invention is to make it possible to easily manufacture a golf club head having a thin portion, a thick portion, and a middle portion on a metal plate portion at a low cost.

The golf club head manufacturing method of the present invention has a metal plate portion, the metal plate portion is provided with a thin wall portion and a thick wall portion, and an intermediate portion between the thin wall portion and the thick wall portion. the method of manufacturing a hollow golf club head having medium thickness portion of the thickness is provided, the thin-walled portion and the middle thickness portions, the metal plate portion by pressing a recess on one surface of the metal plate portion is characterized in that the formation forming a humps on the other side, a step of chemical milling recess and the periphery thereof, by removing by polishing convex plants and forming .

  In the golf club head of the present invention, the metal plate portion is provided with a thick portion and a thin portion, and further, a middle portion is provided at the boundary between them. For this reason, the stress at the time of ball hit is widely dispersed compared to a golf club head consisting of only a thick part and a thin part.

  Since this inner portion is formed by chemical milling, there is no need for a step portion for forming the inner portion in the press mold, and the metal plate portion having various shapes of the inner portion is formed into one press die. The manufacturing cost of the golf club head can be reduced.

1 is a perspective view of a golf club head according to an embodiment. It is the II-II sectional view taken on the line of FIG. It is sectional drawing which shows the manufacturing method of a crown part. (A) The figure is a perspective view of the golf club head concerning another embodiment, (b) A figure is a BB line sectional view of (a) figure.

  Hereinafter, embodiments will be described with reference to the drawings.

  The golf club head 1 is a hollow driver head and includes a face portion 2, a crown portion 3, a sole portion 4, a side portion 5, and a hosel portion 6. This golf club head is made of a titanium alloy.

  In the golf club head 1, for example, a crown portion and other portions (head main body) are manufactured separately, and both are integrated by welding such as laser welding or plasma welding. The crown portion and the face portion may be integrated and welded to other head main bodies. The crown portion and the face portion may be separate from each other and welded to other head bodies.

  The head main body is a cast product and can be easily manufactured even if it has a complicated shape. However, the head body may be a forged product.

  The central portion of the crown portion 3 is a thin portion 3a, the periphery thereof is a middle portion 3b, and the periphery thereof is a thick portion 3c. The area of the thin portion 3a is preferably about 30 to 90%, particularly about 60 to 80% with respect to the area of the crown portion. The width of the middle thickness portion 3b (average width in the direction from the thin thickness portion 3a to the thick thickness portion 3c) is preferably about 5 to 25 mm, particularly about 10 to 15 mm.

  The thickness of the thick part 3c is preferably about 0.6 to 1.2 mm, particularly about 0.7 to 0.9 mm. The thickness of the thin portion 3a is preferably about 30 to 70% of the thick portion 3c, particularly about 40 to 60%, and the thickness of the middle portion 3b is preferably about 50 to 90%, particularly about 60 to 80% of the thick portion 3c. .

  In order to manufacture the crown portion 3, as shown in FIG. 3A, a plate made of titanium or a titanium alloy is pressed to form a base plate 3A. The base plate 3A is curved in the shape of a crown portion, and a recess 3r is provided on the inner surface side of the golf club head, and a protrusion 3t is provided on the outer surface side. The base plate 3A has a uniform thickness as a whole. Masking is performed on the region M of the inner surface side of the base plate 3A excluding the recess 3r and its peripheral portion. A paint such as an acrylic resin is suitable as the masking material. Thereafter, the inner surface side of the base plate 3A is chemically milled with an etching solution for titanium such as a mixed acid of hydrofluoric acid and nitric acid. At this time, it is preferable that the entire outer surface of the base plate 3A is masked, and the base plate 3A is immersed in an etching solution to chemically etch the recess 3r and its surroundings. Thereby, the base plate 3B shown in FIG.3 (b) is obtained. This base plate 3B has a thin portion 3a, a middle portion 3b, and a thick portion 3c. By removing the convex portion 3t of the base plate 3B by polishing and removing the masking material, the crown portion shape shown in FIGS.

  The golf club head 1 configured as described above has a thin central portion of the crown portion 3 and is easily bent when a ball is hit. The launch angle of the ball is increased and the repulsive force is improved. The distance can be increased.

  Since the golf club head 1 is provided with the middle thickness portion 3b between the thin portion 3a and the thick portion 3c, the stress at the time of ball hit is dispersed. Thereby, durability improvement of a golf club head can be aimed at. Further, the hit feeling and the hitting sound can be modified.

  The crown portion of the golf club head 1 is manufactured by pressing and chemical milling as shown in FIG. 3, and the depth of the thin portion 3a and the middle portion 3b is changed by changing the masking region and chemical milling conditions. In addition, the width of the inner meat portion 3b can be variously changed. Therefore, these depths and widths can be variously changed, and crown parts of various specifications can be manufactured at a low cost using a common press mold.

  A golf club head 1 'according to another embodiment will be described with reference to FIGS.

  In the golf club head 1 ′, a plurality of thin portions 3 d extending in the front-rear direction are provided on the crown portion 3 ′. The thin portions 3d are provided at intervals in the toe / heel direction. Middle wall portions 3e are provided on both sides (toe side and heel side) of the thin portion 3d. Other configurations are the same as those of the golf club head 1, and the same reference numerals indicate the same parts.

  Similarly to FIG. 3, the crown portion 3 ′ of the golf club head 1 ′ is formed by pressing a titanium or titanium alloy plate into a base plate with a recess and a convex, It is manufactured by polishing and removing the place.

  In the golf club head 1 ′ shown in FIGS. 4 and 5, the thin portion 3 d and the middle portion 3 e extend in the front-rear direction, but may extend in the toe-heel direction.

  In the above embodiment, the thin part, the middle part, and the thick part are formed on the crown part, but the thin part, middle part, and thick part are the same on the side part, the heel part, and the face part. You may form by the method of.

DESCRIPTION OF SYMBOLS 1,1 'Golf club head 2 Face part 3 Crown part 3a, 3d Thin part 3b, 3e Medium part 3c Thick part 3r Concave part 3t Convex part 4 Sole part 5 Side part 6 Hosel part

Claims (5)

It has a metal plate part, a thin part and a thick part are provided on the metal plate part, and a middle part with a thickness between the thin part and the thick part is provided at the boundary part between the thin part and the thick part. In the method of manufacturing a hollow golf club head ,
The thin-walled portion and the middle thickness portions, forming a humps on the other surface to form a recess on one surface of the metal plate portion of the metal plate portion by pressing,
Chemical milling the recess and its surroundings;
Method of manufacturing a golf club head, characterized in that formed by removing by polishing the convex plants. 2. The golf club head manufacturing method according to claim 1, wherein the metal plate portion is a crown portion,
The method of manufacturing a golf club head , wherein the recess is formed on an inner surface side of the golf club head. The method of manufacturing a golf club head according to claim 1 or 2, the manufacturing method of the golf club head, wherein the middle thickness portion along the periphery of the thin portion is provided. In the manufacturing method of the golf club head according to claim 2 or 3,
The thin portion is provided in the central portion of the crown portion so as to occupy 30 to 90% of the area of the crown portion,
The width of the middle portion is 5 to 25 mm, the thickness of the thin portion is 30 to 70% of the thickness of the thick portion, and the thickness of the middle portion is 50 to 90 of the thickness of the thick portion. %. A method for manufacturing a golf club head , comprising: 5. The method of manufacturing a golf club head according to claim 1, wherein the inner portion is formed by a step of chemically milling the recess and the periphery thereof.
The method of manufacturing a golf club head, wherein the thin portion is formed by a step of chemically milling the recess and the periphery thereof and a step of polishing and removing the protrusion.

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