JP6116180B2 - Manufacturing method and golf club head - Google Patents

Description

  The present invention relates to a golf club head.

  Generally, a plurality of linear grooves parallel to each other in the toe-heel direction are formed on the face surface of a golf club head (for example, Patent Documents 1 and 2). This groove is called a score line, a marking line, a face line, etc. (referred to as a score line in this document). The face surface greatly affects the impact performance. Therefore, in order to improve the hit feeling, the spin amount or the flight distance of the hit ball, it has been proposed to configure the golf club head from a plurality of types of materials (for example, Patent Documents 1 to 3).

Japanese Patent Laid-Open No. 10-108927 Japanese Patent Laid-Open No. 7-163688 JP 2001-293115 A

  As a measure for improving the wear resistance of the face surface, it is possible to configure the face surface with a hard material. However, if the face surface is made of a hard material, it may be difficult to process the score line.

  An object of the present invention is to improve both the wear resistance of the face surface and the workability of the score line.

According to the present invention, in the method of manufacturing a golf club head having a face surface in which a plurality of score lines extending in the toe-heel direction are formed in the vertical direction, the face surface includes a face surface forming member and a plurality of scores. A preparation step for preparing a face surface forming member having a plurality of recesses extending in the toe-heel direction, and a step of embedding each of the recesses with a score line forming member for forming the score line. Each score line forming member is a member forming one score line, and among all the score lines, at least a plurality of the score lines continuously arranged in the vertical direction are provided. The score line forming member is formed of a material softer than the face surface forming member. Rana is, the score line includes a pair of side walls, a bottom wall, a sectional shape is trapezoidal, rounded formed at the boundary portion between each side wall and the face of the score line, The score line forming member forms from the middle of the roundness on one side wall side to the middle of the rounding on the other side wall side, and the score line is formed on the score line forming member after the embedding step. The relationship between the angle α between each side wall of the score line and the face surface and the angle β between the side wall of the recess and the face surface is α−β ≧ 10 degrees. Is provided.

Further, according to the present invention, in the golf club head having a face surface in which a plurality of score lines extending in the toe-heel direction are formed in the vertical direction, the face surface includes a face surface forming member and a plurality of score lines. The face surface forming member has a plurality of recesses extending in a toe-heel direction, and each of the recesses is embedded with a score line forming member for forming the score line. The score line forming member is a member that forms one score line, and among all the score lines, at least a plurality of the score lines arranged continuously in the vertical direction are formed by the score line forming member. the score line forming member, Ri Do a material softer than the face surface forming member, said score line comprises a pair A side wall and a bottom wall, the cross-sectional shape of which is trapezoidal, and a round portion is formed at a boundary portion between each side wall of the score line and the face surface, and the score line forming member has one side wall From the middle of the roundness on the side to the middle of the roundness on the other side wall, and an angle α between each side wall of the score line and the face surface, and the side wall of the recess and the face surface There is provided a golf club head characterized in that the relationship between the angle β and the angle β is α−β ≧ 10 degrees .

  According to the present invention, it is possible to improve both the wear resistance of the face surface and the workability of the score line.

1 is a perspective view of a golf club head according to an embodiment of the present invention. Sectional drawing of a face surface. Explanatory drawing of the cutting process by NC milling machine. Explanatory drawing of the manufacturing method of the golf club head of FIG. Explanatory drawing of the manufacturing method of the golf club head of FIG. Explanatory drawing of another example. The exploded perspective view of another example. Explanatory drawing of the manufacturing method of the example of FIG. (A) And (B) is sectional drawing of another example.

<First Embodiment>
FIG. 1 is a perspective view of a golf club head 1 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a face surface (striking surface) 10. In the drawing, the arrow d1 indicates the toe-heel direction, the arrow d2 indicates a direction (vertical direction) orthogonal to the d1 direction, and FIG. 2 is a cross-sectional view of the face surface 10 along the d2 direction.

  In this embodiment, an example in which the present invention is applied to an iron-type golf club head is shown. The present invention is suitable for an iron type golf club head, particularly a middle iron, a short iron, and a wedge type golf club head. Specifically, the loft angle is 30 degrees or more and 70 degrees or less, and the head weight is 240 g or more. Suitable for golf club heads of 320 g or less. However, the present invention can also be applied to wood type or utility type (hybrid type) golf club heads.

  The golf club head 1 is composed of a plurality of types of members. In the case of this embodiment, if it divides roughly, it will be comprised from two types of members. That is, the golf club head 1 includes a main body member 2 and a plurality of score line forming members 3. The main body member 2 forms the face surface 10 and the hosel part 11 and constitutes a part other than the score line forming member 3. The main body member 2 is a face surface forming member in that the face surface 10 is formed. A shaft (not shown) is inserted into the hosel portion 11. In the present embodiment, the main body member 2 has a single member configuration, but may be separated into two or more members. For example, the main body member 2 may be composed of two members: a member including the face surface 10 and a member constituting the remaining portion.

  The face surface 10 has a plurality of recesses 2a. Each recess 2a extends in the d1 direction, and is arranged in the d2 direction in parallel with each other. The score line forming member 3 is a member that fills the recess 2a and is fixed to the recess 2a.

  In the case of this embodiment, the cross-sectional shape of the recess 2a is a square, and the cross-sectional shape of the score line forming member 3 is also a square according to the cross-sectional shape of the recess 2a. Of course, these cross-sectional shapes may be other than a square shape.

  A plurality of score lines 20 a and 20 b are formed on the face surface 10. In the case of this embodiment, the score line 20 a is formed on the main body member 2, and the score line 20 b is formed on the score line forming member 3. Although FIG. 2 shows the cross-sectional shape of only the score line 20b, the score line 20a also has the same cross-sectional shape.

  Each score line 20a, 20b is a linear groove extending in the toe-heel direction (d1 direction) and parallel to each other. In the present embodiment, the arrangement intervals (pitch) of the score lines 20a and 20b are equal intervals (equal pitch), but the arrangement intervals may be different. In the present embodiment, the cross-sectional shapes of the score lines 20a and 20b are the same except for both end portions in the longitudinal direction (toe side end portions and heel side end portions). Moreover, the cross-sectional shape of each score line 20a, 20b is the same.

  The score lines 20a and 20b have a pair of side walls 21 and a bottom wall 22, and the cross-sectional shape is formed in a trapezoidal shape that is symmetrical with respect to the center line CL. Note that the cross-sectional shape of the score line 20 is not limited to a trapezoidal shape, and may be other shapes such as a V shape. The edge 23 serving as a boundary portion between the side wall 21 and the face surface 10 is rounded. The radius of roundness is, for example, not less than 0.05 mm and not more than 0.3 mm. In FIG. 2, a point BP indicates a rounding start point on the face surface 10 side.

  In the case of this embodiment, the score line forming member 3 forms up to a portion outside the pair of start points BP (a part of the face surface 10). That is, the entire roundness of the edge 23 is formed by the score line forming member 3. This facilitates the formation of the score line 20b.

  The depth (the distance between the bottom wall 22 and the face surface 10) D1 of the score lines 20a and 20b is preferably 0.3 mm or more. When the golf club head 1 is used for competition, the depth D1 is 0.5 mm or less in terms of satisfying the rules. The width of the score line 20 (width by the 30-degree measurement method) W1 is preferably 0.6 mm or more. When the golf club head 1 is used for competition, the width W1 is set to 0.9 mm or less in terms of satisfying the rules.

  The concave portion 2a has a depth (distance between the face surface 10 and the deepest portion) D2. In terms of facilitating the formation of the score line 20, the depth d2 is preferably 1.2 times or more the depth d1. The angle α between the side wall 21 of the score line 20 and the face surface 10, the side wall of the recess 2a, and the face are prevented in that the score line forming member 3 is prevented from peeling from the main body member 2 when the score line 20b is formed. The relationship between the angle β and the surface is preferably α−β ≧ 10 degrees.

  The main body member 2 and the score line forming member 3 are formed from different materials. The score line forming member 3 is made of a material softer than the main body member 2. Thereby, the workability of the score line 20 b can be improved by the score line forming member 3 while the wear resistance of the face surface 10 is improved by the main body member 2.

  Examples of the material of the main body member 2 include soft iron, maraging steel, stainless steel, titanium alloy, ceramics, or tungsten alloy. Examples of the score line forming member 3 include soft iron, stainless steel, aluminum alloy, copper alloy, resin, glass, and carbon. The score line forming member 3 may also be a metal putty such as an epoxy resin containing metal powder.

  The score line may not be formed directly on the main body member 2 but all the score lines may be formed by the score line forming member 3. However, when the number of score line forming members 3 increases, the number of man-hours increases, and the production efficiency may worsen on the contrary. Therefore, in the present embodiment, the score line 20 a is formed directly on the main body member 2 without using the score line forming member 3 in a partial region (upper part) of the face surface 10. When manufacturing the main body member 2 by casting, it is preferable that the score line 20a is integrally molded at the time of casting.

  The score line forming member 3 preferably has a smaller area in terms of wear resistance. For this reason, one score line forming member 3 forms one score line 20b. Thereby, the width | variety of the d2 direction of the score line formation member 3 can be narrowed, the area can be made small and abrasion resistance can be improved. In the case where the score line forming member 3 is configured to form a part of the roundness of the edge 23 as described above, this contributes to reducing the width of the score line forming member 3 in the d2 direction. In other words, it is preferable that at least a flat region (a portion excluding the roundness of the score line 20 and its edge 23) of the face surface 10 is formed by the main body member 2.

  In the case of a configuration in which not all score lines are formed by the score line forming member 3 as in the case of the present embodiment, at least a plurality of score lines 20 continuously arranged in the d2 direction are formed by the score line forming member 3. . This suppresses that the hit feeling and the spin amount greatly differ depending on the hit points. However, the entire score line 20b formed by the score line forming member 3 does not have to be continuously arranged in the d2 direction, and is formed directly on the main body member 2 without using the score line forming member 3 in the middle. A score line 20 may be included.

  Next, a method for manufacturing the golf club head 1, particularly a method for forming the recess 2a and the score lines 20a and 20b will be described. The recess 2a and the score line 20a can be formed by, for example, forging, casting, cutting, or laser processing. The score line 20b can be formed by, for example, cutting or laser processing.

  Here, the case where both the recess 2a and the score lines 20a and 20b are formed by cutting will be described with reference to FIGS. FIG. 3 is an explanatory view when cutting is performed by an NC milling machine. FIG. 4 is an explanatory view of the method of manufacturing the golf club head 1 and is a cross-sectional view along the d2 direction of the main body member 1 and the score line forming member 3 in each step. FIG. 5 shows an overall view of the golf club head 1 during manufacture.

  First, the main body member 1 in which the recess 2a and the score line 20a are not formed and the score line forming member 3 in which the score line 20b is not formed are created. Next, the main body member 1 is fixed to an NC milling machine via a jig 101 as shown in FIG. The NC milling machine has a spindle 102 that is driven to rotate about the Z axis, and a cutting tool (end mill) 103 is attached to the lower end of the spindle 102. As the cutting tool 103, a tool suitable for forming the recess 2a and the score lines 20a and 20b is selectively mounted.

  First, the recess 2a is formed. Specifically, in the NC milling machine, after setting the plane coordinates of the face surface 10, the spindle 102 is driven to rotate, and the face surface 10 or the cutting tool 103 is moved relatively in the toe-heel direction (d1 direction). Then, the face surface 10 is cut. When one recess 2a is formed, the cutting tool 103 is moved away from the face surface 10, and then the cutting tool 103 is relatively moved in the arrangement direction (d2 direction) of the recesses 2a to form the next recess 2a. In this way, a plurality of recesses 2a are sequentially formed. A state ST1 in FIGS. 4 and 5 shows a state in which the concave portion 2a is formed on the face surface 10. FIG. Thus, the main body member 2 having a plurality of recesses 2a is prepared (preparation step).

  Next, as shown in the state ST2 of FIGS. 4 and 5, the score line forming member 3 is buried and fixed in the respective recesses 2a (embedding step). At this stage, the score line 20b is not formed on the score line forming member 3. Examples of the fixing method include adhesion, welding, brazing, and caulking. Further, the score line forming member 3 may be dissolved to be liquid and injected into the recess 2a to be solidified. Further, as the score line forming member 3, even when the raw material is a liquid material such as a metal putty, the present agent mixed with metal powder and the curing agent can be mixed and injected into the recess 2a to be solidified. . When performing this fixing step, the main body member 2 may be once removed from the NC milling machine.

  Although the score lines 20a and 20b are formed after the embedding process, there may be undulations on the edge of the score line forming member 3 as shown in the state ST2. Therefore, the undulation may be removed by performing a process of smoothing the face surface 10 before the score line forming process. A state ST3 in FIG. 4 shows a state where undulations are removed. The smoothing of the face surface 10 includes cutting the entire face surface 10 thinly with a cutting tool 103 having a relatively large diameter. Further, the smoothing of the face surface 10 may be performed by polishing other than cutting.

  Next, the process moves to a process of forming score lines, and score lines 20a and 20b are formed. The score line 20 a is formed on the main body member 2, and the score line 20 b is formed on the score line forming member 3. A state ST4 in FIG. 4 shows a state in which the score line 20b is formed on the score line forming member 3. The score line 20a is not formed between the recesses 2a.

  The method of forming the score lines 20a and 20b is the same as the method of forming the recess 2a. In other words, the spindle 102 is driven to rotate, and the face surface 10 is cut while the face surface 10 or the cutting tool 103 is moved relatively in the toe-heel direction (d1 direction). When one score line 20a or 20b is formed, after the cutting tool 103 is separated from the face surface 10, the cutting tool 103 is relatively moved in the arrangement direction (d2 direction) of the score lines 20a and 20b, and the next score is obtained. Line 20a or 20b is formed. In this way, score lines 20a and 20b are formed.

Second Embodiment
The recess 2a may be a groove having at least one end opened. In the example of FIG. 6, a recess 2 a ′ instead of the recess 2 a is a groove opened on the toe side of the main body member 2. A score line forming member 3B instead of the score line forming member 3 has a shape corresponding to the concave portion 2a ′ and extends to the toe side of the main body member 2. In the case of this configuration, the score line forming member 3B can be assembled by being inserted into the recess 2a ′ from the toe side of the main body member 2. For this reason, the choice of the cross-sectional shape of score line formation member 3B and recessed part 2a 'increases from the said embodiment.

<Third Embodiment>
In the first embodiment, after the score line forming member 3 is embedded in the recess 2a, the score line 20b is formed in the score line forming member 3. However, the score line forming member 3 in which the score line 20b has already been formed is connected to the recess 2a. It may be embedded in Examples thereof will be described below. Note that this embodiment can be combined with the second embodiment.

  FIG. 7 is an exploded perspective view of the golf club head 1 of the present embodiment. The same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 7, the present embodiment is different from the first embodiment in that the score line forming member 3 in which the score line 20b has been formed is embedded in the recess 2a.

  Next, the method of forming the recess 2a and the score lines 20a and 20b in the present embodiment is basically the same as in the first embodiment. The score line 20b can be formed in advance on the score line forming member 3 by, for example, forging, casting, cutting, or laser processing.

As in the first embodiment, a case where the recess 2a and the score line 20a are formed by cutting will be described with reference to FIG . First, the main body member 1 in which the concave portion 2a and the score line 20a are not formed and the score line forming member 3 in which the score line 20b has been formed are created.

  Next, a plurality of recesses 2a are formed in the main body member 1 by an NC milling machine (state ST11 in FIG. 8). Thereby, the main body member 2 having a plurality of recesses 2a is prepared (preparation step). Subsequently, the score line 20a is formed.

  The score line 20b is already formed on the score line forming member 3. Therefore, the score line forming member 3 is embedded in each of the recesses 2a (embedding process), whereby the formation of the score line 20b is completed. A state ST12 in FIG. 8 shows a state in which the score line forming member 3 is fixed to the recess 2a. Examples of the fixing method include adhesion, welding, brazing, and caulking. When performing this fixing operation, the main body member 2 may be once removed from the NC milling machine.

  There may be undulations P on the edge of the score line forming member 3. Therefore, the undulations P may be removed by performing a process of smoothing the face surface 10 after the score line forming process. A state ST13 in FIG. 8 shows a state in which the undulations P are removed. The smoothing of the face surface 10 includes cutting the entire face surface 10 thinly with a cutting tool having a relatively large diameter. Further, the smoothing of the face surface 10 may be performed by polishing other than cutting.

<Fourth embodiment>
In each of the embodiments described above, a part of the face surface 10 is also formed by the score line forming member 3, but a configuration in which the face surface 10 is not formed can also be employed. In the example of FIG. 9A, the range from the rounding start point BP of one edge 23 to the rounding start point BP of the other edge 23 is formed. Also in this case, the entire roundness of the edge 23 is formed by the score line forming member 3.

  In addition, it is not necessary to form all the roundness of the edge 23 with the score line forming member 3, and the score line forming member 3 only needs to form at least a part of the roundness of the edge 23. In the case where the score line forming member 3 is configured to form a part of the roundness of the edge 23, the remaining part is formed by the main body member 2, but the processing amount is small, and the rounding of the edge 23 is formed. There are no major difficulties.

  FIG. 9B shows an example. In the example shown in the figure, the score line forming member 3 forms a part from the middle part of one edge 23 of the score line 20b to the middle part of the other edge 23.

Claims (9)

In the method of manufacturing a golf club head comprising a face surface in which a plurality of score lines extending in the toe-heel direction are formed in the vertical direction,
The face surface is composed of a face surface forming member and a plurality of score line forming members,
Preparing a face surface forming member having a plurality of recesses extending in the toe-heel direction;
And embedding each of the recesses with a score line forming member that forms the score line, and
Each of the score line forming members is a member that forms one score line,
Of all the score lines, at least a plurality of the score lines arranged continuously in the vertical direction are formed by the score line forming member,
The score line forming member, Ri Do a material softer than the face surface forming member,
The score line has a pair of side walls and a bottom wall, and its cross-sectional shape is trapezoidal,
Roundness is formed at the boundary between each side wall of the score line and the face surface,
The score line forming member forms from the middle of the roundness on one side wall side to the middle of the roundness on the other side wall side,
The score line is formed on the score line forming member after the embedding step,
The relationship between the angle α between each side wall of the score line and the face surface, and the angle β between the side wall of the recess and the face surface,
α-β ≧ 10 degrees,
The manufacturing method characterized by the above-mentioned. The manufacturing method according to claim 1 , further comprising a step of smoothing the face surface after the embedding step and before forming the score line. At least one of the recess and the score line formed on the score line forming member is formed by cutting.
The manufacturing method of Claim 1 characterized by the above-mentioned. The depth of the concave portion is 1.2 times or more the depth of the score line,
The manufacturing method of Claim 1 characterized by the above-mentioned. The radius of the roundness is 0.05 mm or more and 0.3 mm or less,
The manufacturing method of Claim 1 characterized by the above-mentioned. The recess is a groove opened on the toe side,
The manufacturing method of Claim 1 characterized by the above-mentioned. In the golf club head having a face surface in which a plurality of score lines extending in the toe-heel direction are formed in the vertical direction,
The face surface is composed of a face surface forming member and a plurality of score line forming members,
The face surface forming member has a plurality of recesses extending in the toe-heel direction,
A score line forming member for forming the score line is embedded in each of the recesses,
Each of the score line forming members is a member that forms one score line,
Of all the score lines, at least a plurality of the score lines arranged continuously in the vertical direction are formed by the score line forming member,
The score line forming member, Ri Do a material softer than the face surface forming member,
The score line has a pair of side walls and a bottom wall, and its cross-sectional shape is trapezoidal,
Roundness is formed at the boundary between each side wall of the score line and the face surface,
The score line forming member forms from the middle of the roundness on one side wall side to the middle of the roundness on the other side wall side,
The relationship between the angle α between each side wall of the score line and the face surface, and the angle β between the side wall of the recess and the face surface,
α-β ≧ 10 degrees,
A golf club head characterized by that. The radius of the roundness is 0.05 mm or more and 0.3 mm or less,
The golf club head according to claim 7 . The recess is a groove opened on the toe side,
The golf club head according to claim 7 .

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