JP6202822B2 - Golf club head and manufacturing method - 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

  When the face surface is made of a hard material, the wear resistance is improved, but the processability and feel of the score line may be lowered. On the other hand, when the face surface is made of a soft material, the workability and feel of the score line are improved, but the wear resistance is lowered, the periphery of the score line is worn, and the spin amount of the hit ball is reduced. Therefore, it is conceivable to take measures to construct the face surface from a plurality of materials having different hardnesses. However, since an impact load acts on the face surface every time it is struck, it is necessary to prevent material peeling and chipping. .

  An object of the present invention is to prevent material peeling and chipping when a face surface is made of a plurality of materials having different hardnesses.

According to the present invention, in the golf club head including 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 at least one score line. At least one score line forming member, wherein the face surface forming member and the score line forming member are made of different materials, and the face surface forming member includes the score line forming member. A recessed portion that is embedded, and the recessed portion extends in a toe-heel direction, and at least one of an upper side and a lower side of the recessed portion enters a back side of the face surface formed by the face surface forming member. part have a bottom wall of the recess is not parallel to the face surface, the golf club heads, characterized in that There is provided.

According to the present invention, in the manufacturing method of 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 at least one of a face surface forming member and one of forming the score lines, and a least one score line forming member, toe - a preparation step of forming before Symbol face forming member recesses extending heel direction, the recess in the score line forming member An embedding step, and the face surface forming member and the score line forming member are made of different materials, and the concave portion is formed on at least one of the upper side and the lower side of the face surface forming member. have a intruded gouging portion on the back side of the face formed by the members, in the preparation step, the recess is formed Normal direction of the face surface with respect to the rotation axis of the cutting tool is set to the face surface forming member so as to be inclined to the vertical direction that, to form the recess, the manufacturing method characterized by Provided.

  According to the present invention, when the face surface is composed of a plurality of materials having different hardnesses, it is possible to prevent the material from being peeled off or broken.

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

<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 present embodiment, the face surface 10 is a flat surface. In the figure, the arrow d1 indicates the toe-heel direction. An 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. Needless to say, the vertical direction indicated by the arrow d2 is based on the vertical relationship when the golf club head 1 is solesed. An arrow d3 indicates the front and back direction of the face surface 10, and is the normal direction of the face surface 10.

  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.

  A plurality of recesses 200 are formed on the face surface 10. The respective recesses 200 extend in the d1 direction, and are arranged in the d2 direction in parallel with each other. The score line forming member 3 is a member that densely fills the concave portion 200 and is fixed to the concave portion 200.

  In the present embodiment, the recess 200 has a square cross-sectional shape having a bottom wall 201 and a pair of side walls 202 parallel to each other, except for both ends in the d1 direction. The bottom wall 201 is not parallel to the face surface 10, and the recess 200 has a rectangular cross-sectional shape formed obliquely with respect to the face surface 10.

  The cross-sectional shape of the score line forming member 3 also has a shape that matches the cross-sectional shape of the recess 200. Of course, these cross-sectional shapes may be other than a square shape.

  The concave portion 200 has an undercut portion 203 that enters the back side of the face surface 10 formed by the main body member 2 on the upper side thereof. A line L is an imaginary line orthogonal to the face surface 10 and indicates an edge of the face surface 10 with respect to the recess 200. The punching portion 203 is a region on the left side of the line L when viewed in FIG.

  Of the pair of side walls 202 of the recess 200, the upper side wall 202 defines the bore portion 31 together with a part of the bottom wall 201. A wedge-shaped corner is formed by the upper side wall 202 and the face surface, and the angle α is less than 90 degrees. The angle α is preferably 30 degrees or greater and 80 degrees or less.

  The score line forming member 3 has a portion 31 that fills the punched portion 203. The presence of the portion 31 makes it difficult for the score line forming member 3 to come out of the recess 200 in the normal direction of the face surface 10. Therefore, the score line forming member 3 can be prevented from peeling off or missing.

  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. In addition, the cross-sectional shape of the score line 20 is not limited to a trapezoidal shape, and may be another shape 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 may contribute to facilitating 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.

  In terms of facilitating the formation of the score line 20b, the minimum thickness t between the bottom wall 201 of the recess 200 and the bottom wall 22 of the score line 20b is preferably 0.2 mm or more.

  The main body member 2 and the score line forming member 3 are formed of materials having different hardnesses. For example, the score line forming member 3 is made of a material softer than the main body member 2. In this case, 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. Conversely, the score line forming member 3 is made of a material harder than the main body member 2. In this case, the wear resistance around the score line 20 b can be improved by the score line forming member 3 while improving the hit feeling by the main body member 2.

  Examples of the material of the main body member 2 and the score line forming member 3 include soft iron, maraging steel, stainless steel, aluminum alloy, copper alloy, titanium alloy, ceramics, tungsten 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. Further, only one score line may be formed by the score line forming member 3.

  If the number of score line forming members 3 increases, the number of man-hours increases, and the production efficiency may deteriorate. 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.

  In the case of this embodiment, one score line forming member 3 forms one score line 20b. Thereby, the width of the score line forming member 3 in the d2 direction can be reduced, which is advantageous when it is desired to reduce the area of the score line forming member 3. In other words, it is advantageous when it is desired to form at least a flat region (a portion excluding the roundness of the score line 20 and its edge 23) of the face surface 10 with the main body member 2.

  For example, when the score line forming member 3 is made of a softer material than the main body member 2, it is preferable that the area thereof is small in terms of wear resistance, and therefore, the configuration of this embodiment is preferable. For example, when the score line forming member 3 is made of a material harder than the main body member 2, it is preferable that the area is small in terms of improving the hit feeling, and therefore, the configuration of the present embodiment is preferable.

  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. It is preferable. This suppresses that the hit feeling and the spin amount greatly differ depending on the hit points. However, even in this case, it is not necessary that all the score lines 20b formed by the score line forming member 3 are continuously arranged in the d2 direction, and the main body without using the score line forming member 3 in the middle. A score line 20 formed directly on the member 2 may be included.

  Next, a method for manufacturing the golf club head 1, particularly a method for forming the recess 200 and the score lines 20 a and 20 b will be described. The recess 200 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 200 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 concave portion 200 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 200 and the score lines 20a and 20b is selectively mounted.

  First, the recess 200 is formed. When forming the recess 200, as shown in FIG. 3B, the main body member 1 is set so that the normal direction of the face surface 10 is inclined with respect to the Z axis according to the shape of the recess 200.

  In the NC milling machine, the spindle 102 is driven to rotate, and the face surface 10 or the cutting tool 103 is relatively moved in the toe-heel direction (d1 direction) to cut the face surface 10.

  When one recess 200 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 of the recesses 200 (d2 direction) to form the next recess 200. Thus, a plurality of recesses 200 are sequentially formed. A state ST1 in FIGS. 4 and 5 shows a state in which the concave portion 200 is formed on the face surface 10. Thus, the main body member 2 having a plurality of recesses 200 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 200 (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 200 to be solidified. Further, even when the raw material is a liquid material such as a metal putty as the score line forming member 3, the present agent mixed with metal powder and the curing agent can be mixed and injected into the recess 200 to be solidified. . When performing this fixing step, the main body member 2 may be once removed from the NC milling machine.

  After the embedding process, score lines 20a and 20b are formed. Therefore, the main body member 1 is set so that the normal direction of the face surface 10 is parallel to the Z axis. As shown in the state ST2, there may be undulations on the edge of the score line forming member 3. 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. In the present embodiment, the score line 20 a is not formed between the recesses 200.

  The method of forming the score lines 20a and 20b is the same as the method of forming the recess 200. 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
In the above embodiment, one score line 20b is formed on one score line forming member 3, but a plurality of score lines 20b may be formed. In the example of FIG. 6A, two score lines 20 b are formed on a score line forming member 3 </ b> A instead of the score line forming member 3. A concave portion 200A instead of the concave portion 200 is also formed in a shape in which the score line forming member 3A is embedded. In the case of this configuration, since the total number of score line forming members 3A is reduced, the number of parts of the golf club head 1 can be reduced.

<Third Embodiment>
The recess 200 may be a groove having at least one end opened. In the example of FIG. 6B, a recess 200 </ b> B replacing the recess 200 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 200B 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 200B from the toe side of the main body member 2. For this reason, the choice of the cross-sectional shape of the score line formation member 3B and the recessed part 200B increases from the said embodiment.

<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. 7A, a 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 the example of the figure, the score line forming member 3 does not form the face surface 10 on both the upper side and the lower side of the score line 20b, but the score line forming member 3 does not form the face surface 10 only on the upper side. The score line forming member 3 may be configured not to form the face surface 10 for at least one of the upper side and the lower side such as the configuration.

  Next, it is not necessary to form the entire roundness of the edge 23 with the scoreline forming member 3, and the scoreline 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. 7B 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. In the example of the figure, the score line forming member 3 is configured not to form all of the roundness of the edge 23 for both the upper side and the lower side of the score line 20b. The score line forming member 3 does not form all of the roundness of the edge 23, at least one of the roundness of the upper and lower edge 23, such as a configuration in which the score line forming member 3 does not form the whole. You may make it form.

<Fifth Embodiment>
In the first embodiment, the counterbore 203 is formed on the upper side of the recess 200, but may be formed on the lower side. However, of the edge 23 of the score line 20b, the upper edge 23 is more likely to be loaded in that it spins the golf ball when hit. Therefore, the score line forming member 3 can be more effectively prevented from peeling or missing by forming the punched portion 203 at least above the concave portion 200.

  The counterbore 203 may be formed on both the upper and lower sides of the recess 200. FIG. 8 shows an example. In the example of the figure, it is assumed that the concave portion 200 </ b> C is formed by an NC milling machine, and the broken lines L <b> 1 and L <b> 2 indicate the positions of the cutting tool 103 during cutting. In the case of this example, the recess 200C is formed by changing the direction of the cutting tool 103 relative to the face surface 10 and cutting twice. A scoreline forming member 3C instead of the scoreline forming member 3 has a cross-sectional shape corresponding to the cross-sectional shape of the recess 200C, and has portions 31 that respectively fill the two punched portions 203.

<Sixth Embodiment>
In the first embodiment, after the score line forming member 3 is embedded in the recess 200, 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 been formed is replaced with the recess 200. It may be embedded in Examples thereof will be described below.

  FIG. 9 is an exploded perspective view of the golf club head 1 of the present embodiment, and 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. 9, the present embodiment is different from the first embodiment in that the score line forming member 3 in which the score line 20 b has been formed is embedded in the recess 200.

  Next, the method for forming the recess 200 and the score lines 20a and 20b in the present embodiment is basically the same as that 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, the case where the concave portion 200 and the score line 20a are formed by cutting will be described with reference to FIG. 10. First, the main body member 1 in which the concave portion 200 and the score line 20a are not formed, and the score line The score line forming member 3 in which 20b is formed is created.

  Next, a plurality of recesses 200 are formed in the main body member 1 by an NC milling machine (state ST11 in FIG. 10). Thereby, the main body member 2 having a plurality of recesses 200 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 200 (embedding step), thereby completing the formation of the score line 20b. A state ST12 in FIG. 10 shows a state in which the score line forming member 3 is fixed to the recess 200. 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. 10 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.

<Other embodiments>
Although a plurality of types of embodiments of the present invention have been described above, the embodiments can be combined with each other.

Claims (11)

In 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 is
A face surface forming member;
And at least one score line forming member forming at least one of the score lines,
The face surface forming member and the score line forming member are materials having different hardnesses,
The face surface forming member has a recess in which the score line forming member is embedded,
The recess, toe - extend in the heel direction, in either its upper and lower at least, gouging unit have a that has entered the rear side of the face formed by the face member,
The bottom wall of the recess is not parallel to the face surface;
A golf club head characterized by that. Roundness is formed at the boundary between each side wall of the score line and the face surface,
The score line forming member forms at least a part of the roundness;
The golf club head according to claim 1. Roundness is formed at the boundary between each side wall of the score line and the face surface,
The score line forming member is:
Starting from the middle of the rounding on at least one of the side walls,
The golf club head according to claim 1. The one side wall is an upper side wall of the score line;
The golf club head according to claim 3. The recess is
At least on the upper side thereof,
The golf club head according to claim 1. The score line forming member is a softer material than the face surface forming member.
The golf club head according to claim 1. The score line forming member is a material harder than the face surface forming member.
The golf club head according to claim 1. The recess is
On both the upper side and the lower side, each has the above-mentioned punched portion,
The golf club head according to claim 1. One score line forming member forms one score line;
The recess is
The have a bottom wall and a pair of side walls, the upper and lower direction of the cross-sectional shape is square,
One of the previous SL pair of side walls defines the gouging unit,
It said one said face and the angle of the corner portion formed by the one of the pair of side walls is less than 90 degrees,
The golf club head according to claim 1. 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 comprises a face surface forming member and at least one score line forming member forming at least one score line;
Toe - a preparation step of forming before Symbol face forming member recesses extending heel direction,
Burying the recess with the score line forming member, and
The face surface forming member and the score line forming member are materials having different hardnesses,
The recess, in either its upper and lower at least, gouging unit have a that has entered the rear side of the face formed by the face member,
In the preparation step, the face surface forming member is set so that a normal direction of the face surface is inclined in the vertical direction with respect to a rotation axis direction of a cutting tool for forming the recess, thereby forming the recess. ,
The manufacturing method characterized by the above-mentioned. It is a manufacturing method of Claim 10, Comprising:
In the preparation step, by changing the orientation of the cutting tool in the direction of the rotation axis and cutting the face surface forming member twice, the concave portions having the punched portions on the upper side and the lower side are formed, respectively.
The manufacturing method characterized by the above-mentioned .

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