JP2019005774A - Manufacturing method - Google Patents

Abstract

To further evenly deburr on a face part.SOLUTION: A method for manufacturing a golf club head including a face part includes: a groove formation step of forming a plurality of grooves in the face part; and a removing step of removing burrs generated in each edge of the grooves by the groove formation step, with laser blast.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a technique for manufacturing a golf club head.

  Techniques for modifying the surface of the face part and forming grooves by irradiating the face part with laser or colliding with a sphere are known (Patent Documents 1 to 5).

US Patent Application Publication No. 2002/0091014 JP 2004-142343 A US Pat. No. 8,608,590 Japanese Patent No. 3919867 JP 2011-056099 A

  When grooves are formed in the face portion, burrs may remain on the edges of the grooves. As a method of removing burrs, sand blasting that hits a metal ball or sand to the face part is conventionally used. However, it is not always easy to make sand or the like collide with the entire face part, and variations may occur. . If the undulations on the surface of the face portion vary, it becomes a factor that causes variations in the hit ball depending on the hit points at the time of hitting.

  An object of the present invention is to more uniformly remove burrs on the face portion.

According to the present invention,
A method of manufacturing a golf club head including a face part,
A groove forming step of forming a plurality of grooves in the face portion;
Removing the burrs generated at the respective edges of the plurality of grooves by laser blasting by the groove forming step,
The manufacturing method characterized by this is provided.

  According to the present invention, burrs on the face portion can be more uniformly removed.

1 is an external view of a golf club head according to an embodiment of the present invention. Sectional drawing of a score line and a narrow groove. (A)-(C) are figures which show the example of a manufacturing method. (A)-(C) are figures which show the example of a manufacturing method. (A) And (B) is a figure which shows another example of a manufacturing method. The figure which shows another example of a manufacturing method.

  FIG. 1 is an external view of a golf club head A according to an embodiment of the present invention. The example in the figure shows an example in which the present invention is applied to an iron type golf club head. The present invention is suitable for manufacturing an iron-type golf club head, in particular, a middle iron, a short iron, and a wedge-type golf club head. Specifically, it is suitable for manufacturing a golf club head having a loft angle of 30 degrees or more and 70 degrees or less and a head weight of 240 g or more and 320 g or less. However, the present invention can also be applied to the manufacture of wood type or utility type (hybrid type) golf club heads.

  The golf club head A includes a face portion 1 and a hosel portion 5. The face portion 1 forms a striking surface for striking a golf ball. A shaft (not shown) is attached to the hosel portion 5. In FIG. 1, an arrow d2 indicates a toe-heel direction, T indicates a toe side, and H indicates a heel side. An arrow d1 indicates a direction perpendicular to the toe-heel direction and along the striking surface. U indicates the upper side when the sole portion of the head A is grounded, and L indicates the lower side when the sole portion of the head A is grounded.

  A plurality of grooves 2 and a plurality of grooves 3 are formed in the face portion 1. The plurality of grooves 2 are score lines, and may be referred to as score lines 2 hereinafter. The plurality of grooves 3 are thinner than the score line 2, and may be hereinafter referred to as narrow grooves 3. The score line 2 and the narrow groove 3 will be described with reference to FIG. FIG. 2 is a partial cross-sectional view of the face portion 1 in the d1 direction, and shows a cross-sectional view between score lines 2 adjacent in the d1 direction.

  The plurality of score lines 2 are arranged in the d1 direction in parallel with each other. Each score line 2 is a linear groove extending in the d2 direction. In the present embodiment, the arrangement intervals (pitch) of the score lines 2 are equal intervals (equal pitch), but the arrangement intervals may be different. In this embodiment, the cross-sectional shape of the score line 2 is the same except for both ends in the longitudinal direction (toe side end, heel side end). Each score line 2 has the same cross-sectional shape.

  The score line 2 has a pair of side walls (side portions) 21 and a bottom wall (bottom portion) 22, and the cross-sectional shape is formed in a trapezoidal shape that is symmetrical with respect to the center line in the d1 direction. Note that the cross-sectional shape of the score line 2 is not limited to a trapezoidal shape, and may be other shapes such as a V shape. The edge 23 of the score line 2 is rounded. The radius of roundness is, for example, not less than 0.05 mm and not more than 0.3 mm.

  The depth of the score line 2 (the distance between the bottom wall 22 and the surface of the face portion 1) Ds is preferably 0.3 mm or more. When the golf club head A is used for competition, the depth Ds is 0.5 mm or less in terms of satisfying the rules. The width of the score line 2 (width by the 30-degree measurement method) Ws is preferably 0.6 mm or more. When the golf club head A is used for competition, the width Ws is set to 0.9 mm or less in terms of satisfying the rules.

  The plurality of narrow grooves 3 are grooves whose width Wg is narrower than the width Ws of the score line 2. The width Wg is, for example, not less than 30 μm and not more than 700 μm. The depth Dg of the narrow groove 3 is preferably 10 μm or more from the viewpoint of drainage. When the golf club head 1 is used for competition, the depth Dg is 25 μm or less in terms of satisfying the rules. In the present embodiment, the cross-sectional shape of the cut surface in the d1 direction of the narrow groove 3 is a rectangle. However, other cross-sectional shapes such as a triangular shape or an arc shape may be used.

  In the case of this embodiment, the narrow groove 3 is formed in a linear shape, and in particular, formed in a linear shape, but may be a curved line. Each narrow groove 3 has a single linear shape, but may be interrupted in the middle. In the case of this embodiment, the narrow groove 3 is parallel to the score line 2, but may be extended in the intersecting direction. However, when the length is parallel, the length of the narrow groove 3 can be increased, and the water on the face portion 1 can be drained over a wide range in the toe-heel direction. In the case of the present embodiment, the narrow grooves 3 are formed at an equal pitch in a region between adjacent score lines 2. This reduces variations in the backspin amount depending on the position of the hit point on the face portion 1.

  Next, a method for manufacturing the golf club head A will be described. For example, the golf club head A manufactures a primary molded product without the narrow groove 3 by forging or casting. Next, the narrow groove 3 is formed in the primary molded product. Thereafter, painting and surface treatment are performed to complete the golf club head A. The primary molded product may be formed with the score line 2 or may not be formed. When the score line 2 is not present in the primary molded product, the score line 2 can also be formed when the narrow groove 3 is formed. The primary molded product may be a single member or a plurality of members. In the case of using a plurality of members, for example, a primary molded product may be constituted by a face forming member that forms the face portion 1 and a head body that forms a portion other than the face portion 1. In this case, the face forming member and the head body may be assembled after the narrow groove 3 is formed in the face forming member.

  Next, a method for forming the narrow groove 3 will be described. The narrow groove 3 can be formed by laser processing or cutting. 3A and 3B illustrate the case where the narrow groove 3 is formed by laser processing.

  The primary molded product A ′ in which the narrow groove 3 is not formed is fixed to a laser irradiation apparatus (not shown) via the jig 100. The laser irradiation apparatus includes a laser beam irradiation unit 101 and a mechanism for moving the irradiation unit 101 or a mechanism for moving the jig 100. Then, while irradiating the face part 1 with laser light from the irradiation part 101, the face part 1 (primary molded product A ′) or the irradiation part 101 is moved relatively in the d2 direction to form the narrow groove 3. When forming the single narrow groove 3, the relative movement in the d2 direction between the face part 1 and the irradiation part 101 may be performed once or a plurality of times. In the case of multiple relative movements, the irradiation position may be slightly shifted in the d1 direction. Depending on the form of the narrow groove 3 (for example, when the width Wg is wide), a plurality of relative movements may be essential.

  When one narrow groove 3 is formed, the face portion 1 or the irradiation portion 101 is relatively moved in the d1 direction so that the irradiation position of the laser beam is aligned with the position of the next narrow groove 3 (during this time, the irradiation of the laser beam is performed). Stop.). Then, while irradiating the face portion 1 with laser light from the irradiating portion 101, the face portion 1 or the irradiating portion 101 is relatively moved in the d2 direction to form the next narrow groove 3. Thereafter, the narrow groove 3 is sequentially formed by repeating the same procedure.

  FIG. 3C illustrates the case where the narrow groove 3 is formed by cutting. The primary molded product A ′ is fixed to the NC milling machine via the jig 100. 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. Similarly to the case of laser processing, the face portion 1 (primary molded product A ′) or the cutting tool 103 is moved relatively in the d2 direction to form the narrow groove 3. When one narrow groove 3 is formed, after the cutting tool 103 is lifted from the face part 1, the face part 1 or the irradiation part 101 is moved relatively in the d1 direction to change the cutting position to the position of the next fine groove 3. To match. Then, the cutting tool 103 is lowered again to the face portion 1, and the face portion 1 or the irradiation portion 101 is moved relatively in the d2 direction to form the next narrow groove 3. Thereafter, the narrow groove 3 is sequentially formed by repeating the same procedure.

  In addition, when the primary molded product A ′ does not have the score line 2, the score line 2 is also formed by the same processing (laser processing or cutting processing) as the formation of the fine groove 3 when the fine groove 3 is formed. Also good.

  Next, removal of burrs caused by the formation of the narrow grooves 3 will be described. In both laser processing and cutting, burrs are generated at each edge of the narrow groove 3. In this embodiment, this burr is removed by laser blasting. Sand blasting is known as a method for removing burrs. However, sand blasting cannot precisely control a site where a medium such as sand collides. For this reason, it is necessary to partially mask the face portion 1 so that the medium does not collide with a portion where it is not desired to collide, and the surface condition such as the accuracy of burr removal and the glossiness may be biased. On the other hand, in laser blasting, it is easy to control the irradiation position and intensity of laser light, and the burrs at the target site on the face portion 1 can be removed more uniformly and without excess or deficiency. Masking is also unnecessary. It is known that sandblasting that physically destroys a metal surface is likely to cause rust on the metal surface by exposing the metal surface after processing. When the burrs are removed by laser blasting, an oxide film is formed on the metal surface by the heat, so that rust is hardly generated.

  4A to 4C show examples of removing burrs from each edge of the narrow groove 3. In the example of the figure, an example is shown in which the narrow grooves 3 are formed by laser processing, and subsequently, burrs are removed by laser blasting. When burrs are removed using a laser irradiation apparatus different from the laser irradiation apparatus used to form the narrow grooves 3, there may be a case where it is necessary to consider a shift in coordinates due to a difference in the shape of the irradiation unit 101. Further, when it is necessary to replace the jig for fixing the head A ′, it may be necessary to consider a case where a deviation occurs in the relative position between the jig 100 and the head A ′. In addition, when it is necessary to replace the jig, in addition to aligning the relative positions of the jig 100 and the head A ′, it is necessary to perform a process alignment process, which requires man-hours. As in the example of FIGS. 4A to 4C, the same laser irradiation apparatus is used for the formation of the narrow groove 3 and the removal of the burrs, so that the positional accuracy of the processed part can be improved and the jig can be used. Since the work can be continuously performed without removing the primary molded product A ′ from the laser irradiation apparatus 100 and the laser irradiation apparatus, work efficiency can be improved.

  FIG. 4A shows the cross-sectional shape of the primary molded product A ′ in which the narrow groove 3 is not formed. In this example, the score line 2 is already formed on the primary molded product A ′. FIG. 4B shows a stage in which the narrow groove 3 is formed by irradiating the face portion 1 with laser light 101a from the irradiation portion 101. FIG. The details of this stage are as described with reference to FIGS. 3 (A) and 3 (B). Due to the formation of the narrow grooves 3, burrs 4 are generated at the edges thereof. The burr 4 is a linear protrusion extending so as to surround the periphery of the narrow groove 3. The burrs 4 are linearly formed on both sides in the d1 direction with respect to one narrow groove 3, and are also generated at the H-side end and the T-side end, which are not shown, which are the ends in the d2 direction of the narrow groove 3.

  FIG. 4C shows a configuration in which the burrs 4 are removed by laser blasting. The procedure for removing the burrs 4 is basically the same as the laser processing of the narrow grooves 3. While the laser beam 101b is irradiated by the irradiation unit 101 to the position of the burr 4, the face unit 1 (primary molded product A ′) or the irradiation unit 101 is moved relatively in the d2 direction to remove the burr 4. When removing one burr 4, the relative movement in the d2 direction between the face part 1 and the irradiation part 101 may be performed once or a plurality of times. In the case of multiple relative movements, the irradiation position may be slightly shifted in the d1 direction. Depending on the distance between two adjacent burrs 4, these can be removed simultaneously. In the example of FIG. 4B, an example in which two adjacent burrs 4 are removed simultaneously is illustrated.

  When one or two adjacent burrs 4 are removed, the face part 1 or the irradiation part 101 is moved relatively in the d1 direction so that the irradiation position of the laser light 101b is aligned with the position of the next burr 4 (during this time, the laser The light irradiation may be stopped, or burrs on the H side end and the T side end in the d2 direction of the narrow groove 3 may be removed.) Then, while the face unit 1 is irradiated with the laser beam 101b by the irradiation unit 101, the next burr 4 is removed by relatively moving the face unit 1 or the irradiation unit 101 in the d2 direction. Thereafter, the burrs 4 can be sequentially removed by repeating the same procedure. In this way, the laser beam 101b is irradiated to the face portion 1 a plurality of times in a linear manner at intervals in the d1 direction, so that the laser beam 101b is prevented from being irradiated to portions other than the burr 4 while the 4 can be removed.

  The output of the irradiation unit 101 may be changed between the laser beam 101a when forming the narrow groove 3 and the laser beam 101b when removing the burr 4. Usually, the outputs of the laser beam 101b and the laser beam 101c are made lower than the laser beam 101a. As a result, the narrow groove 3 can be efficiently formed, and a situation in which the surface of the face portion 1 is unnecessarily removed during laser blasting can be avoided.

  The irradiation conditions of the laser beams 101b and 101c in laser blasting can be appropriately set according to the specifications of the narrow groove 3, the material of the face portion 1, required accuracy, and processing time. For example, if the material of the face portion 1 is a metal that is not easily affected by heat, a pulse laser having a relatively wide pulse width can be used for processing, but if it is a metal that is easily affected by heat, the effect on the substrate is affected. Use a laser with a small pulse width.

  In forming the narrow grooves 3 and removing the burrs 4, the plurality of narrow grooves 3 may be formed and the burrs 4 may be removed by simultaneously irradiating laser beams from the plurality of irradiation units 101. FIG. 5A and FIG. 5B show an example, and illustrate an example in which a plurality of burrs 4 are removed simultaneously.

  FIG. 5A shows an example in which the laser beam 101b is irradiated from the two irradiation units 101A and 101B, and the burrs 4 on both sides of the narrow groove 3 are simultaneously removed. The two irradiation units 101A and 101B are arranged side by side in the d1 direction. In the case of a mechanism example in which the face unit 1 side is fixed and the irradiation unit 101 side is moved, the two irradiation units 101A and 101B are moved together.

  FIG. 5B also shows an example in which the laser light 101b is irradiated from the two irradiation units 101A and 101B. Compared with the example of FIG. 5A, the two irradiation parts 101A and 101B are separated in the d1 direction, and the burr 4 at the edge of one narrow groove 3 of the two adjacent narrow grooves 3 and the other narrow groove. 3 shows an example in which the burr 4 at the edge 3 is removed simultaneously. This is suitable when the arrangement pitch of the narrow grooves 3 is narrower than the arrangement pitch of the irradiation parts 101A and 101B.

  In removing the burr 4, only the burr 4 may be selectively irradiated with laser light, or the entire face portion 1 may be irradiated with laser light exhaustively to remove the burr 4 and the face portion. The antireflection processing 1 may be performed simultaneously.

  FIG. 6 shows an example in which after the narrow groove 3 is formed, the face portion 1 is irradiated with laser light exhaustively, and the burr 4 is removed and the antireflection processing of the face portion 1 is performed. In addition to removing fine burrs by irradiating the face part 1 entirely with a pulse laser to make the surface part 1 irradiate the face part 1 in the same manner as the conventional sandblasting method in which medium particles collide with the face part. The reflection of the surface of the part 1 can be suppressed. By using a pulse laser controlled by a program, the surface state of the face portion 1 can be made more uniform and precise than sand blast, which cannot finely control medium particle collision.

  In any of the examples of FIGS. 5A, 5B, and 6, the removal efficiency of the burr 4 can be improved. In the example of FIGS. 5A and 5B, two irradiation units 101 are used, but three or more irradiation units may be used. The arrangement pitch in the d1 direction of the plurality of irradiation units 101 may be, for example, a pitch in the range of 10 μm to 100 μm.

  Even when the score line 2 is formed by laser processing or cutting, burrs may occur. Also in this case, the burr may be removed by laser blasting in the same manner as the burr 4 is removed.

  Note that after the formation of the narrow groove 3 and the removal of the burr 4, it is preferable to perform a surface treatment for increasing the hardness of the face portion 1. Examples of such surface treatment include carburizing treatment, nitriding treatment, soft nitriding treatment, PVD (Physical Vapor Deposition) treatment, ion plating, DLC (diamond-like carbon) treatment, and plating treatment. In particular, surface treatment that modifies the surface without forming another metal layer on the surface, such as carburizing treatment or nitriding treatment, is preferable.

A Golf club head, 1 face, 2 score lines, 3 narrow grooves

Claims (7)

A method of manufacturing a golf club head including a face part,
A groove forming step of forming a plurality of grooves in the face portion;
Removing the burrs generated at the respective edges of the plurality of grooves by laser blasting by the groove forming step,
The manufacturing method characterized by the above-mentioned. The manufacturing method according to claim 1,
In the groove forming step, the groove is formed by laser processing.
The manufacturing method characterized by the above-mentioned. It is a manufacturing method of Claim 2, Comprising:
In the removing step, the laser irradiation device used in the groove forming step is used, and the laser blasting is performed by changing the output of the laser irradiation device with the groove forming step.
The manufacturing method characterized by the above-mentioned. The manufacturing method according to claim 1,
A fixing step of fixing a member forming the face portion to a jig;
The groove forming step and the removing step are performed after the fixing step, and the groove forming step and the removing step are performed while the member is fixed to the jig.
The manufacturing method characterized by the above-mentioned. The manufacturing method according to claim 1,
Set the laser irradiation conditions of the laser blast according to the specifications of the groove and the material of the face part,
The manufacturing method characterized by the above-mentioned. The manufacturing method according to claim 1,
The groove is a linear groove;
In the removing step, the burr is removed by irradiating the face portion with a laser beam a plurality of times at intervals.
The manufacturing method characterized by the above-mentioned. The manufacturing method according to claim 1,
In the removing step, a plurality of burrs are simultaneously removed by simultaneously irradiating laser beams from a plurality of laser irradiation units.
The manufacturing method characterized by the above-mentioned.

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