Golf club head and method of manufacturing the golf club head

Abstract

To provide a golf club head in which local stress concentration is unlikely to occur in a clad material and the impact characteristics of the head can be improved. [Solution] This golf club head S100 comprises a head body 10 having a face portion 11, a crown portion 12 and a sole portion 13, at least a portion of the sole portion 13 being made of a clad material 20, the clad material 20 having a laminated structure of a first layer 21 which is a first metal material and a second layer 22 which is a second metal material different from the first metal material, the second layer 22 being arranged to face the inside of the head body 10, and in a cross-sectional view in the thickness direction of the clad material 20, the end face 22a of the peripheral portion of the second layer 22 includes an inclined portion which is inclined in a positive taper direction at an angle of 30° to 85° relative to the direction of the fold line L2 on the surface of the first layer.

Description

[Technical Field]

[0001] The present invention relates to a golf club head and a method for manufacturing a golf club head. [Background technology]

[0002] BACKGROUND ART Conventionally, golf club heads in which a part of the sole is formed from a clad material are known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-000598 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional configurations are based on the premise that a predetermined layer constituting the clad material is cut, and then the remaining layers are bent in the thickness direction. Although not anticipated in the configuration of Patent Document 1, the following problem occurs when a cut predetermined layer is laminated on a flat or gently curved clad material layer. Specifically, when the end face of the predetermined layer is cut perpendicularly, the thickness of the clad material changes suddenly at the end face, causing problems such as stress concentration and an inability to obtain the desired deformation characteristics of the clad material as a whole, resulting in a deterioration in the impact characteristics of the head.

[0005] Therefore, the present invention has been made in consideration of the above points, and aims to provide a golf club head and a method for manufacturing a golf club head that are less likely to cause local stress concentration in the clad material and can improve the impact characteristics of the head. [Means for solving the problem]

[0006] A golf club head according to one embodiment of the present invention is a golf club head comprising a head body having a face portion, a crown portion, and a sole portion, wherein at least a portion of the sole portion is made of a clad material, and the clad material has a laminated structure in which a first layer made of a first metal material and a second layer made of a second metal material different from the first metal material are laminated together, the second layer being arranged to face the inside of the head body, and in a cross-sectional view in the thickness direction of the clad material, the end face of the peripheral portion of the second layer includes an inclined portion inclined in a positive taper direction at an angle of 30° to 85° relative to the fold line direction of the surface of the first layer.

[0007] The second metallic material may have a higher specific gravity than the first metallic material.

[0008] In a cross-sectional view of the clad material in the thickness direction, the first layer may have a curved cross-sectional shape, and the radius of curvature of the curved cross-sectional shape may be 50 mm or more.

[0009] The inclined portion may be formed above a rising portion that rises from the surface of the first layer, with the rising portion remaining as the peripheral wall of the first layer.

[0010] The first layer may be pure titanium or a titanium alloy, and the second layer may be stainless steel.

[0011] The first layer may be fixed to the head body by welding an end surface of the first layer to an end surface of a member of the head body.

[0012] One embodiment of the present invention provides a method for manufacturing a golf club head, which includes a head body having a face portion, a crown portion, and a sole portion, and includes the steps of: preparing a clad material in which a first layer made of a first metal material and a second layer made of a second metal material different from the first metal material are laminated; and cutting the second layer while leaving some of the material that constitutes the second layer. In the step of cutting the second layer, the end face of the peripheral portion of the second layer is cut so that, when viewed in a cross section in the thickness direction of the clad material, the end face of the second layer includes an inclined portion that is inclined in a positive taper direction at an angle of 30° to 85° relative to the fold line direction of the surface of the first layer.

[0013] In the step of cutting the end surface of the second layer, the end surface may be cut by milling using a rotating tool. [Effects of the Invention]

[0014] The present invention has the effect of providing a golf club head and a method of manufacturing a golf club head that are less likely to cause localized stress concentration in the clad material and that can improve the impact characteristics of the head. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a front view of the golf club head. [Figure 2] FIG. 2 is a bottom view of the golf club head. [Figure 3] 3 is a cross-sectional view taken along the line AA in FIG. 2 in the up-down direction. [Figure 4] FIG. 2 is a plan view of the clad material as seen from the second layer side. [Figure 5] FIG. 2 is a diagram showing the cross-sectional shape of a clad material. [Figure 6] 10A and 10B are diagrams showing examples of cross-sectional shapes of other clad materials. [Figure 7] 1A to 1C are diagrams for explaining a method for manufacturing a golf club head. [Figure 8] FIG. 10 is a diagram showing a cross-sectional shape of a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0016] An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a front view of a golf club head. Fig. 2 is a bottom view of the golf club head. Fig. 2(a) shows a state in which a clad material has been attached, and Fig. 2(b) shows a state before the clad material has been attached. Fig. 3 is a vertical cross-sectional view taken along the AA cutting line in Fig. 2.

[0017] Each figure shows the golf club head S100 in a reference state. The "reference state" refers to a state in which the golf club head S100 is placed on a horizontal plane with a lie angle and a loft angle set for the head. In this specification, unless otherwise specified regarding the posture of the head, the golf club head S100 is considered to be in this reference state.

[0018] (Golf club head S100 configuration) The golf club head S100 is a wood-type golf club head, and includes a head body 10 and a neck member 30, as shown in FIG.

[0019] In the golf club head S100 of this embodiment, a clad material 20 (details below) is provided on the head body 10. This clad material 20 has a second layer 22 that is machined, thereby adjusting the center of gravity characteristics and deformation characteristics of the clad material 20 and, ultimately, the center of gravity characteristics and deformation characteristics of the entire golf club head S100. Furthermore, a main feature of the golf club head S100 of this embodiment is that, as will be described later, an end face 22a of the peripheral edge of the second layer 22 is formed so as to be inclined, rather than perpendicular, to a tangent line L2 to the surface of the first layer 21 (see FIG. 5).

[0020] (Head body 10) The head body 10 is hollow and includes a face portion 11, a crown portion 12, a sole portion 13, a side portion 14, and a hosel portion 15, as shown in FIG.

[0021] A shaft (not shown) is connected to the neck member 30. The neck member 30 is, for example, a metal sleeve. The neck member 30 is fixed to the head body 10 by a fixing screw.

[0022] Although the head body 10 in this embodiment has side portions 14, the side portions 14 may not be present depending on the shape of the head body 10. The side portions 14 are not an essential component of the present invention.

[0023] The head body 10 may be made of any material, but one example is a metal material. The head body 10 may be made of pure titanium or a titanium alloy, for example. Pure titanium or a titanium alloy is preferable from the viewpoint of a balance between strength and light weight. A titanium alloy is a material containing 80% or more by mass of titanium. Examples of titanium alloys include α-type alloys, β-type alloys, and α+β-type alloys.

[0024] As an example, the head body 10 is integrally formed from a single material. The head body 10 may also be formed by joining multiple members together. When the clad material 20 is fixed to the head body 10 by a method other than welding, the head body 10 does not necessarily have to be made of a metal material. For example, it may be made of a carbon fiber material such as carbon.

[0025] The face portion 11 is provided on the front surface of the golf club head S100. The face portion 11 is a portion where the face surface that hits the ball is formed.

[0026] The crown portion 12 is a portion that forms the top surface of the golf club head S100. The side portion 14 is a portion that connects the crown portion 12 and the sole portion 13. The side portion 14 extends so as to form the side surface of the head main body 10. The hosel portion 15 is a portion to which the neck member 30 is fixed.

[0027] The sole portion 13 is a portion that forms the lower surface of the golf club head S100. The sole portion 13 is formed in a curved shape and is connected to the side portion 14. As shown in FIG. 2(b), an opening 10h is formed in the sole portion 13.

[0028] A fixing portion 10a is formed on the periphery of the opening 10h. The fixing portion 10a is not an essential component of the present invention. The fixing portion 10a is a portion to which the clad material 20 is fixed. The fixing portion 10a is a part of the head main body 10. The fixing portion 10a is a stepped portion in which the thickness of the member of the head main body 10 is partially thinned. The fixing portion 10a extends along the periphery of the opening 10h. The width of the fixing portion 10a is, for example, 1 mm or more and 5 mm or less.

[0029] (Clad material 20) The clad material 20 is a member in which different metals are laminated together. The clad material 20 may have a laminated structure of three or more layers, but in this example, it has two layers. As shown in Figure 3, the clad material 20 has a first layer 21 and a second layer 22.

[0030] The first layer 21 is a member fixed to the head body 10. The first layer 21 may be made of any material that can form a clad material. The material (first metal material) of the first layer 21 is, for example, an iron-based alloy (e.g., stainless steel), a titanium alloy, pure titanium, an aluminum alloy, pure aluminum, a magnesium alloy, pure magnesium, or a copper alloy. In this example, the first layer 21 is, for example, a titanium alloy or pure titanium. The first layer 21 is, for example, fixed to the head body 10 by welding. The first layer 21 is made of a material that can be welded to the head body 10.

[0031] A fixing portion 21a is formed on the periphery of the first layer 21. The fixing portion 21a is not an essential component of the present invention. The fixing portion 21a has a shape complementary to the fixing portion 10a of the head body 10. The fixing portion 21a is a stepped portion where the thickness of the material of the first layer 21 is partially thinned. The width of the fixing portion 21a is, for example, 1 mm or more and 5 mm or less. As one example, the fixing portion 21a is fixed to the fixing portion 10a of the head body 10 by welding. As a specific example, the first layer 21 may be made of pure titanium or a titanium-based alloy, and the first layer 21 may be welded to the sole portion of the head body 10 made of stainless steel. Fixation may also be by screwing.

[0032] In the present invention, the method for welding the first layer 21 to the head body 10 is not limited to a specific method. The first layer 21 may be welded to the head body 10 by, for example, butt welding. In this case, the fixing portion 10a of the head body 10 and the fixing portion 21a of the first layer 21 may not be formed.

[0033] The second layer 22 is a second metal material different from the first metal material of the first layer 21. The material of the second layer 22 may be any material that can be bonded to the first layer 21 to form a clad material. Examples of the material of the second layer 22 include an iron-based alloy (e.g., stainless steel), a titanium alloy, pure titanium, an aluminum alloy, pure aluminum, a magnesium alloy, pure magnesium, and a copper alloy. The material of the second layer 22 may be a material having a higher specific gravity than the material of the first layer 21, or a material having a lower specific gravity than the material of the first layer 21.

[0034] The material and shape of the second layer 22 affect the position of the center of gravity of the head main body 10. In consideration of this function of the second layer 22, it is preferable that the second layer 22 be made of a material with a higher specific gravity than the material of the first layer 21, for example (for example, the second layer 22 is stainless steel and the first layer is pure titanium or a titanium alloy). This is because a material with a higher specific gravity makes it easier to adjust the position of the center of gravity of the head main body 10. Furthermore, the second layer 22 faces the internal space of the head main body 10 and is therefore less restricted in shape than a member disposed on the outside of the head main body 10, such as the first layer 21. Therefore, using a material with a higher specific gravity for the second layer 22, as in the configuration of this embodiment, is preferable in terms of increasing the degree of freedom in the design of the head main body 10.

[0035] No adhesive or the like is interposed between the first layer 21 and the second layer 22. The first layer 21 and the second layer 22 are directly bonded to each other. The first layer 21 and the second layer 22 are bonded to each other by a method such as rolling or explosive bonding.

[0036] 4 is a plan view of the clad material viewed from the second layer side. The second layer 22 may have any contour shape. The contour shape of the second layer 22 is appropriately designed taking into consideration, for example, the position and characteristics of the center of gravity required for the head body 10 and the material (specific gravity and physical properties) of the second layer 22.

[0037] The second layer 22 is formed by cutting the second layer 22 while leaving a portion of the material that constitutes the second layer 22 (as described in detail below). The second layer 22 is cut in such a manner that the first layer 21 remains in a region that is more peripheral than the second layer 22 in a plan view of the clad material 20, as shown in FIG. 4 . The fixing portion 21a is not shown in FIG. 4 . The length d21 of the shortest portion of the first layer that extends beyond the outline of the second layer 22 (the length when the clad material is viewed from above the head) is preferably 5 mm or more or 10 mm or more, for example. By ensuring such a sufficient length, even if the second layer 22 is made of a material that melts relatively easily, the material of the second layer 22 is less likely to melt or deform when the first layer 21 is welded.

[0038] (Cross-sectional shape of clad material 20) Fig. 5 is a diagram showing the cross-sectional shape of a clad material. Fig. 5 is a cross-sectional view of the clad material in the thickness direction. Fig. 5(a) shows the cross-sectional shape of the sole portion, and Fig. 5(b) is an enlarged view of a portion of Fig. 5(a).

[0039] In this example, the first layer 21 is fixed to the head body 10 by butt welding. Specifically, the first layer 21 is fixed to the head body 10 via a weld formed by welding the boundary between the end face 21t of the first layer 21 and the end face 10t of the head body 10 while the end face 21t faces the end face 10t of the head body 10. In this manner, the configuration in which the first layer 21 is fixed to the head body 10 by welding the end face 21t of the first layer to the end face 10t of the head body member provides the following advantages compared to a configuration in which the connection is made at the fixing portion 21a (FIG. 3).

[0040] Compared to a method of fastening via a stepped portion such as the fixing portion 10a, butt welding as shown in FIG. 5(a) simplifies the cross-sectional shape of the components (eliminating sudden changes in shape), making stress concentration less likely. As a result, the durability of the golf club head is improved and the possibility of breakage at the welded portion is reduced. Furthermore, in a configuration where stepped portions are welded, it may be necessary to form the components thick to create the step. In contrast, with the above configuration, there is no need to form the components thick, and the weight increase due to the presence of thick portions can be avoided. Furthermore, since there is no need to form thick portions, design freedom can be increased (for example, thick portions can affect the weight balance of the golf club head, and the absence of thick portions increases the freedom of center of gravity design).

[0041] As can be seen from Figure 5(a), the first layer 21 has a gently curved cross-sectional shape. The radius of curvature of this curved cross-sectional shape is, for example, 50 mm or more. Because the first layer 21 is a member that flexes and generates a repulsive force when hit with a ball, a relatively simple cross-sectional shape is preferable to a complexly curved shape in order to ensure the repulsive force of the ball.

[0042] The radius of curvature may be measurable based on the central axis in the thickness direction of the first layer 21 in a cross-sectional view. The radius of curvature of the curved cross-sectional shape portion of the first layer 21 being 50 mm or more means that the first layer 21 does not include a portion that bends with a radius of curvature of 10 mm or less, for example.

[0043] FIG. 6 shows an example of the cross-sectional shape of another clad material. For simplicity, only the first layer is shown in FIG. 6. A "complexly curved shape" refers to a cross-sectional shape such as the one shown in FIG. 6. In this example, the clad material includes a portion where the layer abruptly changes in its thickness direction. The clad material in this example is deformed so that a portion of the component is stepped due to plastic deformation caused by shear pressure during press working. When the cross-sectional shape changes abruptly in this way, the component loses flexibility at the bent portion, resulting in a decrease in the resilience of the clad material. Furthermore, when such abrupt cross-sectional shape changes are included, the component's strength at the bent portion decreases, making it more susceptible to breakage.

[0044] A cross-sectional shape is said to change suddenly when, for example, the value of dy / dx is 0.3 or greater. dx is the horizontal (front-to-back) distance between the position where the component begins to bend and the position where it ends to bend. dy is the vertical (height) distance between the center line of the cross section where the component begins to bend and the center line of the cross section where it ends to bend. A value of dy / dx of 0.3 or greater is when, for example, dx is 10 mm and dy is 3 mm.

[0045] The first layer 21 does not have a cross-sectional shape as shown in Fig. 6, but has a cross-sectional shape with a radius of curvature R of 50 mm or more. With this configuration, the resilience characteristics of the clad material 20 are ensured compared to the configuration as shown in Fig. 6, and also, a decrease in the strength of the member at the bending point, which makes it more susceptible to breakage, is prevented.

[0046] (Shape of end surface 22a of second layer 22) The second layer 22 has an end surface 22a as shown in FIG. 5(b). The second layer 22 is disposed so as to face the inside of the head body. The end surface 22a is the surface of the peripheral portion of the second layer 22. In a cross-sectional view, the end surface 22a is a surface that connects the upper surface and the lower surface of the second layer 22. The end surface 22a is provided so as to be inclined with respect to a tangent line L2 to the surface of the first layer 21.

[0047] If the end surface 22a is formed to extend in the normal direction L1, the following problem may arise: In this configuration, the thickness of the clad material 20 changes suddenly at this end surface. This may result in problems such as stress concentration at this part where the thickness suddenly changes, or the clad material as a whole not being able to achieve the desired deformation characteristics, resulting in a deterioration in the impact characteristics of the head.

[0048] Therefore, in this embodiment, the end face 22a is an inclined face. The end face 22a is, for example, an inclined face inclined in a positive taper direction. Specifically, the end face 22a of the peripheral portion of the second layer is inclined in a positive taper direction with respect to the direction of the tangent L2 to the surface of the first layer 21 (which is also the tangent to the lower surface of the second layer 22). The "positive taper direction" is a direction that does not result in a reverse taper, and is a direction that is inclined toward the side where the member of the second layer 22 is present (the left side in the figure) in the left-right direction in FIG. 5(b).

[0049] The inclination angle α of the end face 22a relative to the tangent line L2 is in the range of 30° to 85°. As an example, the inclination angle α may preferably be in the range of 40° to 60°. If the inclination angle α is less than 30°, it is expected that it will be difficult to process the end face 22a to such an angle, and from this perspective, the lower limit of the inclination angle is preferably in the above range.

[0050] The inclination of the end face 22a in this manner results in a gentler change in thickness of the clad material compared to a configuration in which the end face is formed vertically, thereby alleviating stress concentration and improving the deformation characteristics of the clad material as a whole compared to a configuration in which the end face is formed vertically, resulting in improved impact characteristics of the head.

[0051] (Manufacturing method) 7 is a diagram illustrating a method for manufacturing a golf club head. The method for manufacturing a golf club head according to one embodiment of the present invention includes the steps of preparing a clad material, cutting the second layer, pressing the clad material, and fixing the clad material.

[0052] In the step of preparing a clad material, a clad material 20 is prepared as shown in FIG. 7(a). The clad material 20 is the clad material before cutting. In the clad material 20, a first layer 21 and a second layer 22 are stacked and bonded to each other. The contour shape of the first layer 21 and the contour shape of the second layer 22 are the same. The contour shape refers to the contour shape of the clad material 20 in a plan view seen in the thickness direction. One example of the contour shape of the clad material 20 is a rectangle.

[0053] 7(b), in the step of cutting the second layer 22, the second layer 22 is cut while leaving a portion of the material that constitutes the second layer 22. Examples of cutting include lathe processing, processing using a machining center, and milling.

[0054] The second layer 22 may be cut after the contour shape of the quadrangular clad material 20 is processed into a shape corresponding to the opening 10h of the head body 10, or the second layer 22 may be cut before the contour shape of the quadrangular clad material 20 is processed into a shape corresponding to the opening 10h of the head body 10.

[0055] An unnecessary portion of the second layer 22 is cut away, and the end surface 22a is formed, for example, by a rotating tool (an end mill, for example). This configuration in which the end surface 22a is cut and formed by milling has the advantage that the end surface 22a can be easily formed by using an end mill with a tapered shape that corresponds to the inclination of the end surface 22a.

[0056] In the step of pressing the clad material, the clad material 20 is pressed. This pressing is a process for gently bending the entire clad material 20 so that it fits the outer shape of the head body 10. Therefore, this pressing is not a process that will result in a cross-sectional shape such as that shown in FIG.

[0057] 7(c), the pressed clad material 20 is gently bent so that the first layer 21 forms the desired outer shape of the head body 10. In this example, the first layer 21 and the second layer 22 are bent.

[0058] As described above, the clad material 20 is pressed to produce the clad material 20 that is fixed to the opening 10h.

[0059] The fixing portion 21a (see FIG. 3) may be formed in a process before or after the press working.

[0060] In the present invention, only the first layer 21 may be curved without curving the second layer 22. This process is effective when the area where the second layer 22 is formed is relatively small.

[0061] In the process of fixing the clad material 20, the clad material 20 produced as described above is fixed to the head body 10. In the process of fixing the clad material 20, as an example, fixing portion 21a on the periphery of the first layer 21 and fixing portion 10a which is part of the member forming the head body 10 are fixed by welding. As described above, the first layer 21 may be fixed to the head body 10 by butt welding.

[0062] Through the above series of steps, the golf club head S100 in which the clad material 20 is fixed to the sole portion 13 is manufactured.

[0063] (Effects of the golf club head manufacturing method according to this embodiment) According to the golf club head manufacturing method of this embodiment, the inclined end face 22a of the second layer 22 causes the thickness of the clad material 20 to change more gradually than in a configuration in which the end face is formed vertically, thereby alleviating stress concentration and improving the deformation characteristics of the clad material as a whole compared to a configuration in which the end face is formed vertically, resulting in improved impact characteristics of the head.

[0064] (Variation) Fig. 8 is a diagram showing the cross-sectional shape of a modified example. In the example of Fig. 8, the end face of the second layer 22 includes an inclined surface 22a-2. The inclination angle of this inclined surface 22a-2 is, by way of example, the same as in the above embodiment. The inclined surface 22a-2 is an inclined portion provided so as to incline from above the rising portion 22a-1 on the lower side of the end face of the second layer 22, while leaving the rising portion 22a-1 intact.

[0065] In this example, the rising portion 22a-1 is a wall surface that rises upward from the upper surface of the first layer 21. As an example, the rising portion 22a-1 extends at an angle of 90° (perpendicular) to the upper surface of the first layer 21. The rising portion 22a-1 may also extend within an angle range of 90°±10°.

[0066] In this way, according to the configuration in which the inclined surface 22a-2 is formed while the rising portion 22a-1 remains, the thickness of the peripheral portion of the second layer 22 is thicker than in the above embodiment, which makes it less likely for the members to peel off at the interface between the first layer 21 and the second layer 22. In addition, there is an advantage that milling is easier than in the configuration of the above embodiment.

[0067] However, if the range of the rising portion 22a-1 is too large, it becomes difficult to obtain the effect of the present invention. Therefore, in one embodiment, the rising portion 22a-1 is preferably 1 / 2 or 1 / 4 or less of the thickness of the second layer 22.

[0068] The present invention has been described above using embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. For example, all or part of the device can be configured by functionally or physically distributing or integrating any unit. Furthermore, new embodiments resulting from any combination of multiple embodiments are also included in the embodiments of the present invention. The effects of the new embodiments resulting from the combination also have the effects of the original embodiments.

[0069] If there are a plurality of identical or corresponding structural parts or elements, the technical features of a given structural part or element are also applicable to the other structural parts or elements. [Explanation of symbols]

[0070] 10 Head body 10a Fixed part 10h opening 10t end face 11 Face 12 Crown part 13 Sole 14 Side section 15 Hosel 20 Clad Material 21 1st layer 21a Fixed part 21t end face 22 2nd layer 22a End face 30 Neck member S100 Golf Club Head

Claims

1. A golf club head comprising a head body having a face portion, a crown portion, and a sole portion, At least a portion of the sole portion is made of a clad material, The clad material is a first layer of a first metallic material; a second layer made of a second metal material different from the first metal material; the second layer is disposed so as to face the inside of the head body, and in a cross-sectional view in the thickness direction of the clad material, an end face of a peripheral edge of the second layer includes an inclined portion inclined at an angle of 30° to 85° in a positive taper direction with respect to a folding line direction of the surface of the first layer, The second metal material has a specific gravity greater than that of the first metal material. Golf club head.

2. A golf club head comprising a head body having a face portion, a crown portion, and a sole portion, At least a portion of the sole portion is made of a clad material, The clad material is a first layer of a first metallic material; a second layer made of a second metal material different from the first metal material; the second layer is disposed so as to face the inside of the head body, and in a cross-sectional view in the thickness direction of the clad material, an end face of a peripheral edge of the second layer includes an inclined portion inclined at an angle of 30° to 85° in a positive taper direction with respect to a folding line direction of the surface of the first layer, the inclined portion is formed above the rising portion, with the rising portion remaining as a peripheral wall of the second layer and rising from the surface of the first layer. Golf club head.

3. the first layer is pure titanium or a titanium alloy; the second layer is stainless steel; 3. The golf club head according to claim 1.

4. the first layer is fixed to the head body by welding an end surface of the first layer to an end surface of a member of the head body; 3. The golf club head according to claim 1.

5. A method for manufacturing a golf club head having a head body having a face portion, a crown portion, and a sole portion, comprising: A step of preparing a clad material in which a first layer made of a first metal material and a second layer made of a second metal material different from the first metal material are laminated; a step of cutting the second layer while leaving a portion of the material constituting the second layer; and The step of cutting the second layer includes cutting the end face of the second layer so that the end face of the peripheral portion of the second layer includes an inclined portion that is inclined in a positive taper direction at an angle of 30° to 85° relative to the fold line direction of the surface of the first layer in a cross section of the thickness direction of the clad material, and includes cutting the end face so that the inclined portion is formed above the rising portion that rises from the surface of the first layer as a peripheral wall of the second layer. A method for manufacturing a golf club head.

6. In the step of cutting the end surface of the second layer, the end surface is cut by milling using a rotating tool. The method for manufacturing a golf club head according to claim 5 .

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