TW202302189A - Golf shaft and manufacturing method for same - Google Patents

Abstract

Provided is a golf shaft with which it is possible to obtain a sufficiently-low trajectory and a low spin. This invention has a rigidity distribution in which the rigidity increases gradually from a distal end section 5 to a base end section 7. In this rigidity distribution, an intermediate section 9, which is between the distal end section 5 and the base end section 7, includes an intermediate point P at which inclination changes. A difference in the rigidity between the distal end section 5 and the intermediate point P is 3.00 kgf· m2 to 5.00 kgf· m2, and a difference in the rigidity between the intermediate point P and the base end section 7 is 2.00 kgf· m2 or less.

Description

Golf club shaft and manufacturing method thereof

The present invention relates to a golf club body that realizes low trajectory and low spin and a manufacturing method thereof.

In golf, it is known that a ball's flight distance will be elongated by high trajectory and low spin. Such a ball with high trajectory and low spin can be realized by adjusting the rigidity distribution of the shaft of the golf club (golf club shaft), as described in Patent Document 1, for example.

The above-mentioned high-trajectory and low-spin ball is easily affected by the wind, and there may be cases where the flight distance cannot be extended. In this case, a ball with low trajectory and low spin, which reduces trajectory, is beneficial.

Generally speaking, this ball with low ballistic and low spin can be realized only by increasing the rigidity of the front end of the golf club shaft, but simply improving the rigidity of the front end is still insufficient.

[Prior art literature] [Patent Document] [Patent Document 1] Japanese Unexamined Patent Publication No. 2014-33831.

[Problems to be Solved by the Invention] The problem to be solved by the present invention is that it is not possible to obtain sufficient low trajectory and low spin.

[Technical Means to Solve the Problem] The present invention provides a golf club body having a rigidity distribution in which the rigidity gradually increases from the tip end to the base end, and in the rigidity distribution, there is a gap between the tip end and the base end. The middle part between has a middle point with a slope change, the rigidity difference between the front end and the middle point is 3.00kgf·m ² ~5.00kgf·m ² , the rigidity difference between the middle point and the base end is 2.00kgf・^m2 or less.

Also, the present invention provides a method of manufacturing a golf club body having a rigidity distribution in which the rigidity gradually increases from the front end to the base end; in the basic shape of the golf club shaft, The intermediate portion between the front end portion and the base end portion has: a body portion; a plurality of adjustment section portions on the front end side with respect to the body portion and having different outer diameters; and a straight portion at the front end relative to the adjustment section portion. The side and the outer diameter are fixed, and relative to the basic shape, the length of the base end is extended in the axial direction by one or more adjustment segments, and the adjustment segment corresponding to the length extension of the base end is removed.

[Efficacy of the invention] In the golf club body of the present invention, the rigidity of the front end portion and the base end portion is appropriately set in relation to the middle point, so that sufficiently low trajectory and low spin can be obtained.

In the method of manufacturing a golf club body of the present invention, it is necessary to obtain a golf club body with sufficiently low trajectory and low spin, and to obtain a golf club body whose rigidity gradually increases from the front end to the base end. In the body, it is easy to develop products with various hardness.

The present invention achieves the purpose of obtaining sufficient low trajectory and low spin through the rigidity distribution of the golf club shaft.

That is, the golf club body 1 has a rigidity distribution in which the rigidity gradually increases from the front end portion 5 to the base end portion 7 . In this rigidity distribution, there is an intermediate point P where the slope changes in the intermediate portion 9 between the distal end portion 5 and the base end portion 7, and the rigidity difference between the distal end portion 5 and the intermediate point P is 3.00kgf·m ² to 5.00kgf・m ² , the difference in rigidity between the intermediate point P and the base end portion 7 is 2.00 kgf・m ² or less.

The middle point P may be located within a range of 40% to 60% of the total length from the front end of the golf club body 1 .

The golf club body 1 has a stepped shape in which the outer diameter gradually increases between the front end portion 5 and the base end portion 7. The difference in outer diameter is smaller than the difference in outer diameter between adjacent segments 17 from the front end 5 to the intermediate point P.

A method of manufacturing a golf club body is a method described later: a golf club 1 having a rigidity distribution that gradually increases from the tip end 5 to the base end 7 is manufactured. This manufacturing method is that, in the basic shape, the middle part 9 between the front end part 5 and the base end part 7 has: a main body part 11; Different; and the straight portion 15 is fixed on the front end side with respect to the adjustment segment 13, and the outer diameter is fixed, and the length of the base end portion 7 is extended to the axial direction by one or more adjustment segment portions 13 with respect to the basic shape. , and the adjustment section 13 corresponding to the length extension of the base end portion 7 is removed.

In this manufacturing method, the outer diameter of the straight portion 15 can be made the same as the largest outer diameter of the removed adjustment section 13 .

[Example 1] [Structure of golf club body] Fig. 1 is a side view of a golf club according to Embodiment 1 of the present invention.

The golf club body 1 of this embodiment is a metal shaft, which is composed of a metal hollow tube. As a whole, the golf club body 1 has an outer diameter gradually increasing like a step shape. On the other hand, the cross-sectional shape of the golf club body 1 is circular. Incidentally, the outer diameter of the golf club body 1 may be non-stepped, or may be in other shapes such as a cone shape in whole or in part. Also, the cross-sectional shape of the golf club body 1 may be another shape such as an ellipse.

The length of the golf club body 1 is 37-41 inches (about 93.98-104.14 cm). However, it should be noted that the golf club body 1 can also be set to be shorter than 37 inches, or can be set to be longer than 41 inches. Also, although the material of the golf club body 1 is steel, other materials may also be used. As for other materials, there are other metals, such as aluminum or titanium and their alloys, or non-metals such as CFRP (carbon fiber reinforced plastic), or composite materials composed of metals and non-metals.

The golf club body 1 is composed of a front end portion 5 , a base end portion 7 and a middle portion 9 .

The front end portion 5 is the front end portion in the axial direction, and refers to an area within a predetermined range from the front end of the golf club body 1 in the axial direction. The tip portion 5 of the present embodiment is a portion in which the head of the golf club is assembled. The tip portion 5 is formed in a tapered shape whose outer diameter slightly increases toward the base end side of the golf club body 1 . However, it should be noted that the front end portion 5 may also be formed in a straight shape with a constant outer diameter.

The base end portion 7 is the base end portion of the golf club shaft 1 in the axial direction, and refers to an area within a predetermined range from the base end of the golf club shaft 1 in the axial direction. The base end portion 7 of the present embodiment is a portion to which a grip of a golf club is assembled. Although the base end portion 7 is formed in a straight shape with a constant outer diameter, it may be formed in a tapered shape in which the outer diameter slightly changes toward the base end side.

The middle portion 9 is a portion located between the front end portion 5 and the base end portion 7 , and is composed of a main body portion 11 , a plurality of adjustment sections 13 , a straight portion 15 and a tapered portion 16 .

The main body portion 11 is a portion formed in a stepped shape as a whole, and is composed of a plurality of step portions 17 . The outer diameters of the plurality of stages 17 gradually increase toward the base end side. Although the outer diameter of each step portion 17 is uniform, the outer diameter may gradually increase toward the base end side.

The stepped shape of the main body 11 is such that the difference in outer diameter between adjacent segments 17 from an intermediate point P (refer to FIG. 2 ) to the proximal end 7 is smaller than that of adjacent segments 17 from the distal end 5 to the intermediate point P. The outer diameter difference between the segments 17. Incidentally, when the intermediate point P is located in the segment 17 section, as long as the outer diameter difference between the segment 17 where the intermediate point is located and the segment 17 at the previous position or the subsequent position is set to be smaller than that from the front end to the The outer diameter difference between adjacent segment portions 17 in the segment portion where the intermediate point P is located is sufficient. Further, the step portion 17 from the intermediate point P to the base end 7 is set to be longer in the axial direction than the axial dimension of the step portion 17 from the distal end portion 5 to the intermediate point P.

This body portion 11 is a portion that does not change in shape regardless of the hardness type of the golf club body 1 . The hardness of the golf club body 1 refers to the softness and hardness of the golf club 1 , and even for the same golf club body 1 , generally, various types of products are developed.

The plurality of adjustment sections 13 are sections for adjusting the hardness of the golf club shaft 1 . The number of these adjustment segments 13 will decrease as the hardness becomes harder as will be described later in the specification. Therefore, depending on the hardness, the golf club body 1 may not have the adjustment segment 13 in some cases. Incidentally, the configuration is not limited to the hardness, and the adjustment section 13 is not provided at all.

The plurality of adjustment sections 13 are located at the front end side relative to the main body 11 and have different outer diameters. In this embodiment, the adjustment section 13 is generally in a stepped shape adjacent to the main body portion 11 and continues the stepped shape of the main body portion 11 . These adjustment segments 13 are the same as the segments 17 of the main body 11 , and the outer diameter gradually increases toward the base end side.

Incidentally, it is not necessary for the adjustment section 13 to be adjacent to the main body 11 , and a cone or section can also be inserted between the adjustment section 13 and the main body 11 .

The outer diameter of each adjustment section 13 is constant. However, it should be noted that the outer diameter of the adjustment section 13 can also be set to gradually increase toward the base end side. The plurality of adjustment segments 13 have the same length in the axial direction. However, it should be noted that the axial lengths of the plurality of adjustment segments 13 can also be different according to the hardness development requirements.

The straight portion 15 is a portion located on the front end side with respect to the adjustment section 13 and having a fixed outer diameter. Incidentally, if the straight portion 15 is omitted from the adjustment section 13 , it may be inserted between the front end portion 5 and the main body portion 11 of the middle portion 9 .

The straight portion 15 of this embodiment is inserted between the front end portion 5 and the adjustment section 13 , and its outer diameter is smaller than the outer diameter of the smallest part of the adjustment section 13 and larger than the outer diameter of the front end portion 5 . The outer diameter of the straight portion 15 is set to become larger as the hardness becomes harder, as will be described later in the specification. Incidentally, although the straight portion 15 is adjacent to the adjustment section 13 , a cone or a section can also be inserted between the adjustment section 13 and the straight portion 15 .

The tapered portion 16 is a tapered portion arranged between the straight portion 15 and the tip portion 5 , and absorbs the difference in outer diameter between the straight portion 15 and the tip portion 5 .

The golf club body 1 configured as described above has a rigidity distribution in which the rigidity gradually increases from the front end portion 5 to the base end portion 7 . Incidentally, the gradual increase in rigidity means that in the rigidity distribution, the slope of the approximate straight line formed by the line segment from the front end 5 to the base end 7, the line connecting the front end 5 and the base end 7 The slope of , or the average value of the slope of the line segment from the front end portion 5 to the base end portion 7 is positive. However, in this limitation, the case where the rigidity slightly decreases from the front end portion 5 to the base end portion 7 is also included in the case where the rigidity gradually increases.

In the case of a decrease in rigidity, in order to obtain sufficiently low ballistics and low spin, the allowable decrease in rigidity is set to be 10% or less of the difference in rigidity between the front end portion 5 and the base end portion 7 . The amount of reduction refers to the rigidity difference between the peak portion on the distal side and the valley portion on the proximal side adjacent to each other in the rigidity distribution.

FIG. 2 shows the rigidity distribution of the golf club 1 . Incidentally, in Fig. 2, the length of the golf club 1 is 41 inches, and the weight is 110g, which is lighter than the general golf clubs of the same length.

As shown in the rigidity distribution of FIG. 2 , in the golf club 1 of this embodiment, the rigidity of the front end portion 5 and the base end portion 7 is fixed, and the intermediate portion 9 in the portion spanning from the front end portion 5 to the base end portion 7 Rigidity increases gradually. This rigidity distribution is set according to the stepped shape and thickness of the golf club 1. As described later in the specification, it is adjusted according to the axial length of the base end portion 7, the number of adjustment segments 13, and the outer diameter of the straight portion 15.

In the described rigidity distribution, the middle part 9 has a middle point P with a changing slope. The slope here means the slope on the distal side and the slope on the proximal side with the intermediate point P as the center. Incidentally, in this specification, the middle point P is not only a point where the slope of the rigidity distribution changes, but also means a portion corresponding to this point in the axial direction of the golf club 1 .

The slope on the front end side is the slope of an approximate straight line formed by the line segment from the front end 5 to the middle point P, the slope of a line connecting the front end 5 and the middle point P, or the slope from the front end 5 to the middle point 9. The average value of the slope of the line segment, etc. The slope of the base end side is the slope of an approximate straight line formed from the middle point P to the line segment in the base end portion 7, the slope of a line connecting the middle point P and the base end portion 7, or the slope from the middle point P to the base end portion 7. The average value of the slope of the line segment in end 7, etc.

The slope of the front end side is larger than the slope of the base end side. And this can be adjusted according to the outer diameter difference and axial dimension difference of the adjacent segments 17 in the stepped shape.

In the above rigidity distribution, the rigidity difference between the front end 5 and the middle point P is 3.00kgf·m ² ~5.00kgf·m ² , while the rigidity difference between the middle point P and the base end 7 is 2.00kgf·m 2 . kgf・^m2 or less. In this embodiment, the rigidity of the front end portion 5 is the rigidity at a position 50 mm from the front end, but when the rigidity of the front end portion 5 fluctuates, it can be set as the average value, maximum value, minimum value, etc. of the front end portion 5 . The rigidity of the base end portion 7 refers to the rigidity of any part of the base end portion 7 . However, it should be noted that when the rigidity of the base end portion 7 varies in the axial direction, it can be set as an average value, a maximum value, a minimum value, or the like.

The middle point P is preferably located within a range of 40% to 60% of the entire length of the golf club body 1 from the front end of the golf club body 1 . On the other hand, the rigidity of the intermediate point P is preferably 5.40 kgf·m ² to 8.00 kgf·m ² . More preferably, the rigidity of the front end portion 5 is 2.20 kgf·m ² or more, and the rigidity of the base end portion 7 is 9.00 kgf·m ² or less. In this embodiment, the middle point P is located at 50% of the total length, and the rigidity of the middle point P is 6.06kgf·m ² . The rigidity of the front end portion 5 is 2.30 kgf·m ² , and the rigidity of the base end portion 7 is 7.39 kgf·m ² . Incidentally, the rigidity and position of the intermediate point P, and the rigidity of the front end portion 5 and the base end portion 7 may also be numerical values other than those described above.

Also, in this embodiment, the rigidity at the position from the front end to 20% of the total length is set to not exceed 4.00kgf·m ² .

With this distribution of rigidity, in the golf club body 1 of this embodiment, in relation to the intermediate point P, by increasing the rigidity of the front end portion 5 and reducing the rigidity of the base end portion 7, the deflection speed becomes slow. , can make the ball angle smaller. In addition, since the rigidity of the intermediate point P is high, the amount of rotation can be reduced. As a result, sufficiently low trajectory and low spin can be obtained in the golf club shaft 1 of this embodiment.

Fig. 3 is a graph showing the ball launch angle and rotation amount of the golf club body 1 of this embodiment together with a comparative example, and Fig. 4 is a view showing the rigidity distribution of Fig. 2 together with the rigidity distribution of a comparative example . Incidentally, only Comparative Example 3 has a length of 39 inches in order to match the number of golf clubs with other comparative examples.

Comparative example 1 is low ballistic and not low spin, comparative example 2 is high ballistic and low spin, and comparative example 3 is both ballistic and spin.

In Comparative Example 1, compared with Comparative Example 3, the rigidity of the distal end portion side was set to be high, while the rigidity of the proximal end portion was set to be low. In Comparative Example 2, compared with Comparative Example 3, the rigidity of the entire region from the middle portion to the base end portion was set to be higher.

On the other hand, in this example, compared with Comparative Example 3, the rigidity is set to be high from the front end portion to the middle portion, and the rigidity is set to be low from the middle portion to the base end portion. Also, in this embodiment, the rigidity of the intermediate portion 9 falls between Comparative Examples 1 and 2.

Due to the above differences, in this embodiment, compared with Comparative Example 1 in which the rigidity of the front end side is simply increased, the ball launch angle can be equal while the amount of spin can be reduced. Also, the rotation amount of this example is lower than that of comparative example 2 with low rotation.

[manufacturing method of golf club] In the manufacturing method of the golf club body 1 of this embodiment, for example, the sheet material is curled to form a tube body with a fixed inner and outer diameter. Step processing is performed on this pipe body and the thickness is set at the same time.

At this time, in this embodiment, the hardness is adjusted according to the axial length of the base end portion 7 , the number of the adjustment segment portions 13 , and the setting of the outer diameter of the straight portion 15 .

The adjustment of the hardness is carried out on the basic shape shown in Fig. 5 . FIG. 5 is a side view showing the basic shape used in the manufacturing method of the golf club body 1 of this embodiment.

In the basic shape: the middle part 9 has a main body part 11 , a plurality of adjustment section parts 13 and a straight part 15 . In this embodiment, the basic shape has three adjustment segments 13 , so the base end 7 is set shorter than the golf club shaft 1 in FIG. 1 . Also, the basic shape does not have the tapered portion 16 . Other parts are the same as the golf club shaft 1 in FIG. 1 . Incidentally, in the basic shape, adjusting the number of segments 13 or the size of each part can be changed according to the characteristics of the golf club body 1 .

The adjustment of the hardness is carried out by the following method: relative to the basic shape, the length of the base end portion 7 is extended in the axial direction by one or more adjustment segments 13, and the adjustment corresponding to the length extension of the base end portion 7 is removed. Section 13. Thereby, the hardness can be adjusted without changing the rigidity distribution of the main body part 11 .

Furthermore, the outer diameter of the straight portion 15 is made the same as the largest outer diameter of the removed adjustment section 13 . Thereby, the rigidity on the front end side is increased, and the increase in the slope of the rigidity distribution from the front end portion 5 to the intermediate point P is suppressed. At this time, the tapered portion 16 is formed in order to absorb the difference in outer diameter between the front end portion 5 and the straight portion 5 .

Incidentally, the hardness adjustment (manufacturing method) of the present embodiment can be applied to other golf club bodies besides the golf club body 1 for obtaining low trajectory and low spin. On the other hand, in other golf club bodies, it is not necessary to suppress the increase in the slope of the rigidity distribution from the front end portion 5 to the middle point P at the time of hardness adjustment. In this case, the outer diameter of the straight portion 15 does not need to be changed during hardness adjustment, and can maintain the original outer diameter value in the basic shape.

6(A) to (D) show golf club shafts 1 with different stiffnesses to achieve low ballistics and low spin. The golf club shafts 1 in Fig. 6 (A) to (D) are hardened in the order of the numbers in the figures, and the codes are respectively R, S, X, and TX.

The basic shape of the golf club body 1 in FIG. 6(A) is the same as that in FIG. 5 . The golf club shaft 1 in FIG. 6(B) is the same as the golf club shaft 1 in FIG. 5 , but compared to the basic shape in FIG. 5 , the adjustment section 13 with the smallest outer diameter is removed. The golf club body 1 in FIG. 6(C) has removed the two adjustment sections 13 with the smallest and second smallest outer diameters, and the golf club shaft 1 in FIG. 6(D) has removed all the adjustment sections. 13.

In the golf club shafts 1 of FIGS. 6(B) to 6(D), the length of the base end portion 7 is extended in the axial direction by one, two, and three adjustment step portions 13 . 6 (B) ~ (D) golf club body 1 is to make the outer diameter of the straight portion 15 are set to be the same as the first section of the adjustment section 13, the second section, the third section of the outer diameter. path.

With this setting of the outer diameter, in the golf club body 1 of FIGS. Between the straight portion 15 and the front end portion 5 . However, in this embodiment, the larger the difference in outer diameter between the straight portion 15 and the front end portion 5 is, the longer the axial direction of the tapered portion 16 is set. Thereby, it can suppress that the taper angle of the taper part 16 becomes large.

7(A) and (B) show the rigidity of the front end, the middle point, and the base end of the golf club body 1 in FIGS. 6(A) to (D) together with the rigidity corresponding to the comparative example. Fig. 7 (A) is the situation of 41 inches, and Fig. 7 (B) is the situation of 37 inches. In FIG. 7 , the hardnesses of the golf club body 1 in FIGS. 6(A) to (D) are represented as R, S, X, and TX, respectively. The middle-tip represents the difference in rigidity between the middle point P and the front end 5 , and the base-middle represents the difference in rigidity between the base end 7 and the middle point P. The unit of the numerical system in Fig. 7 is kgf·m ² .

As shown in FIG. 7 , in the golf club body 1 of this embodiment, the middle-tip is 3.00 to 5.00 kgf·m ² , and the base-middle is 2.00 kgf·m ² or less. In contrast, Comparative Examples 1 and 2 cannot simultaneously satisfy the middle-tip of 3.00 to 5.00 kgf·m ² and the base-middle of 2.00 kgf·m ² or less. As a result, in Comparative Examples 1 and 2, low trajectory and low spin as shown in Figure 3 could not be obtained.

[Efficacy of Embodiment 1] As described above, the golf club body 1 of this embodiment is in a rigid distribution in which the rigidity gradually increases from the front end portion 5 to the base end portion 7. The middle part 9 between 7 has a middle point P whose slope changes, and the rigidity difference between the front end part 5 and the middle point P of the middle part 9 is 3.00kgf・^m2 ～5.00kgf・^m2 , and the middle point of the middle part 9 The difference in rigidity between P and the base end portion 7 is 2.00 kgf·m ² or less.

Therefore, in the golf club body 1 of this embodiment, in relation to the intermediate point P, by increasing the rigidity of the front end portion 5 and reducing the rigidity of the base end portion 7, the ball launch angle can be reliably reduced. , and can reliably reduce the amount of rotation. As a result, sufficiently low trajectory and low spin can be obtained in the golf club shaft 1 of this embodiment.

Also, in the golf club body 1, since the middle point P is located in the range of 40% to 60% of the total length of the golf club body 1 from the front end of the golf club body 1, it can be more reliably obtained. Low trajectory and low spin.

The golf club body 1 has a stepped shape in which the outer diameter gradually increases between the front end portion 5 and the base end portion 7. The difference in outer diameter is smaller than the difference in outer diameter between adjacent segments 17 from the front end 5 to the intermediate point P.

Therefore, it is possible to obtain the golf club shaft 1 that can easily and reliably achieve low ballistics and low spin.

The method of manufacturing the golf club body 1 of this embodiment is to extend the length of the base end portion 7 in the axial direction by one or more adjustment sections 13 relative to the basic shape, and remove the length corresponding to the base end portion 7 The extension can be adjusted to produce golf club shafts 1 with different hardness.

Thus, in this embodiment, it is possible to develop products having various hardnesses without changing the rigidity distribution of the main body portion 11 . In addition, in this embodiment, the hardness can be judged from the appearance by the number of adjustment segments 13 of the manufactured golf club body 1 . Furthermore, by setting the length and outer diameter of the adjustment section 13, it is possible to easily develop the hardness required by the product.

Also, in the present embodiment, the outer diameter of the straight portion 15 is made the same as the largest outer diameter among the removed adjustment segment portions 13 . Therefore, in the golf club body 1 with low trajectory and low spin, it is possible to easily develop products with various hardnesses.

1: golf club body 5: front end 7: base end 9: middle part 11: Main body 13: Adjust the section 15: straight part P: middle point

FIG. 1 is a side view of a golf club body according to Embodiment 1 of the present invention. Fig. 2 is a diagram showing a rigidity distribution of the golf club body of Fig. 1 . FIG. 3 is a graph showing a launch angle and a spin amount of the golf club body of FIG. 1 together with a comparative example. FIG. 4 is a view showing the rigidity distribution of FIG. 2 together with the rigidity distribution of a comparative example. 5 is a side view of a golf club body showing a basic shape used in the method of manufacturing a golf club body according to Example 1 of the present invention. 6(A) to (D) are side views showing golf club bodies with different hardness. FIGS. 7(A) and (B) are graphs showing the rigidities of the front end, intermediate point, and base end of the golf clubs of FIGS. 6(A) to (D) together with rigidities corresponding to comparative examples.

1: golf club body

5: front end

7: base end

9: middle part

11: Main body

13: Adjust the section

15: straight part

16: cone part

17: section department

Claims (5)

A golf club body having a rigidity distribution in which rigidity gradually increases from a front end portion to a base end portion, and in the rigidity distribution, an intermediate point where a slope changes at an intermediate portion between the front end portion and the base end portion , the rigidity difference between the front end portion and the intermediate point is 3.00kgf·m ² to 5.00kgf·m ² , and the rigidity difference between the intermediate point and the base end portion is 2.00kgf·m ² or less. The golf club body according to claim 1, wherein, The distance from the front end to the intermediate point is in the range of 40% to 60% of the total length. The golf club body according to claim 1 or 2, wherein, The golf club body has a stepped shape in which the outer diameter gradually increases between the front end portion and the base end portion. The difference in outer diameter is smaller than the difference in outer diameter between adjacent stages from the front end to the middle point. A method of manufacturing a golf club body having a rigidity distribution in which the rigidity gradually increases from a front end to a base end; In a basic shape of the golf club body, the intermediate portion between the front end portion and the base end portion has: a main body portion; a plurality of adjustment sections with different outer diameters on the front end side relative to the main body portion ; and a straight portion, which is on the front end side with respect to the adjustment section and has a fixed outer diameter, With respect to the basic shape, the length of the base end is extended in the axial direction by one or more adjustment segments, and the adjustment segments corresponding to the length extension of the base end are removed. The method of manufacturing a golf club body according to claim 4, wherein: Make the outer diameter of the straight portion the same as the largest outer diameter in the removed adjustment section.

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