JP2008295938A - Manufacturing method of shaft for golf club - Google Patents

Abstract

An object of the present invention is to provide a method for manufacturing a golf club shaft that can pull out a mandrel from the golf club shaft without damaging the golf club shaft.
The present invention is a method of manufacturing a shaft for a golf club which performs the following (1) to (6). (1) The prepreg is wound around the mandrel so that the end on the large diameter side of the mandrel is exposed and laminated to obtain a prepreg laminate. (2) The tape-shaped prepreg is wrapped around the end portion of the prepreg laminate and the mandrel. Form the reinforcing part 3. (3) Heat cure to obtain a shaft with the reinforcing part 3 on the mandrel. (4) Provide a hole through which the large diameter end of the mandrel passes but the reinforcing part 3 does not pass. The member 4 is inserted from the large-diameter side end of the mandrel, and is attached to the reinforcing portion 3. (5) The member 4 provided with the hole is supported, and the mandrel is pulled out from the shaft 1. (6) The reinforcing portion 3 is The end portion of the shaft 1 is cut.
[Selection] Figure 4

Description

  The present invention relates to a method for manufacturing a golf club shaft, and more particularly to a method for pulling out a mandrel.

In recent years, a shaft made of FRP (Fiber Reinforced Plastics, fiber reinforced resin composite material) using carbon fiber as a main reinforcing fiber has been used as a shaft of a golf club.
The FRP shaft can be obtained by preparing a sheet-like prepreg obtained by impregnating reinforcing fibers with an uncured thermosetting resin, winding the prepreg around a rod-shaped mandrel, and then curing the prepreg. Thereafter, the target golf club shaft can be obtained through steps such as drawing, cutting, and polishing (see Patent Document 1).

According to the above manufacturing method, since the mandrel remains in the hollow portion of the golf club shaft, a step of pulling out the mandrel is necessary. Conventionally, as shown in FIG. 8, the mandrel 2 is moved by pulling the mandrel 2, and at the same time, the difference in diameter between the mandrel 2 and the large-diameter side end 11 of the golf club shaft 1 is utilized. The support member 5 provided with a hole through which the mandrel passes from the large-diameter side end portion but does not allow the large-diameter side end portion 11 of the golf club shaft 1 to pass through supports the golf club shaft 1 alone. The mandrel 2 has been pulled out from the shaft 1 for use.
Japanese Patent No. 2971374

However, according to the conventional method, the golf club shaft is in direct contact with the support member, which causes problems such as damage and cracking of the golf club shaft, resulting in defective products. was there.
An object of the present invention is to provide a method for producing a golf club shaft that can pull out a mandrel from the golf club shaft without damaging the golf club shaft.

The present invention is a golf club shaft manufacturing method in which the following (1) to (6) are sequentially performed.
(1) A prepreg laminate is obtained by winding a prepreg obtained by impregnating a reinforcing fiber with a thermosetting resin around a mandrel so that the large-diameter side end of the mandrel is exposed, and laminating.
(2) A tape-shaped prepreg is wound around the end portion of the obtained prepreg laminate and the exposed mandrel to form a reinforcing portion.
(3) By heating, the thermosetting resin in the prepreg and the tape-shaped prepreg is cured to obtain a golf club shaft with a reinforcing portion on the mandrel.
(4) A member provided with a hole through which the large diameter side end portion of the mandrel passes but the reinforcing portion does not pass is inserted from the large diameter side end portion of the mandrel, and is attached to the reinforcing portion.
(5) supporting a member provided with a hole, and pulling out the mandrel from the golf club shaft;
(6) The end portion of the golf club shaft including the reinforcing portion is cut.
In the production method of the present invention, instead of (4), (4 ') a member provided with a hole through which the mandrel's large-diameter side end is passed but the reinforcing portion is not passed is inserted from the mandrel's large-diameter side end, It is also possible to attach to the end portion on the large diameter side of the reinforcing portion.
It is preferable to insert a member provided with a hole through which the mandrel is inserted from the large diameter side end portion but not through the reinforcing portion from the large diameter side end portion of the mandrel, and is attached to the large diameter side end portion of the reinforcing portion.
In the manufacturing method of this invention, it is preferable that the thickness of a reinforcement part is 0.3-5 mm.
In the manufacturing method of this invention, it is preferable that the width | variety of a reinforcement part is 5-10 mm.

  According to the shaft manufacturing method of the present invention, the mandrel can be pulled out from the golf club shaft without directly contacting the member to the golf club shaft, and thus without damaging the golf club shaft. It is difficult to produce defective products. In particular, when a member provided with a hole through which the large diameter side end portion of the mandrel passes but not through the reinforcement portion is inserted from the large diameter side end portion of the mandrel and is attached to the large diameter side end portion of the reinforcement portion, The effect becomes remarkable.

  The present invention relates to a method for manufacturing a golf club shaft using a mandrel, and more particularly to a method for pulling out a mandrel 2 from a golf club shaft 1 as shown in FIG. Hereinafter, embodiments of the drawing method will be described. In this embodiment, the mandrel is tapered and the mandrel is circular in cross section. However, the present invention is not limited to this embodiment. .

In the present invention, as shown in FIG. 2, a prepreg obtained by impregnating a reinforcing fiber with a thermosetting resin is wound around and laminated on a mandrel 2 so that the large-diameter side end of the mandrel 2 is exposed. A laminate 100 is obtained.
Next, a tape-shaped prepreg 30 a having a width L as shown in FIG. 2 is wound around the end portion 101 of the obtained prepreg laminate 100 and the exposed mandrel 2 to form the reinforcing portion 3. Moreover, as shown in FIG. 3, the tape-shaped prepreg 30b whose width is narrower than L may be wound at a predetermined pitch to form the reinforcing portion 3 having the width L.
Next, the tape 10 having heat shrinkability is usually wound around the obtained prepreg laminate 100 and the reinforcing portion 3 at a constant pitch.
Thereafter, by heating, the thermosetting resin in the prepreg laminate 100 and the tape-shaped prepreg 30a is cured, and as shown in FIGS. 4 and 5, the golf club shaft with the reinforcing portion 3 on the mandrel 2 is provided. 1 can be obtained.

The width L (FIG. 2) of the reinforcing part is preferably 5 to 10 mm. If the width L is 5 mm or more, the support receiving member 4 to be described later can be securely attached, and if it is 10 mm or less, it is difficult to prevent the mandrel 2 from being pulled out.
The widths of the shaft and mandrel are preferably uniform, and at least both the shaft and mandrel preferably have a width of 2.5 mm or more.
As for the number of turns, as shown in FIGS. 4 and 5, the diameter b1 of the reinforcing portion 3 only needs to be larger than the diameter a of the large diameter end portion of the mandrel, but the thickness of the reinforcing portion is 0.3. It is preferable to wind it to be ˜5 mm. Thereby, the reinforcement part 3 is formed and the support receiving member 4 mentioned later can be mounted | worn, and the large diameter side edge part 11 of the shaft 1 for golf clubs can be protected.

The tape-shaped prepreg and the prepreg as a shaft raw material can be formed by impregnating reinforcing fibers laid in parallel or woven reinforcing fibers into a sheet shape by impregnating a thermosetting resin. For example, a UD prepreg containing reinforcing fibers aligned in parallel, a woven prepreg containing woven reinforcing fibers, and the like can be used.
When a UD prepreg is used as the reinforcing member, the fiber direction is preferably matched with the circumferential direction.

  Carbon fiber is preferred as the reinforcing fiber used in the prepreg, but in addition to carbon fiber, metal fiber, aramid fiber, silicon carbide fiber, alumina fiber, boron fiber can be used alone or in combination of two or more. You may use it in combination.

The thermosetting resin impregnated into the reinforcing fiber is not particularly limited, and examples thereof include an epoxy resin, an unsaturated polyester resin, an acrylic resin, and a phenol resin. In particular, an epoxy resin is preferable for obtaining a high-strength shaft and reinforcing member 3.
Examples of epoxy resins include bifunctional epoxy resins: bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, biphenyl type epoxy resin, naphthalene type epoxy resin, dicyclopentadiene type epoxy resin, fluorene type Examples thereof include epoxy resins and epoxy resins obtained by modifying them. Examples of the trifunctional or higher polyfunctional epoxy resin include phenol novolac type epoxy resin, cresol type epoxy resin, glycidylamine type epoxy resin such as tetraglycidyldiaminodiphenylmethane, triglycidylaminophenol, tetraglycidylamine, tetrakis (glycidyloxy) Examples thereof include glycidyl ether type epoxy resins such as phenyl) ethane and tris (glycidyloxymethane), epoxy resins obtained by modifying these resins, and brominated epoxy resins obtained by brominating these epoxy resins. Moreover, these epoxy resins may be used individually by 1 type, or may be used in combination of 2 or more type.
Furthermore, the thermosetting resin may be used in the form of a thermosetting resin composition containing various additives such as a curing agent, a release agent, a defoaming agent, an ultraviolet absorber, and a filler.

  The tape 10 is made of a heat-shrinkable synthetic resin, and the shape of the prepreg laminate 100 can be adjusted by winding the tape 10. Further, since the tape 10 has heat shrinkability, the tape 10 can be shrunk simultaneously when heated and the thermosetting resin is cured, whereby the prepreg laminate 100 can be tightened, and the shaft The strength of can be increased. The tape 10 is preferably made of a polypropylene or polyester film that is excellent in heat resistance and inexpensive.

As shown in FIGS. 4 and 5, the mandrel 2 is preferably provided with a reduced-diameter portion 21 at which the holding member 6 can be hooked at the end portion.
The shape of the mandrel 2 may be tapered or straight, and may be selected according to the application.
When the shape of the mandrel 2 has a tapered shape that gradually increases in diameter from the small-diameter side end portion to the large-diameter side end portion, it is necessary to pull the mandrel 2 in the distal direction of the large-diameter portion. 21 is inevitably provided at the end on the large diameter side of the mandrel 2.
Further, the cross-sectional shape of the mandrel 2 is not limited, and may be, for example, a circle, a square, an ellipse, or a hexagon.

Next, members for pulling out the mandrel 2 from the golf club shaft 1 will be described (FIGS. 4 to 7).
As shown in FIGS. 4 to 6, the present invention requires a member 4 (hereinafter also referred to as a support receiving member 4) provided with a hole 41 through which the large-diameter side end portion of the mandrel 2 passes but the reinforcing portion 3 does not pass. It is.
The support receiving member 4 has a hole 41, and the hole 41 may be set so that it can be attached to the reinforcing portion 3. That is, the diameter c of the hole 41 needs to be larger than the diameter a of the large diameter side end portion of the mandrel 2 and smaller than the diameter b2 of the reinforcing portion 3 as shown in FIGS. As a result, the support receiving member 4 can be inserted from the large-diameter side end of the mandrel 2, and as shown in FIGS. 4 and 5, the reinforcing portion 3 (FIG. 4) or the large-diameter side end of the reinforcing portion 3. 32 (FIG. 5).
When the diameter c of the hole 41 is larger than the diameter b1 of the reinforcing portion 3, the support receiving member 4 is attached to the reinforcing portion 3 as shown in FIG.
In addition, as shown in FIG. 5, when the diameter c of the hole 41 is larger than the diameter a of the large diameter side end of the mandrel 2 and less than the diameter b1 of the reinforcing portion 3, a hole 41 through which the reinforcing portion does not pass is provided. The member 4 is inserted from the large-diameter side end of the mandrel and attached to the large-diameter side end 32 of the reinforcing portion 3. That is, as shown in FIG. 5, the support receiving member 4 is hooked on the large-diameter side end portion 32 of the reinforcing portion 3 and attached thereto.
The support receiving member 4 only needs to have a strength capable of withstanding the force applied during pulling, and is preferably made of metal.
Further, the support receiving member 4 may be any member as long as it has the hole 41 having the above-mentioned diameter c. However, as shown in FIGS. It is preferable to have a small diameter portion 42 of e and a large diameter portion 43 of diameter f.

Further, as a member for pulling out, it is preferable that there is a support member 5 capable of supporting the support receiving member 4 as shown in FIGS. 4, 5, and 7. Also, as shown in FIGS. 4 and 5, there may be a holding member 6 that can be pulled out by moving the mandrel by hooking on the reduced diameter portion 21 provided at the large diameter side end of the mandrel 2. preferable.
Here, the support member 5 has a groove 51 as shown in FIG. Preferably, it is semicircular according to the shape of the mandrel. This is because the support receiving member 4 can be easily attached to the groove 51. At this time, as shown in FIGS. 4, 5, and 7, the groove 51 has a diameter d that is larger than the diameter e of the small diameter portion 42 of the support receiving member 4 and smaller than the diameter f of the large diameter portion 43. It is necessary. Thereby, the support receiving member 4 is supported by the support member 5.
For the movement of the holding member 6, for example, a means such as a hydraulic cylinder that moves using the hydraulic pressure may be used.
Moreover, the support member 5 and the holding member 6 should just have the intensity | strength which can bear the force applied in the case of extraction, and it is preferable that they are metal.

In the present invention, as shown in FIGS. 4 and 5, the golf club shaft 1 to which the support receiving member 4 is attached is installed on the support member 5 and the holding member 6, and the support member 5 has a hole 4 ( The support receiving member 4) is supported, and the mandrel 2 can be pulled out from the golf club shaft 1.
When pulling out the mandrel 2 from the golf club shaft 1, the holding member 6 is moved from the small-diameter side end to the large-diameter side end (the arrow direction in FIGS. 4 and 5), so that the mandrel 2 is held by the holding member 6. Move with 6. At the same time, the golf club shaft 1 is supported and fixed in the groove 51 of the support member 5 that is fixed. That is, while the golf club shaft 1 moves in the direction of the arrow in FIGS. 4 and 5, the support receiving member 4 is supported by the support member 5, and the support member 5 serves as a stopper. Accordingly, the mandrel 2 can be moved while the golf club shaft 1 is fixed, and the mandrel 2 can be pulled out from the golf club shaft 1.

  In the present invention, various diameters and shapes can be obtained only by preparing the member 4 (support receiving member 4) provided with several holes 41 having different diameters c in advance, without requiring large-scale equipment. The mandrel 2 can be pulled out from the golf club shaft 1 having the above, and as a result, various types of golf club shafts 1 can be easily manufactured.

Thus, when the mandrel 2 is pulled out, the mandrel 2 is moved from the small-diameter side end to the large-diameter side end (in the direction of the arrow in FIGS. 4 and 5) and fixed to the golf club. The mandrel 2 can be pulled out by fixing the shaft 1.
Further, according to the present invention, the reinforcing portion 3 protects the large-diameter side end portion 11 of the golf club shaft 1, and the support member 5 does not directly contact the golf club shaft 1. Thereby, generation | occurrence | production of the inferior goods of the shaft 1 for golf clubs can be reduced.

  In the above, the support member 5 is fixed, the mandrel 2 is moved from the small-diameter side end to the large-diameter side end (in the direction of the arrow in FIGS. 4 and 5), and the fixed support member 5 is used for the golf club. Although the embodiment in which the mandrel 2 is pulled out from the golf club shaft 1 by fixing the shaft 1 has been described, the pulling method is not limited to the above method. That is, the golf club shaft 1 may be moved from the large-diameter side end to the small-diameter side end (opposite to the arrow direction in FIG. 4) by the support member 5, while the mandrel 2 may be fixed and pulled out.

  As described above, after the mandrel 2 is pulled out of the golf club shaft 1 to obtain the golf club shaft having the reinforcing portion 3 at the large diameter side end portion 11, the large diameter side end of the golf club shaft 1 is obtained. Is cut so as to include the reinforcing portion 3, the golf club shaft 1 can be obtained.

According to the present invention, when the mandrel is pulled out from the golf club shaft, the support member can pull out the mandrel from the golf club shaft without directly contacting the golf club shaft.
As a result, the present invention can easily pull out the mandrel from the golf club shaft 1 without damaging the golf club shaft, thereby making it difficult to produce defective products.

It is a top view which shows the outline of the manufacturing method of a shaft. It is sectional drawing which shows one Embodiment of the reinforcement part before hardening of thermosetting resin in this invention, and a prepreg laminated body. It is sectional drawing which shows the other example of the formation method of a reinforcement part. It is sectional drawing which shows one Embodiment of the extraction method of a mandrel. It is sectional drawing which shows one Embodiment of the extraction method of a mandrel. It is a perspective view which shows one Embodiment of the reinforcement member used in this invention. It is a perspective view which shows one Embodiment of the supporting member used in this invention. It is sectional drawing which shows one Embodiment of the manufacturing method of the conventional shaft.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Golf club shaft 2 Mandrel 3 Reinforcement part 4 Reinforcement member 5 Support member 30a, 30b Tape-like prepreg 41 Hole 100 Pre-preg laminated body 101 (of prepreg laminated body) End part L Width of prepreg

Claims (4)

The manufacturing method of the shaft for golf clubs which performs the following (1)-(6) in order.
(1) A prepreg laminate is obtained by winding a prepreg obtained by impregnating a reinforcing fiber with a thermosetting resin around a mandrel so that the large-diameter side end of the mandrel is exposed, and laminating.
(2) A tape-shaped prepreg is wound around the end portion of the obtained prepreg laminate and the exposed mandrel to form a reinforcing portion.
(3) By heating, the thermosetting resin in the prepreg and the tape-shaped prepreg is cured to obtain a golf club shaft with a reinforcing portion on the mandrel.
(4) Insert a member provided with a hole through which the large-diameter side end of the mandrel is passed but not through the reinforcing part from the large-diameter side end of the mandrel, and attach to the reinforcing part.
(5) supporting a member provided with a hole, and pulling out the mandrel from the golf club shaft;
(6) The end portion of the golf club shaft is cut so as to include the reinforcing portion. The manufacturing method of the shaft for golf clubs of Claim 1 which replaces (4) and performs the following (4 ').
(4 ') A member provided with a hole through which the mandrel's large-diameter end is passed but the reinforcing portion is not inserted is inserted from the mandrel's large-diameter end, and is attached to the large-diameter end of the reinforcing portion.   The golf club shaft manufacturing method according to claim 1, wherein the reinforcing portion has a thickness of 0.3 to 5 mm. The method for manufacturing a shaft for a golf club according to any one of claims 1 to 3, wherein the reinforcing portion has a width of 5 to 10 mm.

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