JP5843087B2 - Golf club shaft - Google Patents

Description

  The present invention relates to a golf club shaft including a metal sheet layer.

  2. Description of the Related Art Conventionally, in golf club shafts, it is known to perform metal plating on the outer periphery of the shaft, or to dispose metal fibers and metal foils for the purpose of improving the design of the appearance of the shaft (Patent Document 1). ). In addition, it is known to improve adhesion by plating and vapor-depositing metal on one side of a fabric woven with inorganic fibers for the purpose of improving adhesion to the shaft such as metal plating (Patent Document). 2). Furthermore, a golf club shaft using a prepreg in which a metal foil is laminated on one side of a carbon fiber reinforced resin layer is known for the purpose of improving not only the design properties but also the mechanical strength of the shaft (patent) Reference 3).

  As described above, it has been conventionally known to manufacture a golf club shaft using a metal foil or a composite material therefor for the purpose of improving design properties, mechanical strength, and the like. In recent years, golf club shafts are often given a complicated pattern from the viewpoint of design.

Japanese Utility Model Publication No. 50-88050 Japanese Patent Laid-Open No. 2-98376 Japanese Patent Laid-Open No. 6-198808

If a complicated pattern or the like is to be formed by, for example, painting, the painting process becomes complicated and the pattern cannot be easily formed. In the case of forming a pattern with a metal foil or the like, the adjustment of the perforated metal foil by punching, which has been widely used in the past, restricts the entire pattern due to the combination of the hole shapes, the minimum hole diameter, and the like. Further, if the hole formation is performed by punching as described in Patent Document 3, the edge portion of the hole is roughened, and a portion protruding slightly from the surface of the metal foil is generated. If such a protruding portion is generated, the surface may be roughened when coating or thermal transfer coating is performed on the upper surface of the metal foil in a later step. In addition, fine bubbles generated during coating may be trapped at the edge portion, resulting in roughening, and design properties may be further reduced. In addition, for the purpose of improving mechanical properties, if a golf club shaft is created in a state in which voids such as air bubbles are captured, mechanical properties are deteriorated and peeling between carbon fiber reinforced resin layers is prevented. May occur.
An object of the present invention is to achieve both improvement in design properties and mechanical properties that solve the above problems in a golf club shaft.

  As a result of intensive studies in view of the above problems, the present inventors have found that the above problems can be solved by the following invention, and have completed the present invention. That is, this invention is the following golf club shafts.

[1] Ke metal sheet layer voids are formed by Mika Le etching arranged carbon fiber reinforced resin layer, a further transparent resin layer is disposed as an outermost layer adjacent to the metal sheet layer, a golf club shaft Manufacturing method .
[2] A method for producing a golf club shaft , wherein the transparent resin layer is a glass fiber reinforced resin layer.
[3] The method for producing a golf club shaft, wherein the metal sheet layer includes a glass fiber woven fabric.
[4] the basis weight of the glass fiber woven fabric, the manufacturing method of the golf club shaft is a ^{10g / m 2 ~40g / m 2} .

  According to the present invention, since the pattern formed on the metal sheet can be designed precisely, variations in the pattern are widened. In addition, since the edges of the formed pattern are not roughened or protruded, bubbles are not left by subsequent processing such as coating, resulting in a smooth finish and excellent design that does not cause appearance defects such as peeling. A golf club shaft can be provided. Furthermore, since the metal sheet can be disposed at an arbitrary position, it is possible to provide a golf club shaft excellent in design and mechanical characteristics.

It is the figure which showed an example of the metal sheet used by this invention.

Hereinafter, the present invention will be described in detail. The present invention places "a metal sheet layer voids are formed by the Chemical etching arranged carbon fiber reinforced resin layer, further a transparent resin layer as an outermost layer adjacent to the metal sheet layer, Golf A manufacturing method of a club shaft. "

The golf club shaft of the present invention is manufactured by laminating a plurality of carbon fiber reinforced resin layers. Here, the “carbon fiber reinforced resin layer” is obtained by carbonizing a polyacrylonitrile fiber sheet to obtain a polyacrylonitrile carbon fiber, and then impregnating the obtained carbon fiber sheet with a resin. Or it is a carbon fiber reinforced resin sheet obtained by heating after impregnation. Specifically, a prepreg obtained by impregnating a resin in a sheet-like material on which carbon fibers are arranged can be given. A golf club shaft is manufactured from such a carbon fiber reinforced resin layer by, for example, a method described in JP-A-6-198808. Hereinafter, the manufacturing process will be briefly described.

  In recent years, golf club shafts are composed of a plurality of carbon fiber reinforced composite resin layers using carbon fibers as reinforcing fibers because they are lightweight and have high mechanical strength, and are cut into a predetermined shape and size. Is wound around a predetermined number of mandrels and cured. At this time, in order to improve the twisting and bending performance, the carbon fiber reinforced prepreg is such that the carbon fibers are inclined in the opposite directions with respect to the axis of the golf club shaft by an angle θ (usually θ = 35 ° to 45 °). Prepregs (angle layer) arranged in such a way as to be used, and prepregs (straight layer) in which carbon fibers are arranged parallel to the axis of the golf club shaft (θ = 0 °) are basically used. A golf club shaft is manufactured by using a prepreg (angle layer) for the inner layer of the golf club shaft and a prepreg (straight layer) for the outer layer.

In the present invention, at least one layer or a part of the plurality of laminated structures is a metal sheet layer. Here, the “metal sheet layer” is a layer including a sheet material in which continuous or non-continuous pores are formed by chemical etching. The sheet material is formed with a pattern or perforation mainly based on the design of a stainless steel foil material. Various manufacturing methods are known. For example, by coating or transferring a foil with a masking agent (in the case of a dry film), exposure is performed through an original plate on which a desired pattern is formed, and development is performed. Transfer the pattern onto the foil. Next, after development, the pattern is washed out and washed, and the non-exposed portion where the foil base is seen is corroded with an etching agent and drilled to form an arbitrary shape. Depending on the material, there is also known a method of flowing the exposed portion. In the present invention, the etching method is not limited.

  Chemical etching is a precision processing technique that is chemically used for printed circuit boards, EMI shield sheets, photoscales, and the like. Other methods for forming continuous or non-continuous perforations or patterns in metal sheets include processing by punching with a press die and expanded metal, but as mentioned above, chemical etching is performed in terms of pattern precision and the like. It is preferable to adopt.

  As the metal for the sheet, not only pure metals such as iron, copper, nickel, aluminum, gold and silver but also alloy materials such as stainless steel materials can be used. Of these, stainless steel materials are preferably used in terms of chemical management during the etching process and non-oxidation of the material surface after processing. The pattern to be formed on the sheet can be arbitrarily selected, but it is easy to manage the depth direction of etching, for example, by using chemical etching. Is possible.

  The position where it is arranged varies depending on the purpose of arranging the metal sheet layer. For example, with respect to the shaft axis direction of the golf club, the golf club shaft is appropriately disposed at an arbitrary position according to the concept of the golf club shaft for the purpose of adjusting the balance of the golf club shaft (weight control). As a structure of the metal sheet layer at this time, it is preferable to use a material prepared from a material having an optimum specific gravity according to a target weight distribution.

  Further, for the purpose of reinforcing effect, it is disposed at an arbitrary position necessary for compressive strength, impact strength, torsion breaking strength and the like. With respect to the shaft cross-sectional direction of the golf club, it is disposed on the inner side (second layer counted from the outermost layer) adjacent to the glass fiber reinforced resin layer which is a transparent resin layer disposed in the outermost layer for the purpose of design. Further, for the purpose of creating a feeling difference which is a characteristic of the golf club shaft, the golf club shaft is arranged in the intermediate layer or the innermost layer.

The metal sheet layer may include a glass fiber woven fabric for the purpose of improving handling properties, adhesion, and workability. Specifically, it is a metal sheet layer formed by impregnating at least one fiber-reinforced resin layer using glass fiber woven fabric as reinforcing fibers. Use of such a sheet layer is preferable in terms of adhesion to the carbon fiber reinforced resin layer. Glass fiber woven fabric basis weight is ^{10g / m 2 ~40g / m 2} , preferably ^{20g / m 2 ~30g / m 2} . If it is 40 g / m ² or less, there will be no effect on the uneven thickness and rigidity of the cross section due to the increased thickness of the metal sheet layer, and if it is 10 g / m ² or more, the material is easy to handle and work. Also, the influence on the metal sheet due to polishing is reduced.
Hereinafter, the present invention will be described specifically by way of examples. However, the present invention is not limited to the examples.

[Example 1]
The following commercially available prepregs A to F manufactured by Mitsubishi Rayon Co., Ltd. are each cut, and a small diameter tip to a position 80 mm from the small diameter tip on the mandrel, and a large diameter tip to the large diameter tip. In the entire region except for the position of 230 mm from the part, the wrapping layer for the tip reinforcing layer having the orientation angle of the reinforcing fiber of 0 ° and the angle layer for the angle layer is obtained by the procedure described in the following steps (1) to (3). A winding layer and a winding layer for a straight layer were formed.
<Prepreg>
Prepreg A: TR350E100R
Prepreg B: HSX350C100S
Prepreg C: MRX350C075R
Prepreg D: MRX350C150S
Prepreg E: Metal sheet layer prepreg F: GE352G135S

The prepreg E is a metal sheet layer, and is a composite integrated material in which a glass fiber woven fabric is impregnated on both surfaces of a stainless material having a thickness of 20 μm subjected to a chemical etching process. More specifically, a metal sheet in which WPA03 104EGE (fiber basis weight: 25 g / m ² , resin amount: 59%) manufactured by Mitsubishi Rayon Co., Ltd., which is a glass fiber fabric prepreg, is bonded to both sides of the metal sheet and integrated. It is a prepreg. About a metal sheet, the pattern is shown in FIG.
<Mandrel shape>

The outer diameter of the thin tip is 4.15 mm, the outer diameter of the thick tip is 13.80 mm, the length is 1500 mm, and the portion from the large diameter tip to the 500 mm from the large diameter tip is a parallel portion having an outer diameter of 13.80 mm. The taper portion has a taper degree of 8.79 / 1000 from the position of 500 mm from the tip end of the large diameter to the tip end of the narrow diameter of 8.79 / 1000, and further the taper part has a taper degree of 17.50 / 1000 in the range of 100 mm on the tip side. Has a taper of 8.75 / 1000 up to the tip of the small diameter.
<Step 1>

When the prepreg A is wound around the mandrel so that the fiber direction is 0 ° with respect to the radial center line of the mandrel, the narrow end (= 80 mm position from the narrow end of the mandrel) to the It becomes four layers over the length from the end on the small diameter side to 120mm, and after that, it is gradually reduced and cut into a substantially trapezoidal shape so that there is no winding at the position 220mm from the end on the small diameter side. Wrapped around the tip reinforcing layer with the reinforcing fiber orientation angle of 0 °.
<Step 2>

When the prepreg B is wound on the winding layer for the tip reinforcing layer formed in (1) so that the fiber method is + 45 ° with respect to the radial center line of the mandrel, The prepreg B was cut so as to be wound with a 4.65 layer at the end on the small diameter side and a 2.63 layer at the end on the large diameter side, and the fiber direction was −45 ° with respect to the radial center line of the mandrel. When wound on the winding layer for the tip reinforcing layer formed in (1) in the same manner, it is wound with 4.65 layers at the small diameter end and 2.63 layers at the large diameter end. After cutting the two prepregs so that the fiber directions thereof are orthogonal to each other, the bonded prepreg is bonded to the winding layer for the tip reinforcing layer formed in (1). Wrap on the top and roll for the angle layer It became.
<Step 3>

  When the prepregs C and D are wound on the winding layer for the angle layer formed in step 2 so that the fiber direction is 0 ° with respect to the radial center line of the mandrel, the prepreg C is thin. Cut one layer from the diameter side end to the large diameter side end, and the prepreg D is cut into a substantially trapezoidal shape that wraps in two layers from the small diameter side end to the large diameter side end. These two prepregs were wound on the winding layer for the angle layer formed in the step 2 in the order of the prepreg C and the prepreg D, and the winding for the straight layer was performed.

Next, a metal sheet layer, a third reinforcing layer, and a winding layer for the first reinforcing layer, an etching process for the second reinforcing layer, and the like, respectively, in predetermined regions by the procedure described in the following steps 4 to 8 A winding layer for use and a winding layer for the fourth reinforcing layer were formed by sequentially winding.
<Step 4>

When the prepreg C is wound on the winding layer for the straight layer formed in step 3 so that the fiber direction is 0 ° with respect to the radial center line of the mandrel, the narrow-diameter side end portion ~ It becomes one layer over the length from the end on the small diameter side to 650 mm, and then gradually decreases to eliminate winding at a position 700 mm from the end on the small diameter side. It cut | judged into the substantially trapezoid which winds from the diameter side edge part to the position of 700 mm, wound on the winding layer for straight layers formed in the process 3, and wound for the 1st reinforcement layer.
<Step 5>

When prepreg E formed by impregnating both front and back surfaces with a fiber reinforced resin layer made of glass fiber woven fabric as a reinforcing fiber is wound following the procedure of step 4, zero layer is positioned at a position of 650 mm from the end on the small diameter side, After that, the winding gradually increases, becoming one layer at a position 700mm from the end on the small diameter side, one layer over the length from the end on the small diameter side to 850mm, and then gradually decreasing the winding. In the step 3, the winding is eliminated at a position of 900 mm from the end on the small diameter side, that is, it is cut into a substantially trapezoidal shape that winds from 650 mm from the end on the small diameter side to the position of 900 mm from the end on the small diameter side. The metal sheet layer which was wound on the winding layer for the straight layer formed in this manner and subjected to the etching treatment for the second reinforcing layer was wound. As the metal sheet layer of the prepreg E, a glass fiber woven fabric bonded to both front and back surfaces was used in order to improve the adhesion with other reinforcing fibers. In winding, in order to prevent unevenness of the shaft, winding was performed so as to match the winding end of the winding layer for the first reinforcing layer formed in step 4.
<Step 6>

When the prepreg C is wound following the procedure of step 5 with the fiber direction being 0 ° with respect to the radial center line of the mandrel, the prepreg C is wound at 850 mm from the end on the small diameter side, and then wound. Gradually increases, becomes one layer at a position 900 mm from the end on the small diameter side, and wraps one layer over the length to the end on the large diameter side, that is, from 850 mm to the large diameter side end from the small diameter side end It was cut into a substantially trapezoidal shape so as to be wound up to the position of the part, wound on the winding layer for the straight layer formed in step 3, and wound for the third reinforcing layer. In winding, in order to prevent the unevenness of the shaft, the winding was performed so as to coincide with the winding end of the winding layer for the second reinforcing layer formed in Step 5.
<Step 7>

When the prepreg F, which is a glass fiber reinforced resin layer, is wound following the procedure of step 6 so that the fiber direction is 0 ° with respect to the radial center line of the mandrel, the prepreg F is 1 at the small diameter side end. Layer, cut and wound so as to be wound as one layer at the large diameter end, that is, cut so as to be wound over the length from the small diameter end to the large diameter end, It wound on the winding layer for the 1st-3rd reinforcement layer formed in the process 4-the process 6, and the prepreg F was wound. The prepreg F plays a role as a polishing layer for causing the prepreg E formed in the step 5 to float on the shaft surface.
<Step 8>

  The prepreg A is cut into a right triangle whose fiber direction is the same direction as one of two sides sandwiching a right angle and whose length is 120 mm × 115 mm, and the fiber direction is a mandrel. The winding layer of the prepreg F formed in step 7 so that it is 0 ° with respect to the radial center line and is wound most multiplexedly at the end on the small diameter side, and then gradually disappears. The fourth reinforcing layer was wound around.

  After that, after winding the wrapping tape made of polypropylene, heat curing in a curing furnace, removal from the mandrel, removal of the wrapping tape, polishing of the outer peripheral surface, and 10 mm from the end of the small diameter side and Trimming cut and coating of 10 mm from the end on the large diameter side gave a golf club shaft for a driver.

When the surface using the prepreg E was observed in a state completed as a golf club shaft, the edge portion of the formed pattern was not roughened or protruded, so there was no air bubbles left by the coating process, and the finish was smooth and peeled off. Thus, it was possible to produce a golf club shaft excellent in design without causing a poor appearance.
[Comparative Example 1]
A golf club shaft having a configuration corresponding to that of the example was obtained except that the prepreg E material in the golf shaft of Example 1 was changed to a punched stainless steel material having a thickness of 30 μm.

In the prepreg E used for this golf club shaft, etching of the hole end of an arbitrary shape occurred at the material processing stage, and irregularities were generated when the glass fiber woven fabric was impregnated. Further, when the surface using the prepreg E was observed in a state completed as a golf club shaft, fine bubbles were generated due to the thickness and unevenness of the material, and the appearance was poor.
[Comparative Example 2]
Except for changing the material of the prepreg E in the golf shaft of Example 1 to a stainless material having a thickness of 30 μm subjected to expanded metal, a golf club shaft having a configuration corresponding to that of the example was obtained.

  The prepreg E used for this golf club shaft is formed by forming a notch (slit) and extending in a direction perpendicular to the notch. However, cracks are generated between the notches at the material processing stage. Unevenness occurred when the glass fiber woven fabric was impregnated by cracks. Further, when the surface using the prepreg E was observed in a state completed as a golf club shaft, fine bubbles were generated due to the thickness and unevenness of the material, and the appearance was poor.

Claims (4)

The metal sheet layer voids are formed by the Chemical etching arranged carbon fiber reinforced resin layer, a further transparent resin layer is disposed as an outermost layer adjacent to the metal sheet layer, the manufacturing method of the golf club shaft . The golf club shaft manufacturing method according to claim 1, wherein the transparent resin layer is a glass fiber reinforced resin layer. The golf club shaft manufacturing method according to claim 1, wherein the metal sheet layer includes a glass fiber woven fabric. The basis weight of the glass fiber woven fabric is a ^{10g / m 2 ~40g / m 2} , claim 3 golf club shaft manufacturing method described.

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