JP2010136908A - Method of manufacturing golf club shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a golf club shaft capable of improving the productivity and the quality by hardening a laminated body and facilitating polishing a braided layer, an object to be polished, in just proportion when using a braiding process. <P>SOLUTION: In this method of manufacturing the shaft, when base material fibers 3 impregnated with a resin material are braided on the periphery of a mandrel at a predetermined orientation angle with respect to a mandrel shaft direction and tapered cylindrical braided layers are sequentially superposed to form a tapered cylindrical laminated body 2, at least when the outermost peripheral third braided layer 2c is formed, the base material fibers 3 are braided by increasingly changing the orientation angle on the axial rear end side more than that of the axial end side, with defining the orientation angle a1 smaller than the orientation angle a2, and, after the formed laminated body 2 is heated and hardened, the surface of the laminated body 2 is polished at a fixed thickness. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a shaft for a golf club, and more particularly, when a braided manufacturing method is used, a braided layer to be polished is easily polished without excess or deficiency after the laminate is cured, and is produced. The present invention relates to a method for manufacturing a golf club shaft capable of improving the performance and quality.

  As a method for manufacturing a golf club shaft, a braiding method is known (see, for example, Patent Document 1). In the braiding method, a base fiber impregnated with a resin material on a mandrel is braided at a symmetrical orientation angle with respect to the mandrel axial direction to form a braided layer, and a plurality of the braided layers are laminated to form a tapered cylindrical shape. A laminate is formed. Thereafter, the laminate is heated to cure the resin material impregnated in the base fiber. Since the surface of the cured laminate becomes uneven due to the influence of the braided base fiber, the surface of the cured laminate is polished to smooth the unevenness.

  Conventionally, in the braiding method, as illustrated in FIGS. 8 and 9, when forming each of the braided layers (the first braided layer 2 a, the second braided layer 2 b, and the third braided layer 2 c) to be laminated, The fiber 3 is braided with a constant orientation angle a without changing the axial position. Therefore, in the small diameter range on the tip end side in the axial direction of the formed tapered cylindrical laminate 2, the cross-sectional area of the base fiber 3 with respect to the outer peripheral length of the laminate 2 as shown in FIG. Since the sum of the cross-sectional areas of the fibers 3) increases, the adjacent base fibers 3 are compressed and the layer thickness t1 tends to increase. On the other hand, in the large diameter range on the rear end side in the axial direction of the laminated body 2, as shown in FIG. Since the sum of the cross-sectional areas of the base fibers 3 becomes smaller, the layer thickness t2 tends to become smaller. That is, as illustrated in FIG. 9, in each braided layer 2 a, 2 b, 2 c, the layer thickness is larger at the axial front end than at the rear end. Regarding the third braided layer 2c, the layer thickness t1> the layer thickness t2.

  Since the surface of the cured laminate 2 is generally polished with a constant thickness in the axial direction of the laminate 2 using a rotating abrasive body, the outermost third braid layer 2c to be polished is used. When polishing is performed, an unpolished portion of the third braided layer 2c is generated in the range on the tip side in the axial direction. If there is a part of the polishing residue in the axial direction of the laminate 2 or if the thickness of the polishing residue varies, the quality (performance) of the manufactured shaft is adversely affected.

Therefore, it is necessary to perform additional polishing work in order to eliminate this polishing residue or to eliminate variations in the thickness of the polishing residue. Thus, in order to maintain and improve the quality of the shaft, additional polishing work is performed, so there is a limit to improving productivity.
JP 2002-177424 A

  An object of the present invention is to improve productivity and quality by making it easy to polish a braided layer to be polished without excess or deficiency after curing a laminate when using a braiding method. It is in providing the manufacturing method of the shaft for clubs.

  In order to achieve the above object, the golf club shaft manufacturing method of the present invention sequentially braces base fibers impregnated with a resin material at a predetermined orientation angle with respect to the mandrel axial direction on the mandrel outer periphery. A tapered cylindrical braided layer is laminated to form a tapered cylindrical laminate, and the laminate is heated to cure the resin material impregnated in the base fiber, and then the surface of the cured laminate In the method for manufacturing a golf club shaft for polishing a golf club shaft, when forming at least the outermost outermost braided layer of the laminated braided layers, the rear end side is larger than the front end side in the axial direction. It is characterized by braiding the base fiber by changing.

  Here, the difference between the maximum layer thickness and the minimum layer thickness of the braided layer formed by changing the orientation angle is set to 0.1 mm or less, for example. Moreover, the range which changes the said orientation angle shall be 10 degrees-70 degrees, for example. The cured laminate is, for example, passed between rotating abrasive bodies to polish the surface to a certain thickness.

  According to the present invention, the base fiber impregnated with the resin material is braided on the outer periphery of the mandrel at a predetermined orientation angle with respect to the mandrel axial direction, so that the tapered cylindrical braided layer is sequentially laminated. In the method for manufacturing a golf club shaft, the resin material impregnated in the base fiber is cured by heating the laminate, and then the surface of the cured laminate is polished. Among the laminated braided layers, when forming at least the outermost braided layer, the base fiber is braided by changing the orientation angle so that the rear end side is larger than the axial front end side. In the braided layer with the angle changed, the difference in layer thickness due to the difference in the axial position of the tapered cylindrical laminate can be reduced. As a result, if the braided layer to be polished (mainly the outermost braided layer) is polished to a certain thickness after the laminate is cured, the braided layer can be polished without excess or deficiency as set. Become. That is, since it is possible to avoid unnecessarily polishing the surface of the laminate over the entire length in the axial direction and causing unnecessarily unpolished residues, productivity and quality can be improved.

  A golf club shaft manufacturing method of the present invention will be described based on the embodiment shown in the drawings.

  When manufacturing a golf club shaft (hereinafter referred to as shaft 1) according to the present invention, a general braiding device 6 as illustrated in FIG. 5 is used. This braiding device 6 has a configuration in which a plurality of bobbins 7 wound with base fibers 3 are installed on a rotating base 6a, and a tapered cylindrical or columnar mandrel 5 is inserted through the center of the rotating base 6a. Yes. The base fiber 3 is impregnated with a resin material.

  Examples of the base fiber 3 include carbon fiber, aramid fiber, metal fiber, glass fiber, and boron fiber. As a resin material to be impregnated into the base fiber 3, a thermosetting resin such as an epoxy resin or an unsaturated polyester resin is used.

  The base fiber 3 is pulled out from each bobbin 7 by rotating the mandrel 5 around the mandrel 5 while moving the mandrel 5 in the axial direction and inserting the mandrel 5 through the rotation base 6a. As a result, the base fiber 3 is braided on the outer periphery of the mandrel 5 at a predetermined orientation angle a symmetrically with respect to the axial direction of the mandrel 5 (axis CL of the mandrel 5), and the tapered first cylindrical braided layer 2a. Is formed. Similarly, the second braided layer 2b on the outer periphery of the first braided layer 2a, the third braided layer 3c in the same manner on the outer periphery of the second braided layer 2b, and the axial center CL of the mandrel 5 (that is, the laminate 2 to be molded). Are laminated in order on the same axis around the axis CL) to form a tapered cylindrical laminate 2.

  Here, for example, when forming the first braided layer 2 a and the second braided layer 2 b, the orientation angle a of the base fiber 3 is set to a constant angle in the axial direction of the mandrel 5. Then, when forming the outermost third braided layer 2 c of the laminate 2, the orientation angle a of the base fiber 3 is changed so that the rear end side is larger than the axial front end side of the mandrel 5. To do.

  In order to change the orientation angle a of the base fiber 3 of the third braided layer 2c, it is easily changed by changing the axial feed speed of the mandrel 5 while keeping the rotation speed of the rotation base 6a constant. be able to. For example, when the orientation angle a is increased, the axial feed rate of the mandrel 5 is decreased, and when the orientation angle a is decreased, the axial feed rate of the mandrel 5 is increased.

  Thus, as illustrated in FIG. 1, a tapered cylindrical laminate in which the orientation angle a of the base fiber 3 of the third outermost braided layer 2c is changed so that the rear end side is larger than the axial front end side. The body 2 can be molded. In the laminated body 2, the orientation angle a2 on the rear end side is larger than the orientation angle a1 on the front end side (a1 <a2).

  Here, the relationship between the layer thickness of the 1st braided layer 2a, the 2nd braided layer 2b, and the 3rd braided layer 2c of the laminated body 2 and the orientation angle a of the base fiber 3 is as follows. In the cross section of the laminate 2 (cross section perpendicular to the axis CL), the cross-sectional area of the base fiber 3 decreases as the orientation angle a of the base fiber 3 decreases. And the arrangement | positioning number of the base fiber 3 in the cross-sectional position of the laminated body 2 is constant irrespective of the orientation angle a. Therefore, the smaller the orientation angle a of the base fiber 3 is, the smaller the sum of the cross-sectional areas of the base fiber 3 at the cross-sectional position is, so that an increase in the layer thickness can be suppressed. In other words, as the orientation angle “a” of the base fiber 3 is increased, the sum of the cross-sectional areas of the base fiber 3 at the cross-sectional position is increased, so that the layer thickness is inevitably increased.

  In the present invention, since the orientation angle a of the base fiber 3 is smaller on the front end side of the laminate 2 than on the rear end side, the third braided layer 2c on the front end side of the laminate 2 is illustrated in FIG. Thus, the layer thickness is t, and the third braided layer 2c on the rear end side of the laminate 2 has the layer thickness t as illustrated in FIG.

  When this laminated body 2 is viewed in a longitudinal section, as illustrated in FIG. 2, the first braided layer 2 a and the second braided layer 2 b each have a constant orientation angle a of the base fiber 3. The tip side is larger than the rear end side. On the other hand, since the third braided layer 2c gradually changes the orientation angle a in the axial direction to increase the rear end side, the change in the layer thickness due to the axial position is small, and the layer thickness t is substantially constant. It has become.

  The formed tapered cylindrical laminate 2 is heated to cure the resin material impregnated in the base fiber 3. The cured laminate 2 obtained in this manner is uneven due to the influence of the base fiber 3 whose surface is braided.

  Therefore, next, the surface of the cured laminate 2 is polished by the polishing apparatus 8 illustrated in FIG. 6 so as to remove substantially all of the third braided layer 2c. The polishing apparatus 8 has a pair of polishing bodies 8a and 8a facing each other with the rotation axis in parallel. By passing the laminate 2 between the rotating pair of cylindrical polishing bodies 8a, 8a, the entire surface is polished to a certain thickness.

  As described above, since the layer thickness of the third braided layer 2c to be polished of the laminate 2 is substantially constant regardless of the axial position, the third braided layer 2c is passed between the rotating polishing bodies 8a and 8a. When the surface is polished to a certain thickness, there is no polishing residue of the third braided layer 2c, or the variation in the thickness of the polishing residue can be reduced. Therefore, it is not necessary to perform additional significant polishing work, which contributes to the improvement of productivity. After the polishing by the polishing apparatus 8, fine adjustment is performed to finally finish the surface of the laminate 2 smoothly.

  Then, the surface of the smoothed laminate 2 is painted, and the shaft 1 having the paint layer 4 on the surface as illustrated in FIG. 7 is completed. In this shaft 1, only the outermost third braided layer 2c of the laminated body 2 is substantially removed and there is almost no polishing residue, so the quality (performance) of the manufactured shaft 1 Will not be adversely affected.

  Thus, according to the present invention, it becomes easy to polish the third braided layer 2c to be polished without excess or deficiency as set, and the surface of the cured laminate 2 is polished more than necessary over the entire axial length. Therefore, it is possible to avoid the occurrence of polishing residue more than necessary, so that productivity and quality can be improved.

  In order to easily polish the third braided layer 2c to be polished without excess or deficiency, the difference between the maximum layer thickness and the minimum layer thickness of the third braided layer 2c is preferably as small as possible, 0.1 mm or less, Particularly preferably, it is 0.05 mm or less.

  The range in which the orientation angle a of the base fiber 3 is changed is, for example, about 10 ° to 70 °, or about 20 ° to 60 °. The orientation angle “a” is not only changed uniformly, but also according to the taper degree (change degree of the outer diameter in the axial direction) of the laminate 2 to be molded so as to make the layer thickness of the third braided layer 2c as uniform as possible. To change.

  The orientation angle a of the base fiber 3 may be changed in the braided layer to be polished, specifically, at least the third outermost braided layer 2c, but the other braided layer 2a. The orientation angle a of the base fiber 3 of 2b may be changed similarly.

  In the above embodiment, the laminated body 2 is formed by laminating three layers of the first braided layer 2a, the second braided layer 2b, and the third braided layer 2c. Is set. For example, about 4, 5, or 6 braided layers can be laminated. When the laminated body 2 is formed by laminating five braided layers, at least the outermost fifth braided layer is an object to be polished. Moreover, an appropriate number is set also about the number of the base fiber 3 in each braided layer.

It is a top view which illustrates the tapered cylindrical laminated body formed by this invention. It is AA sectional drawing of FIG. It is a BB half sectional view of Drawing 2 showing the state of the substrate fiber of the 3rd braiding layer typically. It is CC sectional view taken on the line in FIG. 2 schematically showing the state of the base fiber of the third braided layer. It is explanatory drawing which illustrates the process of braiding a base fiber. It is explanatory drawing which illustrates the process of grind | polishing the surface of the laminated body hardened | cured. FIG. 3 is a longitudinal sectional view illustrating a shaft completed by forming a paint layer after polishing the third braided layer of FIG. 2. It is a top view which illustrates the tapered cylindrical laminated body formed by making the orientation angle of a base fiber constant. It is DD sectional drawing of FIG. FIG. 10 is a half cross-sectional view taken along the line E-E in FIG. 9 schematically showing the state of the base fiber of the third braided layer. FIG. 10 is a FF half cross-sectional view of FIG. 9 schematically showing the state of the base fiber of the third braided layer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft 2 Laminated body 2a 1st braided layer 2b 2nd braided layer 2c 3rd braided layer 3 Base fiber 4 Paint layer 5 Mandrel 6 Braiding device 6a Rotating base 7 Bobbin 8 Polishing device 8a Polishing body

Claims (4)

  The base fiber impregnated with the resin material is braided on the outer periphery of the mandrel at a predetermined orientation angle with respect to the mandrel axial direction, and then a tapered cylindrical braided layer is laminated to form a tapered cylindrical laminate. In the method for manufacturing a golf club shaft, the resin material impregnated in the base fiber is cured by heating the laminate, and then the surface of the cured laminate is polished. Of these, when forming at least the outermost braided layer, the golf club shaft is produced by braiding the base fiber by changing the orientation angle so that the rear end side is larger than the front end side in the axial direction.   The golf club shaft manufacturing method according to claim 1, wherein a difference between the maximum layer thickness and the minimum layer thickness of the braided layer formed by changing the orientation angle is 0.1 mm or less.   The golf club shaft manufacturing method according to claim 1, wherein a range in which the orientation angle is changed is set to 10 ° to 70 °.   The method for producing a shaft for a golf club according to any one of claims 1 to 3, wherein the cured laminate is passed through a rotating abrasive body to polish the surface to a certain thickness.

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