JP2008154511A - Tubular body and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a tubular body which improves the winding operation efficiency of a prepreg sheet during the production of the tubular body. <P>SOLUTION: The method for producing a tubular body, formed by winding a prepreg sheet 1 which is obtained, by impregnating a reinforcing fiber with a synthetic resin has a process for forming a slit 3 on the prepreg sheet 1, having the reinforcing fiber set in a specific direction and folding the slit to form a bent part 1A, in which the reinforcing fiber is oriented in the direction different from the specific direction and a process for winding the prepreg sheet 1 that has the bent part 1A on a cored bar M. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tubular body used for various sports equipment such as fishing equipment such as fishing rods, golf club shafts, and the like, and a manufacturing method thereof.

  Conventionally, in producing the tubular body as described above, for example, as disclosed in Patent Document 1, it is known to use a so-called prepreg sheet in which a reinforcing fiber is impregnated with a synthetic resin. Usually, such a tubular body is produced by winding a prepreg sheet around a core metal (mandrel) a predetermined number of times, then curing the synthetic resin by heating, and then removing the core.

  A plurality of the above-described prepreg sheets may be used when creating one tubular body. For example, in the configuration in which only the prepreg sheet (forming the axial length direction fiber layer) in which the reinforcing fibers are aligned in the axial length direction is wound, it is possible to improve the bending rigidity of the produced tubular body. , There is a problem that the crushing strength is reduced (breaking easily occurs). For this reason, it is performed to wind together a prepreg sheet (forming a circumferential fiber layer) in which reinforcing fibers are aligned in the circumferential direction. Such a plurality of prepreg sheets are preliminarily laminated and wound around a cored bar, or a plurality of prepreg sheets are wound around a cored bar while being connected at the end. .

Further, when a tubular body is used as a fishing rod, a reinforcing prepreg sheet may be wound around the joint portion between the rods. Such a prepreg sheet for reinforcement has a configuration that is short in the axial direction so as to be wound around a reinforced portion, separately from the prepreg sheet (main body prepreg sheet) that forms the tubule over the entire length direction. It is attached to the main body prepreg sheet in advance, or is wound in a pre-process or a post-process of winding the main body prepreg sheet to form a reinforcing layer different from the main body layer by the main body prepreg sheet. .
JP 49-35177 A

  By the way, as a tubular body, in the case of forming a configuration in which the alignment direction of the reinforcing fibers is changed, for example, when forming the axial length direction fiber layer and the circumferential direction fiber layer, as described above, the alignment direction of the reinforcing fibers with respect to the cored bar It is necessary to wind a prepreg sheet with different. That is, if an axial length direction fiber layer and a circumferential direction fiber layer are to be formed, a prepreg sheet in which reinforcing fibers are aligned in the axial length direction with respect to the core metal, and a prepreg sheet in which reinforcing fibers are aligned in the circumferential direction That is, it is necessary to wind two prepreg sheets.

  As described above, when forming layers with different reinforcing fiber alignment directions, or when forming a reinforcing layer, it is necessary to wind a plurality of prepreg sheets around the core metal, resulting in poor working efficiency. The problem will arise.

  The present invention has been made based on the above problems, and provides a tubular body capable of improving the efficiency of winding a prepreg sheet at the time of producing the tubular body, and a manufacturing method for producing such a tubular body. With the goal.

  In order to achieve the above-mentioned object, the tubular body according to the present invention is formed by winding a prepreg sheet in which a reinforcing resin is impregnated with a synthetic resin, and the reinforcing fiber is set in a specific direction. By forming a slit in a prepreg sheet and winding it in a folded state, the wound layer has a different direction fiber layer in which reinforcing fibers are oriented in a direction different from the specific direction. It is characterized by.

  In order to achieve the above-described object, the present invention provides a method for manufacturing a tubular body formed by winding a prepreg sheet in which a reinforcing resin is impregnated with a synthetic resin, wherein the reinforcing fiber is set in a specific direction. Forming a slit in a single prepreg sheet, and bending the slit to form a bent portion in which reinforcing fibers are oriented in a direction different from the specific direction, and the prepreg sheet having the bent portion as a core. And winding it around gold.

  According to the above-described configuration, the tubular body is created by winding a prepreg sheet in which a reinforcing fiber is impregnated with a synthetic resin around a cored bar, heating the prepreg sheet to cure the synthetic resin, and removing the core. In this case, one or two or more prepreg sheets constituting the tubular body are wound around the core metal a predetermined number of times, but at least one prepreg sheet has slits formed in advance. , The slit is bent. Thus, by forming a slit in the prepreg sheet and bending it, the direction of the reinforcing fiber in the bent portion becomes different from the direction of the reinforcing fiber in the unfolded portion. That is, by forming such a bent portion, it is possible to form a state in which the directions of the reinforcing fibers are different while being a single prepreg sheet, and winding this single prepreg sheet. This makes it possible to obtain a predetermined reinforcing state without winding a plurality of prepreg sheets.

  In the configuration described above, the reinforcing fibers of the prepreg sheet in which the slits are formed may be, for example, those aligned in the axial length direction, those aligned in the circumferential direction, or aligned in the bias direction. Further, the reinforcing fibers may be knitted into a nonwoven fabric or a woven fabric. Or the sheet | seat which bonded together the prepreg sheet | seat from which a fiber direction differs may be sufficient. Further, the number of turns of the prepreg sheet in which such slits are formed is not particularly limited, and even if the number of turns is different between the front end side and the rear end side of the tubular body. good. Moreover, the tubular body may be provided with a wound layer made of a prepreg sheet having a configuration other than the prepreg sheet in which slits are formed.

  ADVANTAGE OF THE INVENTION According to this invention, the tubular body which can aim at the improvement of the winding operation | work efficiency of the prepreg sheet at the time of tubular body preparation, and the manufacturing method which manufactures such a tubular body are obtained.

Hereinafter, the tubular body concerning the present invention is explained concretely according to a manufacturing method.
FIG. 1 to FIG. 3 are diagrams showing an embodiment of the present invention, and FIG. 1 (a) is a diagram showing a configuration of a prepreg sheet used when a tubular body is formed, in which slits are formed. FIG. 1B is a view showing a state where the slit portion is bent, FIG. 2 is a view showing a state where the prepreg sheet shown in FIG. 3 is a cross-sectional view after forming a tubular body along the line AA in FIG.

  As in the prior art, the tubular body 10 is made by aligning reinforcing fibers made of carbon, glass, boron, etc. in a specific direction or making it into a woven fabric (nonwoven fabric) and impregnating it with a matrix resin such as epoxy, polyester, phenol, etc. It is created by the prepreg sheet 1 formed as described above.

  The prepreg sheet 1 is cut so as to be wound at the same number of turns over the entire axial length direction (from the tip to the original side) of the core metal M, and is a tubular body extending in the axial length direction. Configure the body to form. In this embodiment, the reinforcing fibers F constituting the prepreg sheet are aligned in the axial length direction and are cut so that three plies can be formed from the front end side to the rear end side.

  And with respect to the prepreg sheet 1 cut in this way, a slit 3 is formed in a part thereof, specifically, a base end side in a direction orthogonal to the alignment direction of the reinforcing fibers F, and the slit 3 Bending is performed along a line L indicated by a dotted line with the end portion P as a base point. The line L is set so that the direction of the reinforcing fiber F ′ of the bent portion 1A is a desired direction when bent at the slit 3 (the line L shown in the figure is the bent portion 1A). The direction of the reinforcing fiber F ′ is set to be a direction orthogonal to the reinforcing fiber F).

  And, as described above, the prepreg sheet 1 in which the bent part 1A is formed by bending is wound around the core metal M and taped, and then a heating process (matrix resin curing), a decentering process, A predetermined tubular body is formed through a polishing process or the like.

  In this way, the direction of the reinforcing fiber F ′ of the bent portion 1A is bent by forming the slit 3 in the prepreg sheet 1 in advance and bending it without winding a plurality of prepreg sheets (reinforcing prepreg sheets). It will be in a different state (circumferential direction with respect to the axial length direction) with respect to the direction of the reinforcing fiber F in the part that is not formed. That is, by forming the bent portion 1A before the winding process of the core metal M, it is possible to reinforce with the circumferential fiber F ′ at the same time while being a single prepreg sheet, and work efficiency is improved. Can be improved. As shown in FIG. 3, on the proximal end side of the produced tubular body, in addition to the axial length direction fiber layer 11, a circumferential direction fiber layer (set in a direction different from the directing direction of the reinforcing fibers of the axial length direction fiber layer) The different direction fiber layer) 12 is formed.

  In addition, when the above-mentioned slit 3 winds the prepreg sheet | seat 1 around the core metal M, it is preferable to form in edge parts other than the starting edge part E1 used as the winding start side. That is, if the slit 3 is formed in the region of the starting end E1 and bent, the length of the prepreg sheet in the axial length direction is increased from the middle during winding, and wrinkles are likely to occur. For this reason, it is preferable to form the slit 3 at an end portion (front and rear end portion E2, end portion E3) other than the start end portion E1 of the prepreg sheet 1. Further, the line L to be bent can be appropriately modified according to the characteristic to be reinforced.

  For example, FIGS. 4A and 4B are diagrams illustrating an example in which the formation position and the bending position of the slit 3 of the prepreg sheet wound around the core metal M are modified. In the example shown in FIG. 4A, although the slit 3 is formed at the same position as the example shown in FIG. 1, the fiber direction F ′ of the bent portion 1A is set to the bias direction by changing the bending direction. Yes. Alternatively, as shown in FIG. 4B, the fiber direction F ′ of the bent portion 1A can be set to the bias direction by forming the slit 3 in the rear end portion E2. Furthermore, by winding the two prepreg sheets shown in FIGS. 4A and 4B around the core metal M, it is possible to set the fiber direction to intersect the bias direction.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to above-described embodiment, A various deformation | transformation is possible. For example, the position, length, and number of slits formed in the prepreg sheet can be appropriately changed according to the required characteristics of the tubular body.

It is a figure which shows one Embodiment of this invention, (a) is a figure which shows the structure of the prepreg sheet | seat used when shape | molding a tubular body, Comprising: The figure which shows the state which formed the slit, (b) is The figure which shows the state bent by the formed slit part. The figure which shows the state which winds the prepreg sheet | seat shown in FIG.1 (b) around a metal core. Sectional drawing after the tubular body shaping | molding along the AA of FIG. (A) And (b) is a figure which shows the example which each changed the formation position and bending position of the slit of the prepreg sheet wound around a metal core.

Explanation of symbols

1 Prepreg Sheet 1A Bent Part 3 Slit 10 Tubular Body M Core

Claims (3)

In a tubular body formed by winding a prepreg sheet impregnated with a synthetic resin in a reinforcing fiber,
Reinforcing fibers are formed in a direction different from the specific direction in the wound layer by forming slits in one prepreg sheet in which the reinforcing fibers are set in a specific direction and winding the slits in a folded state. A tubular body characterized in that it has a different-direction fiber layer oriented to the surface. In the method of manufacturing a tubular body formed by winding a prepreg sheet impregnated with a synthetic resin in a reinforcing fiber,
Forming a slit in one prepreg sheet in which the reinforcing fiber is set in a specific direction, and bending the same to form a bent portion in which the reinforcing fiber is oriented in a direction different from the specific direction;
Winding a prepreg sheet having the bent portion around a cored bar,
A method for producing a tubular body, comprising: The method for producing a tubular body according to claim 2, wherein the slit is formed at an end portion other than a start end portion which becomes a winding start side when the prepreg sheet is wound around the core metal.

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