JP2003056536A - Fiber-reinforced synthetic resin bolt and nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber-reinforced synthetic resin bolt and nut, having a high tensile force resistance and high fracture strength in a screw thread. SOLUTION: This fiber-reinforced synthetic resin bolt is formed with multiple vertical fibers 2 being disposed approximately parallel to one another in the axial direction of a bolt 1, and lateral fibers 4 are disposed in plane approximately perpendicular to the bolt axis. This fiber-reinforced synthetic resin nut is formed that the fibers are disposed in a screw thread part, in a plane which is approximately perpendicular with respect to the bolt axis to be assembled in the nut.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber reinforced synthetic resin bolt and nut.

[0002]

2. Description of the Related Art As shown in FIG. 7, a conventional fiber-reinforced synthetic resin bolt is made of glass fiber, carbon fiber, etc.
(Hereinafter simply referred to as fibers) 31 are aligned and aligned in the axial direction of the bolts to form a bundle, and the bundled fibers are impregnated with liquid epoxy resin, unsaturated polyester resin, or the like and heat-cured into a rod shape. After that, the outer peripheral surface was cut to form the screw thread portion 32. Also, the conventional fiber-reinforced synthetic resin nut is also heated and hardened into a rod shape in the same manner as the above bolt, and then the inner peripheral surface of the central hole opened in the axial direction is cut to form a thread portion. Was.

However, in the bolt, the fiber 31 parallel to the axis forming the thread portion is formed in the valley portion 3 by the cutting work.
The function of the fiber as the reinforcing material is lost, the strength against the axial stress shown by the arrow applied to the screw thread portion 32 is reduced, and the screw thread is applied when a certain amount of force is applied. There is a drawback that the part 32 is easily damaged.
Further, the conventional fiber-reinforced synthetic resin nut also has a drawback that the thread portion is easily damaged for the same reason.

Therefore, in order to solve the above-mentioned problems, as shown in FIGS. 8 (a) and 8 (b), a fiber string or a fiber string is attached to the outer periphery of the fibers 31 which are aligned and bundled so as to be arranged in the axial direction. By winding the tape in a spiral shape, an uneven structure 34 is formed on the surface of the core body 36, the core body having this uneven structure is impregnated with a synthetic resin, and then the core body is formed using a screw-shaped molding die. While compressing and molding, the liquid resin is cured to give an uneven texture 3
A fiber-reinforced synthetic resin bolt has been proposed in which the fibers forming No. 4 enter the threaded portion 32 (Japanese Patent Laid-Open No. Hei 7 (1999)).
-279933).

In this fiber-reinforced synthetic resin bolt, when the fibers of the concave-convex structure 34 forming the male screw portion are strings, as shown in FIG. 8 (a), a spiral is formed on the outer peripheral surface of the core body 36. Since it is formed in a circular shape and in an angular state intersecting with the fibers forming the core material, it has an effect of improving the strength against the axial stress as compared with the above-described conventional bolts. Since the applied stress acts in the direction of the arrow that separates the fibers 37 in the thread portion from each other, there is a problem that the reinforcing effect based on the inherent strength of the fibers in the length direction of the fibers cannot be sufficiently obtained. Concavo-convex structure 3 forming a male screw part
When the fiber of No. 4 is a tape, as shown in (b) of FIG. 8, it does not sufficiently penetrate into the thread portion 32, so that there is a problem that a sufficient reinforcing effect cannot be obtained.

Therefore, in view of the above-mentioned conventional problems, an object of the present invention is to provide a bolt and nut made of fiber reinforced synthetic resin capable of further strengthening the thread portion of the bolt.

[0007]

As a result of repeated trial production studies for solving the above-mentioned problems, the present inventors have completed extremely desirable fiber-reinforced synthetic resin bolts and nuts.
That is, the fiber-reinforced synthetic resin bolt of the present invention is a fiber-reinforced synthetic resin bolt formed by arranging a plurality of fibers substantially parallel to each other in an axial direction of the bolt, in a plane substantially perpendicular to the axis of the bolt. The fibers are arranged in the. Further, in the fiber-reinforced synthetic resin bolt of the present invention, among the fibers arranged in a plane substantially perpendicular to the axis of the bolt, a part of the fibers is at least 1/3 of the base of the screw thread. Having fibers that have reached height. Furthermore, in the fiber-reinforced synthetic resin nut of the present invention, fibers are arranged in a thread portion of the nut in a plane substantially perpendicular to the axis of the bolt to be combined with the nut, and a part of the fibers is screwed. It has fibers that have reached at least 1/3 the height of the base of the mountain.

[Operation] The fiber-reinforced synthetic resin bolts and nuts of the present invention have a structure in which the fibers that enter the threaded portions are arranged in a plane that is substantially perpendicular to the bolt axis. It is possible to improve the strength against the stress applied to the bolts and nuts with high strength in the thread portion.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the fiber reinforced synthetic resin bolt and nut of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic partially enlarged cross-sectional view showing an example of a fiber-reinforced synthetic resin bolt according to the present invention. 2 (a) to 2 (d) are schematic views showing an example of one step of the method for producing the fiber-reinforced synthetic resin bolt of the present invention, and FIGS. 3 (a) to 3 (d) show the present invention. It is a schematic diagram which shows another example of a manufacturing process of a fiber reinforced synthetic resin bolt. FIG. 4 is a schematic partially enlarged cross-sectional view showing an example of the fiber-reinforced synthetic resin nut according to the present invention. 5 (a),
(B) is a schematic diagram which shows an example of a manufacturing process of the fiber reinforced synthetic resin nut of this invention, and FIG. 6 is a schematic diagram which shows an example of another manufacturing process.

First, the fiber-reinforced synthetic resin bolt of the present invention will be described with reference to FIGS. Figure 1
As shown in, the fiber-reinforced synthetic resin bolt 1 of the present invention
Has a plurality of fibers (hereinafter referred to as longitudinal fibers) 2 aligned in parallel in the axial direction to form a bundle. The thread portion 3 of the bolt 1 is substantially perpendicular to the axis of the bolt 1. It is composed of fibers 4 (hereinafter referred to as horizontal fibers) arranged in a plane. It is preferable that a part of the length of the transverse fibers 4 is inserted into the bundle of the plurality of longitudinal fibers 2 and is substantially erected from the bundle of the longitudinal fibers 2.

As a method of arranging the above-mentioned transverse fibers 4 in a plane perpendicular to the axis of the bolt 1, the methods shown in FIGS. 2 and 3 can be exemplified. In the method shown in FIG. 2, first, the fibers 11 cut into appropriate lengths are arranged, the same fibers 12 (however, different kinds of fibers may be passed) are passed above and below, and the fibers 12 are twisted to form the fibers 12 Fiber mass 13 in which fibers 11 are radially arranged with respect to
Are formed [(b) of FIG. 2].

Next, the fiber mass 13 is bundled so that it is located outside the uncured core rod 14 produced by bundling the longitudinal fibers 2 and impregnating the resin [(c) in FIG. 2], and the resin After the impregnation, the resin is thickened to form the prepreg 15, and the prepreg 15 is set in the split mold 16 for processing the thread portion [(d) in FIG. 2] and compressed in the circumferential direction. While curing. By this compression, the transverse fibers 4 of the fiber mass 13 are integrated with the bundle of the longitudinal fibers 2 forming the core rod 14, and are in a state of being almost vertically planted from within the longitudinal fibers 2.

In the method shown in FIG. 3, first, while applying the binder, the fibers 20 cut to an appropriate length are dropped into an upright double tube [FIG. 3 (a)] and lightly pressed from above. , The fibers are integrated to form a cylinder made of transverse fibers,
The uncured cylindrical core rod 22 made by bundling the longitudinal fibers 2 and impregnated with the resin is inserted into the through hole of the cylindrical body 21 taken out from the inside of the double pipe [FIG. Body 21
While being impregnated with resin, it is set in the cylindrical mold 23 [FIG. 3 (c)].

Then, when the cylindrical core rod 22 is pulled up and down and the cylindrical body 21 is compressed by the pressing member 24, the weft fibers 4 arranged in the radial direction of the cylindrical body 21 are
Under pressure, the fibers enter the longitudinal fibers 2 and a part of the transverse fibers 4 is almost in a state of being erected from within the longitudinal fibers 2.

In the fiber-reinforced synthetic resin bolt of the present invention, as shown in FIG. 1, the horizontal fibers 4 reach at least a height of 1/3 from the base 5 to the top 6 of the thread portion 3. Is preferred. In the thread portion where the weft fiber is not included, the thread is likely to be chipped, and it is difficult to obtain the effect of the present invention.

Next, the fiber-reinforced synthetic resin nut of the present invention will be described with reference to FIGS. As shown in FIG. 4, the fiber-reinforced synthetic resin nut 40 of the present invention has a plurality of fibers (hereinafter referred to as a horizontal line) in a thread portion 42 in a plane substantially perpendicular to the axis of the bolt combined with the nut 40. The fibers 43 are arranged. This horizontal fiber 43
Is a state in which a part of the length thereof enters into a plurality of fibers (hereinafter, referred to as vertical fibers) 41 constituting the main body portion 44 of the nut 40 excluding the screw thread portion 42 and is planted from the inside of the vertical fibers 41. Is preferred. In addition, in the fiber-reinforced synthetic resin nut 40 of the present invention, the horizontal fiber 43 is provided in the thread portion 42.
Is arranged, the longitudinal fibers 41 do not necessarily have to be arranged in the main body portion 44, and the nut 40 does not have the transverse fibers 43.
You may be comprised only.

A method of manufacturing the fiber-reinforced synthetic resin nut 40 of the present invention will be illustrated below with reference to FIGS. In the method shown in FIG. 5, the fiber mass 13 formed by the same method as the manufacturing method of the bolt shown in FIGS. 2 (a) and 2 (b) is arranged around the screw mold 45, and the nut is provided on the outer periphery thereof. After disposing the longitudinal fibers 41 to be the main body portion 44 of the resin and further impregnating these fibers with resin, the resin is thickened to form the prepreg 46, and the prepreg 46 is processed into a nut shape. When set in the mold 47 [(b) of FIG. 5], pressure-bonded in the circumferential direction to cure, and when the screw mold 45 is removed, the fiber reinforced synthetic resin nut in which the horizontal fibers 43 are arranged in the screw thread portion Can be manufactured.

In the method shown in FIG. 6, a cylindrical body composed of the weft fibers 43 formed by the same method as the manufacturing process of the bolt shown in FIGS. 3 (a) and 3 (b) is molded,
After impregnating this with a resin, the resin is thickened to form a prepreg 48, and a screw die 45 is inserted into the center through hole of the prepreg 48, and in that state, the crack shown in FIG. The nut is made of fiber reinforced synthetic resin in a state where the horizontal fibers 43 are arranged in the threaded portion by setting the mold 47, curing it while crimping it in the circumferential direction, and then removing the screw mold 45.

In the fiber-reinforced synthetic resin nut of the present invention, the weft fiber 43 is also used for the same reason as the above-mentioned bolt.
Preferably reaches a height of at least 1/3 from the base to the top of the thread 42.

As the longitudinal fibers and the transverse fibers used in the fiber-reinforced synthetic resin bolts and nuts of the present invention, carbon fibers, glass fibers and the like generally used in FRP can be used. Further, it is preferable to use the same type of fibers as the longitudinal fibers and the horizontal fibers, but it is also possible to use a combination of different types of fibers. Further, as the thermosetting liquid resin used for fixing the fibers, unsaturated polyester resin, epoxy acrylate resin, epoxy resin and the like are used.

[0021]

EXAMPLE Next, a fiber-reinforced synthetic resin bolt of the present invention and a conventional fiber-reinforced synthetic resin bolt were prepared and compared.
The bolt of the present invention was manufactured by the method described in the following examples, but the manufacturing method is not limited to these.

[Example 1] First, glass fibers 11 cut to a length of 8 mm are arranged, and the same glass fibers 12 are provided above and below the glass fibers 11.
[FIG. 2 (a)], and by twisting one end in a fixed state, a fiber lump 13 in which glass fibers 11 were radially arranged with respect to the fiber 12 was formed [FIG. 2 (b)].
Next, the fiber lump 13 is bundled so that it is located outside the uncured core rod 14 having a diameter of about 8 mm, which is produced by bundling glass fibers and impregnating the resin [FIG.
(C)], and after being impregnated with an unsaturated polyester resin containing a thickener, the resin was thickened to obtain a B-stage prepreg having a diameter of 16 mmφ. Next, this prepreg 15
Is set in the split mold 16 [Fig. 2 (d)], and is cured while being compressed in the circumferential direction to form a male screw, and the screw diameter is M.
Sixteen fiber-reinforced synthetic resin bolts of the present invention were produced.

Example 2 First, glass fibers were coated with a binder and cut into a length of 3 mm, and the fibers 20
As shown in Fig. 3 (a), the inner diameter is 8mmφ and the outer diameter is 16m.
Drop into a double pipe of mφ, inner diameter 8mmφ, outer diameter 16m
An uncured cylindrical core rod 2 made of longitudinal fibers 2 having a diameter of about 8 mm, which is formed by molding a cylindrical body 21 of mφ and impregnating a through hole of the cylindrical body 21 with glass fiber and impregnating it with resin.
2 was inserted [FIG. 3 (b)], and in this state, the cylindrical body 21 was impregnated with resin and set in a cylindrical mold 23 having an inner diameter of 16 mmφ [FIG. 3 (c)].

Next, while pulling the columnar mandrel 22 up and down, the cylindrical body 21 is compressed by the pressing member 24, the glass filling rate of this portion is adjusted, and the resin is hardened while keeping this state to cure the cylindrical body. 25 [FIG. 3 (d)] was molded. The outer peripheral surface of the obtained cylindrical body 25 was cut by a cutting tool 26 to form a male screw 27, and a fiber-reinforced synthetic resin bolt having the same size as in Example 1 was produced.

[Comparative Example 1] The glass fibers were aligned so as to be arranged in the axial direction to form a bundle.
By impregnating the same liquid unsaturated polyester resin as in the example, and heating and hardening it into a rod shape, the inner peripheral surface of the center hole opened in the axial direction is cut to form a threaded portion by the conventional manufacturing method. A fiber-reinforced synthetic resin bolt having the same size as in Example 1 was produced.

[Comparative Example 2] Glass fibers bundled by aligning bolts in the axial direction are impregnated with an unsaturated polyester resin, and a resin-impregnated glass fiber string is wound around the outer periphery thereof. Then, an uneven structure is formed on the surface of the core body, the unsaturated polyester resin is cured while the core body is compression-molded using a screw-shaped molding die, and the fibers of the uneven structure enter the screw thread portion. JP-A-7-279933
A fiber-reinforced synthetic resin bolt having the same size as in Example 1 was produced by the method described in Japanese Patent Publication No.

Using the fiber-reinforced synthetic resin bolt of the present invention obtained in Examples 1 and 2 and the fiber-reinforced synthetic resin bolt obtained in Comparative Examples 1 and 2 using the conventional manufacturing method,
Table 1 summarizes the comparison between the tensile strength of the thread portion when engaged with the nut and the glass content rate. A metal nut was used to measure the tensile strength.

[0028]

[Table 1]

From the results shown in Table 1 above, the tensile strength of the fiber-reinforced synthetic resin bolt of the present invention is higher than that of the conventional bolt, and the fiber-reinforced synthetic resin bolt of the present invention is made of the conventional fiber-reinforced synthetic resin. It can be seen that the strength of the thread portion is higher than that of bolts, because it has a stronger pulling force.

With respect to the fiber-reinforced synthetic resin nut of the present invention, two types of fibers and resins similar to those of the fiber-reinforced synthetic resin bolt of the present invention are used by the method shown in FIGS. 5 and 6 described above. When a nut was manufactured and compared with a conventional nut made of fiber reinforced synthetic resin, substantially the same result as in Table 1 was obtained, and like the fiber reinforced synthetic resin bolt of the present invention, it is strong against pulling and strength of the screw thread portion. It has been found that an excellent nut can be obtained.

[0031]

According to the present invention, it is possible to obtain a bolt and nut made of fiber reinforced synthetic resin, which has a high tensile strength and a high breaking strength at the thread portion.

[Brief description of drawings]

FIG. 1 is a schematic partially enlarged cross-sectional view showing an example of a fiber-reinforced synthetic resin bolt of the present invention.

2 (a) to (d) are schematic views showing an example of one step of a method for manufacturing a fiber-reinforced synthetic resin bolt of the present invention.

3A to 3D are schematic views showing another example of the manufacturing process of the fiber-reinforced synthetic resin bolt of the present invention.

FIG. 4 is a schematic partial enlarged cross-sectional view showing an example of a fiber-reinforced synthetic resin nut according to the present invention.

5 (a) and 5 (b) are schematic views showing an example of a manufacturing process of the fiber-reinforced synthetic resin nut of the present invention.

FIG. 6 is a schematic view showing an example of another manufacturing process of the fiber-reinforced synthetic resin nut of the present invention.

FIG. 7 is a schematic partial cross-sectional view showing an example of a conventional fiber-reinforced synthetic resin bolt.

8A and 8B are schematic partial cross-sectional views showing another example of a conventional fiber-reinforced synthetic resin bolt.

[Explanation of symbols]

1 Fiber reinforced synthetic resin bolt 2,41 vertical fibers 3,32,42 screw thread 4,43 weft fiber 5 Thread base 6 Top of screw thread 11,12 glass fiber 13 Fiber mass 14 core rod 15,46,48 prepreg 16,47 split mold 20 fibers 21 cylindrical body 22 Cylindrical core rod 23 cylindrical type 24 Pressing member 25 cylinder 26 cutting tools 27 Male screw 31,37 fiber 33 Tanibe 34 Uneven structure 36 core 40 Fiber reinforced synthetic resin nut 44 Nut body 45 screw type

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shoichi Yamamoto             3-1-25 Yoshioka Higashi, Ayase City, Kanagawa Prefecture             Limited company Sansho Giken

Claims (3)

[Claims] 1. A fiber-reinforced synthetic resin bolt, in which a plurality of fibers are arranged substantially parallel to each other in the axial direction of the bolt,
A fiber reinforced synthetic resin bolt in which fibers are arranged in a plane substantially perpendicular to the axis of the bolt. 2. Among the fibers arranged in a plane substantially perpendicular to the axis of the bolt, a part of the fibers reaches a height of at least 1/3 from the base of the screw thread. The fiber-reinforced synthetic resin bolt according to claim 1. 3. A fiber reinforced synthetic resin nut is provided with a thread in a thread portion thereof in a plane substantially perpendicular to an axial direction of a bolt assembled to the nut, and a part of the fiber is A fiber-reinforced synthetic resin nut having fibers reaching a height of at least 1/3 from the base.