JPH0153627B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a prefabricated cylindrical component made of fiber-reinforced plastics which constitutes a cylinder by fitting together.

Fiber-reinforced plastics (hereinafter referred to as FRP) are widely used for electrical wire troughs, various covers, ducts, etc. because they have excellent electrical insulation and chemical resistance as well as strength. There is. These FRP cylindrical bodies are commercialized in half in order to improve the efficiency of transportation to the construction site.
When installed, they are tightened together with belts or fastened together with rivets or bolts to form a trough, cover duct, etc. of a predetermined shape.

Such half-split cylindrical products are produced by forming a gutter-like product using press molding or continuous pultrusion, and attaching fitting members with an H-shaped cross section prepared in advance to both side edges of the gutter-like product to form a gutter-like body. A method of fitting the lid with the lid is widely used.

According to this method, the main body and the fitting member are produced separately and assembled, which requires a large number of man-hours and has the drawback that productivity is low. Even when molding half-split products with fitting parts, productivity is lower than when molding integrally into a cylindrical shape, especially when the number of parts is large or the parts are not divided into symmetrical shapes. significantly reduces productivity.

The present invention has been made in order to solve the problems of the prior art described above, and a first object is to provide a method for manufacturing a composition member for obtaining an assembled cylindrical body with high productivity. A second object of the present invention is to provide a method for manufacturing a composition member that can be formed into an assembled cylindrical body having high strength not only in the vertical direction but also in the lateral direction.

The purpose is to draw a reinforcing fiber impregnated with a thermosetting resin into a die and create a cylindrical body having at least two bifurcated portions that form an axial groove that opens in the circumferential direction between the reinforcing fiber and the peripheral wall surface. molding, and then cutting the bifurcated portion of the cylindrical body along the axis of the cylindrical body at a position where the groove formed by the bifurcated portion forms an end,
This is achieved by dividing the cylindrical body into a plurality of members, each of which has a fitting groove on at least one end and an insert portion that fits into the fitting groove of another member on at least one end.

Hereinafter, the method of the present invention will be explained in detail based on an embodiment shown in the drawings. Although not shown, mat or cloth is usually used together with the shown reinforcing fibers 1 as needed.

FIG. 1 shows an embodiment of a pultrusion molding machine for carrying out the method of the present invention. In this pultrusion molding machine, reinforcing fibers 1 are immersed in a resin bath 2 to be impregnated with a thermosetting resin, then drawn into a cylindrical shape and fed to a die 3, and while being passed through the die 3, the reinforcing fibers are shaped into a predetermined shape. The desired cylindrical body 10 is molded by heating and curing.

Although not shown, the die 3 has a heat source maintained at a temperature suitable for curing the thermosetting resin impregnated into the reinforcing fiber 1, and is identical to the desired cylindrical body 10. It has a shaped die hole. That is, as shown in FIGS. 4 to 9, the die 3 includes a cylindrical body 10 having bifurcated portions 12 at at least two locations that form axial grooves 11 that open in the circumferential direction between the die 3 and the peripheral wall surface. It has a corresponding die hole. The shape of the tube is not limited to a cylindrical shape, but may be a rectangular tube shape, a circular shape, or the like. Further, the bifurcated portions 12 are required to be provided in at least two locations, but may be provided in more than three locations as shown in FIG. 6 or four locations as shown in FIG. 8. Furthermore, the position of this bifurcated portion 12 is
It may be either the outer circumferential wall or the inner circumferential wall, and may not be arranged symmetrically. In addition, the bifurcated part 1
If the bifurcated portion 12 is present only on either the outer circumferential wall or the inner circumferential wall, the direction shown in FIG.
It is preferable to have them in the same direction as shown in Figure 8, but if they are formed on the outer peripheral wall and the inner peripheral wall, it is more appropriate to have them in opposite directions so that they face each other as shown in Figure 9. Desirable for achieving a good fit. Of course, this principle does not apply when the cylindrical body 10 is divided into three or more parts. Note that the groove 11 formed in the bifurcated portion 12 divides the cylindrical body 10 into a plurality of cylindrical body composition members 10a, 10b, . . . and fits each cylindrical body composition member 10a, 10b... This serves as a fitting part when assembling the cylindrical body 10. Therefore, it is preferable that the width of this groove 11 is approximately the same as the thickness of the cylindrical body 10. Of course, the bifurcated part 1
The width of the groove 2 may be greater than the wall thickness of the cylindrical body 10, and the flat insertion portion 13 of another cylindrical body component member may be fitted through rubber packing.

In addition, as the thermosetting resin, unsaturated polyester resin, epoxy resin, vinyl ester resin, etc. can be used, but unsaturated polyester resin is particularly useful because it is easy to handle and the curing characteristics can be easily adjusted. preferable.

Further, as the reinforcing fiber, glass fiber, polyamide fiber, carbon fiber, etc. can be used, and among them, the use of glass fiber is preferable because it is inexpensive. As the reinforcing fiber base material, in addition to continuous roving, materials in the shape of pine, cloth, etc. are used.

In the pultrusion molding machine shown in FIG. 1, when forming the cylindrical body 10 by making extensive use of longitudinal reinforcing fibers/rovings 1, the strength in the lateral direction is insufficient, so it is difficult to resist external forces in the lateral direction. In order to form a strong cylindrical body 10, the pultrusion molding machine shown in FIGS. 2 and 3 may be used to reinforce the lateral reinforcing fibers/rovings 4.

The pultrusion molding machine shown in FIG. 2 immerses reinforcing fibers 1 in a resin bath 2 to impregnate them with a thermosetting resin, then draws them into a cylindrical shape and supplies them to a die 3. A horizontal roving 4 impregnated with a thermosetting resin is wound around a mandrel immediately before the die 3, and reinforcing fibers are introduced into the die 3 with reinforcing fibers arranged vertically and horizontally, and the roving is shaped into a predetermined shape and cured by heating. , a cylindrical body 10 having a desired shape is formed. In this case, although not shown, the horizontal rovings 4 are wound around the reinforcing fibers 1 by a roving supply device that revolves around them. Also,
If necessary, further horizontal rovings may be wound outside the above-mentioned horizontal rovings.

In the pultrusion molding machine shown in FIG. 3, reinforcing fibers 1 are immersed in a resin bath 2 to be impregnated with thermosetting resin, then stretched into a cylindrical shape and fed to a die, and are shaped into a predetermined shape while passing through a die 3. A cylindrical body 10 having a desired shape is prepared and heated and cured to form a cylindrical body 10 having a desired shape, making extensive use of the vertical rovings 1, while horizontal rovings impregnated with a thermosetting resin surround the cylindrical body 10 immediately after being pulled out from the die 3. 4 is wound, and then introduced into a tunnel-shaped hardening furnace 5 to be heated and hardened, and then overlayed.

The cylindrical body 10 formed into a desired shape by the above-mentioned pultrusion molding machine has a groove 1 formed by a bifurcated part 12.
The cylindrical body 10 is cut along the axis at the position where 1 forms the end, and a fitting groove 11 is formed in at least one end.
and a plurality of cylindrical body composition members 10a, 10b, which have at least one end an insertion portion 13 that fits into a fitting groove 11 of another member.
It is divided into 10c, 10d, .

In the embodiments shown in FIGS. 4 to 8, since the bifurcated portions 12 are formed on the inner peripheral wall of the cylindrical body 10 in the same direction, the cylindrical body composition members 10a, 10
b, 10c, 10d, . . . all have a fitting groove 11 consisting of a bifurcated portion 12 at one end, and an insertion portion 13 at the other end. However, as in the embodiment shown in FIG. 9, when the bifurcated portions 12 are formed in different directions on the inner peripheral wall and the outer peripheral wall of the cylindrical body 10, the cylindrical body has fitting grooves 11 at both ends. Cylindrical body composition member 1 having a member 10a and insertion portions 13 at both ends
0b. Further, in the case of this embodiment, the tips of the bifurcated portions 12 are cut with their ends aligned, but they may be cut with their ends aligned irregularly as long as the fitting grooves 11 sufficient for fitting can be formed. Note that the cylindrical body 10 can be cut using a tool such as an electric saw or a jigsaw. At this time, it is efficient to attach an electric saw to the rear of the pultrusion molding machine so as to continuously cut the cylindrical body 10 immediately after molding.

In this way, once formed into the cylindrical body 10, the cylindrical body composition members 10a, 10b, 10c, 1 are divided.
0d, ... are fitted together at the installation site,
It is assembled into the cylindrical body 10' again. At this time,
The fitting groove 11 of the bifurcated portion 12 and the insertion portion 13 fitted therein may be joined with an adhesive, or may be fastened with a rivet 14, a band, or the like.

As is clear from the above description, the present invention includes a bifurcated portion that draws a reinforcing fiber impregnated with a thermosetting resin into a die and forms an axial groove that opens in the circumferential direction between the reinforcing fiber and the peripheral wall surface. By molding a cylindrical body having at least two locations, and then dividing and cutting the bifurcated portion of the cylindrical body along the axis of the cylindrical body at a position where the groove formed by the bifurcated portion forms an end, A plurality of cylindrical body composition members, each consisting of one having a fitting groove at at least one end necessary for assembling the cylindrical body and another having an insertion portion at least one end that fits into the fitting groove of another member, are assembled at once. This allows you to dramatically increase productivity.

In addition, in the present invention, after the cylindrical body is once molded, it is divided into a plurality of cylindrical body composition members. The fibers are arranged in a cylindrical shape, and the lateral reinforcing fibers impregnated with a thermosetting resin are wound around the fibers while being drawn into a die, and heated and hardened, or the fibers are impregnated with a thermosetting resin. After the reinforcing fibers are drawn into a cylindrical shape and continuously drawn into a die and heated and hardened to form a cylindrical body, the lateral reinforcing fibers are impregnated with a thermosetting resin around the reinforcing fibers and then drawn out from the die. By winding and overlaying, it is possible to form an assembly type cylindrical body with high strength not only in the vertical direction but also in the lateral direction.

[Brief explanation of drawings]

Fig. 1 is a principle diagram showing one embodiment of the pultrusion machine that implements the method of the present invention, Fig. 2 is a principle diagram showing another embodiment of the same pultrusion machine, and Fig. 3 is a principle diagram showing another embodiment of the pultrusion machine. Principle diagram showing other embodiments, Fig. 4~
FIG. 9 shows an example of an assembly-type cylindrical body manufactured according to the present invention, in which a is a front view of the cylindrical body before dividing and cutting, and b is a composition of the cylindrical body after dividing. A front view showing the member, c is a front view of a cylindrical body obtained by assembling the cylindrical body composition members. 1, 4...Reinforcing fiber, 2...Thermosetting resin tank, 3...Dice, 5...Tunnel-shaped curing furnace, 1
0...Cylindrical body, 11...Groove, 12...Forked part, 1
3...Insert part.

Claims (1)

[Scope of Claims] 1. A cylindrical shape having at least two bifurcated portions that draw reinforcing fibers impregnated with a thermosetting resin into a die and form an axial groove opening in the circumferential direction between the reinforcing fiber and the peripheral wall surface. The bifurcated portion of the cylindrical body is then cut along the axis of the cylindrical body at a position where the groove formed by the bifurcated portion forms an end, and at least one end has a groove for fitting. 1. A method for producing a prefabricated cylindrical body composition member, the method comprising dividing the member into a plurality of members, including a member having an insertion portion at at least one end that fits into the fitting groove of another member. 2. The cylindrical body is formed by arranging reinforcing fibers impregnated with a thermosetting resin into a cylindrical shape, while winding the lateral reinforcing fibers impregnated with a thermosetting resin around the reinforcing fibers and drawing them into the die; A method for manufacturing an assembly type cylindrical composition member according to claim 1, which is formed by heating and curing. 3 The cylindrical body is made by aligning reinforcing fibers impregnated with a thermosetting resin into a cylindrical shape, continuously drawing them into a die, heating and curing them to form them, and then further impregnating the periphery with a thermosetting resin. 2. The method of manufacturing an assembly type cylindrical body composition member according to claim 1, wherein the lateral reinforcing fibers are wound, heated and cured in a tunnel-shaped curing furnace, and overlayed. 4. The method for manufacturing a prefabricated cylindrical body composition member according to any one of claims 1 to 3, wherein the thermosetting resin is an unsaturated polyester resin. 5. The method for manufacturing a prefabricated cylindrical body composition member according to any one of claims 1 to 4, wherein the reinforcing fibers are glass fibers.