JPS6022618B2 - Manufacturing method of reinforced plastic bent pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a reinforced plastic bent tube.

Conventionally, as a manufacturing method of a bent reinforced plastic pipe, as in Hakama Batsu No. 52-100585, the connecting portions at both ends of an uncured resin pipe are protected with odor control, and a mold is placed in a mold. A method is sometimes carried out in which the inside of the pot is heated while the uncured resin tube is placed on top of the tube, the uncured resin tube is first softened by heating and placed along the mold, and then cured by subsequent heating.

However, the conventional method described above has the disadvantage that the central portion of the hardened resin tube is easily crushed and deformed during molding, etc., and the appearance and physical properties of that portion deteriorate, making it undesirable for practical use. The present invention has been made with the aim of solving the above-mentioned drawbacks of the auxiliary mold. A molding material layer impregnated with gutter fat is wound thereon to form a molding material layer. Before the molding material layer is completely cured, the core mold is removed and the molding material layer is covered with an auxiliary mold on the inner surface. A method for manufacturing a reinforced plastic bent pipe characterized by bending and hardening the pipe in the attached state.

As the auxiliary mold used in the present invention, for example, a strip made of a material such as paper, plastic, aluminum, or iron is used.

As the resin used in the present invention, unsaturated polyester resin, epoxy resin, vinylester resin, acrylic resin, etc. are used, and if necessary, for example, in the case of unsaturated polyester resin, magnesium oxide, magnesium hydroxide, calcium oxide, Thickeners such as divalent metal oxides and hydroxides such as calcium hydroxide, or metal alcoholates are appropriately mixed and used.

The molding material used in the present invention includes reinforcing materials such as glass fibers, chemical fibers, and metal fibers, and if necessary, fillers such as sand and calcium carbonate, mixed as appropriate.

Hereinafter, the present invention will be explained by way of examples with reference to the drawings.
A core mold 5 is formed by applying adhesive to the outer surface of a strip material 2 made of paper or the like and spirally wrapping it overlappingly on a mandrel 1 whose one end is supported. A belt 4 is placed over the drum 3, and the drum 3 is rotated so that the core mold 5 is rotated in all directions around the mandrel 1 and simultaneously moved toward the tip. An inertia film 6 is wound around the core mold 5, a belt-shaped auxiliary mold 7 made of paper is wound thereon, and a mold release film 8 is wound thereon.

A molding material layer 9 is formed by winding a molding material 9', which is a mat made of glass fiber or the like impregnated with a resin liquid such as unsaturated polyester mixed with a thickener, on the release film 8 to form a molding material layer 9.

The molding material layer is not limited to those described above, and if necessary, the molding material layer 9 described above may be used as an inner surface layer of aggregate such as cinnabar sand, or if necessary, a short film made of glass fiber or the like. An intermediate layer made of resin mortar impregnated with a liquid resin such as unsaturated polyester mixed with a thickener is formed on the fibers and other fillers, and a mat made of glass fiber is formed on top of the intermediate layer. The outer surface layer may be formed by impregnating a resin liquid with a thickener mixed therein.

The molding material layer 9 is passed through a heating furnace 10 to thicken it so that it does not lose its shape (not completely cured), and then passed through a cutting machine 11.
The core mold 5 is cut into an appropriate length, and the core mold 5 is removed from the auxiliary mold 7 by sliding it through the slippery film 6, thereby obtaining a tubular body in which the auxiliary mold 7 is adhered to the inner surface of the molding material layer 9. Reference numeral 12 denotes a bending die, in which the bent cylindrical body 121 can be divided into an upper part 1211 and a lower part 1212, and the upper part 1211 and the lower part 1212
Frames 122 and 123 are attached to the lower sides, and protruding pieces are protruded outward from the edges of the upper part 1211 and the lower part 1212, and these protruding pieces can be tightened together with a vertical fixture as necessary. ing.

Regarding the upper part 1211 of the cylindrical body 121 of the bending die 12,
Place the tubular body in the lower part 1212 and place the upper part 12 on top of it.
11, press it from above, bend the tubular body along the inner shape of the bending die 12, and after curing it in that shape, open the upper part 1211 of the cylindrical body 121 of the bending die 12 and take out the tubular body. , the auxiliary mold 7 is removed to obtain a reinforced plastic bent pipe.

Incidentally, in the embodiment described above, a case has been described in which a core mold 5 is used, in which a belt-shaped material 2 made of paper or the like is wrapped around a mandrel. A core mold or the like that rotates in the direction and moves in the direction of the ball may also be used.

Since the present invention has the above-mentioned configuration, it is possible to manufacture a tubular molding material layer with an auxiliary mold attached to the inner surface by continuous manufacturing with good productivity using ordinary reinforced plastic pipe manufacturing equipment. In addition, during the bending process, the reinforced plastic bent tube can be manufactured without the center portion being crushed because it is supported by an auxiliary mold attached to the inner surface of the tubular molding material layer.

[Brief explanation of drawings]

Fig. 1 is a front view illustrating the first half of the process of the embodiment of the present invention, Fig. 2 is a cross-sectional view of a tubular body formed in the middle of the embodiment of the present invention, and Figs. 3 and 4 are respectively in accordance with the present invention. It is a front view and a side view explaining the latter half process of Example. Explanation of symbols, 1...Mandrel, 2...
・Band-shaped material, 5...Core type, 6...Film, 7
...Auxiliary mold, 8...Release film, 9.
... Molding material layer, 10 ... Heating furnace, 11
......Cutting machine, 12...Bending mold. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A belt-shaped auxiliary mold is wound around a core mold that rotates in the circumferential direction and moves in the axial direction, and a resin-impregnated molding material is wound on top of the core mold to form a molding material layer, and the molding material layer is completely cured. 1. A method for manufacturing a reinforced plastic bent pipe, which comprises first removing a core mold and bending and hardening the molding material layer with an auxiliary mold attached to the inner surface.