JPH0229916B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fiber-reinforced resin flange whose circumferential direction is reinforced with long fibers, and a method for manufacturing the same.

(Prior art) Conventionally, in order to form a flange on a thermoplastic resin pipe as a pipe connection part, a tapered core is fitted to the thermosetting resin pipe to form a conical flange, and a thermoplastic resin is attached to the conical flange. The so-called tapered core method, a method of connecting thermoplastic resin pipes by fitting and tightening tapered flanges made from manufactured products, has been common.

(Problems to be Solved by the Invention) However, in this case, when the tapered flange is made of a thermoplastic resin material such as vinyl chloride resin, the flange portion 1' is attached to a bolt or nut as shown in FIG. When tightening with gasket 3', the flange 1' may wave depending on the tightening condition, and over a long period of time, the tightening force weakens due to creep, etc., and the compressive force of gasket 3' decreases, causing fluid to leak from that part. It was hot.

In addition, Japanese Patent Application Laid-Open No. 1983-1989 (Kokai) developed a technique to create a hollow disk with uniform strength in the thickness direction by wrapping resin-impregnated glass fiber between the side plates of a mold.
It is disclosed in Publication No. 34425. When attempting to drill bolt holes in this hollow disk to use it as a flange, the reinforcing fibers cause severe wear on tools such as drills, which makes it difficult to drill holes efficiently, and dust is scattered during the process. There were drawbacks such as a poor environment.

Another drawback is that even if you try to drive a pin for forming a bolt hole in an uncured state after winding the long fibers, you cannot do so because the long fibers are wound at a constant tension. It was hot.

(Means for solving the problem) In view of the drawbacks of the above-mentioned prior art, the invention relating to the "fiber-reinforced resin flange" described in claim 1 (hereinafter referred to as the invention described in claim 1)・It was designed to provide a flange that does not cause deformation such as waving even when tightened with nuts, etc., and has excellent long-term creep resistance.The gist is that it is reinforced in the circumferential direction with long fibers. The fiber-reinforced resin flange has an inner wall layer and an outer wall layer made of aluminum, and an intermediate layer reinforced with short fibers, and has bolt holes drilled in the intermediate layer.

In addition, the invention related to the "method for manufacturing a fiber-reinforced resin flange" described in item 2 (hereinafter referred to as the invention described in item 2) addresses the problems that exist in the manufacturing method disclosed in JP-A No. 56-34425 mentioned above. The problem is that even if you try to drive the long fibers in an uncured state after winding them to form bolt holes, you cannot do it because the long fibers are wound at a constant tension. This was done with the aim of solving this problem and providing a method for easily forming a flange that does not cause deformation such as waving even when tightened with bolts and nuts, and has excellent creep resistance over a long period of time. The gist is that the core body is provided with a pair of flanges, and the flanges are provided with a plurality of pin holes facing each other on approximately the same circumference, and a thermosetting resin is impregnated between the core-shaped flanges. The long fibers obtained are wound to the vicinity of the pin hole to form an inner wall layer, a molding material containing short fibers is supplied around the inner wall layer to the outside of the pin hole to form an intermediate layer, and further around the inner wall layer. The fiber reinforcement is characterized in that long fibers impregnated with the thermosetting resin are wound to form an outer wall layer, and pins are inserted into the pin holes before or after the formation of the intermediate layer, and the fibers are cured as a whole. It consists in a method of manufacturing a resin flange.

(Function) The invention described in item 1 has excellent strength particularly in the circumferential direction because the inner wall layer and the outer wall layer are reinforced in the circumferential direction with long fibers, and the intermediate layer reinforced with short fibers has bolts. Since the holes are provided, layer defects due to fiber cutting are not observed.

The invention described in item 2 involves inserting a pin into a pin hole before or after forming an intermediate layer formed by supplying a molding material containing short fibers. The area around it will be reinforced with short fibers.

(Example) The present invention will be explained below based on the drawings.

First, the invention described in item 1 will be explained.

Figure 1 is a front view showing one embodiment of the present invention, Figure 2 is a front view showing one embodiment of the present invention;
The figure is a sectional view taken along the line of FIG.

1 is a fiber-reinforced resin flange, which has a donut shape, and from the open hole side to the outside,
It has a laminated structure consisting of three layers: an inner wall layer 3, an intermediate layer 5, and an outer wall layer 4. A tapered portion 11 is provided on the inner circumferential surface of the opening of the fiber-reinforced resin flange 1 so that the end portion of the connected pipe into which the tapered core is fitted can be tightened. Flange 1
The inner wall layer 3 and the outer wall layer 4 are made of thermosetting resin 30, 40 such as unsaturated polyester resin and long fibers 31, 41 such as glass roving, and are reinforced in the circumferential direction by the long fibers 31, 41. There is. An intermediate layer 5 is provided between the inner wall layer 3 and the outer wall layer 4, and the intermediate layer 5 is made of the same thermosetting resin 60 as the inner and outer wall layers to which short fibers 61 such as glass chopped strands are added. It is made of molding material 6.
The molding material 6 may include, in addition to the short fibers 61, powdered fillers such as calcium carbonate and talc, or micro hollow bodies such as shirasu balloons and silica balloons. Bolt holes 2, 2, . . . are formed in the intermediate layer 5 at equal intervals on the same circumference. Preferably, the thickness of the intermediate layer 5 is approximately the same as the diameter of the bolt hole 2.

In addition to glass roving, the long fibers 31 and 41 are
It may be glass roving cloth, glass chopped strand mat, glass cloth, glass surfing mat, or short fibers such as glass chopped strand may be used in combination.

Next, the invention described in Section 2 will be explained. FIG. 3 is an explanatory view showing a method of manufacturing a fiber-reinforced resin flange, and FIG. 4 is a sectional view taken along the line shown in FIG. 3.

7 is a core mold for molding a fiber-reinforced resin flange, and a pair of flanges 711 and 713 are provided on a core body 71 having a tapered portion 712 on the outer peripheral surface. The core body 71 is removably attached to the rotating shaft 9 with a fixing member 8 such as a nut, and is adapted to rotate in accordance with the rotation of the rotating shaft 9. The flange 711 is integrated with the core 71, and the flange 713 is integrated with the core 71.
It can be attached and detached from the end face of the Tsuba 711,
713 is provided with a plurality of pin holes 12, 12, .
A pin 13 for forming the is inserted. 10 is a ring-shaped body for demolding.

A long fiber 14 such as a glass roving impregnated with a thermosetting resin such as an unsaturated polyester resin is placed around the core mold 7 configured as described above, and pin holes 12 provided in the flanges 711 and 713 of the core body 71 are attached. The inner wall layer 3 is formed by winding the inner wall layer 3 to a required thickness up to approximately . Next, the pin 13 is inserted into the pin hole 12, and the space formed by the pins 13 is filled with a molding material made of a thermosetting resin such as an unsaturated polyester resin containing short fibers such as glass chopped strands. 6 to form an intermediate layer 5 having a wall thickness approximately equal to the diameter of the pin 13, and then continuous fibers 14 impregnated with a thermosetting resin are wound around the intermediate layer 5 to a required thickness to form an outer wall layer 4. After forming, it is cured at room temperature or by heating. After hardening, the pin 13 is removed and the core mold 7 is demolded to produce a fiber-reinforced resin flange provided with bolt holes 2.

Note that after forming the inner wall layer 3, the bolt hole 2 is formed by forming the intermediate layer 5 and the outer wall layer 4 in the same manner as in the above embodiment without inserting the pin 13 into the hole 12.
After the formation of the inner and outer wall layers and the intermediate layer is completed, the holes 12 are
The pin 13 may be driven into the hole. At this time, it is preferable to attach a two-part outer mold having an inner surface shape substantially equal to the outer surface shape of the outer wall layer and attach it to the outer wall layer.

Further, as shown in FIG. 5, the intermediate layer 5 is formed by winding long fibers 14 such as glass roving impregnated with a thermosetting resin around the core mold 7 to a required thickness, and then forming the inner wall layer 3. Subsequently, the molding material 6 may be supplied while inserting the pins 13 one by one from arbitrary pin hole positions, and the long fibers 14 may be wound so as to cross adjacent pins 13.

In this case, since the intermediate layer 5 is reinforced with short fibers and continuous long fibers with no cut points, it is possible to obtain an intermediate layer 5 with higher strength.

(Effects of the Invention) As described above, the fiber-reinforced resin flange of the present invention has particularly excellent strength in the circumferential direction because the inner wall layer and outer wall layer are reinforced with long fibers in the circumferential direction. It does not cause deformation such as waving even if it is tightened with a screwdriver, etc., and has excellent long-term creep resistance. In addition, bolt holes are provided in the intermediate layer reinforced with short fibers, so
Layer defects due to fiber cutting, which occur when bolt holes are formed in a layer reinforced with long fibers, do not occur, and there is no risk of cracks occurring in the fiber direction when bolts are tightened. In addition, the method for manufacturing a fiber-reinforced resin flange of the present invention includes a method of manufacturing a fiber-reinforced resin flange by moving long fibers impregnated with a thermosetting resin around a core mold in which pin holes are provided oppositely to each other in a pair of brim portions, up to the vicinity of the pin holes. The material is wound to form an inner wall layer, and a molding material containing short fibers is supplied around the inner wall layer to form an intermediate layer. Before or after forming this intermediate layer, a pin is inserted into the pin hole. Even if bolt holes are formed in the flange, the area around the bolt holes is reinforced with short fibers, which can reduce the decrease in strength between the inner and outer wall layers. A fiber-reinforced resin flange with excellent circumferential strength can be manufactured with a core type having a simple structure.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the fiber-reinforced resin flange of the present invention, Fig. 2 is a sectional view taken along the line - Fig. 1, and Fig. 3 is an explanation showing a method for manufacturing the fiber-reinforced resin flange of the present invention. Figure 4 is a sectional view along the line shown in Figure 3, Figure 5 is a sectional view showing a modified example of the intermediate layer, and Figure 6 shows a conventional thermoplastic resin flange in use with some parts omitted. It is an explanatory diagram. DESCRIPTION OF SYMBOLS 1...Fiber reinforced resin flange, 11...Tapered part, 2...Bolt hole, 3...Inner wall layer, 31,
41... Long fiber, 30, 40, 60... Thermosetting resin, 4... Outer wall layer, 5... Intermediate layer, 6... Molding material, 61... Short fiber, 7... Core mold, 71... ... Core body, 711, 713 ... Flange section, 12 ... Pin hole,
13...Pin, 14...Resin-impregnated long fiber.

Claims (1)

[Claims] 1. A fiber comprising an inner wall layer and an outer wall layer reinforced in the circumferential direction with long fibers, and an intermediate layer reinforced with short fibers, with bolt holes drilled in the intermediate layer. Reinforced resin flange. 2. The core body is provided with an integral flange, and the flange has a long core impregnated with a thermosetting resin between the core-shaped flange portions in which a plurality of pin holes are provided facing each other on substantially the same circumference. The fibers are wound around the pin hole to form an inner wall layer, a molding material containing short fibers is supplied around the inner wall layer to the outside of the pin hole to form an intermediate layer, and the intermediate layer is formed around the inner wall layer. Made of fiber-reinforced resin, characterized in that long fibers impregnated with thermosetting resin are wound to form the outer wall layer, pins are inserted into the pin holes before or after the formation of the intermediate layer, and the product is cured as a unit. How to manufacture flanges.