JPH0445919A - Manufacture of reinforced resin pipe joint - Google Patents

Abstract

PURPOSE:To achieve the homogenization of a product, to increase the strength against internal pressure and to enhance the dimensional accuracy of an inner surface by supplying a reinforced resin molding material to the outer periphery of a forming part by a filament winding method and removing a core mold after curing. CONSTITUTION:First of all, a core mold 1 are assembled and, after a release agent is applied to the core mold 1, a mat or cloth composed of a glass fiber impregnated with a resin solution of a thermosetting resin is laminated to the outer surface of the central recessed part (branched deformed part 21, small diameter part 43) of the core mold 1 to be held between split wood molds 8, 9 subjected to releasing treatment and semi-cured or cured to form an inner layer 11. The split wood molds 8, 9 are detached and staple fibers such as glass fibers are sprinklined over the entire surface of the inner layer 11 or sanding is applied to the outer surface thereof. Next, a reinforced resin molding material impregnated with a thermosetting resin solution same to or separate from the material of the inner layer is supplied to be wound around the outer peripheries of the core mold 1 and the inner layer 11 by a winding method to form an outer layer 12 so as to cover the entire surfaces of said outer peripheries. After curing, the core mold 1 is divided and pulled out to obtain a pipe joint.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing reinforcing resin cheeses, reducers, sockets, and other pipe joints by a filament winding method.

(Prior Art) Conventionally, as a manufacturing method for reinforced resin pipe joints, a reinforced resin molding material is supplied to a core mold that can be separated into releasable molds after curing by a molding method such as a hand lay-up method or a filament winding method. There is a well-known molding method in which a pipe joint is molded using a pipe joint, and after it is cured, the core mold is divided and demolded.

For example, Japanese Patent Publication No. 58-43014 and Japanese Patent Publication No. 58-43014
Publication No. 938883 and the like describe a method of manufacturing a reinforced resin pipe joint by supplying a reinforced resin molding material around a pre-molded socket 1 member and a core mold attached thereto. Furthermore, in Japanese Patent Application Laid-open No. 64-45625, half-split resin molded products are prepared in advance, and these are adhered to each other to form a core member of a pipe molded product, and the core member is impregnated with resin. A method for manufacturing a resin pipe joint by winding glass fibers is described.

(Problems to be Solved by the Invention) However, the hand-lay amplifier method requires complicated work, and it is difficult to obtain a homogeneous product because there are large differences depending on the skill of the operator. In particular, the molding of the socket portion of a pipe joint has the drawbacks of low strength and poor roundness. In addition, if the filament winding method is used, a homogeneous product can be obtained because it is machine wound, but a product with excellent strength can be obtained because a bundle of fibers (roving) is continuously introduced. can get. However, in the case of complex shapes such as large concave areas with small diameters, such as the center part of pipe joints such as cheese, sockets, reducers, etc., when the roving is wound, the roving may slip or spread out into a tape shape. This causes shrinkage of the fiber bundle, which causes the fiber bundle to overlap in a rod shape, making it difficult to wind it in a predetermined shape.

Furthermore, the above-mentioned Japanese Patent Publication No. 58-43014, :Iθ
In the manufacturing method described in Japanese Patent Publication No. 5-38883, etc., the central portion remains concave, making it difficult to mold using the filament winding method. In addition, since the first part of the receiver is molded in two parts or separately, the strength of the joint surfaces is not sufficient, leading to problems such as water leakage and destruction of the pipe joint.

Further, the manufacturing method described in Japanese Patent Application Laid-Open No. 64-45625 does not solve the problem of the hand I/I-bu method in the socket portion of the pipe joint.

An object of the present invention is to provide a method for manufacturing a reinforced resin pipe joint that is homogeneous, has excellent internal pressure strength, and has a good dimensional accuracy of the receiving CI portion by using the Ficimen 1 winding method.

(Means for Solving the Problems) The gist of the present invention is to form a concave portion having a branched deformed portion in the center, and to form a socket portion with an enlarged diameter by connecting to the branched deformed portion. In the method 4-7 of manufacturing a reinforced resin pipe joint using a core mold, an inner layer is molded on the outer periphery of the recessed part with a thick resin or reinforced resin, and the inner layer is hardened or semi-hardened. After that, a reinforced resin molding material !Mi1 is supplied by a filament winding method to the outer periphery of the forming part of the receiver L [where the inner layer and the molding core mold are exposed,
After the outer layer is formed and cured, the molding core is removed.

Hereinafter, the present invention will be described with reference to the accompanying drawings, with reference to an example of the cheese manufacturing process.

In the figure, reference numeral 1 denotes a molding core, which includes a main body core mold 2 that forms a straight pipe, an end core mold 3 that has portions at both ends of the main body core mold 2 that form the shape of a socket, and It consists of a branch core mold 4 having a part that forms the shape of the socket of the branch pipe, a concave part is formed in the central small diameter branch or the part where the diameter changes, and a predetermined inner part of the end pipe joint is formed at both ends. It is constructed so that it can be assembled to form a shape and can be separated and removed from the mold.

The main body core mold 2 has a small-diameter branch deformation part 21 at the center, has attachment parts for the end core mold 3 at both ends, and has a branch core mold 4 that branches from the small-diameter branch deformation part 21 in the center. It has an internal shape that is branched and deformed at the center of the pipe joint. End core molds 3 are separably attached and fixed to both ends of the main body core mold 2 by respective end camps 5 and support shafts 6. Further, the branch core mold 4 is separably attached and fixed to the central branch deformation portion 21 of the main body core mold 2 by an end cap 5 and a support shaft 7 at the end.

The end core mold 3 is a forming part 3 formed in the shape of a receiving recess of a pipe joint.
1 and the central small-diameter branch deformed portion 2], and has an enlarged diameter portion 32 that expands from approximately the same shape as the outer shape thereof to the same shape as the outer shape of the forming portion 31. The branch part core mold 4 includes a forming part 41 formed in the shape of a part of the socket of a pipe joint, an enlarged diameter part 42 that expands from the same outer shape as the branch deforming part 21 to the same outer shape as the forming part 41, and a blade. The end is connected to the enlarged diameter part 42 (7,
The other side is a small part 4 connected to a small diameter branch deformed part 21 in the center.
It has 3. This small portion 43 is the branch deformed portion 2.
It has approximately the same external shape as the connection part 1, and forms a concave part with the branch deformation part 21.

The end cap 5 has a cone shape, and a bin for winding the fibers is set up on the side of the end core mold 3. Support shaft 6
is held by a chuck of a filament winding device (not shown).

After assembling the molding core mold 1 and applying a mold release agent, the outer surface of the central concave portion (branch deformation portion 21, small portion 43) of the molding core mold 1 is covered with a mat or cloth made of glass fiber or the like. etc. impregnated with resin liquid such as thermosetting resin, etc. are laminated to the extent that the concave portion is filled, and as shown in Fig. 2, they are sandwiched between half-split wooden molds 8.9 that have been subjected to mold release treatment, and cured at 3V. Alternatively, the inner layer 11 (FIG. 3) is formed by curing. Remove the half-split wooden mold 8.9 and spread short fibers such as glass fiber on the entire surface of the inner layer 11 or sand the outer surface to improve adhesion with the outer layer to be formed later. .

Next, a reinforced resin molding material impregnated with the same or different thermosetting resin liquid as the inner layer 11 is supplied, and by a winding method, the reinforced resin is molded around the outer periphery of the molding core 1 and the inner layer 11. A material 4 is wound to cover the entire outer periphery to form an outer layer 12, and after hardening, the molding core j is divided and removed to obtain a pipe joint. The gap between the inner layer 11 and the outer layer 12
It becomes a product that is integrated with

The reinforcing resins used in the present invention include thermosetting resins made by impregnating continuous fibers such as rovings or yarns, cloak-like cross-like fibers, or chopped fibers with a resin liquid to strengthen the reinforcing resins. The molding material has a continuous roving impregnated with resin.

In the present invention, as the thermosetting resin, in addition to unsaturated polyester resin, epoxy resin, vinyl ester resin, etc. are used. The inner layer may be made of only thermosetting resin, but from the viewpoint of strength, it is better to mold it with reinforced resin. In addition to glass fibers, inorganic fibers such as carbon fibers, organic synthetic fibers such as aramid fibers, acrylic fibers, etc. may be used as the fibers.

Although the cheese having a branch has been described as a pipe joint having a branch deformation portion, the same applies to pipe joints such as a cash register and a socket. In addition, in ``-'', mats or cloth impregnated with thermosetting resin are laminated and a molded layer is formed using a half-split mold, but a closed mold is used to separate the core mold and the closed mold. A thermosetting resin or the like may be injected between the two and hardened to form a molded inner layer. Also,
As the reinforced resin impregnated with a thermosetting resin, the inner molded inner layer may be formed using a fiber-reinforced mat-like material made of a UV-cured resin or a prepreg material such as an epoxy resin. Further, it is not necessary to perform special treatments such as sprinkling glass fiber or sanding on the outer surface of the inner layer.

(Function) As described above, the method for manufacturing a pipe joint of the present invention uses the hand lay-up method to create a concave portion having a branch deformation portion in the center of the pipe joint, which does not require much dimensional accuracy compared to the socket portion. After the concave part in the center of the pipe joint is filled with resin or reinforced resin after swarming and forming, the continuous fibers impregnated with resin are wrapped, so the continuous fibers may slip or the fibers may overlap in bundles. It becomes possible to form filamentless twisting of pipe fittings with almost no complicated shapes. Therefore, it is possible to manufacture a reinforced resin pipe joint that is homogeneous, has good dimensional accuracy in the socket portion, and has excellent internal pressure strength.

(Example) Examples are shown below.

A mixed resin solution of bisphenol A type epoxy resin, alicyclic acid anhydride curing agent, and accelerator is used as the resin, and E glass fiber is impregnated with this resin and cut into an appropriate size.
(eye [jffl-300Il!/m2) ,,I
4; and cloth (weight - 320 g/river 2) are used as the commercial resin. A mold release agent is applied to the core mold 1 for forming the pipe joint, and the concave part (branch deformation part 2), small part 43 in the center is applied.
The inner layer 11 is formed by laminating an appropriate amount of reinforced resin around the
This inner layer] 1 was held and fixed between the release-treated half wooden molds 8.9 and cured in a curing oven at 130'C for 1 hour, and then the half wooden molds were removed.

Next, the inner layer 1 is wrapped around the end core mold 3 of the molding core mold 1, the socket forming portions 31, 41 of the branch core mold 4, and the inner layer 11 using a foramen 1 winding device (not shown). ] Glass roving (count -2310g/km) impregnated with the same resin used for molding
It wrapped around the rice and covered the entire surface. After fiber canting and removing the support shaft 6.7 from the filament winding device, it was cured at 130'C for 2 hours and demolded to produce a reinforced resin pipe joint.

(Effects of the Invention) According to the method of the present invention, an inner layer is formed in advance to have the same outer shape as the socket part on the outer periphery of the central recessed part having the branch deformed part of the molding core type of the pipe joint, and then this Continuous reinforcing fibers are tightly wound around the inner layer and the outer periphery of the socket forming part using the filament winding method, and then hardened to manufacture reinforced resin pipe joints.

Since the molding is done by machine winding, the product can be made homogeneous, and the resulting product has very high strength against internal pressure, and the inner dimensional accuracy of the socket part is also good. Particularly in the case of cheese, etc., it is excellent to prevent weaving by constructing the inner layer, which has a large strain change with respect to internal pressure, with a mat or cloth made of a resin layer or reinforcing fibers impregnated with resin.

[Brief explanation of drawings]

FIG. 1 is a front view of a molding core used in the cheese manufacturing process according to an embodiment of the present invention, FIG. 2 is a perspective view illustrating a part of the manufacturing process of the present invention, and FIG. FIG. 3 is a cross-sectional view illustrating a pipe joint manufactured by the method. 1 - Molding core mold 2 - Main body core mold 3 One end core mold 4 = Branch core mold 5 - End cap
6=Support shaft 11-Inner layer 2-Outer layer Patent applicant Hiroshi Sekisui Chemical Co., Ltd. Representative ■1 Kaoru 12: Outer layer

Claims (1)

[Claims] In a method for manufacturing a reinforced resin pipe joint using a molding core mold that forms a concave part having a branch deformed part in the center and connects to the branch deformed part to form an enlarged diameter socket part. , after molding an inner layer of resin or reinforced resin on the outer periphery of the concave portion in advance and curing or semi-curing the inner layer,
A reinforced resin molding material is supplied to the inner layer and the outer periphery of the socket forming part of the molding core by a filament winding method to form an outer layer, and after curing, the molding core is removed. A manufacturing method for reinforced resin pipe joints.