JPH0459513B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mold for integrally molding a T-shaped joint pipe, and particularly to a mold for integrally molding a T-shaped joint pipe made of composite reinforced plastic.

[Prior art]

Conventionally, various methods have been adopted to manufacture T-shaped joint pipes made of composite reinforced plastics (hereinafter abbreviated as FRP).

FIG. 1 shows the most typical combination T-tube of the same diameter with a bellmouth type joint and a specific example of manufacturing the same, and shows a schematic vertical cross-sectional view of the T-tube,
1 and 1' are the tube body cut pieces, 2 and 2' are the bell mouth type joints, 3 is the reinforcing layer of the T-tube joint, 4 is the tube body contact piece adhesive joint, and φ _d is the inner diameter of the tube. , φ _D indicates the inner diameter of the tip of the bellmouth type joint, and l indicates the length of the joint portion of the joint.

Hereinafter, a method for manufacturing a conventional T-shaped joint pipe will be explained based on FIG. When forming a T-shaped joint pipe, first cut the pipe body to desired dimensions, and then cut one end of the pipe body cut piece that will become the branch pipe 1' and both ends of the pipe body cut piece 1 to which the branch pipe will be joined. A bell mouth joint part 2', 2 is formed by performing a taper process that matches the external taper of the joint part of the pipe to be joined to the T-shaped pipe, and then the pipe body cut piece 1 to which the branch pipe 1' is joined. A hole with the same diameter as the inner surface of the cut pipe piece 1' that will become the branch pipe is made in the center of the pipe, and a hole is made on the opposite end of the cut pipe piece 1' where the bell mouth joint part 2' is provided. After applying a curved surface processing (polishing) to the end so as to match the hole made in the tube cut piece 1, the curved part of the tube cut piece 1' and the hole in the tube cut piece 1 are polished. A chamfering process is performed to form an adhesive joint (butt part) 4 on the section, and then the adhesive joint of the tube section 1' is inserted into the chamfered hole of the tube section 1, and the adhesive is applied. At the same time, a resin-impregnated fiber cloth or the like is laminated on the outside of the adhesive joint to form a reinforcing layer 3 of the pipe joint, thereby manufacturing a T-shaped joint pipe with a bellmouth joint. Ta.

FIG. 2 is a schematic vertical cross-sectional view showing a specific example of a conventional combination T-shaped pipe of the same diameter having a tapered convex joint instead of the bellmouth joint shown in FIG. 1, 3, 4, φ _d and l have the same meanings as shown in FIG. 1, and 5, 5' indicates the outer diameter of the tapered convex joint portion φ _D indicates the outer diameter of the tip of the tapered joint portion.

The forming of the T-shaped joint pipe shown in Fig. 2 consists of the pipe body 1,
After cutting pipe 1' to desired dimensions, the pipe body to be used for piping is attached to one end of the pipe cut piece 1 that will become the branch pipe 1' and to both ends of the pipe body cut piece 1 to which the branch pipe 1 will be joined. A tapered joint part 5' having the same shape as the inner surface of the tapered joint part,
5, and then forming a T-shaped joint pipe in the same manner as described with reference to FIG.

The conventional method described above involves processing the curved surface of the end of the pipe that will become the branch pipe 1' and chamfering the curved surface processing portion, or drilling a hole in the center of the tube cut piece 1 and chamfering the hole portion, Not only is it necessary to perform troublesome processing such as forming a reinforcing layer on the joints of the tubes, but there is also a problem with the strength of the joints.

Moreover, as shown in FIG. 4, the bell mouth joint part 2
Conventionally, integrally molded T-joint pipes with the same diameter of The T-shaped pipe is made by laminating resin-impregnated fiber cloth on the outer surface of a mold that has the same diameter as the inner diameter of the integral T-shaped joint pipe made by the same diameter. ,
The use of complicated split molds, the creation of molds using molten metal, and the creation of disposable foamed resin molds or wooden molds are difficult and troublesome work, and the arcuate curved surface at the intersection of T-shaped pipes is difficult to manufacture. Not only can the dimensional accuracy and smoothness of the molds not be expected, but the molds also have problems with their durability, workability, etc.

[Purpose of the invention]

The present invention is a new mold for making an integrally molded T-shaped joint pipe, etc., particularly a mold for manufacturing a T-shaped integrally molded joint pipe, etc. that has an arcuate curved part at the T-shaped intersection. The purpose is to provide a type.

[Structure of the invention]

The present invention provides a T-shaped hollow rubber elastic body whose outer surface has the same diameter as the inner surface of a T-shaped joint pipe and an arcuate outer surface at the intersection, and a T-shaped hollow rubber elastic body inserted into the inside of the rubber elastic body. This is a mold for integrally molding a T-shaped joint tube, which is made of a removable mold, and has a mold for forming a joint part removably provided at the end of the central mold.

As explained earlier, T-shaped joint pipes are divided into two types: combined T-shaped joint pipes and integrally molded T-shaped joint pipes, but the durability and reliability of the piping material,
In particular, in order to improve the durability and reliability of piping systems used under high temperature and high pressure, it is necessary to use secondary adhesives and adhesives as much as possible.
It is desirable to avoid joints and, therefore, for T-fitting pipes, it is preferable to
It can be said that the preferable shape from the structural point of view is a shaped tube with an arcuate curved portion at the intersection of the tubes.

However, as mentioned before, it is difficult and troublesome to make an integrally molded T-tube, such as using complicated split molds, molten metal molds, or disposable foam resin molds or wooden molds. In addition to requiring extensive manufacturing work, the accuracy and smoothness of the arc-shaped curved surface of the T-shaped pipe intersection part could not be expected, and there were also problems with the durability and workability of the mold.

Therefore, the present inventors have developed a T-shaped joint pipe that is easy to integrally mold, has a curved part at the intersection of the pipes, has high dimensional accuracy of the curved part, and has excellent smoothness. While conducting various research on the manufacture of T-shaped joint pipes, the present invention was completed.

Next, the present invention will be explained in detail based on FIG. FIG. 3 shows a schematic vertical cross-sectional view of a mold for manufacturing a T-shaped joint of the same diameter, which has a bellmouth-shaped joint and has an arcuate curved part at the T-shaped pipe intersection part, and shows a schematic longitudinal cross-sectional view of a mold for manufacturing a T-shaped joint of the same diameter, which has a bellmouth-shaped joint and has an arcuate curved part at the T-shaped pipe intersection part.
1 is a bell mouth joint mold, 12, 12' is a core mold, 13 is a T-shaped hollow elastic body, 14 is a screw hole for attaching or removing the bell mouth joint mold, 14' is a core mold 12 is a screw hole for attaching the same 12', 15 and 15' are screw insertion holes,
Reference numeral 16 indicates a curved portion provided on the outer surface of the intersection of the T-shaped hollow elastic body.

To assemble the mold of the present invention, first insert the core mold 12 for attaching two bell mouth joint molds into the rubber elastic body 13, and then insert the core mold 12 for attaching one bell mouth joint mold. The screw insertion opening 15' of the core mold 12' and the core mold 1 for inserting the core mold 12' and joining the core molds 12' and 12 together.
After aligning the threaded holes 14' of 2, they are joined by screws, and then the screw insertion opening 15 of the bell mouth joint mold 11 and the core mold 12 are inserted into the core mold 12 protruding from the rubber elastic body 13. The bell mouth joint part mold 11 is inserted so that the screw holes 14 of the bell-mouth joints are aligned with each other, and the two are joined with screws.

Note that the position and number of screw holes are not particularly limited, and usually 1 to 2 screw holes are used to connect the core molds together, and 4 to 8 screw holes are used to connect the core mold and the bell mouth joint mold 11. It is preferable to use

In addition, the length of the core mold was made to protrude from the rubber hollow elastic body in order to facilitate the removal of the rubber hollow elastic body after molding the T-shaped joint.
The core mold does not necessarily have to protrude.

After the assembly of the six molds shown in FIG. 3, which are integrated in this way, is completed, a predetermined cloth base material is impregnated with resin and wrapped around the molds, and is then processed by contact pressure molding, etc. It is possible to produce a T-shaped joint of the same diameter with a bellmouth type joint and an arcuate bend at the intersection of the tubes. The same-diameter T-shaped joint molded in this way is released from the mold after the resin has hardened, but when it is removed from the mold, it must first be removed from the bellmouth joint mold that has been joined to the core mold. In this case, after removing the screws that attach the bell mouth joint mold 11 to the core mold 12 or 12', insert the core mold through the screw insertion opening 15 provided in the bell mouth joint mold 11. Insert a screw with the same diameter as the screw hole 12 or 12' into the screw hole 14,
By pushing in the screw, the bellmouth joint mold 11 can be easily removed. next,
After removing the central screw that connects the core molds together, the core mold 12 is removed by screwing the hook into the threaded hole 14 of the core mold used for joining the bell mouth joint mold 11 and pulling it out. ' and 12 are removed. Thereafter, the T-shaped hollow elastic body 12 made of silicone rubber or the like can be easily taken out. FIG. 4 shows an integrally molded T-tube of the same diameter with a bellmouth type joint manufactured using the mold shown in FIG. 3. In FIG. 4, reference numeral 20 indicates a bellmouth type joint.

The thickness of the T-shaped hollow elastic body 12 depends on the diameter of the intended T-shaped joint pipe, but it should be of an appropriate thickness, for example, 3 to 5 mm or more, so that it can be easily removed. Bye.

In the above explanation, we have explained the mold for making the same diameter integrally molded T-tube with a bellmouth type joint.
When manufacturing a T-shaped joint pipe having a tapered convex joint, a mold for a tapered convex joint as shown in FIG. 5 may be used instead of the bellmouth joint mold. In FIG. 5, reference numeral 17 indicates a tapered portion for manufacturing a tapered convex joint, and reference numeral 15 indicates a screw insertion port for joining the mold to the central mold.

In this case, it is difficult to obtain a tapered portion with constant dimensions, but it is sufficient to manufacture a somewhat larger one and then cut it to a certain size.

Furthermore, in the above description, a mold for manufacturing an integrally molded T-shaped tube with a joint of the same diameter has been described, but T-shaped tubes having different diameters can also be manufactured using the same mold.

〔Effect of the invention〕

In the molding mold of the present invention, a removable core mold that matches the inner diameter of the T-shaped hollow monomer body is inserted into the inner surface of the T-shaped hollow monomer body, so that the shape does not deform during molding, and the molding can be easily performed. After finishing, by pulling out the core mold, the T-shaped hollow monomer body can not only be easily removed using its elasticity, but also
By attaching the joint part mold to the core mold, it is not only possible to easily integrally mold a T-shaped joint pipe, but also to improve the dimensional accuracy and smoothness of the T-shaped pipe intersection. It is possible.

[Brief explanation of the drawing]

Fig. 1 is a schematic vertical cross-sectional view of a conventional combination T-tube of the same diameter with a bellmouth type joint, and Fig. 2 is a schematic cross-sectional view of a combined T-tube of the same diameter with a tapered convex joint.
Fig. 3 shows an embodiment of the present invention, and is a schematic vertical cross-sectional view of a mold for manufacturing an integrally formed T-shaped pipe with a bellmouth type joint, and Fig. 4 shows a molded product using the mold shown in Fig. 3. FIG. 5 shows a schematic vertical cross-sectional view of an integrally molded T-shaped pipe with a bellmouth type joint, and FIG. 5 shows a mold for a tapered convex joint for forming a tapered convex joint. 1, 1'...Tube body cut piece, 2, 2'...Bellmouth type joint part, 3...T-tube joint part reinforcing layer, 4...
...Pipe body joint piece adhesive joint, 5, 5'...Tapered convex joint, 11...Bellmouth joint type, 1
2, 12'... Core mold, 13... T-shaped hollow elastic body, 14, 14'... Screw hole, 15, 15'...
...Screw insertion hole.

Claims (1)

[Claims] 1. A T-shaped hollow rubber elastic body whose outer surface has the same diameter as the inner surface of the T-shaped joint pipe and an arcuate outer surface at the intersection, and a removable tube inserted inside the rubber elastic body. A mold for integrally molding a T-shaped joint pipe, comprising a central mold, and a mold for forming a joint part is removably provided at the end of the central mold.