JPH1137374A - Electro-fusion type piping member and manufacture of electro-fusion type piping member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electro-fusion type piping member of high producibility, by which the fusing work of an heating wire is unnecessary, and to provide a method for manufacturing the same. SOLUTION: A main body part has the shape of a short pipe having two openings, and a heating wire 7 such as a nichrome wire or the like, is buried in an inner face near the openings. Both edges of the heating wire 7 are connected with a terminal 10. Three ring bodies 20, 21, 22 are integrated inside of the main body part, and the heating wire 7 is closely mounted among the ring bodies 20, 21, 22. Further the ring bodies 20, 22 near the openings, comprise the holes, and a root part 31 of the terminal 10 and an edge part of the heating wire 7 are inserted into the holes together.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrofusion type piping member represented by an electrofusion joint. The present invention also relates to a method for manufacturing an electro-fusion type piping member.

[0002]

2. Description of the Related Art An electric fusion joint is known as a member for connecting pipes such as a gas pipe and a water supply. Electric fusion joints
It is a short-tube-shaped synthetic resin piping member in which a heating wire is embedded in the inner surface of the opening and two connection terminals are exposed in the outer peripheral portion. Then, in the electric fusion joint, a thermoplastic resin tube is inserted into the opening portion, electricity is supplied between the connection terminals to generate heat, and a part of the tube and the electric fusion joint are melted to join the two. .

[0003] The production of the electrofusion joint is performed using an injection mold having a built-in rod-shaped core. That is, the coated heating wire is wound around the core of the molding die, and the core is accommodated in the injection molding die with terminals connected to both ends of the heating wire. Also, when storing the core in the injection mold,
The terminal is fixed to a core core or a part of the outer mold by a predetermined jig. In this state, the molten resin is injected into the molding die, and the resin is filled into the molding cavity formed between the core core and the outer die. The molten resin flows in the mold, fills the periphery of the heating wire, forms a predetermined short tube-shaped main body, and integrates the main body with the terminal and the heating wire. After the resin is cooled and solidified, the molding die is divided, and the electric fusion joint in which the heating wire is embedded in the inner surface of the opening of the short tubular resin is removed.

[0004]

As described above, in the electric fusion joint, a heating wire is buried on the inner surface side of the tube. It is not necessary to embed a heating wire on the inner surface of the part. Also, for reasons such as ensuring the quality of the joint, the inner surface of the central part of the pipe is
Rather, the heating wire should not be buried. Therefore, the heating wire is wound around only the portions corresponding to the vicinity of the openings at both ends of the core, and the intermediate portion of the core is provided with a bridging portion where the heating wire is not wound. That is, when the heating wire is wound around the core core, the heating wire is densely wound around a portion corresponding to one opening, and when the winding of the portion is completed, the heating wire is extremely loosely wound and the heating wire is wound around the other opening side. And the heating wire is tightly wound again from the site.
Then, the heating wire is densely wound up to a portion immediately near the other opening.

For this reason, in the prior art, it is necessary to perform a welding process between adjacent heating wires to fix the position of the heating wire after or during the winding of the heating wire around the core. That is, as described above, since the heating wire has a sparsely wound portion in the middle portion, the heating wire is loosened at the portion, and the heating wire in the densely wound portion is disturbed. Even if the heating wire is wound without disturbing, when the core is put into the mold and the resin is filled, the heating wire is pushed by the flow of the resin, and the winding position of the heating wire is shifted.

Specifically, the fusing process is performed for the purpose of preventing the winding start portion, the winding end portion, the transfer start portion, and the transfer end portion from coming loose, and preventing the generation of a gap between adjacent heating wires in the fusion portion. There are 8 to 10 processing target locations for one electrofusion joint. Each time the fusion process is performed, operations such as positioning of a fusion target portion, operation of the fusion heat plate, and fusion of the heating wire coating are required. In addition, it takes time to recover the temperature of the fusion hot plate.
Therefore, in the conventional method for manufacturing an electric fusion joint, there is a problem that the fusion work step is rate-determining in manufacturing and productivity cannot be increased.

Therefore, the present invention focuses on the above-mentioned problems of the prior art, and an object of the present invention is to develop an electrofusion-type piping member which does not require a welding operation of a heating wire during production and has high productivity. Things. Another object of the present invention is to develop a method for manufacturing an electrofusion-type piping member with high productivity.

[0008]

According to a first aspect of the present invention, there is provided an apparatus having two or more openings to which other piping members are connected, and a heating wire provided on an inner surface of the opening. In the electrofusion type piping member in which is embedded, a ring body is embedded in the vicinity of the opening and an intermediate portion between the openings, and a heating wire is arranged between the ring bodies. It is a piping member.

In the electrofusion type piping member of the present invention, a ring body is buried in the vicinity of the opening and in an intermediate portion between the openings, and a heating wire is arranged between the ring bodies. That is, in the electrofusion type piping member of the present invention, the ring body is buried in the middle bridging portion around which the heating wire is sparsely wound. Therefore, when the heating wire is wound around the core at the time of manufacturing, the heating wire can be wound uniformly around the core. In addition, since the winding start position, the winding end position, the transfer start position, and the transfer end position are each determined by the ring body, there is no need to fuse the heating wire during manufacturing.

A second aspect of the present invention for achieving the same object.
The invention described in (1) has an opening to which another piping member is connected, a heating wire is buried in the inner surface of the opening, and a terminal connected to the heating wire is exposed to the outside. In the pipe member, a ring body having a hole in the periphery is buried at a position adjacent to the buried portion of the heating wire, and in a hole in the periphery of the ring body,
A part of the terminal and a part of the heating wire are inserted together, and the terminal engages with the ring body and is in contact with the heating wire.

The main purpose of the present invention is to prevent fraying of a heating start portion and a winding end portion of a heating wire. That is, in the electrofusion type piping member of the present invention, the ring body having a hole in the peripheral portion is buried in a position adjacent to the buried portion of the heating wire. And are inserted together. Therefore, the heating wire is fixed in a state sandwiched between the terminal and the hole, and does not fray when wound or when filled with resin.

According to a third aspect of the present invention to achieve a similar object, the invention has two or more openings to which other piping members are connected, and a heating wire is buried in the inner surface of the openings. In the electrofusion type piping member in which the terminal connected to the heating wire is exposed to the outside, a ring body is buried in the vicinity of the opening and in an intermediate portion between the openings, and the heating wire is arranged between the ring bodies. A hole is provided in a peripheral portion of at least one of the ring bodies, and a part of the terminal and a part of the heating wire are inserted into the hole in the peripheral part of the ring body together. An electric fusion type piping member which is engaged and is in contact with a heating wire.

An electrofusion type piping member according to the present invention is a composite of the first and second aspects of the present invention. In the electrofusion pipe member of the present invention, since the ring body is buried in the intermediate bridging portion where the heating wire is sparsely wound, the heating wire can be evenly wound around the core, and Since a part of the terminal and a part of the heating wire are inserted together in the peripheral hole, the heating wire is fixed in a state sandwiched between the terminal and the hole, and when it is wound or filled with resin Never fray.

An invention related to a manufacturing method for achieving the same object is an electrofusion type piping member having two or more openings to which other piping members are connected, and a heating wire embedded in an inner surface of the opening. In the method of manufacturing, a step of attaching three or more ring bodies to a core core, a step of winding a heating wire between the ring bodies, and a step of placing a core body in which the ring body and the heating wire are arranged in a molding die And a step of filling a raw material resin in a molding die.

[0015] In the method for manufacturing an electro-fusion type piping member according to the present invention, three or more rings are mounted on the core, and a heating wire is wound between the rings. Therefore, the heating wire does not fray during the winding operation, and the fusing operation as in the prior art is unnecessary. In addition, since the heating wire can be wound evenly, the winding operation is also easy. Furthermore, in the present invention, the core body on which the ring body and the heating wire are arranged is arranged at a predetermined position in the molding die, and the raw resin is filled in the molding die. The heating wire is fixed and does not shift due to the flow of the resin.

According to a fifth aspect of the present invention for achieving the same object, there is provided an opening to which another piping member is connected, wherein a heating wire is embedded in an inner surface of the opening, and In a method of manufacturing an electrofusion type piping member in which connected terminals are exposed to the outside, a step of mounting a ring body having a hole in a peripheral portion to a core core, and a heating wire adjacent to the ring body And, at least at the beginning or end of winding of the heating wire, insert a part of the terminal and a part of the heating wire together into a hole in the peripheral portion of the ring body to engage the terminal and the ring body. Combining the terminal and the heating wire with the heating wire, arranging the ring core and the core provided with the heating wire at a predetermined position in the molding die, and filling the molding resin with the raw resin. Of an electrofusion type piping member characterized by comprising: It is a method.

In the method for manufacturing an electrofusion type piping member according to the present invention, a part of the terminal and a part of the heating wire are inserted together into a hole in a peripheral portion of the ring body at the start of winding of the heating wire. And the ring are engaged with each other, and the terminal and the heating wire are brought into contact with each other. Therefore, the heating wire is fixed in a state sandwiched between the terminal and the hole, and does not fray when wound or when filled with resin. In addition, since the terminal is engaged with and fixed to the ring body, the positioning of the terminal is easy when the core is disposed in the molding die.

According to another aspect of the present invention, there is provided an electric power tool having two or more openings to which other piping members are connected, and a heating wire embedded in an inner surface of the openings. In a method for manufacturing a fusion-bonded piping member, a step of attaching three or more ring bodies including a ring body having a hole in a peripheral part to a core core; a step of winding a heating wire between the ring bodies; A part of the terminal and a part of the heating wire are inserted together into a hole in the peripheral portion of the ring body at least at the beginning or end of winding of the heating wire to engage the terminal with the ring body, and the terminal and the heating wire And a step of arranging a core in which a ring body and a heating wire are disposed at a predetermined position in a molding die, and a step of filling a raw material resin in the molding die. This is a method for manufacturing an electro-fusion type piping member.

The method of manufacturing an electro-fusion type pipe member according to the present invention is a combination of the above-described fourth and fifth aspects. That is, in the manufacturing method of the electrofusion type piping member of the present invention, three or more rings are attached to the core, a heating wire is wound between the rings, and the ends of the heating wires are connected to the terminal and the hole. Since it is fixed in a sandwiched state, the heating wire does not fray when winding or filling with resin. Also, inside the molding die, since the end and the intermediate portion of the heating wire are held by the ring body, the heating wire is not frayed by filling with the resin. Further, since the terminal is fixed by engaging with the ring body, positioning of the terminal is easy when the core is disposed in the molding die.

[0020]

Embodiments of the present invention will be described below. FIG. 1 is a cross-sectional view of an electro-fused piping member according to an embodiment of the present invention. FIG. 2 is a perspective view of a core used when manufacturing the electrofusion pipe member of FIG. 1, and shows a state in which a ring is attached to the core and a heating wire is wound. FIG. 3 is a perspective view of a ring body at an intermediate portion employed in the electrofusion pipe member of the embodiment of FIG. 1 and a perspective view of a ring body of a modified example thereof. FIG. 4 is an enlarged perspective view showing a main part of FIG. FIG. 5 is a cross-sectional view of a mold for manufacturing the electro-fused piping member of FIG. FIG. 6 is a perspective view corresponding to FIG. 4 in another embodiment of the present invention. FIG. 7 is a perspective view and a sectional view corresponding to FIG. 4 in another embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes an electrofusion type piping member according to an embodiment of the present invention. The electrofusion type piping member 1 of the present embodiment is specifically an electrofusion joint. The electrofusion joint 1 of the present embodiment is made of a thermoplastic resin such as polypropylene resin, polyethylene resin, or vinyl chloride resin, and the main body 2 has a short tube shape and has two openings. 5 and 6. In the electric fusion joint 1, a heating wire 7 such as a nichrome wire is embedded in the inner surface near the openings 5, 6. Further, both ends of the heating wire 7 are connected to terminals 10, 1
1 connected. The terminals 10 and 11 have their roots buried in the main body 2 and their distal ends exposed to the outside. The periphery of the exposed portions of the terminals 10 and 11 is protected by a tubular portion 13.

The difference between the electrofusion joint 1 of the present embodiment and that of the prior art is that the ring members 20, 21 and 22 are built in the vicinity of the opening inside and in the middle, and the heating wire 7 is
The point is that they are densely arranged between the ring bodies 20, 21, 22. Another feature is the ring 2 near the opening.
The point is that holes are provided at 0 and 22 and the roots of the terminals 10 and 11 and the end of the heating wire 7 are inserted together in these holes.

Hereinafter, the characteristic structure of the electro-fusion joint 1 according to the present embodiment and its operation and effect will be described in accordance with the manufacturing process of the electro-fusion joint 1.

In manufacturing the electric fusion joint 1 of the present embodiment,
A core 25 as shown in FIG. 2 is used. Core core 25
Can be divided into two parts in the longitudinal direction (the divided structure is not shown), and has a columnar portion for forming the inner surface of the electrofusion joint 1 in an integrated state. Then, in the manufacturing method of the present embodiment, as the first step, the three ring bodies 20, 21, 22 are mounted on the columnar portion. Here, the ring members 20 and 22 at both ends are made of a thermoplastic resin such as a polypropylene resin, a polyethylene resin, or a vinyl chloride resin, and are annular members substantially corresponding to the outer diameter of the core 25. . In addition, ring bodies 20, 22
Are provided with small columnar projections 26 and 27 on the outer peripheral surface thereof, and a hole 28 is formed in the center of the projections 26 and 27.

The ring body 21 at the center is made of the same material as the ring bodies 20 and 22 at both ends, and is slightly wider than the ring bodies 20 and 22 at both ends. The ring member 21 at the center is a simple annular member as shown in FIGS. 2 and 3A, and has no projections or the like.

The gap between the ring members 20 and 22 at the end and the ring member 21 at the center is set to an integral multiple of the diameter (including the coating) of the heating wire 7.

As the next step, one of the ring bodies 2
The terminal 10 and the end of the heating wire 7 are inserted together into one hole 28. The terminal 10 is manufactured in a separate process in advance, and is made of a material having excellent electric conductivity such as copper.
It has a top style. Specifically, the terminal 10 is provided with a root portion 31 having substantially the same diameter as the hole 28, an intermediate portion 32 having substantially the same diameter as the projection 26, and a tip portion 33 which is thicker than the root portion 31 and thinner than the intermediate portion 32. It was done.

The heating wire 7 is covered with a resin. The heating wire 7 is stripped at its end to expose the metal wire, and is wound around the root 31 of the terminal 10 as shown in FIGS. In this state, the root 31 of the terminal 10 is inserted into the hole 28 on the outer periphery of the ring 20, and the terminal 10 is engaged with the hole 28 and fixed to the outer periphery of the ring 20.
The heating wire 7 is sandwiched between the inner surface of the hole 28 and the root 31 of the terminal 10, and the heating wire 7 is in close contact with the terminal 10.

Next, the core 25 is rotated, and the heating wire 7 is densely wound around the outer periphery of the core 25. That is, the heating wire 7 is inserted from the immediate vicinity of the ring body 20 and wound without opening a gap to densely fill the space between the ring body 21 and the middle part.
Then, the heating wire is sparsely wound on the ring body 21 in the middle part, and the heating wire is passed through the gap between the ring body 21 in the middle part and the ring body 22 in the other end part. Further, the heating wire 7 is similarly densely wound around a gap between the ring body 21 at the intermediate portion and the ring body 22 at the other end. And when it reaches the part of the ring body 22 at the other end,
The heating wire is cut, and the coating at the cut end is peeled off and wound around the root 31 of the terminal 10, and the root 31 of the terminal 10 is inserted into the hole 28 of the ring body 22 at the other end.

The state in which the heating wire 7 is wound up is as shown in FIG. 2. The winding start and end of the heating wire are positioned and fixed between the terminal 10 and the hole 28. Positioning and fixing are carried out by being sandwiched between the respective gaps between 21 and 22.

In this state, the core 25 is placed at a predetermined position on the mold 40. The molding die 40 is constituted by the above-mentioned core core 25 and two outer dies 41 and 42, which form a predetermined molding cavity.

Subsequently, the ring bodies 20 and 2 are placed in a molding die.
The same thermoplastic resin as the materials 1 and 22 is injected and filled.
Although the resin flows into the cavity of the mold 40, in the manufacturing method of the present embodiment, the heating wire 7 is fixed at both ends and an intermediate portion, so that the position does not shift even when pressed by the resin. In other words, according to the manufacturing method of the present embodiment, the closely wound portion of the heating wire 7 of the fusion portion to be fused to another piping member has the ring members 20 and 22 on the end portion and the ring member 21 on the center portion. Is set to a winding width determined by the outer diameter of the heating wire 7 and the number of windings, so that the heating wire is pushed by the flow of the resin during the injection molding without the fusion treatment of the heating wire 7 and the gap is formed. There is nothing you can do. Therefore, according to the present embodiment, the fusion processing for preventing the generation of the gap is unnecessary. In addition, since the transfer portion is wound while the start position and the end position are regulated by the ring body 21 at the center, the fusion process for preventing loosening is unnecessary.

When the filling of the resin is completed, the mold is cooled to solidify the resin, the outer dies 41 and 42 are opened, the core core 25 is taken out, and the core core 25 is further divided to form an electrofusion as a molded product. Detach the fitting 1.

In the embodiment described above, the core core 21 in the intermediate portion has a simple ring shape. The annular core like the present embodiment has an advantage that it is easy to manufacture and is a recommended configuration. However, a configuration in which the positioning of the heating wire and the start position and the end position of the transition are more clearly determined. Alternatively, it is also possible to adopt a configuration in which a spiral shape is provided on the end face 51 as in the ring body 50 shown in FIG. It is also recommended that a groove 55 be provided on the peripheral surface as in the ring body 53 shown in FIG. 3 (c) and a heating wire be fitted into this groove.

The ring bodies 20, 21, 22 are connected to the core 25
As a method of attaching the ring bodies 20, 21, 22 to the core core 25 after forming the ring bodies 20, 21, 22 in advance by machining or injection molding, etc. It is also possible to insert the core core 25 into an injection mold and directly form the ring bodies 20, 21, 22 on the outer peripheral surface of the core core 25 by injection molding.

Further, as a modified example of the engagement structure between the terminal and the ring body, the configuration shown in FIGS. 6 and 7 can be considered. FIG.
In the embodiment shown in (1), the terminal 60 is provided with the groove 62 on the lower end surface of the root portion 61. In addition, ring body 20 (22)
The protrusion 65 is also provided with a groove 66 on the upper end surface. FIG.
In the embodiment shown in FIG. 2, the end of the heating wire 7 is
(22) is placed in the groove 66 of the protrusion 65,
2 is aligned with the direction of the groove 66 of the protrusion 65, and the terminal 6
The zero root 61 is pushed into the hole 28 of the ring body 20 (22). According to this configuration, the heating wire 7 is connected to the ring body 20 (2
The ring body 20 (2) is pushed into the hole 28 by being restricted by the groove 66 of the projection 65 and the groove 62 of the terminal 60 of 2).
2) and the contact with the terminal 60 is more reliable.

In the embodiment shown in FIG. 7, the terminal 70 has a tapered shape and a split groove 72 is provided. In the embodiment shown in FIG. 7, the end of the heating wire 7 is inserted into the split groove 72, and the root 71 of the terminal 70 is connected to the ring body 20.
Push into the hole 28 of (22). According to this configuration, FIG.
As shown in (b), the split groove 72 is closed inside the hole 28, and the contact between the terminal 70 and the heating wire 7 becomes more reliable.

In the above description, the method of fixing the ends of the heating wire 7 by the terminals 10, 60, 70 has been described. However, the heating wire 7 may be positioned by other means. On the contrary, it is also possible to utilize only a measure for fixing the end portion by the terminals 10, 60, 70, and to use a conventional measure for fixing the intermediate portion of the heating wire 7.

Further, in the above-described embodiment, an example in which the present invention is applied to a socket-type pipe joint has been described. It can be widely applied to a piping member having a connection portion with a piping or the like.

[0040]

EXAMPLE When an electrofusion joint was manufactured by the manufacturing method of the embodiment shown in FIGS. 2 to 5, the productivity was improved by about 25% as compared with the conventional manufacturing method.

[0041]

According to the first and third aspects of the present invention, there is provided a method for manufacturing an electro-fusion type pipe member according to the present invention. Since the ring body is embedded, when the heating wire is wound around the core, the heating wire can be evenly wound around the core. Further, in the electrofusion type piping member of the present invention, since the winding start position, the end position, the transfer start position, and the transfer end position are each positioned by the ring body, the fusion of the heating wire at the time of manufacturing is unnecessary. . Therefore, the method for manufacturing the electro-fusion type pipe joint and the electro-fusion type pipe member according to the present invention has an effect of increasing productivity as compared with the related art.

Further, in the method for manufacturing the electro-fusion pipe member according to the second and third aspects and the method for manufacturing the electro-fusion type pipe member according to the fifth and sixth aspects, the heating wire is inserted between the terminal and the hole. It is fixed and does not fray when wound or filled with resin. Therefore, the method for manufacturing the electro-fusion type pipe joint and the electro-fusion type pipe member according to the present invention has an effect of increasing productivity as compared with the related art. In addition, according to the present invention, there is an excellent effect that product quality can be stabilized because disconnection trouble can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an electro-fusion type piping member according to an embodiment of the present invention.

FIG. 2 is a perspective view of a core used for manufacturing the electrofusion type piping member of FIG. 1, showing a state in which a ring body is attached to the core and a heating wire is wound therearound.

3A and 3B are a perspective view of a ring body at an intermediate portion and a perspective view of a ring body according to a modification example of the ring body employed in the electrofusion piping member of the embodiment of FIG. 1;

FIG. 4 is an enlarged perspective view showing a main part of FIG. 2;

FIG. 5 is a cross-sectional view of a mold for manufacturing the electro-fused piping member of FIG.

FIG. 6 is a perspective view corresponding to FIG. 4 in another embodiment of the present invention.

FIG. 7 is a perspective view and a sectional view corresponding to FIG. 4 in another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric fusion joint 5, 6 opening 7 Heating wire 10 Terminal 20, 21 Ring body 22 Ring body 25 Core core 50, 53 Ring body 60, 70 Terminal

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI B29L 31:24

Claims (6)

[Claims] 1. An electrofusion type piping member having two or more openings to which another piping member is connected, and a heating wire embedded in an inner surface portion of the opening, wherein a portion near the opening and an intermediate portion between the openings. A ring member is embedded in the portion, and a heating wire is arranged between the ring members. 2. An opening to which another piping member is connected,
A heating wire is buried in the inner surface of the opening, and a terminal connected to the heating wire is exposed to the outside. A part of the terminal and a part of the heating wire are buried in an adjacent position, and a part of the terminal and a part of the heating wire are inserted together in a hole in a peripheral portion of the ring body, and the terminal is engaged with the ring body and is in contact with the heating wire. An electrofusion type piping member characterized by the above-mentioned. 3. An opening having two or more openings to which other piping members are connected, a heating wire is buried in an inner surface of the opening, and a terminal connected to the heating wire is exposed to the outside. In the electrofusion pipe member, a ring body is buried in the vicinity of the opening and an intermediate portion between the openings, and a heating wire is arranged between the ring bodies, and at least one of the ring bodies has a hole in the peripheral portion. Is provided, a part of the terminal and a part of the heating wire are inserted together into a hole in a peripheral portion of the ring body, and the terminal engages with the ring body and is in contact with the heating wire. Electrofusion type piping member. 4. A method for manufacturing an electro-fusion type pipe member having two or more openings to which other piping members are connected, and a heating wire embedded in an inner surface of the opening, wherein three or more ring bodies are provided. Mounting a heating wire between the ring body, a step of winding a heating wire between the ring bodies, a step of arranging the core body on which the ring body and the heating wire are arranged at a predetermined position in a molding die, Filling the inside with a raw material resin. 5. It has an opening to which another piping member is connected,
In a method of manufacturing an electrofusion pipe member in which a heating wire is buried in an inner surface portion of the opening and a terminal connected to the heating wire is exposed to the outside, a ring body having a hole in a peripheral portion is formed as a core. A step of attaching the heating wire to the core, a step of winding a heating wire adjacent to the ring body, a part of a terminal and a heating wire in a hole in a peripheral portion of the ring body at least at the start or end of winding of the heating wire. A step of inserting a part together to engage the terminal with the ring body and bring the terminal and the heating wire into contact with each other, and placing the core body on which the ring body and the heating wire are disposed at a predetermined position in the mold. A method for producing an electro-fusion type pipe member, comprising a step of disposing and a step of filling a raw material resin in a molding die. 6. A method for manufacturing an electro-fusion type piping member having two or more openings to which other piping members are connected, and a heating wire embedded in an inner surface of the opening, wherein a hole is formed in a peripheral portion. A step of mounting three or more ring bodies including a ring body having the core core, and a step of winding a heating wire between the ring bodies,
At least at the beginning or end of winding of the heating wire, a part of the terminal and a part of the heating wire are inserted together into a hole in the peripheral part of the ring body to engage the terminal with the ring body, and A step of contacting the heating wire, a step of arranging the ring body and the core core on which the heating wire is arranged at a predetermined position in the molding die, and a step of filling the raw material resin in the molding die. A method for producing an electro-fusion type piping member.