JPH05164282A - Manufacture of branch joint and heating device used therefor - Google Patents

Abstract

PURPOSE:To connect a main pipe and a branch pipe simply and reliably without using blow formation and drawing work, by heating and melting V-grooves in the main pipe and angle portions of the branch pipe separately, and pressing the melted V-grooves and angle portions in the axial direction of the branch pipe so that they become fusion-welded together. CONSTITUTION:To fabricate a branch pipe joint, V-grooves 11 having a right-angled bottom are formed in two places in the wall of the main pipe 1, with their bottoms about 180 deg. apart each other along the circumference of the main pipe 1. Then angle portions 21 having a right-angled peak are formed in two places at an edge of a branch pipe 2 which is identical in diameter with the main pipe 1, with their peaks about 180 deg. apart each other along the circumference of the branch pipe 2. Following this, the end surface of each of the V-grooves 11 and angle portions 21 is heated and melted. Then, the V-grooves 11 and the angle portions 21 are fitted to an angle attachment 33 and a groove attachment 32, respectively, which are arranged on both sides of a heater in a heating device 31. After this, the end surfaces of the melted V-grooves 11 and angle portion 21 are connected together by fusion-welding under pressure applied in the axial direction of the branch pipe 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a branch pipe joint in which a main pipe and a branch pipe have the same diameter, and a heating device used in the manufacturing method.

[0002]

2. Description of the Related Art Conventionally, as a general method for manufacturing a branch pipe joint, there are a method using drawing, a method using blow molding, and a method using welding.

In the method using the drawing process, first, a through hole is formed in a local portion of the main pipe, and the peripheral portion of the through hole is heated and softened. Next, a mold having a flat upper surface is inserted from the open end of the main pipe, and the member hooked on the mold is pulled out from the through hole and pulled to form a flat portion having a flat upper surface at the peripheral portion of the through hole. .. Then, the branch pipe is inserted into the through hole of the flat portion and fixed by fitting or adhering (see JP-A-48-62868).

In the method using blow molding, a flat portion is formed by blow molding at a local portion of the main pipe that has been softened by heating, and a through hole slightly larger than the outer diameter of the branch pipe is formed in the flat portion. Then, a branch pipe is inserted through the through hole and fixed by fitting or adhering (Jitsuko Sho 58-295).
(See Japanese Patent Publication No. 5).

Further, in the method using welding, a through hole is formed in the pipe wall of the main pipe, and one end of the branch pipe is cut into a shape corresponding to the through hole to be processed, and the branch pipe is formed in the through hole of the main pipe. It is a method of butt welding the ends of the. In this case, the main pipe and the branch pipe are often made of glass fiber reinforced plastic (FRP).

[0006]

However, the above conventional manufacturing method has the following problems.

First, in the method using the drawing process, since it is necessary to form a flat surface wider than the outer diameter of the branch pipe on the pipe wall of the main pipe, a branch pipe joint having the same diameter as the main pipe and the branch pipe is manufactured. Not applicable in some cases.

Further, in the method using blow molding, the center of the local portion of the main pipe softened by heating is first stretched at the time of blow molding, and then the periphery thereof is gradually stretched to form a flat portion. It Therefore, a branch pipe joint is manufactured in which the root portion of the branch pipe that is most easily loaded and requires strength is the thinnest.

Further, the method using welding requires a high level of skill for welding, and therefore the fixing strength of the branch pipe cannot be stably obtained unless it is an expert. Also, it is very time-consuming.

In the present invention, the main pipe and the branch pipe have the same diameter, the strength of the root of the branch pipe is not inferior to that of the other portions, and the branch pipe has a predetermined strength. It is an object of the present invention to provide a method capable of manufacturing a branch pipe joint fixed to a main pipe.

[0011]

In order to achieve the above-mentioned object, the method for manufacturing a branch pipe joint according to the first aspect of the present invention has a V-shaped groove having a bottom at a right angle on the pipe wall of the main pipe and an outer periphery of the main pipe. Almost 1
A main pipe processing step in which the bottom is located at two positions that are 80 degrees apart, and a ridge with a right angle at the top is formed at the end of the branch pipe having the same diameter as the main pipe. After performing a branch pipe processing step of forming the peaks at two distant points, a heating and melting step of heating and melting the end face of the V-shaped groove of the main pipe and the end face of the chevron portion of the branch pipe is performed. After the heating and melting step, a method of performing a fusion step of applying pressure to the end surface of the V-shaped groove of the main pipe and the end surface of the crest portion of the branch pipe by applying pressure in the pipe axis direction of the branch pipe is adopted.

The above method is not suitable for the main pipe cutting process.
Point e on the outer circumference of the main pipe at two points 180 degrees apart₁ , E₂ 
And these two points e₁ , E₂ From the main tube axis C-C
For any angle θ₃(Θ₃ In the direction of <90)
Point f at the position where the outer circumference is moved 90 degrees₁ And take both points
e₁ , E₂ From the pipe axis C-C_Four (90-
θ₃) Point f at the position where the outer circumference of the pipe wall is moved 90 degrees in the direction of₂
 Take point e₁ , E₂ , F ₁ The arc connecting the points and point e
₁ , E₂ , F₂ Straighten the pipe wall of the main pipe along the arc connecting
To form a V-shaped groove in the branch pipe cutting process.
Points g at two points 180 degrees apart on the outer circumference of the pipe₁ , G₂ And
Both these points g₁ , G₂ To the pipe axis DD of the branch pipe
Then the angle θ₃ The outer circumference of the tube wall was moved 90 degrees in the direction of
Point h at position₁ And both points g₁ , G₂ From the tube axis
Θ with respect to D-D_Four (90-θ₃ ) To the outer circumference of the pipe wall
Point h to the position moved 90 degrees₂ Take the point h₁ , G₁ ，
g₂ The arc connecting the points and the point h₂ , G₁ , G₂ Arcs connecting
Cut the end of the branch pipe straight along to form a peak
Therefore, a highly accurate branch pipe joint can be manufactured.

In the heating and melting step of the above manufacturing method,
It is preferable to use a heating device in which a heater is provided with a grooved attachment having a V-shaped groove having a right angled bottom and a chevron attachment having a mountain portion having a right angled top.

Further, in a method for manufacturing a branch pipe joint according to a fourth aspect of the present invention, the above manufacturing method is further advanced, and a pipe wall of the main pipe is provided with:
A main pipe processing step of forming a V-shaped groove having a right angled bottom so that the bottoms are located at two positions on the outer periphery of the main pipe that are separated by approximately 180 degrees;
A branch pipe processing step of forming a mountain portion having an apex slightly sharper than a right angle at an end portion of the branch pipe having the same diameter as the main pipe so that the apex is located at two positions on the outer circumference of the branch pipe and separated by about 180 degrees. After performing the heating and melting step of heating and melting the end face of the V-shaped groove of the main pipe and the end face of the chevron portion of the branch pipe, after this heating and melting process, the end face of the V-shaped groove of the melted main pipe A method of performing a fusing step of fusing the end face of the mountain portion of the branch pipe by applying pressure in the pipe axial direction of the branch pipe.

The above-mentioned method is used in the main pipe cutting step.
Point e on the outer circumference of the main pipe at two points 180 degrees apart₁ , E₂ 
And these two points e₁ , E₂ From the main tube axis C-C
For any angle θ₃(Θ₃ In the direction of <90)
Point f at the position where the outer circumference is moved 90 degrees₁ And take both points
e₁ , E₂ From the pipe axis C-C_Four (90-
θ₃) Point f at the position where the outer circumference of the pipe wall is moved 90 degrees in the direction of₂
 Take point e₁ , E₂ , F ₁ The arc connecting the points and point e
₁ , E₂ , F₂ Straighten the pipe wall of the main pipe along the arc connecting
To form a V-shaped groove in the branch pipe cutting process.
Points g at two points 180 degrees apart on the outer circumference of the pipe₁ , G₂ And
Both these points g₁ , G₂ To the pipe axis DD of the branch pipe
Then the angle θ₃ The outer circumference of the tube wall was moved 90 degrees in the direction of
Point h at position₁ And both points g₁ , G₂ From the tube axis
The angle θ with respect to DD_Four The outer circumference of the pipe wall in the direction of
Point h at the moved position₂ And the point g₁ , G
₂ From the point h on the outer circumference of the pipe wall in the pipe axial direction.₁ , H₂ From
The point i is moved to a position that has moved a small distance to the side₁ , I₂ And
Point h₁ , I₁ , I₂ The arc connecting the points and the point h₂ , I
₁ , I₂ Straightly cut the end of the branch pipe along the arc connecting the
By forming the ridge, the branch pipe joint with high accuracy can be manufactured.
Wear.

In the heating and melting step of the above manufacturing method,
If a heater is used, a groove-shaped attachment having a V-shaped groove having a bottom that is slightly acuter than a right angle and a mountain-shaped attachment having a mountain portion having a right angled peak are used. Good.

[0017]

In the manufacturing method according to the first and the fourth aspects of the present invention, the wall thickness of the main pipe and the branch pipe is not partially thinned by not performing blow molding or stretching. Further, since the work requiring high technology such as welding is not performed, the branch pipe can be fixed to the main pipe with a substantially constant fixing strength even by an unskilled person.

Further, in the manufacturing method according to the second and fifth aspects, since θ ₃ and θ ₄ can be set arbitrarily, the branch pipe can be fixed to the main pipe in any direction.

Furthermore, when the heating apparatus according to claim 3 is used in the heating and melting step of the manufacturing method according to claim 1, and in the heating and melting step of the manufacturing method according to claim 4, the heating apparatus according to claim 6 is used. When used, the V-shaped groove of the main pipe is aligned with the mountain portion of the mountain-shaped attachment, and the mountain portion of the branch pipe is aligned with the groove-shaped attachment. Then, the end surface of the V-shaped groove and the end surface of the mountain portion can be completely melted at once, and the end surface of the V-shaped groove and the end surface of the mountain portion can be simultaneously heated, so that uniform melting can be achieved. You can get the status.

Further, in the manufacturing method according to the fourth aspect, in the fusing step, the end surface of the V-shaped groove and the end surface of the mountain portion of the branch pipe which are melted are pressed in the pipe axial direction of the branch pipe. When applied and fused, the highest pressure acts between the bottom of the V-shaped groove and the top of the crest. Therefore, the fixing strength of the portion where the load is most likely to be applied and water leakage is likely to occur can be maximized.

[0021]

First, a first embodiment will be described with reference to FIGS.

FIG. 1 is a side view of a branch pipe joint according to the first embodiment. This branch pipe joint has a branch pipe 2 having the same diameter (R ₁ = R ₂ ) as the main pipe 1 on the pipe wall of the main pipe 1. Are projected at right angles to the main pipe 1.

2 to 5 are explanatory views of a method for manufacturing the branch pipe joint, which includes a main pipe processing step described later,
This is a method in which a branch pipe processing step, a heating and melting step, and a fusing step are sequentially performed. Either the main pipe working process or the branch pipe working process may precede, or may be carried out simultaneously.

(A) Main pipe machining step In this process, the V-shaped groove 11 having a right angle at the bottom is formed on the pipe wall of the main pipe 1.
Are formed so that the bottoms are located at two places on the outer circumference of the main pipe 1 that are separated by 180 degrees.

That is, first, a point a ₁ is set on the outer circumference of the main pipe _1, and a point a ₂ is set at a position moved from this point a _{1 in the} pipe axis AA direction by a distance equal to the outer diameter of the branch pipe 2. .. Then, from these two points a ₁ and a ₂ to the point b ₁ at a position where the outer circumference of the tube wall is moved 90 degrees in the direction of θ ₁ (45 degrees) with respect to the tube axis AA, both points are taken. Pipe axis A from a ₁ and a ₂
-90 to the outer circumference of the pipe wall in the direction of θ ₂ (45 degrees) with respect to -A.
The point b ₂ is set at the moved position. Then, a straight cut is made from the point a ₁ to the points b ₁ and b _2, and a straight cut is made from the point a ₂ to the points b ₁ and b ₂ to form the V-shaped groove 11 (see FIG. 3). ).

Here, when cutting the pipe wall, in order to prevent the cut surfaces in the two directions from intersecting at the points b ₁ and b ₂ , the blade is made to follow the blade having a corner having a right angle. It is good to disconnect. Also, the case of cutting with a disc blade or a saw blade has been described, but if a blade having a right angle is used for punching, the cutting can be performed more easily so that the cut surfaces do not intersect.

(B) Branch pipe processing step In this process, a ridge portion 21 having a right angle at the apex is formed at the end of the branch pipe 2 having the same diameter as the main pipe 1 at a distance of about 180 degrees from the outer circumference of the branch pipe 2. Form so that the top is at the point.

First, points c ₁ and c ₂ are set at two positions on the outer circumference of the branch pipe 2 which are 180 degrees apart from each other, and from these two points c ₁ and c _{2 with} respect to the pipe axis BB of the branch pipe 2. The angle θ ₁ (45
Point ₁ at the position where the outer circumference of the pipe wall is moved 90 degrees in the direction of
At the same time, the point d ₂ is set at a position where the outer circumference of the tube wall is moved 90 degrees from the points c ₁ and c _{2 in} the direction of the angle θ ₂ (45 degrees) with respect to the tube axis BB. Then, from point d ₁ to point c
_1, with the aim of c ₂ with cutting straight, cut straight from point d ₂ aims to point c _1, c _2, to form the peak portion 21 (see FIG. 2).

(C) Heating and Melting Step In this step, the heating device 3 heats and melts the end face of the V-shaped groove 11 of the main pipe 1 and the end face of the mountain portion 21 of the branch pipe 2.

As shown in FIG. 4, the heating device 3 includes a groove-shaped attachment 32 in which a V-shaped groove 321 having a right-angled bottom is formed in a heater 31, and a mountain portion 33 having a right-angled top.
It is possible to use the one provided with the chevron attachment 33 on which 1 is formed.

That is, when the heating device 3 is used, the end face of the V-shaped groove 11 of the main pipe 1 is attached to the chevron attachment 3.
At the same time as matching and crimping to the mountain portion 331 of No. 3, branch pipe 2
The end surface of the mountain portion 21 of the V-shaped groove 3 of the groove-shaped attachment 32
The end face of the V-shaped groove 11 of the main pipe 1 and the end face of the crest 21 of the branch pipe 2 are heated for a predetermined time until the molten state is obtained.

(D) Fusing step In this step, the end faces of the V-shaped groove 11 of the main pipe 1 and the end faces of the crests 21 of the branch pipe 2 which are melted are matched with each other in a molten state,
Pressure is applied in the tube axis BB direction of the branch tube 2 to fuse them (see FIG. 5).

Next, the operation of the first embodiment will be described.

In the manufacturing method of the first embodiment, blow molding and stretching are not performed, so that the main pipe 1 and the branch pipe 2 are
The wall thickness of the branch pipe 2 does not become thin partially, and since the work requiring high technology such as welding is not performed, the branch pipe 2 can be fixed with a substantially constant strength even if it is not an expert.
Can be fixed to the main pipe 1.

In the heating and melting step, the heating device 3
Since the end surface of the V-shaped groove 11 and the end surface of the crest portion 21 are heated and melted by using, the end surface of the V-shaped groove 11 and the end surface of the crest portion 21 are completely melted at one time. , The end face of the V-shaped groove 11 and the end face of the mountain portion 21 can be heated at the same time to obtain a uniform molten state. Therefore, it is possible to manufacture a high-quality branch pipe joint in which the fixing strength of the branch pipe 2 is stable.

Next, a second embodiment will be described with reference to FIGS.

FIG. 6 is a side view of the branch pipe joint according to the second embodiment. This branch pipe joint has a branch pipe 5 of the same diameter (R ₄ = R ₅ ) as the main pipe 4 on the wall of the main pipe 4. Is provided so as to project at an angle of 60 degrees with respect to the main pipe 4.

7 to 10 are explanatory views of a method for manufacturing the branch pipe joint. This manufacturing method is a method in which a main pipe processing step, a branch pipe processing step, a heating and melting step, and a fusion bonding step, which will be described later, are sequentially performed. is there. In addition, the main pipe processing process and the branch pipe processing process,
Either may be preceded, or both may be performed at the same time.

(A) Main pipe processing step In this process, the V-shaped groove 41 having a right angle at the bottom is formed on the pipe wall of the main pipe 4.
Are formed so that the bottoms thereof are located at two positions on the outer circumference of the main pipe 4 that are separated by 180 degrees.

That is, first, the points e ₁ and e ₂ are set at two points on the outer circumference of the main pipe 4 which are 180 degrees apart from each other, and both points e ₁ and e ₂ are taken.
_The point f ₁ is set at a position where the outer circumference of the tube wall is moved 90 degrees in the direction of θ ₃ (60 degrees) from the tube axis C-C from ₁ and e ₂ , and both points e ₁ and e ₂ are Θ _{4 with} respect to tube axis C-C
A point f ₂ is set at a position where the outer circumference of the pipe wall is moved 90 degrees in the direction of (30 degrees). Then, straight cutting is performed from the point f ₁ toward the points e ₁ and e _2, and at the same time from the point f ₂ to the starting points e ₁ and e _2.
To form a V-shaped groove 41 (see FIG. 8).
reference).

(B) Branch pipe processing step In this process, a mountain portion 51 having an apex slightly sharper than a right angle is formed at an end portion of the branch pipe 5 having the same diameter as that of the main pipe 4, and an outer circumference of the branch pipe 5 of approximately 180 degrees. Form so that the peaks come at two places that are separated.

First, points g ₁ and g ₂ are set at two positions on the outer circumference of the branch pipe 5 which are 180 degrees apart from each other, and from these two points g ₁ and g _{2 with} respect to the pipe axis DD of the branch pipe 5. The angle θ ₃ (60
Point ₁ at the position where the outer circumference of the pipe wall is moved 90 degrees in the direction of
And the point h ₂ at a position where the outer circumference of the pipe wall is moved by 90 degrees from the points g ₁ and g _{2 in} the direction of the angle θ ₄ (30 degrees) with respect to the pipe axis BB, and , The points g ₁ and g ₂
From the above, points i ₁ and i ₂ are set at positions moved by a minute distance (preferably 5 mm or less) on the outer periphery of the tube wall in the tube axis direction to the side away from the h ₁ and h ₂ . Then, from the point h ₁ to the points i ₁ and i ₂
And cut straight at the same time, and from point h ₂ to point i
Straightly cut toward ₁ and i ₂ to form peaks 51 (see FIG. 7).

(C) Heating and melting step In this step, the heating device 6 heats and melts the end surface of the V-shaped groove 41 of the main pipe 4 and the end surface of the mountain portion 51 of the branch pipe 5.

As shown in FIG. 9, the heating device 6 includes a groove-shaped attachment 62 in which a V-shaped groove 621 having a bottom which is slightly sharper than a right angle is formed in a heater 61, and a mountain having a right angle top. A mountain-shaped attachment 63 having a portion 631 formed therein can be used.

That is, the end surface of the V-shaped groove 41 of the main pipe 4 is pressed against the peak portion 631 of the chevron-shaped attachment 63, and at the same time, the end surface of the crest portion 51 of the branch pipe 5 is fitted into the V-shaped groove 621 of the trough-shaped attachment 62. Match and crimp, V of main pipe 4
The end face of the groove 41 and the end face of the mountain portion 51 of the branch pipe 5 are heated for a predetermined time until a molten state is obtained.

(D) Fusion Step In this step, the end surface of the V-shaped groove 41 of the main pipe 4 and the end surface of the mountain portion 51 of the branch pipe 5 which are melted are matched with each other in a molten state, and the pipe axis of the branch pipe 5 is aligned. Pressure is applied in the D-D direction to cause fusion (Fig. 1
0).

Next, the operation of the second embodiment will be described.

In the manufacturing method of the second embodiment, blow molding and stretching are not carried out, so that the main pipe 4 and the branch pipe 5 are
The wall thickness of the branch pipe 5 does not become partially thin, and since the work requiring high technology such as welding is not performed, the branch pipe 5 can be fixed with a substantially constant strength even if it is not an expert.
Can be fixed to the main pipe 4.

In the heating and melting step, the heating device 6
Since the end surface of the V-shaped groove 41 and the end surface of the crest portion 51 are heated and melted by using, the end surface of the V-shaped groove 41 and the end surface of the crest portion 51 are completely melted at one time. The end face of the V-shaped groove 41 and the end face of the mountain portion 51 can be heated at the same time to obtain a uniform molten state. Therefore, it is possible to manufacture a high-quality branch pipe joint in which the fixing strength of the branch pipe 5 is stable.

In the manufacturing method of this embodiment, in the fusion bonding step, the main pipe 4 in which the bottom of the V-shaped groove 41 is formed at a right angle,
Since the apex of the mountain portion 51 is fused at a slightly sharper angle than the right angle, the branch pipe 5 is fused. Therefore, when the end face of the mountain portion 51 of the branch pipe 5 is pressed against the end face of the V-shaped groove 41 of the main pipe 4. , The highest pressure acts between the valley of the V-shaped groove 41 and the top of the crest 51. Therefore, it is possible to maximize the adhesive strength of the portion where the load is most likely to be applied and water leakage is likely to occur.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific structure is not limited to this embodiment, and there are design changes and the like within the scope not departing from the gist of the present invention. Also included in the present invention.

For example, in the embodiment, a method for manufacturing a branch pipe joint in which the branch pipe 5 is projected at right angles to the main pipe 4, and the branch pipe 5 is projected at an angle of 60 degrees with respect to the main pipe 4. Although the manufacturing method of the branch pipe joint described above has been described, these methods can also be applied to the manufacturing method of the branch pipe joint in which the branch pipe 5 projects from the main pipe 4 at other angles. In the case of manufacturing the one in which the angle of the branch pipe 5 with respect to the main pipe 4 is θ,
_{3 = θ / 2, θ 4} = 90-θ 3 from theta _3, the theta _4.

Also, a branch pipe joint may be manufactured by using a main pipe or a branch pipe having a receiving portion formed in its end portion in advance, or a main pipe or a branch pipe formed of a bent pipe. Good. 11 to 14 show some examples. That is, FIG. 11 shows a branch pipe joint manufactured using the main pipe 7 having the receiving portion 71 integrally formed at one end and the branch pipe 8 having the receiving portion 81 integrally formed at one end. 12 is a branch pipe 5 in which a socket 100 having a main pipe 7 having a receiving portion 71 integrally formed at one end and a receiving portion 110 having a diameter different from that of the receiving portion 71 of the main pipe 7 at one end is butt-fused. FIG. 13 shows a branch pipe joint manufactured by using a branch pipe consisting of a main pipe 7 having a receiving portion 71 integrally formed at one end and a bent pipe having a receiving portion 91 integrally formed at one end. 9 shows a branch pipe joint manufactured using No. 9 and FIG. 14 shows a branch pipe joint manufactured using a main pipe 10 made of a bent pipe integrally formed with receiving portions 101 at both ends.

[0054]

As described above, in the manufacturing method according to the first and fourth aspects, since the blow molding and the stretching are not performed, the wall thickness of the main pipe and the branch pipe is partially reduced. Since the work does not become thin, and the work that requires higher technology such as welding is not performed, the branch pipe can be fixed to the main pipe with substantially constant fixing strength even by an unskilled person. As a result, the main pipe and the branch pipe have the same diameter, the strength of the base of the branch pipe is not inferior to other parts, and the branch pipe joint in which the branch pipe is fixed to the main pipe with a predetermined strength is manufactured. In addition, it is possible to obtain the effect that the quality of the branch pipe joint can be stabilized.

Further, in the manufacturing method according to the second and fifth aspects, since θ ₃ and θ ₄ can be set arbitrarily, the branch pipe can be fixed to the main pipe in any direction.

Further, in the manufacturing method according to claim 4 of the present invention, in the fusing step, the end faces of the V-shaped grooves and the end portions of the crests of the branched pipe which are melted are moved in the axial direction of the branched pipe. When pressure is applied to fuse, the highest pressure acts between the bottom of the V-shaped groove and the top of the crest. Therefore, the fixing strength of the portion where the load is most likely to be applied and water leakage is likely to occur can be maximized, and a more accurate branch pipe joint can be manufactured.

Further, in the heating device according to claims 3 and 6 of the present invention, each of the end face of the V-shaped groove and the end face of the mountain portion can be completely melted at one time, and the end face of the V-shaped groove can be melted. Since the end faces of the ridges can be heated at the same time, a uniform molten state can be obtained. Therefore, by using this heating device in the heating and melting step in the manufacturing method of the present invention, it is possible to manufacture a high-quality branch pipe joint in which the fixing strength of the branch pipe is stable.

[Brief description of drawings]

FIG. 1 shows a branch pipe joint according to a first embodiment, (a)
Is a side view and (b) is a front view.

FIG. 2 is an explanatory view of a main pipe processing step in the manufacturing method, (a) is a side view and (b) is a front view.

FIG. 3 is an explanatory view of a branch pipe processing step in the manufacturing method, in which (a) is a side view and (b) is a front view.

FIG. 4 is an explanatory diagram of a heating and melting step in the manufacturing method.

FIG. 5 is an explanatory diagram of a fusing step in the manufacturing method.

FIG. 6 shows a branch pipe joint according to a second embodiment, (a)
Is a side view and (b) is a front view.

FIG. 7 is an explanatory diagram of a main pipe processing step in the manufacturing method, in which (a) is a side view and (b) is a front view.

FIG. 8 is an explanatory view of a branch pipe processing step in the manufacturing method, in which (a) is a side view and (b) is a front view.

FIG. 9 is an explanatory diagram of a heating and melting step in the manufacturing method.

FIG. 10 is an explanatory diagram of a fusion bonding process in the manufacturing method.

FIG. 11 is a side view showing a branch pipe joint.

FIG. 12 is a side view showing a branch pipe joint.

FIG. 13 is a side view showing a branch pipe joint.

FIG. 14 is a side view showing a branch pipe joint.

[Explanation of symbols]

 1 Main pipe 11 V-shaped groove 2 Branch pipe 21 Mountain part 3 Heating device 31 Heater 32 Groove type attachment 33 Mountain type attachment

Claims (6)

[Claims] 1. A main pipe processing step of forming a V-shaped groove having a right-angled bottom on a pipe wall of the main pipe so that the bottoms are located at two positions on the outer periphery of the main pipe that are separated by approximately 180 degrees, and the same diameter as the main pipe. At the end of the branch pipe, which is a peak with a right angle,
After performing a branch pipe processing step of forming the tops at two places apart from each other, a heating and melting step of heating and melting the end face of the V-shaped groove of the main pipe and the end face of the chevron portion of the branch pipe is performed. After this heating and melting step, a fusion step is performed in which the end surface of the V-shaped groove of the main pipe and the end surface of the mountain portion of the branch pipe which are melted are fused by applying pressure in the pipe axial direction of the branch pipe. Of manufacturing branch pipe joint. 2. In the main pipe cutting step, 1 of the outer circumference of the main pipe is used.
Point e at two locations 80 degrees apart₁ , E₂ Take these two points
e₁ , E₂ To an arbitrary angle with respect to the pipe axis C-C of the main pipe
θ₃ (Θ₃Move the outer circumference of the tube wall 90 degrees in the direction of <90)
To point f ₁ And both points e₁ , E₂ From the tube
Θ with respect to axis C-C_Four (90-θ₃ ) Direction outside the tube wall
Point f at a position moved 90 degrees around the circumference₂ Take point e₁ , E
₂ , F₁The arc connecting the points and point e₁ , E₂ , F₂ Tied
V-shaped groove is formed by cutting the wall of the main pipe straight along the arc.
However, in the branch pipe cutting process, the outer circumference of the branch pipe is separated by 180 degrees.
Point g at two points₁ , G₂ And these two points g₁ , G₂ 
From the angle θ with respect to the pipe axis DD of the branch pipe₃ In the direction of
Point h at the position where the outer circumference of the pipe wall is moved 90 degrees₁ Take
And both points g₁ , G₂ From the pipe axis DD_Four (9
0-θ₃ ) To the position where the outer circumference of the pipe wall is moved 90 degrees in the direction of
Point h₂ Take the point h₁ , G₁ , G₂ The arc and the point
h₂ , G₁ , G₂ Straighten the end of the branch pipe along the arc that connects
2. A ridge is formed by cutting directly.
A method for manufacturing the described branch pipe joint. 3. The heater is provided with a grooved attachment having a V-shaped groove having a right-angled bottom and a mountain-shaped attachment having a mountain portion having a right-angled top. Heating device. 4. A main pipe working step of forming a V-shaped groove having a right-angled bottom on a pipe wall of the main pipe so that the bottoms are located at two positions approximately 180 degrees apart from each other on the outer periphery of the main pipe, and the same diameter as the main pipe. After performing a branch pipe processing step of forming peaks at the ends of the branch pipe that are slightly sharper than a right angle so that the peaks come to two points on the outer circumference of the branch pipe that are approximately 180 degrees apart. A heating and melting step of heating and melting the end face of the V-shaped groove of the main pipe and the end face of the chevron portion of the branch pipe, and after the heating and melting process, the V of the melted main pipe
A method for manufacturing a branch pipe joint, which comprises performing a fusing step of fusing the end face of the groove and the end face of the mountain portion of the branch pipe by applying pressure in the pipe axial direction of the branch pipe. 5. In the main pipe cutting step, 1 of the outer circumference of the main pipe is used.
Point e at two locations 80 degrees apart₁ , E₂ Take these two points
e₁ , E₂ To an arbitrary angle with respect to the pipe axis C-C of the main pipe
θ₃ (Θ₃Move the outer circumference of the tube wall 90 degrees in the direction of <90)
To point f ₁ And both points e₁ , E₂ From the tube
Θ with respect to axis C-C_Four (90-θ₃ ) Direction outside the tube wall
Point f at a position moved 90 degrees around the circumference₂ Take point e₁ , E
₂ , F₁The arc connecting the points and point e₁ , E₂ , F₂ Tied
V-shaped groove is formed by cutting the wall of the main pipe straight along the arc.
However, in the branch pipe cutting process, the outer circumference of the branch pipe is separated by 180 degrees.
Point g at two points₁ , G₂ And these two points g₁ , G₂ 
From the angle θ with respect to the pipe axis DD of the branch pipe₃ In the direction of
Point h at the position where the outer circumference of the pipe wall is moved 90 degrees₁ Take
And both points g₁ , G₂ From the above angle with respect to the pipe axis DD
θ_Four Point h at the position where the outer circumference of the pipe wall is moved 90 degrees in the direction of₂ 
And the point g₁ , G₂ To the pipe wall in the pipe axis direction
The outer circumference of the point h₁ , H₂ Move a small distance to the side away from
Point i ₁ , I₂ Take the point h₁ , I₁ , I₂ To
Connected arc and point h₂ , I₁ , I₂ Along the arc connecting the
It is special to cut the end of the branch pipe straight to form a peak.
The method for manufacturing a branch pipe joint according to claim 4, wherein the branch pipe joint is manufactured. 6. The heater is provided with a grooved attachment having a V-shaped groove having a bottom that is slightly more acute than a right angle, and a chevron attachment having a mountain portion having a right angled peak. A heating device used in the manufacturing method according to claim 4 or 5.