JP2003191325A - Method for working radially enlarged faucet of tube with inner and outer smooth waves - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a flat rigidity of a rubber ring faucet from decreasing by not collapsing a rib, to surely connect a spigot of a tube to the faucet by reducing unevenness of an inner diameter of the faucet, and to surely hold watertightness of the faucet by the rubber ring by mounting the ring at the faucet having a smooth inner surface. <P>SOLUTION: A method for working a radially enlarged faucet of a tube with inner and outer smooth waves comprises the step of removing an outer layer 26 formed on an end 12d of the tube 50 with the inner and outer smooth waves. The method further comprises the steps of heating the end 12d of the tube in which the layer 26 is removed to a temperature of softening point lower than a melting point. The method also comprises the step of forming the rubber ring faucet 14 by radially enlarging the end 12d of the tube. Thus, since the end 12d of the tube is radially enlarged in a state in which the layer 26 is removed, a rib 18 is not collapsed by the layer 26. Since the rib 18 is not collapsed, an inner peripheral surface 14a of the faucet 14 can be formed smooth. Accordingly, the unevenness of the inner diameter of the faucet 14 is reduced. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a diameter-increasing receiving end of a pipe with smooth wave inside and outside, and is particularly used for drainage pipes for expressways or drainage pipes laid in residential land or parks. The present invention relates to a method for processing a diameter-increasing receptacle of a pipe with smooth wave inside and outside.

[0002]

2. Description of the Related Art Although there has been no conventional method for processing the expanded diameter receiving port of a pipe with smooth wave inside and outside, a processing method shown in FIGS. 10 to 12 is conceivable. This processing method is shown in FIG.
As shown in (1), first, the tube 4 with inner and outer surface smooth waves is prepared.
The tube 4 is a tube made of synthetic resin in which the corrugated layer 3 is formed between the inner layer 1 and the outer layer 2. Then, the tube end 4a is heated to a temperature equal to or higher than the softening point and lower than the melting point. Next, FIG.
As shown in (B), the expansion / contraction die 5 is reduced in diameter and inserted into the tube end 4a. Then, as shown in FIG. 11 (A), the expansion / contraction die 5 in the reduced diameter state is brought into the enlarged diameter state, and the pipe end 4a.
Is spread from the inside to form the rubber ring receptacle 6. Then, after cooling the rubber ring receiving port 6, the expansion / contraction die 5 is reduced in diameter as shown in FIG. In this way, the processing of the rubber ring receiving port 6 shown in FIG. 12 is completed, and the inner and outer surface smooth corrugated tube 7 is completed.

[0003]

However, according to the conventional method for processing the diameter-increasing port of the inside / outside surface smooth corrugated pipe, when the expansion / contraction die 5 is expanded as shown in FIG. Moreover, the inner peripheral surface of the outer layer 2 is not directly expanded by the expansion / contraction die 5, but is expanded by the corrugated layer 3. When the expansion / contraction die 5 moves in the diameter expanding direction, the ribs 8 of the trapezoidal cross section of the corrugated layer 3 formed in the rubber ring receiving port 6 are separated by the outer layer 2
Is elastically crushed and inclined toward the tube body 4b side. In this state, the side wall 8a on the inclined side of each rib 8 is bent. Then, when the expansion / contraction die 5 is reduced in diameter and taken out from the rubber ring receiving port 6, as shown in FIG. 12, the rubber ring receiving portion 6a is included by the force of the bent side wall 8a of each rib 8 to expand. A large number of annular convex portions 1 a are formed on the inner peripheral surface of the rubber ring receiving opening 6.
As a result, annular irregularities are alternately formed on the inner peripheral surface of the rubber ring receiving opening 6.

As described above, when the rib 8 of the rubber ring receiving port 6 is crushed, there is a problem that the rigidity of the rubber ring receiving port 6, particularly the flat rigidity, is reduced. If irregularities are formed on the inner peripheral surface of the rubber ring receiving port 6, the variation of the inner diameter of the rubber ring receiving port 6 becomes large. In some cases, it cannot be joined to the rubber ring receptacle 6. When the rubber ring receiving portion 6a is formed with irregularities, the rubber ring 9 cannot be housed exactly, so that the water tightness of the rubber ring 9 may not be maintained.

Therefore, a main object of the present invention is to form a diameter-increasing receiving port having a smooth inner peripheral surface without crushing the corrugated layer at the tube ends of the inner and outer surface smooth corrugated tubes.
An object of the present invention is to provide a method for processing a diameter-increasing receiving port of a pipe with smooth wave inside and outside.

[0006]

The present invention is a processing method for forming a diameter-increasing receiving end at the tube end of an inner-outer surface smooth corrugated pipe in which a corrugated layer is formed between an inner layer and an outer layer. a) Prepare an inner and outer surface smooth wave tube without outer layer at the tube end, and (b) heat the tube end with heat 2
This is the processing method for the expanded diameter receiving port of the tube with smooth wave inside and outside, which is processed next to expand the diameter.

[0007]

Function: A tube with smooth waves on the inner and outer surfaces without an outer layer at the tube end is prepared. Then, the pipe end can be subjected to the secondary heat treatment to be expanded in diameter to form the expanded diameter receiving port. As described above, since the tube end without the outer layer is subjected to the secondary heat treatment to be expanded in diameter, the corrugated layer at the tube end is not crushed by the elastic force of the outer layer when expanding the diameter. In this way, since the corrugated layer is not crushed, the inner peripheral surface of the diameter-enlarged receiving port is formed smoothly without forming annular irregularities.

[0008]

According to the present invention, since the corrugated layer formed in the diameter-expansion receiving opening is not crushed during the diameter-expansion, the reduction of the rigidity of the diameter-expansion receiving opening, especially the flatness rigidity is prevented. it can. Further, since the inner peripheral surface of the inner layer of the diameter expansion receiving port can be formed to be smooth, it is possible to reduce the variation in the inner diameter of the diameter expansion receiving port. Therefore, the spout of the separately prepared inner and outer surface smooth wave-equipped tube can be exactly and surely joined to this expanded diameter receiving port as predetermined. When the rubber ring is attached to the expanded diameter receiving port, the inner surface is smooth, so that the rubber ring can be fitted exactly and the water tightness is surely maintained by the rubber ring.

The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for processing a diameter-increasing receptacle for a pipe with smooth inner and outer surfaces according to the first embodiment of the present invention, and a pipe with smooth inner and outer surfaces formed by the method (hereinafter, simply referred to as "tube"). 10) will be described with reference to FIGS. The tube 10 is a single-sided receiving tube having a cross-sectional shape as shown in FIG. 3 (B), and is made of synthetic resin such as polyethylene. It can be used as, for example, a drainage pipe for a highway or a pressureless drainage pipe laid in a residential land or a park, and includes a pipe body 12. At one end of the tube body 12, a rubber ring receiving port (hereinafter, also simply referred to as a “rubber ring receiving port”) 14 for a pipe with inner and outer smooth waves.
Are formed.

The rubber ring receiving port (expanding diameter receiving port) 14 is a cylindrical body having a circular cross section perpendicular to the tube axis, as shown in FIG.
As shown in, the inner layer 16 forming the tubular body is formed with a constant thickness. Then, one opening of the rubber ring receiving opening 14 is formed as an insertion opening into which the insertion opening 12a of another equivalent tube 10 is inserted, and the other opening is formed in the tube body 1
It is connected to the two ends. A rib 18 and a rubber ring receiving portion 20 are formed on the inner layer 16 forming the rubber ring receiving port 14.

The rubber ring receiving portion 20 is an annular groove formed along the inner peripheral surface of the inner layer 16 and has a rubber ring 22 and a pressing member 24 mounted therein. As shown in FIG. 4, the rubber ring 22 has a rubber ring receiving port 14 and an outlet 12a of another tube 10
This is for maintaining the watertightness of this joint in the state where the joint is joined. The pressing member 24 is the rubber ring receiving portion 20.
The hanger portion of the rubber ring 22 is pressed against the inner peripheral surface of the rubber ring receiving portion 20 in a state where the rubber ring 22 is fused. by this,
When inserting the outlet 12a of the pipe 10 into the rubber ring receiving port 14,
It is possible to prevent the rubber ring 22 from rolling in the insertion direction along with the insertion opening 12a. The pressing member 24 is a ring made of synthetic resin such as polyethylene.

As shown in FIG. 3 (B), the rib 18 is a protrusion formed in a spiral shape along the outer peripheral surface of the inner layer 16 of the rubber ring receiving port 14 and protrudes outward. And, the cross-sectional shape orthogonal to the circumferential direction is substantially trapezoidal,
The inside is hollow. The ribs 18 are formed at a pitch where, for example, five cross sections appear in the cross-sectional view of the rubber ring receptacle 14. Since the rib 18 is formed on the rubber ring receiving port 14 in this manner, the rigidity of the rubber ring receiving port 14, particularly the flat rigidity, can be increased.

Further, as shown in FIG. 4, the rubber ring receiving port 14
With the pipe 10 joined to the pipe, the inner surface 12b of the pipe body 12 of the left pipe 10 in the figure and the inner surface 12b of the pipe body 12 of the right pipe 10 in the figure are connected smoothly without a step. The inner diameter of the mouth 14 is defined. As a result, it is difficult for wastewater to be collected in the abutting portion between the pipe bodies 12 and for dust to be caught. The joint between the rubber ring receiving port 14 and the end of the tube body 12 is formed by the inner layer 16.

As shown in FIG. 5, the tube body 12 has an outer layer 26 and an inner layer 16 each formed in a cylindrical shape, and a corrugated layer 28 formed between the outer layer 26 and the inner layer 16.
, Which are connected to each other to form one body.

The inner layer 16 is a cylindrical body having a predetermined thickness formed by spirally winding the first strip 30 at a pitch B, and its inner surface 12b is smooth. Then, the side edges 30 of the first strips 30 adjacent to each other
a is coupled via the second strip 32. The corrugated layer 28 is formed by hollow ribs 18 provided along the longitudinal direction of the first strip 30. This rib 1
Since the sectional shape of 8 is trapezoidal, the sectional shape of the corrugated layer 28 appears wavy. By increasing the thickness of the wall portion of the rib 18, particularly the thickness of the upper wall 34, the flat rigidity of the tube body 12 can be increased. And rib 1
By making 8 hollow, a lightweight and highly rigid tube body 12 can be provided. The outer layer 26 is a cylindrical body having a predetermined thickness formed by spirally winding the third strip 36, and the outer surface 12c thereof is smooth.

Next, referring to FIGS. 1 to 3, FIG.
Rubber ring socket (expansion socket) of the tube 10 with smooth wave inside and outside shown in
The processing method of 14 will be described. First, as shown in FIG. 1 (A), a tube 50 with an inner and outer surface smooth wave having the same configuration as the tube body 12.
To prepare. Then, as shown in FIG.
The outer layer 26 of the portion corresponding to the rubber ring receiving opening 14 formed in 2d is peeled off and removed. Next, the tube end 12d from which the outer layer 26 has been peeled off is heated to a temperature equal to or higher than the softening point and lower than the melting point (thermal secondary processing). Then, as shown in FIG. 2 (A), the expansion / contraction die 38 is inserted into the opening of the tube end 12d in a reduced diameter state. Next, as shown in FIG. 2 (B), the expansion / contraction die 38 in the reduced diameter state is expanded to the pipe end 12
The rubber ring receptacle 14 is formed by pushing d from the inside. Then, after the rubber ring receiving port 14 is cooled, the expansion / contraction die 38 is reduced in diameter as shown in FIG.
Take out from. In this way, the tube 10 with smooth wave inside and outside
The processing of the rubber ring receiving port 14 is completed. After that, Fig. 3
As shown in (B), the rubber ring 22 is attached to the rubber ring receiving portion 20, and the pressing member 24 is fused. This is rubber ring 2
The inner / outer surface smooth wave-equipped tube 10 to which 2 is mounted is completed.

As shown in the front view of FIG. 2 and the sectional view of FIG. 6, the expansion / contraction die 38 is made up of, for example, eight die members 38a, and the diameter reduction shown in FIG. The configuration is such that the state can be expanded and contracted to the expanded state shown in FIG. The expansion / contraction die 38 has a substantially cylindrical outer shape in a diameter-expanded state, and has an annular ridge 3 at the substantially center along the outer periphery.
8b is formed. The protrusion 38b is for forming the rubber ring receiving portion 20. The outer peripheral surface 38c of the expansion / contraction die 38 other than the protrusions 38b has the rubber ring receiving port 1
4 for forming the inner peripheral surface other than the rubber ring receiving portion 20. This expansion / contraction die 38 includes eight die members 38a.
Are expanded and contracted by being guided in the radial direction and moving outward or inward, and the diameter in the expanded state is about 1.4 times the diameter in the contracted state.

When the expansion / contraction die 38 in the expanded state shown in FIG.
The one mold member 38a is moved to the inner position as indicated by the solid arrow. Next, the four mold members 38a having a shape narrowing toward the inside may be moved to the inside position as indicated by the dashed arrow. Then, when the expansion / contraction die 38 in the diameter-reduced state is to be in the diameter-enlarged state, the procedure reverse to the above procedure may be performed. That is, first, the four mold members 38a having a shape narrowing toward the inside are moved to the outside position shown in FIG. Next, the four mold members 38a having a shape expanding toward the inside may be moved to the outside position shown in FIG.

The rubber ring receiving port 1 of the tube 10 with smooth wave inside and outside
According to the processing method of No. 4, as shown in FIG. 2, the pipe end 12d from which the outer layer 26 has been removed is subjected to the secondary heat treatment to be expanded in diameter, so that the rib (corrugated layer) of the pipe end 12d is expanded at the time of expansion. 28) 18 is not crushed by the elastic force of the outer layer 26.
As described above, since the rib 18 is not crushed, the inner peripheral surface 14a of the rubber ring receiving port 14 is smooth without forming an annular unevenness unlike the conventional rubber ring receiving port 6 shown in FIG. Is formed.

Since the ribs 18 formed on the outer peripheral surface of the rubber ring receiving port 14 are not crushed during the expansion of the diameter, it is possible to prevent the rigidity of the rubber ring receiving port 14, particularly the flat rigidity, from being lowered. . Further, since the inner peripheral surface 14a of the inner layer 16 of the rubber ring receiving port 14 can be formed smoothly, the variation in the inner diameter of the rubber ring receiving port 14 can be reduced.
Therefore, as shown in FIG. 4, the inlet 12a of the separately prepared inner and outer surface smooth wave-equipped tube 10 can be joined to the rubber ring receptacle 14 exactly and surely as predetermined. Further, since the inner surface of the rubber ring receiving portion 20 is also smooth, the rubber ring 22 can be housed exactly, and the water tightness is surely maintained by the rubber ring 22.

Further, according to the pipe body 12, as shown in FIG. 5, the inner surface 12b is formed smoothly by the strip portion 30b of the first strip body 30, so that the flow resistance in the pipe body 12 is small. Therefore, the drainage and debris that flow down do not stay. The corrugated layer 28 is formed by the hollow ribs 18 of the first strip 30, and the space 40 is formed between the spirally wound ribs 18 and the ribs 18. In addition to the light weight of the pipe body 12, the rigidity, particularly the flat rigidity, is high. Further, since the outer surface 12c is formed smoothly by the third strip-shaped body 36,
This also makes it possible to increase the flat rigidity of the tube body 12 and also increase the bending strength of the tube body 12.

When forming the sewage and drainage pipes by using the pipe 10 with smooth inner and outer surfaces shown in FIG. 3 (B), as shown in FIG. The tube 10 may be sequentially joined by inserting it into the rubber ring receiving opening 14 of the tube 10. Of course, if necessary for repair or the like, the joint 12a of one of the pipes 10 to be joined to each other can be pulled out from the rubber ring receiving port 14 of the other pipe 10 to separate them.

As described above, the pipe 10 has the rubber ring receiving port 1
Since 4 is provided, it is possible to sequentially join without using a separate joint, and the piping work can be performed easily. Then, the outlet 12a of one pipe 10 is connected to the other pipe 10
Since the both can be joined by inserting them into the rubber ring receptacle 14, the joining work of the inner and outer surface smooth corrugated pipe 10 can be performed very easily and in a short time even for a beginner. The watertightness can be reliably maintained by the rubber ring 22.

Further, since the rib 18 is formed in the rubber ring receiving port 14 to enhance the rigidity of the rubber ring receiving port 14, especially the flat rigidity, the rubber ring receiving portion 20 and the rubber ring 2 are provided.
The deformation of No. 2 can be reduced, and the watertightness can be reliably maintained.

The size of the rubber ring receiving port 14 of the inner and outer surface smooth corrugated pipe 10 is about 815 when the nominal diameter is 600.
mm, the outer diameter of the tube body 12 is about 700 mm, and the inner diameter is about 60
The thickness of the tube wall of the tube body 12 is about 50 mm, and the pitch of the ribs 18 of the corrugated layer 28 is about 73 mm.

Next, referring to FIGS. 1 and 7 to 9, etc., a method for processing the expanded diameter receiving port of the inner and outer surface smooth corrugated tube of the second embodiment of the present invention, and the method for processing the same are formed. Tube with smooth wave inside and outside (hereinafter sometimes simply referred to as "tube") 42
Will be explained. The difference between the processing method of the first embodiment and the processing method of the second embodiment is that in FIG.
As shown in (B), the rubber ring receiving portion 2 is provided in the rubber ring receiving port 14.
While 0 is formed, in the second embodiment, as shown in FIG.
As shown in (B), the rubber ring receiving portion 20 is not formed in the receiving port 44.

As shown in FIG. 8B, the inner and outer surface smooth corrugated tube 42 formed by the processing method of the second embodiment has the inner layer 16 of the receiving port 44 formed in a cylindrical shape. A rubber ring 46 is attached to the opening edge that forms the insertion port of the receiving port 44. The rubber ring 46 is formed with a flange portion 46a that spreads outward from one side edge, and is formed with three annular lips 46b on the inner peripheral surface. The rubber ring 46 is attached to the opening edge of the receiving port 44, and the outer peripheral surface thereof is in close contact with the inner peripheral surface 44a of the receiving port 44, and the flange portion 46a is engaged with the opening edge of the receiving port 44. is doing.

The tube 4 with smooth wave inside and outside shown in FIG. 8 (B)
When using 2 to form sewage, drainage pipe, first
As in the case of the embodiment, as shown in FIG. 9, the inlet 12a of the one pipe 42 may be inserted into the receiving port 44 of the other pipe 42 to sequentially join the pipes 42. However, the inner peripheral surface 44 of the socket 44
The diameter of the inner peripheral surface 44a of the receiving opening 44 is made slightly larger than the diameter of the outer peripheral surface of the outlet 12a so that the rubber ring 46 can be interposed between a and the outer peripheral surface of the outlet 12a. .
Other than this, the pipe is the same as the pipe 10 of the first embodiment, the same portions are denoted by the same reference numerals, and detailed description thereof will be omitted.

Next, referring to FIGS. 1, 7 and 8,
A method of processing the receiving opening (expansion receiving opening) 44 of the pipe 42 with smoothed inner and outer surfaces shown in FIG. 8B will be described. First, as in the first embodiment, as shown in FIG. 1A, an inner / outer surface smooth wave-equipped tube 50 having the same structure as the tube body 12 is prepared. And FIG.
As shown in (B), the receptacle 44 formed at the tube end 12d
The outer layer 26 of the portion corresponding to is peeled off and removed. next,
The tube end 12d from which the outer layer 26 has been peeled off is heated to a temperature equal to or higher than the softening point and lower than the melting point (secondary thermal processing). Then, as shown in FIG. 7 (A), the expansion / contraction die 48 is inserted into the opening of the tube end 12d in a reduced diameter state. Next, as shown in FIG. 7 (B), the expansion / contraction die 48 in the reduced diameter state is expanded to push the tube end 12d from the inner side to form the receiving opening 44. Then, after cooling the receiving port 44, FIG.
As shown in (A), the expansion / contraction die 48 is reduced in diameter and taken out from the receiving port 44. In this way, the processing of the receiving port 44 of the inner and outer surface smoothed tube 42 is completed. After that, Fig. 8
As shown in (B), the rubber ring 46 is attached to the opening edge of the receiving port 44. This completes the inner and outer surface smoothed tube 42 with the rubber ring 46 attached.

The expansion / contraction die 48 of the second embodiment has a first
The ridge 38b is removed from the expansion / contraction die 38 of the embodiment. Then, as shown in FIG. 7, it is composed of eight mold members 48a, and the reduced diameter state shown in FIG.
The configuration is such that it can be expanded and contracted to the expanded state shown in FIG. 7 (B). The expansion / contraction die 48 has a cylindrical outer shape in a diameter-expanded state, and the outer peripheral surface 48 b of the expansion / contraction mold 48 causes the inner peripheral surface 44 of the receiving port 44 to be formed.
a is formed.

According to the processing method of the receiving port 44 of the inner and outer surface smooth corrugated pipe 42, the rib (corrugated layer 28) 18 of the pipe end 12d becomes the outer layer 26 when the diameter is expanded, as in the first embodiment. The inner peripheral surface 44a of the receiving port 44 can be formed smoothly without being crushed by the elastic force. Therefore, it is possible to prevent the rigidity of the receiving port 44, particularly the flat rigidity, from decreasing. Then, as shown in FIG. 9, the outlet 12a of the separately prepared inner and outer surface smoothing wave-equipped tube 42 can be joined to this receptacle 44 exactly and surely as predetermined. Since the inner peripheral surface 44a of the opening edge of the receiving port 44 is also smooth, the rubber ring 46 can be fitted tightly, and the watertightness is reliably maintained by the rubber ring 46.

However, in the first and second embodiments, FIG.
As shown in (A), an inner / outer surface smooth wave-equipped tube 50 in which the outer layer 26 is formed up to the tube end 12d is prepared, and as shown in FIG. Outer layer 2
6 was peeled off and removed, and thereafter, the pipe end 12d was subjected to thermal secondary processing to form the receiving ports 14 and 44. Instead, the outer layer 26 at the pipe end 12d portion was formed. An inner and outer surface smooth wave-equipped tube (not shown) is prepared, and thereafter, the tube end 12d on which the outer layer 26 is not formed is subjected to thermal secondary processing to receive the receptacles 14 and 44.
May be formed.

In the processing methods of the first and second embodiments, as shown in FIG. 1A, the inner and outer surface smooth corrugated tube 50 having a relatively long length is processed to form the receiving ports 14 and 44. Although the inner and outer surface smooth wave-equipped tubes 10 and 42 provided are formed, in place of this, a relatively short length inner and outer surface smooth wave-equipped tube can be processed into a manhole joint having the receiving ports 14 and 44. . When this manhole joint is attached to the wall portion of the manhole, the end portion of the pipe body may be inserted and fixed in the attachment hole formed in the wall portion.

Further, in the first and second embodiments, the inner / outer surface smooth wave-equipped tube 50 shown in FIG. 1 and the like is used, but an inner / outer surface smooth wave-equipped tube having a configuration other than this may be used. In short, the inner and outer surface smooth corrugated pipe may be a pipe in which the inner and outer surfaces 12b and 12c are smooth and the corrugated layer 28 has a corrugated cross-sectional shape. For example, in the first and second embodiments, the first,
Although the inner and outer surface smooth wave-equipped tube 50 formed by spirally winding the second and third strips 30, 32, 36 is used,
Instead of this, the first, second and third strips 30, 3
You may use the pipe | tube with a smooth wave inside and outside formed by winding 2 and 36 circularly one by one. Each rib 18 forming the corrugated layer of this tube is an annular body formed at a predetermined pitch.

Further, in the first and second embodiments, FIG.
And the expansion and contraction molds 38 and 48 shown in FIG.
Other expansion / contraction molds may be used. In short, in the reduced diameter state, for example, the tube 5 with inner and outer surface smooth waves shown in FIG.
It can be inserted into the tube end 12d of No. 0, and the tube end 12d can be expanded by expanding the diameter to form the rubber ring receptacle 14 or the receptacle 44.

[Brief description of drawings]

FIG. 1 (A) is a partial cross-sectional view showing an inner / outer surface smooth wave-equipped tube used in a method of processing a diameter-increasing port of an inner / outer surface smooth wave-equipped tube according to a first embodiment of the present invention, and FIG. 1 (A) is a partial cross-sectional view showing a state in which the outer layer at the tube end of the inner and outer surface smooth wave-equipped tube is removed and heated.

FIG. 2A is a diagram showing a processing method of the first embodiment.
FIG. 2B is a partial cross-sectional view showing a state in which the expansion / contraction mold is inserted into the tube end of the inner and outer surface smooth wave tube, and FIG. 2B is an inner / outer surface showing the expanded / contracted mold in FIG. It is a fragmentary sectional view of a tube with a smooth wave.

FIG. 3A is a view showing a processing method of the first embodiment.
FIG. 3B is a partial cross-sectional view of the inner and outer surface smooth corrugated tube showing a state where the expansion / contraction die is reduced in diameter, and FIG. 3B is a state in which a rubber ring and a pressing member are attached to the rubber ring receiving portion of FIG. FIG. 6 is a partial cross-sectional view of a tube with smooth wave inside and outside.

FIG. 4 is a partial cross-sectional view showing a state in which a rubber ring receiving opening formed by the processing method of the first embodiment of FIG.

FIG. 5 is a partial enlarged cross-sectional view of a tube with smoothed inner and outer surfaces used in the processing method of the first embodiment shown in FIG. 1 (A).

FIG. 6 is a cross-sectional view showing a reduced diameter state of the expansion / contraction mold used in the first embodiment shown in FIG. 2 (A).

FIG. 7 (A) is a partial cross-sectional view showing a state in which the expansion / contraction mold used in the second embodiment of the present invention is inserted into the tube end of the inner / outer surface smooth corrugated tube of FIG. 1 (B). 7] is a partial cross-sectional view of the tube with smoothed inner and outer surfaces showing a state in which the expansion / contraction die of FIG.

FIG. 8A is a view showing a processing method of the second embodiment.
FIG. 8B is a partial cross-sectional view of the inner and outer surface smooth corrugated tube showing a state in which the expansion / contraction die is reduced in diameter, and FIG. 8B shows a state in which a rubber ring is attached to the opening edge of the receiving opening in FIG. 8A. It is a fragmentary sectional view of a pipe with smooth waves on the inner and outer surfaces.

FIG. 9 is a partial cross-sectional view showing a state in which an inlet of an inner / outer surface smooth corrugated tube is joined to a receptacle formed by the processing method of the second embodiment of FIG. 8B.

10 (A) is a partial cross-sectional view showing an inner / outer surface smooth corrugated tube used in a method of processing a diameter-expanding port of a conventional inner / outer surface smooth corrugated tube, and FIG. 10 (B) is a sectional view of FIG. 10 (A). It is a fragmentary sectional view showing the state where the expansion and contraction metallic mold was inserted in the tube end of the tube with an external smooth wave.

FIG. 11 (A) shows a conventional processing method.
11B is a partial cross-sectional view of a tube with smooth corrugated inner and outer surfaces showing a state in which the expansion / contraction die of FIG. 11 is expanded, and FIG. It is a fragmentary sectional view of a tube with a smooth wave.

FIG. 12 is a partial cross-sectional view showing an inner and outer surface smooth corrugated tube formed by a conventional processing method and another inner and outer surface smooth corrugated tube joined to the rubber ring receptacle.

[Explanation of symbols]

10, 42 ... Tube with smooth wave inside and outside 12… Tube body 12a ... 12b ... Inner surface of tube body 12c ... External surface of tube body 12d ... tube end 14… Rubber ring socket 14a ... Inner peripheral surface of rubber ring receiving port 16… Inner layer 18 ... Ribs 20 ... Rubber ring receiving part 22, 46 ... Rubber ring 26 ... Outer layer 28 ... corrugated layer 38,48 ... Expansion / contraction mold 38b ... ridge 44 ... 44a ... Inner peripheral surface of receptacle 50 ... Tube with smooth wave inside and outside

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshishige Akeboshi             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Inside the Tavinyl pipe factory F-term (reference) 4F209 AG03 AG08 AG10 AG23 AH43                       AM26 NA22 NB01 NJ10 NM02                       NN02

Claims (4)

[Claims] 1. A processing method for forming a diameter-increasing receiving port at a pipe end of an inner / outer surface smooth corrugated pipe in which a corrugated layer is formed between an inner layer and an outer layer, wherein (a) the outer layer is formed at the pipe end. (B) A method of processing a diameter-increasing receiving end of a tube with smooth wave inside and outside, in which the tube end is subjected to a secondary heat treatment to expand the diameter. 2. The method for processing a diameter-increasing receiving port of a pipe with a smooth corrugated inner and outer surfaces according to claim 1, wherein the outer layer is removed at the pipe end in the step (a). 3. The step of forming a diameter-increasing receptacle for an inner / outer surface smooth wave tube according to claim 1, wherein in the step (a), the inner / outer surface smooth wave tube having no outer layer formed at the tube end is prepared. Method. 4. The method for processing a diameter-increasing receptacle of an inner-outer surface smooth corrugated tube according to claim 1, wherein in step (b), the rubber ring receiving portion is formed at the same time.