JP2024036978A - Groove processing pipe and manufacturing machine thereof - Google Patents

Abstract

To provide a groove processing pipe which is superior in air tightness, water tightness and corrosion resistance and has high productivity, and to provide a manufacturing machine of the groove processing pipe.SOLUTION: A groove processing pipe using a galvanized steel pipe includes: a seal portion at the tip of a pipe material; and a groove at a depth side of the seal portion. In the seal portion, a galvanized layer is formed on a smooth surface by press rollers.SELECTED DRAWING: Figure 1

Description

The present invention relates to a grooved pipe used for piping connection and a manufacturing machine thereof.

Galvanized steel pipes are used for various types of piping.
As one type of piping connection, a groove consisting of a ring-shaped recess is formed on the outer periphery near the end of the pipe material, and a pair of groove pipes are arranged so as to butt each other, and the outer periphery of the abutting part is A groove type piping connection method is known in which a sealing member is arranged and the sealing member is tightened from both sides by a pair of half-shaped housing joints.
Therefore, if the surface of the end of the tube into which the sealing member is fitted is not smooth, it may cause liquid leakage or the like.

For example, Patent Document 1 discloses a pipe joint in which a groove tube having a circumferential groove formed at the tube end is used, and a ring-shaped seal member is disposed on the outer circumferential portion on the end side of the circumferential groove so as to be pressable.
Therefore, in this case as well, the surface of the outer periphery on the end side of the circumferential groove is important for ensuring sealing performance.

Therefore, conventionally, when a galvanized steel pipe is used for this type of application, the galvanized surface of the seal portion on the end side is polished after the pipe material is grooved.
In this case, the galvanized layer becomes thinner or removed, which poses a technical problem in that the antirust ability of the galvanized layer decreases.
Therefore, in order to ensure the rust-preventing power, a rust-preventive agent is applied again.

Patent Document 2 discloses a galvanized steel pipe that suppresses peeling of the galvanized layer during grooving, but the thickness of the galvanized layer is 27 to 56 μm and there is no mention of surface finish. The surface remains galvanized and is rough.

Utility model registration No. 3191551 Japanese Patent Application Publication No. 2017-57499

An object of the present invention is to provide a grooved pipe with excellent airtightness, watertightness, corrosion resistance, and high productivity, and a manufacturing machine thereof.

The grooved pipe according to the present invention is a grooved pipe using a galvanized steel pipe, and has a seal part at the tip of the pipe material and a groove part on the back side of the seal part, and the seal part is made of galvanized steel pipe. It is characterized in that the layer is formed on a smooth surface by a pressing roller.
Here, the seal portion is a tubular end provided on the end side of the tube material from the groove portion that becomes the ring recess groove formed on the outer periphery of the tube material, and the outer shape of the self-sealing member etc. is a ring. This refers to the area where a sealing member of the shape is attached to ensure airtightness and watertightness.

A galvanized steel pipe refers to a steel pipe coated with a galvanized layer, and is defined in JIS G 3442.
It has been plated and the surface is relatively rough.
Therefore, in order to improve the airtightness and watertightness between the sealing member and the sealing member, polishing treatment was conventionally performed, but the present invention uses a pressure roller to roll the surface of the sealing part of the pipe material to remove the galvanized layer. It is distinctive in that the surface is finished to a mirror-like smooth surface while leaving it intact.

A manufacturing machine suitable for manufacturing such grooved pipes includes a support roller disposed inside the pipe material, a rolling roller for rolling the pipe material from the outer peripheral side to form a groove portion, and a sealing portion. It is characterized by having a pressing roller for forming a smooth surface.

Here, the rolling roller may have a convex rolling portion and a discharge recess on a side surface of the rolling portion.

In the present invention, the seal part of the pipe material is rolled with a pressure roller at the same time or after rolling the groove part on the outer circumference of the pipe material, and the surface is finished to a smooth surface while leaving the galvanized layer. , the galvanized layer with excellent corrosion resistance remains.
Conventionally, anti-corrosion paint was applied after grinding the galvanized surface with a grinder, etc., but this not only took a long time to dry, but also made the surface soft and difficult to apply during piping construction. While there was a problem of easy scratching, the present invention does not require grinding or application of anti-corrosion paint, resulting in excellent productivity and low cost.
It also has excellent corrosion resistance.

1 shows a configuration example of a grooved pipe manufacturing machine according to the present invention. (a) to (c) show the flow of grooving a pipe material. An example of a conventional grooving machine is shown.

Grooving machines for forming grooves in tubular materials are conventionally known.
For example, FIG. 3 schematically shows the structure of a rolled portion.
The tube material 1 is inserted into the support roller (lower roller) 120 whose rotation is controlled by a drive motor (not shown), etc., and the rotatable rolling roller (upper roller) 111 is lowered from the outer circumferential side to form the groove portion 1a. is rolled.
At this time, conventionally, only the protruding rolling portion 111a of the rolling roller 111 is used to apply rolling pressure to the tube material 1.
Therefore, the seal portion 101b of the tubing 1 remains as a galvanized surface.

On the other hand, a configuration example of a grooved pipe manufacturing machine according to the present invention is shown in FIG. 1, and a processing flow is shown in FIG.
For the support roller 20 whose rotation is controlled, a rolling roller 11 for forming a groove portion in the tube material 1 and a pressing roller 12 for pressing the sealing portion of the tube material 1 and rolling it into a mirror-like smooth surface are provided. have.

This pressing roller 12 may be provided integrally with the rolling roller 11 in order to simultaneously roll the groove portion with the rolling roller 11 and roll-press the galvanized surface of the pipe material 1. After rolling the groove portion, the seal portion 1b of the tube material 1 may be provided as a separate member so as to have a smooth surface.
If the rolling roller 11 and the pressure roller 12 are provided integrally, there is an advantage that the sealing portion can be rolled and pressed at the same time as the groove portion is processed, but the rolling pressure becomes large.
On the other hand, when the rolling roller 11 and the pressing roller 12 are provided separately, it is possible to press the seal portion 1b after processing the groove portion, and the pressing force and the rolling pressure can be controlled separately.

The processing flow will be explained based on FIG. 2.
As shown in FIG. 2(a), the tube material 1 is inserted along the outer periphery of the support roller 20. As shown in FIG.
The support roller 20 is rotationally controlled by a drive motor (not shown) or the like.
The support roller 20 has a relief part 21 with a small outer diameter between the first roller part 20a and the second roller part 20b.

In this embodiment, the rolling roller 11 and the pressing roller 12 located on the end side of the tube material 1 are integrally provided.
As shown in FIGS. 2(b) and 2(c), the rolling roller 11 is lowered to form the groove portion 1a on the outer periphery of the tube material 1, and at the same time, the surface of the seal portion 1b of the tube material 1 is rolled using the pressure roller 12. Roll it into a mirror finish.

In this embodiment, a pressing auxiliary roller 12a and a separate auxiliary roller 13 are provided in order to suppress deformation of the tube material 1.
Thereby, even if the tubular material 1 is subjected to rolling pressure and rolling pressure by the pressure roller, deformation of the tubular material 1 can be suppressed.

Further, in this embodiment, by forming the discharge recess 11b on the side surface of the rolling part 11a of the protruding rolling roller 11, it becomes easy to discharge waste generated during processing.

1 Tube material 11 Rolling roller 12 Pressing roller 12a Pressing auxiliary roller 13 Auxiliary roller 20 Support roller

Claims (3)

A grooved pipe using galvanized steel pipe,
1. A grooved pipe, characterized in that the pipe material has a sealing part at the tip thereof, and a groove part on the inner side of the sealing part, and the sealing part has a galvanized layer formed on a smooth surface by a pressing roller. The grooved pipe manufacturing machine according to claim 1,
a support roller disposed inside the pipe;
a rolling roller for rolling the pipe material from the outer peripheral side to form a groove portion;
1. A grooved pipe manufacturing machine comprising a pressing roller for forming a seal portion into a smooth surface. 3. The grooved pipe manufacturing machine according to claim 2, wherein the rolling roller has a convex rolling portion and a discharge recess on a side surface of the rolling portion.

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