JPH05228531A - Production of vibration damping metallic pipe - Google Patents

Abstract

PURPOSE:To provide the method which can easily produce the vibration damping metallic pipe without impairing its vibration damping effect by utilizing the technique for forming a spiral pipe and the adhesive force of a resin. CONSTITUTION:The vibration damping resin 12 is supplied to one surface of a metallic strip 11 to serve as an outside pipe over the entire width thereof to form an outside plate. The outside plate is then spirally wound to a metallic pipe 13 to serve as an inside pipe with the resin layer 12 as the inner side, by which double pipes are formed. The double pipes are then heated to integrate the inside pipe and the outside pipe via the vibration damping resin 12. The continuous formation of the long vibration damping metallic pipe is possible and since there is no need for butt welding, etc., the vibration damping effect is not impaired.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a vibration-damping metal tube, and more particularly, it enables continuous molding of a long tube without welding work.

[0002]

2. Description of the Related Art Recently, there has been a growing social demand for noise prevention, and for example, for water supply / drainage pipes of hotels and condominiums, exhaust pipes of automobiles, etc., it is possible to use vibration-damping metal pipes having a high silencing effect, rather than simple metal pipes. It is supposed to be done.
A conventional vibration-damping metal tube uses, for example, a composite steel plate in which a viscoelastic vibration-damping resin such as vinyl acetate polymer, polyethylene, or polypropylene is interposed between two steel plates in a cross section. It is manufactured by forming a circular open pipe and then welding the abutting portions.
In this case, for example, a high frequency welding method is used as the welding means for the abutting portion of the open pipe. However,
In the high frequency heating, the end faces of the butts are heated uniformly in the thickness direction. Therefore, the vibration-damping resin sandwiched between them may be melted and holes may be formed to impair the vibration-damping effect. As a countermeasure, even if it is attempted to continuously weld by the micro TIG welding method using a small current with a small heat effect, the resin immediately below the welded portion also melts to generate gas, and the gas is ejected to melt the welded portion. The pond is destroyed and welding cannot be done.

On the other hand, the present applicant has previously proposed, in Japanese Patent Laid-Open No. 3-1932, a method for producing a vibration-damping metal tube that does not impair the vibration-damping effect of the vibration-damping steel plate. The proposal is to form a circular open pipe of a damping steel plate that is made by integrating damping resin between two steel plates in a sandwich shape, and then apply the opening pipe with an inner diameter larger than its outer diameter. The edge portion of the open pipe is abutted by inserting it into a heat-shrinkable resin tube and integrating the heat-shrinkable resin tube to shrink the heat-shrinkable resin tube.

[0004]

However, in the above-described conventional method for manufacturing a vibration-damping metal pipe using a heat-shrinkable resin pipe, the work of inserting the molded open pipe into the heat-shrinkable resin pipe is not performed. However, the longer the pipe, the more difficult it is, and the work load is large. Further, since the inserted open pipe is tightened by utilizing the heat shrinkage of the heat-shrinkable resin pipe and the two are integrated to form a double pipe, the outer surface of the open pipe is covered with the resin pipe. However, there is a problem that it is difficult to confirm whether or not the edge portion is completely joined.

Therefore, the present invention has been made by paying attention to the problems of the conventional method of manufacturing a vibration-damping metal tube using a welding method or a heat-shrinkable resin, and the spiral tube molding technology and the adhesive force of the resin. It is an object of the present invention to provide a method capable of easily manufacturing a vibration-damping metal pipe without damaging the vibration-damping effect by utilizing.

[0006]

A method of manufacturing a vibration-damping metal pipe according to the present invention comprises a step of supplying a vibration-damping resin to the entire width of one side of a metal band to be an outer pipe to form an outer plate, and an inner pipe. A step of forming a double tube by spirally winding the outer plate around the metal tube with the resin layer inside, and heating the double tube to form an inner tube and an outer tube through the damping resin. And a step of integrating them.

[0007]

[Function] Since the outer tube is formed by spirally winding the one side of the metal strip, which is supplied with damping resin, around the outer periphery of the inner pipe, the metal strip width, the winding outer diameter, the spiral pitch, and the forming angle. By controlling the relationship such as to a predetermined value, it is possible to automatically form a long pipe and the work load is small. Further, since the inner pipe and the outer pipe are integrally joined by the adhesive force of the damping resin interposed therebetween, butt welding or the like of the edge portion is unnecessary and the damping effect is not impaired.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. As shown in the manufacturing process block diagram of FIG. 1, a method of manufacturing a damping metal pipe according to the present invention includes a resin supplying process 1 for supplying a damping resin to one side of a metal band to be an outer pipe, and the metal band. Step 2 of forming a double tube by spirally winding a resin layer on the inner side of a metal tube as an inner tube, and heating the obtained double tube to form an inner tube and an outer tube with the damping resin. And the step 3 of integrating via.

As the metal strip, cold-rolled steel strips, chromate-treated or zinc-treated or other surface-treated steel strips, stainless steel strips, organic coated steel strips, and other various surface-treated or untreated steel sheets or steel strips are used. it can. Also, other metal plates can be used. In the above-mentioned resin supply step 1, as shown in FIG. 2, the vibration-damping resin 12 is supplied over the entire width of one side of the metal strip 11 by applying or applying a film-shaped resin. The application means are spray, coater,
Any method such as brush coating may be used and it is not particularly limited. As the damping resin, a thermoplastic resin such as polypropylene, polyethylene, thermoplastic polyester, or vinyl chloride can be used. Further, a thermosetting resin such as epoxy, polyurethane, acrylic, or thermosetting polyester can be used. Moreover, these copolymers and modified products may be used. These resins can be used alone or as a mixed resin in which a thermoplastic resin and a thermosetting resin are mixed to obtain stable hardness in a wider temperature range than in the case of each individual resin. Alternatively, two or more kinds of resins may be applied in a multilayer form for use. Alternatively,
A film-like material may be used as the vibration damping resin 12. In that case, instead of applying the resin, in the resin applying step 1, a film-shaped damping resin 12 having a width that covers the entire plate width on one side of the metal strip 11 is placed on one side of the metal strip 11 as shown in FIG. To be done.

The layer of the vibration damping resin 12 has a thickness of 100.
It is preferably μm or less. This is because if it exceeds 100 μm, the T-peel strength decreases, and peeling may occur between the resin and the metal plate depending on the conditions of molding in the secondary processing, which may reduce the vibration damping property. In the step 2 of forming the spirally wound double tube, the vibration damping resin 12 applied to the metal strip 11 is dried, and then the vibration damping resin 12 is placed inside to have a predetermined size to become an inner tube. The metal strip 11 is wound around the metal tube 13 in a spiral shape.
This winding can be performed using a well-known spiral steel pipe manufacturing facility. In that case, the relationship between the width of the metal strip 11, the outer diameter of the pipe, the spiral pitch, the forming angle, etc. is set so that the winding edges 14 do not overlap or form a gap, and a smooth circle is formed as shown in FIG. Form into a tube. In the obtained double pipe, as shown in FIG. 4, the metal pipe 13 is the inner pipe, and the outer pipe made of the metal plate 11 is provided on the outer peripheral surface thereof with the vibration damping resin 12 therebetween without any step or gap. It is formed smoothly.

In the heating step 3, the double tube formed through the above steps is passed through a heating furnace to promote the adhesion between the metal strip 11 and the metal tube 13 by the vibration damping resin 12. This heating is performed in order to sufficiently develop the adhesive force of the vibration damping resin 12, and the heating temperature is the vibration damping resin 12 used.
It is set according to the characteristics of. After this heating, the product is cooled to obtain a product of a damping metal tube. After cooling, it is also possible to apply oil coating or other rustproofing treatment if necessary.

Next, a specific embodiment will be described.
A cold-rolled steel strip having a thickness of 1.2 mm and a width (W) of 880 mm is used as the metal plate 11, and a thermosetting polyester resin, which is the vibration-damping resin 12 is applied to the entire width of one side thereof with a coater at a thickness of 40 μm. It was applied uniformly. After the applied damping resin 12 was dried, it was spirally wound around the outer peripheral surface of the inner tube 13 using the spiral steel pipe molding machine, with the surface on the resin applied side facing inward. The inner tube 13 has an inner diameter of 390 mm, an outer diameter of 400 mm,
The length was 4000 mm.

As a result, a double tube having an inner diameter of 390 mm, an outer diameter of 403 mm and a length of 4000 mm was obtained. No steps or gaps were found on the outer surface of the double pipe. This double tube is then heated to temperature 2
It was passed through a heating furnace set at 00 ° C. to promote the adhesion of the vibration damping resin 12. The product taken out from the heating furnace was cooled to room temperature to obtain a product.

Even when this damping metal pipe was bent, no trouble such as peeling was observed. As is clear from this embodiment, even a long-length vibration-damping metal pipe can be easily continuously formed and can be provided at a low cost. Further, since the inner and outer pipes are firmly joined by using the adhesive force of the vibration damping resin 12, welding is unnecessary. Further, there are various advantages such as a smooth finished surface of the obtained vibration damping metal tube.

[0015]

As described above, according to the present invention,
Damping resin is supplied to the entire width of one side of the metal band to be the outer tube to form the outer plate, and then the outer plate is spirally wound around the metal tube to be the inner tube with the resin layer inside. A heavy pipe was formed, and the double pipe was heated to integrate the inner pipe and the outer pipe through a damping resin. Therefore, long pipes can be easily formed, the work load is small, and the inner and outer pipes are integrally joined by the adhesive force of the damping resin, so butt welding of the edges is not necessary and the damping is performed. The effect that the effect is not impaired is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram of a manufacturing process of the present invention.

FIG. 2 is a partial perspective view of an outer plate before molding in the present invention.

FIG. 3 is a perspective view schematically showing a manufacturing process of the vibration damping metal pipe of the present invention.

FIG. 4 is a diagram schematically showing a cross section taken along line IV-IV of FIG. 3.

[Explanation of symbols]

 11 Metal band (outer tube) 12 Vibration-damping resin 13 Metal tube (inner tube)

Claims (1)

[Claims] 1. A step of supplying a damping resin to the entire width of one side of a metal band to be an outer tube to form an outer plate, and a spiral of the metal tube to be an inner tube with the resin plate inside the outer plate. Vibration damping, including a step of forming a double tube by winding it in a circular shape, and a step of heating the double tube to integrate the inner tube and the outer tube through the damping resin. Manufacturing method of metal tube.