JP2005320781A - Manufacturing method of aluminum-made downpipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an aluminum-made downpipe capable of simply applying corrosion-proof treatment consisting of an anode oxidation coat to both surfaces of the circumferential surface and the inner circumferential surface. <P>SOLUTION: Fitting means are respectively provided to both side end edges in parallel with the longitudinal direction, a pair of longer divided downpipes 2a and 2b formed in a cylindrical-shape by unifying them with the fitting means are formed by extrusion-molding of aluminum or aluminum alloy, and after the anode oxidation treatment has been applied to both divided downpipes 2a and 2b in a divided state to form the anode oxidation coat on each circumferential surface, both divided downpipes 2a and 2b are unified by the fitting means to from it into the cylindrical-shape. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing an aluminum vertical gutter that can be easily subjected to an anticorrosion treatment made of an anodized film on both the outer peripheral surface and the inner peripheral surface.

  There is a well-known type made of aluminum that is attached to a building and used for draining rainwater (for example, see Patent Document 1). This aluminum downpipe is made of extruded material of aluminum or aluminum alloy, and has the advantage that it is excellent in strength, durability, fire resistance, etc. and can be easily recycled as compared with those made of vinyl chloride. .

Such an aluminum or aluminum alloy has an aesthetic appearance in the material itself, and the building material is preferred to have this material feeling. Therefore, an anodizing treatment that does not impair the material feeling is generally performed for the surface treatment for anticorrosion. ing.
JP 2004-76302 A

  By the way, as is well known, a vertical gutter is a long cylindrical body having a diameter of about 50 to 150 mm (nominal size) and a length of about 1000 to 4000 mm. When anodizing treatment is applied to a large and long cylindrical body, a desired anodized film can be formed on the outer peripheral surface of the cylindrical body, but an anodized film is formed on the inner peripheral surface in the vicinity of the openings at both ends. As a result, almost no anodic oxide film is formed in the interior from the opening at both ends. Therefore, the anodized aluminum downpile has a problem that it is easily corroded from the inner peripheral surface without the anodized film.

  Further, in order to uniformly form the anodic oxide film on the inner peripheral surface of the long cylindrical body as described above, it is necessary to perform electrolytic treatment with the cathode electrode also inserted into the cylindrical body. . However, in this case, it is necessary to insert a long cathode electrode from the end of the cylindrical body and hold the cathode electrode so as not to contact the inner peripheral surface of the cylindrical body. As a result, the processing cost is much higher and it is not suitable for mass production.

  The present invention solves such a conventional problem, and provides a method for producing an aluminum downpipe that can be easily subjected to anticorrosion treatment comprising an anodized film on both the outer peripheral surface and the inner peripheral surface. It is the purpose.

  The present invention is provided with fitting means on both side edges along the longitudinal direction, and a pair of long split vertical rods that are integrated by the fitting means are formed by extrusion molding of aluminum or aluminum alloy. And forming an anodized film on each outer surface by dividing the divided vertical rods into a divided state, and then integrating the divided vertical rods by the fitting means into a cylindrical shape. It is the manufacturing method of the vertical downpipe made from aluminum characterized.

  Here, the pair of divided vertical rods can be formed into various cross-sectional shapes such as a circular cross-section, a cross-sectional rectangle, a semi-circular cross-section, a substantially triangular cross-section, and a semi-circular semi-rectangular cross section by integration.

  Further, a configuration is proposed in which a secondary electrolytic coloring process is performed after the anodizing process.

  Further, as the fitting means, a fitting ridge provided with a substantially serrated retaining step edge formed on one divided vertical rod, and the fitting ridge formed on the other divided vertical rod, The structure which consists of a fitting groove of the same cross-sectional shape is proposed.

  As described above, the present invention is provided with fitting means on both side edges along the longitudinal direction, and a pair of long divided vertical rods that are formed into a cylindrical shape by being integrated by the fitting means are made of aluminum or Formed by extrusion molding of an aluminum alloy, anodized in the divided state on both split hoists to form an anodized film on each outer surface, and then both split hoists are integrated by the fitting means to form a cylinder Since it is a manufacturing method of an aluminum downspout characterized in that it is formed into a shape, anodization is performed over the entire outer surface by applying anodizing treatment in the divided state in which both split downspouts are extruded. An aluminum vertical gutter in which an anodized film is uniformly formed not only on the outer peripheral surface but also on the inner peripheral surface by forming the film uniformly and then integrating it through a fitting means into a cylindrical shape. Can getThis eliminates the troublesome work of inserting the cathode electrode from the end of the cylindrical body and maintaining the non-contact state, which has been performed when the anodizing treatment is performed in the conventional cylindrical shape. Compared to such a conventional method, since labor and time are not required, the processing cost is reduced and the mass productivity is excellent.

  Moreover, by performing a secondary electrolytic coloring treatment after the anodizing treatment, the anodized film can be colored, and the design properties of the aluminum warp can be enhanced.

  Further, the fitting means is the same as the fitting ridge provided with the substantially serrated retaining step edge formed on one divided vertical rod and the fitting ridge formed on the other divided vertical rod. In the configuration including the fitting groove having a cross-sectional shape, the fitting groove in a state where the fitting protrusion of one divided vertical rod and the fitting groove of the other divided vertical rod are opposed to each other. The split split rods can be firmly integrated into a cylindrical shape by a simple operation for forcibly inserting the fitting protrusion from the opening.

  Below, the 1st Example of the manufacturing method of the aluminum vertical hook concerning this invention is described based on an accompanying drawing.

  As shown in FIG. 1, a pair of split vertical rods 2 a and 2 b divided into two parts is used for manufacturing the aluminum vertical rod 1. The split vertical rods 2a and 2b are formed by continuous extrusion of aluminum or aluminum alloy and cut into a predetermined length of about 1000 to 4000 mm. In this first embodiment, In this case, it has a semicircular cross-sectional shape with a diameter of about 50 to 150 mm (nominal dimension). On both side edges along the longitudinal direction of the divided vertical rods 2a and 2b, as shown in an enlarged view in FIG. 2, fitting protrusions each having a substantially serrated retaining step edge 3 on one side edge. A strip 4 is formed, and a fitting groove 5 having the same cross-sectional shape into which the fitting projection 4 can be fitted is formed on the other side edge. The fitting protrusion 4 and the fitting groove 5 constitute fitting means for integrating the split vertical rods 2a and 2b into a cylindrical shape.

  Here, the two split vertical rods 2a and 2b are formed in the same cross-sectional shape, and are used with their front and rear directions reversed to each other. If it does in this way, since the metal mold | die used for extrusion molding may be one, there exists an advantage which can reduce metal mold | die preparation cost.

After forming the divided vertical rods 2a and 2b as described above, the divided vertical rods 2a and 2b are subjected to anodizing treatment in a divided state to form an anodized film on each outer surface. A known processing method is applied to this anodizing process. That is, after pre-treatment of degreasing and washing with water, sulfuric acid (free sulfuric acid concentration 150 to 180 g / l, temperature 19 to 23 ° C.) is used as an electrolytic solution, and the current density is 70 to 150 A / m ² and about 40. An anodic oxide film having a required thickness (for example, 10 to 20 μm) is formed by performing an electrolytic treatment for a minute. Next, the post-process which wash | cleans and seals is performed. Here, the sealing treatment is performed by immersing in hot water of about 90 ° C. containing nickel acetate 5 to 6 g / l and an appropriate amount of additives for 10 to 20 minutes. In this way, the anodized film can be uniformly formed over the entire outer surface by subjecting the divided vertical rods 2a and 2b to an anodizing treatment in the divided state.

  The anodized film formed by the above anodizing treatment is a silver color, but after the electrolytic treatment of the divided vertical rods 2a and 2b in the sulfuric acid bath as described above, the secondary electrolysis is performed before the sealing treatment is performed. You may make it give a coloring process. A well-known processing method is applied to the secondary electrolytic coloring treatment, and the split vertical rods 2a and 2b are subjected to electrolytic treatment in an electrolytic solution containing a metal salt so that the anodic oxide film on the outer surface of the divided vertical rods 2a and 2b. The metal is deposited and colored. Here, in the case where nickel is used as the metal to be deposited, when the amount is small, the color becomes bronze, and when the amount is large, the color becomes black. Thereby, the design property of the aluminum vertical fence 1 can be improved.

  And as mentioned above, after forming an anodic oxide film on the outer surface of the divided vertical rod 2a, 2b, the fitting formed on one side of both side edges along the longitudinal direction of the divided vertical rod 2a, 2b The fitting ridges 4, 4 are forcibly inserted from the openings of the fitting grooves 5, 5 with the ridges 4, 4 facing the fitting grooves 5, 5 formed on the other side. Thereby, as shown in FIG. 3, both split vertical rods 2 a and 2 b are integrated into a cylindrical aluminum vertical rod 1.

  Then, the split vertical rods 2a and 2b in which the anodic oxide film is uniformly formed over the entire outer surface in this way are integrated through the fitting means including the fitting protrusion 4 and the fitting groove 5. By forming a cylindrical shape, it is possible to obtain the aluminum vertical rod 1 in which the anodized film is uniformly formed not only on the outer peripheral surface but also on the inner peripheral surface. This eliminates the troublesome work of inserting the cathode electrode from the end of the cylindrical body and maintaining the non-contact state, which has been performed when the anodizing treatment is performed in the conventional cylindrical shape. Compared to such a conventional method, since labor and time are not required, the processing cost is reduced and the mass productivity is excellent.

  In addition, since the vertical gutter 1 is attached to the outer wall of the building and used outdoors, even if rain water flowing inside during rain falls slightly from the fitting portion between the fitting protrusion 4 and the fitting groove 5, There is no problem because the vertical gutter 1 itself gets wet when it rains, but if the caulking agent is injected into the fitting grooves 5 and 5 in advance when the divided vertical gutters 2a and 2b are integrated, the rainwater from the fitting portion It is possible to reliably prevent the exudation of water.

  4 and 5 show a modified embodiment of the first embodiment, which is obtained by changing the cross-sectional shape of a pair of split vertical rods 2a and 2b formed by extrusion molding of aluminum or aluminum alloy. It is. That is, the pair of split vertical rods 2a and 2b are integrated via the fitting means including the fitting protrusion 4 and the fitting groove 5 described above, thereby obtaining a rectangular cross section (see FIG. 4 (a)). , Formed into various cross-sectional shapes such as a semicircular cross section (see FIG. 4B), a substantially triangular cross section (see FIG. 5A), a semicircular semi-rectangular cross section (see FIG. 5B), etc. Has been. These split vertical rods 2a and 2b, like the first embodiment, are subjected to anodization treatment in a divided state to form an anodized film on each outer surface, and then integrated by fitting means, It is manufactured as a cylindrical aluminum vertical rod 1. As a result, the aluminum vertical rod 1 having an anodized film uniformly formed not only on the outer peripheral surface but also on the inner peripheral surface is obtained.

It is a cross-sectional view before the division | segmentation vertical fence 2a, 2b which comprises the aluminum vertical fence 1 concerning a 1st Example before integration. It is an expanded sectional view of a fitting means. It is a cross-sectional view of the aluminum vertical rod 1 in which the divided vertical rods 2a and 2b are integrated. It is a cross-sectional view which shows the cross-sectional shape of the aluminum vertical hook 1 concerning a modification. It is a cross-sectional view which shows the other cross-sectional shape of the aluminum vertical hook 1 concerning a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Aluminum vertical rod 2a, 2b Divided vertical rod 3 Retaining step edge 4 Fitting protrusion (fitting means)
5 Fitting groove (fitting means)

Claims (3)

  Fitting means are provided on both side edges along the longitudinal direction, respectively, and a pair of long divided vertical rods that are formed into a cylindrical shape by being integrated by the fitting means are formed by extrusion molding of aluminum or aluminum alloy, An aluminum characterized by anodizing the two split caverns in a divided state to form an anodized film on each outer surface, and then integrating the split caverns into a cylindrical shape by the fitting means A method for manufacturing a vertical gutter.   2. The method for producing an aluminum warp according to claim 1, wherein a secondary electrolytic coloring treatment is performed after the anodizing treatment. The fitting means has a fitting ridge provided with a substantially serrated retaining step edge formed on one divided vertical rod, and the same sectional shape as the fitting ridge formed on the other divided vertical rod. The method for producing an aluminum vertical rod according to claim 1 or 2, wherein the method comprises a fitting groove.

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