JP3916183B2 - Manufacturing method of welded aluminum strip using recycled aluminum can - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a welded aluminum strip that reuses an aluminum can, and more specifically, a method for producing a welded aluminum strip that reuses an aluminum can that can produce an aluminum strip having a good surface finish by a simple method. About.
[0002]
[Prior art]
From the viewpoint that the earth's resources are limited along with the global environment, recently there has been a call for recycling of resources to reduce aluminum as much as possible and recycle aluminum cans that have been produced as conventional garbage.
[0003]
By the way, conventionally, as a reuse of an aluminum can, it is known that the aluminum can is cut into pieces and then melted and then rolled to produce a strip.
[0004]
[Problems to be solved by the invention]
However, when the aluminum can is melted, if it is directly put into the melting furnace, paint foam is generated and cannot be melted, so the paint is overheated and burned in advance. At that time, aluminum is also significantly oxidized, a large amount of metal loss of oxide occurs, the yield decreases, and the melting work becomes troublesome.
[0005]
On the other hand, another problem is the problem of material deterioration. That is, there is a problem that chromium oxide, titanium oxide, iron oxide and the like contained in the paint of the aluminum can are mixed in the aluminum and the material is remarkably deteriorated. However, removal of such a small amount of impurities is very difficult and has not been solved sufficiently.
[0006]
The present invention solves the above-mentioned problems, and in particular, a new recycling method for aluminum cans, that is, a welded aluminum strip that reuses an aluminum can that can be manufactured by welding without melting the aluminum can. The problem is to propose a manufacturing method.
[0007]
[Means for Solving the Problems]
As a means for solving the above-mentioned problems, a method for manufacturing a welded aluminum strip that reuses an aluminum can according to the present invention includes: cutting an aluminum can , and then heating the aluminum cut piece in a pure nitrogen gas atmosphere. removing deposits that have been attached to the surface, the rolling by the subsequent said aluminum cut pieces by engagement laminated together continuously heated at a low nitrogen gas atmosphere of dew point, pressing, welding, and rolling means immediately And manufacturing a welded aluminum strip.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.
[0009]
FIG. 1 shows a process diagram of a method for manufacturing a welded aluminum strip that reuses an aluminum can according to the present invention, and the method for manufacturing a welded aluminum strip will be described in detail with reference to this process chart.
[0010]
First, a large number of aluminum cans 1 to be reused are cut by a cutting machine 2 so as to be smaller than about 3 mm in width and about 2.5 mm in length to form an aluminum cut piece 1a, and then this aluminum cut piece 1a the atmosphere furnace 3 is attached to the surface by heating at a temperature of about 300 to 450 ° C. in a seal, to remove deposits 4 of paints.
[0011]
By the way, pure nitrogen gas is filled in before Kikiri囲気furnace 3.
[0013]
Next, the aluminum cut pieces 1a to deposit 4 taken from atmosphere furnace 3 has been removed is cut into about further 2 to 10 millimeters by cutting machine 5, thus finely cut the aluminum cut pieces The surface of la is then cleaned and polished by a polishing machine 6.
[0014]
The polishing machine 6 is formed by a drive unit 6a having a motor (not shown) as a drive source and an agitation tank 6b, and the agitation tank 6b contains an aluminum cut piece 1a finely cut together with the abrasive 7, by rotating stirring, before Kikiri囲気furnace 3 within at removing residues adhering to the surface of the aluminum cut pieces 1a after removal of deposits 4 of paints perform cleaning of the surface.
[0015]
Thereafter, the aluminum cut piece 1a having the surface cleaned and the abrasive 7 in a mixed state are placed on the mesh belt 9 of the conveyor 10 provided with the mesh belt 9 and conveyed to the heating press / welding apparatus. . In this conveying process, only the abrasive 7 is sifted down from the mesh belt 9.
[0016]
On the other hand, the aluminum cut pieces 1a are engaged with each other and stacked to form a band shape, and are placed on the upper surface of the band-shaped aluminum foil 11 provided in a penetrating manner in the heating and pressing / sintering device 12. By the way, both ends of the strip-shaped aluminum foil 11 protrude from both sides of the heating press / welding device 12 and are wound.
[0017]
Next, the heating press / welding device 12 includes a supply device 15 for supplying the aluminum cut piece 1a, a heating device 16 for heating the aluminum cut piece 1a, and a rolling device 17 for rolling the welded aluminum cut piece 1a. It is configured.
[0018]
The supply device 15 only needs to be able to supply the strip-shaped cut piece 1a placed on the upper portion thereof together with the strip-shaped aluminum foil 11 into the heating device 16, and is supplied while being rolled by a pair of upper and lower metal belt conveyors 20. It is formed to be able to.
[0019]
The heating device 16 is a device for welding the aluminum cut pieces 1a formed into a band shape by being engaged with each other together with the belt-shaped aluminum foil 11 supplied from the supply device 15, and is covered in an airtight state by the housing 21, A seal member (not shown) is interposed in each of the transport port and the transport port of the aluminum cut piece 1a.
[0020]
As shown in FIG. 2, a pair of heating bodies 25 in which a ceramic plate 24 having an electric heating heater 23 is laminated on the back face are disposed facing each other inside the housing 21, and the electric heating heater 23 is heat resistant. It is covered with an insulating plate 29. Reference numeral 26 denotes a ceramic soaking plate, and the ceramic soaking plate 26 transmits heat uniformly to the ceramic plate 24.
[0021]
The pressure at which the laminated aluminum cut piece 1a is sandwiched between the heating elements 25 may be a pressure such that the sectional compressibility of the laminated aluminum cut piece 1a is 70% or more in view of the welding strength.
[0022]
Further, since the laminated aluminum cut piece 1a is heated to a high temperature in the housing 21, it is very easy to oxidize, so the housing 21 is filled with 99, 9% or more of nitrogen gas. Moreover, the temperature of about 550-650 degreeC is preferable.
[0023]
By the way, when the laminated and strip-shaped aluminum cut piece 1a is heated, the aluminum cut piece 1a is bonded to the other aluminum cut pieces 1a and fired to be integrally bonded together, and further added from the front and back sides. The whole becomes smooth and porous due to the pressure. And while being carried out from the superheater 16 in this state, the aluminum strip 30 is manufactured by being rolled by the rolling device 17 which consists of a pair of work roller 27 immediately after that.
[0024]
Note that the strip-shaped aluminum foil 11 may not be provided, and the aluminum strip 30 may be manufactured by firing the aluminum cut piece 1a which is directly laminated and formed into a strip shape, followed by rolling.
[0025]
According to the method for manufacturing a welded aluminum strip that reuses an aluminum can as described above, the welded aluminum strip 30 is manufactured by cutting, crimping, welding, and rolling without melting the recycled aluminum can 1. Therefore, the manufacturing cost can be kept low.
[0026]
Further, since all the aluminum cut pieces 1a are heated in a nitrogen gas atmosphere, they are not exposed to the air at a high temperature and are usually about 15% when metal loss due to oxidation (combustion) is dissolved. In some cases, since it does not dissolve, it does not occur at all, and the surface finish can be improved.
[0027]
Further, by removing the deposits 4 of the paint or the like on the surface of the aluminum cut pieces 1a in atmosphere furnace 3, it is possible to allow the production of welded aluminum strip 30 of high purity.
[0028]
【The invention's effect】
As described above, according to the method for manufacturing a welded aluminum strip that reuses the aluminum can according to the present invention, the welded aluminum strip is processed through the steps of cutting, crimping, welding, and rolling without melting the aluminum can. Therefore, the manufacturing cost can be kept low.
[0029]
Also, cut pieces after cutting the aluminum cans, since the removal of deposits of coating material or the like which is attached to the surface by heating in a pure nitrogen gas atmosphere, the production of welded aluminum strip of preventing high-purity oxide Can be made possible.
[0030]
Furthermore, the cut pieces are engaged with each other and continuously heated, pressed, welded in a nitrogen gas atmosphere having a low dew point, and immediately after that, rolled by rolling means to produce a welded aluminum strip. The surface is not exposed to the atmosphere, and oxidation is prevented and the surface finish can be improved.
[0031]
The aluminum plate manufactured by the above method is porous because of welding. Therefore, using this characteristic, new applications can be sufficiently expected as a new material that is lighter than, for example, a sound insulation board for buildings, roads, etc., heat insulating materials for construction, and aluminum.
[Brief description of the drawings]
FIG. 1 is a process diagram showing a method for producing a welded aluminum strip that reuses an aluminum can according to the present invention. FIG. 2 is a detailed explanatory diagram of a heating press / welding apparatus in the process diagram.
1 Aluminum can 1a Aluminum cut piece 4 Deposit

Claims (1)

After cutting the aluminum cans, the aluminum cut pieces were heated in a pure nitrogen gas atmosphere to remove the deposits that have been deposited on the surface, then the aluminum cut pieces were engagement laminated together dewpoint low nitrogen gas A method for producing a welded aluminum strip that reuses an aluminum can, characterized in that a welded aluminum strip is produced by continuously heating, pressing, and welding in an atmosphere, and immediately thereafter rolling by a rolling means.

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