JPS64158B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stainless steel clad aluminum trolley wire.

There is a stainless steel clad aluminum trolley wire made of a composite conductor using a thick aluminum strip with relatively low deformation resistance as the base material and a thin stainless steel strip with relatively high deformation resistance as the sliding member. As a method of manufacturing this stainless steel clad aluminum trolley wire, there is a method of integrating a stainless steel strip and an aluminum strip by hot extrusion, as disclosed in, for example, Japanese Patent Application Laid-Open No. 55-5175. In this method, seizure due to contact between the stainless steel strip and the extrusion die is a problem, and in order to avoid this, two sets of stainless steel strips are placed back to back and aluminum is extruded on both sides. An effective method is to simultaneously manufacture stainless steel clad aluminum trolley wire. By the way, although this method avoids contact between the stainless steel strip and the extrusion die, there are pre-treatment lines for the stainless steel strip and aluminum strip and post-treatment ( 2 sets of lines (including winding) are required for each line. In addition, to ensure the adhesion of two sets of stainless steel strips and two sets of aluminum strips, a large extruder is required, and as a result, the problem that the equipment becomes very complicated and large can be avoided. It's a place where you can't do it. In addition, in a general ram type extruder, it is necessary to stop the extruder every time a billet is loaded into a container. Therefore, the stainless clad aluminum trolley wire extruded by the extruder has local parts in its longitudinal direction. There is a problem that dimensional change portions (stop marks) occur on the surface.

On the other hand, instead of the manufacturing method using an extruder, a method is being considered in which a stainless steel strip and an aluminum strip, each heated to 200 to 650° C., are pressed together by rolling using a roll rolling device. In this method, in order to sufficiently press the stainless steel strip to the aluminum strip in a metallurgical sense, it is necessary to apply a pressure of at least 40% or more to the aluminum strip, which has low deformation resistance. Applying such a large amount of pressure not only requires extremely large rolling equipment, but also puts the stainless steel strip at risk of being rolled and deformed (thickened). Become. In general, in the method of manufacturing cladding materials by pressing aluminum strips and stainless steel strips together by roll rolling, the aluminum strips may be deformed, but the stainless steel strips are sometimes hard and are expected to deform from the beginning. do not have. This results in stainless steel strips and deformation (thickness reduction).
If this happens, there will be errors in the dimensional accuracy of the stainless steel strip, and in the case of trolley wires, the stainless steel strip functions as a wear-resistant sliding member, so if the thickness is reduced, there will be a guarantee. This will cause a major problem in that the service life will be shortened. In addition, when the stainless steel strip is worked so strongly that it is deformed, the stainless steel strip moves due to the lateral escape of the thick aluminum strip during rolling, making it difficult to position the stainless steel strip. Not only is this difficult, but the metal structure of the stainless steel strip changes from austenitic (non-magnetic) to martensitic (magnetic) due to work hardening, resulting in poor corrosion resistance and quality problems. There is a risk.

In view of the above, an object of the present invention is to fabricate a composite conductor using a thick aluminum strip with relatively low deformation resistance as the base material and a thin stainless steel strip with relatively high deformation resistance as the sliding member. A method that can manufacture stainless steel clad aluminum trolley wire by pressure welding by roll rolling with a small processing degree, and that can easily manufacture a sound stainless steel clad aluminum trolley wire with stable quality. It is about providing.

That is, the gist of the present invention is to use an aluminum strip with relatively low deformation resistance as the base material, and use a thin stainless steel strip with relatively high deformation resistance as the sliding member. In the method for manufacturing a stainless steel clad aluminum trolley wire in which the stainless steel strips are pressure-welded by roll rolling and integrated, one side of the stainless steel strip on the side to be pressure-welded with the aluminum strip is preliminarily coated with aluminum that is easily bonded to aluminum. A method for manufacturing a stainless steel clad aluminum trolley wire, characterized in that the wire is coated with a metal such as aluminum alloy or tin.

In the above, the surfaces of the stainless steel strip and the aluminum strip that are to be joined to each other are cleaned by a cleaning device as a pretreatment during roll rolling, and then heated by a heating device.

Next, an embodiment of the method for manufacturing the stainless steel clad aluminum trolley wire of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, 1 is a stainless steel strip supply device, and 2 is an aluminum strip supply device. The stainless steel strip supply device 1 supplies a stainless steel strip 14 with a thickness of 3 mm, and the aluminum strip supply device 2 supplies a stainless steel strip 14 with a thickness of 3 mm. is approximately 4 to 4 of the stainless steel strip 14.
A five times thicker aluminum strip 4 is supplied.
Here, the stainless steel strip 14 is a composite strip 3 having an aluminum strip 15 clad in advance on one side thereof to be joined to the aluminum strip 4, as shown in FIG. 2 or 3. Reference numeral 5 denotes a cleaning device for brushing, whereby the surfaces of the composite strip 3 and the aluminum strip 4 that are joined to each other are cleaned. 6 is a heating device in which the composite strip 3 and the aluminum strip 4 cleaned as described above are heated to 200 to 550°C, respectively. The composite strip 3 and the aluminum strip 4 thus heated are then led to a rolling mill 7, shown largely in FIG. 1 or FIG. 2, where they are pressed into one piece by rolling. 9 is a stainless steel clad aluminum trolley wire (see Fig. 5) manufactured by integrally press-welding it as described above;
8 is its cooling device, and 10 is a winder.

In rolling the composite strip 3 and the aluminum strip 4, the thickness of the composite strip 3 made of the stainless steel strip 14 hardly changes even after passing through the roll rolling device 7. On the other hand, the aluminum strip 4, which has a cross-sectional area of 150 mm ² in FIG. 4, becomes 120 mm ² as shown in FIG. 5 by passing through the roll rolling device 7. As a result, the cross-sectional shrinkage rate of the aluminum strip 4 is 20%, which is equivalent to adding a working degree of 20% to the aluminum strip 4. Generally, in order to press and integrate the stainless steel strip 14 and the aluminum strip 4 by roll rolling, a good joint cannot be obtained unless the aluminum strip 4 is processed at least 40% or more. In this embodiment, by cladding one side of the stainless steel strip 14 with an aluminum strip 15 that is easily bonded to aluminum in advance, a good joint can be obtained with approximately 1/2 the degree of processing. Regarding the present invention, the stainless steel strip 14
If the thickness of the aluminum strip 4 is the same as that of the stainless steel strip 14, or if the thickness of the aluminum strip 4 is thinner than that of the stainless steel strip 14, the invention does not apply. If the material is thick, reducing the degree of processing required for pressure welding will be a major improvement.

In addition to the above-mentioned cladding method, thermal spraying, hot-dip plating, and the like may be used as a method for providing a coating of a metal that is easily bonded to aluminum, such as the aluminum strip 15, on one side of the stainless steel strip 14 in advance.
Further, as the coating metal, in addition to aluminum, aluminum alloy, tin, tin alloy, zinc, zinc alloy, etc. can be used. These metal coatings may be formed not only on one side of the stainless steel strip but also on the entire surface. In this case, when tin or zinc is formed as the coating metal on the surface of the stainless steel strip opposite to the joint surface, that is, on the sliding surface, the current collection characteristics of the trolley wire are improved from the sliding surface point of view.

As described above, according to the method of manufacturing the stainless steel clad aluminum trolley wire of the present invention, thick aluminum with relatively low deformation resistance is used as the base material, while thin aluminum with relatively high deformation resistance is used as the sliding member. When manufacturing a stainless steel clad aluminum trolley wire made of a composite conductor using stainless steel strips by pressure welding by roll rolling, one side of the stainless steel strip is coated with a metal that is easy to bond to aluminum in advance, making it possible to bond both metal strips together. It has the effect that pressure welding can be easily performed with a small degree of processing, and that a stainless steel clad aluminum wire with a stable quality and sound structure can be obtained thereby. In addition, it can be said that the present invention has great effects in reducing the size of the roll rolling machine and simplifying the equipment.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the method for manufacturing a stainless steel clad aluminum trolley wire of the present invention, FIG. 2 is an enlarged cross-sectional view of section A in FIG. 1, and FIG. 4 is a sectional view taken along the - arrow in FIG. 2, and FIG. 5 is a sectional view taken along the - arrow in FIG. 1: Stainless steel strip supply device, 2: Aluminum strip supply device, 3: Composite strip, 4: Aluminum strip, 5: Cleaning device, 6: Heating device, 7: Roll rolling device, 14: Stainless steel strip, 15: Aluminum strip.

Claims (1)

[Claims] 1 A thick aluminum strip with relatively low deformation resistance is used as the base material, while a thin stainless steel strip with relatively high deformation resistance is used as the sliding member, and the aluminum strip and the stainless steel strip are rolled. In the method of manufacturing a stainless steel clad aluminum trolley wire, the stainless steel strip is made of aluminum, aluminum alloy, tin, etc., which is easily bonded to aluminum, on one side of the stainless steel strip that is pressure welded to the aluminum strip. A method for manufacturing a stainless steel clad aluminum trolley wire, characterized by using a metal-coated wire.