JPH034317B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a method for manufacturing a composite contact wire, etc. whose sliding surface is coated with a wear-resistant hard material. [Prior art] Conventionally, in order to improve the wear resistance of contact wires,
Composite contact wire is used, which is made of aluminum or aluminum alloy coated with stainless steel (SUS). This kind of contact wire has a sliding surface.
Either the SUS can be completely integrated with the top of the aluminum profile that is the contact wire main body by pressing up or rolling pressure welding, or the end of the SUS molding that serves as the sliding surface can be attached to the top of the contact wire main body. It is made by fitting and inserting into a groove made on the top of the aluminum, compressing and deforming the aluminum from the side, and mechanically caulking it into one piece. Figures 2 and 3 are cross-sectional views of composite contact wires made by such a conventional method, and in both cases, the top of the aluminum alloy 1 of the contact wire body is made of stainless steel (SUS) 2. covered. [Problems to be Solved by the Invention] However, as shown in the figure, the composite contact wire obtained in this way has aluminum exposed on the side of the SUS coating, so it is susceptible to wear and tear during use as a contact wire. As the wear of the plate progresses, the side wall of the wear groove of the contact wire comes into direct contact with the aluminum on the top side of the contact wire, and the contact between the contact plate and the aluminum, which has poor sliding characteristics, impairs the current collection function. Otherwise, the contact plate and contact wire material may be damaged, which may impede the current collection function. In the former metal bonding method, the characteristics of the joint are perfect, but sophisticated equipment and techniques are required to obtain the joint. The latter caulking method is easier to manufacture, but since it involves mechanically contacting aluminum and SUS, which tend to form an insulating oxide film on the surface, consideration must be given to maintaining the electrical contact function of the interface. Therefore, it is necessary to carefully remove the oxide film on the aluminum surface during manufacturing. Furthermore, since there is a limit to the deformation of aluminum during caulking, voids may occur at a portion of the Al/SUS contact interface, and there are associated problems such as water intrusion from the end face. [Means for Solving the Problems] The purpose of the present invention is to solve the above-mentioned drawbacks of the prior art, and to provide a composite metal material that can produce composite metal materials such as aluminum/stainless steel composite contact wires with good properties. The purpose of the present invention is to provide a method for manufacturing composite materials such as rod-shaped or wire-shaped contact wires by coating a part of the surface of the core metal with a hard metal. In the method of manufacturing metal materials, the cross-sectional shape of the surface-coated metal material has an angle with the bottom surface.
Shape it in advance so that it has a concave shape of 90° to 120°,
This is placed with the bottom side down in a mold tool having a groove that is approximately the same shape as the concave shape, and the side surfaces of the core material and both sides of the concave covering material contact each other, causing the surface layer of the core material to flow and deform. A method for manufacturing a composite metal material, characterized in that a core material is press-fitted into a concave metal sheathing from the opening side thereof so that the newly formed surface is in close contact with the sheathing material. The present invention is particularly suitable for manufacturing composite contact wires in which aluminum or aluminum alloy is used as the core material and stainless steel such as SUS is used as the coating material.
It can also be applied to the production of contact wires made of combinations of other metals and linear or rod-shaped composite metal bodies having similar configurations other than contact wires. [Function] The function of the present invention will be explained in the case of manufacturing an Al/SUS composite contact wire. That is, in the present invention, a SUS covering material (molded body) having a concave cross-sectional shape and side surfaces inclined at up to 90° or 120° is placed in the groove of the mold tool, in accordance with the shape of the top of the trolley, The aluminum core material is press-fitted into the concave covering material so that its side surface layer is in contact with the inner surface of the concave covering material, and at this time, the aluminum surface is sheared and deformed by the side surface friction force at the time of press-fitting, thereby forming an oxide film on the aluminum surface. Destroy the layer and bring the new aluminum surface with no oxide film into close contact with the SUS side wall.
At the same time, by press-fitting the aluminum core material into the concave SUS molded body with sufficient pressure so that no voids are generated at the Al/SUS interface, no aluminum is exposed at the top of the trolley. A composite contact wire with excellent characteristics can be obtained. In addition, if the angle between the side surface of the concave SUS molded body and the bottom surface is less than 90 degrees, the side surface of the aluminum core material to be press-fitted and the SUS side will not come into contact to cause shear friction.
If the angle is 120° or more, even if the aluminum side contacts the SUS side surface and is press-fitted, due to the relationship between the surface pressure and shear force at the contact area, sufficient shearing deformation of the core side surface is unlikely to occur, making it difficult for the oxide film layer to break. The above is about the case of SUS and aluminum, but SUS is used as the surface coating material in the present invention.
However, the core material is not limited to aluminum or aluminum alloy, and other relatively soft metal materials with good conductivity can also be used as the core material. [Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 4. Figure 1a shows that aluminum is made according to the invention.
FIG. 2 is an explanatory diagram (schematic cross-sectional view) showing the process of manufacturing a SUS composite contact wire, and FIG. 2B is a cross-sectional view of the composite contact wire obtained by the method. A SUS covering material 2 formed into a concave cross-section having a shape similar to that of the aluminum core material 1 is set in the groove of a mold tool 3 having a groove having the same shape as the concave covering material 2. The side walls of the concave covering 2 form an angle of 90° to 120° with the bottom surface, as described above.
Next, the aluminum core material 1 is press-fitted into the concave SUS covering material using a press-fitting tool 5. Reference numeral 4 denotes a holding tool that holds down the SUS covering material 2 set in the mold tool and prevents the aluminum core material 1 from spreading in the direction of the groove when press-fitting the aluminum core material 1 into the concave covering material 2. The width of the opening of the mold tool used in this example is 28
mm, the bottom width was 25 mm, and the depth was 20 mm. The covering material is SUS304 stainless steel formed into a concave shape with a thickness of 3 mm, and the core material is 21.5 mm in width and 20 mm in height.
A composite contact wire 6 as shown in FIG. 1b was manufactured by press-fitting a 6063Al alloy with a diameter of 6063 mm at room temperature at a maximum press-fitting pressure of 9 tons without removing the surface oxide film. In addition, a 6063Al alloy of the same shape with the surface oxide film removed by brushing was made into SUS304 under the same conditions as above.
A composite contact wire was manufactured by press-fitting into a similar concave covering material. Regarding both composite contact wires above, the SUS surface and
The electrical resistance between the Al alloys was measured using a milliohmmeter, and the interfacial resistance of each composite trolley was compared, but almost no difference was observed, and no voids were generated at the interface in both cases. . That is, according to the present invention, SUS coating with extremely good adhesion could be achieved without removing the oxide film on the aluminum alloy surface in advance. In the above example, the Al alloy core material was press-fitted while changing the angle between the side surface and the bottom surface of the SUS molded body, and the electrical resistance after press-fitting was measured. Table 1 shows the results.

〔Effect of the invention〕

According to the present invention, the side surface of the contact wire is also coated with the coating material, and it is possible to prevent aluminum, etc. from being exposed on the side surface of the sliding surface, and the core material and the coating material are closely bonded without any troublesome pretreatment. can be done. Further, according to the present invention, it is possible to manufacture a composite trolley wire having a watertight structure in which the core material and the covering material have good electrical contact and there are no voids at the interface between the two. Furthermore, according to the present invention, the equipment is simple;
For example, a long composite contact wire can be manufactured and installed at the installation site. Furthermore, if the sliding material such as SUS wears out during use of the contact wire, the SUS coating can be removed and a new SUS coating can be easily applied. Further, according to the present invention, thermal expansion of aluminum in the width direction can be absorbed by the spring effect of the side surface of the SUS molded body during manufacture of the composite contact wire.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram (schematic sectional view) showing an example of the process of manufacturing a composite contact wire according to the present invention;
3 and 3 are cross-sectional views showing a conventional composite contact wire, and FIG. 4 is an explanatory view showing another aspect of the present invention. 1... Aluminum alloy core material, 2... Stainless steel coating material, 3... Mold tool, 4... Holding tool, 5
...Press-fitting tool, 6...Compound contact wire.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a rod-shaped or wire-shaped composite metal material in which a part of the surface of the core metal is coated with a metal harder than the core metal, in which the surface-coated metal material has a cross-sectional shape that is the same as the bottom surface. It is preformed so that it has a concave shape with an angle of 90° to 120° with the side surface, and is placed with the bottom side down in a mold tool that has a groove that is almost the same shape as the concave shape. The core material is press-fitted into the concave metal sheathing material from the opening side so that the side surface of the core material and the inner surface of the concave metal sheathing material contact each other, causing the surface layer of the core material to flow and deform, and the newly formed surface coming into close contact with the sheathing material. A method for manufacturing a composite metal material, characterized by: 2 The core material is aluminum or aluminum alloy,
Claim 1 in which the covering material is stainless steel
A method for producing a composite metal material as described in .