JPH0342155B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a contact wire, particularly a steel-cored contact wire.

A wear-resistant iron alloy wire having a thickness smaller than the width of the contact wire body obtained by molding a highly conductive metal base material into a predetermined cross-sectional shape and having an appropriate cross-section such as a circular cross-section or a square cross-section. A contact wire having a structure in which a part of the contact wire is embedded in a predetermined position of an arcuate surface formed on the sliding side of a contact wire main body is exposed is conventionally known as a steel-cored contact wire.

FIG. 1 shows a cross-sectional example of such a steel-cored contact wire. In the figure, 1 is a steel wire serving as a steel core, and a portion of it is exposed at a predetermined position on the arcuate surface of the contact wire body 2, which is obtained by finishing a highly conductive metal base material such as aluminum into a predetermined shape. It has a structure that is embedded in such a way that it In the example a, the steel wire has a circular cross section, and in the example b, the steel wire has a substantially inverted trapezoidal cross section.

The reason why the contact wire main body 2 is formed into an arcuate surface is as follows. That is, in general, a current collector slider presses into contact with the contact wire in a horizontal direction perpendicular to the length direction of the contact wire, and slides the contact wire as the moving device travels. may come into contact with the contact wire at an angle away from the horizontal plane depending on the running condition of the moving device that supports it. In consideration of such an inclined state of the slider plate, the side surface on the sliding side is made into an arc shape, and the steel wire is partially exposed at the center thereof.

Conventionally, the above-mentioned steel-cored contact wires have been manufactured by wire drawing or extrusion. In the wire drawing method, a highly conductive metal base material is formed into the shape of a contact wire body 2 with a non-circular cross section and an arcuate surface and grooves using a large number of dies, and the steel wire is embedded in the grooves and drawn. There was a problem in that the number of manufacturing steps required for processing was quite large, making it impossible to finish economically. On the other hand, in the extrusion method, the steel wire is passed through a die that serves as the extrusion molding part of the metal base material, and while the metal base material is extruded and formed into a predetermined shape, the steel wire is passed through the die that serves as the extrusion molding part of the metal base material. It is embedded and integrated into the
When manufacturing steel-cored contact wires in which a portion of the steel wire is exposed as described above, in normal extrusion equipment, the steel wire, which is harder than the metal base material, is passed through the die in contact with the die forming opening. As a result, the extrusion pressure of the metal base material caused significant friction between the steel wire and the die, and there was a fear that satisfactory extrusion could not be performed. For this reason, expensive equipment with a special structure, such as one that reduces the frictional resistance of the steel wire against the die, is required.

Therefore, the present inventors focused on a method using a rolling process using a pair of rolls, as a relatively easy manufacturing method that does not require a large number of steps as described above and special and expensive equipment. .

However, when such a steel-cored contact wire was manufactured using a pair of rolls, it was found that there was a problem in that it could not be manufactured as a satisfactory steel-cored contact wire.

That is, one roll of the pair of rolls had an arcuate groove in order to form the arcuate surface of the contact wire main body 2, and the steel wire serving as the steel core was passed through this groove. When we rolled the metal base material that will become the contact wire body, we found that the position where the steel wire passed through the arc-shaped groove was not constant, and the steel wire was exposed at a fixed position on the arc surface of the contact wire body. It was not possible to manufacture a contact wire with a steel core that was pressed in with higher precision.

This means that as long as the steel wire 1 is exposed within the arcuate surface of the contact wire main body 2 as shown in Fig. 1, the passing position of the steel wire with respect to the roll side groove should be kept constant. It was found that the problem was difficult to solve and could not be solved.

In addition, to the extent that the steel wire is exposed to the arcuate surface of the contact wire main body, when the slider plate slides perpendicularly in a horizontal plane, the steel wire can always be slid with priority, but if When the slider slides in an inclined position with respect to the horizontal plane, it will slide not only on the exposed part of the steel wire but also on the arcuate surface of the contact wire body, which is the purpose of improving the wear resistance of the steel wire. There was a problem that could not be fully fulfilled.

In view of the above-mentioned problems, the present invention provides a highly accurate steel-cored contact wire in which a wear-resistant iron alloy wire such as a steel wire is precisely embedded and integrated into a contact wire main body at a predetermined position using a pair of rolls. It is an object of the present invention to provide a method for producing a steel-cored contact wire that can be obtained and also have excellent wear resistance.

That is, as shown in FIG. 2, the method for manufacturing a steel-cored contact wire according to the present invention involves forming a highly conductive metal base material for forming the contact wire main body 2 into a suitable shape such as a circular cross section or a rectangular cross section. A method in which a wear-resistant iron alloy wire 1 having a cross section is attached and rolled between a pair of rolls 4 and 5, and between a pair of forming guides 6a and 6b facing each other from the axial direction of the rolls, The roll 4 on the metal base material side is a flat roll with a smooth surface, and the roll 5 on the wear-resistant iron alloy wire side has an arcuate groove 51 and a small groove 52 formed one step deeper within the groove. The contact wire main body 2 having the circular arc surface 21 is formed by rolling the metal base material using a grooved roll having a grooved roll with a part of the wear-resistant iron alloy wire 1 fitted into the small groove 52 of the grooved roll. At the same time, the contact wire is manufactured as a steel cored contact wire in which a portion 3 of the wear-resistant iron alloy wire 1 protrudes from the arcuate surface 21 of the contact wire main body 2.

FIG. 2 shows an example in which the contact wire main body 2 is manufactured as a grooved overhead contact wire.

In this embodiment, a stainless steel wire made of SUS 304 and having a diameter of 3.2 mm is used as the wear-resistant iron alloy wire 1, and an aluminum alloy made of A1100 is used as the metal base material forming the contact wire body 2. in width
A square rod-shaped body of 10 mm and height of 20 mm was used.

The stainless steel wire prepared as described above is wire brushed over its entire circumference, and the square rod-shaped body is wire brushed on the side where the stainless steel wire is to be embedded.
℃, and the stainless steel wire 1 was attached to the rectangular rod-shaped body and fed between a pair of rolls 4 and 5.

The lower roll 5 has an arc-shaped groove 51 that matches the arc surface 21 of the contact wire main body 2, and a small groove 52 that matches the portion 3 of the stainless steel wire. Therefore, stainless steel wire is
A part of the rod-shaped body is fitted into the small groove 52 of the roll 5, and in this state, the square rod-shaped body is caused to undergo compositional deformation by the rolling force of the upper and lower rolls 4 and 5, and is filled into the arc-shaped groove 51 by metal flow. It is rolled to form a contact wire main body 2 having an arcuate surface 21, and is manufactured as an aluminum/stainless steel composite steel-core contact wire with a portion 3 of the stainless steel wire 1 protruding from the arcuate surface 21.

Between the upper and lower rolls 4 and 5, there is a contact wire main body 2.
A molded guide 6 having a shape that fits both sides of the
a and 6b are interposed, thereby obtaining the side surface shape of a grooved overhead contact wire.

One roll 4 is a flat roll with a diameter of 300 mm. The other roll 5 is a grooved roll with a diameter of 300 mm. In the roll 5, the arc-shaped groove 51 is
The width is 11 mm and the depth is 4 mm, and the small groove 52 is the same as the groove 51.
It is set as 1mm from the bottom of. Therefore, the stainless steel wire has a small groove 5 corresponding to 1 mm out of its diameter of 3.2 mm.
2.

According to the method for manufacturing a steel-cored contact wire according to the present invention as described above, the alloy wire that provides wear resistance against sliding is partially fitted into the small groove of the roll, and the circular shape of the roll is The contact wire can be passed through the contact wire at a constant position at all times, and this allows the wear-resistant iron alloy wire, such as steel wire, to be accurately embedded and integrated into the contact wire body at a predetermined position using a pair of rolls. The purpose of obtaining a high-precision steel-cored contact wire has been achieved, and according to the steel-cored contact wire manufactured as described above, a portion of the wear-resistant iron alloy wire is separated from the arcuate surface of the contact wire body. Since it can be provided as a protruding piece, it always has wear resistance even when the current collector slider plate, which presses into contact orthogonally to the contact wire body, slides in a horizontal plane, as well as when it slides at an angle away from the horizontal plane. By sliding the protruding part of the iron alloy wire, it is possible to avoid sliding against the arcuate surface of the contact wire body, which is somewhat inferior in terms of wear resistance, and it is said to have excellent wear resistance. The purpose will also be achieved. It has excellent effects such as

[Brief explanation of drawings]

1A and 1B are cross-sectional explanatory views showing a structural example of a conventional steel-cored contact wire, and FIG. 2 is a cross-sectional explanatory view showing a preferred embodiment of the method for manufacturing a steel-cored contact wire according to the present invention. be. In the symbols, 1 is a wear-resistant iron alloy wire (stainless steel wire), 2 is a contact wire main body (aluminum profile), 3 is a part (protruding part) of a wear-resistant iron alloy wire, 4 and 5 are rolls, 6a,
6b is a forming guide, 21 is an arcuate surface of the contact wire main body, 51 is an arcuate groove, and 52 is a small groove.

Claims (1)

[Claims] 1. A highly conductive metal base material for forming the contact wire main body is attached to a wear-resistant iron alloy wire having a suitable cross section such as a circular cross section or a square cross section, and is placed between a pair of rolls, and the axis of the roll is In this method, rolling is performed between a pair of forming guides facing each other in the direction, and the roll on the metal base material side is a flat roll with a smooth surface, and the roll on the wear-resistant iron alloy wire side is an arc-shaped roll. Using a grooved roll having a groove and a small groove formed one step deeper within the groove,
A part of the wear-resistant iron alloy wire is inserted into the small groove of the grooved roll, and the metal base material is rolled to form a contact wire body having an arcuate surface, and a contact wire body is formed from the arcuate surface of the contact wire body. A method for manufacturing a steel-cored contact wire, characterized in that the steel-core contact wire is manufactured as a steel-cored contact wire in which a portion of the abradable iron alloy wire protrudes.