JPS61207235A - Manufacture of rigid electric-car track - Google Patents

Abstract

PURPOSE:To limit coherent extrusion to a head part alone as well as to make a rigid electric-car track manufacturable without using a large-sized extruding machine, by manufacturing the head part and a body part separately and then joining both parts together by means of welding. CONSTITUTION:Metals 3 and 3 of aluminum or the like excellent in conductivity and corrosion resistance are extruded at both sides in the shape of containing two sheets of metals 2 and 2 excellent in abrasion resistance and, after forming two head parts 4 and 4, these are divided. And, separately such a metal as being excellent in conductivity and corrosion resistance is extruded, forming a body part 5, and beveling tapers 6 and 6 for welding and connection are formed on the top of this body part 5. Next, the top of the body part 5 is applied to a bottom surface of the head part 4, and both are welded and joined together in a longitudinal direction, unitizing them in one, thus a rigid electric- car track is secured. Therefore since a large-sized extruding machine is no longer required, the rigid electric-car track is manufacturable at low-unit cost of production.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method of manufacturing a rigid overhead contact line mainly used for subways, mole rails, new transportation systems, etc.

[Prior art and its problems]

Recently, as a rigid overhead contact line, the rigid body/feeder is made of a metal with good conductivity, high corrosion resistance, and relatively light weight (for example, aluminum or its alloy), and the surface that comes in contact with the pantograph of the electric train etc. Closely bonded metal (eg, stainless steel) plates with good wear and corrosion resistance have been developed. Figure 4 shows an example, where l is a rigid body and feeder made of metal with good conductivity;
2 is a metal plate with good wear resistance that is closely connected to the head.

In such a rigid overhead contact line, if there is a gap at the joint A between the rigid body/feeder 1 and the metal plate 2, electrochemical corrosion will occur due to the potential difference between each metal. It is necessary to have complete metallic contact.

For this reason, an effective method for manufacturing the above-mentioned rigid overhead contact line is the extrusion method, in which the two types of metals are extruded simultaneously under high temperature and high pressure, and the joints between the two are completely bonded metallically. Since the two metals have considerable differences in strength, softening temperature, etc., and their fluidity within the extruder is also different, it is necessary to extrude them into a form with the metal plate 2 on only one side of the lock/feeder l, as shown in Figure 4. However, as shown in Fig. 5, after extruding the two rigid lid fidgets 1 in a symmetrical arrangement with the two metal plates 2 and 2 inside, the two rigid overhead contact wires are connected to each other. The method is to divide. Note that it is also possible to manufacture three or four rigid overhead contact lines at the same time using such a method.

However, in the above method, multiple rigid contact wires must be extruded at the same time, so the diameter of the die of the extruder is more than twice that of extruding a single piece, requiring an extremely large extruder. Because of this, equipment costs increase,
It has the disadvantage of high cost.

[Means for solving problems and their effects]

In order to solve the problems of the prior art as described above, the present invention consists of a rigid body/feeder made of metal with good conductivity and corrosion resistance, and a metal plate with good wear resistance in the longitudinal direction of the head. In the method for manufacturing a closely bonded rigid overhead contact wire, the metal with good S conductivity and corrosion resistance is closely extruded together with the metal plate to form a head, and separately from this, the metal with good conductivity and corrosion resistance is extruded together with the metal plate. A main body portion is formed of metal and has a groove taper for welding connection at a portion that contacts the head, and then the head and main body are welded and connected in the longitudinal direction to be integrated. It is something to do.

In this way, only the head part is required for close contact extrusion, so the diameter of the die can be small, and production can be performed using a small extruder.

〔Example〕

1 to 3 show one embodiment of the present invention.

First, as shown in Fig. 2, two metal plates 2 with excellent wear resistance are enclosed, and metal plates 3 with good conductivity and corrosion resistance, such as aluminum or its alloy, are placed on both sides.
is extruded to form two heads 4.4, which are then divided. Separately, as shown in FIG. 3, the same metal with good conductivity and corrosion resistance is extruded to form a main body portion 5 having an inverted T shape. The top of the main body 5 is formed with groove tapers 6, 6 for welding connection.As shown in FIG.
The rigid contact wire 7 is obtained by welding the two together in the longitudinal direction and integrating them. 8.8 is the welded part. The single length of the rigid overhead contact line 7 is usually about 10 m.

〔Effect of the invention〕

As explained above, according to the present invention, the head and body parts of the rigid overhead contact line are manufactured separately and then welded and connected to obtain the rigid overhead contact line, which has good conductivity and corrosion resistance. Close extrusion of metal and a metal plate with good wear resistance is done only at the head, so the die for extrusion only needs to have a small diameter, and a large extruder is not required, making it possible to produce rigid contact wires at low cost. It has the advantage of being manufacturable.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a rigid overhead contact line manufactured by the method of the present invention, and Figure 2 is a cross-sectional view of a rigid overhead contact line manufactured by the method of the present invention. ! A cross-sectional view showing the main body of the contact line, Figure 4 is a cross-sectional view showing a conventional rigid contact line, and Figure 5 is a conventional rigid contact line. FIG. 3 is a cross-sectional view showing the manufacturing process. 2 - metal plate with good wear resistance, 3 - metal with good conductivity and corrosion resistance, 4 - head, 5 - main body, 6 - groove taper, 7 - rigid overhead wire, 8 - welded part. Figure 1 Figure 4 Figure 3 Figure 5

Claims (1)

[Claims] In a method for manufacturing a rigid overhead contact line in which a rigid body/feeder is made of a metal with good conductivity and corrosion resistance, and a metal plate with good wear resistance is tightly bonded to the longitudinal direction of the head, the above-mentioned conductivity and corrosion resistance The head is formed by closely extruding a metal of good quality together with the metal plate, and separately, a groove taper is formed at the part in contact with the head of the metal with good conductivity and corrosion resistance for welding connection. 1. A method for manufacturing a rigid overhead contact line, comprising: forming a main body having a head portion, and then welding and connecting the head and the main body in the longitudinal direction to integrate the head and the main body.