JPS6347556B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing 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 lines each (including winding)
A set is required. In addition, a large extruder is required to ensure the adhesion of the two sets of stainless steel strips and aluminum strips, and as a result, the equipment becomes very complex and large. Inevitable. In addition, in a general ram type extruder, it is necessary to stop the extruder every time a billet is loaded into a container, and for this reason, the stainless steel clad aluminum trolley wire extruded by the extruder has localized 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 are pressure-bonded and integrated by roll rolling using a rolling device. Generally, when an aluminum strip and a stainless steel strip are pressed together by roll rolling, in order to make a sufficient metallurgical pressure contact between the two strips, the aluminum strip has a low deformation resistance during rolling. It is said that it is necessary to apply a rolling reduction rate (=working degree) of %. Based on this knowledge, a method of manufacturing a stainless steel clad aluminum trolley wire with the above structure has been studied. Since the thickness of the strip is 1 to 3 mm, the thickness of the aluminum strip used as the material is calculated backwards from 10 to 30 mm. On the other hand, the thickness of the stainless steel strip is the same as that of the raw material, 1 to 3 mm, because it is hard and does not deform. Here, when an aluminum strip with a thickness of 10 to 30 mm and a stainless steel strip with a thickness of 1 to 3 mm are rolled between a pair of flat rolls, and at that time a reduction rate of 40 to 80% is applied to the aluminum strip, Aluminum strips, which have significantly lower deformation resistance than stainless steel strips, not only plastically deform and elongate in the rolling direction, but also easily plastically deform and elongate in a direction perpendicular to the rolling direction, that is, in the roll axis direction. For this reason, even though a rolling reduction rate of 40 to 80% is applied to the aluminum strip, the rolling force acting between the aluminum strip and the stainless steel strip does not easily increase, resulting in the adhesion between the two strips. Power is at most 2~
The limit is 3Kg/ ^mm2 , and both conditions have the problem of easy peeling after pressure welding.

This will be explained with reference to FIGS. 3 and 4. In FIG. 3, a thick aluminum strip 1 and a thin stainless steel strip 2 are rolled through a pair of upper and lower flat rolls 3a, 3b. FIG. 4 is a front view showing the state of manufacture of a stainless steel clad aluminum trolley wire in which two parts are pressed together and integrated, and FIG. 4 is a plan view thereof. As already mentioned, it is necessary to apply a reduction rate of 40 to 80% to the aluminum strip 1 during rolling, but in this case, the thick aluminum strip 1 is rolled as shown in Figure 4. It is plastically deformed and elongated not only in the direction but also in the direction perpendicular to the rolling direction, that is, in the roll axis direction (spreads in the lateral direction). As a result, as shown in FIG. 5, the cross-sectional shape of the stainless steel clad aluminum strip 6 that has been pressure-welded by rolling has extra aluminum pieces on both sides of the stainless steel strip 2 of a predetermined width. As a result, the aluminum strip has a thinner wall thickness as a whole. Such a stainless steel clad aluminum strip 6 not only requires post-processing to remove excess aluminum pieces, but also requires pre-processing to remove excess aluminum pieces in order to secure the final aluminum thickness required for the trolley wire. You must use a very thick one that allows for the aluminum flakes.
Moreover, in the rolling method shown in FIGS. 3 and 4, the aluminum strip 1 and the stainless steel strip 1 are easily plastically deformed and elongated in the roll axis direction during rolling. As already mentioned, there is a problem in the adhesion between the two strips because the necessary and sufficient rolling force is not applied between the two strips. In addition,
As shown in Figure 3, depending on the type of trolley wire, a recess for gripping is sometimes provided on the side of the aluminum strip, but in this case, in the conventional method, the side of the stainless aluminum strip is later machined. There was no other option but to do so, and there were problems with the work process. One of the countermeasures is to use grooved rolls instead of flat rolls.

In the method using grooved rolls, the aluminum strip and stainless steel strip are pushed into the grooves of the grooved roll and rolled, thereby preventing the aluminum strip from elongating in the roll axis direction, resulting in bonding. You can improve your strength. However, with the method of using grooved rolls, preparing the grooved rolls as dedicated rolls not only requires a very expensive investment, but also cannot easily accommodate changes in the dimensions of the trolley wire in the width direction. Naturally, the structure must be weak in strength. Another problem is that it is very troublesome to strip the stainless steel aluminum strip from the groove, mainly due to seizure of the aluminum strip.

In view of the above, an object of the present invention is to easily control the plastic deformation and elongation of an aluminum strip in a direction perpendicular to the rolling direction, that is, in the roll axis direction, by a very simple method during rolling, and thereby It is possible to significantly improve the adhesion between the aluminum strip and the stainless steel strip, and at the same time form the side surface of the aluminum strip into a desired shape to produce a stainless steel clad aluminum strip with stable quality and a sound structure. The goal is to provide a method that can be used.

That is, the gist of the present invention is to provide a stainless steel clad aluminum strip in which a thin stainless steel strip with relatively high deformation resistance and a thick aluminum strip with relatively low deformation resistance are pressure-welded by roll rolling and integrated. In the manufacturing method, the stainless steel strip and the aluminum strip are overlapped and rolled through a pair of flat rolls, and at this time, the aluminum strip is rolled between the flat rolls in the roll axis direction ( A pair of stationary restraint plates are closely arranged at intervals in the axial direction of the roll so as to restrict plastic deformation (in a direction perpendicular to the rolling direction), and a projection is provided in the longitudinal direction of the restraint plate. The present invention provides a method for producing a stainless steel clad aluminum strip, which comprises rolling and simultaneously shaping the side surface of the aluminum strip into a desired shape.

Next, an embodiment of the method for manufacturing a stainless steel clad aluminum strip according to the present invention will be described with reference to FIGS. 1 and 2 of the accompanying drawings.

In Figures 1 and 2, 1 is a soft, thick-walled aluminum strip, 2 is a hard, thin-walled stainless steel strip, 3a and 3b are a pair of upper and lower flat rolls, and 4 is the flat rolls 3a and 3b. It is a rolling equipment.
Reference numeral 5 denotes a pair of restraining plates disposed between the flat rolls 3a and 3b, which prevent plastic deformation in a direction perpendicular to the rolling direction of the aluminum strip 1 in the plastic deformation region of the aluminum strip 1 passing between the rolls, that is, the rolls. It is arranged so as to restrict plastic deformation in the axial direction (width widening region or lateral elongation). Also, a projection is provided on its longitudinal side wall facing said aluminum strip 1. Therefore, the pair of restraining plates 5
The distance is the same as the width of the aluminum strip 1 and the stainless steel strip 2 as raw materials.

To explain the above method in detail, an aluminum strip 1 having a thickness of 16 mm, for example, is cleaned with a tri-cleaner and wire brushed before being sent to the rolling machine 4 for 100 to 500 millimeters.
While supplying the aluminum strip 1 heated to 100°C, a 2 mm thick stainless steel (SUS304) strip 2 was heated to 100 to 200°C after being washed with trichane and wire brushed in the same way as the aluminum strip 1. supply something. The arrangement of the restraint plate 5 is as described above, and the aluminum strip 1 and the stainless steel strip 2 are passed between the flat rolls 3a and 3b.
It is rolled and pressure-welded to form a single piece. At this time, the aluminum strip 1, which has significantly lower deformation resistance than the stainless steel strip 2, is largely plastically deformed and stretched in the rolling direction. regulated.
For this purpose, the aluminum strip 1 is rolled by roll rolling.
The force for plastic deformation at a reduction rate of 40 to 80% is not lost due to the elongation of the aluminum strip 1 in the roll axis direction, and as a result, a necessary and sufficient reduction is achieved between the aluminum strip 1 and the stainless steel strip 2. The force acts and the adhesive force between the two becomes extremely strong.
In addition, the cross-sectional shape of the stainless steel crucified aluminum strip 6 obtained through the rolling device 4 is such that the aluminum strip 1 and the stainless steel strip 2 have the same width, and the aluminum strip 1 has a side surface formed by the restraining plate 5. However, it has a shape with a recess in the longitudinal direction.

According to this embodiment, as described above, the force that plastically deforms the aluminum strip 1 and presses it against the stainless steel strip 2 due to roll rolling is suppressed by the presence of the restraint plate 5, which causes the aluminum strip 1 to move in the roll axis direction. Since there is no elongation, the amount increases significantly compared to the case of using only flat rolls 3a and 3b. At the same time, at this time, the plastic deformation elongation of the aluminum strip 1 acts more strongly in the rolling direction, and the elongation speed distribution has a large speed difference in the width direction of the aluminum strip 1. In addition, a large relative slip occurs between the stainless steel strip 2 and the aluminum strip 1, which greatly contributes to an increase in the adhesive force between them.

As described above, according to the method for manufacturing a stainless steel clad aluminum strip of the present invention, plastic deformation and elongation in the roll axis direction due to rolling of the aluminum strip passing between the pair of flat rolls is controlled as described above. By rolling a pair of stationary restraining plates closely spaced apart in the roll axis direction, a thick aluminum strip and a thin stainless steel strip can be easily rolled by preparing and arranging the restraining plates. The aluminum strips can be firmly pressed together with sufficient adhesive force, and by providing projections on the restraining plate, the sides of the aluminum strip can be easily formed into a desired shape at the same time as rolling. As a result, a stainless steel clad aluminum strip having a stable quality and a sound structure can be easily manufactured in an extremely efficient and economical manner.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the method for producing stainless steel clad aluminum strips of the present invention, FIG. 2 is a cross-sectional view of the main part of the same explanatory diagram, and FIGS.
All figures are illustrations of conventional examples. 1: aluminum strip, 2: stainless steel strip,
3a, 3b: flat roll, 4: rolling device, 5: restraining plate, 6: stainless steel clad aluminum strip.

Claims (1)

[Claims] 1. A method for manufacturing a stainless steel clad aluminum strip in which a thin stainless steel strip with relatively high deformation resistance and a thick aluminum strip with relatively low deformation resistance are pressure-welded and integrated by roll rolling. The aluminum strips are overlapped and rolled through a pair of flat rolls, and at this time, plastic deformation in the roll axis direction (direction perpendicular to the rolling direction) due to the rolling of the aluminum strip passing between the flat rolls is caused. A pair of stationary restraint plates are closely arranged at intervals in the axial direction of the roll so as to restrict rolling, and by providing protrusions in the longitudinal direction of the restraint plates, the side surfaces of the aluminum strip can be rolled at the same time as desired. 1. A method for producing a stainless steel clad aluminum strip, characterized by forming it into a shape.