JP2570310B2 - Composite conductor for sliding current collection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sliding current collector composed of a composite of a highly conductive metal profile such as aluminum and a wear-resistant metal strip such as stainless steel. The present invention relates to improvement of a composite conductor.

[Conventional technology]

Conventionally, in the case of trolley wires or train wires, the main body is made of aluminum shaped material to make it easy to handle with high conductivity and light weight, and stainless steel to improve wear resistance There is a so-called aluminum-stainless composite conductor in which a current collector sliding portion is formed by a band material. In this case, between the dissimilar metal portions of the aluminum shape material and the stainless steel band material, the current collector slides sufficiently. It is necessary to endure the physical joining force and stable electrical continuity that can withstand, and various proposals have been made in the past in order to meet these conditions and join such an aluminum shape and a stainless steel strip. I have.

Among them, a roll-rolling welding method is one which can be carried out particularly on an industrial scale and which can achieve metallurgical joining between dissimilar metal parts of aluminum and stainless steel. This utilizes the property that aluminum is soft and one of the stainless steels is hard.A strip of stainless steel and an aluminum strip of a suitable size are introduced between rolling rolls so that they overlap each other, and the aluminum strip is introduced. In this method, a predetermined cross-sectional shape is obtained by plastic deformation, and press-integration with a stainless steel strip is performed based on its own plastic deformation due to the predetermined rolling force.

By the way, in such a composite conductor, a stainless steel strip having a rectangular cross section has been conventionally used, and an aluminum strip is rolled and pressed on one strip face and both side edges, and the remaining strip is left. One band surface was set as a current collector sliding surface.

FIG. 6 shows an example of the composite conductor obtained as described above. A stainless steel strip SUS having a flat rectangular cross section collects a band surface 1 bulging in an arc shape in a curved shape in an arc shape. The sliding surface is set, and the aluminum material Al is integrated with the strip SUS while being pressed against the recessed strip 2 and both side faces 3, 3 of the strip SUS. .

[Problems to be solved by the invention]

As described above, for the stainless steel strip SUS having a flat cross section, the aluminum strip Al is roll-pressed to one strip face 2 and both side face faces 3 and 3 by its own plastic deformation. The rolling force on the belt surface 2 is sufficient, but both side edges
There was a tendency that the rolling force to 3,3 was insufficient, and it was difficult to obtain a material having a stable physical bonding strength to the both side surfaces 3,3 of the aluminum shape material Al.

The both side surfaces 3, 3 slightly face the direction in which the roll rolling force acts due to the bow-shaped curvature of the strip SUS itself, but the highly conductive metal material Al due to the roll reduction applied thereto.
As shown in FIG. 7, assuming that the pressure applied to the band surface 2 is F, the pressure f applied to the side edge surfaces 3 is f = F sin (θ /
2), and the center angle θ of the arc in the strip is considerably small, so that f << F and a sufficient rolling force cannot be obtained.

Insufficient rolling force on both side edges like this
This is not a problem when the SUS is thin, but when a thick stainless steel strip is selected to extend the wear life, the pressure bonding strength of the aluminum profile to both side edges is insufficient. However, there is a need for further improvement in terms of stabilizing the joint between dissimilar metals between aluminum and stainless steel.

The present invention, in view of the situation of the prior art, comprises a highly conductive metal profile such as aluminum and a wear-resistant metal strip such as stainless steel, and the highly conductive metal profile undergoes its own plastic deformation. In a composite conductor having a structure that is roll-welded to the band surface and both side edges of a wear-resistant metal band based on the above-mentioned structure, this type of metal can uniformly and sufficiently bond the highly conductive metal profile to the band. The purpose is to provide a composite conductor.

[Means and actions for solving the problems]

In order to achieve the above object, the composite conductor of the present invention is provided with an obtuse angle between a ridge portion of one of the band surfaces and both side surfaces to be a rolling contact surface of a highly conductive metal profile in a wear-resistant metal band. The two side surfaces are inclined so as to positively oppose the direction of pressing the highly conductive metal profile.

As described above, the both-side edges of the wear-resistant metal strip having substantially no plastic deformation are subjected to the plastic deformation by a predetermined rolling force, so that the highly conductive metal section rolled and pressed against the strip is rolled. Since it is inclined to positively oppose in the direction, the rolling contact force of the highly conductive metal profile to the both side edges can be brought closer to the contact force to the band surface of the same material,
The physical bonding strength between dissimilar metals is significantly improved.

For example, for example, the wear-resistant metal strip is formed in a substantially trapezoidal cross section, and the strip having the largest width is set as the current collector sliding face, and the strip having the smaller width on the opposite side and the taper on both side edges are set. It is suitable for the surface to be a rolling contact surface of a highly conductive metal profile.

By selecting the angle at the ridge between the belt surface on which the highly conductive metal profile is rolled and pressed and the side edge surfaces in the range of 135 ° to 150 °, a suitable intermetallic bond can be obtained.

In addition, by providing small projections at the ridge corners between the strip surface serving as the rolling contact surface of the highly conductive metal profile and both side edges, the wear-resistant metal strip can be integrated with the highly conductive metal profile. Can be further improved.

In addition, the wear-resistant gold band material not only achieves good current collection by curving in a bow shape so that the band surface that sets the current collector sliding surface bulges in an arc shape, but also on both sides. The direction of the edge surface can be made closer to the direction of the belt surface, and further improvement of the intermetallic bond can be expected.

The composite conductor obtained as described above can be used for overhead lines such as a trolley line or a train line and can be provided. In addition, it can also be used as a rigid trolley. For this purpose, a highly conductive metal profile is rolled and pressed onto such a wear-resistant metal profile, and a second profile having bending rigidity unevenly coupled to the second profile. It is good to configure.

〔Example〕

1 to 4 show examples in which the sliding current collecting composite conductor according to the present invention is embodied as a rigid trolley.

As shown in FIG. 4, the composite conductor 10 completed as a rigid trolley is made of a wear-resistant metal strip SUS made of SUS 304 stainless steel and a highly conductive metal section Al made of an aluminum alloy of A6063. The highly conductive metal profile Al is a first profile Al ₁ integrally joined to the wear-resistant metal strip SUS by rolling pressure welding, and a second profile which is unevenly bonded to the first profile Al _1. consisting of wood Al ₂ Metropolitan. Therefore, a composite profile is formed by the first profile Al ₁ and the wear-resistant metal strip SUS. The second section Al ₂ has a cross-sectional shape of approximately I by an aluminum extruder.
It is extruded so as to have a predetermined bending rigidity as a letter shape, but is sufficiently hardened by heat treatment.

As shown in FIG. 2, the wear-resistant metal strip SUS is a strip having a rectangular cross section having a thickness t of 3 mm and a width 1 of 23 mm. Finished by tapering. One band surface 11 having a maximum width of 23 mm is set as a current collector sliding surface, and a band surface 12 having a small width opposite thereto and tapered side edge surfaces 13 extending from both ends thereof. , 13, the first section Al ₁ is joined.

The width of the band surface 12 serving as the joining surface is about 17 mm, and the angle θ ₁ of the ridge corner portions 14 and 14 between the surface 12 and the side edge surfaces 13 and 13 is
There is 135 ゜. Therefore, the length of the tapered side edge 13 is about 4.2
4 mm.

Such a wear-resistant metal band material SUS is slightly curved so that the band surface 11 set for current collector sliding swells in an arc shape by a manufacturing method described later.
The first shape Al ₁ has a concave band surface 12, and a tapered side edge surface 13, which extends on both sides of the band surface 12 as an inclined state refracted to an angle larger than the angle 135 ° of the ridge corner portion 14, 13 are joined.

The wear-resistant metal strip SU in the composite conductor 10 as described above
To produce the composite profile of S and first profile Al _1, as in the Figure 2, soft not heat treated to form a first profile Al ₁ a material Al ₁ ', tabular Abrasion-resistant metal strips SUS are prepared, these are cleaned, and one of the raw materials Al ₁ ′ is preheated at an appropriate temperature, for example, 400 ° C., and introduced into a rolling press roll in a state of overlapping each other. You.

FIG. 3 shows a rolling pressure welding state after such an introduction state. Rolling pressure welding rolls are all made of cast steel,
Lower roll 15 on the side receiving the one wear-resistant metal strip SUS
Has a circumferential groove 15a having a concave surface in contact with the wear-resistant metal strip SUS, and the upper roll 16 on the side receiving the other high-conductive metal material Al ₁ ′ is made of a high-conductive metal material Al 1 'has a peripheral projection 16a which fits into the upper groove 17, its peripheral projection 16a the material Al ₁ not only as a forming surface' ₁ is also serve as guides for introduction in the correct posture. Those grooved rolls
Between the roll 15 and the convex roll 16, a restraining plate 18 that also functions as a forming jig by preventing the flow between the rolls in the axial direction when the introduced highly conductive metal material Al ₁ ′ is rolled. , 18 have been intervened. Therefore, the highly conductive metal material A introduced together with the wear-resistant metal strip SUS in the front and back direction on the drawing
l ₁ ′ is formed between the restraining plates 18, 18 and by applying a rolling force between the rolls 15, 16 to be plastically deformed and formed into the shape of the first shape Al ₁ as a highly conductive metal shape. Then, rolling welding is performed on the wear-resistant metal strip SUS. Wear resistant metal strip SUS, by receiving a first pressure profile Al ₁ due to reduction of the roll, pressed against the circumferential groove 15a of the lower roll 15, is curved in a bow shape with. A concave band surface that is oriented as a joining surface when so curved
The 12 and both side edge surfaces 13 and 13, the first profile Al ₁ to be plastically deformed is pressed integrated by the direction pressure, such as an arrow.

In this way, not only the band surface 12 but also the surfaces 13
Are positively opposed in the direction of pressure welding, so that a homogeneous metallurgical bond between the dissimilar metals is obtained over the front surface.

The composite shaped material configured as described above can be manufactured to be long and bendable. Therefore, it is preferable to wind it up on a drum or the like and stock it. Such a long composite profile can be adopted as an overhead line by processing the highly conductive metal profile Al ₁ into an appropriate cross-sectional shape, but in this example, a sliding member as a rigid trolley Applied to

Such a composite profile is cut and selected in accordance with the length of the second profile Al ₂ to be a fixed length product, and the wedge-shaped projections 19 of the second profile Al ₂ are placed in the first profile as shown in FIG. By inserting into the concave portion 17 of the profile Al ₁ and crimping the ear portions 17a, 17a on both sides of the concave portion 17, the coupling and integration of the first profile and the second profile are performed, and as a rigid trolley Provided.

FIG. 5 shows a modified example of the composite conductor according to the present invention. In the wear-resistant metal strip SUS ′ having a basic shape of a substantially trapezoidal cross section as in the above-described embodiment, as in the above-described embodiment, both side edge surfaces 13 'strip surface becomes rolling contact face 12' highly conductive metal profiles AL ₁ also becomes the first profile and being tapered ', 1
Small projections 20, 20 are formed at the ridges 14 ', 14' between the 3 'and the 3', so that they are plastically deformed and bite into the highly conductive metal material Al ₁ 'coming into rolling contact. It is positioned.

The small protrusion 20 is provided on the side edge surface 13 ′ of the highly conductive metal profile.
It is sufficient to protrude at a height and shape that does not affect the pressure welding of Al ″, and by protruding slightly outward as shown in the figure, it is possible to exhibit a wedge effect on the highly conductive metal profile Al ₁ ′. it can.

As described above, the addition of the small projections 20 can improve the bonding between different metals between the wear-resistant metal strip SUS ′ and the highly conductive metal profile Al ₁ ″ to a more firm one, and particularly severe Suitable for sliding current collection.

It should be noted that the above embodiments are merely examples to the extent that they get tired. It goes without saying that various changes and applications can be made within the scope of the technical idea of the present invention.

〔The invention's effect〕

As described above, according to the sliding current collecting composite conductor of the present invention, the other band surface of the wear-resistant metal band material having one band surface set as the current collecting sliding surface and Rolling pressure welding integrated by plastic deformation of the highly conductive metal profile on both side edges, and rolling integration of the high conductivity metal profile on the both sides is brought close to that of the belt surface. , Which is obtained by homogenizing the stable intermetallic bond over the entire surface,
This type of composite conductor has a large contribution to improving reliability.

[Brief description of the drawings]

1 to 4 show an embodiment of a composite conductor for sliding current collection according to the present invention. FIG. 1 is an explanatory cross-sectional view of an aluminum-stainless composite profile, and FIG. 2 shows the same profile. FIG. 3 is an explanatory view showing a rolling contact state of the same shaped material, and FIG. 4 is an explanatory sectional view showing a completed composite conductor. FIG. 5 is an explanatory sectional view showing a modified example of the composite conductor according to the present invention. FIG. 6 is an explanatory sectional view of a conventional composite conductor, and FIG. 7 is an explanatory view showing a pressure distribution state on a wear-resistant metal strip in the composite conductor. Al, Al ₁ ': Highly conductive metal profile, SUS, SUS ₁ ': Wear-resistant metal strip, SUS ₁ : First profile, SUS ₂ : Second profile, 10: Composite conductor, 1
1,11 ': Strip surface (sliding surface), 12,12': Strip surface (joining surface), 1
3,13 ': Side edge (joining surface), 14,14': Ridge, 15,16:
Rolling roll, 17: recess, 18: restraint plate, 19: wedge-shaped projection, 2
0: Small protrusion.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Jiro Noda 5-1-1, Hidakacho, Hitachi City, Ibaraki Prefecture Inside the Hidaka Works, Hitachi Cable Co., Ltd. (72) Inventor Tadashi Kimura Hidakacho, Hitachi City, Ibaraki Prefecture 5-1-1, Hidaka Electric Wire Co., Ltd. (72) Inventor Tadashi Horiguchi 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture Hidaka Electric Wire Co., Ltd. (72) Inventor Hirano Katsuyuki 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture Inside the Hidaka Factory, Hitachi Cable Co., Ltd. (72) Koji Okita 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture Hitachi Cable, Ltd. Inside the factory (56) References JP-A-52-39193 (JP, A) JP-A-63-93639 (JP, A) JP-A-57-25619 (JP, A) ) Actually open sho 59-186136 (JP, U) 502 (JP, B1)

Claims (7)

(57) [Claims] 1. A highly conductive metal profile (Al, Al ₁ ) that is soft enough to undergo plastic deformation at a given rolling force, and hard wear resistance that does not accompany plastic deformation under rolling conditions under the same conditions. Metal strip (SUS), and the highly conductive metal section is formed on one side (12) and both side edges (13,1) of the wear-resistant metal strip based on its own plastic deformation.
3) is roll-welded to the other strip surface (1
1) A composite conductor in which 1) is set as a current collector sliding surface, wherein a ridge angle between one of the band surfaces serving as a rolling contact surface of the highly conductive metal profile in the wear-resistant metal band and both side surfaces. Department (14,1
4) The composite conductor for sliding current collection, wherein the oblique angle is set to 4), and both side surfaces are inclined so as to positively oppose the rolling contact direction of the highly conductive metal profile. 2. The abrasion-resistant metal strip has a substantially trapezoidal cross section, the largest width of the strip is set as a current collector sliding face, and the width of the reaction-side strip and the width of both sides are smaller than that. 2. The composite conductor for sliding current collection according to claim 1, wherein the tapered surface is a rolling contact surface of a highly conductive metal profile. 3. The abrasion-resistant metal strip has small projections (20, 20) at the ridges between the strip surface serving as the roll-welding joining surface of the highly conductive metal profile and the inclined surfaces on both side edges. The sliding current collecting composite conductor according to claim 1 or 2, wherein 4. The abrasion-resistant metal strip material is curved in an arc shape such that a strip surface set as a current collector sliding surface swells in an arc shape. One of the three items
9. The composite conductor for sliding current collection according to item 1. 5. A patent wherein the angle of a ridge between one of the strip surfaces, which is a rolling contact surface of the highly conductive metal profile in the wear-resistant metal strip, and both side edges is 135 ° to 150 °. The composite conductor for sliding current collection according to any one of claims 1 to 4. 6. The high-conductive metal profile is made of an aluminum alloy comprising A6063, and one of the wear-resistant metal strips is made of SU.
The composite conductor for sliding current collection according to any one of claims 1 to 5, wherein the composite conductor is made of stainless steel made of S304. 7. The high-conductive metal profile comprises a first profile (Al ₁ ) directly rolled and pressed against the wear-resistant metal strip, and a predetermined profile which is unevenly bonded to the first profile. bending the second profile (Al ₂₎ consisting of a claims first paragraph 6 wherein any one sliding current collector composite conductor according to having rigidity.