JPH0127897B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rigid trolley used as a conductor for contact current collection in mobile equipment such as high-speed transportation, and in particular, the main body providing rigidity is made of a lightweight and conductive aluminum shape. Al/SUS, with a wear-resistant stainless steel strip coated longitudinally on the profile to replace the contact of the current collector attached to the mobile equipment. This invention relates to a composite metal-bonded rigid trolley.

Conventionally, this type of rigid trolley has been known to be the easiest to manufacture, in which a stainless steel strip is connected to an aluminum profile by mechanical coupling, that is, a mechanical clamp.

However, with conventional means, a stainless steel strip is bent into a substantially U-shaped cross section and placed over an aluminum body, and both bent edges of the strip are riveted to the sides of the aluminum body. Alternatively, the two side edges were placed in a groove in the aluminum main body and the flange portions defining the groove were crimped and clamped.

However, although each of the above-mentioned means seems to be satisfactory as a mechanical connection, there is a problem in obtaining stable electrical continuity. In other words, stainless steel strips are extremely hard, and if they are simply bent, they will undergo elastic return (spring back) by the amount of deformation they undergo when bent, and this will work to weaken the holding force of studs and flanges. , and the pressing force of the stainless steel strip against the aluminum main body is reduced. Additionally, rivets and flange tightening can become loose due to sliding of the current collector, etc., and the addition of such elastic return force may easily cause the stainless steel strip to peel off. It was hot.

In addition, in these methods, electrical continuity is achieved by bringing the stainless steel strip into contact with the aluminum body, which is a dissimilar metal. When moisture infiltrates, dissimilar metals will corrode, i.e., the aluminum body, which has a strong tendency to ionize, will corrode, and there is also a concern that the stainless steel strip may fall off, especially if the flange corrodes and breaks off. Ta.

Conventionally, the problem of corrosion caused by contact with different metals has been solved by interposing an anticorrosive compound between the stainless steel strip and the aluminum main body, or a metal tape made of a material such as zinc, which has an ionization tendency between those metals. Attempts were made to resolve the issue.

However, these anti-corrosion measures do not completely prevent coating spots and corrosion, which may impair reliability and may also cause new problems. In other words, these anti-corrosion compounds and tapes prevent contact between the stainless steel strip and the aluminum body, which may reduce electrical continuity, and when the current collector slides on the stainless steel strip, A gap is likely to be formed between such inclusions and the stainless steel strip material and the aluminum main body due to vibrations received by the product, which may reduce the fixing force of the riveted portion or the crimped portion of the flange.

The present invention solves the problems of the prior art mentioned above,
An aluminum profile that serves as a bending rigid member and a stainless steel strip that serves as a sliding member that is folded and fixed to the aluminum profile are mechanically constructed to simultaneously prevent corrosion due to dissimilar metals and provide stable electrical continuity. The object of the present invention is to provide a composite metal-bonded rigid trolley by bonding.

That is, the composite metal bonded rigid trolley of the present invention comprises an aluminum profile with high bending rigidity and an aluminum/stainless steel composite strip formed by integrally forming a thin aluminum layer on one side of a stainless steel strip. Consisting of each element, the aluminum/
The stainless steel composite strip is bent into a substantially U-shaped cross section so that elastic return does not occur, so that the stainless steel strip is on the outside and the aluminum thin layer is on the inside, and applied to the side of the aluminum profile. It is covered with only a thin layer of aluminum in contact without contacting the stainless steel strip, and furthermore,
The outer stainless steel strip is partially pushed inward with plastic deformation at both side edges extending through the left and right bent parts of the covered composite strip, and the inner It is characterized in that the aluminum thin layer is connected to the side surface of the aluminum profile in a state where it is partially pushed and deformed into the side surface of the aluminum profile.

As mentioned above, the applicant had previously made several proposals regarding the use of so-called Al/SUS clad material, which is a stainless steel strip with an aluminum layer formed on one side. However, there was still room for improvement in the bonding structure of the aluminum-clad stainless steel strip to the aluminum profile.

That is, as one means, as shown in FIG.
(Japanese Patent Application No. 166961/1983).

Another method, as shown in Figure 1B, is to fit both side edges of the Al-SUS clad strip 1' into the grooves 2'a, _2'a of the aluminum profile 2 _' . and tighten the flanges 2 _b and 2 _b defining the groove inward to fix the band 1' (patent application
55-166962).

However, in the former case, the thickness of the aluminum strip 1a of the clad strip 1 has to be increased due to edge welding, which increases the bending rigidity of the entire strip in the thickness direction. Even if the stainless steel strip is bent to the extent that it becomes difficult to cover by bending and causes plastic deformation of the stainless steel strip, elastic return is likely to occur due to the large thickness of the aluminum strip. ,
There was a risk that the strip material would peel off. In the latter case, although it is possible to make the aluminum strip 1'a of the cladding strip 1' thinner, it is possible to make the aluminum strip _1'a of the cladding strip 1' thinner, but the dissimilar metal contact portion between the stainless steel strip and the aluminum strip is formed by tightening the flange. As a result, the corrosion problem has not been fully resolved. In particular, since the flange is an important part for gripping the stainless steel strip and press-fitting it to the aluminum profile, such corrosion can be said to be a major problem in maintaining long-term reliability.

The present invention has been made to solve these problems and achieve the intended purpose.

That is, the stainless steel strip is vertically attached to the aluminum body with the aluminum strip, which has been integrated with itself in advance by clad bonding, being in direct contact with the aluminum body, and the stainless steel strip is attached to both sides of the aluminum strip. By bending the stainless steel strip to the extent of plastic deformation and covering it with a bent part formed to prevent elastic return, electrical conduction is achieved without direct contact between the stainless steel strip and the aluminum body. It was something we were able to do together. Furthermore, since the aluminum strip that is clad-bonded to the stainless steel strip can be made sufficiently thin, it is possible to eliminate the risk of giving any assistance that would cause elastic return to the stainless steel strip. can.

Therefore, the aluminum strip is no longer in contact with the aluminum main body due to the plastically deformed bent portion of the stainless steel strip without elastic return.

Furthermore, the outer stainless steel strip is plastically inward at both side edges extending through the left and right bending members of the Al/SUS composite strip, which is covered with the Al/SUS composite strip so as to prevent elastic return as described above. Partial pushing deformation accompanied by deformation is applied, and the inner thin aluminum layer is brought into contact with a voltage while biting into the side surface of the aluminum profile at the partially pushing deformed part of the stainless steel strip. ing. By doing this, the thin aluminum layer of the Al/SUS composite strip and the aluminum profile are mechanically integrated, and the aluminum oxide layer on the aluminum surface, which is generally electrically insulating, is destroyed. In addition to the mechanical bonding, electrical continuity between the aluminum shaped material and the thin aluminum layer in the Al/SUS composite strip is ensured.

Furthermore, due to the inwardly pushed plastic deformation of both side edges of the stainless steel strip, the aluminum thin layer clad bonded to the inside thereof bites into the aluminum profile and is electrically connected to the aluminum profile. , the moisture that enters from the edge of the Al/SUS composite strip is dammed up, and moisture is not allowed to infiltrate inward. This eliminates the risk of erosion of the contact area between the strip material and the aluminum profile.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be specifically described with reference to drawings.

FIG. 2 shows an exploded view of the components of the composite rigid trolley according to the present invention.
is a composite strip made by integrating a stainless steel strip 11 such as SUS304 or SUS430 and an aluminum strip 12 such as pure Al or 1050 alloy Al by clad bonding, and the other 20 is 6000
It is an aluminum shaped material that is made of a material such as alloy Al and is extruded to have a predetermined cross-sectional shape.

The aluminum profile 20 has an I-shaped cross section so as to obtain a predetermined bending rigidity, and on both sides extending in the longitudinal direction, a seat 21 for attaching a support insulator is formed on one side, and a seat 21 is formed on the other side. A head 22 is formed on which the composite strip 10 is applied. This item is defined as a unit in length from several meters to more than ten meters. On the other hand, the composite strip 10 includes a stainless steel strip 11 selected to have a width enough to cover the head 22 and a predetermined thickness, and an aluminum strip 12 of a small arbitrary thickness.
After the surface has been cleaned by brushing, tri-cleaning, etc., the aluminum is piled up and fed to a roll mill, and the aluminum is rolled and welded with plastic deformation to produce a specified clad bonding strip. For example, the finished shape of the stainless steel strip 11 is the same as the original thickness, which is 2 mm.
The aluminum strip 12 is 1 mm thinner than that. An overlay type with the same width for both strips may be used.

Since this material is sufficiently thin, it can be obtained as a long product of several hundred meters by rolling and welding and then coiling.

In this way, the aluminum main body 20 and the coiled long composite strip material 10, which are manufactured separately and made into a unit, are preferably transported to the installation site as they are, and first, a large number of them are transported to the installation site as they are. The ends of the aluminum main body 20 of the book are sequentially connected to form a series of elongated bodies, and a long single strip of composite strip material 10, which has been coiled, is fed out from above this combined elongated body and straightened by a roller. After straightening, the stainless steel strip 11 is bent to have a substantially U-shaped cross section so as to be plastically deformed, and then used for vertical attachment to the aluminum main body 20. In this way, there will be no seam in the sliding portion of the current collector.

FIG. 3 shows the connection structure of the composite rigid trolley thus synthesized.

That is, as described above, the composite strip 10' is placed on the head of the aluminum main body 20 by bending and forming the stainless steel strip into a generally U-shaped cross section with plastic deformation. By continuously pressing with a roll, the stainless steel strip material 1
Indentation deformation part _11'a with plastic deformation at 1',
The part of the aluminum strip 12 _' that is pushed inward by the pushing deformation parts 11' _a and 11' _a that have no elastic return forms the head part of the aluminum profile 20. It bites into both sides of 22. Reference numeral 22a indicates a portion connected to the head 22 of the aluminum profile 20, which is formed by such pushing deformation of the aluminum strip 12'.

According to the present invention, the bonding strength of such biting portions is further increased. That is, a voltage is applied between the left and right rolls forming the left and right push-deformed parts _11'a , _11'a of the stainless steel strip material, and the push-deformed parts _11'a , _11'a sandwiched between the rolls are By energizing, a current is applied through the contact portion between the thin aluminum layer 12' inside the push-deformed portions 11' _a and 11' _a and the side surface of the head 22 of the aluminum profile into which it is bitten. flow,
The contact portion is heated and bonded by Joule heat generated by the contact resistance, which is what is called a current-current welding.

As mentioned above, the aluminum thin layer 1 is pre-bonded and integrated on the inside of the stainless steel strip 11'.
2' bites into the side surface of the head 22 of the aluminum profile 20, and since this part is connected to a current, the oxide film formed on the surface of each member is destroyed and sufficient electrical continuity is established. A guaranteed bond is obtained. Furthermore, such a bond with biting and current-carrying contact has the same effect as forming a barrier (weir) that does not allow the passage of infiltrating moisture.
This is extremely effective in preventing deterioration of electrical and mechanical bonding due to moisture infiltration.

As explained above, according to the composite metal bonded rigid trolley of the present invention, there is an aluminum profile serving as a bending rigid member and a stainless steel strip serving as a slidable member that is bent and fixed to the aluminum profile. The problem of corrosion due to contact with dissimilar metals is solved by contacting the stainless steel strip through a thin aluminum layer that is pre-bonded on one side of the stainless steel strip, and the stainless steel strip is made of aluminum by bending. The covering of the profile is carried out in such a way that elastic return displacement of both side edges extending further from the bent part is prevented by plastic deformation of the bent part of the profile, and the stainless steel strip material is As a result, the thin aluminum layer on the inside bites into the side surface of the aluminum profile, and this part is connected to the energizing voltage. Stable electrical continuity between the material and the material can be ensured. Therefore, the intended purpose of providing a composite metal-bonded rigid trolley that satisfies corrosion prevention due to dissimilar metals and stable electrical continuity at the same time has been more than achieved and is of great practical value.

[Brief explanation of drawings]

Figures 1A and 2B are explanatory cross-sectional views showing an example of a composite metal-bonded rigid trolley previously proposed by the applicant, and Figure 2 is a cross-sectional view showing the constituent elements of the composite metal-bonded rigid trolley of the present invention. The explanatory drawing and FIG. 3 are cross-sectional explanatory views showing an example of a composite metal-coupled rigid body trolley of the present invention constructed by combining the same constituent elements as above. In the figure, 10' is an Al/SUS composite strip, 11' is a stainless steel strip, _11'a is a pushing deformation part,
12' is an aluminum strip (thin layer), 20 is an aluminum profile, 22 is a head, and 22a is a biting and voltage-conducting part.

Claims (1)

[Claims] 1 Consists of the following elements: an aluminum profile with high bending rigidity and an aluminum/stainless steel composite strip formed by integrally forming a thin aluminum layer on one side of a stainless steel strip;
The stainless steel composite strip is bent into a substantially U-shaped cross section so that elastic return does not occur, so that the stainless steel strip is on the outside and the aluminum thin layer is on the inside, and applied to the side of the aluminum profile. It is covered with only a thin layer of aluminum in contact without contacting the stainless steel strip, and furthermore,
The outer stainless steel strip is partially pushed inward with plastic deformation at both side edges extending through the left and right bent parts of the covered composite strip, and the inner A composite metal bonded rigid body trolley, characterized in that a thin aluminum layer is connected to the side surface of the aluminum section in a state where the aluminum thin layer bites into the side surface of the aluminum section at a partially pushed-deformed portion of the stainless steel strip.