JPH0654405A - Aluminum alloy material for supporting slide plate - Google Patents

Abstract

PURPOSE:To reduce electric characteristics of a bolt clamping part and particularly an increase in a resistance by reducing an increase in a weight to a minimum limit and preventing a plastic deformation due to the clamping. CONSTITUTION:A current collecting shoe 1 clamped fixedly at a slide plate 4 by a bolt 8 is manufactured by an aluminum alloy extrusion molded material of a U-shaped section, and thick parts are formed at a slide plate mount 10 and both ends 11 to be clamped fixedly. The material for supporting the plate contains 0.6-1.2% of Mg, 0.4-1.3% of Si, 0.05-0.4% of Cu, and one or more of metals of 0.05-0.15% of Cr, 0.05-0.5% of Mn, 0.05-0.15% of Zr.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current collector slide plate support material, particularly an aluminum alloy material, which is attached to a pantograph for railway vehicles such as trams and subways.

[0002]

2. Description of the Related Art Conventionally, a pantograph has been used as a current collector for overhead lines in high-speed vehicles. In a pantograph, a sliding plate support member is mounted on a foldable rhombic link device by a spring, and a current collecting sliding plate is fixed on the upper surface of the sliding plate support member by a fastening means such as a bolt, and is fastened. A structure in which the sliding plate and the sliding plate support member are electrically connected via a means, and is configured to collect current by raising the link device by air, a spring, or the like to bring the sliding plate into contact with the overhead wire when in use. (Example;
Japanese Utility Model Laid-Open No. 1-159001, JP-A-62-181604.
No.

In order to perform stable and sufficient current collection at high speed during traveling, it is important to improve the followability of the pantograph to the overhead wire. For that purpose, it is desirable to minimize the mass of the link device that is the movable part, and a light metal made of an aluminum-based material is used for the link constituting frame pipe, the sliding plate supporting member, and the like.

2 to 4 show a conventional example of a sliding plate supporting member installed on such a pantograph. 1 is a sliding plate supporting member, 2 is an overhead wire, and 3 is a sliding plate supporting member 1. Connecting frame 4 is a sliding plate. The sliding plate support member 1 is manufactured by molding an aluminum alloy plate material having a proof stress of 20 kg / mm ² or more for the convenience of processing (thin-wall precision extrusion, difficulty of processing a profile) and economy, and most of them are thick. 1.5m
m ~ 3 mm, width 80 ~ 150 mm, length 200
Although it extends to 0 mm, the cross-sectional shape is a U-shape or an inverted U-shape that opens downward to ensure lightweight and rigidity, and both ends are curved downwards for the guideline to form a boat shape. Therefore, it is usually called a boat or a current collector (hereinafter referred to as a current collector). And this collector boat 1
Are parallel to each other and orthogonal to the overhead wire 2, and both ends thereof are connected by the connecting frame 3. On the upper surface, a plurality of screw mounting holes 5 are appropriately spaced in the longitudinal direction. And a plurality of them are formed. On the other hand, the current collecting slide plate 4 that constitutes the contact portion with the overhead wire 2 is often made of a copper-based sintered alloy because of its wear resistance and arc resistance, and it is in use. Since wear is unavoidable and it is necessary to replace it regularly or at any time, a bolt 8 is inserted into the screw mounting hole 5 from below via a spring washer 6 and a flat washer 7.
Is fastened and fixed to the upper surface of the collector boat 1. Sliding plate 4
As the material of, a conductive material such as copper, steel, aluminum and carbon, or a carbon / metal composite material such as copper, iron and carbon is used. The bolt 8 is usually made of a copper alloy, and when fastening, a paste-like compound 9 is applied in advance on the joint surface between the current collector 1 and the sliding plate 4, particularly near the bolt fastening portion. In addition,
The reason why the copper alloy bolts 8 are used is that electrical continuity between the current collector boat 1 and the sliding plate 4 is secured by the bolts 8 and the contact pressure by the tightening force of the bolts 8. This is because the contact pressure is the strongest, and the contact pressure decreases with increasing distance from the bolt fastening portion, and it is almost impossible to expect conduction.

[0005]

As described above, the current collecting boat 1
When the sliding plate 4 and the sliding plate 4 are bolted together, the electric current tends to concentrate mainly under the fastening portions of these members, and as shown by the curve A in FIG. 5, generally, the contact pressure (tightening torque) of the bolt fastening portion. ) Becomes higher, the electric resistance decreases, and it is common that the electric resistance is saturated at a pressure higher than a certain value depending on the type of fastening. Curve B is a sliding plate test piece made of a copper-based sintered alloy having a width of 22 mm and a thickness of 10 mm, a width of 22 mm, and a thickness of 2 mm.
The 5052 aluminum alloy boat test piece of
It shows changes in compressive force and resistance when pressure is applied by an Amsler tester in the range of mm. In this case as well, as in the case of bolt fastening, the resistance decrease saturates above a certain pressure. The curve A shows the tightening torque and resistance change when tightened with an actual bolt. Saturation occurs where the resistance value is higher than in the case where a pressure test is performed without using a bolt. Indicates that there is still room for improvement.

[0006] This is caused by the fact that the current collector boat made of an aluminum alloy material is thin due to the fastening of the bolts, and therefore it warps back and slides on the sliding plate 4.
It is thought that this is due to the formation of a gap between and. That is, when pressure is applied by actually tightening the nut of the bolt, the applied pressure is locally concentrated, causing a slight plastic deformation of the current collector boat, and a gap tends to be formed near the bolt fastening part rather than at a place farther from this. It is in. The generation of this gap is actually caused by interposing a so-called compound 9 which is a petroleum-based grease, a viscous synthetic organic polymer compound, or zinc powder, carbon powder or the like added thereto between the joint surfaces. Although it prevents it, it facilitates the entry of rainwater, and as a result, the electrical characteristics of the bolted portion are exponentially degraded by the synergistic effect of growth of the oxide film, increase in resistance, and temperature increase due to increase in resistance.

Therefore, as a method for solving such a problem, basically, the plate thickness of the collector boat is increased to increase the rigidity and prevent plastic deformation due to bolt fastening.
By the way, if the thickness is about 5 mm, plastic deformation can be prevented, but weight reduction is one of the re-important issues of the pantograph, and simply increasing the plate thickness of the collector boat increases the mass of the pantograph. Is not preferable.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to suppress an increase in weight to a minimum and prevent the occurrence of plastic deformation due to bolt fastening. It is an object of the present invention to provide an aluminum alloy material for supporting a sliding plate, which has an electrical characteristic of a bolt fastening portion, particularly an increase in resistance, reduced.

[0009]

In order to achieve the above object, a first invention uses an aluminum alloy extruded material having a substantially U-shaped cross section as an aluminum alloy material for supporting a sliding plate,
The sliding plate mounting portion to which the sliding plate for collecting electricity is joined and fastened is fixed, or the sliding plate mounting portion and both ends form a thick portion. 2nd invention is the aluminum alloy material for sliding plate support in 1st invention, Mg; 0.6-1.2%, S
i; 0.4 to 1.3%, Cu; 0.05 to 0.4% included, and Cr; 0.05 to 0.15%, Mn; 0.05
.About.0.5%, Zr; 0.05 to 0.15% of one or more metals.

[0010]

When the current collecting slide plate is bolted, the thick portion prevents the aluminum alloy material for supporting the slide plate from being plastically deformed and warped. For this purpose, an extruded die material obtained by selecting an alloy and extruding technique rather than partially processing an aluminum alloy sheet material is suitable. In order to improve the rigidity, it is necessary to improve the yield strength of the aluminum alloy material for supporting the sliding plate, but it is generally difficult to perform thin-walled precision extrusion processing such as with an aluminum alloy current collector having high yield strength. 6-1.2%, Si; 0.4-1.3
%, Cu; 0.05 to 0.4%, and Cr;
05-0.15%, Mn; 0.05-0.5%, Zr;
By using an aluminum alloy containing 0.05 to 0.15% of one or more metals, thin-walled precision extrusion molding is possible.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 is a sectional view showing an embodiment of a current collecting boat made of an aluminum alloy material for supporting a sliding plate according to the present invention. In the figure, the same components as those in FIGS. 2 to 4 are designated by the same reference numerals. In the figure, the current collecting boat 1 is formed of an aluminum alloy extruded material in a U-shaped cross section, and a sliding plate mounting portion 10 and both end portions 11 to which a sliding plate 4 for collecting current is joined and fastened and fixed by bolts 8 are long. The thick portions are formed over the entire length in the direction. The thick portions of the sliding plate mounting portion 10 and the both end portions 11 are effective only by the sliding plate mounting portion, but if both of these portions have thick portions, the effect is further improved. In this case, the present embodiment shows an example in which two sliding plates 4 are arranged in parallel on the upper surface of the current collecting boat 1, and therefore, the sliding plate mounting portions 10 are formed thick on both ends of the upper surface of the current collecting boat 1. Has been done. Then, the plate thickness D ₁ of the sliding plate mounting portion 10 and both end portions 11 forming these thick portions is
D ₁ = about 2.5 mm, the plate thickness D ₂ of the other plates is
D ₂ = about 1.7 mm.

Next, additional elements will be described. Mg is necessary for strength together with Si, and the lower limit value is 0.6%.
In the following, desired strength cannot be obtained, and in the case where the upper limit value is 1.2% or more, extrusion processability is rather deteriorated, and precision thin-wall processing becomes difficult. Further, if the strength is too high, the conformability at the time of bolt fastening is impaired. Si, together with Mg, is necessary for imparting strength. When the lower limit value is 0.4% or less, the age hardening property is poor, and a predetermined strength cannot be obtained. The condition deteriorates. Cu is necessary for imparting strength, and when the lower limit value is 0.05% or less, no effect is obtained, and when the upper limit value is 0.4% or more, extrudability is impaired and corrosion resistance is deteriorated. Cr, Mn, and Zr are necessary for the extruded material to have a fine recrystallized structure, or to form a structure called a fiber structure that is preferable for strength, corrosion resistance, toughness, etc., and is 0.05% or more of each element. A significant effect is produced, and if Cr and Zn are 0.15% or more and Mn is 0.5% or more, a huge crystallized substance is apt to occur during casting, and ductility and toughness are deteriorated. In particular, Cr deteriorates extrusion and bending workability. When the composition of each of these elements is within the above range, even the most economical T5 material has a composition of 30 to 35 kg.
A proof stress of / mm ² is obtained, and it is excellent in precision high-speed extrusion processability of thin-wall materials and molding processability after extrusion process. In the present invention, all percentages of element contents are% by weight.

Here, in the present invention, Mg; 1.0
%, Si; 1.0%, Cu; 0.2%, Cr; 0.07
%, Mn; 0.3%, and other ordinary impurities are cast by a semi-continuous casting method, homogenized for 4 hours at 550 ° C., and then the cross-sectional shape shown in FIG. The extruded mold material was extruded. Then, a 2.5 mm thick portion was cut out from this extruded mold material to form a current collecting boat, and a copper-based sliding plate having a width of 25 mm and a thickness of 10 mm was fastened thereto with 8 mm bolts, and a 2 mm thick A5052 half. Similarly, electrical characteristics were measured when a copper-based sliding plate having a width of 25 mm and a thickness of 10 mm was fastened to a hard material with 8 mm bolts. Table 1 shows the results.

[0014]

[Table 1]

As is clear from the results shown in Table 1,
The aluminum alloy material for supporting a sliding plate according to the present invention was able to improve the yield strength, conductivity, electric resistance, and temperature characteristics during energization, as compared with the A5052 semi-hard material having a constant plate thickness. This is because when the sliding plate mounting portion and both ends of the current collecting boat form a thick wall portion, the plastic deformation of the current collecting boat due to the stress at the time of bolt fastening is less than that of the current collecting boat with a uniform plate thickness. This is because it is difficult to form a gap with the sliding plate. It should be noted that if the thick portion is not provided at the end of the collector boat, plastic deformation will occur, which is not preferable.

[0016]

As described above, according to the aluminum alloy material for supporting the sliding plate according to the present invention, since the sliding plate mounting portion or the thick portions at both ends of the sliding plate mounting portion are provided, it is possible to use the bolt fastening. It is suitable as a support material for a current collector slide plate which is attached to a pantograph for railway vehicles, because it has little plastic deformation and can obtain stable electrical characteristics. In addition, sufficient rigidity can be obtained even if the sliding plate mounting portion and both ends are thinned,
Its effect is great, such as enabling precision high-speed extrusion.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a collector boat made of an aluminum alloy material for supporting a sliding plate according to the present invention.

FIG. 2 is a plan view showing a conventional example of a current collecting boat.

FIG. 3 is a front view of the current collecting boat.

FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG.

FIG. 5 is a diagram showing changes in fastening torque and electric resistance.

[Explanation of symbols]

 1 Current collecting boat 2 Overhead wire 4 Current collecting sliding plate 8 Bolt 9 Compound 10 Sliding plate mounting part 11 End part

Front Page Continuation (72) Inventor Koichi Yoshida 1-34-1 Kambara, Kambara-cho, Anbara-gun, Shizuoka Technos Nigaru Co., Ltd. (72) Inventor Takuo Kusano 3-13-12 Mita, Minato-ku, Tokyo Nihonkaru Within Kinka Co., Ltd.

Claims (2)

[Claims] 1. A sliding plate mounting portion or a sliding plate mounting portion to which a current collecting sliding plate is joined and fastened and which is formed of an aluminum alloy extruded material having a substantially U-shaped cross section, and a thick portion is formed at both ends. Aluminum alloy material for supporting sliding plates, which is characterized by 2. The aluminum alloy material for supporting a sliding plate according to claim 1, wherein Mg; 0.6 to 1.2%, Si;
4 to 1.3%, Cu; 0.05 to 0.4% included, and Cr; 0.05 to 0.15%, Mn; 0.05 to 0.5
%, Zr; 0.05 to 0.15% of one kind or two or more kinds of aluminum alloy materials for supporting sliding plates.