JP2853564B2 - Pantograph ground plate made of lead impregnated Fe-based sintered alloy with excellent wear resistance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current collecting pantograph made of a lead-impregnated Fe-based sintered alloy which exhibits excellent abrasion resistance with low opponent aggressiveness, particularly when used in an electric vehicle running at high speed. It relates to a ground plate material.

[0002]

2. Description of the Related Art Conventionally, as described in, for example, Japanese Patent Application Laid-Open No. 62-50445, as a pantograph plaque for current collection, in terms of% by weight (% relating to the composition indicates% by weight), Mo: 0. 1 to 8%, Fe-Mo alloy: 1 to 15
%, And if necessary, Cr: 1 to 15
% As a dispersed phase forming component, and further as a base forming component, Cu: 0.1 to 5%, N
i: 0.1 to 5%, C: 0.02 to 0.5%, and the remainder is also composed of Fe and inevitable impurities as a base forming component, and a porosity of 5 to 30%. Many other lead-impregnated Fe-based sintered alloys have been proposed, including a lead-impregnated Fe-based sintered alloy in which Pb or a Pb alloy is impregnated into a Fe-based sintered alloy having the following characteristics.

[0003]

On the other hand, the speeding up of electric vehicles in recent years has been remarkable, and with this, pantograph sliding plate materials are required to have more wear resistance. In a sintered alloy current collector pantograph slide plate material, for example, when the speed of an electric vehicle exceeds 250 km / hr, abrasion progresses rapidly, and not only is the service life shortened in a relatively short time, but also the mating material. At present, the damage to the trolley wire also increases.

[0004]

Means for Solving the Problems Accordingly, the present inventors have
From the above viewpoints, we conducted research to develop a pantograph slide plate material that demonstrates excellent wear resistance with low opponent aggression even at high speed running of electric vehicles, and as a result, the pantograph slide plate material for current collection was dispersed. Hard Mo as a phase forming component
One or two of the intermetallic compounds of Fe and Mo and the intermetallic compounds of Fe, Mo, Si, and Cr: 5 to 30%, each containing C: 0.02 to
0.5%, Cr: 0.1-5%, Mo: 0.1-
3%, Mn: 0.2 to 2%, the balance being Fe-based sintered alloy having a composition comprising Fe as a base forming component and unavoidable impurities, and a porosity of 5 to 15%. Lead impregnated Fe impregnated with Pb or Pb alloy
When composed of a base-based sintered alloy, the resulting lead-impregnated pantograph slide plate made of a lead-impregnated Fe-based sintered alloy has a counterpart even at high speeds due to the action of the hard intermetallic compound constituting the Fe-based sintered alloy. Without damaging the trolley wire
The research results show that the steel exhibits excellent wear resistance.

[0005] Accordingly, the present invention has been made based on the above-mentioned research results, and it has been found that hard Mo-Si intermetallic compounds and Fe-Mo
One or two of —Si—Cr—intermetallic compounds:
5 to 30%, both of which are as base forming components,
C: 0.02 to 0.5%, Cr: 0.1 to 5%, M
o: Fe containing 0.1 to 3%, Mn: 0.2 to 2%, the balance being composed of Fe and inevitable impurities as a base forming component, and having a porosity of 5 to 15%. The present invention is characterized by a current collector pantograph slide plate made of a lead impregnated Fe-based sintered alloy obtained by impregnating a base sintered alloy with Pb or a Pb alloy.

Next, the reason why the component composition and the porosity of the Fe-based sintered alloy constituting the pantograph ground plate of the present invention are limited as described above will be described.

A. Component composition (a) Intermetallic compound These components have a Beakers hardness (Hv) of 800 to
It has a high hardness of 1200, and on the surface immediately below the sliding surface of the sliding plate material, suppresses plastic deformation of the base material due to sliding,
In the state of being exposed on the sliding surface of the slide plate material, the crystal form of this is hexagonal, whereas the crystal form of the copper material forming the trolley wire, which is the mating material, is cubic. Low agglutination and abrasive (abrasiveness), combined with the formation of a lubricating oxide film during practical use, the wear resistance of the sliding plate material under low aggressiveness, especially at high speeds However, if the content is less than 5%, the desired effect cannot be obtained, whereas if the content exceeds 30%, the strength is reduced. The amount was defined as 5-30%.

(B) C The C component has the effect of forming a solid solution in the base material and strengthening it, but if its content is less than 0.02%, the desired effect cannot be obtained. If the content exceeds 0.5%, the hardness rapidly increases and the opponent's aggressiveness increases. Therefore, the content is set to 0.02 to 0.5%.

(C) Cr The Cr component has the effect of forming a solid solution in the base material to improve the heat resistance of the base material and thereby preventing the base material from being deformed by sliding heat generated during practical use. Is less than 0.1%, a desired effect cannot be obtained in the above-mentioned action. On the other hand, if the content exceeds 5%, the opponent aggressiveness rapidly increases. It was determined to be 5%.

(D) Mo The Mo component has the effect of forming a solid solution in the substrate to improve its strength, but if its content is less than 0.1%, the desired effect cannot be obtained. On the other hand, if the content exceeds 3%, the toughness decreases, so the content is set to 0.1 to 3%.

(E) Mn The Mn component forms a solid solution in the base material, softens it, improves conformability in the early stage of practical use, and works hardens the base material as practical use progresses. However, if the content is less than 0.2%, the desired effect cannot be obtained, and if the content exceeds 2%, the initial wear becomes remarkable. To 0.
It was determined to be 2 to 2%.

B. If the porosity is less than 5%, the proportion of Pb or the Pb alloy impregnated in the Fe-based sintered alloy is too small, so that the excellent lubricity provided by the Pb and the Pb alloy cannot be secured, On the other hand, if the ratio exceeds 15%,
The strength of the Fe-based sintered alloy, that is, not only the strength of the ground plate material, but also the arc resistance is reduced, and the wear progresses rapidly. I decided.

[0013]

EXAMPLES Next, the pantograph ground plate of the present invention will be specifically described with reference to examples. As the raw material powder, atomized iron powder having a particle size of -80 mesh, Mo-Si intermetallic compound (containing 20% of Si) and -30 mesh, and Fe-Mo-Si-Cr intermetallic compound (Mo: 40)
%, Si: 10%, Cr: 2.5%) atomized powder, -30 mesh electrolytic Cr powder, average particle size: 3
μm reduced Mo powder, 60 μm Fe-Mn alloy (M
n: 60%) powder and a graphite powder having a particle size of -325 mesh were prepared, and these raw material powders were blended into the blending composition shown in Tables 1 and 2 and mixed.
Press molding into a green compact at a predetermined pressure within the range of Pa,
By sintering at a predetermined temperature within a range of 1200 ° C. for one hour, an Fe-based sintered alloy having substantially the same composition as the composition and the porosity shown in Tables 1 and 2 is manufactured. Then, these Fe-based sintered alloys are impregnated with pure lead or a Pb alloy having a composition of Pb-30% Sn as shown in Tables 1 and 2, thereby obtaining a width: 25 mm × length: 80 mm.
X Thickness: Pantograph slabs for current collection (hereinafter referred to as slabs of the present invention) 1 to 18 made of a lead-impregnated Fe-based sintered alloy of the present invention having a dimension of 10 mm were manufactured respectively.

For the purpose of comparison, in addition to the above-mentioned raw material powder, as raw material powder, Fe-particle having a particle size of -30 mesh was used.
Mo alloy (Mo: 60% content) powder, average particle size: 1.5
μm carbonyl Ni powder and 100 μm Cu
Using the powders, these raw material powders are combined with the above-mentioned JP-A-62-5
No. 0445, the composition corresponding to the Fe-based sintered alloy constituting the pantograph ground plate, that is, F
e-Mo alloy: 7%, Cr: 7%, Mo: 3%, Ni:
3%, Cu: 3%, C: 0.1%, Fe: The same conditions as in the conventional lead impregnated F
A pantograph ground plate for current collection made of an e-based sintered alloy (hereinafter referred to as a conventional ground plate) was manufactured.

[0015] Accelerated wear tests were performed on the various slabs obtained as a result. In the accelerated wear test, a simulated trolley wire was used to simulate a trolley wire on the side opposite to the fixed side of a disk having an outer diameter of 2.2 m supported upright by fixing the center to the horizontal rotation axis of the motor. : 5mm x thickness: 15mm hard copper ring (JIS C1100 BB-H) 50mm
Using an eccentrically mounted device, the rubbed plate is pressed with a pressing force of 70N on both sides on the diameter line of the hard copper ring, and the length is:
A surface of 80 mm × width: 25 mm is brought into surface contact, and while a current of 100 A flows between the simulated trolley wire and the sliding plate, the rotation of the disk is increased to a rotation speed of 250 km / hr in 5.5 minutes. After maintaining at the speed for 5.5 minutes, the stop is made as one cycle over 5.5 minutes, and this is repeated three times, thereby performing the specific wear amount of the slide plate material and the wear depth of the simulated trolley wire as the counterpart material. Was measured. Table 1 shows the measurement results.
2 is shown.

[0016]

[Table 1]

[0017]

[Table 2]

[0018]

From the results shown in Tables 1 and 2, all of the abraded plates 1 to 18 of the present invention showed a lower aggressiveness than the conventional abraded plate, and had better wear resistance. It is clear that As described above, the pantograph sliding plate material of the present invention exhibits excellent wear resistance with low opponent aggressiveness even when used not only in normal running but also in a high-speed running electric car, and has a long service life. The service life can be further extended.

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kunio Fukuhara 2-8-8 Hikaricho, Kokubunji-shi, Tokyo 38 Inside the Railway Technical Research Institute (72) Inventor Junhisa Aoki 2-8 Hikaricho, Kokubunji-shi, Tokyo 38 Inside the Railway Technical Research Institute (56) References JP-A-58-27961 (JP, A) JP-A-5-230603 (JP, A) JP-A-58-84945 (JP, A) 44-22725 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) C22C 38/00 304 B22F 3/26 B60L 5/00 C22C 38/22 C22C 38/60

Claims (1)

(57) [Claims] (1) in weight%, one or two of hard intermetallic compounds of Mo and Si and intermetallic compounds of Fe, Mo, Si and Cr: 5 to 30% as a dispersed phase forming component; And C: 0.02 to 0.5%, Cr: 0.1 to 5%, Mo: 0.1 to 3%, and Mn: 0.2 to 2%. Fe-based sintered alloy containing Fe and a unavoidable impurity as a base forming component and having a porosity of 5 to 15%
Or a lead-impregnated F having excellent wear resistance, characterized by being made of a lead-impregnated Fe-based sintered alloy impregnated with a Pb alloy.
Pantograph ground plate for current collection made of e-based sintered alloy.