JPS5869402A - Slider for third rail type electric car - Google Patents

Abstract

PURPOSE:To improve the wear resistance of a slider by constructing to melt and impregnate copper of copper-base alloy in a hole of an iron-base sintered alloy. CONSTITUTION:The porous sintered material of a high carbon content copper steel is used as a basic alloy phase, copper or copper alloy is molten and impregnated in the hole of the alloy and is dispersed as the second phase in the base alloy. High hardness and strong toughness of the prescribed characteristics are provided with the base alloy, and copper or copper alloy is used in the second phase, thereby preventing the increase in the wear resistance and increasing the toughness as well as improving the wear resistance by the general operation of the increase in the conductivity necessary for an energizing material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a current collecting slide plate for an electric train that collects current from the third rail. Conventionally, current has been collected on general trains by contacting a pantograph C (attached slide plate) to a hard copper power feeder. Mechanism and pantograph spring mechanism C: more relaxed. As for the material of the scraping board, sintered alloys such as rust, iron, and iron are often used.

A rail system is used, in other words, a rail made of # is installed on the outside of the running rail, and the current is collected by sliding two sliders on the chassis.However, in this method, Since the shock mitigation performance is inferior to the former, ** increases,
The arc 12 generated at this time significantly increases the wear of the slider plate and the rail.

In order to prevent this wear, a method is used to prevent separation by increasing the contact pressure between the slider and the rail. As described above, the third rail slider differs from the contact line type slider in the following points in terms of usage conditions. Specifically, there are six points: the current-collecting partner material is not copper but steel, the contact pressure is high, and a large impact force is applied due to the so-called rigid overhead wire.

The material currently mainly used for this type of slider plate is spheroidal graphite cast iron, and the copper-based and iron-based sintered alloy materials widely used in catenary systems are not used.

The main causes of wear on the slider plates in this method are wire wear due to the high contact pressure unlike the overhead wire method.Also, since the slider slides in a dry state, there is no adhesion and friction. Therefore, the rails of the mating member (11
We have attempted to improve the material for slipping due to its low adhesive wear (with respect to Il material) and the above-mentioned mechanical strength. Regarding adhesive wear, the specific wear amount is opposite to the indentation hardness of the material. It is widely known that the wear constant is proportional to the wear constant determined by both materials. What is the lifespan of the sliding plate? In order to increase the hardness, it is necessary to increase the hardness and lower the wear constant. In order to increase the hardness, it is more advantageous to use an iron-based alloy for C2 than a copper thread alloy, but on the other hand, non-lubricated sliding between materials of the same type as the mating material. This results in a significant increase in the wear constant.

In the present invention, a porous sintered body of high carbon copper-containing steel is formed into a base metal phase, and the pores are filled with at: or copper alloy? Infiltrate #! The two phases are dispersed in the base alloy phase, and the base alloy phase provides the required properties of high hardness and toughness, and the second phase is made of copper or a four-steel alloy (= Therefore, the above-mentioned increase in the wear constant is prevented, the toughness is increased, and the electrical conductivity necessary for the current-carrying material is increased.
: Improved wear resistance.

In order to examine the abrasion resistance of wood, the following test was conducted. First, natural graphite powder α8% with a particle size of 100 mesh or less,
Blend 15% electrolytic copper powder with residual atomized iron powder, add and mix 05% zinc stearate, mold with pressure V*, and form this? High carbon gold steel sintered SVs with different densities were obtained by sintering in a reducing atmosphere at a temperature of 1150°C for 30 minutes, and the pores were filled with Cu-3%C, which is widely used as an infiltration material.
.

The alloy was immersed in Iw with adjustment so that the density after infiltration was 7.797 cd.

Measurement of the hardness of the sample produced in this way @I! 1
Shown in the figure. This graph shows that as the density of the sintered body increases, that is, as the amount of iron increases, the hardness increases monotonically.

Next, the present invention material 1 having the composition shown in 1 in the figure, the currently used casting ##2 for comparison, and the currently used cocoon thread sintered material 3 using the catenary method for reference. An energized sliding test was conducted on Type 4 C of the iron I sintered material 4, and the wear amount of each sample was measured. Table 1 shows the composition and C: physical properties of each sample.

The test method in Table 1 is to simulate the third rail by pasting a 20M wide rustproof (SUS504) on the edge of a 3.5mm diameter disc made of corrosion-resistant aluminum alloy, and using this and a contact plate! The slides were made to slide under the following conditions C while being brought into contact and energized, and the relationship between the sliding distance and the wear amount of the slide plate was determined.

According to the test result @ 57 in Figure 2, the present invention I: the sintered material 1 is superior to the currently used cast iron material 2, and C: even if the same sintered alloy is used, it is different from the present invention. The sintered materials 3 and 4 for the overhead line system having different configurations are shown to have poor performance C: inferior. This means that even similar alloys may exhibit completely different physical properties depending on the conditions of use.

Next, the reason for limiting the composition range of the material of the present invention will be explained.

As a result of preliminary tests, it was found that the amount of nima grain decreased as the hardness increased in this type of sliding board material. and,
Part 1: Hardness increases with the amount of iron in the composition, so the lower limit for the amount of iron in the composition of the present invention material is set at 80%, where there is a clear difference in wear amount from the current material. The upper limit was set at 90%, which is the limit value where the amount of the second #l becomes too small and causes the wear constant to increase rapidly.

The structure of the material of the present invention is a nonporous copper-containing carbon steel in which copper alloy #i, which is the second phase, is dispersed, and the carbon in the composition is present in the copper-containing carbon steel, which is the base alloy phase. Therefore, the mechanical properties of this material are greatly influenced by the carbon content. The lower limit of the amount of carbon was set at 0.3%, which is the limit at which the hardness decreases significantly, and the upper limit was set at 10% in view of the decrease in impact resistance due to embrittlement of the material.

The material of the present invention is infiltrated with fii or copper alloy, but the purpose of this is not only to generate a second phase that reduces the wear constant, but also to eliminate the inherent pores. Since the purpose of filling is to improve mechanical properties, excellent wear resistance cannot be obtained if the entire required amount is added as a powder and sintered.

If a portion is added as copper powder to the raw material powder, infiltration becomes easier.
：Naru etc@@ Although favorable results can be obtained, the amount of infiltration must be 70% or more of the amount of copper or copper alloy or 11! ! The copper alloy for use is not limited to the above-mentioned Cu-Go alloy f2, but even if it is a copper alloy or copper that can be infiltrated with Cu-Zn thread, the wear resistance of the wood will not be impaired.

[Brief explanation of drawings]

Figure 1 is iron! ! I is a graph showing the relationship between the sintered density of 1% sintered material and the hardness after copper infiltration, and 2nd m is a T graph showing a comparison of the wear resistance of various contact plate materials. 11 Invention material 6 Copper-based sintered material (for overhead wire system) 2
...Current cast iron 4...Iron-based sintered materials (same as above) Agent Kunihiko Masubuchi

Claims (1)

[Claims] 1. Inside the pores of iron-based sintered alloy (: a structure in which copper or copper-based alloy is infiltrated, and the overall composition is carbon 0 by weight ratio)
．． 3 to 1% iron, 80 to 90% iron, and the remainder copper or copper-based alloy, with less than 30% of the solid copper or copper-based alloy being present in the iron-based sintered alloy, and the remainder being infiltrated. A slide plate for a third-rail train that exists in the pores of the material wfft*.