Sintered friction material for high speed railway vehicles and method for manufacturing same
A high-speed railway, friction material technology, applied in friction linings, mechanical equipment, transportation and packaging, etc., can solve problems such as difficulty in ensuring wear resistance, friction coefficient of sintered friction materials, wear resistance problems, and hindrance to sintering of iron components , to achieve the effect of great industrial significance
Active Publication Date: 2018-01-19
AKEBONO BRAKE IND CO LTD
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Problems solved by technology
[0006] However, the sintered friction materials described in these documents have problems in terms of friction coefficient and wear resistance in the high-speed range.
Specifically, the sintered friction material described in Japanese Patent Application Laid-Open No. 2006-16680 uses electrolytic iron powder and stainless steel powder in combination to prevent sintering of the iron component, thereby generating voids in the friction material, and utilizing the effect of the voids. Grinding is used to secure the coefficient of friction, so it cannot cope with the further increase in speed of high-speed railway vehicles (above 350km / h)
On the other hand, the technology described in Japanese Patent Laid-Open No. 2007-126738 has the problem of using an iron-based alloy as a base material. Compared with a copper-based sintered friction material, the thermal conductivity is poor, and the deceleration is accompanied by a sharp temperature rise
In addition, there is a problem that due to the relationship with the counterpart material (brake rotor), the amount of wear during deceleration is large, and it is difficult to ensure sufficient wear resistance.
Therefore, in the technology described in this document, it is extremely difficult to cope with the further increase in speed of high-speed railway vehicles similarly to the technology described in the above-mentioned Japanese Patent Laid-Open No. 2006-16680.
Method used
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[0099] Hereinafter, the present invention will be specifically described using Examples and Comparative Examples.
[0100] [Sintered friction material]
[0101] The elements shown in Table 1 were prepared as raw material powders, and these raw material powders were mixed as shown in Table 2 to obtain mixed powders. This mixed powder was put into a molding die, and pressurized at 300 MPa for 3 seconds at room temperature to obtain a preform. Next, this preform was stacked on a copper-plated metal plate (pressure plate), and then placed in a sintering furnace and fired at 800° C. to 1,000° C. and 1 MPa for 60 minutes to obtain a sintered body. The sintered body was cooled to room temperature, and after sizing at room temperature and 70 MPa for 3 seconds, the surface of the sintered body was polished to obtain a sintered friction material with a thickness of 20 mm and an outer shape of 60 mm. After that, mount the moment bearing plate with rivets to obtain figure 1 Brake pad 1...
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Abstract
The purpose of the present invention is to provide a sintered friction material for high speed railway vehicles, which is capable of stably maintaining high friction coefficient even in a high-speed range exceeding 300 km / h. The sintered friction material for high speed railway vehicles according to the present invention contains Cu as a base material, FeCr by 1-20 vol%, a metal oxide by 5-20 vol%, and a lubricant by 30-60 vol%.
Description
technical field [0001] The present invention relates to a sintered friction material used in high-speed railway vehicles such as Shinkansen and a method for producing the same. Background technique [0002] The weight of each high-speed railway vehicle such as the Shinkansen exceeds 40 tons, and it operates at a travel speed exceeding 300 km / h. Therefore, a brake capable of reliably stopping such a high-speed vehicle is essential. In particular, a brake that can stop safely and in a short distance in an emergency is desired. [0003] In the past, as brakes for high-speed railway vehicles, generally speaking, an electric brake that uses a motor as a generator to apply brakes; brake). Among them, the friction material constituting the disc brake is usually manufactured by adding friction adjustment materials, polishing materials, lubricants, etc. to base materials such as copper and iron. [0004] For example, Japanese Patent Application Laid-Open No. 2006-16680 discloses ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C22C32/00B22F3/24B22F5/00B22F7/08C22C1/05C22C9/00F16D69/02B22F1/10
CPCB22F5/00B22F7/08C22C1/05C22C9/00F16D69/02B22F3/02B22F3/10B22F7/062C22C1/0425C22C32/001C22C32/0021B22F2998/10B22F2999/00B22F1/10
Inventor 大薮耕嗣
Owner AKEBONO BRAKE IND CO LTD