Sintered friction material for high-speed railway vehicle and manufacturing method thereof
A technology for high-speed railways and friction materials, which is applied to friction linings, transportation and packaging, mechanical equipment, etc., and can solve the problems of difficulty in ensuring wear resistance, difficulty in high-speed railway vehicles, friction coefficient and wear resistance of sintered friction materials. and other problems, to achieve the effect of great industrial significance
Active Publication Date: 2021-01-01
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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Embodiment
[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. The mixed powder was put into a molding die, and press-molded at 300 MPa for 3 seconds at normal temperature to obtain a preform. Next, this preform was superimposed on a copper-plated metal plate (pressure plate), 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, install it on the moment bearing plate with rivets, get figure 1 Brak...
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Abstract
An object of the present invention is to provide a sintered friction material for high-speed railway vehicles capable of stably maintaining a high friction coefficient even in a high-speed range exceeding 300 km / h. The sintered friction material for high-speed railway vehicles of the present invention uses Cu as a base material, and contains 1-20 vol% of FeCr, 5-20 vol% of metal oxide, and 30-60 vol% of lubricant.
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] High-speed rail vehicles such as the Shinkansen have a weight of more than 40t per vehicle and run at a travel speed of more than 300km / h. Therefore, a brake capable of reliably stopping such a high-speed vehicle is essential. In particular, it is desirable to have a brake that can stop safely and at a short distance in an emergency. [0003] Conventionally, brakes for high-speed railway vehicles have been generally used in combination: electric brakes that apply braking by using a motor as a generator; base brakes (disc type brakes) that apply braking by pressing a friction material against a brake rotor that rotates with the axle. brake). Among them, the friction material constituting the disc brake is usually manufactured by adding a friction adjusting material, a p...
Claims
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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