Development of brake discs for high-speed trains using laser cladding.

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last updated：Jul 14, 2022

大阪富士工業

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Successful development of next-generation high-speed train vehicle brake discs using lasers!!

Using laser cladding technology, we conducted surface modification with newly developed materials, resulting in the successful development of foundational technology for brake discs aimed at next-generation high-speed railway vehicles that meet target performance. [Background of Research and Development] Considering the increasing thermal load associated with the further acceleration of railway vehicles, the application of existing steel brake discs is approaching its limits. There is a need to further enhance reliability against thermal loads, which has led to the exploration of methods to form a heat-resistant layer on the friction surface of brake discs. This research and development aims to develop brake discs for next-generation high-speed railway vehicles using laser cladding. This project has been adopted as part of the "FY 2014 Strategic Basic Technology Advancement Support Project." [Research Implementing Institutions] - Railway Technical Research Institute - Nippon Steel & Sumitomo Metal Corporation (now Nippon Steel Corporation) - Osaka University, National University Corporation - Osaka Fuji Industrial Co., Ltd.

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【Functional Surface Modification Technology】 When braking from a speed of 400 km/h, the friction surface is heated to approximately 1000°C. As a result, there are concerns about thermal cracking, thermal deformation, and a decrease in braking performance with the currently used steel discs. Therefore, we have worked on surface modification using high-performance materials that possess heat resistance and wear resistance, even under the harsh conditions of repeated braking from high speeds. By using laser cladding, which allows for controlled penetration compared to conventional arc welding, we developed a new material (patent pending) and achieved an overall improvement in the functionality of the brake disc. 【Full-scale (wheel diameter 860 mm) bench test】 ◆ The braking distance generally met the expected values. ◆ The friction coefficient showed values around the expected range and remained stable, independent of the initial braking speed. ◆ The appearance of the disc after durability testing showed no cracks or rough damage and was in good condition. The appearance of the lining showed similar results. ◆ The wear amount of the disc was about one-third of that of the currently used steel discs, demonstrating superior performance compared to conventional products.