大国工匠 | 0.005毫米，他在微米级挑战中锻造高铁零件

Core Viewpoint - The article highlights the advancements in China's high-speed rail technology, focusing on the CR450 train's braking system and the innovative contributions of technician Zhang Hongbin in achieving high precision in manufacturing key components [1][3][5]. Group 1: Technological Innovations - The CR450 train must achieve a braking distance of 6500 meters and a time of 112 seconds when decelerating from 400 km/h to 0 [3]. - Zhang Hongbin has developed the brake disc hub, a critical component of the braking system, emphasizing the importance of effective braking in rail transport [3][5]. - The precision required for the brake disc hub is 0.005 mm, which is one-sixteenth the thickness of a human hair [7]. Group 2: Manufacturing Process - Traditional methods would require high-precision grinding machines, which could slow down the production process; Zhang proposed using lathe techniques instead [5][9]. - After experimenting with seven different tool structures and nine cutting paths, the team improved the efficiency of producing the brake disc hub, doubling the speed compared to foreign grinding methods [9]. - The introduction of new materials posed challenges, leading to innovations in tool optimization and the development of a new numerical control technology for the wedge pin used in the braking system [11][13]. Group 3: Personal and National Pride - Zhang expressed pride in having his manufactured parts installed in the "Fuxing" train, contributing to the broader goal of building a strong transportation infrastructure in China [15].