一、绪言随着机车车辆的高速化和行车密度显著增长的形势,以及考虑到产生大的机车车辆事故的原因之一是车轴折损,日本国有铁道把防止车轴折损放在最主要的位置上。首先是加强车轴探伤以便及早暴露产生裂纹的车轴,采用高频淬火提高车轴强度,改善车轴的管理,以作为车轴安全措施。 I. INTRODUCTION As the speeding up of locomotives and the increase of driving density and the fact that one of the causes of large locomotive and rolling stock accidents are axle breakage, the Japanese state-owned railway has placed the axle break prevention at the top of the list on. The first is to strengthen the axle inspection in order to expose the cracked axle as early as possible, using high-frequency quenching to improve the axle strength and improve the axle management as an axle safety measure.