论文部分内容阅读
前言机车车轴不但要承受重载,而且在运行过程中还要经受强大的反复冲击的负荷故在制造过程中对其有较高的技术要求,尤其是抗张强度与冲击韧性均较车辆车轴及一般之40号钢要求为高,这样在热加工的工艺方面,特别是在锻造后的热处理工艺更是决定车轴质量之关键。我厂在开始制造机车车轴时,由于沿用一般之正火处理工艺,在加热后出炉时放置于静止空气中冷却,这样冷却的速度很慢,其机械性能不能达到技术条件之要求,合格率仅达40%左右。当时严重威胁着工厂之生产
Foreword locomotive axles not only have to withstand heavy loads, but also in the operation of the process but also to withstand the impact of a strong repeated impact in the manufacturing process to its higher technical requirements, especially the tensile strength and impact toughness than the vehicle axle and General 40 steel requirements for the high, so that the heat processing technology, especially in the forging after the heat treatment process is the key to determine the axle quality. I started making locomotive axles, due to the use of the general normalizing process, baked after heating placed in still air cooling, so the cooling rate is very slow, and its mechanical properties can not meet the technical requirements of the pass rate of only Up to 40%. At that time a serious threat to the factory’s production