农业机械,其突出的特点是工作环境恶劣、冲击力大,因此在设计研制农机产品时对农机零部件的抗疲劳、抗冲击强度及硬度等机械性能有较高的要求,如柴油机的曲轴、凸轮轴、齿轮等零件在加工过程中都必须经过热处理工艺,才能达到一定的机械性能。但在热处理生产中,由于操作不当,常 Agricultural machinery, its outstanding feature is the harsh working environment, great impact, so in the design and development of agricultural machinery parts on the agricultural machinery parts fatigue resistance, impact strength and hardness and other mechanical properties have higher requirements, such as the diesel engine crankshaft, Camshafts, gears and other parts in the processing must be heat treatment process, in order to achieve a certain degree of mechanical properties. But in the heat treatment production, due to improper operation, often