一、了解原始资料了介原始资料包括;零件的名称,在机器中的部位和作用;使用寿命;服役条件(如载荷类型、工作频率、周围环境、温度、压力,速度等);材料(如钢号、硬度等);加工工艺(如铸,锻,焊、机加工等》;热处理和表面强化工艺(包括各种化学热处理、表面热处理、滚压,喷丸等);使用维护情况等。二、外观检查观察零件的几何形状、有无键槽,油孔、尖角,螺纹、截面突然过渡等应力集中情况。观察整个零件的变形情况,看有否弯曲,颈缩等。观察零件表面的冷热加工质量,看有无折 First, to understand the original material The original material includes: the name of the part, the role and position in the machine; service life; service conditions (such as load type, operating frequency, ambient environment, temperature, pressure, speed, etc.) Steel, hardness, etc.); processing technology (such as casting, forging, welding, machining, etc.); heat treatment and surface strengthening process (including a variety of chemical heat treatment, surface heat treatment, rolling, shot peening, etc.); Second, the appearance of the observation and observation of parts geometry, there is no key groove, oil hole, sharp corners, threads, sudden cross-section stress concentration and so on. Observation of the deformation of the entire part to see whether the bending, necking, Hot and cold processing quality, see whether the discount