Uses: Used for agricultural tractor products. The transmission shaft of the main tractor to output power to farm tools mainly bears torque. In order to protect tractors and farm tools, this piece is a relatively weak building, parts, and wearing parts, and the strength requirements cannot be too high or too low. Features: It is a kind of transmission shaft parts. The two ends of the shaft are respectively connected with tractors and farm tools, and have the characteristics of quick change and quick link, the requirements for matching spline and outer circle diameter are high, the strength has upper and lower limits, and the requirements for materials and heat treatment are very high. Process requirements: Blanks are generally made of steel bars or forgings. The main processes include quenching and tempering-turning-knurling-induction quenching-grinding and other processes. The main processing equipment includes numerical control lathe, numerical control cylindrical grinder, quenching equipment and gear hobbing machine equipment. Key inspection items: spline, surface roughness, appearance, coaxiality, cylindricity and other items; Key inspection equipment: special spline inspection tool, large and medium-sized precision coordinate measuring machine;