Shaft part machining is one of the typical parts often encountered in machines. It is mainly used in machinery to support gears such as gears, pulleys, cams and connecting rods to transmit torque. According to different structural forms, the shaft can be divided into a stepped shaft, a tapered mandrel, an optical axis, a hollow shaft, a crankshaft, a camshaft, an eccentric shaft, various screw rods, and the like. It is mainly used to support transmission components, transmitting torque and bearing loads. The shaft type component is a rotating body part whose length is larger than the diameter, and generally consists of an outer cylindrical surface, a conical surface, an inner hole and a thread and a corresponding end surface of the concentric shaft. According to the shape of the structure.
Shaft parts can be divided into optical axes, stepped shafts, hollow shafts and crankshafts. A shaft with an aspect ratio of less than 5 is called a short axis, and a length greater than 20 is called an elongated shaft, with most of the axes being between the two. Depending on the scale of production, there are two types of forging for free forging and die forging. For small and medium batch production, free forging is used, and mass forging is used for mass production. 45 steel is a common material for shaft parts. It is cheaper and has better cutting performance after quenching and tempering, and can obtain high mechanical strength such as high strength and toughness. Alloy steel is suitable for medium precision and speed. Higher shaft parts, which have better overall mechanical properties after quenching and quenching.
After the quenching and tempering of the bearing steel and the high-frequency quenching of the surface, the bearing steel has high fatigue resistance and good wear resistance, and can manufacture a shaft with higher precision. The spindle of the precision machine tool can be selected from 38CrMoAIA nitrided steel. After quenching and tempering and surface nitriding, the steel not only achieves a high surface hardness, but also maintains a soft core and thus has good impact toughness. It has the characteristics of small heat treatment deformation and higher hardness.
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