May 15, 2019
The selection of the material of the shaft parts is mainly determined according to the strength, rigidity, wear resistance and manufacturing process of the shaft, and strives to be economical and reasonable. Commonly used shaft parts are 35, 45, 50 high-quality carbon steel, which is the most widely used 45 steel. Ordinary carbon steels such as Q235 and Q255 can also be used for shafts that are less loaded or less important. Alloy steel can be used for large forces, axial size, weight restrictions or some special requirements.
For example, 40Cr alloy steel can be used in medium precision and high speed work. The material has good comprehensive mechanical properties after quenching and tempering. Alloy steels such as Cr15 and 65Mn can be used for high precision and poor working conditions. These materials have good wear resistance and fatigue strength after quenching and quenching; if they are shaft parts working under high speed and heavy load conditions, low carbon steel such as 20Cr, 20CrMnTi, 20Mn2B or 38CrMoA1A is used.
Carbon steel, after carburizing and quenching or nitriding, not only has a high surface hardness, but also greatly improves the strength of the core, so it has good wear resistance, impact toughness and fatigue strength. Ductile iron and high-strength cast iron are often used in the manufacture of shafts with complex shapes due to their good casting properties and vibration damping properties. In particular, the rare earth-magnesium ductile iron developed in China has good impact toughness, and also has the advantages of friction reduction, vibration absorption, and low sensitivity to stress concentration. It has been applied to the manufacture of important shaft parts for automobiles, tractors and machine tools.