Reasonable selection of materials and technical requirements for heat treatment are important for improving the strength and service life of shaft parts. At the same time, it has a great influence on the machining process of the shaft.
1. Materials of shaft parts Generally, 45 steels are used for shaft parts. Different heat treatment specifications (such as normalizing, quenching and tempering, quenching, etc.) are used according to different working conditions to obtain certain strength, toughness and wear resistance. For medium-precision and high-speed shaft parts, alloy steel such as 40Cr can be used. After being quenched and tempered and surface quenched, this type of steel has a high comprehensive mechanical strength. Highly accurate shafts, sometimes bearing steels such as GCrls and spring steel 65Mn, have higher wear resistance and fatigue resistance after quenching and tempering. For shafts operating under conditions of high speed and heavy load, low carbon gold-containing steel such as 20CrMnTi, 20MnZB, 20Cr or 38CrMoAIA nitrided steel may be used. After low-carbon alloy steel is carburized and quenched, it has high surface hardness, impact toughness and core strength, and heat treatment deformation is small.
2. Blanks for shaft parts The most commonly used blanks for shaft parts are round bars and forgings. Only some large, complex shafts are used for castings.
Although there are many technical requirements for machining mechanical parts, we usually have access to these commonly used ones. I hope to help you better understand the mechanical parts processing industry.