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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Axis data and blanks Shaft data and blanks
1. Axis data: Firstly, there should be satisfactory strength; low sensitivity to stress gathering, satisfactory stiffness, wear resistance, corrosion resistance and outstanding processability. Commonly used materials are carbon steel, alloy steel, ductile iron. And high strength cast iron. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
When selecting the data of the shaft; should consider the size and nature of the load on the shaft, the rotational speed bump, the surrounding environment, the shape and scale of the shaft, the production batch, the importance, the mechanical properties of the data and the economics; :
.1) Carbon steel has satisfactory high strength; low sensitivity to stress gathering; easy to carry out various heat treatment and machining; low price, sufficient supply; therefore the most widely used. usually in the machine shaft; available 30, 40, 45, 50 and other trademarks of high-quality medium carbon steel; especially 45 steel after quenching and tempering is the most commonly used.
.2) Alloy steels have higher mechanical properties; are often used to produce high-speed, heavy-duty shafts; or shafts that are stressed and require small, lightweight shafts; shafts that operate in high-temperature, low-temperature or corrosive media; Alloy steel production. Commonly used alloy steels are: 12CrNi2, 12CrNi3, 20Cr, 40Cr, 38SiMnMo and so on.
.3) After various heat treatment, chemical treatment and external reinforcement treatment; can improve the strength and wear resistance of the shaft made of carbon steel or alloy steel, especially alloy steel; Mechanical properties.
.4) Alloy steel is highly sensitive to stress gathering; therefore, the layout shape of the alloy steel shaft needs to be reasonable; otherwise the meaning of the alloy steel is lost. Others; at normal operating temperatures; the elasticity of alloy steel and carbon steel The modulus is very close; therefore, it is impossible to improve the rigidity of the shaft by selecting alloy steel; at this moment, it should be treated by increasing the shaft diameter.
.5) The mechanical strength of ductile iron and high-strength cast iron is lower than that of carbon steel; however, it is easy to obtain the appearance of messy parts due to the good casting process; good vibration absorption and wear resistance; low sensitivity to stress gathering; Therefore, the use is increasing.
2. Shaft blank:
It can be obtained by rolling round steel, casting, welding, casting, etc. for shafts or long shafts with low demand; when the blank diameter is less than 150mm; rolling round steel can be used, and the force is large; The blank can be supplied by casting, and the weld blank can be used for the shaft with a large diameter and a small number of pieces, and the shaft with large batch size, disordered shape and large scale can be produced; the blank can be cast.
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Source: China Bearing Network Time: 2018-05-24