I believe that many people have encountered a break in the motor shaft during use. Why does the motor shaft break? Stress concentration, material defects, process defects and other reasons will cause the fracture to occur. Next, we will explain this issue in detail for everyone.
Take a section from the broken shaft of the motor shaft, analyze its material composition, and conduct a mechanical performance test. It can be found that although the selected material is high-quality carbon structural steel and alloy steel, if it is not well performed The heat treatment may cause the strength of the motor shaft to deteriorate and the performance to decrease. In addition, if the materials selected during production are inappropriate or the quality of the materials is low, it is easy to cause the motor shaft to break during eating.
This is one of the common reasons for the fracture of the motor shaft. When the manufacturer designs the motor shaft, a lot of grooves and transition areas will flow out, and there will be shoulders. If the groove design is not uniform, the angle of the transition part is unreasonable. During the use of the motor shaft, it is easy to cause uneven stress distribution due to the effect of stress. In some places, the stress is too concentrated, and brittle fracture will occur at a certain moment due to excessive stress.
Due to improper processing or welding techniques, motor shaft fractures sometimes occur. When the motor shaft is welded to the ribs, low-carbon steel electrodes are required. If the welding process is improper, it is easy to cause the welding parts to cross during use. Ring cracks are formed under the action of variable stress, and then fractures occur.
In addition, when machining the motor shaft, the shaft shoulder transition art and the shaft surface processing are not superb, leaving knife marks, which will also cause the motor shaft to reduce fatigue performance and cause fracture.