Common faults and maintenance methods for the shaft

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What are the common faults and repair methods for the shaft?

Common malfunctions
Rotary shaft wear is a common equipment problem during the use of the shaft. It is mainly caused by the metal characteristics of the shaft: although the metal has high hardness, the retractability is poor (unrecoverable after deformation), the impact resistance is poor, and the fatigue resistance is poor, so it is easy to cause Adhesive wear, abrasive wear, fatigue wear, fretting wear, etc. Most of the shaft wear is not easy to detect. Only when there is high temperature, large amplitude of the machine, abnormal noise, etc., will it be noticed, but when people find out, most of the drive shafts are worn out, causing the machine to stop.

Traditional maintenance method
In China, the welding wear, bushing, and pitting are generally used for the shaft wear. However, when the material of the shaft is 45 steel (tempering and conditioning), if only the surfacing treatment is used, the internal stress will be generated. In the case of heavy load or high speed operation, cracks or even fractures may occur at the shoulder. If stress relief annealing is used, it is difficult to operate, and the machining cycle is long and the maintenance cost is high. When the material of the shaft is HT200, Cast iron welding is also not ideal. Some companies with higher maintenance technology will use brush plating, laser welding, micro arc welding or even cold welding. These maintenance techniques often require high requirements and high costs.

Latest maintenance method
For the above repair technology, it is not very common in Europe, America, Japan and South Korea. Developed countries generally use polymer composite technology and nanotechnology. Polymer technology can be operated on site, effectively improving maintenance efficiency and reducing maintenance costs and maintenance. strength. Among them, the most widely used is the Maxwell's technical system. Compared with the traditional technology, the polymer composite material not only has the strength and hardness required by the metal, but also has the concession (variable relationship) that the metal does not have, which can ensure the repaired part to the utmost extent. And the matching of the dimensions of the matching components; at the same time, the composite material itself has the comprehensive advantages of compression resistance, bending resistance, elongation and the like, can effectively absorb the impact of the external force, and greatly resolve and offset the radial impact force of the bearing on the shaft, And the possibility of the gap is avoided, and the secondary wear caused by the increase of the gap is avoided.