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At present, in China, the excavator of the soil exchange series products is in service. Due to the extreme standardization of the working plan of the bucket teeth, which are used for iron ore, rock layers, or soil, the excavation work not only requires the bucket teeth to be dragged and damaged, but also needs to bear a certain destructive load, which greatly reduces the service life of the bucket teeth and turns them into consumable spare parts. Due to the low compressive strength of the surface layer of the bucket teeth, their wear resistance is poor and they are destroyed. Some of them are brittle after being subjected to certain destructive effects due to insufficient plasticity, which not only causes loss of raw materials and harm to social and economic development, but also immediately harms production and processing progress. Therefore, in an ideal situation, the surface material of excavator bucket teeth should have high strength and wear resistance, and the basic material should have the characteristics of high wear resistance and super wear resistance. However, it cannot be guaranteed by a single material.
So far, the bucket teeth of Chinese excavators are mainly produced and processed from low-carbon steel, and a part of them are also produced and processed from carbon steel. However, it is generally felt that after quenching and tempering treatment, low carbon steel transforms into an austenitic structure. When subjected to strong destructive loads, the surface of the metal material undergoes plastic deformation, and there is significant strain hardening in the deformation layer, accompanied by a significant increase in surface hardness. The original text provides a detailed explanation of the application of wear-resistant spray welding in improving the service life of bucket teeth based on actual on-site applications.
During excavation work, the bearing capacity of each mining tooth that comes into contact with the excavated material varies at different stages of the excavation process. When the tooth tip of the bucket first touches the surface of the raw material, due to the fast speed, the tooth tip of the bucket will be subjected to a more prominent destructive load. If the compressive strength of the bucket tooth material is low, it will cause plastic deformation at the tip. With the improvement of deep excavation, the bearing capacity of bucket teeth will change. When the bucket tooth fiber laser cuts raw materials, the relative velocity between the bucket tooth and the material is caused in the middle, resulting in particularly large extrusion processing on the surface, thereby causing large sliding friction between the bucket tooth coal mining and the raw material in the middle. If the raw materials are rock layers with very high compressive strength, cement concrete, etc., the sliding friction is likely to be very high. The conclusion that this entire process continues to work is that the surface layer causes varying degrees of surface damage during the operation of the bucket teeth, which in turn leads to deep and very large plowing grooves causing damage to the bucket teeth. Therefore, the quality of the wear-resistant layer on the surface of the bucket teeth immediately affects the length of their service life.
So far, the bucket teeth of Chinese excavators are mainly produced and processed from low-carbon steel, and a part of them are also produced and processed from carbon steel. However, it is generally felt that after quenching and tempering treatment, low carbon steel transforms into an austenitic structure. When subjected to strong destructive loads, the surface of the metal material undergoes plastic deformation, and there is significant strain hardening in the deformation layer, accompanied by a significant increase in surface hardness. The original text provides a detailed explanation of the application of wear-resistant spray welding in improving the service life of bucket teeth based on actual on-site applications.
During excavation work, the bearing capacity of each mining tooth that comes into contact with the excavated material varies at different stages of the excavation process. When the tooth tip of the bucket first touches the surface of the raw material, due to the fast speed, the tooth tip of the bucket will be subjected to a more prominent destructive load. If the compressive strength of the bucket tooth material is low, it will cause plastic deformation at the tip. With the improvement of deep excavation, the bearing capacity of bucket teeth will change. When the bucket tooth fiber laser cuts raw materials, the relative velocity between the bucket tooth and the material is caused in the middle, resulting in particularly large extrusion processing on the surface, thereby causing large sliding friction between the bucket tooth coal mining and the raw material in the middle. If the raw materials are rock layers with very high compressive strength, cement concrete, etc., the sliding friction is likely to be very high. The conclusion that this entire process continues to work is that the surface layer causes varying degrees of surface damage during the operation of the bucket teeth, which in turn leads to deep and very large plowing grooves causing damage to the bucket teeth. Therefore, the quality of the wear-resistant layer on the surface of the bucket teeth immediately affects the length of their service life.
