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The reason for the cold cracking of the cutting teeth of the coal mining machine:
This material has a high carbon content. During the manufacturing process of the cutting teeth, the alloy elements have improved their relative hardening ability.
2. Poor welding process. Hydrogen element exists in the weld seam during welding and does not diffuse in time, causing the element to accumulate in the metal and generate significant stress, which can lead to a failure mode of cold cracking.
3. The thickness of the pick welding piece does not meet the standard, and the welding piece has a high stiffness, which increases the welding bonding force.
Another issue is that the cutting teeth are not uniformly heated and cooled during the welding process, which can result in cold cracks on the cutting teeth of the coal mining machine.
During the working process, the cutting teeth are subjected to significant compressive stress, shear force, and impact load, making them prone to wear and tear.
Brazing heat treatment is one of the key technologies for cutting teeth with good quality. Nowadays, the brazing and heat treatment of the cutting teeth can be said to be integrated. In fact, it is heated in a vacuum furnace, so the brazed teeth can be directly quenched without the need for air cooling, and brazing and heat treatment can be completed in one go. Only processed teeth can improve the quality.
We need to do a good job in the reliability of the cutting teeth, improve their reliability, reduce the ratio of cutting tooth loss to coal cost, thereby effectively improving the effective working time of the coal mining machine, strengthening the strengthening technology of the cutting teeth, and improving the performance of the cutting teeth. Cutting teeth are a type of equipment that is very prone to wear and tear, and their lifespan varies greatly. Even the cutting teeth produced by some domestic manufacturers can cause the blade to fall off when cutting hard coal. Therefore, we also need to improve the wear resistance and performance of the cutting teeth.