What problems will be encountered in the process of heat treatment of the jaw plate of the crusher using high frequency induction heating equipment?

After the jaw plate of the crusher is made of high-manganese steel, it needs to be heat-treated by high-frequency induction heating equipment. Finally, the hardness, cracks, and carbide precipitation of the completed jaw plate are inspected to see if it meets the technical requirements. The following is a summary of the problems that occur during the heat treatment of the jaw plate of the crusher, and there are corresponding measures to prevent and correct them.

1. During the working process, some cracks will appear on the surface of the jaw plate. This is caused by the unqualified casting during casting. Due to the impact load force, the shrinkage cavity of the jaw plate and the loose surrounding cracks , which become larger after fatigue stretching. It may also be the cracks generated during heat treatment, the thermal conductivity and thermal expansion coefficient are very low, the speed of water temperature rise is not well grasped during water toughening treatment, and the time is not well grasped, resulting in the precipitation of carbides on the surface of the jaw plate of the crusher. For this kind of problem, we must strictly control the quality of the castings, and control the heating rate and water cooling time to avoid excessive water temperature.

2. Carbide precipitates on the surface of the jaw plate. This is due to improper cooling, insufficient heating time or too low heating temperature of high-frequency induction heating equipment. Carbide cannot be completely dissolved in austenite, so this will happen. phenomenon. For this problem, it is necessary to operate in strict accordance with the appropriate heat treatment heating temperature and holding time, and control the temperature of the cooling water according to the requirements of the process to ensure that the carbides inside the jaw plate of the crusher can be fully dissolved.

3. If the hardness of the jaw plate of the crusher is unqualified, water toughening treatment can be carried out again to ensure that the temperature of the water meets the requirements.

4. The surface of the jaw plate is worn, which is caused by the incorrect process of water toughening treatment and too low carbon content. For this problem, we must first check whether the raw materials for making the jaw plate are qualified, and carefully check the heat treatment according to the requirements Whether the process parameters are correct and meet the requirements.

5. Decarburization occurs on the surface of the jaw plate of the crusher. This is due to the lack of heating in a protective environment when the high-frequency induction heating equipment is used for heating, or the heating time is too long. If the jaw plate has decarburization Phenomenon, the decarburized layer will turn into martensitic structure after cooling in water, but its surface toughness is very low, and it cannot be well combined with the internal austenite. In the case of impact wear, the surface layer will There is a phenomenon of shedding. For this problem, we can heat in a vacuum environment, and the required time is not too long, and the speed of water cooling should be fast, so as to avoid or reduce the decarburization of the surface of the jaw plate.