Mainly explain the role of annealing furnace, annealing furnace working principle.

Annealing furnace is a metal heat treatment process in which the workpiece is heated to a predetermined temperature, held for a certain time, and then cooled slowly. The details are as follows:

1. Improve or eliminate various organizational defects and residual stresses caused by iron and steel in the process of casting, forging, rolling and welding, and prevent workpiece deformation and cracking.

2. Soften the workpiece for cutting.

3. Refine the grain and improve the structure to improve the mechanical properties of the workpiece.

4. Prepare the organization for the final heat treatment (quenching, tempering).

Working principle of annealing furnace:

The temperature distribution in the furnace cavity of the annealing furnace is uniform through the circulation of the fan. The two chambers of the annealing furnace can run independently, which improves the annealing efficiency. There are two fans in each furnace cavity, but there is no air filter device, which is different from the actual situation. The temperature distribution in the furnace is uniform through fan circulation, and the microstructure of the film material is reconstituted through heat treatment to improve the stability and conversion efficiency. The castings are heated to about 950℃ and cooled appropriately after holding for a certain time to eliminate the internal stress of iron and steel castings and welding parts. For iron and steel products after heating began to form austenite temperature below 100 ~ 200℃, after insulation in the air cooling, you can eliminate the internal stress.