Furnace Charging Comprehensive Optimization Technology of the Bell-type Annealing Process

Sticking defect in the bell-type annealing process is closely related to furnace charging technology. Unsuitable furnace charging technology increases the additional radial pressure of some coils in the furnace and leads to sticking defect. A suitable furnace charging comprehensive optimization technology of the bell-type annealing process is introduced, which aims at sticking prevention. This technology was developed after field experiments and theoretical analyses based on defining the concept of sticking index, considering the influences of coiling technology, coil size, product specifications, and annealing technology on the steel internal stress. The coil work-base quantity was as close as possible to the theoretical minimum value, and the average and peak sticking index value of the same batch of coils as the target were minimized, balanced with production efficiency and defect prevention. This technology was applied to the production practice of a cold-rolled sheet plant, achieving good using effect with furnace charging efficiency. Production increased, and sticking defect decreased. Considerable economic benefit for the enterprise was created with further popularization and application values.