Determination method of rolling reduction ratio in cold rolling

摘要

The present invention relates to a method for determining a rolling reduction rate applied to each stand of a rolling mill during cold rolling, and inputting and calculating data on rolling conditions of a continuous cold rolling mill to calculate a rolling ratio of each stand when the plate temperature is higher than the set temperature. In the method of determining the rolling reduction ratio to be changed, the total reduction ratio is Γ _j^* = α ₁ γ _j (j: stand reaching maximum temperature) while satisfying (H ₁ : thickness of hot rolled coil, H _f : thickness of final product). A, γ ₁^* = α ₂ γ ₁ (Stands remaining except for i: j… B (0.93 α ₁ 0.96, 1.01? Α ₂ 1.03) Cooling by automatically allocating the reduction ratio for each stand It is easy to prevent the occurrence of heat scratch without the installation or replacement of equipment. It is a method of determining the rolling reduction ratio during cold rolling that reduces the cost and increases the reliability of the product.