rollingfase

Rollingfase, literally “rolling phase,” is a term used in metal forming to describe the deformation stage that occurs when a workpiece passes between rolling mills. During this phase, the workpiece experiences plastic deformation under the contact pressure of the rolls, leading to a reduction in thickness and an elongation of the cross-section, with corresponding changes in geometry and microstructure.

In hot rolling, the rollingfase takes place at elevated temperatures close to or above the recrystallization temperature, allowing easier deformation and contributing to grain growth and dynamic recrystallization. In cold rolling, it occurs at room temperature or modestly elevated temperatures, producing work hardening and precise thickness control.

Key aspects of the rollingfase include contact length, reduction per pass, rolling speed, temperature, lubrication, and friction between roll and workpiece. Control of these factors determines rolling force, power consumption, surface finish, flatness, and mechanical properties of the final product.

Some sources distinguish between an entry rollingfase, a steady-state rollingfase, and an exit phase as the sheet leaves the mill, reflecting changing constraints as the workpiece engages and disengages the roll bite. Because terminology varies, rollingfase is not a universally standardized term in metallurgical literature; it is used chiefly in Dutch-language material processing contexts to refer to the deformation stage within the rolling process.