4Hi Cold Rolling Mill is a type of rolling mill used in metal processing, particularly for cold rolling steel, aluminum, and other metals to achieve precise thickness, improved surface finish, and enhanced mechanical properties.
Key Features of a 4Hi Cold Rolling Mill:
- Roll Configuration:
It consists of four rolls arranged vertically:
Two Work Rolls (smaller in diameter, in direct contact with the metal strip).
Two Backup Rolls (larger in diameter, supporting the work rolls to prevent deflection under high rolling forces).
- Purpose:
Used for cold rolling (rolling at room temperature or below recrystallization temperature).
Achieves tighter thickness tolerances, smoother surface finishes, and higher strength due to work hardening.
3.Advantages Over 2Hi Mills:
Better control over strip thickness and flatness due to reduced roll deflection.
Higher rolling loads can be applied without roll bending, enabling thinner and more precise products.
Improved surface finish due to smaller work rolls.
4.Applications:
Used in manufacturing cold-rolled steel sheets, aluminum foils, and other precision metal strips.
Common in automotive, aerospace, packaging, and appliance industries.