Roll pass design ( Number of passes required in Rolling)
When we talk, how many passes required in rolling then we calculate Number of passes Number of passes = log of coefficient of Elongation / log(1.29) Where 1:- Number of passes can be 6 , 9 , 15 , 19 , 21, 24, etc according Billet Size and Finished Size 2:- co-efficient of Elongation = Billet Area / Finished Size Area https://svinaykumar1987.blogspot.com/2021/09/section-areas-in-rolling-mill.html 3:- log(1.29)= 0.1105897103 Example:- Billet Size- 150×150 mm Billet Area- 22500 Finished Size- 20 mm Finished Area- 314 Co- efficient of Elongation = 22500 / 314 =71.656051 ...