Rolling Mill Roll Pass Design

How to calculate section weights 1:- Billet weight = Side × Side × Density × Lengths 2:- Over weights = a × b × 3.1428571429 = Area  Area × Density = Weight 3:- Round weight=   πr^× Density             = Area × .00785= weight

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   ...

ROLL PASS DESIGN  We should know following things before Roll pass design  1:-   Autocad designing  2:-   Number of passes required  3:-   Section weight 4:-   Section Areas  5:-   Draft And Maximum Draft  6:-   Spread  7:-   Redaction  8:-   Elongation  9:-   Angle of bite  10:- Contact length  11:- Coefficient of Friction  12:- Forward slip  13:- Backward slip 14:- Volume rates of deformation  15:- Specific Roll pressure  16:- mps /rpm 17:- Gear ratios  18:- Power required  19:- Torque https://svinaykumar1987.blogspot.com/2021/08/roll-pass-design-for-continuous-bar-mill.html  We will explain one by one topic 

We talk about Roll frame or Stand, we are actually  referring to a pair of Roll , Roll supported by Friction bearing and antifriction bearings and bearing supported a chock and chock supported in housing  and chock slide within Housing and chock open and close by screw Example:-  Grooves pass available in both Roll top and bottom and some Roll gap available between two Roll , it is called nominal Roll gap  https://svinaykumar1987.blogspot.com/2021/08/roll-pass-design-for-continuous-bar-mill.html Passes & section  Rough passes  It Roll stand have big groove passes as Rectangulars,  Boxs,  Diamonds etc. Example:-  Intermediate passes  It stand have mediums grooves passes as Ovels , Rounds  Example:- Finish passes  It stand have small passes as flat, Rounds, Slit passes  Example:-  Passes deformation As Ovel to round,  round to ovel , ovel to flat etc

Three high rolling mill stand have three roll - Top , Middle and bottom.top and bottom roll rotate always same direction and Middle roll rotate opposite direction  Example:- three high rolling mill Roll connect with pinion gear box and gear box connect to electric motor  Example:- 

Today we will know about Reversing Mills  1- Reversing Rolling Mills( Two High Rolling Mill)  Reversing mill have two Roll and roll assemble in a frame it is called stand . We divide stand in three type https://svinaykumar1987.blogspot.com/2021/08/roll-pass-design-for-continuous-bar-mill.html 1- Roughing Stand  2- In termediate Stand  3- Finishing Stand  All stand have same work  Roll  Daimeter and roll length Can be Big  or small  according to section and section temperature should be 1200 to 900 degrees according to section size 

Basic knowledge of Rolling Mill We are explaining type of Rolling Mill  There are five types of Rolling Mill  1-  2- 3- 4- 5- Reversing rolling mills and three high rolling mills are part of hot rolling and four high mills , cluster mills and Tandom mills are part of cold Rolling mills We will explain step by step all pass , stand and All doubts