In the relation of max draft, draft is directly proportion to the radius R of the roller. But since R increases, the angle of bite decreases and so the the draft should also decrease. Then how its possible?
What is the physics behind rolling process? Most says it is due to a net friction force but which friction forces and on which direction do they act? As per my understanding, both the rolls and the material are moving along the same direction. Since friction will always act opposite to the direction of motion, thus the frictional forces here are adverse in nature. Therefore even if there is a net frictional force, it won't help in rolling process but will make the system to apply more force, more torque to roll the roller as the combined net frictional forces are in opposite direction, to both the roll and the material. Is this understanding reasonable or is it wrong? Sir, please let me know.
dude generally rollers are available above and below the metal piece so thickness and length only get affected if roller are available at the sides also then its width get affected
Actually here it is assumed that width is constant. This happens when width of metal ingot is very large compared to height of metal ingot. If b/t ratio is less then significant change in width can take place which lead to spreading. Hence vertical rollers are used to constrain the edges of metal ingot being rolled.
