The factors affecting the rolling force are:
Absolute reduction
In the roll diameter and friction coefficient of the same conditions, the contact area between rolled part and roll becomes large along with increase of absolute amount of press-down, so the rolling force increases.
Roll diameter
The contact area increases as the roll diameter increases, while the contact arc length increases, the impact of external friction intensifies, thus the rolling force augments.
Width of the rolled part
With the increase in the width of the rolled part, the contact area turns big so that the rolling force increases.
Thickness of the rolled part
With the increase in the thickness of the rolled parts, the rolling force decreases.
Rolling temperature
As the rolling temperature increases, the deformation resistance decreases, the average unit pressure decreases, thus the rolling force decreases.
Friction coefficient
With the increase in the coefficient of friction, the external friction make much effect and the rolling force turns strong.
Chemical composition of the rolled parts
Under the same conditions, the chemical composition of the rolled parts are different, the internal organization and properties of the metal are different, so there is different rolling force.
Rolling speed
When hot rolling, the deformation resistance will increase if the rolling speed becomes fast.
The deformation resistance at cold rolling will reduce with the rise of the temperature of the rolled part.
