The principle of

Theory of rolling: rolling is a material processing method in which the rolled parts are dragged into the rolls by the friction force of the rotating roller, and the rolled parts are compressed and deformed between two or more rolls by the pressure exerted by the roller.

Rolling parameters: rolling deformation process, thickness direction compression is the dominant deformation. When rolled piece thickness direction by roll compression, will make the metal occurs along the longitudinal and transverse flow, but the extension of the longitudinal deformation is always far more than horizontal extension amount, this is because the roller surface friction for wide block is always greater than the longitudinal flow, that is, relative to the longitudinal and lateral spread is always smaller, rolling deformation index mainly for:

Absolute drop: represents the absolute change of thickness before and after rolling, facilitating direct adjustment of roll gap value in production operation.

Processing rate: used to record the approximate degree of deformation.

Wide-spread: Used at the production site to represent the absolute value added of Wide-spread.

The most basic parameters involved in the production site are the above several, others such as elongation, elongation coefficient and so on are just for theoretical analysis. Therefore, the most used in the field is to calculate the length and processing rate after rolling according to the constant condition of the volume of metal plastic deformation.

Establishment of rolling process: There are four stages in the rolling process, which are bite stage, drag stage, steady rolling stage and final rolling stage.

1) Biting stage: the rolled piece begins to contact the rotating roll, and the roll begins to exert an effect on the rolled piece, dragging it into the roll gap, so as to establish the rolling process.

2) Pulling in stage: once the rolled piece is bitten by the rotating roller, the dragging force of the roller on the rolled piece increases, and the rolled piece gradually fills the roll gap until the front end of the rolled piece reaches the position of the center line of the two rolls.

3) Stable rolling stage: after the front end of the rolled piece comes out from the roll gap, it continues to rely on the friction force of the rotating roll to roll the piece continuously and stably through the roll gap, resulting in the required deformation, thickness direction compression and longitudinal extension.

4) The final stage of rolling: from the end of the rolling piece into the deformation area between the roll gap, until the rolling piece and roll completely out of contact.