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Hot Rolling The Basic Principles And Basic Process

Indicates the rolling hot-rolled above the recrystallization temperature of the metal is carried out. Recrystallization annealing is when the temperature is high enough, long enough, to produce a new strain-free grains (recrystallization nucleus) in fibrous tissue deformation of the metal or alloy, the new grains grow constantly, until completely original tissue deformation disappears, the metal or alloy properties are changed significantly, a process called recrystallization, grains in which the temperature starts to generate a new start is called recrystallization temperature, the temperature of the microstructure are all occupied by new grains called end recrystallization temperature, in general we call the recrystallization temperature is to begin and end the recrystallization temperature of the recrystallization temperature of the arithmetic mean, generally recrystallization temperature is mainly affected by the alloy composition, the degree of deformation, the original grain size, annealing temperature and other factors
 Hot-rolled features:
 1, low energy consumption, good plastic processing, low deformation resistance, hardening is not obvious, easy to carry out rolling, reducing energy consumption required to deform the metal
 2, hot ingots usually large, heavy reduction rolling, fast-paced production, production, and create the conditions for large-scale production
3, by hot rolling the cast structure into a working organization, by transforming the organization to make a substantial increase of the plastic material
4, characteristic rolling method determines the presence of the sheet after rolling with anisotropic properties, there is a clear difference in performance to the one material vertical, horizontal, and high, and second, there is a deformation texture and recrystallization texture in red there is a clear direction on system performance
four. Hot-rolled principle
 1, rolling theory: by means of rotating rollers are rolling friction drag between the rolling rolls, while relying on the pressure exerted by the rolls so that a compressed deformable rolling occurs between two or more rolls rolls materials processing methods
2, rolling parameters: rolling compression deformation in the thickness direction of the dominant deformation. When rolling the thickness direction by the roller compression, longitudinal and transverse metal will flow occurs, but extending longitudinal deformation is always much higher than the amount of lateral extensions, this is because of the wide roll surface friction to impede the flow of always greater than longitudinal, that is, in terms of the relative longitudinal and transverse width spread is always small, deformation index rolling mainly:  absolute reduction: that rolling absolute thickness variation rolling around, ease of production direct adjustment roll on roll gap operating values
 Processing Rate: used to record the degree of deformation  Approximate Width: production site for the exhibition represent a wide absolute increase the production site to get involved in more than a few basic parameters, such as other elongation, elongation coefficient only in order to analyze the theory. Therefore, in the field with the most is based on the plastic deformation of the metal volume invariant calculate the length, the processing rate after rolling, etc.
 3, the establishment of the rolling process: the process of rolling through a total of four stages, each stage of the bite, pull-in phase, stable rolling stage and end stage  rolling biting stage: rolled metal came into contact with the rotating roll, the roll start applying for rolling effect, drag it to the center seam roller, in order to establish the rolling process  pull-in phase: Once rolling by rotating rollers bite, roll on the rolling force increases drag, rolling gradually filled the roll gap rolling until the tip reaches the position of the center line connecting the two rollers until the  stable rolling stage: after rolling out the front end from the roll sutural, continue to rely on rotating rollers rolling frictional force to continuously and stably by roll seam, deformation of the required thickness direction of compression, longitudinally extending end  rolling stages: entry roller sutural deformation zone from the rear end started rolling, rolling until the roll is completely out of contact until the
 4, will appear in the actual rolling rolling can not be successfully roll bite, resulting in rolling process stops, and the nip angle sheet of plastic deformation caused by unreasonable situation uneven, not only reduces production efficiency and product quality tends to exist question, it is because biting and rolling process is a process of instability, when the bite when the geometric parameters of the deformation zone, the kinematic parameters are changing, so bite angle that is in contact with the roller rolling portion central angle clip is a rolling process a very important factor, reasonable bite angle should be between 15 to 20 degrees, and when the roll radius is the same, the bite angle with the reduction parabola growth
 5, stable rolling is the main stage of the rolling process