Hot rolling is performed with respect to cold rolling, which is rolling below the recrystallization temperature, and hot rolling is rolling at a temperature higher than the recrystallization temperature. To put it simply, a billet is rolled after several passes after heating, and then trimmed to be corrected into a steel sheet. This is called hot rolling. Can significantly reduce energy consumption and reduce costs. The metal is high in plasticity during hot rolling, and the deformation resistance is low, which greatly reduces the energy consumption of metal deformation. Hot rolling can improve the processing performance of metals and alloys, that is, the coarse grains in the as-cast state are broken, the cracks are healed, the casting defects are reduced or eliminated, and the as-cast microstructure is transformed into a deformed structure to improve the processing properties of the alloy.
Aluminum sheet hot rolling process
Aluminum sheet: The hot rolling process of the product includes the preparation process of rolling raw materials and the rolling process. The preparation process of the rolled raw material includes sawing of the ingot at the end of the ingot, side milling or edging, milling, scouring, welding of the aluminum or composite board, or bundling and heating. The rolling process includes rough rolling and finish rolling. In the rolling process, it is mainly the process of interaction between the rolls, the rolling stock and the emulsion.
Hot rolling generally refers to rolling at temperatures above the metal recrystallization temperature. During the hot rolling process, the metal deformation has both hardening and softening processes. Due to the influence of the deformation speed, as long as the recovery and recrystallization process are too late, the metal will have certain work hardening with the increase of the degree of deformation. However, in the hot rolling temperature range, the softening process plays a leading role. Therefore, at the end of hot rolling, the recrystallization of the metal is often incomplete, and the hot rolled aluminum alloy sheet strip exhibits a state of recrystallization in which the recrystallized and deformed structures coexist.
Hot rolled aluminum and aluminum alloy products are generally divided into two categories, one is hot rolled coil and the other is hot rolled thick plate.
Hot-rolled slabs are aluminum and aluminum alloy sheets with a thickness of not less than 7.0. The main types are hot-rolled sheets, annealed sheets, quenched or quenched pre-stretched sheets. Hot-rolled slabs are usually produced by a block method on a hot rolling mill. The traditional process is: ingot homogenization - milling - heating - hot rolling - length cutting - straightening. The thickness is less than 7.0. Aluminum and aluminum alloy strips are usually produced by hot-rolled coil. The products are mainly used for cold-rolled billets, and also used for producing sheets. The modern production process is: ingot milling surface-heating (smooth heating) 〉 ─ hot rough rolling - hot milk - bale weighing.