CZ automatic purlin changing machine factory display

Support customization of C-type, Z-type, CZ automatic changeover and other purlin machines

Compared to hot-rolled strip steel (see the production process of hot-rolled wide strip steel and hot-rolled narrow strip steel), the rolling process of cold-rolled strip steel (see the production of cold-rolled sheet and strip) has the following characteristics:(1) The use of process lubrication and cooling, to reduce the deformation resistance during rolling and cool the rolls;

(2) The use of high tensile rolling, to reduce deformation resistance and maintain stability during the rolling process. The average unit tensile value used is 10% to 60% of the material's yield strength, generally not exceeding 50%;

(3) The use of multiple rolling passes. Due to cold rolling causing work hardening of the material, when the total deformation reaches 60% to 80%, continuing deformation becomes difficult. Thus, intermediate annealing is required to soften the material so that rolling can continue. To obtain the required thin strip steel, such intermediate annealing may need to be performed multiple times. The rolling between two intermediate annealings is called one rolling pass. The annealing of cold-rolled strip steel is conducted in protective gas continuous annealing furnaces or bell-type annealing furnaces (see cold-rolled sheet and strip annealing). The minimum thickness of cold-rolled strip steel can reach 0.05mm, and cold-rolled foil can reach 0.001mm.