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06
2021
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07
Issues with acid cleaning and annealing of cold-rolled pipe machines, as well as the increase in rollers!
Many people do not understand the principle of pickling and annealing in the cold rolling process of ordinary cold-rolled pipe mills. The manufacturers of cold-rolled pipe mills mainly introduce the principle of the pickling and annealing process. Before cold rolling, there is a layer of oxide scale on the surface of the strip steel, which needs to be cleaned. This is a step in the cold rolling process - pickling, followed by rolling. Due to work hardening, the rolled strip steel needs to be annealed, and after softening, the surface grease needs to be cleaned.
1. Many people do not understand the principle of acid pickling and annealing in the cold rolling process of ordinary cold-rolled pipe machines. The manufacturers of cold-rolled pipe machines mainly introduce the principles of the acid pickling and annealing process. Before cold rolling, there is a layer of oxide scale on the surface of the strip steel, which needs to be cleaned. This is a step in the cold rolling process - acid pickling, followed by rolling. Due to work hardening, the rolled strip steel needs to be annealed, and after softening, the surface grease needs to be cleaned.
If not cleaned properly, patches will appear on the finished strip. After treatment with grease and annealing, the surface of the strip steel becomes bright. To achieve the desired dimensions and thickness, after being processed by a leveling machine, the finished strip steel meets requirements. Before passing through the leveling machine, it can be cut according to user requirements and then recycled.
2. Increase in rollers for cold rolling machines;
The two-roll mill for cold rolling has gradually evolved into a four-roll mill; later, due to industrial production needs, it was increased to a six-roll mill. Now, in the market for rolling equipment, increasing rollers mainly aims at rolling plate thicknesses; thus there are now eight-roll, sixteen-roll, and twenty-roll series cold rolling equipment.
To stabilize the elastic stability of roller materials, small diameter rollers were used; however, this led to insufficient stiffness issues. Therefore, it was changed to the current multi-roller mills. In applications of twenty-roll cold mills, it mainly addresses issues related to rolling thicknesses less than 0.01mm for special industries. To meet requirements, both an increase in rollers and changes in rolling direction have occurred—from initial 'Z' rolling to 's' rolling and now to '1' plus 'Z' plus 's' rolling processes to meet production objectives.
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