The rolling process, which is one of the best and most practical methods of shaping, consists of passing a part of the material and changing its plastic shape through passing between the rollers, which reduces the thickness of the material due to the compressive stress applied by the rollers. Rolling machines are available in two, three and four roller models. Many commonly used construction products such as beams and angles with different sections are produced by this process.
What is the hot rolling process?
If the temperature of the metal is higher than its recrystallization temperature, this process is known as hot rolling. They are rotated against each other and passed. Due to the higher speed of rotation of the rollers than the rail on which the metal is placed, the friction between the roller and the metal pushes the metal forward and increases its length and decreases its thickness.
The amount of friction between the roller and the metal surface is the measure of thickness reduction. In such a way that the rollers slide on the material instead of moving it to change its shape. In hot rolling, the ability to change shape is very high. As a result of recrystallization, the yield strength decreases significantly, for this reason, the force required for the rolling process of large parts in the hot rolling process drops significantly.
💠 Comparison of hot rolled and cold rolled products 💠
Generally, hot rolled steels have lower quality than cold rolled steels. This is because they are placed directly in the production process without spending time or a special process, so there is no need to reheat the steel. When the temperature of the steel decreases, its volume also decreases, so the amount of control to change the size and shape of the steel at high temperature is less compared to cold rolling.
Hot sheet is used to produce large-scale products. will be Hot sheet is usually used in cases where the appearance quality is not important and the mechanical properties of the product are important. The hot rolling process has various advantages and disadvantages, among which the following can be mentioned:
It requires less force during the process than cold rolling.
Less equipment and devices for Hot rolling is used.
Less hard strain is applied to the part during the process.
The produced metal part has less strength than the products produced by cold rolling.
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Hot rolling is suitable for large ingots.