When metal is rolled at a temperature below its recrystallization temperature, the technique is known as cold rolling. The yield strength and hardness of the metal are raised by compression and squeezing.
A unique area of the metalworking sector is the cold rolling of metal strips. This method aims to produce thinner metal strips for a range of applications with excellent dimensional precision and dedicated surface quality.
The initial material can be cut into strips up to approximately 2 meters wide and several millimeters thick. Cold rolling mills, on the other hand, have the ability to process and create incredibly thin strips that are close to 10 microns thick and just a few centimeters wide.
Cold rolling, as opposed to hot rolling, is done at room temperature. In order to keep the metal temperature below the temperature of recrystallization, forced cooling is typically used, resulting in improved physical and surface qualities.
Using high-performance, neat cold rolling oil for lubrication in the roll bite and cooling of the metal strip and work rolls results in the highest surface quality of the end product.
The cold rolling oil must lubricate and function in harsh circumstances in addition to cooling.
In the roll bite, local microarea pressures can be quite high.
The boundary and mixed systems are often where the lubrication regime occurs, and it changes on a microscale.
The roll bite should not have full hydrodynamic lubrication since it causes a loss of grip. Low grip makes it difficult to manage the strip, increases speed fluctuations, and may produce varying thicknesses, which leads to numerous surface flaws.
A suitable base oil and a well-balanced mixture of different additives are needed for a cold rolling oil to operate at its best in boundary and mixed lubrication regimes. For any cold rolling process, Runshi’s technical professionals have the necessary knowledge and experience to provide the finest result.
In order to enhance our clients' cold rolling process, we collaborate closely with them. As a result of these efforts, the mill engines' energy consumption initially decreases, and their surface quality is enhanced because of increased lubrication that minimizes friction.
Even more noteworthy is the improved productivity attained at several clients across the world by lowering the number of passes necessary at reversing mills while still attaining the requisite end thickness of the metal strip. Only improved lubricity, which permits greater decreases with each pass, makes this conceivable.