Sendzimir Mill Intermediate Roll Maintenance
Because of its high rolling speed and precision, the Sendzimir mill is favored by some high-end users for rolling ultra-thin strips and silicon steel, stainless steel and so on. The mills of the Sendzimir mill use tool steel, abrasive steel, and high-speed steel. Higher quenching and tempering temperatures are typically required during the manufacturing process. In order to meet the hardness requirements, a second tempering is required. Product hardness range: 55-60 HRC, 60-63 HRC, 61-64 HRC, 63-66 HRC, etc.
In the maintenance of Sendzimir mill intermediate roll, the following three problems should be noted:
The first is to correctly judge the number of uses. The number of times the Sendzimir mill intermediate roll is used between two grindings depends on the oxide film and roughness maintenance of the roll surface after each lowering. Under normal circumstances, the front frame can be used 3 times to 7 times, the rear frame can be used 2 times to 4 times, and the CPC Sendzimir intermediate roll can even be used more than 10 times.
The second is to use the roll surface inspection method to avoid the Sendzimir roll failure accident. After the Sendzimir mill intermediate roll is removed, it must be water-cooled or air-cooled immediately to ensure thermal expansion is eliminated before the next use. The Sendzimir intermediate roll is prone to thermal cracking, and the Sendzimir mill intermediate roll must be replaced immediately if the rolling is abnormally stopped. In order to avoid failures such as Sendzimir roll spalling, the surface crack detection should be performed using an ultrasonic flaw detector after the Sendzimir roll is cooled.
The third is to use professional tools to enhance the grinding effect. Due to the high hardness of the Sendzimir intermediate roll, it is difficult to grind, and special grinding wheels and automatic grinding machines are required. After the grinding is completed, the composite flaw detection of the roll surface is performed by using an eddy current flaw detector and an ultrasonic flaw detector. After the normal Sendzimir intermediate roller is ground, the micro-thermal crack can remain on the machine. The Sendzimir mill intermediate roll, which is driven by a rolling accident, must increase the amount of grinding on the basis of grinding and removing the crack on the roll surface.
