Rough Rolling Stage

Large - Deformation Operation: Rough rolling is the first step of the rolling process. The main purpose is to initially deform the casting billets through a relatively large reduction. Generally, the reduction rate in the rough - rolling stage can reach about 30% - 50%. This large - deformation operation can break up the original coarse - grained structure of the casting billets and lay a good foundation for the subsequent finish - rolling stage. For example, for a casting billet with a thickness of 200mm, after rough rolling, the thickness may be reduced to about 100 - 140mm.

 

 

 

Control of Rolling Passes and Speed: During the rough - rolling process, it's necessary to control the number of rolling passes and the rolling speed. The number of rolling passes depends on factors such as the initial size of the casting billets, the final product size and the performance of the rolling mill. A reasonable number of rolling passes can ensure the uniform deformation of the casting billets. Meanwhile, the rolling speed also needs to be adjusted according to the actual situation. An appropriate rolling speed can ensure that the billets have enough time to deform between the rolls, and at the same time avoid the billet temperature dropping too fast due to excessive speed, which may affect the deformation effect. In the rough - rolling stage, the rolling speed is generally a little slower than that in the finish - rolling stage to ensure that the casting billets can be fully deformed.

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