Aluminum Guide Roll Surface Damage Form

Aluminum guide roll surface damage form

1, roll surface crack
Aluminum guide roller cracks are divided into normal cracks and abnormal cracks. Normal cracks are also called hot cracks. They are caused by the thermal stress generated by multiple temperature cycles, and the roll surface is gradually broken. It is a kind of micro-surface layer that occurs on the roll surface. Phenomenon; abnormal cracks are thermal shock cracks caused by accidents such as slippage, steel sticking, calendering, stacking steel, and tailing during rolling, and cracks of a certain depth and ductility are formed locally on the surface of the roll surface.


2, indentation
The aluminum guide roll indentation mainly refers to the intrusion of foreign matter such as iron oxide scale due to cleaning reasons during the production process, and irregular or irregularly shaped pits which are continuously or discontinuously distributed on the roll surface.
3, oxide film shedding
After the aluminum guide roll is rolled, after a period of hot roll, a thin layer of silver-gray or light-blue oxide film is formed on the surface of the roll, which is important for protecting the roll surface and improving the surface quality of the rolled piece due to the rolling force. The repeated action causes the oxide film to generate microcracks around the carbide; when the roll cooling capacity is insufficient, it is difficult to form a dense oxide film on the roll surface, and the oxide film is rapidly deteriorated even if it is formed. When the rolling is unreasonable, the oxide film is rapidly destroyed during the formation process, which causes the oxide film to fall off, leaving defects such as meteor spots on the roll surface, resulting in an increase in the roughness of the roll surface and an increase in the wear amount.
4, bonded steel, abnormal wear, etc.
Due to the abnormal rolling caused by the adhesion of the roll surface to the rolling stock, the aluminum guide roller has a sticking steel; the unreasonable process parameters during rolling cause excessive consumption of the same wide-kilometer roll, resulting in uneven wear on the roll surface.