It is inevitable that aluminum foil will have some degree of wear during the production and rolling process. After study, we find that aluminum foil wear has certain characteristics.
During the rolling process of aluminum foil, new surfaces are continuously generated due to plastic deformation of metal, and there is a high unit pressure on the contact surface. In addition, high deformation temperature, high sliding speed and other characteristics make the surface adhesion of metal and roll wear especially prominent.When there is adhesion between the metal and the roll, the sliding external friction between the metal and the roll then changes into the inner friction of the metal surface, resulting in the shear deformation of the subsurface layer, thus changing the frictional state of the place where the metal is adhered, leading to the change of the stress state of the metal and the change of the flow state.As a result, the friction is increased, the force energy consumption is increased, the surface of the product is significantly damaged and the roll is rapidly worn, and the service life is shortened.
The wear condition during rolling is very complex, and the wear of metal is related to metal materials, surface oxides, processing hardening, processing temperature, speed, lubricant and surrounding environment.In the course of material deformation, wear mechanism may be one or more mechanisms working together.And the deformation itself is changing.During rolling, the roll contacts with the rolled parts repeatedly and continuously, and the surface of the rolled parts into the deformation zone is also changing constantly.In addition, the surface of the workpiece is cleaned after pickling. When the workpiece is in contact with the dirty roll surface, the possibility of adhesion is increased due to plastic deformation and extension, and the peeling of the abrasion particle. If the abrasion particle height is greater than the thickness of oil film, the particle will be pressed into the surface and play the role of grinding roll surface.
Due to different contact surface topography, contact conditions and environmental conditions, wear types are also different.However, it can be divided into mechanical wear and chemical wear.Mechanical wear is a kind of wear process related to friction, abrasive wear, erosion and fatigue.Chemical wear is caused by the erosion of surface by various active substances, followed by friction and breakage of these reactants due to mechanical action.Different types of wear can occur individually, sequentially or simultaneously.Excessive stress on the surface of wear is a common feature of wear phenomena.