Aluminum plates sometimes have some surface problems. These problems affect their quality and the production of deep-processed products. So what are these problems? Let's take a look at it today! If you need to buy aluminum plates, we will provide you with aluminum plates without surface defects!
(1) Slippage line
Definition and characteristics: insufficient sawing amount after stretching of aluminum plate, and a regularly arranged pit formed at the end of the surface of the drawing plate.
(2) Stretch the jaw marks
The main cause: the cutting edge and the knife pad do not cooperate well.
Definition and characteristics: During the shearing process, the shear edge and the knife pad do not cooperate well, and the obvious, continuous linear marks are produced in the aluminum plate and strip edges.
(3) Knife back print
The main cause: there is a protrusion on the annealing material rack or chassis, causing injury; After sawing, aluminum chips and other debris are not cleaned and printed on the surface of the plate; During the process of winding up and stacking, hard foreign objects fall between the plates or roll into the tape.
Definition and characteristics: single or irregularly distributed depressions on the surface of aluminum plate and strip. The surface of the depression is not smooth, and the surface metal is destroyed.
(4) Indentation
The main cause: the surface moisture of the plate after quenching is not treated clean, and the traces left after being calendered by the calender; After cleaning, the drying is not good, and the surface of the plate and strip has residual moisture; Rain and other reasons caused the residual moisture on the surface of the plate and strip, which was not treated in time.
Definition and characteristics: light white or light black irregular waterline marks on the surface of aluminum plate and strip.
(5) Water marks
The main causes: rolling mills, straighteners, calenders and other equipment vibrate during the production process.
Definition and characteristics: Periodic or continuous occurrence of stripes perpendicular to the rolling direction on the surface of aluminum sheet and strip. The stripes are distributed in parallel between the single stripes, generally through the entire width of the stripe.
(6) Vibrating pattern
The main cause: the multi-roll straightening machine is stopped in the middle when straightening with a large amount of pressure.
Definition and characteristics: vertical calendering direction traverses the surface of aluminum plate and strip, and the thickness of the corrugation is abrupt.
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