One of the common phenomena encountered is the uneven surface of aluminum plates, so what is the reason for the uneven and wavy surface of aluminum plates? There are many reasons why aluminum plates fail to pass the standard, such as problems with the setting of extrusion molds for aluminum plates, and difficulties with supporting point pads. Below is a detailed list of reasons for causing bumps and depressions in the surface layer of aluminum plates:
(1) The ratio of strip length to die length in aluminum plate extrusion die work or the incorrect design of die size can cause serious imbalance in the flow velocity ratio.
(2) There are blocking angles and flow promoting angles in the operation of aluminum plate extrusion molds.
(3) There is a fluctuation ratio deviation in the operation of the left and right dies of the aluminum plate extrusion mold.
(4) The left and right dies of the aluminum plate extrusion mold have uneven surfaces and a bell mouth during operation.
(5) The lower mold resistance (flow divider) table in the aluminum plate extrusion mold core is relatively high, and the groove (size, thickness, and position) with feeding or drainage methods is incorrect during work.
(6) During the operation of the aluminum plate extrusion mold, there are too few or even no empty knives on both sides of the belt (the spark discharge is not properly set) or there is a large amount (the belt is dry and cracked due to no support points during the operation).
(7) New or repaired aluminum plate extrusion molds have uneven belt finish levels during injection mold work due to uneven belt polishing in the mold manufacturer's coarse sand polishing process.
(8) Some aluminum plates carry oil stains during pressing.
(9) The support point pad is too small to block.
(10) Waves appear up and down 1m from the tail of the aluminum plate (V3 volume aluminum pressing).