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Why do aluminum bubbles make bubbles?
Nov 09, 2018

During the extrusion process of the aluminum plate, surface peeling or air bubbles are likely to occur. What is the cause? What method should I use to eliminate it? Now you will be dismissed by the aluminum board manufacturer!


What is bubble or peeling: a convex bubble appears on the surface of the product, usually in the head and tail, the complete bubble is called, and the broken one is called the skin.


First, the reason why the aluminum plate is squeezed to produce bubbles and peeling


1. Excessive wear of the extrusion tube and the pressing pad, improper matching of the size of the extrusion tube and the pressing pad, and the difference in the diameter of the used gasket exceeds the allowable value;


2. The extrusion tube and the extrusion pad are too dirty, and are stuck with oil, moisture, graphite, etc.;


3. The lubricating oil contains water;


4. There are too many shovel grooves on the surface of the ingot, too deep, or there are pores, blisters on the surface of the ingot, loose tissue, oily, etc.;


5. When replacing the aluminum alloy, the cylinder is not cleaned;


6. Extrusion barrel temperature and extrusion ingot temperature are too high;


7. The ingot temperature and size exceed the allowable negative deviation;


8. The ingot is too long, the filling is too fast, the temperature of the ingot is uneven, causing non-drum filling, so the exhaust in the cylinder is not complete, or the operation is improper, and the exhausting process is not performed;


9. The die hole design is unreasonable, or the residual material is improperly cut, and the residual material in the split hole and the flow guiding hole is partially taken out, and the gas in the gap enters the surface when pressed.


Second, aluminum sheet extrusion to generate bubbles, peeling method


1. Reasonably design the matching size of the extrusion tube and the extrusion gasket, and regularly check the size of the tool to ensure that it meets the requirements. The large tube of the extrusion tube should be repaired in time, and the pressing pad should not be out of tolerance;


2. The surface of the tool and ingot remains clean, smooth and dry;


3. When replacing the aluminum alloy, thoroughly clean the cylinder;


4. Always check equipment and equipment to prevent excessive temperature and excessive speed;


5. Strictly implement the aluminum plate process rules and various systems;


6. Reasonably design and manufacture the mold, the diversion hole and the diversion hole are designed to have an inclination of 1°-3°;


Strict operation, correct cutting of residual material and complete exhaust.