During the extrusion process of aluminum sheets, surfaces or bubbles will appear. what is the reason behind the scene? What method should be used to eliminate it? Now let me make a change for you.
What is bubble or skin: Protruding bubbles on the surface of the product are very common at the head and tail, the whole is called a bubble, and is called a broken skin.
1. Causes of bubbles and peeling in extruded aluminum plates
1. The wear of the extrusion tube and extrusion pad is very poor, the size of the extrusion tube and extrusion pad is inappropriate, and the diameter of the gasket used is larger than the allowable value.
2. The extrusion barrel and extrusion pad are too dirty with oil, water, graphite, etc.
3. Lubricating oil contains water.
4. There are too many grooves on the surface of the steel ingot, too deep, or there are pores, trachoma, loose tissue, oil stains, etc. on the surface of the ingot;
5. When replacing the alloy, do not clean the inside of the cylinder.
6. The temperature of the extrusion barrel and the temperature of the extrusion ingot are too high.
7. The ingot temperature and size exceed the allowable negative deviation.
8. The steel ingot is too long, the filling speed is too fast, and the temperature of the steel ingot is uneven, resulting in the inability to fill the steel drum, resulting in incomplete exhaust gas, or improper operation, and the exhaust process does not proceed.
9. The mold design is unreasonable, or the residue in the shunt hole and guide hole of the cutting chips is improperly vented, squeezing the surface gap into the space.
two. Eliminate bubbles and spalling by extruding aluminum sheets
1. Reasonably design the matching dimensions of the extrusion cylinder and the extrusion gasket, check the mold dimensions regularly to ensure that the requirements are met, and repair the extrusion cylinder in a timely manner without passing the extrusion gasket.
2. Keep the surfaces of tools and spindles clean, smooth and dry. Harbin Dongxing Aluminum Co., Ltd. can provide you with aluminum marine sheets.
3. Clean the cylinder thoroughly when replacing alloys.
4. Regularly check equipment and instruments to prevent excessive temperature and excessive speed;
5. Strictly implement process regulations and various systems.
6. Mold design and manufacturing, guide holes and flow guide holes are designed to be 1 degree to 3 degrees.
Strict operation, correct and complete exhaust residual shearing.
Through experts' answers to questions, I believe that everyone has a deep understanding of the causes and elimination methods of aluminum plate extrusion foam and skin. In order to avoid these problems in daily production, we can reduce losses and increase production.
