How to deal with peeling and bubble of 5052 aluminum extrusion surface
aluhm > 12-19-2017, 07:43 AM
In the 5052 aluminum plate extrusion process, it is easy to cause surface peeling or bubbles. What’s the reason of it? And how to eliminate it?
Bubble or peeling: the surface of the product appears convex bubble, common in the head, tail, complete called the bubble; broken bubble is called the peeling.
The reasons for peeling and bubble of 5052 aluminum extrusion surface:
1, extrusion cylinder, extrusion pad wear tolerance, extrusion cylinder and squeeze pad size with improper, the use of gasket diameter difference exceeds the allowable value;
2, squeeze the cylinder and squeeze the pad is too dirty, sticky oil, moisture, graphite and so on;
3, lubricating oil contains water;
4, ingot surface shovel groove too much, too deep, or ingot surface with pores, trachoma, loose tissue, oil and so on;
5, the replacement of the alloy, the tube is not clean;
6, squeeze the cylinder temperature and squeeze the ingot temperature is too high;
7, ingot temperature, size exceeds the allowable negative deviation;
8, the ingot is too long, filled too fast, uneven ingot temperature, causing non-drum filled, so the cylinder exhaust is not complete, or improper operation, not the implementation of exhaust process;
9, die hole design is unreasonable, or cut off the material improper, shunt holes and diversion holes in the material is partially out, squeeze the gap in the gas into the surface.
The methods to deal with peeling and bubble of 5052 aluminum extrusion surface:
1, the rational design of extrusion cylinder and squeeze gasket with the size, often check the tool size, to ensure compliance with the requirements, squeeze the barrel to be timely repair, squeeze pad can not be poor;
2, tools, ingot surface to keep clean, smooth and dry;
3, replace the alloy, the thorough clearance;
4, often check the equipment and equipment to prevent the temperature is too high, too fast;
5, strict implementation of the laws and regulations and the system;
6, reasonable design, manufacturing tooling, diversion holes and diversion holes designed to 1 ° -3 ° slope.