ã€China Aluminum Industry Net】Aluminum production often encounters false joints on the surface, scratches on the surface, mechanical lines, black lines on the surface, bumps on the surface, serious welding seams, etc. The black belt or the color difference seriously causes the product to be scrapped, causing irreversible damage. The reason why the welding force is low is because the extrusion force is too low, and the factor that causes the low extrusion force of the aluminum alloy profile has the factors on the mold as well as the process. Extrusion temperature and extrusion speed of aluminum alloy profile The high temperature of aluminum rod is beneficial to the diffusion bonding of metals, but it also leads to the intensification of metal bonding die phenomenon. At the same time, the temperature is high, which leads to the growth and growth rate of metal grains. Accelerated and therefore will make the weld microstructure thick. The extrusion speed is too high, the metal deformation work increases, and the metal temperature rises more. In addition, the extrusion temperature is too high, the pressing force will be reduced, which in turn reduces the welding force. In fact, when a graphite product is used as a slip-out station, the profile is prone to black bands after oxidation on the side in contact with the graphite.
The failure of aluminum alloy extrusion hot die is mainly caused by cracking, wear, erosion corrosion, overheating and thermal fatigue cracking. The lubrication conditions of the mold have a great influence on the life of the mold. In the extrusion process of aluminum and aluminum alloy materials, it is also very necessary to use lubricants to reduce the friction between the metal and the barrel wall, the piercing pin and the surface of the mold, and reduce the adhesion between them and the wear of the tooling.
In the past, due to the limitation of technical factors such as the R&D of new materials, the improper use of lubricants often resulted in surface contamination of products and lubricants might flow into the center of the product, resulting in a more pronounced “squeezeâ€. Therefore, in the extrusion of aluminum and aluminum alloy bars and profiles, "lubrication-free extrusion" has been used for many years. In the extrusion of tubes and hollow aluminum alloy profiles, only the surface of the die surface and the surface of the piercing needle are lubricated. In recent years, countries around the world have been trying to squeeze large and complicated hard aluminum alloy profiles on extruders with limited extrusion pressure, and also to increase the extrusion speed and to obtain extruded materials with more uniform structural properties. A wide range of researches have been carried out, and due to breakthroughs in the tooling structure and lubricant research, the lubrication extrusion method has been greatly developed and the JONYE high temperature lubricant has emerged.
Especially for aluminum extrusions in the high-temperature extrusion process, welding quality problems, the work of the mold will have scratches and other issues, spraying JONYE high temperature lubricant, at room temperature can prevent the work surface rust, a long period of preheat can No decarburization and oxidation occurs on the surface of the protective work belt, the original hardness of the working belt surface is maintained, soft spots and soft belts are not generated, the lubrication between the die and the die can be increased when the aluminum alloy profile is extruded, and the friction between the die and the die is reduced and avoided. Die blocking and crushing, making the production more smooth, reducing the quality of welding, reducing the production of ripple, improving the smoothness of the product, preventing adhesion, avoiding sticking, sticking aluminum, reducing the number of repairs to the mold , to extend the use of mold.
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