During the production process of aluminum alloy profiles, problems such as surface false joints, surface scratches, mechanical lines, black lines on the surface, uneven surface feel, and serious welding seams are often encountered. After surface treatment, aluminum alloy profiles exhibit black bands or severe color differences, resulting in product scrapping and irreparable losses.
Cause of occurrence:
The low welding force is due to the low extrusion force, which is caused by factors such as mold and process. The high extrusion temperature and extrusion speed of aluminum alloy profiles are conducive to the diffusion and bonding of metals, but it also exacerbates the phenomenon of metal bonding to molds. At the same time, the high temperature also leads to the acceleration of grain growth and growth rate of the metal structure, which will make the weld microstructure coarse.
If the extrusion speed is too high, the metal deformation work increases, and the metal temperature increases significantly.
In addition, if the extrusion temperature is too high, the extrusion pressure will decrease, thereby reducing the welding force. In fact, when graphite products are used as discharge slides, the profile is also prone to black bands after oxidation on the side in contact with graphite.
The failure of aluminum alloy profile hot extrusion molds is mainly caused by reasons such as cracking, wear, erosion corrosion, overheating, and thermal fatigue cracks. The lubrication conditions of the mold have a significant impact on its lifespan. In the extrusion process of aluminum and aluminum alloy materials, it is also necessary to use lubricants to reduce the friction between the metal and the extrusion cylinder wall, piercing needle, and mold surface, reduce their adhesion and wear of the tool and mold.
In the past, due to technological limitations such as the development of new materials, improper use of lubricants often led to surface contamination of products, and lubricants may flow into the center of the product, forming a more obvious "squeezing tail".
Therefore, in the extrusion of aluminum and aluminum alloy bars and profiles, "non lubricated extrusion" has been used for many years. In the extrusion of pipes and hollow aluminum alloy profiles, lubrication is only applied to the mold surface and the surface of the piercing needle.
Solution:
In recent years, countries around the world have conducted extensive research on lubrication extrusion methods in order to extrude large and complex hard aluminum alloy profiles on extrusion machines with limited extrusion pressure, as well as to improve extrusion speed and obtain extruded materials with more uniform microstructure and properties. Due to breakthroughs in the research of mold structures and lubricants, lubrication extrusion methods have made great progress, and JONYE high-temperature lubricants have emerged as the times require.
Especially for the welding quality issues and scratches on the working strip of aluminum profiles during high-temperature extrusion, JONYE high-temperature lubricant is sprayed to prevent surface rust at room temperature. Long preheating periods can protect the surface of the working strip from decarburization and oxidation, maintain the original hardness of the working strip surface, and avoid soft spots and strips.
When extruding aluminum alloy profiles, it can increase lubrication between the mold, reduce friction with the mold, avoid mold blockage and collapse, make product production smoother, reduce welding quality issues, reduce ripple generation, improve product smoothness, prevent bonding, avoid mold sticking, aluminum sticking, reduce the number of mold repairs, and extend mold usage time.
