Why is the temperature of the extrusion cylinder lower than the aluminum bar and die temperature?
Extrusion temperature: F is a free state for processing, in the molding process, work hardening and heat treatment conditions for the special requirements of the product, the mechanical properties of the products are not specified (not common) 6063 Aluminum Alloy melting temperature is above 655 degrees, 6063 aluminum extrusion temperature is the best temperature 490-510 degrees. Container 420-450 C, in general, temperature design of each extrusion profiles are not the same, but is probably in the range of mold temperature: 470-490 degrees, according to their own situation to set. Features: heat treatment strengthening, high impact toughness, insensitive to notch.
The casting process of aluminum bars includes melting, purification, impurity removal, degassing, slag removal and casting process. The main process is: (1) batching: according to the needs of the production of specific alloy grade, calculated the addition of various alloy ingredients, reasonable collocation of various raw materials. (2) melting: adding the raw material to the melting furnace according to the process requirements, and through degassing and removing
2. has excellent plasticity, can be high-speed extrusion into a complex structure, thin-walled, hollow profiles, or forged into complex structural forgings. Wide range of quenching temperature, low sensitivity to quench, after extrusion and forging release, as long as the temperature is higher than the quenching temperature, that is, water or water can be used to quench. Thin walled parts (delta <3mm) can also be subjected to wind hardening. 3., excellent weldability and corrosion resistance, no tendency to stress corrosion cracking. In the heat treated reinforced aluminum alloy, Al-Mg-Si alloy is the only alloy that has not found the phenomenon of stress corrosion cracking. 4., after processing, the surface is very smooth, and easy anodizing and coloring. The disadvantage is that after quenching, if it stays at room temperature for a period of time, it will have an adverse effect on the strength of the aging (parking effect). AC current is indeed spiral motion. The current is mainly concentrated on the surface of the conductor, so that the effective cross section of the conductor decreases. In addition, the alternating current and "proximity effect", the same four copper bars stacked together, the current will repel each other, resulting in copper current on both sides of the two big middle small current. Similarly, the skin effect and proximity effect exist in the steel cored aluminum strand.
