Extrusion: The extrusion speed must be carefully controlled during the extrusion process. Extrusion speed has an important influence on deformation heat effect,Aluminum for building deformation uniformity, recrystallization and solid solution process,Aluminum for building product mechanical properties and product surface quality.
In order to improve production efficiency, based on years of production discussions and accumulated experience,Aluminum for building our main extrusion methods currently follow the "low temperature and high speed" production process,Aluminum for building that is, the temperature of the aluminum rod is inversely proportional to the extrusion speed, Aluminum for building and the temperature of the aluminum rod is high and the extrusion The speed is appropriately slowed down,Aluminum for building the temperature of the aluminum rod is low, and the extrusion speed is appropriately increased. Through this adjustment mode,Aluminum for building the extrusion production is adjusted to the best state.
Under normal circumstances,Aluminum for building the upper mold can be cooled and accelerated when the third rod is produced. The temperature of the flat mold aluminum rod is reduced to 390-410°C,Aluminum for building and the temperature of the split mold aluminum rod is reduced to 410-430°C. Is the best.
Online Quenching: Quenching is to keep the Mg2Si solid-dissolved in the base metal at high temperature after being quickly cooled to room temperature after being ejected from the mold. Containing 0.6-0.9% of Mg2Si,Aluminum for building the critical cooling temperature range is reduced from about 500 degrees to 204 degrees,Aluminum for building the minimum cooling rate is not less than 180 degrees C/min, water cooling can be used,Aluminum for building the hardness of 6061 alloy aluminum template is required to be ≥15HW, and its large section is quenched For cooling,Aluminum for building 549℃/min is recommended.
For extrusion on-line quenching,Aluminum for building the cooling rate should be based on the principle of ensuring that the supersaturated solid solution is condensed. For products that can be straightened,Aluminum for building the warpage caused by quenching is limited to the correctable limit.