1、 Melting and Casting Process: High Temperature Smoke Treatment and Environmental Control

Smelting is the starting point of aluminum profile production, which requires heating the aluminum ingot to 660-750 ℃ to melt it. This process generates a large amount of high-temperature flue gas (including aluminum dust and volatiles), and a stable working environment needs to be maintained around the furnace.

Smoke exhaust: A dedicated high-temperature fan is installed in the exhaust pipe of the smelting furnace (such as the reflector furnace and intermediate frequency furnace), which needs to withstand a smoke temperature of 300-500 ℃. The smoke containing aluminum powder is pumped to the bag filter through stable air pressure. The fan impeller is made of wear-resistant cast iron or coated with ceramic on the surface to prevent aluminum powder from adhering and causing impeller imbalance. At the same time, it is adjusted with frequency conversion control to ensure stable negative pressure in the furnace (preventing smoke from overflowing and polluting the workshop).

Workshop ventilation: The ambient temperature in the smelting area is high (up to 40-50 ℃), and axial flow fans or mixed flow fans are required for forced ventilation. This type of fan is designed with an anti-corrosion coating (to resist the volatile acidic gases during the melting process), and the hot air is discharged from the workshop through a directional air duct, while introducing fresh air to ensure the safety of the working environment for workers.

2、 Extrusion molding process: mold cooling and profile heat dissipation

Squeezing is the core step in shaping aluminum profiles. Aluminum rods are extruded into specific cross-sections through molds at high temperatures of 500-550 ℃. The molds and the newly extruded profiles need to be rapidly cooled to ensure dimensional accuracy.

Mold cooling fan: The extrusion mold will heat up (up to 300 ℃) due to friction during continuous operation. If the temperature is too high, it will cause deformation of the mold and affect the size of the profile. The dedicated axial flow fan blows cold air into the working area of the mold through a circular air duct, and the air volume can be dynamically adjusted according to the extrusion speed (2-10m/min) to ensure that the mold temperature is stable at 150-200 ℃. A guide plate is installed at the air outlet of the fan to concentrate the airflow on the mold cavity, resulting in a 40% increase in cooling efficiency compared to ordinary fans.

Profile air cooling: The temperature of the just extruded profile is about 300-400 ℃, and it needs to be cooled and shaped immediately (to avoid oxidation, discoloration or deformation). A dedicated centrifugal fan blows strong airflow onto the surface of the profile through a bellows, with a wind speed controlled at 15-25m/s, to cool the profile to below 100 ℃ within 10-30 seconds. For different cross-sections (such as thin-walled profiles and complex cavity profiles), the air outlet of the bellows can be customized into corresponding shapes to ensure uniform cooling and reduce defects such as bending and twisting of the profiles.

3、 Surface treatment process: Ventilation of oxidation tank and air supply for drying

The surface treatment of aluminum profiles (oxidation, electrophoresis, spraying) directly affects the corrosion resistance and aesthetics of the product. This process requires the treatment of acid and alkali mist and precise control of drying temperature.