Aluminum extrusion is the technique of forcing aluminum alloy material through a die having a predetermined cross-sectional profile.
Are you interested in knowing that how the process of aluminum extrusion is made? If yes, then continue reading.
Steel is used to create a round-shaped die. Alternatively, if one is already accessible, it is retrieved from a warehouse. To help maximize the life of the die and maintain even metal flow, it must be preheated to between 450 and 500 degrees Celsius before extrusion.
The die can then be moved into the extrusion press after it has been warmed.
A billet is a solid cylindrical block of aluminum alloy cut from a long log of alloy material. It is heated to 400-500 degrees Celsius in an oven. This makes it flexible but not molten enough for the extrusion procedure.
The billet is mechanically transported to the extrusion press once it has been warmed. A lubricant applies to it before it is loaded onto the press. To prevent the billet and ram from adhering together, the release agent is also applied to the extrusion ram.
A malleable billet is put into the extrusion press, where it is pushed to rates up to tons by a hydraulic ram. Then billet material is pushed into the extrusion press container as the ram applies pressure. The material extends to fill the container’s walls.
The alloy material is now being forced up against the extrusion die as it fills the container. The aluminum material has nowhere to go but can go out via the openings in the die when constant pressure applies to it. It emerges in the shape of a fully completed profile from the die’s opening.
A puller grips the extrusion and guides it along with the runout table at a speed that matches its exit from the press. The profile is quenched, or uniformly cooled as it goes along the runout table, using a water bath or fans above the table.
Extrusions are sheared by a hot saw as they reach their full-table length. Temperature plays an important role at every step. As for the extrusion, it was quenched after leaving the press, but it didn’t cool completely.
Extrusions are transferred mechanically to the cooling table from the runout table. Extrusion profiles will remain there until they reach room temperature. Once reached, they need to be stretched.
Some natural twisting occurs in the extrusion profiles, and that needs to be corrected. Moving to a stretcher will correct this. Each extrusion profile will be gripped from both ends and pulled until it gets straight.
As the extrusions are straight and hard, they are moved to the saw table. They saw to a pre-specified length.