What Is Aluminum Extrusion?
The extrusion method forces aluminum alloy material into a die with a specific cross-sectional form. The metal is pushed through the die and out of the die aperture by a powerful ram. When this occurs, it emerges in the precise shape of the die and is carried away along a runout table.
Fundamentally speaking, the procedure is a really simple approach. The same amount of force is used when you squeeze a tube of toothpaste in your hands. When you press the toothpaste tube, it emerges in the form of an opening. The toothpaste tube's aperture serves a similar function to an extrusion die.
Aluminum Extrusion Process:
Step 1- Formulate the Extrusion Die
The first step is to manufacture a die with a circular form. On the other hand, you may use one that is already out there. Pre-heat the die to between 450 and 500 0C before the extrusion procedure. This optimizes the life of the die and guarantees uniform metal flow. After the preheating procedure, you may feed the die into the extrusion press.
Step 2: - Warm up the aluminum sheet
The next process is to slice the billet, a long, coiled piece of aluminum alloy material, from the material log. Finally, preheat the oven to between 400 and 500 0C. The procedure may be completed with the billet's malleability increased by this method. Also, it makes sure it is not molten.
Step 3- Relocating the Billet to the Extrusion Press
Transfer the billet mechanically into the press after preheating it. But before you pour it into the press, be sure to apply a lubricant. Include the extrusion ram in the application of the releasing agent. The ram and billet won't stick together as a result of this procedure.
Step 4- Fill the Extrusion Press Container with Billet Material
The malleable billet is now in the extrusion press at this time. Here, the hydraulic ram has a pressure capacity of around 15,000 tons. The malleable billet is forced into the container by pressure. Then, the metal components grow to fill the container's walls.
Step 5- Push the material that was extruded up against the die
Now that the container's wall is filled with aluminum material, it is forced up against the extrusion die. At this moment, the material is continuously under pressure. The only way it can move is via the die-holes. It comes out of the die's apertures with a precisely formed shape.
Step 6- Quench the Extrusions
After the extrusion has emerged, a puller keeps it in position. As it comes out of the press, the puller shields it. A fan or water bath is used to evenly cool the profile as the alloy travels around the table. "Quenching" describes this procedure.
Step 7- Table-lengthen the extrusions
Use a hot saw to shear the extrusion as soon as it reaches the entire length of the table. During the whole extrusion process, the temperature is crucial. The extrusion has not attained full cooling even though it was quenched after leaving the press.
Step 8- Cool Extrusions to Room Temperature
The extrusions are transported from the runout table to a cooling plain after the shearing process. Once they reach room temperature, the profiles remain there. Stretching begins when they reach room temperature.
Step 9- Transfer Extrusions to the Stretcher and Align Them
At this point, you'll probably notice some twists in the forms, which you need to fix. It would be best if you had a stretcher in order to repair this. Pull each profile mechanically until it is completely straight by holding it at both ends. This approach specifies them.
Step 10- Extrusions are moved to the finish saw and cut to length
You may now move the extrusions to a saw table as they are straight and work-hardened. You may cut them into particular lengths, often between 8 and 21 feet. When the sawing operation is complete, you may put them in an oven to age to the proper heat.
Step 11- Execute supporting actions (Heat treatment, Fabrication, and Surface Finishing)
Profiles may be heated after the extrusion process is finished to improve their characteristics. If it's necessary to alter their proportions, fabrication comes next following the heat treatment. Their look and corrosion resistance are now improved by adding a surface finish.
Producing items with unique cross-sectional profiles requires the aluminum extrusion process. It's a fascinating method that yields a variety of product forms that you may heat treat, construct, and polish to your specifications ordered from an Aluminum extrusion machine supplier.
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