The extrusion process of aluminum alloy is actually started from the product design,because the design of the product is based on the given use requirements,and the requirements of use determine many final parameters of the product.
These properties and requirements actually determine the choice of extruded aluminum alloy type, such as the machinability, surface treatment properties,and environmental requirements of the product.The performance of the aluminum profile extruded from the same aluminum alloy depends on the design shape of the product.The shape of the product determines the shape of the extrusion die.
Once the design problem is solved,the actual extrusion process starts from the aluminum cast rod for extrusion. The aluminum cast rod must be heated to soften it before extrusion. The heated aluminum cast rod is placed in the extruder. Inside the cylinder, then the squeeze rod is pushed by a high-power hydraulic cylinder.The front end of the extrusion rod has a pressing pad, so that the heated and softened aluminum alloy is extruded from the precision forming hole of the mold under the strong pressure of the pressing pad.This is the role of the mold: the shape of the product needed for production.
Figure 1:Typical horizontal hydraulic extruder
This is a simple description of the most widely used direct extrusion. Indirect extrusion is a similar process, but there are some very important differences. In the direct extrusion process, the mold is not moving and is pushed by the pressure of the extrusion rod. The aluminum alloy passes through the die hole.
In the indirect extrusion process, the mold is mounted on a hollow extrusion rod, which causes the mold to be pressed against the stationary aluminum rod blank, forcing the aluminum alloy to be extruded through the mold to the hollow extrusion rod.
In fact, the extrusion process is similar to squeezing toothpaste. When pressure is applied to the closed end of the pressure, the cylindrical toothpaste is squeezed out from the circular opening. Although you can not squeeze the aluminum alloy into aluminum tube with your fingers, you It can rely on high-power hydraulic press to squeeze aluminum alloy from a certain shape of the die hole to produce a wide variety of products in various shapes.