The aluminum alloy extrusion process actually begins with the product design, because the product design is based on the given usage requirements, which determine many final parameters of the product.Such as the product's mechanical processing performance, surface treatment performance and the use of environmental requirements, these properties and requirements actually determine the choice of extruded aluminum alloy.

However, the properties of extruded aluminum are determined by the design shape of the product.The shape of the product determines the shape of the extrusion die.

Once solved the design problem, the practical extrusion process is starting extrusion cast in aluminum rod, aluminum casting rod must be heated before extrusion to soften it, the heating good aluminum casting rods sheng ingot is put in the extruder barrel inside, and then by high power hydraulic cylinder pushing extrusion rod, the front end of the extrusion rod has a pressure pad, such heated soft aluminum alloy in dummy block under strong pressure from mold precision molding extrusion molding.

This is what a mold is for: the shape of the product needed for production.

The picture is: typical horizontal hydraulic extruder schematic diagram

The direction of extrusion is left to right

This is a simple description of the most widely used direct extrusion today. Indirect extrusion is a similar process, but there are some very important differences.

In the indirect extrusion process.The die is installed on the hollow extrusion bar, so that the die is pressed towards the immovable aluminum bar blank, forcing the aluminum alloy to extrude towards the hollow extrusion bar through the die.

In fact, the extrusion process is similar to squeezing the toothpaste. When the pressure is applied to the closed end of the toothpaste, the cylindrical toothpaste is squeezed through the circular opening.

If the opening is flat, the squeezed toothpaste comes out as a ribbon.

Of course, complex shapes can also be squeezed out at openings of the same shape.For example, cake makers use specially shaped tubes to squeeze ice cream to make all kinds of frills.

While you can't make many useful products with toothpaste or ice cream, you can't squeeze aluminum into tubes with your fingers.

But you can use a powerful hydraulic press to extrude aluminum from a given shape of mold to produce a wide variety of useful products of almost any shape.

The figure below (left) shows the first section of the extruder at the beginning of extrusion. (right)

The bar

The aluminum bar is the blank of the extrusion process. The aluminum bar used for extrusion can be solid or hollow, usually cylindrical, and its length is determined by the extrusion tube.

Aluminum rods are usually formed by casting, or by forging or powder forging.It is usually made by sawing aluminum alloy bars with good alloy composition.

Aluminum alloys are usually made up of more than one metal element. Extruded aluminum alloys are made up of trace (usually no more than 5%) elements (such as copper, magnesium, silicon, manganese, or zinc) that improve the properties of pure aluminum and affect the extrusion process.

The length of aluminum rod varies from manufacturer to manufacturer, which is determined by the final required length, extrusion ratio, discharge length and extrusion allowance.

Standard lengths generally range from 26 inches (660mm) to 72 inches (1830mm). Outside diameters range from 3 inches (76mm) to 33 inches (838mm), 6 inches (155 mm) to 9 inches (228 mm).

Direct extrusion process

[billet] [heating furnance] [extrusion press with die] saw [strecher] [aging overn]

The diagram illustrates the basic steps of extruding an aluminum bar