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# How to Calculate the aluminum Extrusion Ratio of Extrusion Press?

• #### Index

• How to Calculate the aluminum Extrusion Ratio of Extrusion Press?
• ### How to Calculate the aluminum Extrusion Ratio of Extrusion Press?

The tonnage of the aluminum extrusion press represents the extrusion force of the extrusion press, so how to choose the tonnage of aluminum extrusion press means how to choose the extrusion force of extrusion press.
The shape, size and appearance quality of aluminum profiles are closely related to the quality of the extrusion press.
For understanding of the model systematically, extrusion capacity and grade of the extrusion press, how to determine the tonnage of the aluminum profiles extruder is also an aspect that aluminum profiles manufacturers must be considered when purchasing an extrusion press.
The first thing to consider is how large the tonnage of the extrusion press is.
When it comes to select the tonnage of the extrusion press, it is generally necessary to calculate the extrusion ratio of the extrusion press at very beginning.
The extrusion ratio is also called the extrusion coefficient, which refers to the ratio of the cross-sectional area of the extrusion container to the total cross-sectional area of aluminum profile. It is the main parameter used to measure the amount of deformation of aluminum alloy in the production of aluminum profiles, expressed by the following formula:
λ=Ft/ΣF1
Among them, Ft represents the cross-sectional area of aluminum billet after being filled in extrusion container, expressed in mm²;
ΣF1 represents the total cross-sectional area of the extruded profile, expressed in mm².
When extruding aluminum profiles, the amount of deformation of aluminum alloy can also be expressed by the degree of deformation: ε=λ-1
The extrusion ratio λ of the aluminum profile and aluminum billet in the first extrusion is greater than 8-12. There is no limit to the extrusion ratio of mill finish for secondary extrusion.
The method used to calculate the extrusion ratio above is simply the cross-sectional area of the container ÷ the cross-sectional area of the extruded profile, which can also be calculated in other ways, that is, the length of the container ÷ the length of aluminum billet for extrusion.
Before determining the tonnage of the extrusion press, it is necessary to understand the cross-sectional shape of the profile, so as to determine the size of the mold, and then determine the structure of the mold, so that it can be determined whether the extrusion is a hollow profile or a solid profile. The extrusion press tonnage required for these two different structural profiles will be different.