[Chinese aluminum industry network] Extrusion ratio Extrusionratio Extrusion ratio of aluminum extrusion formula is the parameter used to describe the aluminum alloy deformation amount in aluminum extrusion production. It is also called extrusion coefficient. It means: Extrusion extrusion ratio extrusionRatio The formula for the extrusion ratio of aluminum is the parameter used to express the deformation of aluminum alloy in the extrusion production of aluminum. It is also called the extrusion coefficient. It indicates: the total cross-sectional area of ​​the product before extrusion mm2/extruded product The total cross-sectional area mm2. Therefore, the extrusion ratio has the following relationship with the degree of deformation:
1. When the other conditions are the same, when the extrusion ratio increases, the difficulty of the metal flowing out of the die hole increases, and the pressing force also increases.
2. When the other conditions are the same, the extrusion ratio increases, and the resistance of the outer layer metal of the billet to the die hole increases during the extrusion, so that the difference in the flow speed of the inner and outer metal increases and the deformation is not uniform.
3. When the extrusion ratio increases to a certain degree, the shear deformation penetrates deep into the interior, and the deformation begins to change in a uniform direction. Studies have shown that when the extrusion is deformed. When 85% to 90% is reached, the extruded metal flows evenly, and the mechanical properties of the inner and outer layers of the product also tend to be uniform. The choice of extrusion ratio is related to the type of alloy, extrusion method, product properties, extruder capacity, inner diameter of the barrel, and billet length.
If the value is chosen to be too large, the extrusion machine will suffer from "stingy car" due to excessive extrusion force, which will prevent the extrusion process from proceeding normally, or even damage the tool and affect productivity.
If the value is selected to be too small, the capacity of the extrusion equipment cannot be fully utilized, and it is also not conducive to obtaining a product having uniform structure and performance.
The extrusion ratio should generally meet the following requirements:
Bars and profiles extruded once: 8 to 12
Rolling, Drawing, Forging Blanks: 5
No limitation for blanks for secondary extrusion
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