In the following content, we will explain the forward and reverse extrusion methods in aluminum profile extrusion, and discuss the differences between these two extrusion methods for aluminum profiles.
Forward extrusion
The extrusion method classified by direction is mainly based on whether the direction of the extrusion axis is opposite or the same as the direction of the aluminum product movement. If the direction is the same, it indicates that it is a forward extrusion of the aluminum profile.
Positive extrusion is an appropriate basic method. Due to its simple operation, strong flexibility, and smooth extrusion surface, it is more skilled and widely used in the forming and processing of aluminum and aluminum alloy materials.
Attention should be paid to the need for forward extrusion: there may be significant sliding conflicts between the aluminum profile blank and the extrusion cylinder during extrusion, which is not conducive to aluminum product extrusion in most cases. This can cause unstable movement speed of the aluminum product, resulting in uneven stress on various parts of the aluminum product, ultimately resulting in uneven quality of the extruded aluminum profile product; And under the influence of conflict alone, the energy consumed by the machine has increased by as much as 30% -40%; Due to intense conflicts that generate heat, the relative speed between aluminum extrusion and the mold wall will increase, and the cost of the mold will also increase, resulting in a corresponding reduction in lifespan.
Reverse extrusion
If the direction of movement of aluminum products is opposite to that of the extrusion axis, it is called reverse extrusion.
The reverse extrusion method of aluminum profiles is mainly used for cold extrusion forming of various aluminum alloy die-casting; And the hot extrusion forming of pipes and profiles such as aluminum alloy round pipes, among which high-strength aluminum alloys are relatively more commonly used. There is no need for relative sliding between the metal blank and the extrusion cylinder wall during reverse extrusion, and the required extrusion pressure and energy consumption are relatively low. Therefore, on the same level of equipment, reverse extrusion can cause greater fluctuations in the deformation of aluminum profiles or alloys with higher extrusion deformation resistance.
Unlike forward extrusion in aluminum profile processing, the operation of reverse extrusion skills is relatively messy, and the gap time is checked for long extrusion. Therefore, it is difficult to control the quality of the appearance of aluminum products during reverse extrusion. It is necessary to use specialized extrusion tools and equipment, and the use of reverse extrusion is subject to certain limitations. In recent years, with the successful development of specialized reverse extrusion machines and the development of tooling skills, the skills of aluminum alloy reverse extrusion will be increasingly applied.
