Continuous hot extrusion with a stationary valve

The novel continuous extrusion process was invented to enable constant material flow at the die exit during the dead cycle time and to reduce scrap. The process is a combination of direct and indirect hot extrusion with a stationary valve. The challenge is the design of the valve and related parameters to ensure a constant profile speed. Model experiments of continuous extrusion show the unique distribution of material in the profile. The functionality of the valve is demonstrated experimentally with aluminium. Compared to conventional extrusion, the weld strength can be doubled, while the ram forces are increased by 70%.