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Indirect hollow extrusion

Extrusion process in which a moving chamber pushes an ingot on a stationary die for creating a hollow component.

Illustration of Indirect hollow extrusion

The process

The working material consists of a preheated ingots [1] placed in a pressure chamber [2]. The chamber is pushed against a stationary piston [3] with a die [4] mounted on the end and is pressed against the ingot with an applied pressing force which forces the ingot past the die to the side opposite to the pressing force. The ingot then assumes the same form as the die and pressure chamber cross section and pushed out as a hollow axially symmetric profile [5]

Since the ingot moves together with the pressure chamber avoids frictional forces there between.