Summary of "Extrusion Processes: Direct Extrusion, Indirect Extrusion Process Working Animation | Shubham Kola"

Main ideas / concepts

Extrusion is a metal forming process where a metal billet (raw metal) is shaped by being forced through a die with an opening.
The process uses an extrusion container with:
- A die mounted at one end (at the container’s end).
- A hydraulically driven ram that applies pressure to the billet.

A billet is placed into the container of the extrusion press.
When the hydraulic ram moves forward, it presses the billet.
The billet flows through the die opening, creating an extruded product with the required cross-sectional shape.

Flow direction: Extruded metal flows in the same direction as the ram motion.
Common name: Forward extrusion
Force requirement: Higher (more force is required to push/release the billet from the extruder).
Friction: High frictional force because the billet must travel through the entire length of the container.
Material wastage: More compared to indirect extrusion.

Flow direction: Extruded metal flows opposite to the ram motion.
Common name: Backward extrusion
Force requirement: Lower because there is no friction between the billet and the inside walls of the container (as described).
Material wastage: Less compared to direct extrusion.

Direct extrusion
- Metal billet flows with ram direction.
- Term: forward extrusion
- Higher required force
- Higher friction (billet travels full container length)
- More material wastage
Indirect extrusion
- Metal billet/metal flows against ram direction.
- Term: backward extrusion
- Lower required force
- Lower friction (no friction between billet and container walls, per subtitles)
- Less material wastage