Extrusion & Drawing Processes Quiz

A conventional extrusion process where a billet is pushed through a die by a hydraulic ram.

A less common extrusion process where the ram pushes the billet from behind, reducing friction and forces.

An extrusion process where the ram pushes the billet horizontally through a die, with the ram in a vertical position.

An extrusion process using hydraulic pressure to squeeze a small billet through a die from all sides, increasing its ductility.

A measure of reduction in billet size to extrusion size (typically 10 < R < 100).

The diameter of the smallest circle that encloses an extrusion shape.

A factor describing the complexity of an extruded shape.

The force needed to perform extrusion, influenced by material strength, temperature, extrusion ratio, and friction.

The movement of metal during extrusion, affecting final properties & quality, similar to incompressible fluid flow under high pressure.

A region of metal that doesn't flow effectively during extrusion through square dies, its size & shape is affected by friction and strength .

Common metals like aluminum, copper, magnesium, and steel are used in extrusion processes.

Extruded workpieces have a maximum practical length due to handling challenges.

Most extruded shapes need straightening, especially those with uneven areas or small sections, to improve form.

A common method for extrusion, which uses higher temperatures for increased metal ductility and reduced die wear, but requires less force.

A specialized process used to extrude shapes with internal cavities, where metal flows and re-welds around the die supports.

Lubrication is crucial in hot extrusion; prevents metal sticking to the cylinder and die, commonly glass for steel extrusions or jacketing(soft metal) for protection,.

A method of extrusion done at room temperature that leads to good grain flow and toughness due to strain hardening.

A process using high-velocity impact to form shapes like metal tubes, commonly used for aluminum, at high production rates.

Specialized die used in the welding-chamber process to form internal cavities in extruded shapes.

A metal shaping process that pulls metal through a die.

The force required to pull a metal through a die to reduce its cross-section.

A metal forming process that reduces or changes the cross-section of a metal by pulling it through a die.

A machine used for drawing metals, typically with a single die and a pulling mechanism.

A type of drawing machine with multiple dies that can produce long, finely drawn wire.

A metal forming process where metal is forced through a die to reduce its cross-section or change its shape.

The area within an extrusion chamber where the metal doesn't flow through the die.

The outer layer of metal that remains in the extrusion chamber, and is scrapped later.

Wire is mostly drawn cold

Processes used to create tubular shapes and hollow sections.

A tube-drawing method that doesn't use a mandrel, sacrificing internal diameter precision.

A metal forming process where a cylindrical billet is pushed through a die to create a final shape.

A metal forming process where a workpiece is compressed into a die to produce a desired shape.

A metal forming process used to reduce the thickness of a workpiece by passing it between rolls.

Both use a die, but extrusion uses compressive force, while drawing pulls the material through the die to reduce its cross-section.

A specialized die with internal supports for mandrels, used to create hollow extrusions.

A zone in the extrusion chamber where metal doesn't flow through the die, often at corners.

Glass used as a lubricant in hot steel extrusions, coating the die and the extrusion as it passes through.

Direct extrusion pushes the billet through the die, while reverse extrusion has the die move toward the stationary billet, reducing friction.

The straight wall in a drawing die, determining the drawn wire's size.

Extrusion ratio, die geometry, extrusion speed, and billet temperature all influence extrusion pressure.

Higher extrusion ratios increase deformation resistance and thus extrusion force.

Smaller die angles lead to more friction, increasing extrusion force.

Faster extrusion speeds increase temperature, lowering yield stress and potentially reducing extrusion force.

Higher billet temperature decreases deformation resistance, and thus reduces extrusion force.

A stripper plate removes extruded parts from the punch, preventing sticking.

Larger die angles restrict lubricant flow into the die.

Larger die angles lead to increased redundant work.

Large die angles can create a region of ineffective metal flow (dead metal zone).

Glass is a good hot extrusion lubricant but not for impression-die forging because of die pattern failure.

Spur and helical gears can't be made by drawing or extrusion. They require other processes.