F - Extrusion and Shearing Flashcards
A manufacturing method that is used to produce long lengths of stock material. It is mainly performed on non-ferrous materials.
EXTRUSION
What material are the vast majority of EXTRUSIONS done on?
Aluminum Alloys
A hydraulic ram pushes on the billet from the rear. Since the billet is constrained by an enclosing container (cylinder) its only exit is via a die at the front, which can be any shape.
DIRECT EXTRUSION
Utilizes a container with a solid back end. The die is pushed back into the container by forces applied at the front.
INDIRECT EXTRUSION
A solid circular bar stock of around 2 feet in length.
BILLET
How are SOLID EXTRUSIONS of standard cross-sections usually created?
DIRECT EXTRUSION
A solid extrusion, but hollow; more complex
HOLLOW EXTRUSION
Another word for final shape
PROFILE
A type of hollow extrusion with a round or square cross-section.
EXTRUDED TUBE STOCK
A mandrel must be suspended in the die opening in order to extrude hollow parts. The shape and position of the mandrel will correspond to the hole running through the extruded part.
MANDREL
Thin “webs” bridge the gap between the die walls and the mandrel.
SPIDER DIE
They divide the main metal flow into separate streams through “porthole” openings in the die, before recombining them as they flow past the mandrel.
PORTHOLE DIE
Extrusions made with multiple cells or holes.
MULTI-CELLED EXTRUSIONS
A process that allows the extrusion of steel at temperatures above the recrystallization point. These temps are needed to convert from cast to wrought structure.
HOT EXTRUSION
What are other EXTRUSION PROCESSES used to create discrete components instead of long-length products?
COLD EXTRUSION and IMPACT EXTRUSION
A die is used to extrude the metal up the outside of a descending punch. it always stays constrained within the die.
COLD EXTRUSION
A die is used to extrude the metal up the outside of a descending punch. the metal hugs the punch as it rises unrestrained above the confines of the die.
IMPACT EXTRUSION
A process used to create very long lengths of product with a small diameter. The diameter of the wire rod is reduced through a series of dies.
WIRE DRAWING
A process to cut large pieces of material into more manageable-sized pieces. Uses a fracturing approach where bending stresses are induced and raised to the point of metal failure.
SHEARING
occurs at the upper edge as a result of plastic (permanent) deformation.
ROLLOVER/DROOP
The ugliest portion of the cut. It has a rough crystalline appearance and dominates the sheared face.
SLIP PLANE
is present at the lower edge which represents a hazard during handling since it can be jagged and sharp.
BURR
A secondary process used to clean up the edge that has been sheared.
SHAVING
A method of SHEARING that applies to cutting around an enclosed shape, such as a hole.
PUNCHING
