D- Spin Casting and Orbital Forging Flashcards
What is a method used to make hollow castings without the need for a core?
CENTRIFUGAL/ SPIN CASTING
What is a dynamic casting process where one part of the die moves into another after the pour?
SQUEEZE CASTING
What is the process of a smooth metal mold being filled with molten metal. The metal solidifies first where it is in contact with the metal surface. The mold can be inverted to allow the central part of the melt to flow out.?
SLUSH CASTING
What is an ancient process that uses hammering (or pressing) to shape hot pliable metals.?
FORGING
All metal is initially purified and reduced to a molten state from ore, after which it is poured into a mold to become an
INGOT
What happens when a metal in an amorphous liquid state solidifies to a solid form?
It goes through a CRYSTALLIZATION PROCESS.
What are individual patches of crystallization?
GRAINS
What are lattice crosslinking that start from a large number of initiation sites within the liquid metal?
CRYSTALS
What is the structure created by forging at elevated temperatures creating microcracking called?
WROUGHT STRUCTURE
What is a concave-shaped process performed to move metal generally to more advantageous locations in preparation for use in a later process?
EDGING
What is a convex-shaped process performed to move metal generally to more advantageous locations in preparation for use in a later process?
FULLERING
What factors affect strength in forging?
WROUGHT STRUCTURE and GRAIN FLOW DIRECTION
How should GRAIN FLOW always flow?
Parallel to the boundaries of the part
What is the process where a hot pliable metal is forced to flow around inside a closed die cavity, where the grains are constrained to flow parallel with the boundaries?
CLOSED DIE FORGING
What are the two forms of FORGING machines?
PRESSES and HAMMERS.
What is the forging process where the dies are dovetailed into the base and of the machine, making die removal and replacement easy.
IMPRESSION DIE FORGING
What is the solution to the issue with IMPRESSION DIE FORGING?
Include a FLASH LAND and GUTTER which acts as an overflow system
What process creates surface designs (usually different) in relief (raised) on both sides.?
COINING
What process creates the same design on both sides, one in relief (raised) and the other in intaglio (indented)?
EMBOSSING
What process is a superior and more expensive method of heading which combines radial and circular motions of the upper punch, and results in a swirling grain flow that is always parallel to the boundaries?
ORBITAL FORGING
What is a process used to form the bolt head by deforming material radially outward?
HEADING
