EMAE 160 RVW 2 COMPLETE
ANSWERS
What is the difference between green-sand cores and dry-sand cores? - ANSWER-
green sand = uses wet sand to make mold dry sand = formed independently of mold
and held by core prints
What is the shell molding pattern made of? Why? - ANSWER-Metal (iron or steel
normally). So the metal can be heated and will partially cure the sand to make the
mold.
Die cast parts are ejected by? - ANSWER-ejector pins
Metals die cast in a cold chamber include: - ANSWER-Aluminium, Magnesium, and
Copper
Metals die case in a hot chamber include: - ANSWER-Zinc, Tin, and Lead.
What is a sprue? - - ANSWER-a hole in mold which liquid material enters the mold
What is a riser? - ANSWER-a reservoir built into mold to prevent cavities due to
shrinkage
What is a runner? - ANSWER-a channel for liquid to get into the mold
What is a gate? - ANSWER-place(s) where liquid material enters the casting
Centrifugal vs. Semi-centrifugal casting? - ANSWER-The manufacturing process of
both metal casting techniques uses the forces generated by centripetal acceleration
to distribute the molten material in the mold. The main difference is that in semi-
centrifugal casting the mold is filled completely with molten metal.
In sand casting, how does the volumetric size of the pattern compare to the finished
cast part. - ANSWER-It is larger.
Describe shell molding. - ANSWER-It is a mold casting process that uses a resin
covered sand to form the mold.
Name another term for investment casting and explain the origin. - ANSWER-Lost
wax casting. It was used 1000s of years ago: beeswax was the pattern and sand the
mold. Made idols, ornaments, jewlery
List the metals that are typically die cast. - ANSWER-zinc, lead, tin, aluminum,
magnesium, and copper.
In terms of die casting, what is a flash? - ANSWER-excess material attached to a
cast product caused by leakage of material beginning along parting line.
ANSWERS
What is the difference between green-sand cores and dry-sand cores? - ANSWER-
green sand = uses wet sand to make mold dry sand = formed independently of mold
and held by core prints
What is the shell molding pattern made of? Why? - ANSWER-Metal (iron or steel
normally). So the metal can be heated and will partially cure the sand to make the
mold.
Die cast parts are ejected by? - ANSWER-ejector pins
Metals die cast in a cold chamber include: - ANSWER-Aluminium, Magnesium, and
Copper
Metals die case in a hot chamber include: - ANSWER-Zinc, Tin, and Lead.
What is a sprue? - - ANSWER-a hole in mold which liquid material enters the mold
What is a riser? - ANSWER-a reservoir built into mold to prevent cavities due to
shrinkage
What is a runner? - ANSWER-a channel for liquid to get into the mold
What is a gate? - ANSWER-place(s) where liquid material enters the casting
Centrifugal vs. Semi-centrifugal casting? - ANSWER-The manufacturing process of
both metal casting techniques uses the forces generated by centripetal acceleration
to distribute the molten material in the mold. The main difference is that in semi-
centrifugal casting the mold is filled completely with molten metal.
In sand casting, how does the volumetric size of the pattern compare to the finished
cast part. - ANSWER-It is larger.
Describe shell molding. - ANSWER-It is a mold casting process that uses a resin
covered sand to form the mold.
Name another term for investment casting and explain the origin. - ANSWER-Lost
wax casting. It was used 1000s of years ago: beeswax was the pattern and sand the
mold. Made idols, ornaments, jewlery
List the metals that are typically die cast. - ANSWER-zinc, lead, tin, aluminum,
magnesium, and copper.
In terms of die casting, what is a flash? - ANSWER-excess material attached to a
cast product caused by leakage of material beginning along parting line.
