EMAE 160 RVW 2 COMPLETE
ANSWERS
Describe a draft? - ANSWER-it is the amount of taper for molded or cast parts
perpendicular to parting line; by tapering the sides of a mold by an appropriate "draft
angle", the mold will be easier to remove
What is a core used for? and what do core prints do? - ANSWER-used in casting
and molding to produce internal cavities and inward pointing angles in the molded
part. Core prints hold core in position.
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.
Explain how a match plate is used in sand casting and why it is advantageous. -
ANSWER-it is used by mounting two sides of the pattern onto match plate. It is
advantageous because it makes aligning pattern quicker/more accurate.
Explain the term parting line when referencing the die casting process. - ANSWER-It
is the line where the 2 halves of the die meet on the part
ANSWERS
Describe a draft? - ANSWER-it is the amount of taper for molded or cast parts
perpendicular to parting line; by tapering the sides of a mold by an appropriate "draft
angle", the mold will be easier to remove
What is a core used for? and what do core prints do? - ANSWER-used in casting
and molding to produce internal cavities and inward pointing angles in the molded
part. Core prints hold core in position.
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.
Explain how a match plate is used in sand casting and why it is advantageous. -
ANSWER-it is used by mounting two sides of the pattern onto match plate. It is
advantageous because it makes aligning pattern quicker/more accurate.
Explain the term parting line when referencing the die casting process. - ANSWER-It
is the line where the 2 halves of the die meet on the part
