EMAE 160 – PARTS EXAM QUESTIONS
WITH CORRECT ANSWERS
Ram EDM - ANSWER-Electric discharge machining. complicated part is die cast
mold aluminium, zinc, magnesium, little circles on back side from ejector pins,
smooth surface finish, get shape from electrical discharge (sparks)
Die cast - ANSWER-parting line, circles on back, zinc or aluminum, hot or cold
chamber
Transfer molding - ANSWER-plastic w/ metal insert, usually thermoset plastc
wire EDM - ANSWER-punch in die, little hole for wire cut
blow molding - ANSWER-water bottle, hollow plastic parts
impact extrusion - ANSWER-soda can, little disc extruded to make can
upset forging - ANSWER-roundvar stock fed in, last thing is thread rolling, cold
heading, screws, bolts, fastners, most popular, increase diameter by compressing
length
metal machining - ANSWER-straight up from bar stock, no parting line, possible
surface finish, cicular marks from lathe
hydroform - ANSWER-copper fitting, start with round tubing put in between 2 discs,
stretch metal to take form of die, round to rectangular, hydraulics
plastic extrusion - ANSWER-consisten cross section, straws, pens
aluminium extrusion - ANSWER-consistent cross section, can extrude any metal,
just pull the metal, however aluminium most common
plastic injection - ANSWER-like die cast, little circles from ejector pins, thermoplastic
more common, little parting line on side, injection molding for plastics
Soldered/brazed - ANSWER-metal joining with filler metal - capillary action
Sand casting - ANSWER-Parting line, rough surface finish, see draft on side,
common materials: aluminium, cast iron
Impression die forging - ANSWER-wrench, want flash, thick parting line
Investment casting - ANSWER-smoothe surface finish, detail, high melting temp, no
parting line, wax piece is made from mold, jewelery, teeth
powder metallurgy - ANSWER-bronze bushing, short and squat, carbide tips, one to
one ratio of diameter to height
WITH CORRECT ANSWERS
Ram EDM - ANSWER-Electric discharge machining. complicated part is die cast
mold aluminium, zinc, magnesium, little circles on back side from ejector pins,
smooth surface finish, get shape from electrical discharge (sparks)
Die cast - ANSWER-parting line, circles on back, zinc or aluminum, hot or cold
chamber
Transfer molding - ANSWER-plastic w/ metal insert, usually thermoset plastc
wire EDM - ANSWER-punch in die, little hole for wire cut
blow molding - ANSWER-water bottle, hollow plastic parts
impact extrusion - ANSWER-soda can, little disc extruded to make can
upset forging - ANSWER-roundvar stock fed in, last thing is thread rolling, cold
heading, screws, bolts, fastners, most popular, increase diameter by compressing
length
metal machining - ANSWER-straight up from bar stock, no parting line, possible
surface finish, cicular marks from lathe
hydroform - ANSWER-copper fitting, start with round tubing put in between 2 discs,
stretch metal to take form of die, round to rectangular, hydraulics
plastic extrusion - ANSWER-consisten cross section, straws, pens
aluminium extrusion - ANSWER-consistent cross section, can extrude any metal,
just pull the metal, however aluminium most common
plastic injection - ANSWER-like die cast, little circles from ejector pins, thermoplastic
more common, little parting line on side, injection molding for plastics
Soldered/brazed - ANSWER-metal joining with filler metal - capillary action
Sand casting - ANSWER-Parting line, rough surface finish, see draft on side,
common materials: aluminium, cast iron
Impression die forging - ANSWER-wrench, want flash, thick parting line
Investment casting - ANSWER-smoothe surface finish, detail, high melting temp, no
parting line, wax piece is made from mold, jewelery, teeth
powder metallurgy - ANSWER-bronze bushing, short and squat, carbide tips, one to
one ratio of diameter to height
