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CastingCastingManufacturing ProcessesManufacturing Processes
© 2012 Su-Jin Kim GNU© 2012 Su-Jin Kim GNU
Expendable Mold CastingProcess ( 소모성 주형 주조 공정 )
1. Sand casting2. Shell mold casting3. Plaster mold casting4. Investment casting (lost wax casting)5. Lost foam casting
CastingCastingManufacturing ProcessesManufacturing Processes
© 2012 Su-Jin Kim GNU© 2012 Su-Jin Kim GNU
Sand casting ( 사형주조 )
CastingCastingManufacturing ProcessesManufacturing Processes
© 2012 Su-Jin Kim GNU© 2012 Su-Jin Kim GNU
Sand casting
http://www.youtube.com/watch?v=rgL2Jn5mk1A Manualhttp://ma.gnu.ac.kr/vod/casting/casting_tap.wmv Tap
• Use expendable sand molds• Low production rate(1–20 pieces/hour-mold)• Low cost, Recycle sand• Small quantity production• Complex entire parts at one time
CastingCastingManufacturing ProcessesManufacturing Processes
© 2012 Su-Jin Kim GNU© 2012 Su-Jin Kim GNU
Shell mold casting ( 셸주조 )
• Fine sand mixed with a resin is heated by the pattern and hardened into a shell around the pattern
• Can produce castings with close dimensional tolerances, good surface finish and low cost.
CastingCastingManufacturing ProcessesManufacturing Processes
© 2012 Su-Jin Kim GNU© 2012 Su-Jin Kim GNU
Plaster mold casting ( 석고주형 주조 ) • Plaster is mixed with water and poured over the
pattern.• Accurate, good surface and low melting point alloy
http://www.youtube.com/watch?v=xPSI1wUOBnk&p=9B6D9EAE75875D9D
CastingCastingManufacturing ProcessesManufacturing Processes
© 2012 Su-Jin Kim GNU© 2012 Su-Jin Kim GNU
Investment casting ( 인베스트먼트 주조 , lost wax casting)• A wax pattern is coated by ceramic slurry that hardens
into the mold.• One pattern creates one part, which increases
production time and labor costs.• Complex geometries, good surface and high melting
point alloy.
SME: http://www.youtube.com/watch?v=PIneaDTZ16g
CastingCastingManufacturing ProcessesManufacturing Processes
© 2012 Su-Jin Kim GNU© 2012 Su-Jin Kim GNU
Investment casting (lost wax casting)• Wax pattern Mold Pouring
Coin: http://www.youtube.com/watch?v=4Yvm6fUXf1UAerospace: http://www.youtube.com/watch?v=f7FXtnXVqzY
CastingCastingManufacturing ProcessesManufacturing Processes
© 2012 Su-Jin Kim GNU© 2012 Su-Jin Kim GNU
Lost foam casting ( 소실모형주조 )
• Polystyrene patterns evaporate with molten metal to form a cavity for the casting.
Molding ( 금형 ) Patterns
Compact in sand
Coating
Casting Shakeout Manhole cover
©samhwacast.com
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