chapter 7 - casting process
TRANSCRIPT
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• a method of producing a device or
component
• a production process in which the
materials needed, heated until molten
and then poured into molds and allowed
to solidify by cooling its own beforebeing released for the machine to be
cleaned or re-
• can be categorized according to how
filling molten metal into a mold and themold material types used
CASTING PROCESS
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- Sand must be able to meet four basicrequirements:
Refractory nature
To maintain shape when compacted in a mold
Permeability
Realibility
-Most of the casting operation using silica sand
(SiO2) and red sand
-It is unable to resist high temperatures, has a
range of sizes and a large range of grain shape
SAND MOLDING
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1. SAND mold - consisting of 85% silica sand, clay
8% and 7% water.
2. Mold box, a container used for making molds in
it. Box mold comprising mold box above (Cope)
and the mold box (Drag). It is made of wood or
metal.
3. PATTERN - is a model or replica products madeaccording to the original product in the form of
castings. Made of wood, metal, plastic, wax
and plaster.
4. CORE - to produce a mold cavity mold on theinside of casting products. Made of plaster,
metal or ceramic.
5. BELLOWS - used to produce wind to produce
grains of sand are on the ronggan mold ormold.
EQUIPMENT SAND CASTINGJF302 – MATERIAL TECHNOLOGY 1CHAPTER 7: CASTING PROCESS
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STEP 2
Pattern wax coated heat-resistant material is
placed into a container of metal mold
Melting material (material hardener and silica
sand) poured into a mold and allowed to harden
former in overall container mold for forming mold
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JF302 – MATERIAL TECHNOLOGY 1CHAPTER 7: CASTING PROCESS
PRESSUREDIE
CASTING
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•
for materials that have a low meltingtemperature
• carried out by means of injection of a liquid
metal into metal molds under pressure action
•
high pressure 0.7MPa - 700MPa used to forcemolten metal into the mold cavity
• higher cooling rate
• can produce a uniform crystal structure with
fine grain
PRESSURE DIE-CASTING
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STEP 1
Molten metal is inserted into the chamber
STEPS PROCESSING
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STEP 3
Core released and die manufacturers moving
back
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STEPS PROCESSING
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