Chapter 7 - Casting Process

7/22/2019 Chapter 7 - Casting Process

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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

JF302 – MATERIAL TECHNOLOGY 1CHAPTER 7: 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







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


















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







JF302 MATERIAL TECHNOLOGY 1CHAPTER 7 CASTING PROCESS







JF302 MATERIAL TECHNOLOGY 1CHAPTER 7: CASTING PROCESS




PRESSUREDIE

CASTING





•

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








STEP 1

Molten metal is inserted into the chamber

STEPS PROCESSING








STEP 3

Core released and die manufacturers moving

back








STEPS PROCESSING







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Chapter 7 - Casting Process