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PROSES MANUFAKTUR

PROSES MANUFAKTURSand CastingDie CastingShell MoldingInjection MoldingForgingExtrusionRollingCoiningDrawingTurningDrillingMillingFlame CuttingReamingGrindingWeldingScrewRivetsPinsClipsKeysCASTING POCESSESCasting productsMetalDisk-BrakeTransmission HousingPlasticDigital CameraPolaroid Camera Case

1. SAND CASTINGMETAL CASTING POCESSESIlustrasi sand mold

- Complex internal cavities- Medium quantities of objects with complex external profiles

Sand CastingProduction Steps

1. SAND CASTING1.1 SandSilica sand (SiO2): - Inexpensive- High temperatures resisteance

Faktor-faktor penting pemilihan sand mold:- Sand having fine round grains forms a smooth surface- Good permeability gases and steam escape easily- Good collapsibility allow to shrink while coolingAdditives:- Clay: cohesive agent to bond sand particles- Zircon (ZrSiO4), Olivine (Mg2SiO4), Iron silicate (Fe2SiO4) sands: low thermal expansion- Chromite (FeCr2O4): high heat-transfer

1. SAND CASTING1.2 Pattern- One-piece patterns : simpler shapes and low-quantity production- Split Patterns : complicated shape

Characteristics of Pattern Materials

Beberapa Aspek Pembuatan Pattern- Metal Shrinkage- Metal flow- Pelepasan (removal)

1. SAND CASTING1.3 Cores

1. SAND CASTING1.4 Sand-Molding Machines - eliminate arduous labor- high-quality casting- increases production rate

1. SAND CASTING1.4 Sand-Casting Operation

Advantages and Limitations

Characteristics of Casting Processes

Surface Roughness