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CASTING (CASTING DEFECTS (COLD SHEET (RAPIDLY SOLIDIFY), MISSEES…
CASTING
CASTING DEFECTS
COLD SHEET
RAPIDLY SOLIDIFY
MISSEES
DIFFERENCE IN SOLIDIFICATION
BLOW HOLES
FORMATION OF BLISTERS
HOT TEARS
EXTRA MATERIAL FLOW OUT
SAND INLCLUSION
DROP
IRREGULAR PROJECTION
BUCKLING
GAMMA SHAPE DEPRESSION
LIQUID METAL DISPLACE THE SAND
MOULD SHIFT
MISALIGNMENT OF TWO HALVES
OLDEST METHOD
WIDELY USED
VOL. OF RISER=3*VOL. OF SHRINKAGE
STRAINER -REMOVE DROSS
RISER
PREVENT SHRINKAGE ASOLIDIFICATION
RESERVOIR
PTR
CHAPLET
TO SUPPORT CORE
CHILL
INCREASE COOLING RATE
PADDING
CONTROL COOLING OF CRITICAL SECTION
BENCH MOULDING
SMALL PARTS
PIT MOLUDING
HEAVY PARTS
SAND
GREEN
6-10% MOISTURE
TEMPERED SAND
PARTING
CONSIST OF SILICA SAND
FACING
USED FOR FACING THE MOULD
DRY
MIXTURE OF 50%SAND+50% CLAY
SHRINKAGE
THERMAL EXPANSION
CAUSE DIMENSIONAL CHANGE
GREY CAST IRON IS GIVEN NEGITIVE SHRINKAGE ALLOWANCE AS IT EXPAND
investment casting
BETTER TOLERANCE
EXCELLENT SURFACE FINIDH
SLUSH CASTIN
JWELLERY , ORNAMENTS
DIE CASTING-GRAVITY DIE CASTING
PERMANENT CASTING