FLASHING FINNING
EXCEEDED RECOMMENDED | REDUCE WATER TO WITHIN RECOMMEND RANGE (38 – 40/100) |
| NOT MIXED LONG ENOUGH | HAND MIXING – MIX 3 MIN. MECHANICAL – MIX 3 – 4 MIN. |
| METAL AND, OR FLASK TEMP TOO HOT | REDUCE METAL AND, OR FLASK TEMPERATURES |
| CURE TIME NOT LONG ENOUGH AFTER SET | LEAVE FLASK UNDISTURBED 1 – 2 HOURS BEFORE STARTING BURNOUT |
| INVESTMENT PROCESSED PAST AVAILABLE WORKING TIME | PROCESS NOT LONGER THAN 8 – 9 MIN. |
| MOLD HEATED TOO QUICKLY WATER / POWDER RATIO | SLOW DOWN RATE OF TEMPERATURE RISE |
| EXPIRED INVESTMENT IMPROPER STORAGE | REDUCE METAL AND, OR FLASK TEMPERATURES |
AIR BUBBLES
WATER RATIO TOO LOW | ADJUST W/P RATIO TO: 38/100- VACUUM MIXING -40/100- HAND, MECHANICAL MIXING |
| NOT MIXED LONG ENOUGH WATER / POWDER RATIO | DO NOT MIX LESS THAN 2.5 – 3 MINUTES |
| INVESTING CYCLE TOO LONG | FOLLOW INSTRUCTIONS DO NOT PROCESS PAST 9 MINUTES |
NON-FILLS
METAL &, OR FLASK TEMP. | ADUST METAL AND OR, FLASK TEMP. HIGHER |
NON-FILLS, Cont.
|
FLASK TEMP. TOO LOW |
RAISE FURNACE TEMP. UNTIL COMPLETE FILLS ARE ACHIEVED |
| NOT ENOUGHE G-FORCE (Casting with Centrifuge) | ADJUST CENTRIFUGE TO INCREASE G-FORCE |
| INSUFFICIENT VACUUM PRESSURE / LEAK IN VACUUM SYSTEM | ADJUST VACUUM REPAIR LEAK IN SYSTEM |
| INCOMPLETE BURNOUT – TOO MUCH CARBON PRESENT IN MOLD CAVITY | INCREASE TIME AT PEAK TEMP. UNTIL MOLD CAVITY IS WHITE |
SHRINKAGE POROSITY
PATTERNS TOO CLOSE TO | LEAVE MORE SPACE BETWEEN BOTTOM ROW AND BUTTON |
| FLASK TEMP. TOO HIGH | REDUCE FLASK TEMPERATURE |
| SPRUED IMPROPERLY | SPRUE TO THICKER SECTION OF DESIGN |
| SPRUING TOO SMALL | SPRUE TO HEAVIEST SECTION OF DESIGN. USE LARGER GATE |
GAS POROSITY
CONTAMINATED METAL | CLEAN METAL OF INVESTMENT, ETC. |
| FLASK TEMP. TOO HOT | REDUCE FLASK TEMPERATUR |
| INCOMPLETE BURNOUT | HOLD LONGER AT PEAK TEMP. |
| METAL REUSED TOO MANY TIMES | USE NEW, UNUSED METAL, OR MIX NEW METAL WITH REMELT |
INVESTMENT RESIDUE STICKS TO CASTINGS
METAL OVERHEATED | REDUCE METAL TEMPERATURE |
CASTING INCLUSIONS
CRUCIBLE OLD, DETERIORATED | REPLACE WITH NEW CRUCIBLE REFINE METAL |
CASTING INCLUSIONS, Cont.
SHARP CORNERS BREAKING OFF | INCREASE MOLD STRENGTH MODIFY DESIGN |
ROUGH CASTING SURFACE
TOO MUCH WATER USED | DO NOT EXCEED 40% WATER FOR MIXING. |
| ROUGH MODEL SURFACE | POLISH MASTER MODEL & REMAKE RUBBER MOLD |
| TOO MUCH SILICONE. OR TALC MOLD RELEASE | CLEAN MOLD AND REDUCE SILICONE, OR TALC USED |
| FLASK TOO HOT | REDUCE FLASK TEMP. |
| METAL TOO HOT | REDUCE METAL TEMP. |
| EXCESS STEAM DE-WAX | REDUCE TIME IN STEAM TO LESS THAN ONE HOUR |
| FLASK NOT CURED LONG ENOUGH BEFORE BURNOUT | CURE MOLD A MINIMUM OF 1- 2 HOURS |
DARK, OXIDISED CASTINGS
PEAK BURNOUT TEMP. | DO NOT EXCEED 750C. |
| METAL SPENT, REUSED TOO MANY TIMES | REFINE, USE FRESH METAL |
| METAL OVERHEATED | USE CORRECT TEMP. FOR CASTING |