Permanent mold casting is used primarily for medium to high production, although the process is sometimes used advantageously for low production. Cost per casting or per Kilo invariably decreases as quantity increases.
Costs for producing a 0.92lb aluminum alloy 319 casting in quantities of 100, 500, 1000 and 10,000 are itemised in the bgelow table. Costs per casting metal, degating and grinding remained the same regardless of quantity, but other unit costs gradually decreased as quantity increased. The decease in cost per casting as well as cost per KILO is approximately 30% as quantity increased from 100 to 10,000 castings.
|ITEM||EXAMPLE A||EXAMPLE B|
|Weight of Casting kg||2.30kg||
|Number of Casting per Mold||1||1|
|Weight of Castings per Mold||2.30kg||2.72kg|
|Gross Weight of Metal Poured per Mold||6.7kg||3.17kg|
|Ideal Yield %||34||86|
|Actual Yield %||31||83|
|Number of Cores per Casting||None||1|
|Method of Mold Operation||Machine||Manual|