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Thursday, 24 April 2014

Core Mixtures

Core Mixtures Points : Core Mixtures, foundry Component is mixed to suit requirements of cores as resolute by alloy being cost with its temperature. The process of making core and some special necessities of the core depends upon the size and shape of casting. Easy core-sand mix usually used 1% sand 1% core oil, 1% cereal and 2.2 to 6.0 % water. The further combination for coring purpose are follow : 1) For little and average steel castings: Silica sand - 1000 Kg
Silica flour - 70 Kg
Resin - - 50 Kg
Bentonite - 6 to 8 Kg
Dextrin - 8 to 10 Kg
2) Used for important gray iron castings: Silica sand - 200 Kg
Burnt core sand - 720 Kg
Bentonite - 3 Kg
Pitch - 5 Kg
Water - 4.5 to 5.5 Kg
3) Core sand combination for common use: Silica sand - 100 Kg
Starch - 1.5 Kg
Core oil - 1.5 Kg
Water - 2.5 Kg
4) Designed for aluminum casting: Silica sand - 50 Kg
Fine silica - 50 Part
Core oil - 1 Part
Dextrin - 1 Part
Water - 3 Parts
5) Malleable tiny with standard casting: Silica sand - 75 Kg
Burnt sand - 20 Kg
Core oil - 1 Part
Cereal binder - 2.5 Part
6) Bronze with brass castings: Silica sand - 1000 Kg
Core oil bind - 9 litter
7) Used for light gray iron castings: Silica sand - 113 Kg
Core oil - - 2 Parts

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