The ultimate cheat sheet on green sand

Green sand is by far the most widespread molding method used in foundries for metal casting operations. The green sand process utilizes a mold made of compacted moist sand mixed with bonding agent bentonite. Bentonite is a type of clay when mixed with water and sand, and sticks to the sand particles as a tacky coating. This mixture is then filled around a wood or metal pattern and compacted by different methods (jolting, squeezing, air impact, and others). The tackiness ensures that sand particles aggregate and provide strength to the mold even when exposed to high temperatures.

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How to control Compactability of Sand?

Manufacturing industry veteran Al Alagarsamy shares a functional tip for sand production. He explains the importance of sand compactability and the factors affecting it.

What is Compactability?

Compactability relates to the reduction in volume of sand bonded with clay and water after undergoing compression applied by squeezing or compaction.

What is the ideal range for compactability?

Compactability should ideally lie in the range of 36-42.

Why is it important?

Compactability plays an important role in producing good quality molds and castings. It affects sand fill and mold density in the pockets of pattern. It also affects the integrity of mold edges and corners.

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