Generally, the steel casting foundry during solidification, its parts are generally required to shrink the size of the casting size reduction percentage, called the casting line or shrinkage casting shrinkage. The manufacture of molds (including the core box), casting shrinkage determined according to the number of mold amplification to ensure that the size of the casting after cooling to meet the requirements. When casting cooling contraction amount of each size by the following formula:

X= Shrinkage casting *shrinkage casting size 
Factors influencing the casting shrinkage more, mainly:

1. The casting material casting material is different, casting shrinkage is also different. For example, steel shrinkage greater than gray cast iron; gray iron sulfur for a long time, the shrinkage rate increases, reduced shrinkage of silicon for a long time.

2. Structure of the casting structure complicated casting shrinkage difficulties casting shrinkage is reduced. For example, the same composition cast steel castings, due to the structure of different shapes, including a free shrinkage maximum contraction.

3. The casting mold of concession concession good casting shrinkage increases. For example, shrinkage and water glass with wet sand than dry-type casting casting casting casting large. Similarly, with the increase in the size of the casting, mold concession deteriorated, shrinkage of the casting will be reduced.

So casting shrinkage conjunction with the actual situation to choose. Size requires accurate casting, casting shrinkage to be amended in accordance with the test pouring castings.

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