What are the factors affect the casting casting shrinkage rate
Release time：04-07
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View volume： 65
In casting solidification process, its each part size is typically narrowed, casting size smaller percentage, called casting line shrinkage or casting shrinkage rate. Manufacture molds (including core box), according to determine the casting shrinkage rate, amplify mold, to ensure the size of cooling after casting meets the requirements. Various sizes in the casting cooling shrinkage can be obtained by type:
X = casting size shrinkage casting shrinkage rate
Of many factors, which affect the casting shrinkage rate, mainly has:
1. Casting material casting, casting shrinkage rate is different also. For example, shrinkage rate is greater than gray cast iron cast steel; Gray cast iron, sulfur in shrinkage rate increases, silicon for shrinkage rate decreases.
2. The structure of the casting structure complex contraction of the casting is difficult, the casting shrinkage rate decrease. For example, the same composition of casting steel, structure shape is different, as shown in figure 30. With the largest free shrinkage of shrinkage.
3. The cast rolled cast concession sex good, casting shrinkage rate increased. For example, with a wet sex and sodium silicate sand mold cast castings than dry type casting casting shrinkage rate. Similarly, increase with the size of the casting, casting the rolled back, the casting shrinkage rate is reduced.
So the casting shrinkage rate combined with actual situation to choose. Size requires precise casting, casting shrinkage according to try pouring castings.
The same casting, due to structural reasons, the axial and radial or length, width and height of three directions of shrinkage rate may not be consistent. For more precise casting size requirement, different shrinkage rate must be taken in all directions. In actual production, the general casting, especially the casting size is not big, in every direction with the same shrinkage rate, although this will cause some error, but the error is general not big, which greatly facilitate mold processing and manufacturing.
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In casting solidification process, its each part size is typically narrowed, casting size smaller percentage, called casting line shrinkage or casting shrinkage rate. Manufacture molds (including core
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