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Structural shape and strength design of precision sand casting
- Nov 05, 2018 -

Precision sand casting For some cast alloys whose mechanical properties are sensitive to wall thickness, such as ordinary gray cast iron, the method of increasing the wall thickness should be avoided to improve the bearing capacity of the pump castings. For some mechanical properties, the wall thickness is more sensitive. Large casting alloys, such as ordinary gray cast iron, should avoid the use of increased wall thickness to increase the bearing capacity of the casting, but should make the wall thickness of the casting suitable for the cast iron grade selected.

Precision sand casting distributes metal from the need to meet strength and stiffness requirements + avoids unnecessary metal accumulation, and designs the shape of the casting structure according to its grade strength principle to a certain extent, and designs a better structural shape according to the principle of equal strength, which is also the most economical metal. Structure shape.

Precision sand casting will select the appropriate cross-sectional shape according to the strength and stiffness requirements. Among the various cross-sectional shapes of the pump casting beam, some of the cross-sectional shapes have high bending strength and save material. A distinctive feature of structural shapes such as cast iron and magnesium alloys that are compatible with the material properties is that the compressive strength is much higher than the tensile strength. To make full use of the material, an asymmetrical cross section should be used to compress the casting. The stress portion has a small cross section and a large tensile stress.

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