Casting methods are usually sand casting, followed by special casting methods, such as metal casting, investment casting, gypsum casting, etc. Sand casting can be divided into clay sand mold, organic binder sand mold, resin self-hardening sand mold, lost foam mold, etc.

Principles of Casting Method Selection:

1 Sand casting is preferred because sand casting has lower cost, simpler production process and shorter production cycle than other casting methods. When the wet mold cannot meet the requirements, then consider using clay sand surface dry sand mold, dry sand mold or other sand molds. The weight of clay green sand castings can range from several kilograms to tens of kilograms, while the weight of clay dry castings can reach tens of tons.

The casting method should be suitable for the production batch. Low pressure casting, die casting, centrifugal casting and other casting methods are only suitable for mass production because of the high cost of equipment and molds.

The modeling method should be suitable for the factory conditions.

For example, it is also used to produce castings such as large machine tool beds. Generally, the core assembly molding method is adopted, instead of making patterns and sand boxes, the cores are assembled in pits. While other factories use sand box molding method to make patterns. Different enterprises have different production conditions (including equipment, venues, staff quality, etc.), production habits, and accumulated experience. What products are suitable and what products are not suitable (or cannot be) should be considered according to these conditions.

4. Both the precision requirement and cost of castings should be considered.

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