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Gravity casting is a metal casting method that utilizes the gravitational force of liquid metal to flow into a sand mold through free fall for casting; Sand casting refers to the use of sand molds as casting molds, in which liquid metal is poured into the sand molds for casting. The main differences between them are as follows:

Principle and construction method: Gravity casting is a process of filling the mold cavity through the free fall of liquid metal, which is easy to operate and suitable for larger castings; Sand casting is the process of pouring liquid metal directly into a sand mold, which requires the use of compaction tools to fill and compact the sand mold.

Filling process: In gravity casting, the metal liquid enters the sand mold through free fall, and the filling speed is relatively slow; In sand casting, the metal liquid is poured into the sand mold, and the filling speed is faster.

Scope of application: Gravity casting is usually suitable for large castings and small to medium-sized castings, and is suitable for products with lower production costs or small to medium batch production; Sand casting is suitable for castings of various specifications and shapes, and can be flexibly adjusted to meet different needs.

Surface quality: Gravity casting usually achieves good surface quality due to its slow filling speed; Due to the fast filling speed, sand casting may have defects such as sand holes and shrinkage holes, which require subsequent repair and treatment.

Equipment and process requirements: Gravity casting equipment is simple, and the process requirements are relatively low; However, sand casting requires the preparation of sand molds, cores, etc., which are relatively complex to operate and have high requirements for the process.

Suitable casting methods need to be selected based on specific product requirements, budget, casting size, and production requirements. Gravity casting is suitable for low-cost products and small to medium batch production, while sand casting can adapt to casting requirements of different specifications and shapes.