Shortcomings of traditional foundry enterprises in production site

superiority

1, the cooling rate of metal mold is faster, the structure of casting is denser, it can be strengthened by heat treatment, and the mechanical properties are improved by about 15% compared with sand casting.

2, metal mold casting, the casting quality is stable, the surface roughness is better than sand mold casting, and the rejection rate is low.

3, good working conditions, high productivity, easy for workers to master.

disadvantaged

1, the thermal conductivity of metal mold is large and the filling ability is poor.

2. The metal mold itself has no air permeability. Corresponding measures must be taken to exhaust effectively.

3, the metal mold does not give in, and it is easy to crack and deform during solidification.

sand mould casting

superiority

1. Compared with other casting methods, sand casting has the advantages of low cost, simple production process and short production cycle.

2. Because the molding materials used in sand casting are cheap and easy to obtain, the mold manufacturing is simple, and it can adapt to the single piece production, batch production and batch production of castings.

disadvantaged

The quality of molding sand and core sand directly affects the quality of castings. The poor quality of molding sand will cause defects such as porosity, sand holes, sand sticking and sand inclusion in castings.

Extended data

Sand casting has wide adaptability, including small pieces, large pieces, simple pieces and complex pieces, single pieces and large quantities. Sand mold has higher fire resistance than metal mold, so this process is also used for materials with higher melting point, such as copper alloy and ferrous metal.

The mold used for sand casting is made of wood, commonly known as wooden mold. In order to improve the dimensional accuracy, aluminum alloy molds or resin molds with long service life are often used. Although the price has increased, it is still much cheaper than the mold used in metal mold casting, and the price advantage is particularly prominent in the production of small batches and large pieces.

When using permanent mold casting, the following factors must be considered comprehensively: long manufacturing cycle and high cost, which are not suitable for single piece and small batch production; Not suitable for casting complex shapes (especially cavities), thin-walled and large castings (metal molds are not suitable for producing particularly large castings due to the limitations of mold material size, cavity processing equipment and casting equipment). Mold cost is more expensive than sand mold and cheaper than die casting.

Baidu encyclopedia-metal casting

Baidu encyclopedia-sand casting