The difference between castings and forgings

1. Differences in mechanical properties.

After secondary processing, forgings undergo a hardening process that results in a fine arrangement and non-directional mechanical properties superior to castings.

2. Differences in molding methods.

The casting is melted by the melting furnace, poured into the model and cooled to form.The forgings are formed by repeated restriction under the pressure effect of the press.

3. Different materials.

Casting parts: made of direct casting of molten steel, with poor grain size, rough, slightly low metal density and poor stability of mechanical properties;Gear forgings: formed by high temperature forging after casting, fine grain size, slightly high density, stable mechanical   properties.

4. From the non - processing appearance investigation.

The casting pieces are small in grain shape, and the drapery can be seen (the opening of the casting grinding tool).Free forging, casting appearance is black, the appearance is slightly flaky, you can see the casting pleats;The forging, at first glance, is somewhat similar to the casting, but the granular appearance is still relatively fine.And die forging is often done in small pieces, large parts difficult to do.

5. From the processing surface investigation.

Cast iron is significantly different from forgings, cast iron appearance has no luster (will still shine after grinding), the chips of the chip are broken chips, gray cast iron will have powder chips;There is no significant difference between the surface of cast steel and the surface of forgings.

6. From the appearance of the two to distinguish.

The surface of the castings is rough, segregation and shrinkage cavity exist, and the surface of the gear forgings is smooth and shiny.Because the gear forgings are pressed and the castings are solidified.