Advantages and disadvantages of forging and casting
Forging can eliminate defects such as as-cast porosity produced in the metal smelting process and optimize the microstructure. At the same time, due to the preservation of complete metal flow lines, the mechanical properties of forgings are generally better than castings of the same material. For important parts with high loads and severe working conditions in related machinery, forgings are mostly used, except for plates, profiles or weldments that can be rolled with simpler shapes.
Parts with complex shapes can be produced, especially blanks with complex inner cavities.
2. Wide adaptability, metal materials commonly used in industry can be cast, ranging from a few grams to hundreds of tons.
3. Wide sources of raw materials and low prices, such as scrap steel, waste parts, chips, etc.
4. The shape and size of the casting are very close to the parts, which reduces the amount of cutting and belongs to non-cutting processing.
5. It is widely used. 40%~70% of the weight of agricultural machinery and 70%~80% of the weight of machine tools are castings.
In forging production, trauma accidents are prone to occur.
1. The mechanical properties are not as good as forgings, such as coarse structure and many defects.
2. In sand casting, single piece and small batch production, the labor intensity of workers is high.
3. The quality of castings is unstable, there are many processes, the influencing factors are complex, and many defects are prone to occur.