Metal casting is the metal smelting into a certain requirements of the liquid and poured into the mold, the cooling and solidification, finishing treatment to get a predetermined shape, size and performance of the casting process. The casting of the embryo is due to the near-forming, and the purpose of achieving a free machining or a small amount of processing reduces Metal Casting the cost and reduces the time to a certain extent. Casting is one of the basic processes of modern machinery manufacturing industry.
Metal casting, a very precise metal forming process, through the high pressure of molten liquid metal into the steel mold, to create a complex shape of metal parts.
Cost of process: mold cost (high), single piece cost (low)
Typical products: transport, furniture, kitchen utensils and so on
Metal Casting Production is suitable: only suitable for mass production
Quality: finished parts surface high precision
Speed: fast, the specific time depends on the size of the workpiece size and shape of the complexity
Metal casting design considerations
1. Suitable for metal parts with complex shapes, allowing the formation of internal parts and ribs
2. High-pressure drawing die forming parts of the surface accuracy is extremely high
3. Part wall thickness can be less than any other casting process
4. Draft angle recommended: 1.5 °
5. Tensile casting is particularly suitable for the formation of small pieces of metal parts, more than 9kg parts to consider other casting process
Metal casting process of forming machinery have also been introduced. Has been developed to produce from 600 tons to 2,000 tons of semi-solid casting die-casting machine, forming the weight of up to 7kg or more. At present, in the United States and Europe, the application of the technology is more extensive. Semi-solid metal casting process is considered to be one of the Metal Casting most promising near-net forming and new material preparation technologies in the 21st century.
Metal casting process principle
In the ordinary casting process, the primary crystal grows in dendrites, and when the solid fraction reaches about 0.2, the dendrites form a continuous network skeleton and lose the macroscopic mobility. If the liquid metal is strongly agitated from the liquid phase to the solid-phase cooling process, the dendritic network skeleton which is easy to be formed during the ordinary casting molding is broken and the dispersed granular structure is retained and suspended in the remaining liquid phase. This granular non-dendritic microstructure has a certain rheological property at a solid phase rate of 0.5 to 0.6, so that metal forming can be achieved by conventional forming processes such as die casting, extrusion, die forging and the like.