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Shenyang jingui casting factory
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The gray iron casting has the characteristics of precise casting, accurate size, good repeatability and precision casting. Large bed casting with high surface finish; The machine tool bed casting defects and waste products caused by mold taking and case closing are eliminated. The gate with reasonable shape can be set at an ideal position, which is not restricted by traditional factors such as parting and mold taking, so as to reduce the internal defects of the casting. Combined pouring, a box of more than one piece, greatly improve the process production rate and production efficiency of large machine tool castings.
It reduces the machining margin and reduces the machining cost. The dry sand mould without binder, moisture and any additive was adopted to eliminate all kinds of casting defects and wastes caused by moisture, additives and adhesive. The sand treatment system is greatly simplified, and the sand treatment system can be reused. Large bed castings have no flash burr, which reduces the cleaning and polishing workload by more than 50%. Generally, gravity casting is adopted, and low-pressure casting, centrifugal casting and other processes can be adopted when special requirements are met. Sand mold casting has wide adaptability, small pieces, large pieces, simple pieces, complex pieces, single pieces, large quantities can be used.
The molds used for sand casting used to be made from wood. The wood mould is easy to be deformed and damaged. In addition to the sand mold castings produced by a single piece, the aluminum alloy mould or resin mould with high dimension precision and long service life can be used. Although the price has increased, it is still much cheaper than the metal mold used for casting, especially in the production of small batch and large parts.
In addition, the sand type is more refractory than the metal type, so materials with higher melting points such as copper alloy and black metal are more likely to adopt this process. Hot chamber die casting machine high degree of automation, less waste of materials, the production efficiency is higher than cold chamber die casting machine, but the restriction of the parts heat resistant ability, it is only used in zinc alloy, magnesium alloy and other low melting point materials of casting production. Today's widely used aluminum alloy die casting pieces, because of the high melting point, can only be produced in the cold chamber die casting machine.
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Grey iron castings