Gravity casting
Gravity casting is one of the well-known casting processes in the manufacture and fabrication of non-ferrous metals and parts. This method is often applied on aluminum, zinc or copper cast products for fine aesthetic quality and large-sized details.
Characteristics of gravity casting method
Gravity casting is a gravitational casting method conducted by pouring molten metal from a crucible and filling the metal into the mold under gravity, without using compressed air, vacuum or centrifugal force. When the metal crystallizes under gravity, the product is finished.
The used gravity molds are usually made of sand, stone, coal, or gypsum because these are easy-to-form materials, not broken when exposed to unexpected high temperatures, not easily deformed and cost. cheap, widely distributed in the market.
The casting parts using gravity technology are usually parts that are not too complicated, do not require too high a precision and can be cast with products with large volumes.
Technology process
The gravity casting process of aluminum, zinc, or copper, … all needs to go through the following 3 basic steps:
The first step is to heat the mold to cover it with a thin layer of anti-stick to separate the mold and at the same time prepare a coating that acts as a coolant for the casting after the part is removed from the mold. .
Second, the metal is melted and poured into the mold until the material fills all of the cavities in the mold. Metal is quantified or poured by hand using a scoop. Typically, the alloy can enter the cavities of the mold from the bottom of the mold so that gravity drops more quickly, contributing to reducing the formation of air holes in the mold, making the casting more durable and closer to when finished product.
Finally, after the casting part is cooled, the mold is opened using either a mechanical tool or a hand. The removed cast finishes the casting process.
Application
Gravity casting technology offers many significant advantages for the manufacturer, helping the casting product with precision and a smoother casting surface many times smoother than sand casting. The casting has improved mechanical properties and is machined in a short time, which saves the manufacturer much time compared to other casting processes.
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