Investment Castings Importance or Benefits

Casting is a process known as precision casting, which gives the piece a finished condition very good, sometimes it does not require any machining for delivery to the customer, because the tolerances are very strict handling, other great advantage is that it can be done in almost any metal, these conditions have marked its growth, displacing machined parts in many industries, especially those that require significant production of components such as automotive, arms industry, especially the related to so-called Hand guns, textile, etc.

Additionally it is a very flexible, which allows great freedom in design with intricate geometries, unfortunately requires a strong infrastructure and do not allow the manufacture of large, which is necessary and conventional casting processes.

This process uses the formation of a «vessel» very fine sand carried in special bonded, in which the metal is strained as is evident if the geometry is very intricate, there is always the possibility that the metal does not cover all parts of why mold is subjected to a centrifugal (centrifugal casting) making it the complete filling of the mold regardless of its geometry. See below various casting products by leading Investment casting foundry in India.

The secret of investment castings is in the formation of the containers described above, it begins with obtaining a model which is used to manufacture various molds, which give rise to identical reproductions of the piece to be manufactured, made in wax these reproductions are joined to a generally cylindrical central element, which on top has a funnel shape, are assembled in a similar way to a tree branch, this element is also manufactured with wax and once they are embedded in wax models, was performed immersion in a mixture of refractory powder and a colloidal binder, forming a housing to which a ceramic powder is sprinkled, depending on the thickness of the walls is required, the dive must be performed as often as necessary, then removed interior wax, heating the mold in an oven, making it melt and easily evacuate, the mold is ready pour the metal which solidifies gravity, to meet this requirement shell is removed by mechanical methods.

Should be considered, as in all casting, metal contraction as it cools, and the ceramic powder particle size, since smaller particle sizes, smooth surfaces were obtained, but the mold are becoming more sensitive.

We need a careful design, as regards the size of the piece, nerves (thick), solid parts, preventing pores, combination of walls, changes in section should not be abrupt, sharp corners removed, the use of male is also an important consideration, since they must be perfectly placed, and its use is justifiable only when the piece is very large hole in the casting as it helps to solidification.

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