Microfusion and centrifugal casting

Microfusion and centrifugal casting

Microfusion

Casting is a process also known as precision casting, which gives the piece a very good finish condition, which sometimes does not require any machining for delivery to the customer, because the tolerances are very strict driving another great advantage is that it can be almost any metal, these conditions have made their growth, displacing the machining parts in many industries, especially those that require significant production 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 significant infrastructure and not allow the production of large pieces, so it is necessary and conventional casting processes.

This process uses the formation of a "container? very fine sand carried in special binder in which the metal is cast as is evident if the geometry is very intricate, there is always the possibility that the metal does not cover all parts of the mold which is why it is subjected to a centrifugation (centrifugal casting) making it the complete filling of the mold regardless of the geometry of it.

The secret to this type of casting is the formation of the vessels described above, the same one that starts 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 These wax replicas are joined to a generally cylindrical central element, which in its upper part, has a funnel-shaped, assembled in a similar way to a tree branch, this element is also manufactured with wax and once they are integrated wax models, he makes a dip in a mixture of refractory powder and colloidal glue, forming a housing to which a ceramic powder is dusted, depending on wall thickness is required, the dive must be performed many times as needed, then remove the wax inside, heating the mold in a furnace, causing it to melt and evacuate easily, ready to pour the mold gravity metal which solidifies, this requirement is removed shell with mechanical methods.

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

Careful design is needed, when it comes to 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 and solidification helps.