process in which the casting is obtained by the method of free casting metal in a molten state in a special form, is called "investment casting".
The technology process is quite complicated.You first need to create a special master model, which will be a kind of prototype that will be melted, t. E. Will serve as a reference point in the direction that will guide development.
To make the master model, specialists often use materials such as wood and plaster.In the role model can act and has already produced at another plant product.The next step - creation of the matrix and mold.They just need to carry out injection molding.
Molds are usually filled with tallow or wax, as these substances have high levels of plasticity, which allows the output to get all sorts of shapes.
further required to smelt in the form of a new cavity - working.It is obtained by the method of melting.That is why the process is called "investment casting".
while casting itself remains in the shell created from special composition capable of withstanding very high temperatures, which before the casting procedure is carefully processed model.After solidification workers dismantled form.
In conventional investment casting stearin or wax removed with hot water.Shells which are obtained by this process, then the calcination step are sequentially and pouring molten metal.Calcination of the shell is heated to temperatures often exceeding 900 degrees Celsius, which solves the problem of getting the organic compounds in the composition, which can reduce the quality fails to eliminate at the output of products obtained.
Separately, it should be noted that the shell should be made taking into account the resistance to a wide variety of chemical compounds.
That investment casting allows you to output the casting mass may be a few grams, but can - a few tons.The thickness of the side walls of the product can be just half a millimeter, which meets all internationally accepted standards.
with the concept of investment casting, therefore, directly related to the concept of precision casting.It means almost complete identity castings manufactures both in size and shape.
process Investment Casting is very popular both in Russia and in the rest of the world.There are even pilot plants, allowing to carry out injection molding.
To implement the process of investment casting requires a whole set of different devices and systems.The technological process includes the fabrication and subsequent casting, made of ceramic, drying them, refractory coating composition and the melting stearin, cleaning castings obtained.All the above process is rather complicated and time-consuming.
