TECHNOLOGICAL PROCESS

Nowadays, foundries supply practically all the branches of engineering and tool production. The production of complicated components of machine and technological devices by classic mechanical machining, moulding, welding etc. is, with respect to the usage of expensive materials, energy and high elaborateness, becoming uneconomic.  That´s why there is an effort to substitute these technologies with casting of the components.
The increased requirements concerning the physical and mechanical qualities of these components or semi-products can only be fulfilled by using an appropriate unconventional method of mould production or casting.

One of the most accurate casting methods is the casting into the moulds made by lost wax model method. The basis of this method is the manufacture of a high accurate, undismountable, non-permanent wax model with the help of which an undismountable ceramic shell mould is made from liquid moulding mixtures. At small castings a model set („tree“) is created. It is connected with the model of the inflow system. Then, a sufficiently strong shell mould is made around this tree. Before casting, the models are removed from the mould by smelting, burning or melting down. Then the casting is carried out. This technology is more than 4000 years old and there are several variants of it nowadays. Casting with regulated pressure is appropriate for simple shapes, for perfect filling of the mould cavity, especially in case of thin walls or complicated shapes. However, an air pressure, vacuum or centrifugal force are needed. After the hardening, the mould is broken and the finished casting is removed. The technology is appropriate for almost all materials with melting point to 2200°C.