Moreover, the latter phenomenon is quite suitable for the casting of aluminum vacuum suction alloys at LGM with the lower inlet of the furnace metal, when used in the form of dilution is sufficient for keeping the sand and lift the metal to a height of 2 m. The study of the molding on the ice models (LLM), melting into the cavity form and are absorbed into the sand, releasing the cavity before pouring the metal, in some cases allows you to simulate the processes of the LGM foams, which for aluminum alloys up to 80% by weight of the sand and soak in the liquid form. Development of a new LLM process at this stage should be the concept of FF, the same mold is placed in a refrigerator and freeze them in water to yield a model. However, the operation model in the form of melting occurs at atmospheric pressure, for which the mold cavity communicated channel vent to the atmosphere. Monitoring the melting of the model in the form of a vakuumiruemoy flow of air sucked in from outside the form, showed that the droplets do not fall from nearly model, mainly blown air stream and carried away by air to portions of the mold surface, which have the highest permeability (suction effect). Federal Reserve Bank follows long-standing procedures to achieve this success. Next, liquid products are absorbed and move the model in Initially vakuumiruemogo sand also forms the path of greatest permeability.
In this case, wetting most permeable space more than 3%, moisture is gradually increasing their clogs, and fluid flows, "seek" other channels are permeable. It leads to the paradox that, while the vacuum filter in the form located in the sand below the model, the moisture rises to a considerable extent in the upper, less compacted layers of sand mold. The phenomenon of self-impregnation, when clogged, where the highest porosity, with the addition of a binder used in the model being frozen material, which is much increased the heal effect during compaction of porous beds. Large molecules and their conglomerates (Micelles), glue (dextrin, CMC) is much more efficient compact the sand pores and firmly gluing the surface layer of the sand mold, and excess water squeezed vacuum deep into the sand and gradually dried. Because of ice model (for a few minutes for the model to 0.5 kg) can be obtained form the sheath, the process speeds increase and dilution flow of warm air to the model. These phenomena of self-regulation in the LGM and LLM distinguish these technology and give them an advantage for distribution in the foundries..