Dimensional stability of the model, lack of a connector shape and consistency of process parameters allow you to be precision castings so as to exceed the precision castings of LPM. In the mold cavity filled with expanded polystyrene, can not get foreign inclusions, which provides fewer blockages. By roughness surface defined in many ways the surface roughness forms, castings castings to meet the LPM. The reason is that in both cases, refractory paint or coating is applied to a model, not the surface form. High quality castings LGM allows for efficient use of the process in the manufacture of castings, which are traditionally manufactured LPM.
The definite advantage to the LGM LPM – the simplicity of its implementation. Practically eliminated or reduced to a minimum coating operations, forming, annealing forms a knockout and cleaning castings. The use of FF instead of LPM reduces consumption of expensive mold materials up to 10 roses Power – 2 – 3 times and labor – 3 – 4 times. For example, the technology of the pump impeller of high alloy by LGM provides such technological parameters of the model of EPS consists of two parts the basic model and the disk cover and their subsequent bonding. This allows you to perform any configuration of the blades of the wheel and avoid the variation in. Other methods of forming, in including LPM and plug shape using a rod, do not provide quality castings. In the manufacture of cast model requires the use of water-soluble cores, because the mold inserts interscapulum can not be performed.
The assembly of rods (even in jig) does not provide ravnostennosti blades in the model. In addition, high-quality coating in interscapulum difficult that leads to defects in castings trudnoispravimym. Consequence of the use of detachable forms a rod – variation in wall thickness of blades and inlets between the rods, whose removal is problematic. Thus, the casting on gasified models to date – the most promising technological process of manufacturing castings weighing from 0.1 to 5 000 kg. instead of well-known classical technologies to produce precision castings. Especially effective is its use in casting slozhnokonstruktsionnyh castings of various alloys.