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One of the most similar methods of casting into sand molds is casting aluminum into the ground, while the cost of a kilogram of this casting will be quite small. This technology is quite successfully used in many factories. If the quality issue is not worth it, then this is quite enough to perform rough blanks, which should be fully processed in the future. When using this processing technology, the costs are very high, because with allowances of at least 5 mm, almost all surfaces of the part must be processed. During the processing, shells and pores are often opened due to the mixture embedded in the metal, which simply makes the tools unusable. There are two possible scenarios: either to brew a half-processed part on the machine, or simply reject it because of the large number of defects that have appeared.
Better and more accurate surfaces are obtained by using the technology of casting into molds based on HTS. With sufficient accuracy of LT4 and roughness from RZ80, it is possible not to perform additional processing of parts of the surface. If one is still required, in this case, the allowances can be from 1 to 3 mm. A more technological surface is one in which there is as little "excess" metal in the casting as possible. After all, at the same time, there is a fairly high density in a thin and light casting, due to this, a lower probability of opening shells and pores during its processing is achieved. It should be noted that the cost of casting per kilogram will be different, but at the same time the small mass of the casting allows the cost of casting comparable to the cost of casting into the ground.
As is known, the price per kilogram when casting into the forms of HTS exceeds the price similar to it using casting into the ground. For a wide range of cast parts, this method of casting is preferable, taking into account the much smaller number of defects, the long-term tool life, as well as the shorter required period for the manufacture of spare parts.
To strengthen the mixtures, the composition of the HTS was addedI use urea, urea-furan, phenol-furan resins, as well as a catalyst. The catalyst for hardening the mixture is organic and inorganic acids, such as: benzosulfonic acid, orthophosphoric, nitric.
When using the HTS technology, thermal drying of rods may not be used in the technological process.