Investigation of the use of variable pressure in the formation of sand-resin casting moulds

Consumer demand increases the efficiency of the operation of cast parts of various equipment, necessitating the development of new technological processes for manufacturing castings. One of the important tasks currently facing the foundry is to increase the purity of the surface of castings and reduce defects due to casting defects. Such properties are possessed by castings obtained by casting into shell molds. Sand-resin mixtures are used for their manufacture. Molds from such mixtures allow the obtaining of high-quality castings from various alloys. The relatively high cost of a pulverbakelite binder prevents its widespread use in industry. In this regard, research aimed at improving the technological processes for manufacturing durable sand-resin moulds while reducing the binder content in the mixture without compromising other parameters is relevant. The disadvantage of the available technological modes of manufacturing shell moulds with the required strength is the high content of binder pulverbakelite (7-9%). Therefore, reducing the pulverbakelite content in the mixture by using the most optimal modes of shell formation, primarily variable pressure, to obtain high-quality castings of the widest range is very relevant.