Визначення тривалості примусового охолодження виливків у контейнерах на ливарних роторно-конвеєрних лініях

• Datum: 2023
• Hauptverfasser: Калюжний, П. Б., Шинський, О. Й.
• Format: Artikel
• Sprache: Ukrainian
• Veröffentlicht: National Academy of Sciences of Ukraine, Physical-Technological Institute of Metals and Alloys of NAS of Ukraine 2023
• Schlagworte: виливок; час охолодження; дисперсний вогнетрив; температура; роторно-конвеєрна лінія
• Online Zugang: https://plit-periodical.org.ua/index.php/plit/article/view/determination-duration-forced-cooling-castings-containers-foundr
• Назва журналу: Casting Processes

УДК 621.74.041 The article is devoted to the developing of a methodology for determining the duration of the technological cycle of cooling castings during the aerodynamic movement of dispersed refractory in containers of foundry rotary-conveyor lines. The use of rotary-conveyor lines is an effective solution for increasing the productivity of foundry technologies. To comply with the principles of construction of rotary-conveyor lines, the cooling time of castings in a mold, as one of the longest technological processes, must be minimized. This can be achieved by forced cooling of castings using the aerodynamic movement of dispersed refractory in the foundry container. As an example of the implementation of this method on a foundry rotary-conveyor line, the sequence of technological operations on the cooling module is described. Based on thermodynamic calculations, an expression for determining the time of forced cooling was obtained, which depends on the thermophysical and geometric characteristics of the casting, the heat transfer coefficient and the temperature pressure on the surface of the casting. An example of calculating the time of forced cooling of steel castings is given. It is shown that when applying the aerodynamic movement of dispersed refractory in the container, the cooling time of the castings to the knocking temperature can be reduced by 6.6-7.5 times compared to the conventional cooling in the sand mold. By changing the airflow rate that liquefies the refractory, the forced cooling operation can be flexibly controlled for different castings that are produced on foundry rotary-conveyor lines.   References 1. Doroshenko V.S., Kaliuzhnyi P.B., Shinskiy V.O. (2018) Technological principles of creation of speed processes of casting in the vacuumized molds for rotor-conveyer complexes. Casting processes. No 3. P. 23–34. [in Russian].2. Shinskiy O.I., Doroshenko V.S., Kravchenko V.P. (2009) Intensification of heat exchange of casting with dispersed refractory of mould at application of cooler and forced convection. Casting processes. No 5. P. 74–82 [in Russian].3. Kaliuzhnyi P. (2020) Influence of Sand Fluidization on Structure and Properties of Aluminum Lost Foam Casting. Archives of Foundry Engineering. Vol. 20. No. 1. P. 122-126. DOI:10.24425/afe.2020.131293.4. Baskakov A.P. (1968) Skorostnoj bezokislitel’nyj nagrev i termicheskaja obrabotka v kipjashhem sloe. [High-speed non-oxidizing heating and heat treatment in fluidized bed]. M.: Metallurgija. 223 p. [in Russian].5. Shalevskaya I. A., Kaliuzhnyi P. B. (2015) Fluidized bed application of in technological process of casting production in vacuumized moulds. Metal and casting of Ukraine. No 4. P. 19-21. [in Russian].6. Veinik A. I. (1960). Teoriia zatverdevaniia otlivok. [Heory of casting solidification]. M.: Mashgiz. 430 p. [in Russian].7. Balandin G.F. (1976) Osnovy teorii formirovaniia otlivki. Ch. 1. Teplovye osnovy teorii. Zatverdevanie i okhlazhdenie olivki. [Fundamentals of the theory of casting formation. Part 1. Thermal foundations of the theory. Solidification and cooling of the casting]. M.: Mashinostroenie. 328 p. [in Russian].8. Kaliuzhnyi P.B., Shalevskaja I.A., Jakovyshin O.A. (2015) Research control method of the castings crystallization process in vacuumized moulds. Metal and casting of Ukraine. No.8, P. 24-28 [in Russian].9. Todes O.M., Tsitovich O.B. (1981) Apparaty s kipiashchim zernistym sloem: Gidravlicheskie i teplovye osnovy raboty [Fluidized Bed Apparatus: Hydraulic and Thermal Fundamentals of Operation]. L.: Khimiia. 296 p. [in Russian].