JUSTIFICATION OF RATIONAL KINEMATIC CHARACTERISTICS OF MOLDING VIBRATING TABLE

P. G. Anofriev

Abstract


Purpose. One of the efficient ways to obtain castings of complex shape is lost foam casting (LFC) in the evacuated molds (containers). Upgrading the quality of this casting method requires improvement of molding techniques. The molding process involves layer-by-layer vibratory compaction of sand in the containers. Most of the lines of LFC sections are equipped with vibrating tables with inertia oscillators driven by induction motors, operating at nominal speed. A promising way of improving the molding technique is the rational setting of the following parameters of vibrating table: vibration displacement, velocity and acceleration. These parameters are determined by the elastic-mass characteristics of the system «vibrating table – mold» and perturbing forces created by inertia oscillators. The aim of the study is to determine the rational range of setting the parameters of oscillators at which the qualitative layer-by-layer compaction of the molding sand in the mold takes place. Methodology. The efficiency criterion for setting characteristics of the vibrating table there were taken the values of averaged accelerations of 6.5 – 7.5 m/s2 corresponding to maximum compaction degree of dry molding sand and the range of acceleration values 9 – 9.5 m/s2 for giving the sand «pseudo-yielding». For the study it was developed a mathematical model of oscillations of the movable part of vibrating table with two types of casting containers for steady and transient operation modes. Findings. In the process of research of the mold oscillations it was calculated the natural frequencies of oscillations at different elastic-mass characteristics of the system using a mathematical model. It was constructed the frequency response of displacements and accelerations of the moving part of the table with container filled with molding sand layer-by-layer. Originality. The author proposes a method of determining the range of frequency setting of inertial oscillators of table, which make it possible to obtain qualitative compaction of dry molding sand in the mold. Practical value. In the process of molding using the lost foam casting models the mold mass is increasing due to the layer-by-layer filling of the mold with molding sand. The change of mass characteristics of the mold requires operational change of the kinematic characteristics of the vibrating table – vibration acceleration. The proposed mathematical model allows determining the ranges of setting the frequency parameters of inertial oscillators of molding table at all stages of molding.


Keywords


vibratory compaction; molding; vibrating table; mathematical model; natural frequencies; frequency response

References


Bolotin, V. V. (1978). Vibratsii v tekhnike. Tom 1: «Kolebaniya lineynykh system». Moscow: Mashinostroyeniye.

Goncharevich, I. F., & Frolov, K. V. (1981). Teoriya vibratsionnoy tekhniki i tekhnologii. Moscow: Nauka.

Gulyayev, B. B., & Gornyushkin, O. A. (1987). Formovochnyye protsessy. Lvov: Mashinostroyeniye.

Doroshenko, V. S. (2013). Gazodinamicheskoye uplotneniye sukhikh formovochnykh napolniteley. Litye i metallurgiya – Casting and Metallurgy, 2, 15-22.

Doroshenko, V. S. (2016). Gazodinamicheskoye uplotneniye sypuchikh peschanykh smesey. ITB «Litye Ukrainy» – Information and Technical Bulletin «Casting of Ukraine», 2(186), 13-19.

Dyakonov, V. (2001). Mathcad 2000. Saint-Petersburg: Piter.

Stepanov, Y. A. (1976). Litye po gazifitsiruyemym modelyam. Moscow: Mashinostroyeniye.

Loytsyanskiy, L. G., & Lurye, A. Y. (1983). Kurs teoreticheskoy mekhaniki. Tom 2. Moscow: Nauka.

Panovko, G. Y. (1980). Vvedeniye v teoriyu mekhanicheskikh kolebaniy. Moscow: Nauka.

Rusakov, P. V., Shinskiy, O. I., & Zdokhnenko, V. V. (2010). Model LTS s sinkhronizirovannymi po chastote vibratsionnymi mashinami. Protsessy litya – Casting Processes, 3(81), 36-45.

Rybakov, S. A. (2009). Innovatsionnyye vozmozhnosti litya po gazifitsiruyemym modelyam, sostoyaniye i perspektivy etogo metoda v Rossii. Liteyshchik Rossii – Russian Caster, 4, 44-45.

Shatalova, I. G., Gorbunov, N. S., & Likhtman, V. I. (1965). Fiziko-khimicheskiye osnovy vibratsionnogo uplotneniya poroshkovykh materialov. Moscow: Nauka.

Shinskiy, O. I., & Doroshenko, V. S. (2009). Litye v obolochkovyye formy, poluchennyye propitkoy sukhogo peska svyazuyushchim. Metall i litye Ukrainy – Metal and Casting of Ukraine, 7-8, 16-22.

Shulyak, V. S. (2004). Litye po gazifitsiruyemym modelyam. Saint-Petersburg: NPO «Professional».

Shulyak, V. S. (2007). O sostoyanii i razvitii proizvodstva otlivok lityem po gazifitsiruyemym modelyam v Rossii. Paper presented at 1-ya Mezhdunarodnaya nauchno-prakticheskay konferentsiya «Litye po gazifitsiruyemym modelyam», Saint-Petersburg.

DeGarmo, E. P., Black, J. T., & Ronald, A. K. (2003). Materials and Processes in Manufacturing. New York: Wiley.

Tilabov, B.К. (2009). Heat Treatment of Wear Resistant Hardalloyed Coating of the Details Obtained by Casting on Gasified Models. Mining Magazine, 8, 95-97.

Zhongde Shan, Limin Liu, & Feng Liu, (2014). Patent WO2014101323 A1 China. no. PCT/CN2013/070448. China Academy of Machinery Science & Technology.


GOST Style Citations


  1. Вибрации в технике : cправочник в 6 т. / под. ред. В. В. Болотина. – Москва : Машиностроение, 1978. - Т. 1 : Колебания линейных систем. - 352 с.
  2. Гончаревич, И. Ф. Теория вибрационной техники и технологии / И. Ф. Гончаревич, К. В. Фролов. - Москва : Наука, 1981. - 320 с.
  3. Гуляев, Б. Б. Формовочные процессы / Б. Б. Гуляев, О. А. Горнюшкин. – Львов : Машиностроение, 1987. – 264 с.
  4. Дорошенко, В. С. Газодинамическое уплотнение сухих формовочных наполнителей / В. С. Дорошенко // Литье и металлургия. – 2013. – № 2. – С. 15-22.
  5. Дорошенко, В. С. Газодинамическое уплотнение сыпучих песчаных смесей / В. С. Дорошенко // Литье Украины : информ.-техн. бюл. – Киев, 2016. – № 2 (186). – С. 13-19.
  6. Дьяконов, В. Mathcad 2000 / В. Дьяконов. – Санкт-Петербург : Питер, 2001. - 592 с.
  7. Литье по газифицируемым моделям / под ред. Ю. А. Степанова. – Москва : Машиностроение, 1976. - 224 с.
  8. Лойцянский, Л. Г. Курс теоретической механики / Л. Г. Лойцянский, А. Е. Лурье. – Москва : Наука. 1983. – Т. 2. - 640 с.
  9. Пановко, Г. Я. Введение в теорию механических колебаний / Г. Я. Пановко. – Москва : Наука, 1980. - 272 с.
  10. Русаков, П. В. Модель ЛТС с синхронизированными по частоте вибрационными машинами / П. В. Русаков, О. И. Шинский, В. В. Здохненко // Процессы литья. – 2010. – № 3 (81). – С. 36-45.
  11. Рыбаков, С. А. Инновационные возможности литья по газифицируемым моделям, состояние и перспективы этого метода в России / С. А. Рыбаков // Литейщик России. – 2009. – № 4. – С. 44-45.
  12. Шаталова, И. Г. Физико–химические основы вибрационного уплотнения порошковых материалов / И. Г. Шаталова, Н. С. Горбунов, В. И. Лихтман. – Москва : Наука, 1965. - 165 с.
  13. Шинский, О. И. Литье в оболочковые формы, полученные пропиткой сухого песка связующим / О. И. Шинский, В. С. Дорошенко // Металл и литье Украины. – 2009. – № 7–8. – С. 16–22.
  14. Шуляк, В. С. Литьё по газифицируемым моделям / В. С. Шуляк. – Санкт-Петербург : НПО «Профессионал», 2007. – 408 с.
  15. Шуляк, В. С. О состоянии и развитии производства отливок литьем по газифицируемым моделям в России / В. С. Шуляк // Литьё по газифицируемым моделям : сб. тр. 1-й Междунар. науч.-практ. конф. - Санкт-Петербург, 2007. - С 58.
  16. Degarmo, E. P. Materials and Processes in Manufacturing / E. P. Degarmo, J. T. Black, K. Ronald. - New York : Wiley, 2003. - 1168 p.
  17. Tilabov, B. К. Heat Treatment of Wear Resistant Hardalloyed Coating of the Details Obtained by Casting on Gasified Models / B. K. Tilabov // Mining Magazine. – 2009. – № 8. – P. 95-97.
  18. Patent WO2014101323 A1 China, Large-sized digital patternless casting forming machine / Zhongde Shan, Limin Liu, Feng Liu ; Advanced Manufacture Technology Center, China Academy Of Machinery Science & Technology. – № PCT/CN2013/070448 ; stated 15.01.2013 ; published 03.07.2014, Patentscope. – 4 p.


DOI: https://doi.org/10.15802/stp2016/90496

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