METALLOSTATIC PRESSURE FUNCTION IN THE QUALITY OF Al-Si ALLOY CASTINGS MADE IN SAND MOULDS

Authors

  • Jerzy Zych AGH University of Science and Technology, Faculty of Foundry Engineering, Krakow, Poland
  • Marcin Wójcik AGH University of Science and Technology, Faculty of Foundry Engineering, Krakow, Poland
  • Joanna Kolczyk AGH University of Science and Technology, Faculty of Foundry Engineering, Krakow, Poland
  • Tomasz Snopkiewicz AGH University of Science and Technology, Faculty of Foundry Engineering, Krakow, Poland

DOI:

https://doi.org/10.7494/mafe.2014.40.3.191

Keywords:

aluminium casting, metallostatic pressure, density, surface roughness

Abstract

The paper presents results of the studies regarding influence of metallostatic pressure of AlSi7Mg alloy on surface roughness of castings prepared in sand moulds as well as on alloy’s density. Castings in a cylindrical shape with a diameter of 15.0; 25.0 or 3.5 mm and height of 700 mm that were cast in a vertical orientation are investigated. The melted alloy was poured into moulds in two ways: bottom up, and top down. Higher pressure and larger diameter of castings favors increase
of surface roughness. In the analyzed range of height of a metal column, density increases linearly: for instance, in case of castings with diameter of ø25 mm, the density increases from ρ = 2.60 g/cm3 to ρ = 2.68 g/cm3, what is about 0.10 g/cm3. In the roller with larger diameter, the density is slightly smaller, however the range of changes along the longer axis is similar to that in the cylinder with diameter of ø25 mm. Additional, ultrasonic studies were performed, which prove that with small changes of the alloy density, velocity of a longitudinal wave changes only slightly. Thus, it is difficult to control small variations (Δρ < 0,10 g/cm3) in density of AlSi7Mg alloy with ultrasonic technique.

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References

Notkin Ye.M.: Printsipy postroyeniya litnikovykh sistem dlya alyuminiyevykh splavov. [In:] Vnitol, Fasonnoye lit'ye alyuminiyevykh splavov. Mashgiz, Moskva, 1953

Al'tman M.B., Lebedev A.A., Chukhrov M.V.: Plavka i lit'ye legkikh splavov. Metallurgiya, Moskva, 1969

Zych J., Papaj P.: Gładkość powierzchni odlewów ze stopów Al-Si wykonywanych w formach piaskowych. IX Międzynarodowa Konferencja Naukowo-Techniczna Odlewnictwa Metali Nieżelaznych; 1–3.06. 2006,

–140

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Published

2015-07-11

How to Cite

Zych, J., Wójcik, M., Kolczyk, J., & Snopkiewicz, T. (2015). METALLOSTATIC PRESSURE FUNCTION IN THE QUALITY OF Al-Si ALLOY CASTINGS MADE IN SAND MOULDS. Metallurgy and Foundry Engineering, 40(3), 191. https://doi.org/10.7494/mafe.2014.40.3.191

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