Effect of atmosphere in a foundry mould on casting surface quality

• Autorzy: Chojecki A. , Mocek J.
• Języki publikacji: EN

Abstrakty

EN

Changes of gas pressure in the moulding sand in the zone adjacent to mould cavity were analysed during pouring of cast iron. No significant effect of pressure on the surface quality of castings was observed. In the second series of tests, the concentration of hydrogen in the gas atmosphere was measured. It has been found that the value of this concentration depends on metal composition and is particularly high in cast iron containing magnesium. This is due to the reduction of water vapour with the element that has high affinity to oxygen. The presence of hydrogen causes the formation of gas-induced defects on the casting surface.

Słowa kluczowe

EN

sand mould; defects on casting surface; hydrogen concentration; ductile iron

PL

forma piaskowa; wada powierzchni odlewu; stężenie wodoru; żeliwo sferoidalne

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2012
• Tom: Vol. 12, iss. 1
• Strony: 13--18
• Opis fizyczny: Bibliogr. 9 poz., rys., wykr.

Twórcy

autor

Chojecki A.

autor

Mocek J.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Reymonta 23, 31-065 Kraków, Poland,

Bibliografia

• [1] Monroe R. (2005). Porosity in Castings. AFS Trans. Paper 05-245 (04).
• [2] Zych, J., Głazowski, K. & Krzywoń B. (2005). Nakłucia w odlewach motoryzacyjnych wytwarzanych z żeliwa sferoidalnego w technologii in-mold. In. Trans. of the Int. Conference of Founders, 7-9. Mai (195-204). Zakopane- Kościelisko.
• [3] Scraber, P., Bates, C. & Griffin, J. (2006). Avoiding gas defects through mold and core package design. Modern Casting. 96 (12), 38- 40.
• [4] Chojecki, A., Sobczak, N., Mocek, J., Nowak, R. & Siewiorek, A. Gas Evolution from the heated bentonite-bonded Moulding Sand search. Int. Journal of the Cast Metals Research. 1102R. (to be published).
• [5] Chojecki, A. & Mocek, J. (2011). Gas pressure in sand mould poured with cast iron. Archives of Foundry Engeenering. 11 (1), 9-14.
• [6] Mocek, J. & Samsonowicz, J. (2011). Changes of gas pressure in sand mould during cast iron pouring. Archives of Foundry Engineering. 11 (4), 87-92.
• [7] Chojecki, A. & Mocek, J. (2011). Thermochemical study of the gas atmosphere in sand mould. Archives of Foundry Engineering. 9 (1), 135-140.
• [8] Orlenius, J., Dioszegi, A. & Dioszegi, Z. (2008). Gas absorption in gray iron during mould filling. Int. Journal of Cast Metals Research. 21, 427-434.
• [9] Chojecki, A. & Mocek, J. (2010). Hydrogen in reoxidation process. Technolog. 2, 71-76.