Changes of gas pressure in sand mould during cast iron pouring

• Autorzy: Mocek, J. , Samsonowicz, J.
• Języki publikacji: EN

Abstrakty

EN

The paper presents a test method developed to measure changes of gas pressure in sand moulds during manufacture of iron castings. The pressure and temperature measurements were taken in the sand mould layers directly adjacent to the metal - mould interface. A test stand was described along with the measurement methodology. The sensors used allowed studying the fast-changing nature of the processes which give rise to the gas-originated casting defects. The study examined the influence of binders, clays and refining additives on the nature of the gas evolution process. The effect of the base sand type - quartz or olivine - on the nature of pressure changes was compared. The test stand design ensured the stability of technological parameters in the examined mould elements, and a repeatable process of making pilot castings. The main outcome was classification of sand mixtures in terms of pressure occurring during pouring of iron castings. The obtained results confirm the usefulness of the described method for testing gas pressure occurrence in a sand mould.

Słowa kluczowe

PL

gazy; forma piaskowa; wada odlewu; ciśnienie; żeliwo

EN

gases; sand mixtures; castings defects; pressure; cast iron

• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2011
• Tom: Vol. 11, iss. 4
• Strony: 87-92
• Opis fizyczny: Bibliogr. 15 poz., rys., tab., wykr.

Twórcy

autor

Mocek, J.

autor

Samsonowicz, J.

• AGH, Faculty of Foundry Engineering, Section of Mould Technology, ul. Reymonta 23, 30-059 Krakow, Poland,

Bibliografia

• [1] Z. Falęcki: Analiza wad odlewów. Wydawnictwo AGH, Kraków 1997.
• [2] T. Szmigielski: Simultaneous recording of temperature, humidity and gas pressure in damp sand moulds, Archives of Foundry, vol.4 issue 11/2004, s.241-247.
• [3] T. Szmigielski: Pressure and temperature changes in a sample cross of moulding sand with bentonite, Archives of Foundry, vol.4 issue 11/2004, s.235-240.
• [4] T. Szmigielski: Measurement of gas pressure in sand mould, Archives of Foundry, vol.4 issue 3/2004, s. 163.-171.
• [5] T. Szmigielski: Simultaneous recording of temperature, humidityand gas pressure in damp sand moulds, Archives of Foundry, vol.6 issue 22/2006, s.532-539.
• [6] A. Chojecki, J. Mocek: Evolution of the gas atmosphere during filing the sand moulds with iron alloys, Archives of Foundry Engineering, vol.9 issue 4/2009, s.135-140.
• [7] A. Chojecki, J. Mocek,: Hydrogen in reoxidation process, Technolog, vol.II, special issue, april 2010, s.71-76.
• [8] A. Siewiorek, R. Nowak, A. Chojecki, J. Mocek: Gas evolution rate from heated moulding sands bonded with organic binders, Archives of Foundry Engineering, vol.11 issue 1/2011, s.87-92.
• [9] A. Chojecki, N. Sobczak, J. Mocek, R. Nowak, A. Siewiorek: Gas evolution from the heated bentonite bonded moulding sand, To be published.
• [10] P. Jelinek: Vyvoj uhlikatych aditiv bentonitovych smesi nove generace, XI Konferencja Technical 2008.
• [11] J.Campbel : Castings, second edition, E Elsevier Butterworth Heinemann, 2004.
• [12] J.Orlenius, A.Dioszegi, Z. Dioszegi.: Gas absorption in gray iron during mould filling. Int. Journal of Cast Metals Research. v.21, issue 6, 2008, pp 427-434.
• [13] J. Beńo P. Jelinek: Solution of negative impact of carbonaceus additives to bentonite mixtures, International Foundry Congress, Istambul 3 June 2009.
• [14] J. Zych: Over -moisture zone in moulding sands with water glas - ultrasonic investigations of kinetics of its formation, Przegląd Odlewnictwa, 11-12, (2003) s. 406-414.
• [15] M. Holtzer: May the coal dust be eliminated from the classical moulding sand?, Przegląd Odlewnictwa 12 (2005) s. 794-799.