Effect of foamed pattern density on the lost foam process

• Autorzy: Pacyniak T.
• Języki publikacji: EN

Abstrakty

EN

The study examines the effect of the foamed polystyrene pattern density on the process of making castings by the lost foam technique with emphasis put on the analysis of simulation tests. The simulation regarded the effect that pattern density is said to have on the mould cavity filling rate, pressure in the gas gap, and size of this gap. For simulation tests of the full mould process, a mathematical model presented in this study was used. For calculations, the author's own algorithm was applied. The investigations have proved that with decreasing pattern density the pouring rate increases, while pressure in the gas gap and the size of the gap are decreasing. The increasing pouring rate ensures correct making of castings, even if their shapes are very intricate and the wall cross-sections are very small. Smaller size of the gas gap and lower pressure of gases in this gap reduce the risk of mould damage. The author�fs own investigations have proved a very significant effect of the density of foamed polystyrene pattern on the casting process, and specially on the mould pouring rate. The best pouring rate is ensured by patterns of the density comprised in a range of p2 =18-25 kg/m3.

Słowa kluczowe

EN

foundry engineering; lost foam; foamed polystyrene patterns; process of casting

PL

odlewnictwo; procesy odlewnicze; polistyren spieniony; technologia pełnej formy; tracona piana

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2007
• Tom: Vol. 7, iss. 3
• Strony: 231--236
• Opis fizyczny: Bibliogr. 8 poz., rys., tab.

Twórcy

autor

Pacyniak T.

• Technical University of Łódź, Department of Materials Engineering and Production Systems, Stefanowskiego 1/15 Str., 90-924 Łódź,

Bibliografia

• [1] Shroyer H. F.: US Patent No 2, 830, 343, 1958.
• [2] Clegg A. J.: Expanded-polystyrene Moulding - a Status Report, Foundry Trade Journal International, June 1986, 51-69.
• [3] Anon.: Foundry Trade Journal International, 1990, 13, 2, 34.
• [4] Niemann E. H.:Trans A.F.S.,1988, 96, 793.
• [5] Goria C. A., Remondino M. and Seli M.: Foundry Trade Journal,1985, 159, 2312, 188.
• [6] Longnecker E. F., Kanoh K. and Fukuya J. S.: Proceedings of the American Foundryman's Society Conference: Evaporative Foam Casting Technology III,1988, 7.
• [7] Stiepanow U. A.: Litie po gazificirujemym modielam, Moskwa, Maszynostrojenie 1976.
• [8] Pacyniak T.: Theoretical and technical backgrounds of the Lost Foam Process used in castings manufacture. (Teoretyczne i technologiczne podstawy procesu wytwarzania odlewów metodą pełnej formy), Zeszyty Naukowe Nr 985 Politechnika Łódzka 2006