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Effect of foamed pattern density on the lost foam process

Pacyniak T.

Archives of Foundry Engineering

2007

Vol. 7, iss. 3

231-236

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.

Etapy kształtowania jakości odlewów z żeliwa szarego

Siekański K., Borkowski S.

Archiwum Odlewnictwa

2002

R. 2, nr 6

207-212

W artykule zajęto się analizą całego procesu produkcji odlewniczej, przedstawiono model zarządzania jakością w odlewni żeliwa. Proces odlewania podzielono na etapy i w każdym z nich wskazano czynniki decydujące o tym, by wyrób końcowy procesu był jak najwyższej jakości. Omówiono także czynności kontrolne podejmowane na każdym z wyróżnionych etapów produkcji.

In work it was presented analysis of each stages of casting process from the moment of batch preparation to the obtainment of finished product. The investigative object was the foundry in which are producing parts of machines for heavy industry. In analysis procedure it ascertained, that high quality of finished product decide mostly the stages of production connected with batch preparation, execution of moulds and dressing casting process.