Method for low-pressure permanent-mould casting of valves, preferably for firefighting equipment

摘要

the invention relates to method of low-pressure permanent mould casting valves, especially fire-fighting equipment, namely that the alloy of aluminium - silicon containing by weight 6,50% - 7.50% of silicon (si), 0,35% - 0,45% magnesium (mg), 0,35% - 0,55% copper (cu), 0.10% - 0.20%, iron (fe), 0,10% - 0,15% manganese (mn), 0.12% - 0.15% titanium (ti) and the rest of the composition is an aluminium (al) are casting kokilowemu at 700 - 800u00b0c, then obtained a dogniata and subjected utwardzaniu temperature, which includes: przesycanie at ok. 500 - 550u00b0c, cooling in water at 50 - 60u00b0c and aging accelerated by temperature.160 - 180u00b0c by 12 - 16 hours, after which the sheet is a crowded elements handles and lever and a mold processed particle board.