CASTING CORES AND MOULDING BATCH PRODUCTION METHOD

CASTING CORES AND MOULDING BATCH PRODUCTION METHOD

Process comprises mixing foundry sand (95-99 per cent by weight) with 1-5 per cent ''urelit'' type urea formaldehyde resin. To increase stripping efficiency, 0.1-10 per cent of polyvinyl alcohol in powder form is added to the mix. The urelit:powder ratio is 0.4-0.6, and the cores...

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Bibliographische Detailangaben
Hauptverfasser: RIZESCU PANTAZI, RO, SURDULESCU MIRCEA, RO, GANEA MIHAIL VIRGIL, RO, CRETU SILVIU DAN, RO, COCOLAS SIMION, RO, SABAU TEODORA, RO
Format: Patent
Sprache:eng ; rum
Schlagworte:
CASTING
CASTING OF METALS
CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
FOUNDRY MOULDING
PERFORMING OPERATIONS
POWDER METALLURGY
TRANSPORTING
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Beschreibung
Zusammenfassung:Process comprises mixing foundry sand (95-99 per cent by weight) with 1-5 per cent ''urelit'' type urea formaldehyde resin. To increase stripping efficiency, 0.1-10 per cent of polyvinyl alcohol in powder form is added to the mix. The urelit:powder ratio is 0.4-0.6, and the cores and moulds facilitate casting of non-ferrous alloys at temps. of at least 600 deg.C.