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2 209 127

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IPC

(21) (22)

Application

2002126014/02, 2002-09-30

(24)

Start date

2002-09-30

(22)

Actual filing date

2002-09-30

(45)

Published

2003-07-27

(72)

Inventor

Znamenskij L.G.

(73)

Holder

Juzhno-Ural'Skij Gosudarstvennyj Universitet

METHOD FOR MANUFACTURING MOLDS AND CORES ON BASE OF GYPSUM BINDER AT MAKING CASTINGS OF NON- FERROUS AND PRECIOUS ALLOYS Russian patent published in 2003 - IPC

Abstract RU 2209127 C1

FIELD: foundry, possibly making castings of non-ferrous and precious alloys. SUBSTANCE: method comprises steps of agitating ingredients of mixture; treating prepared suspension in vacuum by means of ultrasound for time period 2 - 6 min; pouring suspension into fitting and solidifying it. Suspension is poured into fitting having openings provided with semipermeable membranes. After pouring suspension dispersion medium is pressed out of it through said openings by pressure (1,5...5)105Pa. Excess liquid phase is removed by selective forced filtration through membranes. Invention provides conditions for effective degassing of mixture. EFFECT: enhanced resistance against cracking, improved strength, high accuracy of molds and cores. 2 cl, 1 tbl, 1 ex

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RU 2 209 127 C1

Authors

Znamenskij L.G.

Dates

2003-07-27—Published

2002-09-30—Filed

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