METHOD FOR MAKING INVESTMENT PATTERN Russian patent published in 2004 - IPC

FIELD: machine engineering, namely casting with use of investment patterns. SUBSTANCE: method is realized by making pattern of material being powder of sodium carbonate with fraction size 0.01 - 0.4 mm clad with pattern composition. Said material contains, vol.%: pattern composition, 10 - 65%; sodium carbonate, 35 - 90%. Method comprises steps of metering material into press-mold in quantity providing manufacture of patterns with porosity degree 3 - 10%; pressing pattern material without preliminarily heating it at matching parting surfaces of press-mold; during pressing step sintering pattern material practically without phase deformation for forming open capillary porosity that compensates temperature expansion of pattern at melting it out of ceramic mold. EFFECT: enhanced accuracy of dimensions and geometry of patterns and castings.