METHOD OF MOULD COMPACTION BY MULTIPLUNGER PRESS HEAD Russian patent published in 1996 - IPC

FIELD: foundry, in particular, in methods of manufacture of casting moulds. SUBSTANCE: projecting plungers of multiplunger head installed with the aid of a templet or according to a program in compliance with the mould shape accomplish preliminary compaction of the mould in "pockets". Locations above the moulds are not compacted, or compacted partially. The value of initial projection of plungers from the head base plane is determined according to relation between 0.7-1.2 of the difference of the mould maximum height and mould height in the point corresponding to the plunger position. After the head passes 0.3 to 0.8 of the design height of the filling frame the projecting plungers are transferred to the position of the head base plane at a rate exceeding the rate of introduction of the head into the mould by 1.2 to 5 times. Moulding sand is pressed out into cavities above the "pockets", which decreases non-uniformity of compaction. EFFECT: enhanced efficiency. 1 dwg