METHOD OF EMPTYING DEGASSED MOULDS Russian patent published in 1995 - IPC

FIELD: foundry practice. SUBSTANCE: in accordance with the method the film is removed from the mould drag, the mould is placed on a grid, evacuation of the mould is stopped and the sand is knocked out from the mould, falling down at a rate which does not exceed the soaring velocity of the fine fraction of the sand, whereby the number of openings per square meter of the grid is decided by the formula. The grid remains attached to the mould drag in the course of the knocking-out operation. EFFECT: simplification of the knocking-out technique and improvement of working conditions. 3 cl