Prodn. of casting moulds by impulse compaction of wet sand - uses compressed air directed to side of pattern into mould chamber to break up prehardened sand prior to impulse compaction

摘要

Prodn. of casting moulds by impulse ompacting of wet casting mould sand using compressed air in a mould chamber (14) where a pattern (3) sits on a plate (2) above a plate support (1), has the air blown exclusively towards the side of the pattern plate support (I) into the mould chamber. At least part of the air is conducted towards this side and again out from it under impulse action. The impulse generator is positioned to the side of the pattern unit (2,3). The pattern plate support (1) has feed and extract lines (5,6) for the compressed air which under impulse action is fed via a programmable valve. The closure plate (13) forms a pressure-tight seal for the mould chamber (14) by being seated in the faces of the mould box (11), mould- or filling-frame (12). The closure plate (13) has a pressure-tight closable inlet opening for the sand in the mould chamber (14), is sand-tight but permits air to pass through passageways (4). ADVANTAGE - The system is simple in design and is not limited to any particular filling method or machine type. It enables any pre-hardening occuring during filling to be broken up.