Method and apparatus for operating an injection moulding machine

摘要

An operating process for an injection moulding machine with a fixed and a moving platen which are closed by magnetic force involves (a) closing the moving platen (11) against the fixed platen(12); (b) simultaneously moving a component (31) surrounding the moving platen to within a few mm of the fixed platen; (c) locking the moving platen drive; (d) applying current to the electromagnets on the component; (e) activating electromagnets on the component and varying the electromagnetic closure force according to requirements; (f) retracting the moving platen and the component at the end of the injection cycle to allow access to the tool and simultaneously moving the component backwards relative to the moving platen. The injection moulding machine is claimed and features a component (31) which surrounds the moving tool platen (11) and has magnetic coils (39) for maintaining tool closure. A separate drive system (26) moves the component mouth (32) close to the fixed platen (12) and retracts it again for free access to the tool area (18) for demoulding.