PRESSURE DIE-CASTING MACHINE HAVING A SHUT-OFF VALVE IN THE MELT INLET CHANNEL AND OPERATING METHOD

1. Pressure die-casting machine having a shut-off valve in the melt inlet channel, and operating method. 2.1. The invention relates to a pressure die-casting machine having a casting mould (1), a casting chamber (2), a casting piston (3) which is arranged in the casting chamber so as to be axially movable, a melt inlet channel (4) leading into the casting chamber, a shut-off valve (5) in the melt inlet channel, a melt outlet channel (6) leading from the casting chamber to the casting mould, and a control unit (7) for controlling the casting piston, wherein the pressure die-casting machine is designed, for the purpose of carrying out a respective casting operation, to bring the shut-off valve into a closed position (VS) for a mould-filling phase, to control the casting piston (3) in the casting chamber (2) to advance from a casting start position into a filling end position in order to press melt material (14) via the melt outlet channel into the casting mould, and, for a subsequent refilling phase, to bring the shut-off valve into an open position and to control the casting piston to move back into the casting start position in order to supply the casting chamber with melt material via the melt inlet channel, and to an associated operating method. 2.2. The pressure die-casting machine according to the invention has a closure nozzle (19) in the melt outlet channel (6) and is further designed, in the refilling phase, to keep the closure nozzle closed and, in the mould-filling phase, with the shut-off valve (5) remaining closed, first of all to move the casting piston (3) back from the casting start position into an additional stroke position and then to advance it from the additional stroke position via the casting start position into the filling end position and at the same time to keep the closure nozzle closed while the casting piston moves back into the additional stroke position and to open it only when the casting piston advances again. 2.3. Use for example in warm-chamber pressure die-casting machine technology. 1. Machine de coulée sous pression comprenant une soupape d'arrêt dans le canal d'entrée de matière fondue, et procédé de fonctionnement. 2.1. L'invention concerne une machine de coulée sous pression comprenant un moule de coulée (1), une chambre de coulée (2), un piston de coulée (3) qui est disposé dans la chambre de coulée de manière à être axialement mobile, un canal d'entrée de matière fondue (4) débouchant dans la chambre de coulée, une