Abrégé

An injection assembly (1) of a die-casting machine comprises an injection piston (20) for which a desired speed (Vset) is defined during a metal injection step. The piston is moved by means of an injection delivery valve (104) and an injection drain valve (112), controlled in opening according to a tuning speed (Vreg). A system of auto-tuning of the opening of the valves (104,112) is provided, wherein the tuning speed (Vreg) is determined according to the difference between the desired speed (Vset) for the piston and an effective speed (Veff) of the piston, detected for the previous die-casting cycle.

Classes IPC  ?

• B22D 17/32 - Appareillage de commande

Abrégé

A hydraulic die-casting machine (1) with electric motor (39) actuated by an inverter (300), provides an energy saving evaluation system (400) with respect to a die- casting machine without inverter.

Classes IPC  ?

• B22D 17/04 - Machines à plongeur
• B22D 17/26 - Mécanismes ou dispositifs de fermeture ou d'ouverture des moules
• B22D 17/32 - Appareillage de commande
• B22D 17/10 - Machines à chambre froide, c.-à-d. dont la chambre de presse où on verse le métal liquide, n'est pas préchauffée avec mouvement horizontal de la presse
• B29C 45/76 - Mesure, commande ou régulation
• H02M 7/539 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant alternatif sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs, p. ex. onduleurs à impulsions à un seul commutateur avec commande automatique de la forme d'onde ou de la fréquence de sortie

Abrégé

An injection assembly (1) of a die casting machine comprises valve means for controlling the advancement and return of the injection piston (20) and of the multiplier piston (42). The valve means comprise a plurality of valves, including a proportional delivery valve (104), a proportional injection discharge valve (112) and a proportional multiplier valve (118). Electronic control means (300) are provided which are configured and/or programmed to execute an air purge cycle which performs the opening and closing of the valves, alternately, for a predetermined number of times.

Classes IPC  ?

• B22D 17/10 - Machines à chambre froide, c.-à-d. dont la chambre de presse où on verse le métal liquide, n'est pas préchauffée avec mouvement horizontal de la presse
• B22D 17/20 - AccessoiresCoulée sous pression ou moulage par injection, c.-à-d. moulage en introduisant le métal dans le moule sous haute pression Parties constitutives
• B22D 17/32 - Appareillage de commande

Abrégé

An injection assembly (1) of a die-casting machine is provided with electronic control means (300) of the valves, configured and programmed for carrying out a plurality of diagnostic tests on said valves. The test management program provides for the execution of a test for each valve and the comparison of parameters detected during said test with a predefined interval or with a threshold value. Furthermore, means are provided for displaying the results of the diagnostic tests.

Classes IPC  ?

• B22D 17/32 - Appareillage de commande
• G05B 1/11 - Éléments de comparaison, c.-à-d. éléments pour effectuer la comparaison directement ou indirectement entre une valeur désirée et des valeurs existantes ou prévues fluidiques
• F15B 19/00 - Test des systèmes ou appareils de manœuvre utilisant la pression d'un fluide, dans la mesure où ils ne sont pas prévus ailleurs

Abrégé

The invention concerns a die casting machine with a bedplate from which vertically extend a first fixed platen (22) holding horizontal guide columns (25), a second moving platen (23) movable on the bedplate and along the horizontal columns towards and away from the first fixed platen, and a third fixed platen (24) that forms a positive rigid support for the distal ends of the horizontal guide columns (25) and for hydraulic control actuators for the movements of the moving platen (23).

Classes IPC  ?

• B22D 17/26 - Mécanismes ou dispositifs de fermeture ou d'ouverture des moules
• B29C 45/17 - Éléments constitutifs, détails ou accessoiresOpérations auxiliaires
• B29C 45/67 - Dispositifs d'ouverture, de fermeture ou de serrage des moules hydrauliques

Abrégé

An injection system for die-casting machines comprising a liner (1 ) for a molten or semi-liquid metallic alloy and an injector piston (2) inserted coaxially in said liner (1 ) and connected to an actuator (2a) so as to impart said injector piston (2) with an alternative motion. The liner (1 ) is provided with induction and delivery ports (3, 4) of the molten alloy and said injector piston (2) is provided with one or more basically annular shaped dynamic sealing elements (5) suitable for contact with the internal surface of the liner (1 ) to prevent leaking of the alloy and consequent drops in pressure during all the die-casting process phases. The sealing elements (5) are placed stacked on the head (6) of the injector piston (2) and are made of a graphite base non-metallic material that yields under compression. The injector piston (2) is provided with axial compression means (7, 8) of the sealing elements (5) placed on a level with the head (6) of the injector piston (2) and comprising a plate (7) lodged on the free end of the sealing elements battery (5) and a screw register (8) axially connected to the injector piston (2) so as to press said plate (7) against the sealing elements battery (5) to establish a static preload in them (pθ) necessary to guarantee sealing in the minimum pressure conditions. The plate (7) is, in addition, movable axially so as to further compress the sealing elements battery (5) in an axial direction in ratio to the instantaneous injection pressure of the molten alloy.

Classes IPC  ?

• B22D 17/20 - AccessoiresCoulée sous pression ou moulage par injection, c.-à-d. moulage en introduisant le métal dans le moule sous haute pression Parties constitutives
• B22D 17/04 - Machines à plongeur