Abstract

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.

IPC Classes  ?

• B22D 17/32 - Controlling equipment

Abstract

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.

IPC Classes  ?

• B22D 17/04 - Plunger machines
• B22D 17/26 - Mechanisms or devices for locking or opening dies
• B22D 17/32 - Controlling equipment
• B22D 17/10 - Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with horizontal press motion
• B29C 45/76 - Measuring, controlling or regulating
• H02M 7/539 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency

Abstract

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.

IPC Classes  ?

• B22D 17/10 - Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with horizontal press motion
• B22D 17/20 - AccessoriesPressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure Details
• B22D 17/32 - Controlling equipment

Abstract

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.

IPC Classes  ?

• B22D 17/32 - Controlling equipment
• G05B 1/11 - Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values fluidic
• F15B 19/00 - Testing fluid-pressure actuator systems or apparatus, so far as not provided for elsewhere

Abstract

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).

IPC Classes  ?

• B22D 17/26 - Mechanisms or devices for locking or opening dies
• B29C 45/17 - Component parts, details or accessoriesAuxiliary operations
• B29C 45/67 - Mould opening, closing or clamping devices hydraulic

Abstract

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.

IPC Classes  ?

• B22D 17/20 - AccessoriesPressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure Details
• B22D 17/04 - Plunger machines