Die-casting machine with energy saving evaluation system

Abstract

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

1 . A die-casting machine with inverter, comprising:
 an injection assembly provided with an injection piston for pressurizing cast metal poured into a die and a hydraulic circuit for actuating the injection piston;   a hydraulic pump for feeding the hydraulic circuit through a delivery line;   an electric motor for actuating the hydraulic pump and an inverter for actuating the electric motor;   an evaluation system of the energy savings with respect to a die-casting machine without inverter, comprising:
 a) a delivery pressure sensor to detect the pump delivery pressure over a time interval; 
 b) a consumption detection device for detecting the real energy consumption of the inverter for the time interval; 
 c) a storage device wherein the data relating to the power absorbed by an electric motor without inverter for a delivery pressure are stored; 
 d) a processing device to obtain the delivery pressure from the delivery pressure sensor and the absorbed power of a predefined electric motor without an inverter for the predefined delivery pressure from the storage device to calculate an estimated energy consumption over the time interval; and 
 e) a display device for the representation of data acquired by the processing device. 
   
     
     
         2 . The die-casting machine according to  claim 1 , wherein the processing device calculate a real energy consumption of the machine with inverter and estimated power consumption of the machine without inverter for an entire processing cycle and/or at least one step of the cycle and/or at least one sub-step of the at least one step. 
     
     
         3 . The die-casting machine according to  claim 1 , comprising a closing assembly for opening and closing the die-halves forming the die, the closing assembly being hydraulically actuated by the pump. 
     
     
         4 . The die-casting machine according to  claim 2 , comprising a closing assembly for opening and closing the die-halves forming the die, actuated hydraulically by means of an additional hydraulic pump actuated by the electric motor. 
     
     
         5 . The die-casting machine according to  claim 2 , comprising
 a closing assembly for opening and closing the die-halves constituting the die, which is hydraulically actuated by an additional hydraulic pump actuated by an additional electric motor actuated by an additional inverter;   wherein an additional delivery pressure sensor detects the pressure at the delivery of the additional pump;   wherein an additional consumption detection device detect the real energy consumption of the additional inverter; and   wherein the processing device acquire the delivery pressure from the additional delivery pressure sensor, the absorbed power of a predefined additional electric motor without an inverter for the predetermined delivery pressure from the storage device and calculate an additional estimated energy consumption over the time interval.