Degassing device and degassing method for die-casting device

Abstract

A degassing device configured to remove gas from a mold for die-casting, which includes a first path to inject molten metal into a cavity, a second path to remove gas from the cavity and a third path to measure the degree of the vacuum of the cavity. The degassing device incudes a first path opening/closing device connecting the first path and a vacuum device, a second path opening/closing device connecting the second path and the vacuum device and a controller capable of providing an actuation timing time lag between the actuation timings of the first path opening/closing device and the second path opening/closing device.

1 . (canceled) 
     
     
         2 . A degassing device configured to remove gas from a mold for die-casting, which includes a first path to inject molten metal into a cavity, a second path to remove gas from the cavity and a third path to measure a degree of vacuum of the cavity, comprising:
 a first path opening/losing device configured to connect the first path and a vacuum device and a second path opening/closing device configured to connect the second path and the vacuum device; and   an electronic controller capable of providing an actuation timing time lag between actuation timings of the first path opening/closing device and the second path opening/closing device;   the electronic controller defining a difference between a first vacuum-reaching time obtained by measuring the degree of vacuum of the cavity from the third path when the first path opening/closing device is actuated and a second vacuum-reaching time obtained by measuring the degree of vacuum of the cavity from the third path when the second path opening/closing device is actuated, as the actuation timing time lag.   
     
     
         3 . (canceled) 
     
     
         4 . (canceled) 
     
     
         5 . A degassing method for removing gas from a mold for die-casting, which includes a first path to inject molten metal into a cavity, a second path to remove gas from the cavity and a third path to measure a degree of vacuum of the cavity, the method comprising:
 obtaining a first vacuum-reaching time by measuring the degree of vacuum of the cavity, when a first path opening/closing device connecting the first path and vacuum device of a degassing device, is actuated and a second vacuum-reaching time obtained by measuring the degree of vacuum of the cavity, when a second path opening/closing device connecting the second path and the vacuum device, is actuated, comparing and determining a difference thereof to use as an actuation timing time lag; and   
       degassing by actuating the first path opening/closing device or the second path opening/closing device-first based on whether the first vacuum-reaching time and the second vacuum-reaching time is longer, and actuating the second path opening/closing device or the first path opening/closing device based on whether the second vacuum-reaching time or the first vacuum-reaching time is shorter after the actuation timing time lag has past.