| 摘要 |
A wire electric discharge machine has a function of estimating the time for replacement of a filter based on a use situation for the machine. A time Tr during which the filter is serviceable is calculated according to an equation, Tr=|(Pd−Pn)/ΔP|, based on a fluid pressure variation amount ΔP, a current filter fluid pressure Pn, and a filter life pressure. A remaining available time Td for the filter which takes into account the operation rate of the machine is calculated according to an equation, Td=Tr/W. |
| 主权项 |
1. A wire electric discharge machine configured to perform electric discharge machining while jetting a machining fluid and provided with a filtration device which filters, by means of a filter, machining chips discharged by the electric discharge machining, the wire electric discharge machine comprising:
a fluid pressure detection unit disposed in a filter pipe through which the machining fluid is supplied to the filter and configured to detect a fluid pressure; a database stored with a fluid pressure variation amount of the filter per unit time corresponding to machining conditions, machining material, machining thickness, wire diameter, wire material, and machining fluid quality; a fluid pressure variation amount acquisition unit configured to acquire a current fluid pressure variation amount per unit time from the database, based on a current machining condition, machining material, machining thickness, wire diameter, wire material, and machining fluid quality; a remaining available time calculation unit configured to calculate a remaining time during which the filter is serviceable, based on the acquired fluid pressure variation amount per unit time, the current fluid pressure detected by the fluid pressure detection unit, and an upper limit value of the fluid pressure at which the filter is serviceable; a remaining day/hour calculation unit configured to calculate the number of remaining days and hours before the life of the filter is expired, based on the operation rate of the wire electric discharge machine, the remaining available time, and a current date/time; and a display unit configured to display the calculated number of remaining days and hours. |
