ELECTRIC DISCHARGE MACHINE

摘要

A machining liquid is supplied to a predetermined level when a workpiece is on a table. A volume of the workpiece is obtained from a difference between the machining liquid amount at the predetermined level when a previous workpiece is not on the table, and the machining liquid amount when the workpiece is on the table. A weight of the workpiece is obtained from the obtained volume and a previously stored density of the workpiece. A weight of a mounting jig is obtained in the same procedure. A total volume of the jig and workpiece is obtained when the jig is on the table and the workpiece is fixed to the jig. The volume of the workpiece is obtained by a difference with respect to the volume of the jig. The weight of the workpiece fixed to the jig is obtained from the obtained volume and the previously stored density.

主权项

1. An electric discharge machine having a machining tank which is provided therein with a table and stores machining liquid, the table having a workpiece placed thereon, and machining the workpiece by relatively moving the table and an electrode, the electric discharge machine comprising:
a workpiece density storing section in which density of the workpiece is stored; a liquid level measuring section which measures a liquid level of the machining tank; a stored-liquid amount calculating section which mounts the workpiece in the machining tank, and which calculates a stored-liquid amount when machining liquid is stored in the machining tank until a liquid level of the machining liquid reaches a predetermined value; a volume calculating section in the machining tank calculating a volume of an amount of liquid which can be stored in the machining tank using the liquid level obtained by the liquid level measuring section when there is no workpiece in the machining tank; a workpiece volume calculating section which calculates a volume of the workpiece from a difference between values calculated by the stored-liquid amount calculating section and by the volume calculating section in the machining tank; and a workpiece weight calculating section which calculates a weight of the workpiece from the volume of the workpiece calculated by the workpiece volume calculating section using the density of the workpiece which is called up from the workpiece density storing section.