A method for electrical discharge machining a workpiece includes the steps of: presenting an elongate electrode to the workpiece with a spark gap therebetween; flowing a dielectric fluid in the gap; eroding the workpiece by electrical discharge between the tip of the electrode and the workpiece; displacing the electrode in a direction aligned with the long axis of the electrode to maintain the gap as the electrode wears and the workpiece is eroded; and simultaneously with the displacement, producing vibratory movement of the electrode, the vibratory movement being aligned with the long axis of the electrode.

An electrical discharge machining oil composition of the invention includes an organic acid metal salt and a base oil, in which the organic acid metal salt is an organic acid salt of a metal having an electronegativity on Pauling scale of 2 or less, and the present composition has a volume resistivity at 80 degrees C. of 210.sup.5 T.Math.m or more and a kinematic viscosity at 40 degrees C. in a range from 0.5 mm.sup.2/s to 10 mm.sup.2/s.

An electrical discharge machining oil composition of the invention includes an organic acid metal salt and a base oil, in which the organic acid metal salt is an organic acid salt of a metal having an electronegativity on Pauling scale of 2 or less, and the present composition has a volume resistivity at 80 degrees C. of 210.sup.5 T.Math.m or more and a kinematic viscosity at 40 degrees C. in a range from 0.5 mm.sup.2/s to 10 mm.sup.2/s.

An electrical discharge machine capable of providing a dielectric droplet and negative pressure suction, driving the dielectric droplet to flow between the EDM tool and the workpiece, allowing the EDM tool to perform nearly-dry electrical discharge machining on the workpiece through the dielectric droplet exerted from the droplet processing cavity. Additionally, the electrical discharge machine can utilize the negative pressure suction to drive debris away from the workpiece through the EDM tool, thereby enhancing debris removal efficiency, preventing the unstable discharge due to accumulation of debris on the workpiece, thereby improving electrical discharge machining efficiency and ensuring that the surface roughness, morphology, and dimensional accuracy of the machined areas of the workpiece meet the expected standards.

An electrical discharge machine capable of providing a dielectric droplet and negative pressure suction, driving the dielectric droplet to flow between the EDM tool and the workpiece, allowing the EDM tool to perform nearly-dry electrical discharge machining on the workpiece through the dielectric droplet exerted from the droplet processing cavity. Additionally, the electrical discharge machine can utilize the negative pressure suction to drive debris away from the workpiece through the EDM tool, thereby enhancing debris removal efficiency, preventing the unstable discharge due to accumulation of debris on the workpiece, thereby improving electrical discharge machining efficiency and ensuring that the surface roughness, morphology, and dimensional accuracy of the machined areas of the workpiece meet the expected standards.

A method for electrical discharge machining a workpiece includes the steps of: presenting an elongate electrode to the workpiece with a spark gap therebetween; flowing a dielectric fluid in the gap; eroding the workpiece by electrical discharge between the tip of the electrode and the workpiece; displacing the electrode in a direction aligned with the long axis of the electrode to maintain the gap as the electrode wears and the workpiece is eroded; and simultaneously with the displacement, producing vibratory movement of the electrode, the vibratory movement being aligned with the long axis of the electrode.

A method for electrical discharge machining a workpiece includes the steps of: presenting an elongate electrode to the workpiece with a spark gap therebetween; flowing a dielectric fluid in the gap; eroding the workpiece by electrical discharge between the tip of the electrode and the workpiece; displacing the electrode in a direction aligned with the long axis of the electrode to maintain the gap as the electrode wears and the workpiece is eroded; and simultaneously with the displacement, producing vibratory movement of the electrode, the vibratory movement being aligned with the long axis of the electrode.

A method of polishing a surface of an object disposed within a gas chamber is provided. The method includes filling the gas chamber with a discharging medium to a predefined pressure, applying a voltage between an electrode and the surface, calibrating a height of the electrode relative to the surface so as to establish electrical breakdown threshold criteria, and scanning the electrode with respect to the surface so as to sequentially position the electrode over a plurality of locations on the surface, each location characterized by a surface error. When a respective location in the plurality of locations has a surface error that meets the electrical breakdown threshold criteria, electrical breakdown occurs, whereby the electrical breakdown results in a discharging pulse that polishes the surface.

A method of polishing a surface of an object disposed within a gas chamber is provided. The method includes filling the gas chamber with a discharging medium to a predefined pressure, applying a voltage between an electrode and the surface, calibrating a height of the electrode relative to the surface so as to establish electrical breakdown threshold criteria, and scanning the electrode with respect to the surface so as to sequentially position the electrode over a plurality of locations on the surface, each location characterized by a surface error. When a respective location in the plurality of locations has a surface error that meets the electrical breakdown threshold criteria, electrical breakdown occurs, whereby the electrical breakdown results in a discharging pulse that polishes the surface.

An electrical discharge machine is disclosed having a concentration detection function for a rust inhibitor containing an organic compound uses coloring of a metal complex produced through the reaction of the rust inhibitor with a color reagent to enable a detector to detect the change of characteristics involved in the change of the color of the metal complex. A predetermined amount of working fluid is sampled in a sampling cell at regular time intervals, a predetermined amount of color reagent is added to the working fluid, and the change of the color of the working fluid is detected by the detector.