JP2003127029A - Method and apparatus for electric discharge machining - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for electric discharge machining by which machining accuracy is improved, and machining is speeded up, by preventing abnormal electric discharge due to generation of bubbles in machining fluid. SOLUTION: The electric discharge machining apparatus 1 having an electrode 2 and a machining table 3, on which a workpiece 4 is mounted, is provided with water vapor generating means 5 for generating vapor by vaporizing deionized water, and a nozzle 6 for spraying the vapor between the electrode 2 and the workpiece 4. Consequently, the electric discharge machining is carried out in the atmosphere of the vapor of the deionized water formed between the electrode 2 and the workpiece 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric discharge machining technique, and more particularly to an electric discharge machining in which a machining fluid forming an environment of a machining portion between an electrode and a workpiece is improved to improve machining accuracy and machining tact. The present invention relates to a method and an apparatus.

[0002]

2. Description of the Related Art Conventionally, in an electric discharge machine, in order to secure a stable electric discharge and obtain a desired machining accuracy, a machining liquid is supplied between an electrode and a workpiece to perform machining. It is also known to perform stable and high-speed processing using deionized water, which is pure water in which impurities and ions in water are almost completely removed as a liquid. That is, in the conventional electrical discharge machine, as shown in FIG. 5, the electrical discharge machining is performed in the machining fluid while flowing the deionized water 23 between the electrode 21 and the workpiece 22 during electrical discharge machining. Has been done.

[0003]

However, in the conventional electric discharge machining in deionized water, if the machining area becomes large or the number of electrodes increases, as shown in FIG.
The bubbles 24 generated by the electric discharge machining are hard to be discharged, and the abnormal discharge 25 is generated in the remaining and expanded bubbles 24, which deteriorates the machining accuracy and the electrode 21 is temporarily removed to eliminate the abnormal discharge 25. There has been a problem that the processing tact time is increased because the step of retracting and raising is performed.

In view of the above conventional problems, it is an object of the present invention to provide an electric discharge machining method and apparatus capable of preventing abnormal electric discharge due to generation of bubbles in a machining fluid to improve machining accuracy and speed up machining. .

[0005]

According to the electric discharge machining method of the present invention, electric discharge machining is carried out in a steam atmosphere in which deionized water is vaporized between the electrode and the workpiece, and the influence of bubbles in the steam atmosphere. The stable electric discharge is secured without receiving the electric shock, and high precision and high speed machining can be achieved.

Further, when vaporized deionized water vapor is sprayed and supplied between the electrode and the workpiece to remove the processing waste by the pressure of the steam, a cleaning effect on the processed surface can be obtained in addition to the above-mentioned action and effect. .

It is also possible to supply deionized water between the electrode and the work piece while the work piece is heated to vaporize the deionized water into a steam atmosphere.

Further, the electric discharge machine of the present invention is an electric discharge machine having a machining table on which an electrode and a workpiece are installed, and a steam generating means for generating steam by vaporizing deionized water, and steam. The nozzle is provided between the electrode and the portion to be processed by spraying, and the working effect of the processing method by spraying and supplying the steam can be obtained.

Further, another electric discharge machining apparatus of the present invention is an electric discharge machining apparatus comprising an electrode and a machining table on which a workpiece is placed, and a heating means for heating the workpiece on the machining table and a detaching device. Deionized water generating means for generating ionized water,
A nozzle for supplying deionized water between the electrode and the portion to be processed is provided, and the working effect of the processing method for supplying deionized water to the heated workpiece can be obtained.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) Hereinafter, a first embodiment of an electric discharge machining apparatus of the present invention will be described with reference to FIGS.
Will be described with reference to.

In FIG. 1, reference numeral 1 is an electric discharge machining apparatus in which an electrode 2 and a machining table 3 on which a workpiece 4 is placed are arranged so as to face each other. Reference numeral 5 is a steam generating means for generating steam of deionized water. The steam 7 generated by the steam generating means 5 is sprayed and supplied to the gap between the electrode 2 and the workpiece 4 by the nozzle 6, and the electric discharge machining is performed in the steam atmosphere.

In the above structure, the water vapor 7 generated from the water vapor generating means 5 is sprayed and supplied to the gap between the electrode 2 and the workpiece 4 by the nozzle 6, and as shown in FIG. The fine water droplets of 8 function as a processing medium. In that state, the electrode 2 and the workpiece 4 during machining
When a discharge is generated between the electrode 2 and the workpiece 4, the discharge energy is supplied to the workpiece 4 through the discharge column 9 extending from the electrode 2 to the workpiece 4, and the workpiece 10 melted instantaneously by the discharge energy.
As shown in FIG. 3, the water droplets 8 are cooled and solidified by the heat of vaporization when the water droplets 8 are vaporized to form the processing waste 11, and the processing waste 1
At the same time as the processing, 1 is removed from the processing portion 10 by the expansion pressure when the water droplet 8 is vaporized, and is washed away by the steam supplied by spraying and removed to the outside. Electric discharge machining proceeds by repeating this process.

(Second Embodiment) Next, a second embodiment of the electric discharge machining apparatus of the present invention will be described with reference to FIG. The same components as those of the above-described embodiment are designated by the same reference numerals, the description thereof will be omitted, and only different points will be described.

In FIG. 4, reference numeral 12 is a deionized water generating means for supplying the generated deionized water 14 so as to flow through the nozzle 13 into the gap between the electrode 2 and the workpiece 4. It is configured. The processing table 3 is provided with heating means 15 such as an electric heater for heating the workpiece 4 placed on the processing table 3.

In the above-mentioned structure, the deionized water 14 is vaporized into the water vapor 16 by pouring the deionized water 14 while the work piece 4 is heated. Supplied to the gap between the above first
Similar to the above embodiment, as shown in FIG. 2, electric discharge machining is performed in a steam atmosphere.

[0016]

As described above, according to the electric discharge machining method and apparatus of the present invention, electric discharge machining is performed in a steam atmosphere in which deionized water is vaporized between the electrode and the workpiece, so that bubbles are generated in the steam atmosphere. Stable electric discharge can be secured without being affected by the above, and the accuracy of machining can be improved, and the process of temporarily retracting the electrode to eliminate a short circuit that has occurred is not required Can be realized.

Further, when vaporized deionized water vapor is sprayed and supplied between the electrode and the workpiece to remove the machining waste by the pressure of the vapor, a cleaning effect on the machined surface can be obtained in addition to the above-mentioned effects. You can

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an electric discharge machine according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of an electric discharge machining process in the same embodiment.

FIG. 3 is an explanatory view of the action of water vapor in the same embodiment.

FIG. 4 is a schematic configuration diagram of an electric discharge machine according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram of a machining process of a conventional electrical discharge machine.

[Explanation of symbols]

1 Electric discharge machine 2 electrodes 3 processing table 4 Workpiece 5 Water vapor generating means 6 nozzles 7 Water vapor 10 Processing department 11 Processing waste 12 Deionized water generating means 13 nozzles 14 deionized water 15 Heating means 16 Water vapor

Claims (5)

[Claims] 1. A method of electrical discharge machining, characterized in that the electrical discharge machining is performed in a steam atmosphere in which deionized water is vaporized between the electrode and the workpiece. 2. The electric discharge machining method according to claim 1, wherein vaporized deionized water vapor is supplied by spraying between the electrode and the workpiece to remove machining debris at the pressure of the vapor. 3. The method according to claim 1, wherein deionized water is supplied between the electrode and the workpiece while the workpiece is heated to vaporize the deionized water into a steam atmosphere. EDM method. 4. An electric discharge machining apparatus comprising an electrode and a machining table on which a workpiece is placed, the vapor generating means for generating vapor by vaporizing deionized water, and the vapor between the electrode and the workpiece. An electric discharge machining apparatus characterized in that a nozzle for spraying and supplying the same is provided. 5. An electric discharge machine comprising a machining table on which an electrode and a workpiece are installed, the heating means heating the workpiece on the machining table, and the deionized water generating means for generating deionized water. And an electric discharge machining apparatus comprising a nozzle for supplying deionized water between the electrode and the portion to be processed.