JPH02279227A - Electric discharge machining apparatus - Google Patents

Abstract

PURPOSE:To uniformly vibrate a workpiece and to simplify the work arrangement by fixing an ultrasonic vibrator to a machining table to vibrate a workpiece together with the machining table. CONSTITUTION:When an ultrasonic vibrator 9 is operated, the whole of a fixed board 3 is vibrated through a holder by the produced vibration so that a workpiece is uniformly vibrated without difference of strength of vibration. Further, a machining liquid in a cavity portion 3a of the fixed board 3 is vibrated by the vibration transmitted through the holder 5, so that vibration causes the fixed board 3 to vibrate and the vibration is transmitted to a machining liquid of a through hole 13 to vibrate a workpiece 1 disposed on the through hole 3. The vibration thus transmitted through the machining liquid is amplified by transmission through the machining liquid, and the through holes 3 are regularly disposed on the fixed board 3, so that the workpiece 2 disposed on the through holes 13 is uniformly subjected to the vibration.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electric discharge machining apparatus that performs electric discharge machining by feeding a machining electrode to a workpiece placed on a machining table immersed in machining fluid. Regarding.

[Conventional technology J Conventionally, in electric discharge machining, a workpiece is placed in an insulating liquid and a machining electrode that moves up and down by a feed control mechanism is placed above the workpiece, and a voltage is applied between the workpiece and the machining electrode. By generating a spark discharge between the electrodes, the workpiece is melted or evaporated, and the workpiece is machined into a shape that is an inversion of the shape of the machining electrode.

In this kind of electrical discharge machining, if the electrical discharge machining is continued while the molten material removed from the workpiece during electrical discharge machining remains between the workpiece and the machining electrode, secondary damage to this molten material may occur. There was a problem in that electrical discharge machining was performed, and it took time to process the material into a predetermined final shape.

In order to solve this problem, conventionally, as shown in FIG. The melt 25 and the like were dispersed from the processing section into the processing fluid 26.

[Problems to be Solved by the Invention] However, in the conventional means as described above, the ultrasonic transmitter causes vibrations of the processed part to vary in strength, so there are parts where the molten material has been removed and parts where the molten material has not been removed. This occurs, and it becomes necessary to change the machining conditions.

Furthermore, each time the processing position changes, it is necessary to move the set position of the ultrasonic transmitter, and conventionally, this transmitter has been moved manually, resulting in inefficient work setups. was there.

The present invention has been made to solve the above-mentioned problems, and it simplifies work setup by uniformly transmitting vibrations from an ultrasonic transmitter to a workpiece.
An object of the present invention is to provide an electrical discharge machining device that can speed up electrical discharge machining.

[Means for Solving Problems] In order to solve the above-mentioned problems, the electric discharge machining apparatus of the present invention provides a machining electrode for a workpiece placed on a machining table immersed in machining fluid. The electrical discharge machining apparatus is characterized in that an ultrasonic vibrator is fixed to the processing table to emit ultrasonic vibrations, thereby vibrating the workpiece together with the processing table. .

[Operation] In the above configuration, the ultrasonic vibrations emitted from the ultrasonic vibrator can directly vibrate the processing table and vibrate the entire workpiece fixed to the processing table. In this way, the workpiece is vibrated uniformly, so no matter where the workpiece is machined, there is no need to move the ultrasonic transmitter as in the conventional method. There is no difference in strength or weakness in the vibration of the machined part.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of the electric discharge machining apparatus of the present invention, and FIG. 2 is a cross-sectional view of a main part of a modification of the apparatus shown in FIG.

The electric discharge machining apparatus shown in FIG. 1 is installed in a machining tank while being immersed in machining fluid.

A holder 5 made of an insulator is attached to the upper part of the hollow support 8 through an O-ring 10 to the plate 7.
An electromagnetic surface plate 3 is fixed to the upper part of the holder 5 with screws 6. Surface plate 3
functions as a processing table, and is set to 0N by switch 12.
- It can be switched to OFF, and when a metal workpiece 2 is placed on top of it, it is turned on to attract the workpiece 2, and when the workpiece 2 after processing is taken out, it is turned off to facilitate taking out. do. Further, a hollow portion 3a is provided inside the lower part of the surface plate 3, and a plurality of holes 13 are provided to penetrate the surface plate 3 from above the hollow portion.

Therefore, the machining fluid passes through the through hole 13 into the cavity 3 of the surface plate 3.
Enter a. 4 is a cord for energizing.

A holder in the hollow part of the support column 8 of such an electrical discharge machining device.
An ultrasonic vibrator 5 is fixed to the lower part of the ultrasonic transducer 5. Since the inside of the hollow part of the support column 8 is completely sealed by the O-ring 10 as described above, the ultrasonic vibrator 9 attached therein is not immersed in the machining fluid at all, and the ultrasonic vibrator 9 is Since the insulating holder 5 electrically isolates the ultrasonic vibrator 5 from the machining current applied during machining, it is useful for protecting the ultrasonic vibrator 5.

Further, the processing electrode 1 is lowered from above the workpiece 2 toward a predetermined processing portion 2a by a feed control mechanism (not shown).

With the above configuration, when the ultrasonic vibrator 9 is activated, the resulting vibration vibrates the entire surface plate 3 via the holder 5, and the workpiece 2 vibrates uniformly without any variation in vibration strength. be able to.

In addition, the vibration transmitted to the holder 5 vibrates the machining fluid in the cavity 3a of the surface plate 3, which causes the surface plate 3 to vibrate, and
It is transmitted to the machining fluid in the through hole 13 and distributed over the through hole! The processed workpiece l is vibrated. The vibrations transmitted through the machining fluid in this way are amplified by transmitting the machining fluid, and by regularly arranging the through holes 13 on the surface plate 3, The workpiece 13 can receive vibration uniformly. Therefore, by operating the vibrator 9 during machining, the machining part 2a set at any position on the workpiece receives uniform vibrations no matter where it is, and vibrations also occur within the same machining part. There is no difference in the strength of the process, and the melt, etc. removed by processing can be uniformly dispersed in the processing fluid.

Although the above configuration uses the electromagnetic surface plate 3 as a processing table, the workpiece 2 may be placed directly on the holder 5 as shown in FIG. At this time, as described above, the support stand 14 is interposed between the workpiece 2 and the holder 5, and the vibration of the ultrasonic vibrator 9 is transmitted to the workpiece 2 via the holder 5 and the support stand 14. It is also possible to amplify and transmit the vibrations as described above via the machining fluid that has entered between the workpiece 2 and the holder 5.

In addition, the above outfit! It is also possible to connect an NC control device to the machine so that the ultrasonic vibrator can be operated automatically during processing.

Further, in the above embodiment, only one ultrasonic transducer is provided, but a plurality of ultrasonic transducers may be provided.

[Effects of the Invention] As explained above, according to the electric discharge machining apparatus of the present invention,
The ultrasonic vibrations emitted from the ultrasonic vibrator can vibrate the workpiece uniformly by directly vibrating the entire processing table. There is no need to move the ultrasonic transmitter as in
Work setup becomes easier.

In addition, since the entire workpiece can be vibrated uniformly, the molten material in the processing area is not removed unevenly, and therefore the second
The following electric discharge machining is possible, which can be used to speed up the machining process.

In addition, in the present invention, if the machining fluid is interposed between the machining table and the ultrasonic vibrator, the vibrations from the ultrasonic vibrator will be amplified and transmitted to the machining table via the machining fluid. The vibration efficiency of the object is improved, the molten material processed in the processing section is dispersed well into the processing fluid, and the processing speed can be further increased.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the electric discharge machining apparatus of the present invention, FIG. 2 is a cross-sectional view of a main part of a modified example of the apparatus shown in FIG. 1, and FIG. It is a schematic diagram. l...Processing electrode 2...Workpiece 2a...Processing section 3...Surface plate 3a...Cavity part in surface plate 4...Holder 8...Strut 9... Ultrasonic transducer 13...Through hole 14...Support stand Representative Patent attorney Johei Yamashita

Claims (2)

[Claims] (1) In an electric discharge machining device that performs electric discharge machining by feeding a machining electrode to a workpiece placed on a machining table immersed in machining fluid, an ultrasonic vibrator is fixedly installed on the machining table. An electric discharge machining apparatus characterized in that the workpiece is vibrated together with the machining table by emitting ultrasonic vibrations. (2) The electrical discharge machining apparatus according to claim 1, characterized in that a machining fluid is interposed between the machining table and the ultrasonic vibrator.