JPS62152620A - Electric discharge machine - Google Patents

Abstract

PURPOSE:To make is possible to easily form a deep hole with the use of a thin diameter electrode, by applying pressure waves to electric discharge machining liquid from the outside of a container to circulate the liquid through the gap between the electrode and the workpiece to discharge chips. CONSTITUTION:Electrical discharge is applied to a workpiece 2 dipped in insulative electric discharge machining liquid 4 in a container 3 while an electrode 1 is rotated. A voltage is applied from an ultrasonic oscillating power source 7 to a magnetostrictive vibrator 6 disposed in a cavity formed in the lower section of the container 3. A hole 10 which is greater than the wire electrode 1 by a value corresponding to the electrical discharge gap 8 is formed, and produced chips 9 are forced to be discharged from the gap 8 by pressure waves of the magnetostrictive vibrator 6. Accordingly, it is possible to form a hole having a micro-diameter of about 100-300 microns and a depth of a value which is several times as long as the diameter thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is particularly applicable to optical fiber cores, fuel injection nozzle synthesis, fiber injection nozzles, etc., which have a fine diameter of 100 to 300 microns in diameter. The present invention relates to an electric discharge machining apparatus suitable for forming holes several times to ten times as deep as the depth of the hole.

2. Description of the Related Art Conventionally, this type of electric discharge machining equipment has been developed, for example, by
7=33922 Publication and Electrical Processing Technology Vol. g.

No. 21 (1984), configurations described in A 3 to 6 are known. Hereinafter, a conventional electrical discharge machining apparatus will be explained with reference to FIG. The cylindrical electrode 101 is rotatably provided so that holes can be formed with high precision. A power source 104 is connected to the electrode 101 and the workpiece 103 immersed in the electrical discharge machining fluid 102.
4 applies a voltage to the electrode 101 and the workpiece 103, and the discharge between them causes the electrode 10 of the workpiece 103 to
11 opposing portions are melted and removed, and a hole 106 having a diameter larger than the electrode 101 by 105 minutes of the discharge gap is machined.

Further, with reference to FIG. 3, a conventional electric discharge machining apparatus using a pond will be described. In this conventional example, a cylindrical pipe-shaped electrode 108 is used. This cylindrical pipe-shaped electrode 10
8 is the electrical discharge machining fluid flow path 1 via the rotary seal 109.
10 , and the other end of the electrical discharge machining fluid flow path 110 is open to the electrical discharge machining fluid 102 . A pump 1] 1 is provided in the middle of the electrical discharge machining fluid flow path 110. In this conventional example ζ, the electric discharge between the cylindrical pipe-shaped electrode 108 and the workpiece 103 causes the electrode 10 of the workpiece 103 to
8 is melted and removed, and a hole 106 having a diameter larger than the electrode 108 by the discharge gap 105 is machined. Furthermore, during this machining, the electrical discharge machining fluid 102 sucked up by the pump 11 flows through the flow path 110 to the rotary ring 1.
09 and is discharged from the hole 112 of the cylindrical pipe-shaped electrode 108.

Problems to be Solved by the Invention However, in the former case, during electrical discharge machining, the removed portion of the corrugated workpiece 103 becomes chips 107 and diffuses into the electrical discharge machining fluid 102, but the hole 106 gradually disappears. As the depth increases, it becomes increasingly difficult to discharge the chips 107, which accumulate in the discharge gap 105 and cause a short circuit between the electrode 101 and the workpiece 103. Therefore, normal electrical discharge is no longer performed, and machining eventually stops.

Therefore, the depth of the hole 106 that can be machined is
There were certain limits determined by the diameter of 1 and the processing energy.

In the latter case, the chips 107 are always discharged from the discharge gap 105 by the discharge machining fluid 102 discharged from the hole 112 of the electrode 108, and do not remain in the machined part. Therefore, the machining speed is increased and deep holes can be easily machined. However, when machining a hole with a diameter of 100 to 300 mm, it is necessary to reduce the diameter of the cylindrical pipe-shaped electrode 108, which makes it difficult to ensure smooth flow of the electrical discharge machining fluid 102. Also pump 111
The electrical discharge machining fluid 102 cannot be supplied unless the pressure is significantly increased. Further, the cylindrical pipe-shaped electrode 108 for drilling holes with a diameter of 100 microns or less is difficult to manufacture, and is ultimately only effective for drilling holes with a relatively large diameter.

Therefore, the present invention has a diameter of 100 to 300 microns,
It is an object of the present invention to provide an electrical discharge machining apparatus that can easily machine deep holes with a micro diameter of 100 mm or less, by simply making a groove.

Means for solving the problems The technical means of the present invention for solving the above problems are as follows:
An electrode, a container containing an insulating electrical discharge machining fluid, a workpiece housed in the container and immersed in the insulating electrical discharge machining fluid, and connected to the workpiece and the electrode to supply discharge power. A vibration source that is provided in the container and generates pressure waves in the insulated electrical discharge machining fluid, and a vibration generation power source that drives this vibration source.

According to the above-described configuration, the present invention supplies electric power to the vibration source from the vibration generating source a during electric discharge machining to generate condolence vibrations, and causes pressure waves to be caused by the insulated electric discharge machining fluid in the chamber Zh.
This pressure wave is forcibly discharged and circulated to the electrode and the discharge gear knob section during machining of the workpiece, thereby making it possible to discharge chips to the outside from the discharge cap section.

Real)ra￥tsu Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view of a main part of an electric discharge machining apparatus according to an embodiment of the present invention.

In Fig. 1, 1 is a cylindrical electrode, 2 is a workpiece,
It is fixed to the center of the upper surface of the upper bottom 3a of the container (machining tank) 3 made of an insulating material, and is immersed in the insulating electrical discharge machining liquid 4. A machining power source 5 is connected to the electrode 1 and the workpiece 2 and supplies discharge power. Reference numeral 6 denotes a magnetostrictive vibrator, which is installed in the lower space of the container 3 at the center of the lower surface of the upper base 3a. 7 is an ultrasonic oscillation power source that drives the magnetostrictive vibrator 6. In addition,
8 is a gap between the electrode 1 and the workpiece 2 that occurs during processing;
That is, the discharge gap and 9 are chips removed by machining.

Next, the operation of the above embodiment will be explained. While rotating the electrode 1, it is brought close to the workpiece 2 immersed in the insulating electrical discharge machining liquid 4 in the container 3, and a voltage is applied to the electrode 1 and the corrugated workpiece 2 by the power supply 5, and the electric discharge between them causes A hole 10 larger than the electrode 1 by 8 minutes can be machined in the workpiece 2, and the removed portion of the workpiece 2 becomes chips 9 and diffuses into the discharge machining fluid 4. At this time, the ultrasonic oscillation power source 8 is connected to the magnetostrictive vibrator 6 installed on the lower surface of the upper base 3a of the container 3
Electric power is supplied to generate minute vibrations, that is, ultrasonic waves, and pressure waves are caused in the electrical discharge machining fluid 4 in the container 3.

By appropriately selecting the direction of the magnetostrictive vibrator 6, this pressure wave can be strongly generated in the direction in which the electrode 1 and the workpiece 2 face each other.

This pressure wave discharges and circulates the electrical discharge machining fluid 4 in the discharge gap 8, and the chips 9 can be removed from the machined hole 10.

In the above embodiment, a magnetostrictive vibrator is used as a vibration source and is combined with an ultrasonic oscillation power source. However, the same effect as in the above embodiment can be obtained even if a piezoelectric vibrator is used as a vibration source. I can do it.

Effects of the Invention As is clear from the above explanation, according to the present invention, a workpiece is immersed in an insulating electrical discharge machining fluid in a container, and a vibration generating power source supplies power to a vibration source provided in the container to generate minute vibrations. This causes a pressure wave to be generated in the insulated electrical discharge machining fluid in the container, and the pressure wave of this electrical discharge machining fluid is forcibly discharged and circulated to the electrode (!:'$) in the discharge gap part in the middle of machining the workpiece. Therefore, even when drilling deep holes with a diameter of 100 to 300 microns or less than 100 microns, the chips can be reliably discharged, making it possible to easily drill holes. Since it is only necessary to provide a vibration source and a vibration generation power source for driving this vibration source, the structure can be simplified.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the main parts of an electric discharge machining apparatus according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the main parts of a conventional electric discharge machining apparatus, and Fig. 3 shows another example of the conventional electric discharge machining apparatus. FIG. 1... Electrode, 2... Workpiece, 3... Container, 4...
... Insulated electrical discharge machining fluid, 5... Power supply, 6... Magnetostrictive vibrator (vibration source) 7... Ultrasonic oscillation power supply (vibration generation power supply)
, 8... discharge gap, 9... chips, 10... machined hole. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2 Figure 3/l etc.

Claims (3)

[Claims] (1) An electrode, a container containing an insulated electrical discharge machining fluid, a workpiece housed in the container and immersed in the insulated electrical discharge machining fluid, and a discharge power source connected to the workpiece and the electrode. An electric discharge machining apparatus comprising: a power source for supplying a voltage; a vibration source provided in the container for generating pressure waves in the insulated electric discharge machining fluid; and a vibration generating power source for driving the vibration source. (2) The electric discharge machining apparatus according to claim 1, wherein the vibration source is a magnetostrictive vibrator. (3) The electric discharge machining apparatus according to claim 1, wherein the vibration source is a piezoelectric vibrator.