JPS6328519A - Electrode forming device for electric discharge machining - Google Patents

Abstract

PURPOSE:To make it possible to machine a fine hole with a high degree of accuracy and to form a deep hole machining electrode having different cross-sectioned shapes, by forming the outer peripheral surface of an electrode forming block adapted to be subjected to electric discharge by an opposed electrode, in a circular shape so that the electrode forming block is rotated to facilitate the machining of the electric discharge surface of the block with a high degree of accuracy. CONSTITUTION:A power source 13 is turned on while an electrode 10 formed by a rotating means 11 is moved in the direction Xa, and an electrode forming flock 3 is rotated in the direction Xb by a rotary device 4. The formation of the electrode 10 in the longitudinal direction is carried out by moving the electrode 10 in the direction Ya by a drive means 12 while the lower surface of the electrode is opposed to the upper surface of the block 3. Further, when the electrode 10 is lowered so that the forward end of the electrode is located at a predetermined position where a predetermined electric discharge gap (d) with respect to the block 3 is obtained, electric discharge is started to perform a forming process. A diametrical forming process is carried out such that the electrode 10 is positioned at one side of the block 3, and is moved in the direction Yb by a drive means 12. Therefore when the space between the electrode 10 and the block 3 has come to be a predetermined electric discharge gap, electric discharge is initiated to carry out a forming process. With this arrangement it is possible to obtain the electrode 10 having satisfactory cylindricity and circularity, and it is possible to enhance the circularity when a fine hole is machined by electric discharge.

Description

DETAILED DESCRIPTION OF THE INVENTION Fields of Industrial Application The present invention is applicable to nozzle hole machining for inkjet printers, high-precision electronic mirror apertures used in graphic displays, optical fiber connector hole machining, synthetic fiber nozzle holes, and automobile fuel. The present invention relates to an electrode forming apparatus for electric discharge machining that forms an electric discharge machining apparatus rod for electric discharge machining a minute hole such as an injection nozzle hole.

Conventional technology In recent years, there has been a strong demand for smaller hole diameters and higher precision in order to improve the performance of the equipment used to make micro holes, and electric discharge machining equipment specifically for micro hole machining has been developed. It has been put into practical use. As this conventional micro-hole electric discharge machining apparatus, the configuration described in "Electric Machining Technology" Vo18, NQ21 is known, for example.Hereinafter, with reference to the perspective view of FIG. The electrode forming device will be explained.

In FIG. 4, 101 is a container, 102 is an insulating liquid contained in the container 101, and 103 is a radio wave forming block made of an electrically conductive material, which is placed in the container 101 and immersed in the insulating liquid 102.

Reference numeral 104 denotes an electrode, which is rotated in the direction of arrow X by rotating means 105 and moved up and down in the direction of arrow Ya by driving means 106, or moved in the direction of arrow Yb, that is, the electrode forming block 1
The axis is translated in parallel to the 03 side.

A power source 107 is connected at one end to the electrode 104 and at the other end to the electrode forming block 103, and supplies electric power for discharge.

First, the power supply 107 is turned on. At the same time, the electrode 104 is rotated in the direction of arrow X by the rotating means 105. In this state, when processing the electrode 104 in the radial direction, the driving means 106 moves the electrode 104 in the Yb direction.
By maintaining an appropriate distance between the electrode forming block 103 and the electrode forming block 103, the electrode 1 is formed by electric discharge as shown in FIG. 5(a).
04 can be formed.

At this time, the discharge gap d between the electrode 104 and the electrode forming block 103 is several μm, and if left for a certain period of time, the discharge will no longer proceed. Therefore, the driving means 10
6, processing is performed by continuous or step feeding until a predetermined size is achieved.

Problems to be Solved by the Invention However, the electrode 104 used for high-precision microhole drilling of several tens of micrometers has a dimension of ±1 μm and a longitudinal taper of 1 μm.
High-precision molding of less than m is required. This accuracy is such that the shape of the electrode forming block 103 is transferred and, for example, as shown in FIG. 5(b), the electrode forming block 103 is
If the surface facing the electrode 104 in 03 and discharging is formed as an inclined surface, the electrode 104 to be formed will be tapered and funnel-shaped, allowing for high-precision hole machining with less irregularity in hole diameter, dimensions, etc. Therefore, this electrode forming block 103 has a surface that directly faces the electrode 104 and is discharged at a perpendicularity of 1 μm or less with respect to the bottom surface installed in the container 101, and the parallelism of the parallel surfaces is 1 μm or less. 2μm
There was a problem in that it required high precision machining and was not easy to manufacture.

In addition, the surface of the electrode forming block 103 that faces the electrode 104 and is directly discharged is worn away by the discharge to form a groove that follows the shape of the electrode 104, as shown in FIG. 5(c), so the number is limited. The problem was that it was only possible to process the specified quantity, and it was not effective. Further, when forming a microhole by electric discharge, discharge machining chips in the microhole by discharge machining and use an electrode with an irregular cross section to perform deep hole machining, but if the electrode 104 is formed without rotating it, The electrode 104 and the electrode forming block 103 are melted and bonded by the initial discharge, and thereafter, the discharge molding stops proceeding. Therefore, there was a problem in that only the cylindrical electrode 104 could be manufactured.

Therefore, the present invention solves the above-mentioned problems of the conventional method. It is possible to correct the accuracy of the discharge surface of the electrode molding block by self-forming processing, and it can be used repeatedly. It is possible to manufacture electrodes efficiently and easily, and it is possible to form electrodes with irregular cross-sections, such as half-moon shapes. An object of the present invention is to provide an electrode forming apparatus for electric discharge machining in which only a block for use can be easily replaced.

Means for solving the problems and the technical means of the present invention for solving the above problems include a container containing an insulating liquid, and a circular outer circumferential surface installed in the container and immersed in the insulating liquid. an electrode forming block having an electrode forming block, a rotating device that removably holds and rotates this electrode forming block, an electrode that performs electrical discharge machining with the electrode forming professional 7, and a rotation means that can stop this electrode, It is provided with a driving means for moving the electrode and the electrode forming block 7 so as to adjust the relative distance therebetween, and a power source that supplies discharge power generated between the electrode and the electrode forming block 7.

For production The effects of the above technical means are as follows.

That is, the electrode forming block is rotated by a rotating device. Next, the power is turned on, and the pseudo electrode is attached and rotated. In this state, co-printing discharge molding is performed while adjusting the relative distance between the two so that the surface of the electrode molding block facing the electrode becomes parallel to the electrode. Thereby, precision for electrode molding can be ensured. By relatively moving the electrode to be molded and the electrode molding block and adjusting the distance between them, the electrode can be molded in the longitudinal direction and the radial direction. Further, during molding, by stopping the electrode at a desired rotation angle and causing discharge, it is possible to mold an electrode with an irregular cross section such as a half-moon shape. Also, when the electrode forming block wears out, it is replaced and installed on a rotating device.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of essential parts showing an electrode forming apparatus for electric discharge machining in a first embodiment of the present invention.

In FIG. 1, 1 is a container, 2 is an insulating liquid placed in the container 1, and 3 is an electrode forming block made of an electrically conductive material. Removably attached. To explain the rotating device 4, a base 5 is installed on the bottom plate of the container 1, and a rotating part 6 made of a bearing such as a bearing is rotatably supported on the upper part of the base 6. The electrode forming block 3 is formed into a cylindrical shape, and is fitted into the small diameter portion of the upper part of the rotating part 6 and secured with screws. In addition to this, other means such as tapered press fitting, adhesive, etc. can be used as the attachment means. A motor 9 is installed on the outer surface of the side plate of the container 1.
is installed on the output shaft of this motor 9.
is installed.

A belt 7 is passed through the side plate of the container 1 and is hung between the lower end of the rotating part 6 and the boot IJB. Therefore motor 9
As a result of this drive, the rotating part 6 and the electrode forming block 3 are rotationally driven in the force direction of the arrow xb via the pulley 8 and the belt. Reference numeral 10 denotes an electrode for electrical discharge machining, which is rotated by a rotating means 11 in the direction of the arrow Xa force, and moved up and down in the direction of the arrow Ya force by a driving means, or moved in the direction of the arrow Yb, that is, parallel to the axis toward the electrode forming block 3 side. . Reference numeral 13 denotes a power source connected to the electrode 1Q and the electrode forming block 3, which also supplies power for causing discharge between the electrode 1° and the electrode forming block 3. The otherness of the power source 13 during electrode molding is opposite to that during normal processing, with the electrode 10 end being positive and the electrode molding block 3 end being negative. That is, basically, the electrode 1o can be formed and processed using the same device configuration. The shape of the electrode forming block 3 may be a cylindrical shape whose outer periphery has the same diameter in the axial direction, as shown in FIG.
As shown in Figure (b), it has a grooved cylindrical shape with an annular groove 3a on the outer periphery of the central portion. In particular, if it is formed into a grooved cylindrical shape as shown in FIG. It is easy to perform self-forming to improve accuracy, and when it is worn out,
It becomes possible to use the electrode forming block 3 upside down.

Next, the electrode forming operation according to the above embodiment will be explained. First, the power supply 13 is turned on, and the rotating means 11 rotates the molding electric field ff110 in the direction of the arrow Xa force. In addition, the electrode forming block 3 is also rotated by the rotating device 4 with the arrow
b Rotate in the force direction. Therefore, in forming the electrode 10, the second
Two directions are required: a longitudinal direction as shown in FIG. 2(b) and a radial direction as shown in FIG. 2(a). To perform longitudinal forming, as shown in FIG. 2(b), the lower surface of the electrode 1o is opposed to the upper surface of the electrode forming block 3, and the electrode 10 is
The drive means 12 moves it in the direction of arrow Ya force. Electric'f
When f110 descends and its tip reaches a predetermined discharge gap d with respect to the electrode forming block 3, electric discharge is started and forming is performed. To perform radial forming, the electrode 1o is positioned on the side of the electrode forming block 3, as shown in FIG. 2(a), and the electrode io is moved in the direction of arrow Yb from the drive means 12i. When the distance between the electrode 10 and the electrode molding block 3 reaches a predetermined discharge gap d, discharge is started and molding is performed. As a result, the electrode 10 with good cylindricity and roundness can be formed, and the roundness can be improved during electrical discharge machining of microholes.

In this way, in both the longitudinal direction and the radial direction of the electrode 10, the driving means 12 is controlled to ensure the discharge gap d between the electrode 1o and the electrode forming block 3, so that the forming process is performed continuously. However, at this time, if the surface of the electrode forming block 3 facing the electrode 10 is not installed parallel to the moving direction Ya or Yb direction,
In the radial forming, the electrode 10 is formed into a tapered shape, and when the electrode 10 is used to perform electrical discharge machining of microholes, tapered holes with different hole diameters are formed. For this reason, finishing molding, so-called self-cutting, of the discharge surface of the electrode molding block 3 is performed in advance by the driving means 12 using a pseudo electrode in accordance with the moving direction. Thereby, a surface completely parallel to the moving direction of the electrode 10 can be formed on the electrode forming block 3.

In addition, by stopping only the rotation of the electrode 10 at a desired rotation angle to generate a discharge, a notch 10a is formed in a part of the cylinder as shown in FIGS. 3(b) and (c), and the cross section is semicircular or The fan-shaped electrode 10 can be formed. With such an electrode 1o, when forming a microhole by electric discharge, chips from the electrical discharge machining inside the microhole can be discharged well, and deep machining can be performed.

Further, the discharge surface of the electrode forming block 3 with the electrode 10 is worn out and becomes inoperable after a certain amount of processing is performed. At this time,
It can be used again by performing the above-mentioned self-cutting and re-accuracy. If the limit is exceeded and the use is no longer possible, remove the worn-out electrode forming block 3 from the rotating part 6 and install a new electrode forming block 3 by screwing, press-fitting, or gluing as described above. Can be easily replaced.

In the above embodiment, the electrode 10 is fixed in the directions of the arrows Ya and Yb, and the electric sign forming block 3 and the rotating device 4 are configured to move in the direction opposite to the directions of the arrows Ya and Yb. It's okay. Alternatively, the rotating device 4 may have a motor 9 installed below the rotating section 6 to directly drive the rotating section 6 to rotate.

Effects of the Invention As is clear from the above explanation, according to the present invention, the outer circumferential surface of the electrode forming block for discharging facing the electrode is formed into a circular shape, and the electrode forming block is rotated by a rotating device. Therefore, the discharge surface of the electrode forming block can be processed easily and with high precision, and an electrode for forming microholes with high precision can be formed efficiently and easily. In addition, by stopping the electrode at a desired rotation angle and performing electric discharge, it is possible to efficiently form electrodes that can be used for deep hole machining, not only in cylindrical shapes but also in irregular cross-sectional shapes such as half-moon shapes and fan shapes with parts of the cylinders missing. be able to. Furthermore, when the electrode forming block wears out, it can be replaced.

[Brief explanation of the drawing]

1 and 2 show an electrode forming apparatus for electrical discharge machining according to an embodiment of the present invention.
) and (b) are perspective views of the main parts showing the machining operation, and Fig. 3 (
a) to (C) are perspective views showing an example of electrode forming using the device of the present invention, FIG. 4 is a perspective view of a conventional electrode forming device for electrical discharge machining, and FIG. It is an operation explanatory diagram. 1... Container, 2... Insulating liquid, 3... Electrode molding professional. 4... Rotating device, 5... Base, 6... Rotating part, 7... Belt, 8... Pulley, 9... Motor,
1o... Electrode, 11... Rotating means, 12... Driving means, 13... Power source. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2, ) (b) Figure 3 Figure 4 [to] ,'05 (o) /'

Claims (3)

[Claims] (1) A container containing an insulating liquid, an electrode forming block placed in the container and immersed in the insulating liquid and having a circular outer peripheral surface, and a rotating device that removably holds and rotates the electrode forming block. an electrode for performing electric discharge machining with the electrode forming block; a rotating means capable of stopping the electrode; a driving means for moving the electrode so as to adjust a relative distance between the electrode and the electrode forming block; 1. An electrode forming apparatus for electrical discharge machining, comprising: a power source that supplies discharge power generated between the electrode forming block and the electrode forming block. (2) The electrode forming apparatus for electrical discharge machining according to claim 1, wherein the electrode forming block has a cylindrical shape having a uniform outer diameter in the axial direction. (3) The electrode forming apparatus for electric discharge machining according to claim 1, wherein the electrode forming block has a grooved cylindrical shape having an annular groove on the outer periphery of the intermediate portion.