JPS61502808A - Electrode tool for drilling holes in workpieces by electrolytic corrosion and method for drilling holes by electrolytic corrosion using this electrode tool - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Electrode tool for making holes in workpieces by electrolytic corrosion and electric power using this electrode tool Hole clearing method field of invention The present invention relates to electrolytic corrosion machining, and in particular to electrolytic corrosion drilling (electrode tools and such This invention relates to a method for drilling holes by electrolytic corrosion using a tool.

Background of the invention One problem in galvanic processing is the removal of products resulting from galvanic corrosion. This kind of life Holes with the desired depth and diameter can be easily obtained through efficient removal of the composition.

Also, it can be set up in one go, i.e. without the need for pre-treatment or post-finishing. It is also possible to obtain the shape of a part that is machined with desired precision. Machining accuracy and speed is further determined by the way in which the energy emitted from the working end of the electrode tool is concentrated. It is something. All of the above depends on the structure of the electrode tool used and the processing method used. It's even better.

Examples of methods and apparatus for removing staple products and air bubbles from the interelectrode gap For example, this is shown in West German Patent No. 1.139,359, in which the perforation is The pole is cylindrical and has an inclined passageway inside for the removal of edible products. . The entire equipment, including the workpiece to be processed, the electrode and the dielectric liquid, is placed in a closed bath. , overpressure is applied there and the liquid is forced to flow into the top between the electrode and the workpiece. The electrode product is loaded onto it and discharged through a passageway within the electrode.

However, this electric bridge structure is unsuitable for drilling small-diameter deep holes. i.e. passage The surface area of the 6i pole is considerably larger than the inlet area of the That's because there isn't. Furthermore, the depth of the hole formed is determined by the protrusion length of the channel in the electrode from the center line of the electrode. It cannot be made larger than that.

These drawbacks are explained in French patent No. 1. ．． Partially resolved by 178.722 ing. In this patent, the electrode tool is in the form of a hollow tube, and the electrode tool is in the form of a hollow tube. Electrolyte is supplied under pressure to remove electrolytic corrosion products from the gap between the electrode and the workpiece. It is designed to be taken out into the bath through the tube. The workpiece has cavities in the dielectric liquid. An oscillating motion is applied with an amplitude such that oscillations occur, thereby removing the product. It is supposed to be done. The workpieces are made to rotate at the same time.

However, this electrode structure is not suitable for large-sized 111. ffi It is unsuitable for drilling using the ffi style.

Electrical pulse fli Electricity generates evaporated components, causing a pitch due to thermoelastic stress applied to the electrode. Formation of 1- occurs. The particle size of such components increases as the discharge power increases and It increases as the pulse width becomes smaller. Therefore, as the discharge current increases, those particles It becomes stuck in the gap, causing a short circuit and the formation of staple products at the end of the electrode. It will grow. Therefore, a weak current with gentle edges is responsible for the electrolytic corrosion process. It has a positive impact on efficiency and has a positive impact on the reliability and quality of processing equipment.

Furthermore, in the above method and apparatus, the material in the part of the workpiece near the electrode wall is damaged during electrolytic corrosion processing. A protrusion is created in the center of the hole formed by removing 1 to 1.5 mm from there. Because of this tendency, it is not possible to form deep holes with large diameters.

Furthermore, the electrolytic corrosion processing apparatus shown in U.S. Pat. No. 2,718,581 has a substantially cylindrical shape. Another hollow electrode is placed symmetrically inside the hollow electrode at the same level as this electrode. Ru. This second electrode partially removes the core while leaving an unremoved portion in the center. It works like this.

When the hole becomes deep enough, the electrolytic corrosion products cannot come out from inside the internal cylindrical electrode, and the It becomes impossible to drill any further holes. Electrolytic corrosion products are caused by the gap between the walls of these electrodes. is removed along with the dielectric liquid through the cap.

However, this device has the disadvantage that it can only form shallow human-diameter holes. Also Its operation is also not reliable enough.

A prior art close to the present invention is French Patent No. 2.097.709, which According to this, the electrode tool is surrounded by a shell and has an IJ central electrode, with one pole in the center (a rectangular shape). Or the shape of a spiral rod placed on the n side of the triangle at the same level as the shell has a condition.

This central electrode has a substantially non-contact structure that does not extend beyond the centerline of the tool between the electrode and the inner surface of the shell. The spiral airoba is wound to form a heicoidal passage.

The essential drawback of this structure is that it is not efficient enough to form deep holes in the electrolytic corrosion process. This means that it is not possible. This drawback occurs in the region of large currents (and the formation of large-sized electrolytic corrosion). The object cannot be separated from the central electrode and is welded there due to the small gap between the discharge electrodes. This is because you end up doing it. On the other hand, the suspension of fixed food products reduces the density of the released energy. Concentrate the released energy in a small part of the electrode to increase the increase This affects the efficiency of the electrolytic erosion process. Also, the vortex inside the shell The wedge-shaped central electrode provides resistance to the upward flow of dielectric material carrying electrolytic corrosion products. . This causes electrolytic corrosion products to accumulate on the surface of the central electrode and block the passages in the electrode tool. become. This reduces the reliability of the device. Furthermore, the structure of the above electrode tool is The central-sovereign shape results in significant cross-sectional dimensions that make it impossible to form small-diameter holes. Ru.

In the electrolytic corrosion machining method of U.S. Pat. No. 2,902,534, the working end of the electrode tool is perform at least one combined motion in a direction different from the initial feed direction; While being shifted, the tool can now be advanced towards the workpiece being machined. There is. This working end is moved linearly towards the workpiece and therefore creates a shaped hole. For clarity, the electrode is placed around a center that is somewhat offset from the center of the working end of the electrode tool. The tool is rotated at an angle to keep the working end of the tool continuously stationary. Following that to again rotate the working end of the tool about the same center by a second predetermined angle. this All steps are repeated as many times as desired.

However, this method cannot form deep holes with small diameters. In addition, the working end is the first stage The floor returns to its original position after completion without machining the inner surface of the workpiece. Therefore, it is not possible to obtain shaped holes with acute angles or reverse directions.

The shape of the hole to be machined is determined by the shape of the tool, so the cross section of the tool is The shape of the hole shall be substantially the same as that of the hole.

Disclosure of invention The object of the present invention is to provide for holes of various depths and diameters, both through holes and center holes alike. , an electrode tool for drilling a hole in a workpiece by electrolytic corrosion, and an electric current using this electrode tool. It is to provide a clear method.

Another object of the present invention is to provide the The objective is to reliably form a hole with a cross section in the horizontal and vertical directions.

Another object of the present invention is to improve the quality of the holes formed by forming electrodes. The aim is to establish the reliability of the ingredients and increase efficiency.

The above problem consists of a central electrode made of conductive material and placed concentrically within the shell. In an electrode tool for drilling a hole in a workpiece by electrolytic corrosion, this central electric Place the pole with a gap between the shell and the working end of the shell to protrude into the applied object. This is solved by writing it as follows.

Preferably this shell is made of metal.

An insulating ting is preferably provided at a distance from the working end of this shell. stomach.

Alternatively, the shell may be formed from a dielectric material.

Preferably, the shell is tubular and the central electrode is rod-shaped, one of which is formed It must have a cross-section that corresponds to the shape of the hole to be filled.

The center electrode protrudes from the working end of the shell to the workpiece, and the set-up against the shell is more Allows the formation of deep holes.

The shell is made of metal and has no electric current applied to it, which reduces energy dissipation. Prevents flattening formation through the gap between the central electrode and the shell and between the shell and the workpiece A shield on the side of the central electrode and a Combined, the electrolytic corrosion process becomes easier. Also securely attached to the metal shell As a result, the hole is formed more accurately, ie, there is no deviation from the center.

Since the same current potential applied to the central electrode is also applied to the metal shell, the shell The material itself is added to the electrolytic erosion process, making it possible to form holes even more efficiently.

An insulating coating is applied to the metal shell, and a voltage is applied to the shell, which releases energy. is not dissipated from the sides of the shell, thus giving higher efficiency, i.e. The energy of one discharge is generated by the gap between the workpiece and the electrode or the workpiece and the shell. This is because it is released only into the gap between them.

The insulating coating applied to the shell with a small wall thickness makes it possible to form a deep hole with a small diameter. Become. It also completely eliminates accidental short circuits between the sides of the center electrode and the walls of the hole. , this also increases the efficiency and speed of hole formation and the accuracy and surface finish of electrolytic erosion machining. improve.

A deep hole and a large cross section that does not change with respect to its depth due to the tubular shell and rod-shaped central electrode etc. can be obtained.

The central electrode, which matches the shape of the shell and the hole to be machined, allows for impossible cutting to depth. Holes of various shapes with surfaces can be formed.

A central electrode protrudes from the shell to form a shaped hole with a complex longitudinal cross section. is bent at an angle α, and the end of the bent part leaves the side of the shell J Konirirudoyoi.

Also, this book allows you to move the tool or workpiece in the opposite direction. The hole-drilling method of the invention preferably involves rotating the workpiece or the central electrode.

Preferably, in the method of the invention, the shell and the central "body" are advanced individually toward the workpiece. I can't stand it.

J: If you use the method described in L, you can apply various sizes and weights H, 1 to 5 pieces to the titanium. Can make deep holes.

In addition, in the method of the present invention, the method of advancing the shell and the center electrode is individual, and the center electrode or This is done while rotating the workpiece.

This method creates substantially tubular articles that are difficult to access for galvanic processing. Deep holes can be formed in large parts or parts that are difficult to locate.

Furthermore, in order to obtain a hole shape with a reverse or acute angle, the electrode tool or workpiece may be When the electrode tool further enters the workpiece, it is almost perpendicular to its path of travel. The electrode tool or the applied Move the workpiece in the opposite direction to the initial feed to create a longitudinal direction with the opposite or acute angle of the hole. It is possible to create cross-sectional shapes.

To create a substantially round hole, the center electrode of the electrode tool or the workpiece is rotated.

Or, to increase the efficiency of electrolytic corrosion, move the electrode tool or workpiece in opposite directions. Rotate individually.

According to the method of the present invention, a hole having an arbitrary variable depth in the longitudinal direction is created. I can do it.

By using the method of the present invention, the curvature and shape of such variable shapes of the holes created are and size aill lit is 1.

As used herein, reverse or acute angle refers to the simultaneous movement of the electrode worker in a direction perpendicular to the electrode feed. In combination V with the workpiece, the initial feed of the center electrode towards the workpiece is reversed or Movement of an electrode tool with a protruding part bent at an angle α = 90° in the opposite direction Means the angle obtained in the medium workpiece.

Brief description of the drawing Fig. 1 is a cross-sectional view of the electrode tool according to the present invention, and Fig. 2 is a cross-sectional view of the electrode tool according to the present invention. Electricity when it comes! 4! A cross-sectional view showing Kanzo, Figure 3 shows that the gold kX shell has an insulating coating. FIG. 4 shows another embodiment having a dielectric shell. Figure 5 is a cross-sectional view, and Figure 5 is a perspective view showing the electrode structure when the central electrode is polygonal. Figure 6 is a perspective view showing an example in which the shell and center electrode are star-shaped, and Figure 7 is the shell and center. FIG. 8 is a perspective view showing an embodiment in which the electrode is a polyhedron with a desired angle. 9 is a sectional view showing another embodiment of the invention, and FIG. 9 is another embodiment in which a voltage is applied to the metal shell. 10 shows another embodiment in which an insulating coating is applied to the metal shell. 11 is a sectional view showing another embodiment in which the shell is made of a dielectric material, and FIG. 12 is a sectional view Another example is shown for making a slot-like hole whose cross section does not change with depth. The sectional view, Figure 13 is a top view of the electrode tool in Figure 12, Figures 14 and 15, J3 and Figure 16 shows a vertical cross-section of a throat-shaped hole defined by the bending angle of the protrusion of the central electrode. FIG. 17 is a cross-sectional view showing a slotted hole with an inverted or acute angle; Figures 18, 19, and 20 are cross-sectional views showing round holes formed by protruding bent parts, respectively. , FIG. 21 is a cross-sectional view showing a round hole with an inverted or acute angle.

The best mode of carrying out the invention The electrode tool for drilling holes by electrolytic corrosion according to the present invention has a central pole made of conductive material as pole 1 (Fig. 1). It has a nipple 3 on top of this electrode and is inserted in the middle by a sleeve 4 and a seal 5. A substantially hollow adapter 2 is fitted which is fixed to the central electrode 1.

A shell 6 is fixed to the adapter 2 on the opposite side to the sleeve 4, and a central electrical The pole 1 is surrounded by the gap ΔB, and the central electrode 1 is surrounded by the action of the shell 6. It protrudes from the end toward the workpiece 7 by a length BC.

The non-working end of the central electrode 1 is connected to means 8 for loading, feeding and adjusting the electrode tool. ing.

This electrode tool works as follows.

The working end of the central electrode 1 is placed in front of the workpiece 7 and connected to the negative end of a pulsed power source (not shown). and the workpiece 7 is connected to its positive terminal. Working end of central electrode 1 are brought close to the workpiece 7, especially to a sufficient distance that a spark will occur between them. Electrolytic corrosion of the workpiece 7 occurs in the area of the protruding part of the center pole arise. As a result, a hole 9 is formed in the workpiece 7 and passes through it and the central electrode 1 and the gap AB between the shell 6 and the gap DE between the shell 6 and the workpiece 7. Electrolytic corrosion products floating in the chamber can be easily discharged. Gya against shell 6 AB is applied and the central electrode 1 is moved from the working end of the shell 6 to the workpiece 7 being machined. The protruding structure enables more efficient discharge of electrolytic corrosion products from the processing area. each guarantees an increase in equipment capacity, improves processing quality, and reduces It becomes possible to form deep holes with a diameter of

The shell 6 can be made of metal and an electric current can be applied to it. In that case shell 6 is medium Shield the sides of central electrode 1 to prevent energy dissipation, and reduce gaps ΔB and DE. A more efficient discharge of electrolytic corrosion products is possible. Furthermore, it is fixed to adapter 2. This shell 6 ensures more accurate machining without deviation from the center of the hole.

In order to make this electrolytic corrosion process more efficient, shell 6 (Figure 2) is the negative terminal of the pulse system. connected to. In other words, the same potential as that of the central electrode 1 is applied to the shell and the shell 6 to participate in the electrolytic processing process. First, the electrolytic corrosion of the workpiece 7 occurs at the center electrode. 1 area, forming a small crater 9 in the workpiece 7. After that, electrode work The tool is fed into the workpiece and the central electrode 1 is inserted into the crater 9 thus formed. Due to the feeding, the distance between the workpiece 7 and the shell 60 decreases, creating a spacing between the workpiece and Iυ6. A leak occurs. In this way, the working end of the shell 6 becomes related to the staple food production. This results in a large hole 10 (FIG. 2).

Electrolytic erosion is prevented by feeding the electrode tool at a predetermined speed into the crater or hole being formed. The Is portion of the electrode tool, i.e. first the central electrode 1 and then the shell 6. It is hit to maintain the subsequent sequence for the hole clearing. paraphrase This results in continuous automatic self-adjustment of deep hole drilling, with the formation of a small hole followed by a large hole. Processing is performed.

To increase the efficiency and accuracy of electrolytic corrosion machining of holes of considerable depth, insulating coating 1 2 is applied to the shell 11 at a distance consisting of the working end. like this The coating is applied to the sides of the shell 6 (Figs. 1 and 2) while feeding the electrode tool deeper. This causes energy leakage, and as a result, the total length of the hole during hole machining is reduced. It is possible to introduce a pulse shape and release higher density energy at the end face of the shell 6. This is necessary in order to become unable to do so.

The operational characteristics of the shell 11 (FIG. 3) with the insulating coating 12 are energy is one, especially between the workpiece 7 and the central electrode 1 or between the workpiece and the shell 11. This means that it is released only into the gap between the two.

This increases the density of the energy released and improves the efficiency of the fruiting device. It will be done.

When forming small-diameter holes, the walls of fσ6.11 (Fig. 1.2.3) should be sufficiently thin. but this is practically unachievable if it is made of metal. . These walls may be formed of a dielectric material to meet the requirements for small diameter holes.

By using the Mffi shell shown at 13 in Figure 4, the sides and holes of the central electrode 1 can be There is no short circuit between the shell 13 and the wall, the handling of the electrode tool becomes easier, and the Hole machining can be performed using only a very limited end face portion of the protruding central electrode 1.

On the other hand, this maintains the shape of the discharge pulse over the entire length of the hole, i.e., the control Allows for flexible or programmable hole machining. The above Improves forming efficiency, speed, accuracy, surface finish of all holes and small diameter elms This allows for the formation of deep holes.

By supplying current to such an electrode tool, an electrode tool with a metal shell 6 Holes can be machined in the same way as described above.

When carrying out the above method of electrolytic corrosion hole machining with the above electrode tool, a substantially round hole In order to form a Food processing efficiency will be improved.

The length BC of the protruding part of the central electrode 1 (Fig. 1.2.3.4) is determined by its fatigue during continuous operation. The shell 6.11.13 and the central electrode 1 are individually Kanji [sent toward an object;

Next, we will discuss the structure of the preferable shell and center electrode to form the hole in the shape of the gods. Ru. To make a cylindrical hole in ``11'' with a constant cross section in the longitudinal direction, a medium The central electrode 1 (Fig. 2.3.4) is rod-shaped and the shell 6.11゜13 is tubular. It's good to do that. Such an electrode tool can convert a substantially cylindrical workpiece into a tubular one. Making parts J'3 and cylindrical parts in large or difficult to access parts locations It is possible to create a shaped hole. The shell in this case has a metal or dielectric coating. It can be made of metal or entirely dielectric.

To create a hole whose longitudinal and transverse cross-sections remain constant throughout the length of the hole, a shell and a core are used. Center? tl preferably has a cross section that matches the shape of the hole. For example, Kiriko In the case of a shaped hole 16, the shell 14 (Fig. 5) and the central electrode 15 are at an obtuse angle (or right angle). It can also be made into a polyhedron.

Alternatively, the shell 17 (Fig. 6) and the electrode 18 may be formed into a star shape to form a star-shaped hole 19. I can do it.

FIG. 7 shows another example, in which the central electrode 20 and M21 are connected to a polyhedral-shaped hole 2 with a desired angle. It has a shape that creates 2.

This electrode tool is used to form holes 16, 19, 22 (Fig. 5.6.7). Feed the pole tool, center electrode 15° 18.20, shell 14.17.21 separately from each other. Bye.

Consider another example of an electrode tool with a curved center electrode.

Such an electrode tool is made of electrically conductive material and has a substantially hollow tube with a nipple 25. The central electrode 23 (Fig. 8 ).

A shell 28 is fixed on the side opposite to the sleeve 26 and the central electrode 23 is connected to the gap AB. The central electrode 23 extends from the working end of the shell 28 to the workpiece 29. The protruding part is bent by an angle α, and the tip is connected to the shell 2. They are separated by a length of 8 sides. The angle α is 0×α×180°.

The non-working end of the central electrode 23 is connected to means 30 for loading, feeding and adjusting the electrode tool. do.

This Saneura example works as follows.

Central cylinder If! The working end of 23 is placed in front of the workpiece 29 and is connected to a pulsed current source (not shown). Connected to the negative terminal of

The working end of the central electrode 23 is close enough to the workpiece 29, in particular that sburs occur. After 4v, electrolytic corrosion of the workpiece 29 occurs in the area of the protruding part of the central electrode 23.

As a result, a crater 31 is formed in the workpiece, and the center electrode 23 and shell 28 through the gap ΔB between the shell 28 and the gaps CD and EF between the shell 28 and the two workpieces. (i) Staple food products that are in a sticky state can be easily excreted. Center electrode 23 saw The combination of the structure, the angle △B, and the bending angle α of the central electrode 23 allows Efficient publication of staple food products will be carried out, which will improve the efficiency of processing. rise

Shell 28 may be metal. Electric current can be applied alternately to this shell 28. in this case The sides of the center electrode 23 are shielded to prevent energy dissipation and to provide a gap. 1. More efficient evacuation of electrolytic corrosion products through taps AB, CD, and EF. Z. Furthermore , shell 28 ensures accurate formation of the hole without off-centering.

To make this electrolytic corrosion process even more efficient, the shell 28 (FIG. 9) It is connected to the negative terminal of the current source and has the same potential as the center electrode 23. this This causes the shell 28 to undergo an electrolytic corrosion process. First, electrolytic corrosion of the workpiece is caused by Avoid creating craters 31 on two objects. Then the electrode tool The distance between the workpiece 29 and the shell 28 is reduced so that the space between them is Causes a park. The working end of the shell 28 thus participates in the galvanic corrosion process and cleaves. data 32 is formed.

The electrolytic corrosion process is initially interrupted by feeding the electrode tool into the crater at a predetermined speed. The hole formation sequence is performed by means of the central electrode 23 and subsequently by the shell 28. is set to maintain the i.e. continuous automatic automation for deep hole drilling. Self-adjustment takes place.

In order to increase the efficiency and accuracy of deep hole drilling, an insulating coat is used when applying current to the shell 33. ting 34 is the distance from the working end of the metal shell 33. available. This coating protects the shell 28 (Fig. 8) when the electrode tool is fed deeper. ) side surface undergoes electrolytic corrosion, causing energy leakage and resulting in holes. The shape of the pulse is maintained during machining the entire length of the shell 28, or the high density energy is This is necessary because it may make it impossible to release

The operational characteristics of the shell 33 (FIG. 10) with the insulating coating 34 are Energy can be applied to one gap, especially between the workpiece 29 and the central electrode 23 or This means that it is given only between the construction shells 33. This frees up the Increases energy density and improves process efficiency.

The walls of the shell 28.33 (Fig. 8.9.10) must be thin to form a narrow slot-like hole. However, in the case of metal, it is practically impossible to do so. Ru. For this reason, the shell is preferably formed of a dielectric material.

The use of a dielectric shell 35 (FIG. 11) allows it to be formed with the sides of the central electrode The gap between the walls of the hole is completely eliminated, allowing easy handling of the electrode tool and the center electrode. Holes can be machined using the curved protrusions of 23. On the other hand, this makes the entire hole The shape of the emitted electric pulse is mixed for a long time, and the workpiece 29 is controllable or pulsed. Electrolytic corrosion processing of 1 gram is possible. All of the above improves the efficiency and speed of hole machining. Enhance and improve accuracy. It is also capable of forming deep and narrow throat-shaped holes. Ru.

The tooled hole in this example has a metal shell 28 (FIG. 8) when no current is applied. It is formed in the same way as described above.

When making a substantially round hole with the electrode tool described above, the electrode 23 can be fed into the workpiece. It's a good idea to rotate it separately from the .

The method described in Section 2 is used for forming substantially circular through holes or abutment holes of varying depths. Can be used.

Consider next the formation of holes with variable transverse and longitudinal cross-sections along the depth.

The cross-sectional shape of each hole formed is approximately determined by the bending angle α of the protrusion of the central electrode 1. Ru. The angle α is Oo × α × 180°.

By setting this angle α in advance, the dimensions of each cross section of the hole being formed and You can control the shape.

Machining a hole whose cross section changes with respect to the depth of the hole has a bending angle α as follows. This is done by the central electrode protrusion.

When the electrode tool is fed axially towards the hole, it passes through this hole.

In that case, this hole is formed into a slot with a constant cross-section with respect to depth (Section 12.1). Figure 3). To form holes with different cross-sectional shapes in terms of depth, use an electrode tool or workpiece. The object 25 (Fig. 8) is fed in the axial direction as well as in a direction approximately perpendicular to the feeding direction. Give at least one composite action. Thereby ffi & tool or workpiece 29 The perpendicular travel speed as above is greater than, less than, or the same as the axial feed. It can be. The speed of movement of two tools or workpieces in mutually orthogonal directions Depending on the ratio, a hole whose shape changes with depth can be formed in the desired shape and with a predetermined respective cross section. will be accomplished.

The shape of the hole in this case is determined by the angle α. For example, in the case of α-90”, the hole shape The shape is as shown in Figure 7, and when α is 90゛, it is as shown in Figure 15, and α〉90゛. In the case of 0°, it becomes as shown in FIG.

When forming a hole with an acute angle or a reverse direction, the protrusion of the central electrode 23 should be set at α<90”. (Fig. 17).

When the electrode tool enters the workpiece 29, move the tool or the workpiece 29 into the feed path. With its movement in the opposite direction, it starts in a direction perpendicular to the feeding direction of the i. required hole Depending on the shape and its lateral and longitudinal dimensions, machining in the direction perpendicular to the The ratio of the grinding speeds of J, J or the workpiece 29 is selected.

The formation of a substantially round hole with an acute angle that varies with depth involves the methods described above: 1. :Avoid rotating the T-shell or workpiece 29 apart from the operation. The hole obtained by this The cross section is shown in Figures 18, 19, and 20, and Figure 21 has an acute angle or a reverse angle. Shows a hole in the shape.

Rotation of the center electrode 23 (FIG. 8) relative to the workpiece 29 is suitable for large workpieces and workpieces. Achieving a substantially round hole shape in difficult to access locations on the workpiece.

If the workpiece 29 is small, it is usually X! ￥ Pole is rotated relative to the tool.

In order to increase the efficiency of this electrolytic corrosion process, both the workpiece 29 and the central ffi pole 23 are It can be rotated separately in the opposite direction.

If all of the above-mentioned pros in the staple food processing of the present invention are required, it can be repeated as many times as desired. However, even in that case, the electrode tool is set to operate at 1 o'clock.

All ribs between the workpiece and the electrode tool are relative. For example, the workpiece Up until now, it has been used in a way that the tool is kept stationary and the tool is sent in the 4J direction toward the workpiece. Really To make a circular hole, the center ffi& should also be rotated. Such methods Suitable for handling workpieces or forming holes in areas with limited access. be Alternatively, the workpiece can be moved towards a stationary tool. Also, stationary electrode tools Even if the central electrode is fatigued during the process, the quality of its protrusion can be maintained constant. The shell or central electrode may be moved to maintain the position.

In the case of circular holes, the workpiece may be rotated further relative to the stationary electrode tool.

Such a method is applicable to small workpieces J3 and workpieces in the form of tubular bar parts. Suitable for manufacturing.

Also, rotation in the opposite direction when feeding the electrode tool forward or feeding the workpiece to the tool. It is also possible to give both names. This method improves processing by increasing the eating rate. When increasing efficiency, it is especially impossible to increase the rotation speed of the central electrode or workpiece It is preferred for Noh performances.

In addition, the fatigue rate of the protruding part of the central electrode and the shell was It is also possible to select the φ) 1-crop mode that makes them equal. Such behavior is and eliminates the need for relative separate movement of the center electrode.

Industrial applicability As mentioned above, the structure of the electrode tool of the present invention and the electrolytic corrosion processing method using it can be used in various depths. The through hole with the same diameter as the blind hole J3 has a double horizontal and vertical cross section It is effective for forming holes with a certain shape and does not require pre-treatment or post-finishing. Achieves high efficiency and reliability of the electrode tool with high quality hole formation in one position. It is something that

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Claims (13)

[Claims] 1. Made of conductive material, the shells (6, 11, 13, 14, 17, 21, 18, 33, 35) with gaps within the shell (6, 11, 13, 14, 1 7, 21, 18, 33, 35) protrudes from the working end to the workpiece (7, 29) A workpiece characterized by having a central electrode (1, 15, 18, 20, 23) Electrode tool for drilling holes by electrolytic corrosion. 2. Electrode tool according to claim 1, characterized in that the shell (6, 28) is metal. 3. At a predetermined distance from the working end of the metallic shell (11, 33) Claims 1 or 3 in which an insulating coating (12, 34) is provided. or the electrode tool according to item 2. 4. Electrode tool according to claim 1, wherein the shell (13, 35) is made of dielectric material. . 5. The shells (6, 11, 13) are tubular, and the center (1) is round bar-shaped. The electrode tool according to any one of claims 1 to 4. 6. The shell (14, 17, 21) and the central electrode (15, 18, 20) are formed Any one of claims 1 to 4, which has a cross section that matches the shape of the hole to be formed. The electrode tool described in . 7. The protruding portion of the central electric plate (23) is bent at an angle α, and the bending portion so that the end of the cut part is separated from the side of the shell (28, 33, 35). An electrode worker according to any one of claims 1 to 4. 8. made of conductive material and arranged with a gap within the shell, the working end of the shell the central electrode (1, 29) or the workpiece (7, 29) protruding from the workpiece to the workpiece; are advanced toward each other so that they are rotated simultaneously. For drilling holes in a workpiece using the electrode tool described in item 1, 2, 3, 5 or 7. How to drill holes in electrolytic corrosion. 9. The shell (6, 11, 13.14, 17, 21, 28, 33, 35) and the central electric The poles (1, 15, 18, 20, 23) are individually advanced against the workpiece (7, 29). The electrode according to claim 1, 2, 3, 4, 5, 6 or 7, wherein Electrolytic corrosion drilling method for drilling holes in a workpiece using a tool. 10. The center electrodes (1, 23) or the workpieces (7, 29) are advanced relative to each other. The shell (6, 11, 13, 28, 33, 35) and the middle The central electrodes (1, 2, 3) can be advanced individually with simultaneous rotation of any of them. For drilling holes in the workpiece as set forth in claim 1, 2, 3, 5 or 7 Electrolytic corrosion drilling method. 11. The electrode tool or the workpiece according to claim 7 may include any of them. at least one resultant motion in the path of travel in a direction substantially perpendicular to the path of travel; The electrode tools are advanced relative to each other while shifting about the workpiece (29 ), the electrode tool or workpiece (29) at a certain depth will be affected by its progress. Gives the shape of a hole that is drilled with an acute or reverse angle opposite to the row direction. An electrolytic drilling method in which movement is given by speed. 12. As said central electrodes or workpieces (29) are rotated relative to each other. The electrolytic corrosion drilling method according to claim 11. 13. The center electrode (23) and the workpiece (29) are individually rotated in opposite directions. The electrolytic corrosion drilling method according to claim 11, which has been modified.