JPH0663231U - EDM electrode - Google Patents

Abstract

(57) [Abstract] [Purpose] To realize an electric discharge machining electrode that can improve machining accuracy and reduce machining time. [Structure] The electrode 1 is a cylindrical electrode having a hollow portion 1a formed therein, and cut surfaces 1b and 1c formed by cutting parallel to the axis are formed at four equally spaced side surfaces. Have These cutting surfaces 1b, 1c have a cutting allowance d1,
d2 is set to d1 <d2. Therefore, the aged machining liquid 3 in the vicinity of the machined portion can be easily discharged by performing the machining while the electrode 1 is rotated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hollow electrode for performing electric discharge machining in a state in which a machining fluid is ejected at a high pressure, and more particularly to a machining fluid discharge structure near a workpiece.

[0002]

[Prior art]

 Conventionally, for electrical discharge machining for machining a workpiece by applying a voltage between the electrode and the workpiece in the machining fluid and ejecting the machining fluid from the hollow part formed in the electrode with high pressure. The electrodes include those shown in FIGS. 13 (a), 13 (b) and 13 (c). In this figure, an electric discharge machining electrode 55 has a hollow portion 51a formed in an electrode body 51, and a machining liquid 56a such as kerosene is jetted from the hollow portion 51a toward a workpiece 53 at high pressure. It is like this. Since the inverted shape of the electric discharge machining electrode 55 is machined on the workpiece 53, a machining residue remains. An example of this improvement is shown in FIG. 13 (b), in which two hollow electrodes 52a are housed in the hollow portion 51a of the electrode body 51. Further, a gap is formed so that the machining liquid 56a can be ejected at high pressure from the hollow portion 51a and the hollow portion 52a of the electrode 52a toward the workpiece 53. In the conventional electrode 55 for electric discharge machining, as shown in FIG. 13, the gap with the work piece 53 is about 0.01 to 0.05 mm. The electric discharge machining electrode 55 is rotated so that the electric discharge phenomenon does not occur and the work 53 is not left unprocessed. At this time, the machining waste 57 is discharged from the machining portion 58 by the machining fluid 56a ejected from the electric discharge machining electrode 55.

[0003]

[Problems to be solved by the device]

 In the electric discharge machining, an electric discharge phenomenon is generated between the electric discharge machining electrode 55 and the workpiece 53 by using the machining liquid 56 as a catalyst, and the workpiece 53 can be processed by heat and pressure at that time. Therefore, if the machining waste 57 spreads in the machining fluid 56a in the vicinity of the machining portion 58, heat and pressure are not effectively transmitted to the workpiece 53, and the machining efficiency decreases. Therefore, it is preferable that the processing waste 57 does not always exist in the processed portion 58. However, since the gap between the electric discharge machining electrode 55 and the workpiece 53 is about 0.01 to 0.05 mm, the machining fluid 56a is applied from the hollow portion 51a of the electric discharge machining electrode 55 at high pressure. Even if it jets out, there is no machining fluid discharge part for discharging the aged machining fluid 56b mixed with the machining waste 57 present in the machining portion 58, so the machining dust 57 exists in the vicinity of the machining portion 58. There was a problem that improvement of processing accuracy and reduction of processing time could not be achieved as intended.

In view of the above problems, an object of the present invention is to realize an electrode for electric discharge machining which can improve machining accuracy and shorten machining time.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the means taken in the present invention is an electric discharge machining electrode for performing electric discharge machining on a workpiece in a machining liquid. It is characterized in that a machining liquid supply passage that can be supplied from the surface and a machining liquid discharge portion that discharges the machining liquid toward the base side are formed.

Here, the machining fluid discharge portion can be formed, for example, as a cut surface on the side surface of the electric discharge machining electrode from the tip side toward the base portion. In this case, it is preferable to form the cut surface at an angle that intersects the axial direction of the electric discharge machining electrode on the tip side.

Further, the machining fluid discharge portion may be formed as a machining fluid discharge groove on the side surface of the electric discharge machining electrode from the front end side toward the base portion. In this case, it is preferable to form the machining fluid discharge groove in a spiral shape. Here, the spiral machining fluid discharge groove may be formed as a recess between the linear members spirally wound around the side surface thereof.

Further, the machining fluid discharge portion can be formed as a discharge groove on the tip end surface from the opening of the machining fluid supply passage toward the outer peripheral edge.

In the present invention, it is preferable that the machining fluid discharge part is formed at an intermediate position between the tip end side and the base part.

[0010]

[Action]

 The electric discharge machining electrode of the present invention having such means is characterized in that the electrode itself is provided with a discharge part for discharging the machining liquid near the machining part of the workpiece to the base side of the electrode. Therefore, first, an electric discharge machining electrode (hereinafter, abbreviated as an electrode) is positioned so as to maintain a predetermined gap with respect to the work piece, and a voltage is applied between the electrode and the work piece to cause the electric discharge phenomenon. Cause The workpiece is gradually removed by this discharge phenomenon, and the inverted shape of the electrode is formed. The removed machining scraps are suspended in the machining fluid due to the pressure of the machining fluid ejected from the hollow part of the electrode, and try to diffuse from the vicinity of the machining part of the workpiece to the surroundings. Although the gap between the electrode and the work piece is very small, the aged machining fluid containing machining chips is easily discharged from the machining fluid discharge part formed on the electrode, so there is always a new machining fluid in the machining area. Is supplied. For this reason, the amount of machining waste existing in the machining portion is small, and the machining efficiency can be improved, so that the machining accuracy can be improved and the machining time can be shortened. In addition, when the machining fluid discharge groove is formed from the center side of the tip surface of the electrode toward the outer peripheral edge, the machining is performed with the electrode in a rotating state, so that the aged machining fluid can be efficiently discharged. However, there is no unprocessed residue. This machining groove may be formed in a spiral shape in the axial direction of the electrode. In this case, the machining fluid in the machining portion can be caused to have a vortex action, so that the aged machining fluid is discharged more effectively. It will be easy. Also, if the machining fluid discharge part is formed by a cut surface that is the axial side surface of the electrode, it is easy to machine the cut surface, and the machining fluid discharge part is wide compared to the cutting allowance. Since it can be set, the processing accuracy can be further improved and the electrode can be provided at low cost. This machining fluid discharge part is composed of a plurality of cut surfaces with different cutting allowances, and the electrode can be used in a rotating state to reliably machine the unmachined portion, and a smooth machined surface can be realized. Also, when the cut surface is formed at an angle from the tip edge of the electrode toward the base side, the base side of the electrode becomes wider even if the machining fluid discharge part of the tip end surface of the electrode is narrow. Therefore, the aged machining fluid can be discharged efficiently. If these machining fluid discharge parts are formed from the midway position of the side surface of the electrode in the axial direction, only the shape required for machining is formed on the tip surface of the electrode, and the electrode is rotated. It can be used in a stopped state.

[0011]

【Example】

 Next, an embodiment according to the present invention will be described with reference to the accompanying drawings.

[Embodiment 1] FIG. 1 is a schematic view showing a state where an electric discharge machining electrode according to Embodiment 1 of the present invention is used, and FIG. 2A shows an electric discharge machining electrode of this embodiment. A plan view, FIG. 2 (b) is a side view thereof, FIG. 3 (a) is an explanatory view showing a state in which the electric discharge machining electrode of the present example processes a workpiece, and FIG. 3 (b) is It is sectional drawing seen from the side surface direction.

In these figures, on the main body side of the electric discharge machine 30, a holding portion 21 to which a magnet 21b is fixed is provided outside a coil 21c surrounding the outer circumference of a support shaft 22. A rack gear 21d is fixed to a side surface portion of the holding portion 21 and meshes with a pinion gear (not shown) connected to the servo motor 21a, so that the support shaft 22 can be moved in the vertical direction. I am trying. Further, the tip end side of the support shaft 22 is a fixed portion 22a having a rotating member 23, and the electrode 1 is detachably fixed via this rotating member 23. The electrode 1 has a hollow portion 1a (processing liquid supply passage) for supplying the processing liquid, and the processing liquid 3 is supplied from the hollow portion 1a through a supply pipe 24 connected to a processing liquid supply source (not shown). Is ejected with a high pressure, and is rotatable about the axis by the rotating operation of the rotating member 23. On the other hand, on the machining side of the electric discharge machine 30, a tray-shaped machining liquid tank 25 for storing the machining liquid 3 is located, and on the inner bottom surface thereof, a fixing base 27 for fixing the workpiece 2 such as a high hardness material. Is provided. Then, the machining liquid 3 in the machining liquid tank 25 is adjusted according to the amount of the machining liquid 3 supplied through the electrode 1 in order to keep the water level of the machining liquid 3 in the machining liquid tank 25 constant. It is discharged from a drainage pipe 26 fixed to the bottom surface of 25, filtered by a filtering device (not shown), and then circulated to a working liquid supply source. The workpiece 2 is fixed to the fixing base 27 by the clamper 28 and the fixing bolt 29. The negative side of the power supply (not shown) is connected to the electrode 1 and the positive side of the power source (not shown) is connected to the workpiece 2 via the clamper 28, so that a voltage can be applied between the electrode 1 and the workpiece 2. It is like this. The + side of the power source may be connected to the electrode 1 and the − side of the power source may be connected to the workpiece 2 via the clamper 28.

As shown in FIG. 2, the electrode 1 of the present example is a cylindrical electrode made of copper or carbon as a material and having a hollow portion 1 a formed therein. It has cut surfaces 1b and 1c formed by being cut in a plane to the axis. These cut surfaces 1b and 1c have different cut margins d1 and d2 from the side surfaces as shown in FIG. 2A, and are set to d1 <d2. The cutting allowances d1 and d2 form a machining fluid discharge section.

In such a configuration, the electrode 1 is fixed to the support shaft 22 via the rotating member 23 of the electric discharge machine 20. In this state, the support shaft 22 is located on the upper side, and on the other hand, the workpiece 2 is fixed to the fixing base 27 by the clamper 28 and the fixing bolt 29 before the machining liquid 3 is supplied to the machining liquid tank 25. Fixed. In this state, the machining fluid 3 is supplied from the machining fluid discharge source to the machining fluid tank 25 until the machining fluid tank 25 has a predetermined capacity.

Then, a voltage is applied between the electrode 1 and the workpiece 2 from the power source to drive the servo motor 21a to lower the support shaft 22. The servomotor 22 operates until the current value between the electrode 1 and the workpiece 2 reaches the set value. This current setting value is set to a current value when the gap g between the electrode 1 and the workpiece 2 is 0.01 to 0.05 mm. As the support shaft 22 descends, the electrode 1 is moved to a position where a predetermined gap g 1 is obtained with respect to the work piece 2, and an arc transient discharge phenomenon occurs between the electrode 1 and the work piece 2. During this arc transient discharge phenomenon, a spark is generated from the electrode 1 side toward the workpiece 2 side, and the heat and pressure form a crater on the machined surface 2a of the workpiece 2. Since the spark generated by the arc transient discharge phenomenon is generated only from the surface of the tip surface 1d of the electrode 1, it is possible to form an inverted shape on the processed surface 2a, which is paired with the shape of the tip surface 1d. Therefore, when the electrode 1 is used in a stopped state, the unprocessed portion 2b is formed in a desired processed shape (circle in the drawing) as shown by the hatched portion in FIG.

Therefore, the electrode 1 is processed in a rotating state according to the rotation of the rotating member 23 provided on the support shaft 22. At this time, sparks are momentarily cut off in the unprocessed portion 2b, but the processed surface 1d of the electrode 1 immediately covers the unprocessed portion 2b, so that the processing can be performed without generating the unprocessed portion. On the other hand, in the processing state, the processing liquid 3 is jetted at high pressure from the hollow portion 1a of the electrode 1 toward the processing surface 2a. The machining chips 4 removed from the surface 2a to be machined by the heat and pressure of the spark due to the arc transient discharge phenomenon are located in the machining liquid 3 near the machining section. In a state in which a large amount of the processing waste 4 exists near the processing portion, the sparks are prevented from reaching the processing surface 2b by the processing waste 8, which causes deterioration of the processing accuracy and a longer processing time. It will be. Therefore, in order to improve the processing accuracy and shorten the processing time, it is necessary to constantly supply the fresh processing liquid 3 near the processing portion. In the case of the electrode 1 of this example, since the machining liquid discharge portion is formed by the cut surfaces 1b and 1c on the side surface, the machining waste 4 existing in the vicinity of the machining portion is freshly ejected from the hollow portion 1a of the electrode 1. Due to the jetting pressure of the machining fluid 3, the machining fluid is guided from the machining section to the machining fluid discharge section and conveyed to a position separated from the workpiece 2. Therefore, it becomes possible to constantly supply new machining liquid 3 to the vicinity of the machining portion, and the machining chips 4 can be removed quickly, so that heat and pressure due to sparks act effectively on the machining surface 2a. Therefore, it is possible to improve the processing accuracy and shorten the processing time. Further, since the cutting margins d1 and d2 of the cutting surfaces 1b and 1c are changed, a large amount of the aged machining liquid 3 is discharged from the cutting surface 1b having a large cutting margin. By using the electrode 1 in a rotating state, the cut surface 1c covers the unprocessed portion 2b of the cut surface 1b corresponding to the desired processed shape as shown in FIG. Can be precisely finished.

As described above, in the electric discharge machining electrode of the present example, the machining liquid discharge portion is constituted by the cut surfaces 1b and 1c formed by cutting the side surface to a predetermined axial length. Therefore, the aged machining liquid 3 in the vicinity of the machining portion can be quickly discharged, so that the machining accuracy can be improved and the machining time can be shortened. In this example, the cut surfaces were formed parallel to the axis on the four side surfaces of the electrode, but the number of cut surfaces is not limited, and as shown in FIGS. 4 (a) to 4 (c). The electrodes may be formed with an angle from the tip end surface of the electrode toward the base side. Furthermore, the cut surface may be formed at an intermediate position in the axial direction of the electrode.

Second Embodiment Next, an electric discharge machining electrode according to a second embodiment of the present invention will be described with reference to FIGS. 5 and 6. 5 (a) is a plan view showing an electric discharge machining electrode according to a second embodiment of the present invention, FIG. 5 (b) is a side view thereof, and FIG. 6 (a) is an electric discharge machining electrode of this embodiment. FIG. 6B is an explanatory view showing a state in which the work piece is processed, and FIG. 6B is a cross-sectional view seen from the side surface direction thereof. 5 and 6, the same parts as those of the electric discharge machining electrode of Example 1 are designated by the same reference numerals, and the description thereof will be omitted. A point to be noted in the electric discharge machining electrode (hereinafter, referred to as an electrode) 1 of the present example is the configuration of the machining fluid discharge portion formed in the electrode 1, and the electrode 1 is formed from the tip surface 1d to the side surface. It has a working fluid discharge groove 5.

As shown in FIG. 5, the electrode 1 of this example is provided with a machining fluid discharge groove 5 which is carved parallel to the axis from the tip surface 1d to a predetermined position on the side surface. . The machining liquid discharge grooves 5 are formed at four equal intervals, and these machining liquid discharge grooves 5 form a machining liquid discharge portion.

In such a configuration, the electrode 1 fixed to the spindle 22 of the electric discharge machine 20 is moved to a position where a predetermined gap g is obtained with respect to the workpiece 2 by the descending operation of the spindle 22. Be moved. In this state, a voltage is applied between the electrode 1 and the workpiece 2 to cause an arc transient discharge phenomenon and generate a spark toward the machined surface 2a. Then, the rotating member 23 of the electric discharge machine 20 is rotationally driven to bring the electrode 1 into a rotating state for processing. At this time, sparks are momentarily cut off in the unprocessed portion 2b, but since the processed surface 1d of the electrode 1 immediately covers, the unprocessed portion 2b can be processed. In the processing state, the processing waste 4 existing in the vicinity of the processing portion is agitated in the processing liquid 3 by the processing liquid 3 jetted at high pressure from the hollow portion 1a of the electrode 1 toward the processing surface 2a. To be done. Here, since the machining fluid discharge groove 5 is formed in the electrode 1, the aged machining fluid 3 containing the machining chips 4 is discharged from the machining portion near the machining section as shown in FIG. 6B. 5 and is removed from the processed part.

As described above, in the electric discharge machining electrode 1 of this example, the machining fluid discharge groove 5 cut in parallel to the axis is formed from the tip surface 1d to a predetermined position on the side surface. Therefore, since the processing waste 4 can be quickly removed from the vicinity of the processing portion, the processing accuracy can be improved and the processing time can be shortened. In this example, the machining fluid discharge groove is formed from the tip surface of the electric discharge machining electrode, but the invention is not limited to this, and the machining liquid discharge groove may be formed from an intermediate position in the axial direction of the electrode as shown in FIG. In this case, since the tip end surface of the electrode does not have an unnecessary shape for processing, there is no unprocessed portion and the electrode can be used in a stopped state.

[Third Embodiment] Next, an electric discharge machining electrode according to a third embodiment of the present invention will be described with reference to FIGS. 8 and 9. 8 (a) is a plan view showing an electric discharge machining electrode according to a third embodiment of the present invention, FIG. 8 (b) is a side view thereof, and FIG. 9 (a) shows an electric discharge machining electrode of this embodiment. FIG. 9B is an explanatory view showing a state in which the work piece is processed, and FIG. 9B is a cross-sectional view seen from the side surface direction. 8 and 9, the same parts as those of the electric discharge machining electrode of Example 1 are designated by the same reference numerals, and the description thereof will be omitted. A point to be noted in the electric discharge machining electrode (hereinafter, referred to as an electrode) 1 of the present example is the configuration of the machining fluid discharge portion formed in the electrode 1, and in the tip surface 1d of the electrode 1 from the center side thereof. The point is that the machining fluid discharge groove 6 is formed toward the outer peripheral edge.

As shown in FIG. 8, in the electrode 1 of the present example, a lateral groove 6a is formed in a cross shape from the center side of the tip surface 1d toward the outer peripheral edge, and the groove 6a is continuously formed from the forming area. The vertical groove 6b formed on the side surface of the electrode 1 constitutes the machining fluid discharge groove 6.

In such a configuration, a voltage is applied between the electrode 1 and the workpiece 2 while the electrode 1 is moved to a position where a predetermined gap g is obtained with respect to the workpiece 2, (C) A transient discharge phenomenon is generated, and a spark is generated toward the processed surface 2a. Then, the electrode 1 is rotated and processed. At this time, sparks are momentarily cut off in the unprocessed portion 2b, but since the processed surface 1d of the electrode 1 immediately covers, the unprocessed portion 2b 1 can be processed. In the processing state, the processing chips 4 present in the vicinity of the processing portion are agitated in the processing liquid 3 by the processing liquid 3 ejected at a high pressure from the hollow portion 1a of the electrode 1 toward the processing surface 2a. To be Here, as shown in FIG. 9B, the aged machining liquid 3 containing the machining waste 4 is discharged from the lateral groove 6 a formed on the tip surface 1 d of the electrode 1 to the vertical groove formed on the side surface of the electrode 1. After being flown into the groove 6b, the processing waste 4 is removed from the processing portion.

As described above, in the electric discharge machining electrode 1 of this example, the lateral groove 6a is formed in a cross shape from the center side of the tip surface 1d toward the outer peripheral edge, and the groove 6a is continuously formed from the forming area. Since the machining fluid discharge groove 6 is constituted by the vertical groove 6b formed on the side surface of the electrode 1, it becomes possible to constantly supply the new machining fluid 3 to the vicinity of the machining portion, and the machining waste 4 is removed. Since it can be performed quickly, the machining accuracy can be improved and the machining time can be shortened. Further, since the lateral groove 6a is formed in the tip surface 1d of the electrode 1, even if the gap g between the electrode 1 and the processing surface 2a is small, the aged processing liquid 3 near the processing portion can be discharged. .

Fourth Embodiment Next, an electric discharge machining electrode according to a fourth embodiment of the present invention will be described with reference to FIGS. 10 and 11. 10 (a) is a plan view showing an electric discharge machining electrode according to a fourth embodiment of the present invention, FIG. 10 (b) is a side view thereof, and FIG. 11 (a) is an electric discharge machining electrode of this embodiment. FIG. 11B is an explanatory view showing a state in which the workpiece is processed, and FIG. 11B is a cross-sectional view seen from the side direction thereof. 10 and 11, the same parts as those of the electric discharge machining electrode of Example 1 are designated by the same reference numerals, and the description thereof will be omitted. A point to be noted in the electric discharge machining electrode (hereinafter, referred to as an electrode) 1 of the present example is the configuration of the machining fluid discharge portion formed in the electrode 1, and the spiral shape is formed from the tip surface 1d to the side surface of the electrode 1. It has a spiral groove 7 formed therein.

As shown in FIG. 10, the electrode 1 of this example is provided with a spiral groove 7 formed of a spiral recess from the tip surface 1d to the side surface. The spiral groove 7 is a plurality of grooves formed by cutting the tip surface 1d from the outer peripheral edge to the central portion and maintaining the cut depth to form a spiral shape on the side surface. The discharge route is configured on the side.

In such a configuration, the electrode 1 is used in a state of being rotated in the same direction as the spiral direction of the spiral groove 7. In the processing state, the processing chips 4 present in the vicinity of the processing portion are agitated in the processing liquid 3 by the processing liquid 3 jetted at high pressure from the hollow portion 1a of the electrode 1 toward the processing surface 2a. To be done. Here, as shown in FIG. 10B, the aged machining liquid 3 containing machining scraps 4 in the vicinity of the machining portion rotates from the starting point of the machining liquid discharge groove 7 of the tip surface 1d of the electrode 1 to the rotation of the electrode 1. It moves in the spiral groove 7 according to the direction and is discharged from the vicinity of the processed portion.

As described above, in the electric discharge machining electrode 1 of this example, since the spiral groove 7 constituted by the spiral concave portion is formed from the tip surface 1d to the side surface, the machining scrap 4 near the machining portion 4 is formed. Since it can be removed quickly, the processing accuracy can be improved and the processing time can be shortened. Further, since the spiral groove 7 is formed in a spiral shape, a vortex flow is generated in the rotating direction of the electrode 1 in the processed state, and the processing waste 4 near the processed portion is efficiently discharged. In the case of this example, the spiral groove is formed by cutting in the electrode itself, but a linear member may be spirally wound around the side surface of the electrode to form a concave portion between the linear members. Further, although the spiral groove is formed from the tip end surface of the electrode, the invention is not limited to this, and the spiral groove may be formed from an intermediate position in the axial direction on the side surface of the electrode.

[0031]

As described above, the present invention is characterized in that the electric discharge machining electrode itself is provided with the machining liquid discharge part for discharging the machining liquid near the machining part to the base side of the electrode. Therefore, in this EDM electrode, the aged machining fluid containing machining scraps in the vicinity of the machining area is discharged from the tip side to the base side of the electrode through the machining fluid discharge section formed on the electrode. Since it does not block the sparks emitted from the surface, it is possible to improve the machining accuracy and shorten the machining time. In addition, if the machining fluid discharge part is formed by a cut surface obtained by cutting the side surface of the electrode in the axial direction, the machining fluid discharge part can be set wide for the cutting allowance, so the machining accuracy can be further improved. In addition to being able to do so, the electrodes can be provided at low cost. Furthermore, when the cutting surface is formed with an angle from the tip edge of the electrode toward the base side, the aged machining fluid can be efficiently discharged even if the cutting margin of the cutting surface is set to a small value. Be seen. When the machining fluid discharge groove is formed by cutting the electrode, and the machining fluid discharge groove is formed from the center side of the tip surface of the electrode toward the outer peripheral edge, Even if the gap between the electrode and the work piece is small, the aged working liquid can be easily discharged from the vicinity of the working part. Furthermore, the machining fluid discharge part may be formed in a spiral shape in the axial direction of the electrode. In this case, a swirling action can be generated in the machining fluid in the machining part, so that aged machining fluid Easier to discharge. When these processing liquid discharge parts are formed from the midway position in the axial direction on the side surface of the electrode, only the shape required for processing is formed on the tip surface of the electrode. Can be used in a stopped state.

[Brief description of drawings]

FIG. 1 is a schematic view showing a state in which an electric discharge machining electrode according to a first embodiment of the present invention is used.

FIG. 2A is a plan view showing an electric discharge machining electrode of this example, and FIG. 2B is a side view thereof.

FIG. 3A is an explanatory view showing a state in which the electric discharge machining electrode of the present example processes a workpiece, and FIG. 3B is a cross-sectional view seen from a side direction thereof.

4A is a plan view showing an example in which a cut surface of the electric discharge machining electrode of the present example is formed with an angle, and FIG. 4B is a side view thereof.

5A is a plan view showing an electric discharge machining electrode according to a second embodiment of the present invention, and FIG. 5B is a side view thereof.

FIG. 6A is an explanatory view showing a state in which the electric discharge machining electrode of the present example processes a workpiece, and FIG. 6B is a cross-sectional view seen from a side direction thereof.

FIG. 7A is a plan view showing an example in which a machining groove is formed in the electric discharge machining electrode of the present example from an intermediate position in the axial direction of the side surface of the electrode, and FIG.

FIG. 8A is a plan view showing an electric discharge machining electrode according to a third embodiment of the present invention, and FIG. 8B is a side view thereof.

FIG. 9A is an explanatory view showing a state in which the electric discharge machining electrode of the present example processes a workpiece, and FIG. 9B is a cross-sectional view seen from a side direction thereof.

10A is a plan view showing an electric discharge machining electrode according to a fourth embodiment of the present invention, and FIG. 10B is a side view thereof.

FIG. 11A is an explanatory view showing a state in which the electric discharge machining electrode of the present example processes a workpiece, and FIG. 11B is a cross-sectional view seen from a side direction thereof.

FIG. 12 is a side view showing an example in which a spiral machining liquid discharge groove is formed from an intermediate position on the side surface of the electric discharge machining electrode of the present example in the axial direction.

13A and 13B are explanatory views showing a conventional electric discharge machining electrode.

[Explanation of symbols]

 1 ... EDM electrode 1a ... Hollow part (machining liquid supply passage) 1b, 1c ... Cut surface (machining liquid discharge part) 1d ... Tip surface 2 ... Workpiece 2a ... Machining surface 2b・ ・ Remaining part 3 ・ ・ ・ Processing liquid 4 ・ ・ ・ Processing waste 5 ・ ・ ・ Processing liquid discharge groove (processing liquid discharge part) 6a ・ ・ Horizontal groove (processing liquid discharge part) 6b ・ ・ Vertical groove (processing liquid discharge) Part) 7 ... spiral groove (processing liquid discharge part)

Claims (8)

[Scope of utility model registration request] 1. An electric discharge machining electrode for performing electric discharge machining on a workpiece in a machining liquid, wherein the electric discharge machining electrode is provided with a machining liquid supply passage through which the machining liquid can be supplied from a tip surface. And a machining fluid discharge part for discharging the machining fluid toward the base side. 2. The electric discharge machining electrode according to claim 1, wherein the machining fluid discharge portion is formed as a cut surface on a side surface of the electric discharge machining electrode from a front end side toward the base portion. 3. The electric discharge machining electrode according to claim 2, wherein the cut surface is formed at an angle intersecting the axial direction of the electric discharge machining electrode on the tip side. 4. The electric discharge machining electrode according to claim 1, wherein the machining liquid discharge portion is formed as a machining liquid discharge groove on a side surface of the electric discharge machining electrode from a front end side toward the base portion. 5. The electric discharge machining electrode according to claim 4, wherein the machining fluid discharge groove is formed in a spiral shape. 6. The electric discharge machining according to claim 1, wherein the machining fluid discharge portion is formed as a machining fluid discharge groove from the opening of the machining fluid supply passage toward an outer peripheral edge of the tip surface. Electrodes. 7. The electric discharge machining electrode according to claim 6, wherein the spiral machining liquid discharge groove is formed as a recess between linear members spirally wound on a side surface thereof. 8. The electric discharge machining according to claim 1, wherein the machining fluid discharge portion is formed at an intermediate position between the tip end side and the base portion. Electrodes.