JP2012045652A - Method of machining method of electric discharge machining electrode, and the electric discharge machining electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form an electric discharge machining electrode which is easy to center an electrode part with respect to a gripped part, can form an electric discharge electrode with high machining accuracy, and also can easily emit machining swarf when electric-discharge-machining a fine hole, a fine groove or the like.SOLUTION: A base end 11 of a rodlike workpiece W0 to be the gripped part 3 of the electric discharge machining electrode 1 is held by a chuck, and the leading edge 15 of the rodlike workpiece W0 is turned by a cutting tool 19 which is given an area forming a negative approaching angle on a lateral cutting edge 19b while suppressing thrust force, to form the fine electrode part 5 for electric discharge. A recess 9 for emitting the machining swarf is formed on an outer peripheral surface 7 of the electrode part 5.

Description

  The present invention relates to an electric discharge machining electrode machining method and an electric discharge machining electrode.

  Conventionally, there is a method described in Patent Document 1 as a method of manufacturing an electric discharge machining electrode. In this method, as shown in FIG. 24, the rod-shaped electrode main body 101 is formed as a fine axis having a uniform diameter by electric discharge machining, electrolytic machining, cutting, grinding, etc., and the outer peripheral portion of the rod-shaped electrode main body 101 is easily removed and molded. The composite structure electrode 105 is formed by covering with a clad material 103 made of a new material.

  As the clad material 103, for example, a low melting point metal, metal powder, plastic resin, transparent plastic, photo-curing resin, or low sublimation temperature material having a melting point or sublimation point lower than that of the material of the rod-shaped electrode body 101 is used.

  A part of the clad material 103 of the composite structure electrode 105 is removed to expose the rod-shaped electrode body 101 to a necessary length, and the fine electric discharge machining electrode 100 is manufactured.

  In the electric discharge machining electrode 100, when the fine hole or the fine groove is subjected to electric discharge machining while being gripped and rotated around the axis, the portion of the clad material 103 functions as a grasped portion.

  However, in this manufacturing method, since the rod-shaped electrode body 101 is coated with the clad material 103, it is difficult to center the portion of the clad material 103 that functions as the gripped portion and the electrode portion of the rod-shaped electrode body 101. It was.

  For this reason, in the electric discharge machining electrode 100 manufactured by the conventional method, there was a limit to the machining accuracy of the fine holes and the fine grooves.

  Further, since the electrode part enters the fine hole and the like as the cutting progresses, the electric discharge machining electrode 100 can appropriately discharge the machining waste from a slight gap between the electrode part and the fine hole and the like. There wasn't.

  For this reason, the normal discharge was disturbed by the processing waste staying in the fine hole or the like, and the electrode portion was severely consumed during processing.

  On the other hand, in order to avoid the consumption of the electrode part, it is necessary to cause the electric discharge machining electrode 100 to repeatedly move close to and away from the workpiece while rotating around the axis, and it is necessary to remove the machining waste. .

JP 2009-202320 A

  The problem to be solved is that it is difficult to center the electrode part with respect to the gripped part, and it is difficult to form an electric discharge machining electrode with high machining accuracy. This is the point that an electric discharge machining electrode that can be discharged could not be formed.

  The present invention provides an electric discharge machining electrode that can easily center an electrode portion with respect to a gripped portion and can form an electric discharge machining electrode with high machining accuracy and can easily discharge machining waste during electric discharge machining such as a fine hole or a fine groove. In order to form, the base end portion of the rod-shaped workpiece, which is the gripped portion of the electric discharge machining electrode, is held by the chuck, and the tip portion of the rod-shaped workpiece is cut by a cutting tool that gives the side cutting edge a portion that forms a negative approach angle. The main feature is that a fine discharge electrode part is formed by turning while suppressing the back component force, and a recess for discharging machining waste is formed on the outer peripheral surface of the electrode part.

  Further, the present invention provides a method in which the base end portion of the rod-shaped workpiece is held by a chuck, and the tip portion of the rod-shaped workpiece is turned with a back cutting force suppressed by a cutting tool provided with a portion that forms a negative approach angle on the side cutting edge. An electric discharge machining electrode machining method for forming a fine electric discharge electrode portion while the rod-shaped workpiece is grasped to form a grasped portion of the electric discharge machining electrode between the proximal end portion and the distal end portion. Part processing part, the tip part of the rod-like workpiece and the gripped part processing part are both processed by the turning process, the electrode part is formed concentrically with the gripped part, and the outer peripheral surface of the electrode part is The main feature is to form a recess for discharging machining waste.

  In the present invention, turning is performed with the base end of the rod-shaped workpiece held by the chuck, so that the electrode portion can be easily formed concentrically with the gripped portion of the electric discharge machining electrode. High electrical discharge machining electrode can be formed.

  Moreover, in this invention, the electrical discharge machining electrode which can discharge | emit the processing waste at the time of electrical discharge machining can be formed by providing a recessed part in the outer peripheral surface of an electrode part.

It is explanatory drawing which shows the processing method of an electrical discharge machining electrode (Example 1). It is explanatory drawing which shows the processing method of an electrical discharge machining electrode (Example 1). It is a principal part perspective view of the semi-finished product of an electrical discharge machining electrode (Example 1). It is a principal part top view which shows an example of a cutting tool (Example 1). It is a principal part top view which shows the other example of the cutting tool (Example 1). It is a graph which shows the value of back component force (Example 1). It is a graph which shows the value of back component force (Example 1). It is a schematic perspective view of the processing method of a recessed part (Example 1). FIG. 9 is a perspective view showing an electrode portion having a recess formed by the processing method of FIG. 8 (Example 1). FIG. 10 is a side view showing the electrode part of FIG. 9 (Example 1). FIG. 10 is a front view showing the electrode part of FIG. 9 (Example 1). It is explanatory drawing which shows the other processing method of an electrical discharge machining electrode (Example 1). It is a perspective view which shows the electrode part of the electrical discharge machining electrode formed by the processing method of FIG. 12 (Example 1). It is explanatory drawing which shows the other processing method of an electrical discharge machining electrode (Example 1). It is a perspective view which shows the electrode part of the electrical discharge machining electrode formed by the processing method of FIG. 14 (Example 1). (Example 1) which is sectional drawing which shows the micro hole by which electric discharge machining was carried out. It is a front view which shows the electrode part of the electrical discharge machining electrode which concerns on a modification (Example 1). It is a schematic side view which shows the processing method of a recessed part (Example 2). It is a perspective view which shows the electrode part provided with the recessed part by the processing method of FIG. 18 (Example 2). It is a front view which shows the electrode part of the electrical discharge machining electrode which concerns on a modification (Example 3). It is a schematic side view which shows the processing method of a recessed part (Example 3). (Example 3) which is a perspective view which shows the electrode part provided with the recessed part by the processing method of FIG. It is a front view which shows the electrode part of the electrical discharge machining electrode which concerns on a modification (Example 3). 1 schematically shows a method of manufacturing an electric discharge machining electrode, wherein (a) is a schematic cross-sectional view of a composite structure electrode in which a rod-shaped electrode body is covered with a clad material, and (b) is a composite structure electrode of (a). (C) is a schematic cross-sectional view of a state where a part of the clad material of the composite structure electrode in (b) is removed, and (d) is a schematic cross-sectional view of (c). It is a schematic perspective view of the electrical discharge machining electrode manufactured by finishing the peeling process of FIG.

  The purpose is to form an electric discharge machining electrode that can easily center the electrode portion with respect to the gripped portion and has high machining accuracy, and that can easily discharge machining scraps during electric discharge machining such as fine holes and grooves. This was realized by turning at least the electrode part while holding the base end part of the bar-shaped workpiece by the chuck, and forming a recess for discharging the machining waste in the electrode part.

[Electrical discharge machining method]
1 and 2 are explanatory views showing a method of processing an electrical discharge machining electrode according to the present embodiment.

  FIG. 1 shows a processing method in which the base end portion of the rod-shaped workpiece becomes a gripped portion of the electric discharge machining electrode, and FIG. 2 shows a processing method for processing both the gripped portion.

In the machining method of the electric discharge machining electrode 1 of the present embodiment, as shown in FIGS. 1 and 2, first, a semi-finished product T1 of the electric discharge machining electrode 1 including the gripped portion 3 and the electrode portion 5 from the rod-like workpieces W0 and W (see FIG. 3), and then a recess 9 for discharging the machining waste is formed on the outer peripheral surface 7 of the electrode portion 5.
(Processing and forming of semi-finished products)
In the processing method of FIG. 1, first, for example, the base end portion 11 of the rod-shaped workpiece W0 having a circular cross section is held by a chuck 13 of a lathe. In addition, the rod-shaped workpiece | work W0 has added the outline before a process with the dashed-two dotted line.

  Next, the fine electrode portion 5 is machined by turning while suppressing the back force by a cutting tool as a cutting tool in which the side cutting edge, which will be described later, is provided with a portion that forms a negative approach angle at the distal end portion 15 of the rod-like workpiece W0. Form. The byte is used by being attached to the byte table in advance.

  This turning process is performed within a range of the length L0 from the distal end portion 15 of the rod-shaped workpiece W0 with a cutting amount t0, and the electrode portion 5 is formed concentrically with the base end portion 11 serving as the gripped portion 3. The cutting amount t0 can be turned with, for example, a cutting tool 19 (FIG. 4) or a cutting tool 21 (FIG. 5) described later.

  Also in the processing method of FIG. 2, first, for example, the base end portion 11 of the rod-like workpiece W having a circular cross section is held by the chuck 13 of the lathe. In addition, the rod-shaped workpiece W is additionally written with a two-dot chain line in the outline before processing as described above.

  The rod-shaped workpiece W includes a gripped portion processing portion 17 between the proximal end portion 11 and the distal end portion 15. The gripped portion processing portion 17 is a portion for forming the gripped portion 3 that is gripped when used as an electric discharge machining electrode. The gripped portion processing portion 17 has a length H.

  Next, the tip portion 15 of the bar-shaped workpiece W and the gripped portion processing portion 17 are both processed by turning with a cutting tool to form the electrode portion 5 concentrically with the gripped portion 3.

  Between the distal end portion 15 of the rod-shaped workpiece W and the gripped portion processing portion 17, the gripped portion processing portion 17 is turned first. This turning process is performed within the range of the length L1 from the tip 15 with a cutting amount t1, and the gripped portion 3 is formed. Next, the tip portion 15 is turned. This turning process is performed within the range of the length L2 of the tip portion 15 with the cutting amount t2, and the electrode portion 5 is formed.

  The cut amount t2 in FIG. 2 is the same as the cut amount t0 in FIG. 1, and the length L2 in FIG. 2 is the same as the length L0 in FIG. However, these relations are the same in the description of FIG. 3, and of course, different cutting amounts and lengths may be selected and turned in FIGS. 1 and 2.

  The cutting amount t1 can be turned by, for example, a later-described cutting tool 19 (FIG. 4), and the cutting amount t2 can be turned by a later-described cutting tool 21 (FIG. 5). However, the cutting amounts t1 and t2 can be made to correspond to a single cutting tool according to the shape design of the cutting tool.

  In the processing method of FIG. 2, a concave portion 9 described later is processed and formed, and then cut along line C.

  FIG. 3 is a perspective view of an essential part of a semi-finished product of an electric discharge machining electrode.

  The semi-finished product T1 of FIG. 3 is formed by the processing method of FIG. 1 or FIG. This semi-finished product T1 includes a gripped portion 3 for gripping during electric discharge machining and the like, and an electrode portion 5 that is a fine shaft having a uniform diameter in the axial direction.

  The electrode part 5 can also be made into an axis having a diameter of 0.1 mm or less and an aspect ratio of 50 or more, for example, by using tools 19 and 21 described later.

  4 and 5 are main part plan views showing an example of a turning tool and another example, and FIGS. 6 and 7 are graphs showing values of back component force in each example.

  The cutting tools 19 and 21 which are the cutting tools of FIGS. 4 and 5 are designed by the method described in Japanese Patent Application Laid-Open No. 2009-113143, which was previously proposed by the applicant of the present application, for example.

  As shown in FIG. 4, the cutting tool 19 includes an arc-shaped nose portion 19a and a side cutting edge 19b. The side cutting edge 19b includes an inclined portion A1B1 having a negative approach angle α1 (for example, = 9 °) and a straight portion B1C1 having, for example, a zero approach angle β1.

  The inclined portion A1B1 corresponds to a range in which the cut amount is, for example, 0.91 mm, and the straight portion B1C1 corresponds to a range in which the cut amount exceeds, for example, 0.91 mm.

  Therefore, the cutting tool 13 that is a cutting tool is provided with an inclined portion A1B1 that forms a negative approach angle α1 on the side cutting edge 13b.

  As shown in FIG. 5, the cutting tool 21 includes an arc-shaped nose portion 21a and a side cutting edge 21b. The side cutting edge 21b includes a first inclined portion A2B2 forming a positive approach angle α2 (for example, = 5 °), a second inclined portion B2C2 forming a negative approach angle β2 (for example, = 11 °), and a zero approach angle, for example. It consists of a straight line portion C2D2 forming γ.

  The first inclined portion A2B2 corresponds to a range in which the cut amount is, for example, up to 0.65 mm, and the second inclined portion B2C3 corresponds to a range in which the cut amount exceeds 0.65 mm to 1.53 mm, and the straight portion C2D2 Corresponds to a range where the cutting depth exceeds 1.53 mm.

  Accordingly, the cutting tool 15 that is a cutting tool is provided with a second inclined portion B2C2 that forms a negative approach angle β2 on the side cutting edge 15b.

  When the cutting tool 19 of FIG. 4 is used, the change of the back component force with respect to the cutting depth is as shown in FIG. In FIG. 6, the back component force initially decreases with an increase in the cutting depth t, and becomes zero when it exceeds t = 0.91 mm.

  When the cutting tool 21 of FIG. 5 is used, the change of the back component force with respect to the cutting amount is as shown in FIG.

  In FIG. 7, the back component force initially increases to t = 0.65 mm with the increase of the cutting amount t, starts to decrease from t = 0.65 mm to t = 1.53 mm, and t = 1. When it exceeds 53 mm, it becomes zero.

  Therefore, in any case of using the cutting tools 19 and 21, the back component force acting on the cutting tools 19 and 21 can be made zero with a cutting amount larger than the set value. However, it is also possible to use a bite that works with some distribution power.

After the semi-finished product T1 is processed and formed as described above, a recess 9 for discharging machining waste is formed on the outer peripheral surface of the electrode portion 5 of the semi-finished product T1.
(Processing formation of recesses)
FIG. 8 is a schematic side view showing a method of processing a recess according to this embodiment.

  In the processing method of FIG. 8, the recess 9 is ground on the outer peripheral surface 7 of the electrode portion 5 of the semi-finished product T <b> 1 using the grinding wheel 23. The grinding wheel 23 is formed in a disk shape that is freely rotatable in the circumferential direction, and is disposed along the radial direction of the electrode portion 5 of the semi-finished product T1. The cutting grindstone 23 is supported so as to be able to move close to and away from the electrode portion 5 of the semi-finished product T1 and to move along the radial direction and the axial direction of the electrode portion 5.

  In the present processing method, the grinding wheel 23 is rotated and brought into contact with the outer peripheral surface 7 of the electrode portion 5 by proximity movement, and is moved in the radial direction of the electrode portion 5. By repeating this while moving in the axial direction of the electrode part 5, the recessed part 9 by grinding can be formed in the outer peripheral surface 7 of the electrode part 5.

  9 to 11 show a main part of the electric discharge machining electrode provided with a recess by the machining method of FIG. 8, FIG. 9 is a perspective view, FIG. 10 is a side view, and FIG. 11 is a front view.

As shown in FIGS. 9 to 11, the electric discharge machining electrode 1 of the present embodiment is provided with a recess 9 on the outer peripheral surface 7 on the tip end side of the electrode portion 5. The concave portion 9 is formed of a notch groove in which the distal end side is removed in a cross-sectional arc shape while leaving the base portion side of the electrode portion 5. The concave portion 9 of the present embodiment is a notch groove in which substantially half of the tip side of the electrode portion 5 is removed. However, the size of the concave portion is arbitrary and can be changed according to the amount of removal of the electrode portion 5. Further, the concave portion can be provided not only on the distal end side of the electrode portion 5 but also over the whole.
[Other electrical discharge machining electrode machining methods]
FIG. 12 is an explanatory view showing another example of a method for processing an electric discharge machining electrode.

  The processing method in FIG. 12 is basically the same as that in FIG. 1, and the same or corresponding components are denoted by the same reference numerals or the same reference signs with A and redundant description is omitted.

  That is, the machining method of FIG. 12 corresponds to the machining method of FIG. 2, and first, the tip portion 15 of the bar-shaped workpiece W and the gripped portion machining portion 17 are both machined by turning with a cutting tool. As a result, the stepped electrode portion 5A is processed concentrically with respect to the gripped portion 3 to form a semi-finished product.

  Between the distal end portion 15 of the rod-shaped workpiece W and the gripped portion processing portion 17, the gripped portion processing portion 17 is first turned with a cutting amount t1. Turning of the tip portion 15 is performed in order in the range of the cut amount t3, the length L2, the cut amount t4, and the length L3 to form the electrode portion 5A in a stepped shape with a thin tip side.

  Thereafter, by applying the machining method of FIG. 8, the recess 9A can be machined into the stepped electrode part 5A to form the electrical discharge machining electrode 1A.

  FIG. 13 is a perspective view showing an electrode portion of an electrical discharge machining electrode formed by the machining method of FIG.

  The electric discharge machining electrode 1A of FIG. 13 is a fine shaft having a different diameter in the axial direction, and is provided with a relatively large diameter base portion 5Aa and a relatively small diameter tip portion 5Ab in a stepped shape on the electrode portion 5A. . The tip portion 5Ab can have a diameter of 0.1 mm or less.

  A concave portion 9A is provided on the outer peripheral surface 7A of the electrode portion 5A. That is, the concave portion 9A is formed by notched grooves formed in the outer peripheral surfaces 7Aa and 7Ab of the base portion 5Aa and the tip portion 5Ab. The concave portion 9A extends from the distal end portion 5Ab of the electrode portion 5A to the distal end side of the base portion 5Aa.

  FIG. 14 is an explanatory view showing another example of a method for processing an electric discharge machining electrode.

  The processing method of FIG. 14 is also basically the same as that of FIG. 1, and the same or corresponding components are denoted by the same reference numerals or the same reference numerals B, and redundant description is omitted.

  That is, in the processing method of FIG. 12, first, the tip portion 15 of the bar-shaped workpiece W and the gripped portion processing portion 17 are both processed by turning using a cutting tool. Thereby, the tapered electrode portion 5B is processed concentrically with respect to the gripped portion 3, thereby forming a semi-finished product.

  The tip portion 15 of the rod-shaped workpiece W and the gripped portion processing portion 17 first turn the gripped portion processed portion 17 with a cutting amount t1. Machining of the tip 15 is performed by turning the range of the incision amount t5 and the length L2, and then gradually increasing the incision to the incision amount t6 while feeding from the end portion of the gripped portion 3 to the range of L2, thereby reducing the taper-shaped fineness. A shaft electrode portion 5B is formed.

  Thereafter, by applying the machining method shown in FIG. 8, the electrical discharge machining electrode 1B can be formed by machining the recess 9B into the tapered electrode portion 5B.

  FIG. 15 is a perspective view showing an electrode portion of an electrical discharge machining electrode formed by the machining method of FIG.

  The electric discharge machining electrode 1B in FIG. 15 is a fine axis having a different diameter in the axial direction, and the electrode portion 5B has a tapered shape. In addition, the base end of the electrode part 5B can be 0.1 mm or less in diameter.

  On the outer peripheral surface 7B of the electrode part 5B, a recess 9B made of a notch groove is formed on the tip side. The concave portion 9B gradually increases in size from the distal end side toward the proximal end side according to the tapered shape of the electrode portion 5B.

In the turning of the electric discharge machining electrodes 1A and 1B, the electrode portions 5A and 5B having different diameters can be more accurately formed by using a plurality of cutting tools 19 and 21 having different designs.
[Discharge machining of micro holes]
FIG. 16 is a cross-sectional view showing a fine hole that has been subjected to electric discharge machining by the electric discharge machining electrode of FIGS. 9, 13, and 15.

  In the present embodiment, a fine hole 29a having a uniform cross section, a stepped fine hole 29b, and a tapered fine hole 29c are formed in the workpiece 27. For the formation of the fine holes 29a to 29c, the electric discharge machining electrode 1 in FIG. 9, the electric discharge machining electrode 1A in FIG. 13, and the electric discharge machining electrode 1B in FIG. 15 are used.

  When machining the fine holes 29a to 29c, first, the gripped portion 3 of the electric discharge machining electrodes 1, 1A, 1B is held by the chuck of the electric discharge machine. Then, the electric discharge machining electrodes 1, 1 </ b> A, 1 </ b> B are moved close to the workpiece 27 while rotating around the axis, and electric discharge is performed between the electrode portions 5, 5 </ b> A, 5 </ b> B and the workpiece 17.

  By this discharge, the workpiece 27 is repeatedly melted and exploded to cut the fine holes 29a, 29b, and 29c. The cutting waste at the beginning of cutting can be discharged from a sufficient gap between the electrode parts 5, 5A, 5B and the fine holes 29a, 29b, 29c.

  As the cutting progresses, the electrode portions 5, 5A, 5B enter the fine holes 29a, 29b, 29c. At this time, a machining waste discharge path is formed by the recesses 9, 9A, 9B between the electrode portions 5, 5A, 5B and the micro holes 29a, 29b, 29c.

  For this reason, the machining waste can be discharged through the recesses 9, 9A, 9B of the electrode portions 5, 5A, 5B due to the explosion of electric discharge machining.

  After that, when the electrode portions 5, 5A, 5B penetrate the workpiece 27, minute holes 29a, 29b, 29c having a slightly larger diameter than the electrode portions 5, 5A, 5B are formed in the workpiece 27. Become.

  Thus, in the electric discharge machining electrodes 1, 1 </ b> A, 1 </ b> B, not only fine holes 29 a having a uniform diameter but also fine holes 29 b, 29 c having different diameters can be easily and accurately formed.

  In particular, the electrodes 5, 5 A, 5 B are formed concentrically with respect to the gripped portion 3 by performing turning while holding the base end portions of the rod-like workpieces W 0, W to the chuck. The extraction is performed extremely accurately, and the accuracy of the electric discharge machining of the fine holes 29a, 29b, 29c can be reliably improved.

  Further, in the electric discharge machining electrodes 1, 1 </ b> A, 1 </ b> B, machining scraps at the time of electric discharge machining can be easily and reliably discharged by the recesses 9, 9 </ b> A, 9 </ b> B serving as discharge paths. The consumption of 5A and 5B can be easily and reliably suppressed.

  Furthermore, in the electric discharge machining electrodes 1, 1 </ b> A, 1 </ b> B, since the electrode portions 5, 5 </ b> A, 5 </ b> B are centered very accurately with respect to the gripped portion 3, a machining waste discharge path by the concave portions 9, 9 </ b> A, 9 </ b> B is provided. The electrode portions 5, 5 </ b> A, and 5 </ b> B can be reliably formed over the entire circumference by rotating around the axis.

For this reason, in the electric discharge machining electrodes 1, 1 </ b> A, 1 </ b> B, it is possible to more reliably suppress the consumption of the electrode portions 5, 5 </ b> A, 5 </ b> B due to stagnation of machining waste.
[Effect of Example 1]
In the electric discharge machining electrode machining method of the present embodiment, the base end portion 11 of the rod-like workpiece W0, which becomes the gripped portion 3 of the electric discharge machining electrode 1, is held by the chuck 13, and the tip portion 15 of the rod-like workpiece W0 is moved to the side cutting edge 19b, Turning is performed while suppressing the back force by the tools 19 and 21 provided with a portion having a negative approach angle in 21b to form the electrode part 5 for fine electric discharge, and machining waste is discharged on the outer peripheral surface 7 of the electrode part 5 A recess 9 is formed.

  Further, in the electric discharge machining electrode machining method of the present embodiment, the base end portion 11 of the rod-like workpiece W is held by the chuck 13 and the tip portion 15 of the rod-like workpiece W forms a negative approach angle with the horizontal cutting edges 19b and 21b. Is a machining method of electric discharge machining electrodes 1, 1 A, 1 B for forming fine electric discharge electrode portions 5, 5 A, 5 B while turning while suppressing the back component force by means of cutting tools 19, 21. W includes a gripped portion processing portion 17 for forming the gripped portion 3 of the electric discharge machining electrodes 1, 1 </ b> A, 1 </ b> B between the base end portion 11 and the tip end portion 15, and the tip portion 15 of the rod-shaped workpiece W and the gripped portion The part machining part 17 is machined together by the above-mentioned turning process, and the electrode parts 5, 5A, 5B are formed concentrically with the gripped part 3, and machining scraps are formed on the outer peripheral surfaces 7, 7A, 7B of the electrode parts 5, 5A, 5B. Concave portions 9, 9A, 9B for discharging are formed.

  Therefore, in any machining method of the electric discharge machining electrodes 1, 1 </ b> A, 1 </ b> B, the electric discharge machining electrodes 1, 1 </ b> A, 1 </ b> B are gripped by performing turning while holding the base end 11 of the rod-shaped workpiece on the chuck 13. The electrode parts 5, 5 </ b> A, 5 </ b> B can be easily formed concentrically with the part 3.

  For this reason, in the machining method of the electric discharge machining electrodes 1, 1 </ b> A, 1 </ b> B, the electric discharge machining electrodes 1, 1 </ b> A, 1 </ b> B having high machining accuracy of the electric discharge machining of the fine holes 29 a, 29 b, 29 c can be formed.

  Further, in the processing method of the electric discharge machining electrodes 1, 1A, 1B of the present embodiment, the concave portions 9, 9A, 9B for discharging the machining waste are formed on the outer peripheral surfaces 7, 7A, 7B of the electrode portions 5, 5A, 5B. The electric discharge machining electrodes 1, 1 </ b> A, 1 </ b> B that can easily and reliably discharge the machining waste can be formed.

  In the machining method of the present embodiment, the recesses 9, 9A, 9B made of notch grooves are processed and formed in the electrode portions 5, 5A, 5B. 1A and 1B can be formed.

  In the processing method of the present embodiment, since the recesses are formed by grinding, it is possible to form the electric discharge machining electrodes 1, 1 </ b> A, 1 </ b> B that can more reliably and reliably discharge the machining waste.

  In the processing method of the present embodiment, the back component force acting on the cutting tools 19 and 21 is made zero with the cut amount greater than the set value, so that the electrode parts 5, 5 </ b> A, 5 </ b> B are more concentric with the gripped part 3. Thus, the electric discharge machining electrodes 1, 1A, 1B that can improve the electric discharge machining accuracy more reliably can be formed.

  In the processing method of the present embodiment, the electrode portions 5, 5A, 5B are formed to have uniform diameters or different diameters in the axial direction, so that they can be easily formed in the fine holes 29a, 29b, 29c having various shapes. 1, 1A and 1B can be processed and formed.

  In the machining method of the present embodiment, the electrodes 5A and 5B are formed to have different diameters in the axial direction by performing the turning using a plurality of cutting tools 19 and 21 having different designs. 5A and 5B can be formed more accurately.

  In the electric discharge machining electrodes 1, 1 </ b> A, 1 </ b> B of the present embodiment, the electrode portions 5, 5 </ b> A, 5 </ b> B are formed concentrically with the gripped portion 3, and therefore the electrode portions 5, 5 </ b> A with respect to the rotation of the gripped portion 3. , 5B can be suppressed, and the accuracy of electric discharge machining of the fine holes 29a, 29b, 29c can be reliably improved.

  Further, since the electric discharge machining electrodes 1, 1A, 1B of the present embodiment are provided with the recesses 9, 9A, 9B for discharging the machining waste on the outer peripheral surfaces 7, 7A, 7B of the electrode portions 5, 5A, 5B, Waste can be easily and reliably discharged, and consumption of the electrode parts 5, 5A, 5B can be suppressed.

  The electric discharge machining electrodes 1, 1 </ b> A, 1 </ b> B of the present embodiment are easily formed into the fine holes 29 a, 29 b, 29 c of various shapes because the electrode portions 5, 5 </ b> A, 5 </ b> B are fine shafts having a uniform diameter or different diameter in the axial direction. Can be formed.

  The electric discharge machining electrodes 1, 1 </ b> A, 1 </ b> B of the present embodiment are stepped in various shapes because the electrode portions 5 </ b> A, 5 </ b> B, which are irregularly shaped fine axes, are either stepped fine axes or tapered fine axes. The fine holes 29b and 29c having a tapered shape can be easily formed.

  FIG. 17 is a front view showing an electrode portion of an electric discharge machining electrode according to a modification. In this modification, a plurality of recesses 9C each formed of a notch groove are provided in the circumferential direction. In this modification, four recesses 9C are provided every 90 degrees. However, the number of the recesses is arbitrary and can be changed according to the size of the recesses.

  The plurality of recesses 9C may be formed by sequentially rotating the semi-finished product T1 by a predetermined angle in the circumferential direction and sequentially forming the recesses 9C in the same manner as in the above embodiment while shifting the position facing the grinding wheel 23.

  Also in this modified example, the same effects as those of the first embodiment can be obtained. In addition, in the present modification, a plurality of the concave portions 9C are formed in the circumferential direction of the electrode portion 5C, so that the machining waste can be discharged more easily and reliably, and consumption of the electrode portion 5C can be suppressed.

  FIG. 18 is a schematic side view showing a method of processing a recess according to the second embodiment of the present invention, and FIG. 19 is a perspective view showing an electrode portion having a recess by the processing method of FIG. Since the basic configuration of the present embodiment is the same as that of the first embodiment, the corresponding components are denoted by the same reference numerals or the same reference numerals with Ds and detailed description thereof is omitted.

  In this embodiment, as shown in FIG. 18, a recess 9D is cut on the outer peripheral surface 7D of the electrode portion 5D of the semi-finished product T1 using a micro end mill 26. The micro end mill 26 is formed in a columnar shape that gradually tapers toward the tip side. A cutting blade 28 is provided at the tip of the micro end mill 26. The cutting blade 28 is formed by a focused ion beam or the like.

  The micro end mill 26 is supported so as to be movable toward and away from the electrode portion 5 of the semi-finished product T1 and movable along the axial direction of the electrode portion 5.

  In the processing method of the present embodiment, the micro end mill 26 is abutted against the outer peripheral surface 7D at the distal end of the electrode portion 5D while rotating around the axis, and is moved toward the proximal end side of the electrode portion 5D. Thereby, the recessed part 9D by cutting is formed in the outer peripheral surface 7D of electrode part 5D.

  Thus, in the machining method of the electric discharge machining electrode of the present embodiment, as shown in FIG. 19, the concave portion 9D made of a concave groove having a wedge-shaped cross section is formed linearly on the electrode portion 5D of the semi-finished product T1, and the electric discharge as a finished product is performed. The processed electrode 1D can be obtained.

  In addition, if the semi-finished product T1 is rotated during the above-described processing method, the concave portion 9D formed of a spiral groove can be formed.

  According to this embodiment, even when the recess 9D is cut, the same effects as those of the first embodiment can be obtained. In addition, in this embodiment, since the recess 9D is cut by the micro end mill 26, the degree of freedom of the shape of the recess 9D can be improved.

  FIG. 20 is a front view showing an electrode portion of an electric discharge machining electrode according to a modification. In this modification, a plurality of recesses 9E are provided in the circumferential direction. In this modification, two recesses 9E are provided every 180 degrees. However, the number of the recesses is arbitrary and can be changed according to the size of the recesses.

  In order to form the plurality of recesses 9E, the semi-finished product T1 is rotated by a predetermined angle in the circumferential direction, and the recesses 9E may be sequentially formed in the same manner as in the above embodiment while shifting the position facing the micro end mill 26.

  Also in this modification, in addition to having the same effect as the second embodiment, a plurality of the recesses 9E are formed in the circumferential direction of the electrode portion 5E, so that the processing waste is more easily and reliably discharged. It is possible to suppress the consumption of the electrode part 5E.

  FIG. 21 is a schematic side view showing a method of processing a recess according to the third embodiment of the present invention, and FIG. 22 is a perspective view showing an electrode portion having a recess by the processing method of FIG. Since the basic configuration of the present embodiment is the same as that of the first embodiment, the corresponding components are denoted by the same reference numerals or the same reference numerals F, and detailed description thereof is omitted.

  In the processing method of the present embodiment, as shown in FIG. 21, the recess 9 </ b> F is laser processed on the outer peripheral surface 7 </ b> F of the electrode portion 5 </ b> F of the semi-finished product T <b> 1 using the laser irradiation unit 25. The laser irradiation part 25 is supported so as to be movable along the axial direction of the electrode part 5F of the semi-finished product T1, and is capable of laser irradiation toward the outer peripheral surface 7F of the electrode part 5F.

  In this processing method, the laser irradiation unit 25 is disposed on the tip of the electrode unit 5F of the semi-finished product T1, and the laser irradiation unit 25 is moved to the base end side of the electrode unit 5F while irradiating the laser in this state. Thereby, the recessed part 9F by laser irradiation is formed in the outer peripheral surface 7F of the electrode part 5F.

  Thereafter, the semi-finished product T1 is rotated by a predetermined angle in the circumferential direction, and the concave portions 9F are sequentially formed in the same manner as described above while shifting the position facing the laser irradiation unit 25.

  As a result, in the processing method of the present embodiment, as shown in FIG. 22, a plurality of linear recesses 9F are formed in the circumferential direction on the electrode portion 5F of the semi-finished product T1 to obtain the electric discharge machining electrode 1F as a finished product. Can do.

  In the electric discharge machining electrode 1F of this embodiment, four concave portions 9F are provided every 90 degrees. However, the number of the recesses is arbitrary and can be changed according to the size of the recesses. Each concave portion 9F is a concave groove whose inner surface is a concave curved surface.

  In addition, if the semi-finished product T1 is rotated during the above-described processing method, a plurality of concave portions 9F formed of spiral grooves can be processed and formed.

  According to the present embodiment, even if the concave portion 9F is formed by laser irradiation, the same effects as those of the first embodiment and the modified example can be obtained.

  FIG. 23 is a front view showing an electrode portion of an electric discharge machining electrode according to a modification. In this modification, the number of recesses 9G is reduced. That is, in this modification, two concave portions 9G are provided every 180 degrees.

  Also in this modified example, the same effects as those of the third embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Electric discharge machining electrode 3 Grasping part 5 Electrode part 9 Recessed part 11 Rod end base end part 13 Chuck 15 Rod end part 17 Grasping part processing part 19, 21 Bit (cutting tool)
19b, 21b Horizontal cutting edges t0 to t6 Cutting depths W0, W Bar-shaped workpiece α1, α2, β1, β2, γ Approach angle

Claims (10)

Hold the base end of the rod-shaped workpiece that is the gripped part of the EDM electrode on the chuck,
Turning the tip of the rod-shaped workpiece while suppressing the back force with a cutting tool that gives a part that forms a negative approach angle to the horizontal cutting edge to form a fine discharge electrode part,
On the outer peripheral surface of the electrode part, a recess for discharging machining waste is formed.
A method for machining an electric discharge machining electrode. Hold the base end of the rod-shaped workpiece on the chuck,
A machining method of an electric discharge machining electrode for forming a fine electric discharge electrode portion while turning the tip portion of the rod-shaped workpiece while suppressing a back force with a cutting tool provided with a portion having a negative approach angle on a horizontal cutting edge Because
The rod-shaped workpiece includes a gripped portion processing portion for forming a gripped portion of an electric discharge machining electrode between the base end portion and the distal end portion,
The tip of the rod-shaped workpiece and the gripped portion processed portion are both processed by the turning process, and the electrode portion is formed concentrically with respect to the gripped portion,
On the outer peripheral surface of the electrode part, a recess for discharging machining waste is formed.
A method for machining an electric discharge machining electrode. A method for machining an electric discharge machining electrode according to claim 1 or 2,
The concave portion is the concave groove or notched groove.
A method for machining an electric discharge machining electrode. A method for machining an electric discharge machining electrode according to claim 3,
A plurality of the recesses are formed in the circumferential direction of the electrode part.
A method for machining an electric discharge machining electrode. It is the processing method of the electric discharge machining electrode in any one of Claims 1-4,
The formation of the recess is performed by grinding, laser irradiation, or cutting.
A method for machining an electric discharge machining electrode. It is the processing method of the electric discharge machining electrode in any one of Claims 1-5,
The back component force acting on the cutting tool is set to zero with a cutting amount that is greater than or equal to the setting,
A method for machining an electric discharge machining electrode. It is a processing method of the electric discharge machining electrode in any one of Claims 1-6,
The electrode portion is formed with a uniform diameter or a different diameter in the axial direction.
A method for machining an electric discharge machining electrode. A method for machining an electric discharge machining electrode according to claim 7,
Forming the electrode portion with a different diameter in the axial direction by causing the turning to be performed using a plurality of cutting tools of different designs;
A method for machining an electric discharge machining electrode. An electric discharge machining electrode formed by the electric discharge machining electrode machining method according to claim 7 or 8,
The electrode part is a fine axis having a uniform diameter or a different diameter in the axial direction.
An electrical discharge machining electrode. The electric discharge machining electrode according to claim 9,
The different diameter micro-axis is either a stepped micro-axis or a tapered micro-axis.
An electrical discharge machining electrode.