JPH0321285B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a wire cut electric discharge machining apparatus, in particular, a method in which machining liquid supplied to the machining gap between the wire electrode and the workpiece and around the wire electrode is easily transferred to the already machined machining groove side. The present invention relates to a device configured to effectively remove processing debris, cool wire electrodes and workpieces, etc. without escaping.

A wire cut electrical discharge machining device moves a wire electrode between a pair of positioning guides while maintaining a predetermined tension while reeling the wire electrode from one reel and winding it onto the other reel. A machining gap is formed by facing the workpiece from a direction approximately perpendicular to the axis of the wire electrode that moves between the gaps, and a machining fluid such as water is supplied to this gap, and a machining voltage pulse is applied to generate a pulse discharge. The workpiece is cut into a desired contour shape by generating a discharge and moving the workpiece and the wire electrode relative to each other in the plane in the perpendicular direction while repeating this discharge.

For example, a wire cut electric discharge machining apparatus shown in FIG. 1 will be explained.

In this wire-cut electrical discharge machining apparatus, a wire electrode 2 is unwound from a reel provided in a column or the like of the apparatus main body (not shown) via a brake roller, etc., and extends downward via a guide roller 11 of an arm 1. The energizing roller and guide roller 25 of the arm 14 provided opposite to the winding roller and the column, etc., the portion of the wire electrode 2 between the guide rollers 11 and 25 that reaches the winding reel of the main body or the collection container, and the covered Electric discharge machining is performed by applying intermittent voltage pulses between the machine and the workpiece 3. The arm 1 disposed above is provided with a support member 1 having an L-shaped cross section so as to be substantially perpendicular to the arm 1 and capable of being vertically moved and positioned by a manual handle or a motor 12.
The upper part of No. 3 is attached. A wear-resistant, normally cylindrical current-carrying pin 4 made of cemented carbide or the like is attached to the lower front side of the support member 13 for contacting the wire electrode 2 and applying a voltage pulse. A wear-resistant, usually insulating pressing pin 4A is arranged in parallel to press the wire electrode 2, and is attached to the wire electrode 2 at a position closer to the processing portion 3A of the workpiece 3 in the almost straight line between the guide rollers 11 and 15. are in contact. Further, an appropriate portion such as the upper end of a hollow cylindrical nozzle main body 5 is fixed to the lower end of the support member 13 so as to be able to minutely adjust its position relative to the support member 13 in the horizontal direction as required. Openings 51 and 52 are formed in the upper and lower end surfaces of the nozzle body 5, and these openings 51 and 52 are formed approximately at the center axis of the nozzle body 5, and the wire electrodes 51 and 52 are formed between the guide rollers 11 and 25. are arranged in such a positional relationship that they are inserted coaxially.

Further, a cylindrical guide holder 6 of an upper positioning guide 61 is coaxially inserted into the nozzle body 5, and a nozzle 7 is coaxially disposed in the lower end face opening 52 and is movable in the axial direction. , are fitted with a spring 72 interposed as necessary.

The guide holder 6 is a hollow cylindrical body having a hole 6a, and a dice-shaped positioning guide 61 is attached to the lower end thereof, and the position of the wire electrode 2 on the upper part of the workpiece 3 is determined by this guide 61. . The guide holder 6 is fixed to the nozzle main body 5 so that its position in the horizontal direction can be minutely adjusted as necessary. Further, the nozzle 7 is disposed at the lower part of the nozzle holder 6 and is fitted into an opening 52 at the lower end of the nozzle body 5 so as to be movable up and down depending on the supply output of the machining fluid, the flow rate, the distance to the workpiece 3, etc. The nozzle 7 is a hollow cylindrical body having a desired axial length, inner diameter, and axial inner diameter restriction, and the outer diameter of the end 71 of the flange portion located inside the nozzle body 5 is equal to the opening at the lower end of the nozzle holder 5. The inner diameter of the end portion 7 is larger than the inner diameter of the end portion 7.
The nozzle 7 is prevented from falling off from the nozzle body 5 by fitting and abutting the flange 1 at the lower end of the opening 52. Further, a pressurized machining fluid supply hose 53 is attached to an appropriate position on the upper side of the nozzle body 5, from which machining fluid is supplied into the nozzle body 5, cools the positioning guide 61 inside, and cools the positioning guide 61 in the lower part. The machining liquid is ejected from the nozzle 7 to the machining part of the workpiece 3, and is also ejected upward from the upper opening 51 to supply the machining liquid between the current-carrying pin 4 and the wire electrode 2. The current-carrying pin 4 is cooled. Further, the workpiece 3 is fixed to a processing table 31, and the processing table 31 is moved by motors 32 and 33 to a wire electrode 2 between the upper and lower guide rollers 11 or between the upper and lower positioning guides 61.
It is designed to be able to freely move along a predetermined contour shape on a plane perpendicular to the axis under the control of a numerical control device. Note that many of the configurations and members described above are provided not only above the workpiece but also below the workpiece, and below the workpiece 3 there is a vertical line with the workpiece 3 at the center. The explanation of the structure is omitted because it is the same as the above explanation except that each member is arranged almost symmetrically, but the lower current-carrying device comes into contact with the used wire electrode 2. Therefore, the energizing roller 25 is normally used which is brush energized from a rotatable machining power supply having a diameter sufficiently larger than that of the upper energizing pin 4. Further, since the machining fluid injected from the nozzle 7 to the machining section or its vicinity flows down the energizing roller 25, the opening 51 in the lower nozzle body 5 is not necessarily required, and the lower nozzle 7 may not be supplied with machining fluid. In the preparation state for machining, such as with sufficiently low pressure and a small supply of machining fluid, the nozzle 7 may fall due to its own weight and collide with the workpiece 3.
Since the spring 72 is spaced apart from the top nozzle 7, no spring 72 is needed to retract the nozzle 7, such as the upper nozzle 7.

During wire cut electric discharge machining, the upper nozzle 7 is brought close enough to the surface of the workpiece 3, for example, within 1 mm, or almost in contact with it, while the lower nozzle 7 is brought into contact with the surface of the workpiece 3. The lower surface is brought into almost pressurized contact with the machining fluid supply injection pressure, and the machining fluid injection pressure or flow rate from the upper nozzle 7 is controlled by the lower nozzle 7.
1.5 times or more, that is, the pressurized liquid flows into the machining gap 3A in such a manner that it blows up from the lower side.

Furthermore, the holder 6' of the guide 61 in the lower nozzle main body 5 of the illustrated embodiment does not have the working fluid flow hole 6a like the upper guide holder 6, and the rear end thereof is airtightly fitted and fixed in the opening 51. The machining fluid supplied from the hose 53 does not leak from the opening 51, and the machining fluid at a higher pressure and flow rate than the upper nozzle 7 can be jetted out from the lower nozzle 7.

Recently, the machining speed of wire cut electrical discharge machining has been improved, and efforts are being made to improve efficiency. Conditions necessary for high-speed machining include improvement of wire electrode materials, machining power source and its discharge pulse characteristics, method of energizing the wire electrode, and method of supplying and distributing machining fluid to machining parts such as machining gaps, etc., and each has been studied. It continues to be improved. Therefore, among the various conditions mentioned above, in particular, the supply of machining fluid is such that the wire electrode is sufficiently wrapped coaxially and cooled by flowing at the desired pressure, flow rate, or flow rate in the machining part and the parts before and after it. This increases the machining current and increases machining efficiency. In addition, when wire breaks during machining, especially at the corners of the machining shape, there is a lot of machining fluid escaping and the fluid supply becomes poor.
The gas generated during electrical discharge tends to accumulate or cause electrical discharge in the gas, resulting in many disconnection accidents during high-speed machining, which is an obstacle to automated unmanned operation.

The present invention was invented with the aim of solving such problems, and has a width that is the same as or smaller than the width of a machined groove formed in a workpiece by electrical discharge machining using a wire electrode. A rod-shaped body having a diameter is inserted approximately parallel to the wire electrode at an appropriately minute distance away from the wire electrode, and over approximately the entire thickness of the workpiece, and the rod-shaped body is aligned with the wire electrode axis. and a detection device for detecting the machining progress direction of the machining feed, and a detection signal from the device causes the rod-like body to move into the machining groove and process the wire electrode. It is characterized in that it is provided with a control device that controls the rotation so that it is on the back side of the surface.
Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is a side cross-sectional view of essential parts of an apparatus according to an embodiment of the present invention, in which parts denoted by the same reference numerals as in FIG. 1 indicate the same or substantially the same functions. The pair of upper and lower arms 1 and 14 may have a structure that forms one support arm 17, for example, as described in Japanese Unexamined Patent Publication No. 129400/1984, in addition to the structure provided in the column described above.

Also, a pair of processing part positioning guides 61 and 61
In this illustrated embodiment, since the wire electrode 2 is configured to rotate around the axis of the wire electrode 2, each of the guides 61 and 61 is a die guide held by a die holder. This die holder has a holder part 2 that fixes both ends of a rod-shaped body 40 that restrains the supplied machining liquid, which will be described later, in the machining gap and the machining groove 3B near the wire electrode 2.
6 and 27.

Each of the holder parts 26 and 27 is a radial bearing 2
8 and 29 to the cylindrical rotating shafts 30 and 31 rotatably attached to the upper and lower arms 1 and 14, and the positioning guides 61 and 6
The center axis of the guide 1 is made to coincide with the center axes of the cylindrical rotating shafts 30 and 31. Of course, these positioning guides 61 and 61 are located closer to the workpiece 3 than the guide rollers 11 and 25 and the current-carrying pins or rollers 4 and 25, as shown in the second embodiment below.
It may be substantially fixed to fixed parts such as the arms 1 and 14.

34A and 35A are the cylindrical rotating shafts 30 and 3.
The worm gears are worm gears fixedly provided on the arms 1 and 14, and are connected in the same direction to the rotating shafts of the controlled motors 36 and 37 provided on the arms 1 and 14 by worm shafts 34B and 35B, which are connected via appropriate gearboxes (not shown) or the like. Rotation is controlled at the same angle and speed.

Of course, one of the rotation drive mechanisms in the above case, for example, the worm gear 35A, worm shaft 35B, motor 37, etc. on the lower arm 14 side may not be provided as in the second embodiment described later, or there may be cases where other than the positioning guide is provided. For example, the holder part 27 may also be omitted.

The rod-shaped body 40 that restrains the machining liquid in the pressurized gap 3A and the machining groove 3B near the wire electrode 2 has both ends connected to the fixed parts 26A and 27A of the holder parts 26 and 27.
In this embodiment, the wire electrode coaxial machining liquid nozzle 73 on both sides of the workpiece 3 is attached to the wire electrode coaxial machining liquid nozzle 73 on both sides of the workpiece 3.
and 74 are attached to the holder parts 26 and 27, respectively, and the machining fluid supplied to the machining fluid nozzles 73 and 74 via the pressure-resistant flexible piping 41 and 42 is coaxially wrapped around the wire electrode 2. The liquid is ejected along the wire electrode 2 and supplied to the machining gap between the wire electrode 2 and the workpiece 3.

According to the configuration of the present invention, the machining fluid sprayed and supplied by the nozzles 73 and 74 around the wire electrode 2 such as the machining gap 3A and into the machining groove 3B is caused by the presence of the rod-shaped body 40. The flow to the machined groove 3B side in the workpiece 3 is prevented, and the machining fluid sprayed from the machining fluid injection nozzle 74, which is set at a higher pressure and higher flow rate than the others, is injected to a certain extent into the workpiece 3 from the nozzle 73. In the case shown in the figure, the machining liquid is blown upward from the vicinity of the upper end of the rod-shaped body 40 to the upper surface of the workpiece 3, and the machining part around the wire electrode 2 including the machining gap 3A is blown up from the rod-shaped body 40. In the machining groove 3B, the supplied machining fluid flows at high speed while maintaining a certain degree of pressure.
Therefore, the wire electrode 2, the machining gap 3A, and other machining parts can be sufficiently cooled, and the machining current can be increased to enable high-speed machining.

In this case, various materials and diameters can be used as the wire electrode 2. For example, if one made of copper or a copper-based alloy with a diameter of about 0.2 mm is used, the machining groove 3B in the straight part of the machining contour can be The width W may be determined by electrical processing conditions such as the material of the workpiece 3, the plate thickness and voltage, the pulse width of the discharge pulse, and the current amplitude, or by processing conditions set according to the purpose of processing (for example, by setting the processing feed rate to be specially slow). Although the maximum groove width varies depending on the processing conditions (setting conditions), etc., the maximum groove width is within the width of the groove at the right angle or acute angle broken line part of the machining contour line, the minute radius arc part, etc., and under normal machining conditions. , the diameter of the wire electrode 2 is approximately 0.2 mmφ, and the groove width W of the processed straight portion is approximately 0.27 mm, so the diameter of the rod-shaped body 40 should be the same as or slightly smaller than the groove width W. , a cylinder or cylindrical body made of an iron-based alloy such as stainless steel or a copper-based alloy such as a copper-zinc alloy, or a columnar or cylindrical body with an elliptical and equilong cross section in the processing direction, with the workpiece 3, or Further, the rod-shaped body 40 may be installed so as to be electrically insulated from the wire electrode 2, or the outer surface of the rod-shaped body 40 may be coated with insulation.

Further, the machining feed by relative numerical control (not shown) between the wire electrode 2 and the workpiece 3 is controlled by each axis by the X-Y cross slider of the workpiece 3 and the holding table 31, as in the case of FIG. The directional drive motors 32 and 33 are driven by numerical control commands, and the machining feed at this time is not only constant speed feed set in the numerical control device, but also servo control that detects and discriminates the electrical discharge machining state. This is carried out by controlled feeding, feeding by a combination of the above, and the like. When the motors 32 and 33 are driven by command signals from the numerical control device to perform machining, the rod-shaped body 40 contacts and collides with either side of the machining groove 3B at a curved or bent part of the machining contour. As a result, the position of the rod-shaped body 40 will be shifted from the back side of the machining surface of the wire electrode 2. Therefore, depending on the dimensions, shape, etc. of the desired machining contour line, the program data of the machining numerical control command may include: Rotational movement commands for the holder parts 26 and 27 to avoid the contact collisions, etc. are preset in a program, and these commands are sequentially read out as the machining progresses to drive the motors 36 and 37, and the rod-shaped body 40 is guided by the guides 61 and 61. Contact and collision prevention of the rod-shaped body 40 with the workpiece 3 can be easily achieved by rotating the rod-shaped body 40 around the center axis, that is, around the wire electrode 2 axis, and in this case, the workpiece wire electrode 2 If the distance between the shaft and the axis of the rod-shaped body 40, that is, the radius of the avoidance rotation arc of the rod-shaped body 40, is too large, not only will the rotation control program be complicated, but also the angle of the machining contour will be For example, if machining fluid is not smoothly supplied to the machining gap, problems such as deterioration of machining conditions and unstable machining conditions may occur, as well as problems with machining accuracy. Since accidents such as disconnection of the damaged wire electrode 2 may occur, the above-mentioned distance between the axes should be set as small as possible, preferably around or within 2 to 3 times to 4 to 5 times the diameter of the wire electrode 2. is preferred. In addition, the above-mentioned evasive rotation movement is
Pre-program setting for machining numerical control information as described above, detecting the operation command signal from the numerical control device for the external machining contour shape feed motors 32 and 33 of data input, and using the detection signal to calculate the distance between the axes, etc. It is not possible to realize the length even with a configuration in which the motors 36 and 37 are controlled by signals modulated and calculated, and the length is not possible at an appropriate location such as the side surface of the rod-shaped body 40, as described in Japanese Patent Laid-Open No. 54-17596. An electrical or mechanical proximity or contact detection probe is provided in a protruding manner, and an evasive rotation is performed in a predetermined necessary direction and angle in response to detection of proximity or contact with the probe. However, it is completely achievable.

FIG. 3 shows a second embodiment of the configuration in which the present invention is applied to a wire cut electric discharge machining apparatus having a configuration substantially similar to that in FIG.
0' is held around the upper machining liquid nozzle main body 5 in a controlled and rotatable manner about the wire electrode 2 as an axis, and the tip of the lower end is inserted into the machining groove 3B of the workpiece 3 so as to be inserted into the machining groove 3B of the workpiece 3. It is arranged to be located at almost the same position as the lower surface of the workpiece 3.

In the figures, parts with the same reference numerals as those in FIGS. 1 and 2 are the same or substantially the same working parts, and 50 is a radial bearing provided on the outer periphery near the tip of the nozzle body 5. , the disc-shaped gear 34A and the holding disc 43 of the holder part 26 of the rod-shaped body 40' are held to the main body 5 and rotatably around the axis of the main body 5, that is, around the two axes of the processing section wire electrode. , the rotation of the motor 36 held by the support member 13 drives the gear 34B that meshes with the gear 34A, and the gear 34 is rotated.
When A is rotated, the disk 43 which is integrally connected to the gear 34A by the coupling body 44 rotates, and as the machining progresses, the machining progress direction changes to a right angle, an acute angle, an obtuse angle, a circular arc shape, and various curves. Even if it changes into a rod-shaped body 4
0' is always located on the back side of the machining gap side of the wire electrode 2, which is placed at a small distance in the machining groove 3B, to increase the pressure and flow velocity of the jet machining fluid in the machining groove 3B, and to remove machining debris and the like and to ensure sufficient cooling. This action is exerted on the machining gap 3A and the wire electrode 2, increasing the machining current and increasing the machining speed.

Further, in this embodiment, a floating nozzle 7' movable in the axial direction of the wire electrode 2 with respect to the lower processing fluid nozzle body 5 is used as a main nozzle 7' directly coaxial with the wire electrode 2, and from the main nozzle 7' to the upper nozzle 7. A machining fluid with a pressure and flow rate approximately 1.5 to 5 times higher than that of the main nozzle 7' is injected coaxially along the wire electrode 2, and the tip of the main nozzle 7' is sufficiently close to or pressed against the lower surface of the workpiece 3. In order to prevent air from being sucked in from the middle of the jet of the main nozzle 7' from a certain abutting part of the two, and to prevent the main jet from separating from the wire electrode 2, a coaxial jet is formed by encircling the main jet in a coaxial shape. The sub-nozzle 45 is provided with a sub-nozzle 45 for forming the main nozzle 7', and the sub-nozzle 45 is fixed integrally with the main nozzle 7' so that the tip opening is the same or one is slightly retracted from the other depending on the processing purpose. A plurality of pressurized supply hoses 46 are preferably disposed in the same shape to supply a sufficient amount of machining liquid to the interior 48 which is larger than the ring-shaped opening 47 of the nozzle 45 around the nozzle 45.

FIGS. 4 and 5 are cross-sectional front views of the main nozzle 7' and the sub-nozzle 45, showing an example in which four pressurized supply hoses 46 for machining fluid are provided, and a fourth In the case of the figure, each hose 4
The direction of pressurized liquid jet supply into the sub-nozzle 45 by the sub-nozzle 45 in the figure is in the diametrical direction of the cross-sectional circle of the nozzle 45, whereas in the case of FIG. 5, it is provided in the tangential direction of the cross-sectional circle. This is intended to strengthen the flow of machining fluid to the wire electrode 2 by forming a swirling coaxial jet around the coaxial jet from the main nozzle 7'. FIG. 6 also shows the rod-shaped body 40'
1 configured so that the movement can be adjusted or changed in the axial direction with respect to the holder part 26 and the fixed part 26A.
The embodiment is shown in an enlarged side view of the relevant part, and a header 26B is provided at the upper end of the rod-shaped body 40' to allow the rod-shaped body 40' to be changed to a longer or shorter one as appropriate, and the rod-shaped body 40' is fixed. The rod-like body 40' is attached to the header 26A so that it can fit in and slide in the axial direction (although not shown, the lower end of the rod-like body 40' is a free end as in the embodiment shown in FIG. 3). A pinion 49B of a rotating shaft of a motor 49C provided on a fixed portion 26A is engaged with the provided rack 49A, and rotation of the motor 49C is controlled by desired adjustment settings, program command changes, machining status signals, etc. The rod-shaped body 40' is axially adjusted or controlled to move up and down with respect to the fixed part, and therefore with respect to the workpiece 3, and the position of the lower end tip of the rod-shaped body 40' is adjusted relative to the lower surface of the workpiece 3. The main nozzle 7' and the sub-nozzle 45 spray machining liquid around the wire electrode 2, such as the machining gap 3A and the machining groove 3B, by controlling the position change from a minute protrusion state to a position retracted to a certain extent into the machining groove. By changing the inflow amount and inflow conditions, it is possible to enable machining in more optimal machining conditions than in the case of regular machining fluid inflow conditions, or to normalize machining that has become unstable or abnormal. This allows the state to be restored.

In this embodiment, the length of the rod-shaped body 40' is not simply raised and lowered to position the tip, but the rod-shaped body 40' is moved reciprocating or vibrates at a relatively low frequency with a predetermined cycle and stroke. One or both of the strokes can be changed as desired, and if it is desired to generate high-frequency vibration with a relatively small stroke, an electromagnetic or electrostrictive vibrator may be provided in place of the motor 49C. It is also possible to perform a combined motion by appropriately combining these and the like.

As detailed above, according to the present invention, in wire cut electric discharge machining, the groove has a width that is the same as or smaller than the width of the machining groove formed in the workpiece by electric discharge machining using a wire electrode. A rod-shaped body is inserted approximately parallel to the wire electrode at a suitably small distance away from the wire electrode, and is inserted over approximately the entire thickness of the workpiece, and the rod-shaped body is inserted around the wire electrode axis. On the other hand, a detection device detects the machining progress direction of the machining feed, and a detection signal from the device causes the rod-shaped body to move in the machining groove on the machining surface of the wire electrode. By providing a rotation control device on the back side, the flow of the machining fluid sprayed from the machining fluid spray nozzle is regulated into the machining gap, around the wire electrode, and into the machined groove near the wire electrode. Since the supply and distribution of machining liquid to machining parts such as machining gaps and around the wire electrode can be carried out efficiently and effectively, machining speed can be improved and breakage of the wire electrode can be prevented. It has great effects on electrical discharge machining.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a schematic configuration of an example of wire cut electric discharge machining before the present invention, FIGS. 2 and 3 are explanatory diagrams of an embodiment of a different configuration of the present invention, and FIG.
5 and 5 are cross-sectional views of the portion shown in FIG. 3, each showing a different configuration example, and FIG. 6 shows an implementation of an additional configuration in the embodiment shown in FIG. 3. This is an example. In the figure, 61 is a positioning guide, 2 is a wire electrode,
3 is a workpiece, 7, 7', 73, 74, and 45 are machining fluid injection nozzles, 3B is a machining groove, and 40, 40' are rod-shaped bodies.

Claims (1)

[Scope of Claims] 1. While a wire electrode is updated and moved in the axial direction between a pair of positioning guides arranged at intervals, a workpiece is opposed to each other through a minute gap from a direction perpendicular to the axis of the wire electrode. and applying intermittent voltage pulses between the wire electrode and the workpiece while jetting and supplying the machining fluid along the wire electrode from a machining fluid spray nozzle provided on one or both sides of the workpiece in the gap. In the wire cut electrical discharge machining apparatus, which performs machining by the generated electrical discharge, and machining a desired contour shape by applying a relative machining feed between the wire electrode and the workpiece on the plane in the perpendicular direction, the wire A rod-shaped body having a width that is the same as or smaller than the width of a machined groove formed in a workpiece by electric discharge machining using an electrode is placed approximately parallel to the wire electrode at a position appropriately separated from the wire electrode by a small distance. , and the rod-shaped body is inserted over substantially the entire thickness of the workpiece, and is configured to be rotatable around the wire electrode axis, and detects the direction of machining progress of the machining feed. and a control device that controls the rotation of the rod-shaped body in the processing groove so that it is on the back side of the processing surface of the wire electrode based on the detection signal of the device. Wire cut electrical discharge machining equipment. 2. A machining fluid injection nozzle provided on one or both sides of the workpiece is installed so that the wire electrode of the machining part between the positioning guides coaxially penetrates, and along the wire electrode that wraps the wire electrode coaxially. The wire cut electric discharge machining apparatus according to claim 1, which is a coaxial machining fluid nozzle that forms a machining fluid jet flow. 3. The machining liquid spray nozzle provided on one or both sides of the workpiece has a coaxial machining liquid nozzle that forms a machining liquid jet flow along a wire electrode coaxially wrapped around a wire electrode, and the coaxial machining liquid nozzle A wire cut electrical discharge machining apparatus according to claim 1, comprising a machining fluid nozzle body that is held movable in the axial direction of the wire electrode. 4. Wire-cut electric discharge machining according to any one of claims 1 to 3, wherein both ends of the rod-shaped body are locked and fixed to rotating bodies around a wire electrode axis on both sides of the workpiece. Device. 5. The rod-shaped body is supported at one end by a rotating body around the wire electrode axis so as to be movable in the axial direction, and the axial position of the other free end is adjustable. A wire cut electric discharge machining apparatus according to any one of claims 1 to 3. 6. Is the rod-shaped body electrically insulated?
The wire cut electric discharge machining apparatus according to any one of claims 1 to 5, wherein the wire cut electric discharge machining apparatus is electrically insulated from the workpiece by being subjected to a surface insulation treatment or being made of an insulator.