Wire EDM machine

Abstract

To provide a wire electrical discharge machining apparatus equipped with a hybrid type transport device that prevents the device from becoming larger and reduces the force that attracts the wire electrode. [Solution] A wire electrical discharge machining machine comprising a winding device provided to be located outside the processing tank and having an upper winding roller and a lower winding roller; a conveyor belt provided between a direction-changing pulley and the winding device along the movement path of the wire electrode and guiding the movement of the wire electrode; a split pipe provided so as to cover the upper part of the conveyor belt and forming a closed space between itself and the conveyor belt; a shallow grooved pulley provided on the rear end side of the lower arm below the direction-changing pulley, with a groove on its circumference that fits with the split pipe; and a suction device provided between the winding device and the split pipe that sucks up the wire electrode being conveyed by the conveyor belt during processing and guides the wire electrode to the winding device.

Description

Technical Field

[0001] The present invention relates to a wire electrical discharge machining apparatus including a conveying device for feeding a wire electrode to a winding roller during automatic connection. In particular, the present invention relates to a wire electrical discharge machining apparatus including a hybrid type conveying device including a conveying belt and a suction device.

Background Art

[0002] Generally, a wire electrical discharge machining apparatus is configured to pay out a wire electrode wound around a wire bobbin, pass it through an upper wire guide and a lower wire guide, and wind it around a pair of winding rollers. Many wire electrical discharge machining apparatuses include an automatic connection device that automatically stretches a wire electrode between the upper and lower wire guides. The automatic connection device feeds out the wire electrode toward the upper wire guide by a feed roller, sequentially inserts it through the upper and lower wire guides, and guides it to the outside of the machining tank by a conveying device for the wire electrode provided along the lower arm, and captures the tip of the wire electrode by the winding roller.

[0003] In a conveying device for a wire electrode, as a method of moving the wire electrode to a winding device, a method of moving the wire electrode by a belt conveyor and a method of moving the wire electrode by a fluid are known. Hereinafter, for convenience of explanation, the method of moving the wire electrode by a belt conveyor is referred to as a belt transfer method, and the method of moving the wire electrode by a fluid is referred to as a fluid transfer method.

[0004] Patent Document 1 discloses a wire electrical discharge machining apparatus including a typical belt transfer type conveying device. Since the belt transfer type conveying device is configured such that upper and lower conveying belts sandwich the wire electrode and transmit a force to the wire electrode by friction to move it, it is advantageous for conveying a relatively large wire electrode having a diameter of φ0.2 MM or more. However, when feeding out a wire electrode having a relatively small diameter, the load applied to the wire electrode becomes relatively large, and breakage, winding, and deviation of the wire electrode are likely to occur.

[0005] Patent documents 2 and 3 disclose wire electrical discharge machining apparatus equipped with a fluid transfer type conveying device. Generally, fluid transfer type conveying devices fill a guide pipe with high-pressure fluid and use an aspirator to suck the fluid together with the wire electrode and send the wire electrode out. Therefore, in the case of wire electrodes with a large diameter that are highly rigid and prone to deformation, the tip of the wire electrode is likely to get caught in the guide pipe and buckle. Also, in the case of wire electrodes with a small diameter, there is a risk that the wire electrode will stick to the inner surface of the guide pipe and become unable to move, so this method is not suitable. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 1-140924 [Patent Document 2] Japanese Patent Application Publication No. 1-135426 [Patent Document 3] Japanese Patent Application Publication No. 5-92322 [Overview of the project] [Problems that the invention aims to solve]

[0007] As mentioned above, both belt transfer and fluid transfer methods have types of wire electrodes that are suitable for transport, and both methods have their own challenges in terms of equipment configuration. In the belt transfer method, the equipment configuration, which transports the wire electrode by sandwiching it between upper and lower conveyor belts, requires maintenance of the upper and lower conveyor belts, which wear down, and management of the gap between the conveyor belts. In addition, because a large number of pulleys are required to drive the upper and lower conveyor belts, the overall size of the equipment is larger compared to the fluid transfer method.

[0008] In fluid transfer systems, the suction path is changed from horizontal to diagonal to avoid interference between the suction path and the workpiece, requiring a strong suction force. This is especially true when connecting extremely thin wires with little rigidity, specifically wire electrodes with a diameter of φ0.05 mm or less; even stronger suction is required.

[0009] In fluid transfer systems that use strong suction to pull wire electrodes, the wire electrodes may be pulled in unintended directions. To prevent this, a roller opening / closing mechanism is sometimes installed to widely open and close the winding roller to encourage suction in the direction the wire electrodes should be pulled, or a mechanism is installed to move the aspirator to pull the wire electrodes coaxially with the pipe. In addition, a defoaming device is necessary to deal with the bubbles generated by the strong suction, and fluid transfer systems tend to become larger as a result.

[0010] The primary objective of the present invention is to provide a wire electrical discharge machining apparatus equipped with a hybrid conveying device including a conveyor belt and a suction device, thereby preventing the apparatus from becoming larger and reducing the force that sucks the wire electrode, in order to solve the above problems. Several advantages obtained by the wire electrical discharge machining apparatus of the present invention will be described in detail as they occur in the description of specific embodiments. [Means for solving the problem]

[0011] A wire electrical discharge machining apparatus comprising a lower arm that supports a lower guide unit so as to be positioned in a machining chamber, and at least one direction-changing pulley provided on the lower arm so as to be positioned below the lower guide unit, wherein the apparatus comprises a winding device provided so as to be positioned outside the machining chamber and having an upper winding roller and a lower winding roller, a conveyor belt provided between the direction-changing pulley and the winding device along the movement path of the wire electrode and guiding the movement of the wire electrode, a split pipe provided so as to cover the upper part of the conveyor belt and forming a closed space between the conveyor belt and the conveyor belt, a shallow grooved pulley provided on the rear end side of the lower arm below the direction-changing pulley, with a groove in its circumferential portion fitting with the split pipe, and a suction device provided between the winding device and the split pipe and suctioning the wire electrode being conveyed by the conveyor belt during machining and guiding the wire electrode to the winding device.

[0012] In particular, the upper winding roller has a lever connected to it and a cylinder connected to the lever. When the lever is pressed to initiate automatic wire connection of the wire electrodes, the upper winding roller moves upward, creating a gap between it and the lower winding roller. Furthermore, when the lever is pressed at the start of automatic wiring, the upper winding roller moves upward. Once automatic wiring is complete, it returns to its original position, eliminating the gap between it and the lower winding roller, and the wire electrode inserted through the resulting gap is held in place. Furthermore, after the wire electrode is sucked in, the suction device blows air towards the winding roller to guide the wire electrode toward the winding roller. In addition, multiple direction-changing pulleys and shallow-grooved pulleys are provided to match the movement path of the wire electrode WE. [Effects of the Invention]

[0013] According to the present invention, by using a single conveyor belt, the number of pulleys required to drive the belt can be reduced. Furthermore, maintenance of the upper and lower conveyor belts, which wear out, and management of the gap between the conveyor belts, which are required in a device configuration where the wire electrode is conveyed by being sandwiched between upper and lower conveyor belts, become unnecessary. In addition, by conveying the wire electrode using a hybrid method that uses a conveyor belt and a suction device, it becomes unnecessary to suction the wire electrode with strong force, and components that cause the device to become large, such as aspirators and defoaming devices, become unnecessary.

[0014] Therefore, in conveying devices using belt conveyor systems and fluid transfer systems, it is possible to solve the conventional problem of large device size and provide a more compact conveying device for wire electrical discharge machining. Furthermore, by conveying wire electrodes using a hybrid conveying device that includes a conveyor belt and a suction device, it is possible to transport wire electrodes of any diameter or material without transport failure by taking advantage of the advantages of both belt transfer and fluid transfer systems. [Brief explanation of the drawing]

[0015] [Figure 1]This is a diagram schematically showing the overall configuration of the wire electrical discharge machining apparatus of the present invention. [Figure 2] This is a schematic diagram showing the overall configuration of the take-up roller of the present invention. [Figure 3] This is a diagram showing the operation of the take-up roller of the wire electrical discharge machining apparatus of the present invention. [Figure 4] This is a schematic diagram showing the configuration of the take-up roller and the conveying device of the wire electrical discharge machining apparatus of the present invention. [Figure 5] This is a schematic diagram showing the configuration of the pulley with a shallow groove of the present invention. [Figure 6] This is a schematic diagram showing a second embodiment in which the conveying belt of the present invention is provided on the direction-changing pulley.

Embodiments for Carrying out the Invention

[0016] FIG. 1 shows the overall outline of the wire electrical discharge machining apparatus of the present invention. In order to show the entire running path of the wire electrode on one plane, FIG. 1 shows the supply side of the wire electrode as seen from the front of the main body of the machine, and shows the recovery side of the wire electrode as seen from the left side surface of the main body of the machine. Also, in FIG. 1, note that the relative sizes and positional relationships of the plurality of constituent members are different from the actual ones in order to make the plurality of constituent members easier to understand.

[0017] First, the overall configuration of the wire electrical discharge machining apparatus according to the embodiment shown in FIG. 1 will be described. The wire electrical discharge machining apparatus according to the embodiment has at least a traveling device 1, an automatic connection device 2, a wire guide unit 3, a control device (not shown), a power supply device, and a relative movement device. The part where the traveling device 1, the automatic connection device 2, the wire guide unit 3, and the relative movement device are provided is called the main body of the machine.

[0018] The traveling device 1 is a means for supplying a wire electrode WE unused in machining to a machining gap GP formed between the wire electrode WE and the workpiece WP, and recovering the used wire electrode WE subjected to machining. The traveling device 1 includes a supply device 11, a tension device 12, a conveying device 13, and a recovery device 14. The supply side 1A of the wire electrode WE includes from the supply device 11 to the upper wire guide unit 3A via the tension device 12 and the automatic connection device 2, and the recovery side 1B of the wire electrode WE includes from the lower wire guide unit 3B to the recovery device 14 via the conveying device 13.

[0019] The automatic connection device 2 is a means for automatically stretching the wire electrode WE. The automatic connection device 2 of the wire electrical discharge machining apparatus of the embodiment includes a feed roller 2A, a guide pipe 2B, and a cutter 2C. The feed roller 2A is a means for rotating by a feed motor 2M and feeding out the wire electrode WE. The guide pipe 2B is a means for guiding the tip of the wire electrode WE to the upper wire guide unit 3A. The cutter 2C is a means for cutting the wire electrode WE. For example, the cutter 2C can be replaced with another means for cutting the wire electrode WE such as a heating roller for fusing the wire electrode.

[0020] The wire guide unit 3 consists of an upper wire guide unit 3A and a lower wire guide unit 3B. The upper wire guide unit 3A and the lower wire guide unit 3B are each an assembly formed by integrating a wire guide 30A (guide body) for positioning and guiding the wire electrode WE, a current-carrying body 30B for supplying power to the wire electrode WE, and a machining liquid jet nozzle 30C for supplying a machining liquid jet to the machining gap GP.

[0021] The control device, which is not shown in the illustration, is a means for controlling the operation of the wire electrical discharge machining apparatus. The control device is connected to the traveling device 1, the automatic connection device 2, the machining power supply device, or the relative moving device by one or more signal lines, and each device is used to execute a predetermined sequence of operations. The control device includes a numerical control device that arbitrarily controls the overall operation of the wire electrical discharge machining apparatus to perform desired machining by causing the traveling device 1, the automatic connection device 2, the machining power supply device, and the relative moving device to perform specific operations according to an NC program.

[0022] The machining power supply device is a means for continuously supplying discharge current pulses having a desired waveform and peak current value to the machining gap GP. The relative movement device is a means for moving the wire electrode WE and the workpiece WP relative to each other in two horizontal axis directions. The relative movement device includes a taper device that tilts the wire electrode WE and the workpiece WP.

[0023] The processing tank 4 is a means for containing the workpiece WP. The processing tank 4 is also a means for containing the processing fluid. When processing is performed using the "flushing method," in which a jet of processing fluid is injected into the processing gap GP while the workpiece WP is exposed to the air, the tank walls prevent the scattering of the processing fluid, and the processing tank 4 functions as a splash guard. When processing is performed using the "die-sinking method," in which the workpiece WP is immersed in the processing fluid, the tank walls prevent the leakage of the processing fluid, and the processing tank 4 literally functions as a tank.

[0024] The lower arm 5 is a means for supporting the lower wire guide unit 3B at its tip. In the wire electrical discharge machining apparatus of this embodiment, the lower arm 5 is installed at an angle to the front of the machine so that its tip can be positioned inside the machining tank 4, beyond the tank wall of the machining tank 4. The lower arm 5 can also be installed horizontally, penetrating the tank wall of the machining tank 4. However, installing the lower arm 5 at an angle has the advantage of not requiring a seal between the tank wall of the machining tank 4 and the lower arm 5.

[0025] The rear end of the lower arm 5 is fixed to the machine structure outside the processing tank 4. Specifically, in the wire electrical discharge machining apparatus of this embodiment, the lower arm 5 is fixed to the column 6 together with the recovery unit to which the winding roller 14A of the recovery device 14 is attached. The tip of the lower arm 5 is positioned inside the processing tank 4. At its tip, the lower arm 5 supports the lower wire guide unit 3B and the direction change pulley 9.

[0026] The direction-changing pulley 9 is rotatably mounted directly below the lower wire guide unit 3B in the guide block 20, which is fixedly provided at the tip of the lower arm 5. The direction-changing pulley 9 changes the direction of travel of the wire electrode WE, which travels perpendicular to the mounting surface of the workpiece WP, to a horizontal uniaxial direction perpendicular to the direction of travel of the wire electrode WE. In addition, the shallow grooved pulley 10, which is provided on the rear end side of the lower arm 5 than the direction-changing pulley 9, changes the direction of travel of the wire electrode WE from a horizontal uniaxial direction perpendicular to the direction of travel of the wire electrode WE to the direction of the winding roller 14A provided on the outside of the processing tank 4. Multiple direction-changing pulleys 9 and shallow grooved pulleys 10 can be provided to match the movement path of the wire electrode WE.

[0027] Next, the traveling device 1 in the wire electrical discharge machining apparatus of this embodiment will be described in more detail. The supply device 11 of the traveling device 1 is a means for supplying the wire electrode WE to the machining gap GP. The supply device 11 includes a reel 11A, a wire bobbin 11B, a servo pulley 11F, and a brake 11M. However, the wire bobbin 11B is a replaceable consumable that stores a wire electrode WE of a predetermined length wound around its axis. The wire bobbin 11B is loaded onto the reel 11A and rotates.

[0028] The reel 11A rotates in accordance with the speed at which the tensioning device 12 continuously pulls the wire electrode WE from the wire bobbin 11B. The brake 11M is, for example, a torque motor or a powder clutch. The brake 11M is directly connected to the rotation axis of the reel 11A and prevents the wire bobbin 11B from spinning freely by applying a load in the opposite direction to the rotation direction of the reel 11A within the range in which the reel 11A can rotate. The servo pulley 11F moves up and down by its own weight in accordance with fluctuations in the tension of the wire electrode WE, absorbing vibrations of the moving wire electrode WE supplied from the wire bobbin 11B.

[0029] The tensioning device 12 is a means for feeding the wire electrode WE from the wire bobbin 11B and sequentially into the processing gap GP. The tensioning device 12 is also a means for applying a predetermined tension to the wire electrode WE supplied to the processing gap GP in conjunction with the recovery device 14. The tensioning device 12 includes a drive roller 12A, a driven roller 12B, a pinch roller 12C, and a servo motor 12M. The strain gauge 12T is a tension detector. The limit switch 12L is a wire break detector.

[0030] The drive roller 12A serves as both a feed roller, pulling the wire electrode WE from the wire bobbin 11B and feeding it into the processing gap GP, and a tension roller, applying a predetermined tension to the wire electrode WE. The wire electrode WE is wound around the outer circumference of the drive roller 12A in a roundabout manner by the driven roller 12B and the pinch roller 12C. The drive roller 12A is rotated by a servo motor 12M. The control device maintains a constant tension by controlling the rotation speed of the servo motor 12M based on the tension detected by the strain gauge 12T.

[0031] The conveying device 13 is a means for guiding the used wire electrode WE, which has been redirected in a substantially horizontal direction by the direction-changing pulley 9, to the outside of the processing tank 4. The conveying device 13 comprises a conveying belt 13A, a split pipe 13B, and a suction device 13C. The conveying belt 13A is provided along the movement path of the wire electrode WE between the direction-changing pulley 9 and the winding roller 14A at the tip side of the lower arm 5. As shown in Figure 5, the split pipe 13B is provided so as to cover the upper part of the conveying belt 13A. The suction device 13C is provided between the ends of the conveying belt 13A and the split pipe 13B on the winding roller 14A side and the winding roller 14A.

[0032] As shown in Figure 5, the shallow grooved pulley 10 has a groove R on its circumference, which fits with the split pipe 13B. The shallow grooved pulley 10 changes the direction of travel of the wire electrode WE from a horizontal uniaxial direction perpendicular to the direction of travel of the wire electrode WE to the direction of the winding roller 14A located on the outside of the processing tank 4.

[0033] The conveyor belt 13A guides the movement of the wire electrode WE from the direction change pulley 9 to the winding roller 14A. As shown in Figures 2 and 4, the lower winding roller 14C of the winding roller 14A is connected to a roller 13D, which is provided coaxially and parallel to the lower winding roller 14C, by a timing belt 14F. The conveyor belt 13A is wound around the roller 13D and the roller 13E located at the turning end of the conveyor belt 13A, and the conveyor belt 13A is driven when the rotation of the lower winding roller 14C is transmitted to the roller 13E located at the turning end of the conveyor belt 13A.

[0034] The split pipe 13B, which is provided to cover the upper part of the conveyor belt 13A, forms a closed space between it and the conveyor belt 13A. Since the wire electrode WE moves within the closed space between the split pipe 13B and the conveyor belt 13A, it is prevented from falling off or protruding from the conveyor belt 13A during transport. The suction device 13C sucks and captures the tip of the wire electrode WE as it is being transported by the conveyor belt 13A.

[0035] The recovery device 14 is a means for recovering used wire electrodes WE. The recovery device 14 is also a means for moving the wire electrodes WE at a constant speed. The recovery device 14 includes a winding roller 14A, a winding motor 14M, and a bucket 14R.

[0036] The winding roller 14A includes a pair of rollers: an upper winding roller 14B that rotates on its own axis due to a winding motor 14M, and a lower winding roller 14C that rotates due to its drive roller. The winding roller 14A holds the wire electrode WE between the pair of rollers and causes the wire electrode WE to travel at a constant speed.

[0037] As shown in Figure 3, the upper winding roller 14B of the winding roller 14A has a lever 14D connected to the upper winding roller 14B and a cylinder 14E connected to the lever 14D. The control device moves the upper winding roller 14B from a state in which the upper winding roller 14B and the lower winding roller 14C are in contact, as shown in Figure 3(A), to a state in which a space is created between the upper winding roller 14B and the lower winding roller 14C, as shown in Figure 3(B). Specifically, when automatic wiring starts, the control device drives the cylinder 14E connected to the lever 14D, causing the upper winding roller 14B to move away from the lower winding roller 14C, and a gap is formed between the upper winding roller 14B and the lower winding roller 14C. As a result, the wire electrode WE is released from constraint and the path for the wire electrode WE is opened. The opening and closing mechanism of the upper winding roller 14B is explained using a lever type as an example, but this is merely one example and can be replaced with various other methods. Other types of opening and closing mechanisms include, for example, cam type, link type, and direct-acting type.

[0038] The winding motor 14M that rotates the drive roller maintains a predetermined rotational speed that is faster than the rotational speed of the servo motor 12M of the tensioning device 12. Due to the speed difference between the drive roller 12A and the winding roller 14A of the tensioning device 12, tension is applied to the wire electrode WE at a predetermined travel speed, with a tension corresponding to the speed difference between the drive roller 12A and the winding roller 14A.

[0039] The bucket 14R of the recovery device 14 is a recovery box for recovering the wire electrode WE. The bucket 14R is equipped with a water drain plate 14G, such as a wire mesh. When it is desired to recover the wire electrode WE in a finely cut state, the water drain plate 14G can be replaced with a fine-mesh filter.

[0040] Next, the operation of the wire electrical discharge machining apparatus of this embodiment during automatic wire connection will be explained in detail, mainly with reference to Figure 1. Figure 1 shows the state immediately after the wire electrodes have been connected.

[0041] Immediately before starting automatic wiring, the tip of the wire electrode WE is positioned at least on the processing gap GP side of the feed roller 2A of the automatic wiring device 2 shown in Figure 1. The control device also drives the cylinder 14E connected to the lever 14D to press the lever 14D, moving the upper winding roller 14B away from the lower winding roller 14C, and opening the path for the wire electrode WE.

[0042] The control device drives the conveyor belt 13A and the suction device 13C of the conveying device 13. Upon the start of automatic wiring, the control device rotates the discharge roller 2A of the automatic wiring device 2 in the discharge direction at a predetermined rotational speed. Once the tip of the wire electrode WE is inserted into the guide pipe 2B, the control device lowers the guide pipe 2B at the same speed as the movement speed of the wire electrode WE. Since the inside of the guide pipe 2B is filled with a high-pressure water flow, the wire electrode WE with its tip pointing downward is guided through the guide pipe 2B without getting caught on the inner wall of the guide pipe 2B, and reaches the upper wire guide unit 3A.

[0043] The control device supplies a processing fluid jet from the upper wire guide unit 3A to form a liquid column JB between the upper wire guide unit 3A and the lower wire guide unit 3B. The tip of the wire electrode WE, which is moving downward by the delivery roller 2A, reaches the lower wire guide unit 3B while being constrained by the liquid column JB.

[0044] The wire electrode WE, having passed through the lower wire guide unit 3B, reaches the groove-shaped travel path formed between the direction change pulley 9 and the guide block 20 without deviating from the travel path formed in the guide block 20 by the high-pressure jet supplied from the jet nozzle 3D. The direction change pulley 9, which is an idling roller, works in cooperation with the high-pressure jet from the jet nozzle 3D to guide the wire electrode WE to the conveyor belt 13A.

[0045] As a second embodiment, a conveyor belt 13A may also be provided on the direction change pulley 9, as shown in Figure 6. In this case, the roller 13E, which is the turning end of the conveyor belt 13A, is provided on the guide block 20. The rotation of the lower winding roller 14C shown in Figure 2 is transmitted to the roller 13D via the timing belt 14F, and then to the roller 13E located at the turning end via the conveyor belt 13A, thereby driving the conveyor belt 13A. When a conveyor belt 13A is provided on the direction change pulley 9, the wire electrode WE that has passed through the lower wire guide unit 3B is transported to the shallow grooved pulley 10 side by passing between the conveyor belt 13A and the direction change pulley 9.

[0046] When the tip of the wire electrode WE reaches the conveyor belt 13A, the control device increases the rotational speed of the delivery motor 2M to rotate the delivery roller 2A at high speed. The wire electrode WE is carried on the conveyor belt 13A and reaches the shallow grooved pulley 10 from the direction change pulley 9. At this time, since the wire electrode WE is moving in the closed space between the conveyor belt 13A and the split pipe 13B, it does not fall off or protrude from the conveyor belt 13A during transport. Furthermore, in a belt conveyor system, the wire electrode is transported by being sandwiched between a pair of conveyor belts, so maintenance such as managing the gap between the conveyor belts and checking the wear of the conveyor belts is necessary, but this is unnecessary in the present invention.

[0047] When the suction device 13C captures the tip of the wire electrode WE, it guides the wire electrode WE toward the winding roller 14A. After passing through the suction device 13C, the wire electrode WE is pushed toward the winding roller 14A by the thrust of the conveyor belt 13A. The suction force of the suction device 13C can be smaller than that of a fluid transfer type aspirator because the conveyor belt 13A generates a force that moves the suction device 13C toward it. This eliminates the need for a configuration that moves the aspirator coaxially with the wire electrode WE, and for a defoaming device to eliminate bubbles generated by strong suction, thus preventing the device from becoming larger.

[0048] If the wire electrode WE being transported is a small wire electrode WE with a diameter of less than φ0.05 mm, the suction device 13C may suck up the wire electrode WE coming from the transport belt 13A and then blow air towards the winding roller 14A, guiding the wire electrode WE into the gap between the upper winding roller 14B and the lower winding roller 14C along with the blown air.

[0049] The control device stops the conveyor belt 13A and the jet nozzle 3D when it detects, by a sensor (not shown), that the tip of the wire electrode WE has reached the bucket 14R, in other words, when automatic wiring is complete. After that, it returns the position of the open upper winding roller 14B to grip the wire electrode WE. After wiring is complete, the conveyor belt 13A is stopped, but the suction device 13C may be stopped, or if the diameter of the wire electrode WE is small, it may be left running.

[0050] The present invention does not need to be the same as the configuration of the wire electrical discharge machining apparatus of the embodiments described above. Although several examples have already been shown, the present invention can be modified, components can be replaced, or it can be combined with other inventions without departing from the technical concept of the present invention. [Industrial applicability]

[0051] This invention can be applied to the field of electrical discharge machining. This invention reduces the time required for automatic wire connection in wire electrical discharge machining, lowers the frequency of machine maintenance, and prevents the equipment from becoming oversized. [Explanation of Symbols]

[0052] 1. Traveling device 2. Automatic wiring device 2A Feed Roller 2B Guide Pipe 3 Wire guide unit 3A Upper Wire Guide Unit 3B Lower wire guide unit 4 Processing tank 5 Lower arm 6 Columns 7 Cover 9 Directional pulley 10 shallow groove pulleys 11 Feeding device 11B Wire Bobbin 12 Tension device 12A drive roller 12M Servo Motor 13 Conveying device 13A Conveyor Belt 13B Half-split pipe 13C Suction device 13D Laura 13E Laura 14 Recovery device 14A Winding Roller 14B Upper winding roller 14C Lower winding roller 14D Lever 14E Cylinder 14F Timing belt 14M reel motor 20 Guide Blocks R groove WE wire electrode WP Workpiece

Claims

1. A lower arm that supports the lower guide unit so that it is positioned inside the processing tank, A wire electrical discharge machining apparatus comprising: at least one direction-changing pulley provided on the lower arm so as to be located below the lower guide unit; A winding roller having an upper winding roller and a lower winding roller is provided so as to be located outside the processing tank, A conveyor belt is provided between the direction-changing pulley and the winding roller along the movement path of the wire electrode to guide the movement of the wire electrode, A split pipe is provided to cover the upper part of the front conveyor belt and form a closed space between it and the front conveyor belt, A shallow grooved pulley is provided on the rear end side of the lower arm, with a groove on its circumference that fits with the split pipe. A wire electrical discharge machining machine comprising a conveying device that includes a suction device provided between the winding roller and the previously split pipe, which sucks up the wire electrode being conveyed by the conveying belt during processing and guides the wire electrode to the winding roller.

2. The upper winding roller is, A lever connected to the upper winding roller, It has a cylinder connected to the lever, The wire electrical discharge machine according to claim 1, wherein when the automatic connection of the wire electrode is started, the lever is pressed, causing the upper winding roller to move upward and form a gap between it and the lower winding roller, and the wire electrode is inserted into the formed gap.

3. The wire electrical discharge machine according to claim 2, wherein the upper winding roller, which moves upward when the lever is pressed at the start of automatic wiring, returns to its original position when automatic wiring is completed, eliminating the gap between it and the lower winding roller, and the wire electrode inserted through the formed gap is clamped.

4. The wire electrical discharge machine according to claim 1, characterized in that the pre-suction device blows air towards the winding roller side after sucking the pre-wire electrode to guide the pre-wire electrode toward the winding roller side.

5. The wire electrical discharge machine according to claim 1, characterized in that a plurality of the forward direction change pulley and the shallow grooved pulley are provided in accordance with the movement path of the wire electrode.

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