Wire EDM apparatus

Abstract

This invention provides a wire electrical discharge machining (EDM) apparatus, which improves the conveying device to eliminate the need for sealing devices in the machining tank. A conduit (14A), provided between a guide pulley (10) and a winding device (13A) along the movement path of the wire electrode (WE) and guiding the wire electrode (WE), is antistatic. A gas-liquid mixture is supplied into the conduit (14A). A suction nozzle (14N) is directly or indirectly connected to the outlet side of the conduit (14A) via a pair of rollers (13D, 13T) of the winding device (13A). The suction nozzle (14N) draws the gas-liquid mixture within the conduit (14A) and the tip of the wire electrode (WE) through the suction device (14E), capturing the wire electrode (WE). The captured wire electrode (WE) is then wound onto the winding device (13A).

Description

Technical Field

[0001] This invention relates to a wire electrical discharge machining (EDM) apparatus that includes a conveying device for feeding wire electrodes to a winding device during automatic wiring. In particular, this invention relates to a wire EDM apparatus that includes a conveying device comprising a conduit for fluid transport. Background Technology

[0002] Generally, a wire electrical discharge machining (EDM) apparatus is configured such that a wire electrode wound on a spool is extracted and wound onto a winding device comprising a pair of winding rollers via an upper and lower wire guide. Many EDM apparatuses include an automatic wiring device that automatically positions the wire electrode between the upper and lower wire guides. The automatic wiring device feeds the wire electrode toward the upper wire guide via a feed roller and sequentially inserts it through the upper and lower wire guides. The electrode is then guided to the outside of the machining groove by a conveying device along the lower arm, allowing the winding device to capture the tip of the wire electrode.

[0003] In wire electrode conveying devices, known methods for moving the wire electrode to the winding device include moving the wire electrode by a belt conveyor and moving the wire electrode by a fluid. Hereinafter, for ease of explanation, the method of moving the wire electrode by a belt conveyor will be referred to as belt conveying, and the method of moving the wire electrode by a fluid will be referred to as fluid conveying.

[0004] Patent Document 1 discloses a wire electrical discharge machining (EDM) apparatus including a typical conveying device with a transfer mechanism. The conveying device with a transfer mechanism consists of a pair of annular belts clamping the wire electrode and transmitting force to the wire electrode through friction, thus facilitating the transport of relatively large wire electrodes with a diameter of φ0.2 mm or more. However, compared to fluid transfer methods, the overall size is larger. Furthermore, when transporting wire electrodes with smaller diameters, the load applied to the wire electrode is relatively large, making wire breakage, tangling, and detachment more likely.

[0005] Patent documents 2 and 3 representatively disclose wire electrical discharge machining (EDM) apparatuses that include a fluid transfer method. Generally, fluid transfer methods involve filling a conduit with high-pressure fluid and then using a suction device to draw the fluid and wire electrode together to deliver the wire electrode. Therefore, in the case of a large-diameter wire electrode with high rigidity and a tendency to curl, the tip of the wire electrode can easily snag in the conduit and bend. Furthermore, in the case of a wire electrode with a small diameter, the wire electrode may adhere to the inner surface of the conduit and become immobile, which is unsuitable.

[0006] Patent Document 4 discloses a wire EDM apparatus equipped with a conveying device for fluid transfer without a conduit. The conveying device of the wire EDM apparatus disclosed in Patent Document 4 can move the wire electrode in one go solely by the constraint force of the fluid, thus further shortening the conveying time until the winding device captures the tip of the wire electrode. In the case of die sinking processing where the workpiece is immersed in the processing fluid, a cover is required to ensure the movement path of the wire electrode, which is moved solely by the constraint force of the fluid.

[0007] [Existing Technical Documents]

[0008] [Patent Literature]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 1-114924

[0010] [Patent Document 2] Japanese Patent Application Publication No. 1-135426

[0011] [Patent Document 3] Japanese Patent Application Publication No. 5-92322

[0012] [Patent Document 4] Japanese Patent No. 6605564 Summary of the Invention

[0013] [The problem the invention aims to solve]

[0014] In typical wire electrical discharge machining (EDM) apparatuses, the lower arm supporting the lower wire guide unit, which houses the lower wire guide, is positioned to penetrate the machining tank wall. Therefore, at least in the case of die machining where the workpiece is immersed in the machining fluid, a sealing device is needed between the lower arm and the machining tank wall to prevent leakage of the machining fluid from the machining tank. This sealing device suffers from problems such as sealing resistance causing adverse conditions during machining. Furthermore, the sealing structure of the sealing device complicates the structure around the machining tank.

[0015] The belt conveyor or guide tube of the conveying device is located along the outside of the lower arm or within the hollow of the lower arm. When the shape of the lower arm is changed to pass over the processing tank wall in order to remove the sealing structure, the movement path of the wire electrode is in an upward direction. Therefore, the configuration of the belt conveyor or guide tube needs to be changed to accommodate the change in the movement path of the wire electrode, or the shape of the conveyor or guide tube needs to be changed.

[0016] Therefore, when the lower arm is designed to change its shape so that it passes over the wall of the machining tank while allowing relative movement between the machining tank and the lower arm, in a conveying device with a transfer mechanism, the angle at which the wire electrode's movement direction changes is larger compared to a structure where the wire electrode's movement path is roughly horizontal. This makes the wire electrode more prone to breakage. In a fluid-transfer conveying device, the wire electrode, which tends to descend due to gravity, is lifted along an upward movement path, making it more susceptible to bending.

[0017] In view of the aforementioned problems, the main objective of this invention is to provide a wire electrical discharge machining (EDM) apparatus comprising a fluid transfer device with a conduit, wherein the lower arm and the conduit do not penetrate the machining tank wall. Several advantages obtainable by the EDM apparatus of this invention are shown in detail in the description of specific embodiments.

[0018] [Technical means to solve the problem]

[0019] To address the aforementioned issues, the wire electrical discharge machining (EDM) apparatus disclosed herein includes: a lower arm supporting a lower wire guide unit located in a machining groove; at least one steering pulley disposed on the lower arm below the lower wire guide unit; and a winding device comprising a pair of rollers disposed outside the machining groove. The wire EDM apparatus is characterized by comprising, as a conveying device,: a conduit disposed between the at least one steering pulley and the winding device along a movement path of the wire electrode, internally including a first connecting passage for the wire electrode and a gas-liquid mixture containing gas and machining fluid, and having antistatic properties; a suction nozzle disposed downstream of the wire electrode in the feed direction of the winding device, internally including a second connecting passage for the wire electrode and the gas-liquid mixture and a first discharge passage for discharging the gas-liquid mixture; and a suction device connected to and discharging the gas-liquid mixture from the first discharge passage.

[0020] In particular, the wire electrical discharge machining apparatus of this disclosure is configured such that the conveying device includes a defoaming device, which defoams the gas-liquid mixture.

[0021] In addition, the conveying device disclosed herein is characterized in that it includes the suction nozzle as a first discharge device, and includes a second discharge device connected to the outlet of the wire electrode of the conduit, the second discharge device having internally a third connecting passage for the wire electrode and the gas-liquid mixture to pass through, and a second discharge passage for discharging the gas-liquid mixture, the second discharge passage being connected to the suction device.

[0022] The wire electrical discharge machining apparatus disclosed herein, which includes a conveying device and a control device, is characterized in that: the conveying device includes a first cylinder device connected to the suction nozzle; the control device drives the first cylinder device to move the suction port of the suction nozzle from downstream of the feed direction of the wire electrode of the winding device, which is the initial position, through the pair of rollers to a position connected to the outlet of the wire electrode of the first connecting path.

[0023] Furthermore, the wire electrical discharge machining apparatus disclosed herein, including a conveying device and a control device, is characterized in that: the conveying device includes a gas-liquid mixing port, which is disposed upstream of the wire electrode in the feed direction of the conduit, to introduce gas into the wire electrical discharge machining apparatus; the control device drives the suction device to mix the gas flowing in from the gas-liquid mixing port with the processing liquid to generate a gas-liquid mixed fluid; the gas-liquid mixed fluid passing through the first connecting passage and the second connecting passage, as well as the front end of the wire electrode that is delivered together with the gas-liquid mixed fluid, is drawn from the inlet of the wire electrode in the first connecting passage; and the gas-liquid mixed fluid is discharged from the first discharge passage.

[0024] Furthermore, the wire electrical discharge machining apparatus disclosed herein, which includes a conveying device and a control device, is characterized in that: the pair of rollers are arranged at the outlet of the wire electrode in the first connecting path with the moving path of the wire electrode as the center; the wire electrical discharge machining apparatus includes a second cylinder device, which is connected to the pair of rollers; and the control device drives the second cylinder device to open and close the pair of rollers relative to each other with the moving path of the wire electrode as the center, thereby clamping the wire electrode discharged from the outlet of the wire electrode in the first connecting path.

[0025] Furthermore, the wire electrical discharge machining apparatus disclosed herein, which includes a conveying device and a control device, is characterized in that the control device switches the connection between the first discharge device and the suction device, and the connection between the second discharge device and the suction device, based on the diameter value of the wire electrode.

[0026] [The effects of the invention]

[0027] With this invention, a wire electrode can be delivered along with a gas-liquid mixture of processing fluid and air within a conduit that has antistatic properties and a smooth inner surface. Therefore, it is less likely that fine wire electrodes with a wire diameter of φ0.2 mm or less, especially extremely fine wire electrodes with a wire diameter of φ0.1 mm or less, will adhere to the inner surface of the conduit or become hooked at the front end of the wire electrode and unable to move during the period before being captured by the winding roller.

[0028] Therefore, during automatic wiring, even if the wire electrode moves in the conveying device in the so-called upward direction from bottom to top, the wire electrode can still be moved so that the winding device can more reliably capture and wind the wire electrode. As a result, the conduit of the conveying device can be installed without penetrating through the machining tank wall, eliminating the need for sealing devices installed on the machining tank wall. Attached Figure Description

[0029] Figure 1 This is a schematic diagram showing the overall structure of the wire electrical discharge machining apparatus of the present invention.

[0030] Figure 2 This is a schematic diagram illustrating the conveying device of the wire electrical discharge machining apparatus of the present invention.

[0031] Figure 3 This is a diagram showing the circuit structure of the suction device and defoaming device of the conveying device of the wire electrical discharge machining apparatus of the present invention.

[0032] Figure 4A and Figure 4B This diagram illustrates the operation of the winding device and the conveying device of the wire electrical discharge machining apparatus of the present invention.

[0033] Figures 5A to 5D This diagram illustrates the operation of the winding device and the conveying device of the wire electrical discharge machining apparatus of the present invention.

[0034] Figure 6 This is another example of the gas-liquid mixing port of the wire electrical discharge machining apparatus of the present invention.

[0035] Figure 7 This is a block diagram of the wire electrical discharge machining apparatus of the present invention.

[0036] Figure 8 This is a schematic diagram showing the structure of the first discharge device of the wire electrical discharge machining apparatus of the present invention.

[0037] Figure 9 This is a schematic diagram showing the structure of the second discharge device of the wire electrical discharge machining apparatus of the present invention.

[0038] Figure 10 This is a schematic diagram showing the structure of the blower of the wire electrical discharge machining apparatus of the present invention.

[0039] Figure 11 This is a schematic diagram showing the structure of the winding device of the wire electrical discharge machining apparatus of the present invention.

[0040] Figure 12 This is another example of the conveying device of the wire electrical discharge machining apparatus of the present invention.

[0041] Figure 13 This is another example of the first discharge device of the wire electrical discharge machining apparatus of the present invention.

[0042] Figure 14 This is a schematic diagram showing the structure of the winding device of the wire electrical discharge machining apparatus of the present invention.

[0043] [Explanation of Symbols]

[0044] 1: Mobile device

[0045] 2: Automatic wiring device

[0046] 2A: Feeding roller

[0047] 2B: Catheter

[0048] 3: Line guide unit

[0049] 3A: Upper side line guide unit

[0050] 3B: Lower side line guide unit

[0051] 4: Machining tank

[0052] 5: Lower arm

[0053] 6: Column

[0054] 7: Processing fluid storage tank

[0055] 8: Defoaming device

[0056] 10: Steering pulley

[0057] 11: Supply device

[0058] 11B: spool

[0059] 12: Tension device

[0060] 12A: Drive roller

[0061] 12M: Servo motor

[0062] 13: Recycling device

[0063] 13A: Winding device

[0064] 13B: Hopper

[0065] 13C: Water control plate

[0066] 13D: Drive Roller

[0067] 13M: Winding motor

[0068] 13T: Driven roller

[0069] 14: Transport device

[0070] 14A: Catheter

[0071] 14B: First discharge device

[0072] 14C: Second discharge device

[0073] 14F: Blower

[0074] 14V: Gas-liquid mixing port

[0075] 20: Guide Block

[0076] WE: Line Electrode

[0077] WP: Workpiece Detailed Implementation

[0078] Figure 1 This section presents an overall overview of the wire electrical discharge machining apparatus of the present invention. Figure 7 A block diagram showing a wire electrical discharge machining (EDM) apparatus. Figure 1 In order to represent the entire moving path of the wire electrode with a single surface, the supply side of the wire electrode is represented by a view from the front of the machine, and the recovery side of the wire electrode is represented by a view from the left side of the machine. Figure 1 This is a schematic diagram. Figure 1 The relative dimensions and positional relationships of several structural components are not accurately represented relative to the actual object. Furthermore, Figure 1 This refers to a wire electrical discharge machining (EDM) device that uses an oil-based EDM fluid to immerse and process the workpiece through a die-cutting process.

[0079] For convenience, the wire electrode is positioned relative to the wire electrode feed direction 301 ( Figure 1 The side where the wire electrode enters (indicated by the arrow) is simply referred to as the "upstream side", and the side where the wire electrode exits (downstream side) is simply referred to as the "downstream side".

[0080] First of all, Figure 1 The overall structure of the wire EDM apparatus according to the illustrated embodiment will be described. The wire EDM apparatus of this embodiment includes at least a transfer device 1, an automatic wiring device 2, a wire guide unit 3, a control device 91, a power supply device 92, and a relative movement device 93. The part in which the transfer device 1, the automatic wiring device 2, the wire guide unit 3, and the relative movement device 93 are provided is referred to as the machine body.

[0081] The transfer device 1 is a device that supplies unused wire electrodes WE during processing to the processing gap GP formed between the wire electrodes WE and the workpiece WP, and retrieves the used wire electrodes WE supplied during processing. The transfer device 1 includes a supply device 11, a tension device 12, a retrieval device 13, and a conveying device 14. The supply side 1A, which includes the wire electrodes WE, extends from the supply device 11 through the tension device 12 and the automatic wiring device 2 to the upper wire guide unit 3A, and the retrieval side 1B, which includes the wire electrodes WE, extends from the lower wire guide unit 3B through the conveying device 14 to the retrieval device 13.

[0082] The automatic wiring device 2 is a device for automatically setting up the wire electrode WE. The automatic wiring device 2 of the wire electrical discharge machining apparatus of this embodiment includes a feed roller 2A, a guide tube 2B, and a cutter 2C. The feed roller 2A is a component that feeds the wire electrode WE by rotating a feed motor 2M. The guide tube 2B is a component that guides the tip of the wire electrode WE to the upper wire guide unit 3A. The cutter 2C is a component that cuts the wire electrode WE. For example, the cutter 2C can be replaced with other components that cut the wire electrode WE, such as a heating roller that melts the wire electrode with heat.

[0083] The wire guide unit 3 is composed of an upper wire guide unit 3A and a lower wire guide unit 3B. The upper and lower wire guide units 3A and 3B are integrated components that form a wire guide that positions and guides the wire electrode WE, which is equivalent to the main body of the guide, a power supply body that supplies power to the wire electrode WE, and a machining fluid jet nozzle that supplies machining fluid jets to the machining gap GP.

[0084] The control device 91 is a device for controlling the operation of the wire electrical discharge machining (EDM) apparatus. The control device 91 is connected to the transfer device 1, the automatic wiring device 2, the power supply device 92, and the relative movement device 93 via one or more signal lines, thereby executing predetermined sequential actions. Additionally, the control device 91 controls the defoaming device 8. The control device 91 includes a numerical control unit that executes specific actions of each device according to a numerical control (NC) program, and arbitrarily controls the overall operation of the wire EDM apparatus to perform the desired machining.

[0085] The power supply device 92 is a device that continuously supplies discharge current pulses with the desired waveform and peak current value to the machining gap GP. The relative movement device 93 is a device that moves the wire electrode WE relative to the workpiece WP in a horizontal biaxial direction. The relative movement device 93 includes a conical device that tilts the wire electrode WE relative to the workpiece WP.

[0086] The machining tank 4 is a component that contains the workpiece WP. Additionally, the machining tank 4 is a component that contains machining fluid. When machining the workpiece WP while it is exposed to air using a flushing method that injects machining fluid into the machining gap GP, the machining tank wall prevents the machining fluid from splashing, and the machining tank 4 functions as a splash guard. When machining the workpiece WP by immersing it in machining fluid using a molding method, the machining tank wall prevents the machining fluid from leaking out; as its name suggests, the machining tank 4 functions as a container.

[0087] The lower arm 5 is a component that supports the lower wire guide unit 3B at its front end. The lower arm 5 is suspended and fixed to a mechanical structure (not shown) located above the column 6 and outside the machining groove 4. The front end of the lower arm 5 is positioned below the workpiece WP disposed within the machining groove 4. The lower arm 5 is configured to be movable relative to the machining groove 4. Therefore, in the wire EDM apparatus of this embodiment, since the lower arm 5 is a structure that does not penetrate the machining groove wall on the back side of the machining groove 4, a sealing device to prevent leakage of machining fluid is not required between the lower arm 5 and the machining groove 4.

[0088] A guide pulley 10 is rotatably mounted on a guide block 20, which is fixedly positioned at the front end of the lower arm 5 directly below the lower wire guide unit 3B. The guide pulley 10 redirects the travel direction of the wire electrode WE, which moves in a direction perpendicular to the workpiece WP's mounting surface, towards the winding device 13A located outside the machining groove 4. Furthermore, multiple guide pulleys 10 can be provided to coordinate with the movement path of the wire electrode WE.

[0089] Next, the transfer device 1 of the wire electrical discharge machining apparatus according to the embodiment will be described in more detail. The supply device 11 of the transfer device 1 is a device that supplies the wire electrode WE to the machining gap GP. The supply device 11 includes a spool 11A, a spool 11B, a servo pulley 11F, and a servo motor 11M. The spool 11B is a replaceable consumable that winds a wire electrode WE of a predetermined length around the spool and stores it. The spool 11B is loaded onto the spool 11A and rotates.

[0090] The spool 11A rotates at a speed caused by a servo motor 11M in conjunction with a tension device 12, continuously pulling the wire electrode WE from the spool 11B. The servo motor 11M can be replaced with a brake, such as a torque motor or a powder clutch. The servo pulley 11F moves up and down. By controlling the up-and-down position of the servo motor 11M in conjunction with the servo pulley 11F, the rotation of the spool 11B changes, thereby feeding the wire electrode WE more smoothly.

[0091] The tension device 12 is a device that draws the wire electrode WE from the winding drum 11B and sequentially feeds it to the processing gap GP. Additionally, the tension device 12 applies a predetermined tension to the wire electrode WE supplied to the processing gap GP between the winding drum and the recovery device 13. The tension 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 breakage detector. Furthermore, in a device structure where wire breakage can be detected simultaneously by the tension detector and the tension, the limit switch 12L is not required.

[0092] The drive roller 12A also serves as a feed roller for pulling the wire electrode WE from the spool 11B and feeding it to the processing gap GP, and as a tension roller for applying a predetermined tension to the wire electrode WE. The wire electrode WE is wound around the outer periphery of the drive roller 12A via the driven roller 12B and the pinch roller 12C. The drive roller 12A is rotated by a servo motor 12M. The control device 91 controls the rotational speed of the servo motor 12M based on the tension detected by the strain gauge 12T to maintain a constant tension.

[0093] The recycling device 13 is a device for recycling used wire electrodes WE. Furthermore, the recycling device 13 is a device that moves the wire electrodes WE at a constant speed. The recycling device 13 can separate and recycle the used wire electrodes WE from the liquid. The recycling device 13 includes a winding device 13A and a hopper 13B.

[0094] The winding device 13A of the recycling device 13 includes: a pair of rollers, a drive roller 13D that rotates by a winding motor 13M and a driven roller 13T that contacts and rotates with the drive roller 13D; and a second cylinder device 13E for opening and closing the pair of rollers 13D and 13T. The winding device 13A clamps a wire electrode WE between the pair of rollers 13D and 13T, causing the wire electrode WE to move at a certain moving speed. The pair of rollers 13D and 13T have their back surfaces as shown... Figure 11 As shown, they are respectively connected to the second cylinder device 13E, driving the second cylinder device 13E to move in a direction of separation, thereby opening and closing freely. When the pair of rollers 13D and 13T are open, the wire electrode WE can be released from the constraint, and at the same time, the obstruction is substantially removed from the migration path (movement path) of the wire electrode WE.

[0095] The winding device 13A is positioned outside the processing groove 4. Additionally, a pair of rollers 13D and 13T are provided on the upstream side of the second discharge device 14C near the outlet of the wire electrode WE of the fourth connecting path 14P via the connecting member 13F, centered on the moving path of the wire electrode WE.

[0096] like Figure 14As shown, a pair of rollers 13D and 13T are respectively mounted on the connecting member 13F and are mounted on the wire EDM apparatus via the connecting member 13F. In addition, rollers 13D and 13T are connected to each other by a linkage mechanism 13G mounted on the connecting member 13F.

[0097] Specifically, the second cylinder assembly 13E is an electric cylinder, a pneumatic cylinder, or a hydraulic cylinder. When the second cylinder assembly 13E is an electric cylinder, it includes a motor, a ball screw, a nut embedded in the ball screw, a rod fixed to the nut, and a frame housing them. The ball screw is rotated by driving the motor, causing the nut and rod to reciprocate within the frame. Alternatively, when the second cylinder assembly 13E is a hydraulic cylinder, it includes a frame, a piston disposed within the frame, a rod fixed to the piston, and a hydraulic pump that supplies pressurized oil to the frame. Pressurized oil is supplied from the hydraulic pump to the frame, causing the piston and rod to reciprocate within the cylinder.

[0098] A connecting member 13F for roller 13D is installed at the front end of the rod, and a connecting member 13F for roller 13T is installed at the end of the frame. When the rod moves forward within the frame, the connecting member 13F moves, and rollers 13D and 13T separate from each other. On the other hand, when the rod moves backward within the frame, the connecting member 13F moves, and rollers 13D and 13T come into close contact.

[0099] The winding motor 13M, which rotates the drive roller 13D, maintains a predetermined rotational speed that is faster than the rotational speed of the servo motor 12M of the tension device 12. By generating a speed difference between the drive roller 12A and the winding device 13A of the tension device 12, the wire electrode WE is moved at a predetermined transfer speed while a tension corresponding to the speed difference between the drive roller 12A and the winding device 13A is applied to the wire electrode WE.

[0100] The hopper 13B of the recovery device 13 is a recovery box for recovering the wire electrode WE. A water control plate 13C, such as a metal mesh, is installed in the hopper 13B to separate and recover the processing fluid adhering to and discharged from the wire electrode WE from the front end of the suction nozzle 14N or the outlet of the wire electrode WE in the third connecting passage. When it is desired to finely cut and recover the wire electrode WE, the water control plate 13C can be replaced with a fine-pore filter.

[0101] The hopper 13B is positioned below the suction nozzle 14N, which will be described later. This is because, especially in the wiring operation of extremely fine wire electrodes WE with a diameter of less than 0.1 mm, a small amount of processing fluid may drip from the tip of the suction nozzle 14N after the wiring operation, thus allowing the processing fluid to be recovered.

[0102] Figure 2 This describes a powerful embodiment of the conveying device of the wire electrical discharge machining apparatus of the present invention. Figure 2 and Figure 1 Although both are schematic diagrams, the relative dimensions and positional relationships of multiple structural components are not accurate relative to the actual object. Furthermore, Figure 3 A simplified and schematic diagram illustrates the circuitry for the supply and discharge of a gas-liquid mixture in a conveying device. The following uses... Figures 1 to 3 The specific structure of the conveying device is described. Furthermore, Figure 3 For components that are not directly related to this invention, illustrations and descriptions are omitted.

[0103] The conveying device 14 is used to guide the decommissioned wire electrode WE, after it has been redirected upwards by the steering pulley 10, to the outside of the machining tank 4. The conveying device 14 includes a conduit 14A, a first discharge device 14B, a second discharge device 14C, and a blower 14F. Figure 3 The defoaming device 8 and the suction device 14E shown are illustrated.

[0104] Specifically, in the wire electrical discharge machining apparatus of the embodiment, the first discharge device 14B and the second discharge device 14C of the conveying device 14 are respectively connected to the suction device 14E located near the machining fluid storage tank 7. By supplying machining fluid to the suction device 14E, a negative pressure is generated, and machining fluid containing air bubbles is drawn through the first discharge device 14B or the second discharge device 14C and discharged into the clear liquid tank 7B.

[0105] Figure 8 This is a schematic diagram showing the structure of the first discharge device 14B. For convenience, Figure 8 The internal structure is shown in dashed lines to illustrate the structure of the suction nozzle 14N and the connecting component 14M.

[0106] The first discharge device 14B includes a connecting component 14M, a suction nozzle 14N, a first cylinder assembly 14S, and an arm 14L. The first discharge device 14B causes the winding device 13A to capture the gas-liquid mixture with the wire electrode WE, such as... Figure 1 As shown, the wire electrode WE is guided to the rear of the winding device 13A.

[0107] The suction nozzle 14N is a cylindrical component, internally including a through, straight second connecting passage 14J for inserting the wire electrode WE and the gas-liquid mixture. A connecting member 14M is connected to the outlet side of the wire electrode WE of the suction nozzle 14N.

[0108] The connecting component 14M internally includes a linear fourth connecting passage 14P through which the supply electrode WE and the gas-liquid mixture pass, and a first discharge passage 14K through which the gas-liquid mixture passes. The downstream side of the second connecting passage 14J is connected to the upstream side of the fourth connecting passage 14P. In addition, one end of the first discharge passage 14K is connected to the fourth connecting passage 14P, and the other end is connected to the suction device 14E.

[0109] The suction port 14W of the suction nozzle 14N is located on the outlet side of the wire electrode WE of the winding device 13A. The suction nozzle 14N is coaxially arranged with the first communication passage 14R of the conduit 14A such that the suction port 14W is located on the moving path of the wire electrode WE.

[0110] One end of the arm 14L is connected to the opposite side of the first discharge path 14K of the connecting member 14M. The other end of the arm 14L is fixed to the first cylinder device 14S, for example, the rod of the first cylinder device 14S. Through the action of the first cylinder device 14S, the arm 14L, the connecting member 14M, and the suction nozzle 14N move reciprocally as a whole.

[0111] The suction nozzle 14N moves linearly back and forth from its initial position, which is coaxial with the first communication path 14R of the conduit 14A and is positioned so as not to obstruct the discharge of the line electrode WE, until it approaches or contacts the outlet of the third communication path 14G of the second discharge device 14C, i.e., the position of the forward limit.

[0112] The arm 14L is a component used to connect the first cylinder block device 14S, the connecting component 14M, and the suction nozzle 14N, and is, for example, in an L-shape.

[0113] The suction nozzle 14N moves forward along the path of the wire electrode WE, and connects to the outlet of the third communication channel 14G of the second discharge device 14C through the pair of rollers 13D and 13T when the pair of rollers 13D and 13T are in the open state. Then, it suctions the gas-liquid mixture and the tip of the wire electrode WE that is fed along with the gas-liquid mixture, capturing the tip of the wire electrode WE. At this time, the suction nozzle 14N stops suctioning the wire electrode WE and the gas-liquid mixture, retracts to its original position, and the winding device 13A clamps the wire electrode WE. Then, when the first discharge device 14B retracts to its original position, automatic wiring is completed. The gas-liquid mixture suctioned by the suction device 14E and through the first discharge device 14B and the second discharge device 14C is discharged to the defoaming device 8.

[0114] Specifically, the first cylinder assembly 14S is an electric cylinder, a pneumatic cylinder, or a hydraulic cylinder. When the first cylinder assembly 14S is an electric cylinder, it includes a motor, a ball screw, a nut embedded in the ball screw, a rod fixed to the nut, and a frame housing them. The ball screw is rotated by driving the motor, causing the nut and rod to reciprocate within the frame. Alternatively, when the first cylinder assembly 14S is a hydraulic cylinder, it includes a cylinder tube, a piston disposed within the cylinder tube, a rod fixed to the piston, and a hydraulic pump for supplying pressurized oil to the cylinder tube. Pressurized oil is supplied from the hydraulic pump to the cylinder tube, causing the piston and rod to reciprocate within the cylinder.

[0115] Figure 9 This is a schematic diagram showing the structure of the second discharge device 14C. For convenience, Figure 9 The internal structure is shown in dashed lines to illustrate the structure of the second discharge device 14C and the conduit 14A.

[0116] The second discharge device 14C is a component used to connect the suction device 14E to the conduit 14A. Internally, it includes a straight third connecting passage 14G through which the wire electrode WE and the gas-liquid mixture pass, and a second discharge passage 14H through which the gas-liquid mixture passes. One end of the second discharge passage 14H is connected to the third connecting passage 14G, and the other end is connected to the suction device 14E.

[0117] One downstream end of conduit 14A is connected to the inlet side of the wire electrode WE of the second discharge device 14C. The first connecting passage 14R of conduit 14A is connected to the third connecting passage 14G of the second discharge device 14C. The first connecting passage 14R of conduit 14A and the third connecting passage 14G of the second discharge device 14C are coaxially arranged and connected in a straight line.

[0118] In addition, on the upstream side of the second discharge device 14C, a pair of rollers 13D and 13T are arranged with the moving path of the wire electrode WE as the center.

[0119] The second discharge device 14C discharges the front end of the wire electrode WE from the outlet of the wire electrode WE in the third connecting passage 14G, causing the winding device 13A to capture the wire electrode WE, as shown. Figure 1 As shown, the wire electrode WE is guided to the rear of the winding device 13A.

[0120] The first discharge device 14B and the second discharge device 14C operate selectively. The first discharge device 14B operates when the wire electrode WE has a smaller diameter. In this case, the second discharge device 14C is not used. The second discharge device 14C is used when the wire electrode WE has a larger diameter. In this case, the first discharge device 14B does not operate. The control device 91 switches between the control valve V1 connected between the first discharge path 14K and the suction device 14E, and the control valve V2 located between the second discharge path 14H and the suction device 14E, thereby switching between the first discharge device 14B and the second discharge device 14C.

[0121] The guide tube 14A is positioned between the guide pulley 10 and the winding device 13A along the movement path of the wire electrode WE, and is inclined with reference to the horizontal direction when the wire EDM device is installed. Specifically, with reference to the horizontal direction of the wire EDM device, the inclination angle of the guide tube 14A is, for example, 13 degrees.

[0122] The conduit 14A is an elongated cylindrical member that guides the movement of the wire electrode WE between the steering pulley 10 and the winding device 13A, and has a first connecting passage 14R inside for the insertion of the wire electrode WE. The conduit 14A is antistatic, and the inner surface of the conduit 14A constituting the first connecting passage 14R is as smooth as possible.

[0123] When the wire electrode WE is fed from bottom to top, a force sufficient to lift the wire electrode is required compared to when the wire electrode WE is moved horizontally. Of course, when the wire electrode WE comes into contact with the inner surface of the catheter 14A and friction occurs, static electricity will be generated. In particular, when the wire electrode WE is an extremely fine wire electrode with a diameter of less than 0.1 mm, the wire electrode WE can easily adhere to the inner surface of the catheter 14A by the charged electrostatic force.

[0124] In the wire electrical discharge machining apparatus of the present invention, since the conduit 14A of the conveying device 14 has antistatic properties, the wire electrode WE can be prevented from adhering to the inner surface of the conduit 14A due to electrostatic force. Moreover, because the inner surface of the conduit 14A is smooth, the friction between the wire electrode WE and the conduit 14A is small, and the wire electrode WE is less likely to hook onto the inner surface of the conduit 14A.

[0125] To maintain antistatic properties over a long period, conduit 14A is ideally a conduit made from a raw material with high electrical insulation properties that incorporates a conductive antistatic material. If the material is electrically insulating, it is difficult to remove static electricity through grounding. Alternatively, conduit 14A can be used with an antistatic material coated on its surface, but this may result in a loss of sufficient antistatic properties within a relatively short period. Furthermore, conduit 14A is ideally made of a material with a smooth inner surface and wear resistance. For example, conductive mullite ceramic is effective as a material that possesses antistatic properties, a smooth inner surface, and wear resistance.

[0126] The suction device 14E is a device for suctioning gas-liquid mixtures, specifically an ejector, an aspirator, or a vacuum generator.

[0127] Figure 10 This is a schematic diagram showing the structure of blower 14F. For convenience, Figure 10 The internal structure is shown in dashed lines to illustrate the structure of blower 14F.

[0128] Blower 14F is a component that forms an air layer between the wire electrode WE and the surface of the roller to prevent the extremely fine wire electrode WE, which passes between a pair of rollers 13D and 13T of the winding device 13A, from sticking to the surface of the roller due to the force of the air.

[0129] In addition, the blower 14F is a cylindrical component with a through hole 14Q inside, and its central axis is set coaxially with the moving path of the wire electrode WE.

[0130] When wiring is being performed using the first discharge device 14B, the suction nozzle 14N moves along the moving path of the wire electrode WE and is inserted into the through hole 14Q of the blower 14F.

[0131] The gas-liquid mixture discharged from the first discharge path 14K and the second discharge path 14H is introduced into the defoaming device 8 via the suction device 14E. The defoaming device 8 in this embodiment is, for example, a cyclone-type defoaming device. The defoaming device 8 introduces the gas-liquid mixture into the container in a high-speed vortex-forming manner, exhausts air from the upper surface of the container, and exhausts the denser processing fluid from the bottom side of the container. The processing fluid is returned to the clear liquid tank 7B of the processing fluid storage tank 7. By defoaming the gas-liquid mixture, obstacles caused by processing fluid containing air bubbles can be prevented. For example, calibration can be prevented, thereby allowing for the safe reuse of the processing fluid.

[0132] like Figure 3 As shown, the machining fluid storage tank 7 in the wire electrical discharge machining apparatus, which supplies and recovers the machining fluid, has at least a sludge tank 7A and a clean fluid tank 7B. The machining fluid storage tank 7 can purify the contaminated machining fluid recovered to the sludge tank 7A and store it in the clean fluid tank 7B. The purified machining fluid is supplied for machining and used when generating new gas-liquid mixtures.

[0133] In the processing fluid storage tank 7, the processing fluid from the sludge tank 7A is pumped through the filter FT by pump P1 to the clean fluid tank 7B. The processing fluid pumped from the clean fluid tank 7B to the processing fluid inlet 3D in the lower line guide unit 3B via pump P2, and the downward-sprayed processing fluid passes through the guide pulley 10 to reach the gas-liquid mixing port 14V connected to the upstream end of the conduit 14A. Air flows into the gas-liquid mixing port 14V through the suction device 14E. Additionally, air reaches the gas-liquid mixing port 14V from the upper side of the guide pulley 10 via a pipeline. The negative pressure generated by the processing fluid drawn by the suction device 14E mixes air into the processing fluid, causing the gas-liquid mixture to flow into the inlet of the line electrode WE of the first connecting passage 14R.

[0134] Normally, compared to liquids, gases exert less force on the linear electrode WE. On the other hand, when the linear electrode WE moves with the liquid flow, it tends to adhere to the smooth inner surface of the conduit 14A due to surface tension. In this invention, it has been found that, particularly when the linear electrode WE is an extremely fine wire, the transport capacity of the gas-liquid mixture is higher than that of a liquid. Furthermore, when the linear electrode WE is an extremely fine wire, it is less likely to adhere to the inner surface of the conduit 14A when passing through the gas-liquid mixture, thus possessing straight-line properties.

[0135] Regarding gas-liquid mixtures, the line electrode WE can be moved more effectively when the air is mixed uniformly in the processing fluid as bubbles as possible. However, even when the processing fluid and air are separated into two layers, the line electrode WE can still be moved more effectively, and the effect is maintained in the aforementioned respect.

[0136] (Automatic wiring method using the first discharge device)

[0137] Next, use Figures 1 to 5A ~ Figure 5D The operation of the wire EDM apparatus during automatic wiring in the embodiment will be explained in detail. Figure 4A , Figure 4B and Figures 5A to 5D From Figure 2 The conveying device shown is illustrated after the portion of the winding device that winds and retracts the wire electrode has been pulled out. When Figures 1 to 5A ~ Figure 5D When the symbols attached to the structural elements shown are the same, they represent the same structural element.

[0138] Before automatic wiring begins, the front end of the wire electrode WE must be at least located at a relatively... Figure 1 The feed roller 2A of the automatic wiring device 2 shown is located closer to the processing gap GP side. The control device 91 drives the second cylinder device 13E as follows: Figure 5A As shown, open as Figure 4A The pair of rollers 13D and 13T of the winding device 13A of the recycling device 13 are in a closed and mutually contacted state as shown.

[0139] Next, as Figure 4B As shown, the control device 91 drives the first cylinder assembly 14S of the conveying device 14, causing the suction nozzle 14N of the first discharge device 14B to move forward. Here, "moving forward" means moving in the opposite direction to the feed direction 301 of the wire electrode WE.

[0140] The suction nozzle 14N passes through the through hole 14Q of the blower 14F. Then, when the suction nozzle 14N passes between a pair of rollers 13D and 13T, and the suction port 14W of the suction nozzle 14N advances to a position close to or in contact with the outlet of the third connecting passage 14G of the second discharge device 14C, the movement of the suction nozzle 14N stops.

[0141] As automatic wiring begins, the control device 91 supplies compressed air into the conduit 2B while positioning the conduit 2B of the automatic wiring device 2 at a predetermined height.

[0142] Additionally, the control device 91 activates the suction device 14E, drawing in processing fluid from the processing fluid inlet 3D and air from the gas-liquid mixing port 14V, thus mixing the air into the processing fluid and generating a gas-liquid mixed fluid. The gas-liquid mixed fluid flows sequentially through the first connecting path 14R, the third connecting path 14G, the second connecting path 14J, and the fourth connecting path 14P.

[0143] The gas-liquid mixture then flows from the first discharge path 14K into the defoaming device 8 via the suction device 14E. The defoaming device 8 defoams the incoming gas-liquid mixture and discharges the processing fluid into the clear liquid tank 7B of the processing fluid storage tank 7.

[0144] As automatic wiring begins, control device 91 causes the feed roller 2A of automatic wiring device 2 to rotate at a predetermined speed along the feed direction. Control device 91, in conjunction with the movement of the wire electrode WE, causes the guide tube 2B to descend. Compressed air flows through the guide tube 2B, so the wire electrode WE, with its tip pointing downwards, is guided by the guide tube 2B to the upper wire guide unit 3A without getting caught on the inner wall of the guide tube 2B.

[0145] The front end of the line electrode WE reaches the lower line guide unit 3B and passes through the lower line guide. The line electrode WE, without leaving the travel path formed on the guide block 20, reaches the groove-shaped travel path formed between the steering pulley 10 and the guide block 20.

[0146] When the tip of the wire electrode WE reaches the gas-liquid mixing port 14V, the wire electrode WE is drawn upwards along with the gas-liquid mixture in the first connecting passage 14R of the conduit 14A. The wire electrode WE... Figure 5B As shown, the gas-liquid mixture flows without bending along the way, and reaches the second connecting path 14J in one go through the first connecting path 14R and the third connecting path 14G.

[0147] When a sensor (not shown) detects that the wire electrode WE passes between a pair of rollers 13D, 13T of the winding device 13A, as Figure 5C As shown, the control device 91 drives the first cylinder device 14S of the conveying device 14 to retract the suction nozzle 14N and the first discharge device 14B as a single unit. Here, "retracting" refers to moving in the feed direction 301 of the wire electrode WE.

[0148] The control device 91 stops the movement of the suction nozzle 14N when it passes between a pair of rollers 13D and 13T and retracts to its initial position.

[0149] Next, as Figure 5D As shown, the control device 91 drives the second cylinder device 13E to close the pair of rollers 13D and 13T of the winding device 13A, so that the pair of rollers 13D and 13T clamp the wire electrode WE.

[0150] When automatic wiring is completed, the control device 91 returns the automatic wiring device 2 to its initial position and restarts the process. Furthermore, when automatic wiring is completed, the control device 91 stops the operation of the first discharge device 14B, the defoaming device 8, and the conveying device 14.

[0151] (Automatic wiring method that combines the first and second discharge devices)

[0152] Next, the operation of the first discharge device 14B and the second discharge device 14C of the wire electrical discharge machining apparatus according to the embodiment will be specifically explained.

[0153] The control device 91 obtains the diameter value of the wire electrode WE based on the information of the wire electrode WE input by the operator using the display input device 94 or the information of the wire electrode WE automatically identified by the wire EDM device. If the obtained diameter value of the wire electrode WE is above a reference value, the control device 91 determines that the second discharge device 14C should be used; if the diameter value of the wire electrode is below the reference value, it determines that the first discharge device 14B should be used. The control device 91 switches between the first discharge device 14B and the second discharge device 14C by switching the control valve V1 connected between the first discharge path 14K and the suction device 14E and the control valve V2 provided between the second discharge path 14H and the suction device 14E.

[0154] When using the first discharge device 14B, the control device 91 opens the control valve V1 connected between the first discharge path 14K and the suction device 14E, and closes the control valve V2 located between the second discharge path 14H and the suction device 14E.

[0155] The automatic wiring method for using the first discharge device 14B thereafter is as described in (Automatic Wiring Method for Using the First Discharge Device), therefore the description is omitted.

[0156] Furthermore, the operation from the front end of the wire electrode WE to the lower wire guide unit 3B is also as described in (Automatic Wiring Method Using the First Discharge Device), so the description is omitted.

[0157] When using the second discharge device 14C, the control device 91 closes the control valve V1 connected between the first discharge path 14K and the suction device 14E, and opens the control valve V2 located between the second discharge path 14H and the suction device 14E.

[0158] In addition, control device 91 such as Figure 4A The second cylinder device 13E is driven to close the pair of rollers 13D and 13T of the winding device 13A and keep them in contact with each other. The first discharge device 14B stops at its initial position.

[0159] The control device 91 activates the suction device 14E of the conveying device 14, drawing in processing fluid from the processing fluid inlet 3D and air from the gas-liquid mixing port 14V, thus mixing the air into the processing fluid and generating a gas-liquid mixed fluid. The gas-liquid mixed fluid flows sequentially in the first connecting path 14R and the third connecting path 14G.

[0160] The gas-liquid mixture then flows from the second discharge path 14H into the defoaming device 8 via the suction device 14E. The defoaming device 8 defoams the incoming gas-liquid mixture and discharges the processing fluid into the clear liquid tank 7B of the processing fluid storage tank 7.

[0161] When the tip of the wire electrode WE reaches the gas-liquid mixing port 14V, the wire electrode WE is drawn upwards along with the gas-liquid mixture in the first connecting passage 14R of the conduit 14A. The wire electrode WE... Figure 5D As shown, the flow of the gas-liquid mixture does not bend midway, but passes through the first connecting path 14R and the third connecting path 14G in one go. In this state, the front end of the line electrode WE is connected between a pair of rollers 13D and 13T that are kept closed by utilizing the rigidity of the line electrode WE.

[0162] When automatic wiring is completed, the control device 91 returns the automatic wiring device 2 to its initial position and restarts the process. Furthermore, when automatic wiring is completed, the control device 91 stops the operation of the defoaming device 8 and the conveying device 14.

[0163] (Another example)

[0164] In the embodiment, a device structure with a first discharge device 14B and a second discharge device 14C is described, but if only a wire electrode with a relatively small diameter is used, the second discharge device 14C may not be provided.

[0165] In the absence of the second discharge device 14C, such as Figure 12 As shown, a pair of rollers 13D and 13T are positioned outside the processing groove 4. Additionally, a pair of rollers 13D and 13T are positioned near the outlet of the wire electrode WE in the first connecting passage 14R via the connecting member 13F, centered on the moving path of the wire electrode WE.

[0166] Furthermore, the forward limit of the suction nozzle 14N of the first discharge device 14B is the position that approaches or contacts the outlet of the first connecting passage 14R of the conduit 14A, so that the suction port 14W of the suction nozzle 14N moves back and forth from the initial position to the position that connects with the outlet of the line electrode WE of the first connecting passage 14R.

[0167] In addition, in the embodiments, the following example is described: when using a wire electrode WE with a relatively small diameter, only the first discharge device 14B is used without the second discharge device 14C, but it is also possible to use both the first discharge device 14B and the second discharge device 14C.

[0168] In this case, the control device 91 opens both the control valve V1 connected between the first discharge path 14K of the first discharge device 14B and the suction device 14E, and the control valve V2 provided between the second discharge path 14H of the second discharge device 14C and the suction device 14E, and uses both the first discharge device 14B and the second discharge device 14C.

[0169] Furthermore, in the (automatic wiring method that combines the first discharge device and the second discharge device), the control device 91 determines whether to use the first discharge device 14B or the second discharge device 14C based on the diameter value of the wire electrode WE. However, the operator can manually select whether to use the first discharge device 14B or the second discharge device 14C through the display input device 94, etc.

[0170] Moreover, in the embodiments, such as Figure 3 As shown, the gas-liquid mixing port 14V is located at one end of the upstream side of the conduit 14A, but it can also be located as shown in the diagram. Figure 6 As shown, the gas-liquid mixing port 14V is located in a position connected to the guide block 20, specifically to the travel path 20A of the guide block 20.

[0171] In this way, air flows appropriately into the travel path 20A of the guide block 20.

[0172] Furthermore, in the embodiment, the first discharge device 14B includes a suction nozzle 14N and a connecting member 14M, but as Figure 13 The suction nozzle 14N and the connecting component 14M shown can also be integrally formed. In this case, a first discharge path 14K is provided in the suction nozzle 14N.

[0173] The present invention does not need to have the same structure as the wire electrical discharge machining apparatus described above. Although several examples have been shown, modifications, replacement of components, or combinations with other inventions are possible without departing from the technical concept of the present invention.

[0174] [Industry availability]

[0175] This invention can be applied to the field of electrical discharge machining (EDM). In this invention, the guide tubes in the lower arm and conveying device are not arranged to penetrate the machining tank wall in the online EDM apparatus. This invention eliminates the need for sealing devices from the machining tank wall, thus contributing to the development of EDM.

Claims

1. A wire electrical discharge machining apparatus, comprising: The lower arm supports the lower side line guide unit so that it is located in the machining groove; At least one steering pulley is disposed on the lower arm below the lower wire guide unit; and a winding device comprising a pair of rollers disposed outside the machining groove, the wire electrical discharge machining apparatus being characterized in that... As a conveying device, it includes: A conduit is provided along the movement path of the wire electrode between the at least one steering pulley and the winding device, and includes a first connecting passage for the wire electrode and a gas-liquid mixture containing gas and processing fluid to pass through, and has antistatic properties. A suction nozzle is located downstream of the wire electrode in the feeding direction of the winding device, and includes inside a second connecting passage for the wire electrode and the gas-liquid mixture to pass through and a first discharge passage for discharging the gas-liquid mixture. as well as A suction device is connected to the first discharge path and discharges the gas-liquid mixture from the first discharge path.

2. The wire electrical discharge machining apparatus according to claim 1, wherein the conveying device includes a defoaming device, the defoaming device defoaming the gas-liquid mixture.

3. The wire electrical discharge machining apparatus according to claim 1, characterized in that, The conveying device includes the suction nozzle as a first discharge device, and a second discharge device including a connection to the outlet of the wire electrode of the conduit. The second discharge device has a third connecting passage for the line electrode and the gas-liquid mixture to pass through, and a second discharge passage for discharging the gas-liquid mixture. The second discharge passage is connected to the suction device.

4. The wire discharge machining apparatus according to claim 1, wherein the conduit is made of conductive mullite ceramic.

5. The wire electrical discharge machining apparatus according to claim 1, wherein the suction device is an ejector or a suction device.

6. The wire electrical discharge machining apparatus according to claim 1, characterized in that, The wire electrical discharge machining apparatus includes a control device. The conveying device includes a first cylinder assembly, which is connected to the suction nozzle. The control device drives the first cylinder device to move the suction port of the suction nozzle from the downstream side of the feed direction of the wire electrode of the winding device, which is the initial position, through the pair of rollers to a position connected to the outlet of the wire electrode of the first connecting path.

7. The wire electrical discharge machining apparatus according to claim 1, wherein... The wire electrical discharge machining apparatus includes a control device. The conveying device includes a gas-liquid mixing port, which is located upstream of the wire electrode in the feed direction of the conduit, to introduce gas into the wire electrical discharge machining apparatus. The control device drives the suction device to mix the gas flowing in from the gas-liquid mixing port with the processing liquid to generate a gas-liquid mixed fluid. The gas-liquid mixed fluid, which passes through the first connecting path and the second connecting path and is delivered along with the front end of the wire electrode, is then drawn from the inlet of the wire electrode in the first connecting path. Finally, the gas-liquid mixed fluid is discharged from the first discharge path.

8. The wire electrical discharge machining apparatus according to claim 1, wherein the wire electrical discharge machining apparatus includes a control device. The pair of rollers are positioned at the outlet of the wire electrode in the first connecting path, centered on the movement path of the wire electrode. The wire electrical discharge machining apparatus includes a second cylinder assembly, which is connected to the pair of rollers. The control device drives the second cylinder device to open and close the pair of rollers relative to each other with the moving path of the wire electrode as the center, clamping the wire electrode discharged from the outlet of the wire electrode in the first connecting path.

9. The wire electrical discharge machining apparatus according to claim 1, wherein the at least one steering pulley changes the travel direction of the wire electrode from a vertical direction to an obliquely upward direction, and the conduit extends to the outside of the machining groove and is inclined.

10. The wire electrical discharge machining apparatus according to claim 1, wherein the conveying device includes a blower that forms an air layer between the wire electrode and the pair of rollers.

11. The wire electrical discharge machining apparatus according to claim 10, wherein the blower has a through hole through which the suction nozzle passes.

12. The wire electrical discharge machining apparatus according to claim 3, wherein the wire electrical discharge machining apparatus includes a control device. The control device switches the connection between the first discharge device and the suction device, and the connection between the second discharge device and the suction device, based on the diameter value of the wire electrode.

13. The wire electrical discharge machining apparatus according to claim 1, wherein the wire electrical discharge machining apparatus includes a control device. The conveying device includes: The first cylinder assembly is connected to the suction nozzle; as well as A gas-liquid mixing port is located upstream of the wire electrode in the feed direction of the conduit, introducing gas into the wire electrical discharge machining apparatus. The control device drives the first cylinder assembly, causing the suction nozzle's suction port to reciprocate downstream of the wire electrode of the winding device (which is in its initial position) through the pair of rollers to a position connected to the outlet of the wire electrode in the first communication path. The control device drives the suction device to mix the gas flowing in from the gas-liquid mixing port with the processing liquid to generate a gas-liquid mixed fluid. The gas-liquid mixed fluid, which passes through the first connecting path and the second connecting path and is delivered along with the front end of the wire electrode, is then drawn from the inlet of the wire electrode in the first connecting path. Finally, the gas-liquid mixed fluid is discharged from the first discharge path.

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