Automatic electrode wire threading upper wire guide device, method, and wire EDM system

Abstract

This invention relates to an automatic electrode wire threading upper guide device, method, and wire EDM system. The upper guide device includes a support, a first sensor, a second sensor, a guide tube, a first drive unit, and a hydraulic wire conveying unit. The support has a first wire feeding clearance hole and a bending space. The first sensor detects the starting position of the electrode wire, and the second sensor detects the curvature of the electrode wire. In the disengaged position, one end of the guide tube is located within the first wire feeding clearance hole and is disengaged from the bending space. The first drive unit is connected to the guide tube to move the guide tube between the disengaged position and the wire feeding position. The hydraulic wire conveying unit includes a water spray plate and a guide nozzle. The water spray plate is located downstream of the bending space, and the combination of the water spray plate and the guide nozzle forms a channel for wire threading and water spraying. The upper guide device of this invention can realize automatic electrode wire threading, has a simple structure, and is easy to maintain.

Description

Technical Field

[0001] This invention relates to the field of special processing technology, specifically to an automatic electrode wire threading upper guide device, method, and wire electrical discharge machining system. Background Technology

[0002] Wire EDM machines are specialized machining tools that use continuously moving thin metal wires as electrodes to remove metal through pulsed spark discharge. Before operation, wire threading is required, allowing the electrode wire to move from the upper head to the lower head. However, since the area between the upper and lower heads is the machining zone—the area where the workpiece is placed—the wire threading between the upper and lower heads is essentially unguided. Without a guide channel, unguided threading is prone to failure. In related technologies, a thin tube descends from the upper head and rests on the lower head to guide the wire threading; however, this structure is overly complex (mostly using gear and rack structures or cylinder-driven mechanisms), difficult to install, and inconvenient for maintenance. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose an automatic electrode wire threading upper guide device.

[0005] An embodiment of the present invention proposes a method for automatically threading the upper guide wire of the electrode wire.

[0006] The embodiments of the present invention provide an electrical discharge wire cutting system.

[0007] An embodiment of the present invention provides an automatic electrode wire threading upper guide device, comprising a bracket, a first sensor, a second sensor, a guide tube, a first driving component, and a hydraulic wire feeding component. The bracket is provided with a first wire feeding clearance hole and a bending space. Both the first and second sensors are mounted on the bracket, with their detection ends facing the bending space. The first sensor detects the starting position of the electrode wire, and the second sensor detects the curvature of the electrode wire. The guide tube is movably mounted on the bracket and has a wire feeding position and a disengagement position. In the disengagement position, one end of the guide tube is located within the first wire feeding clearance hole and is disengaged from the bending space. The curved space; the first driving member is mounted on the bracket and connected to the wire guide tube to drive the wire guide tube to move between the disengaged position and the wire feeding position; the hydraulic wire feeding component includes a water spray plate and a wire guide nozzle, the water spray plate is mounted on the bracket and located downstream of the curved space, the water spray plate has a first water hole and a first wire guide hole, the inlet of the first water hole is used to connect to the pumping system, the wire guide nozzle has a second water hole and a second wire guide hole, the wire guide nozzle is mounted on the water spray plate, the outlet of the first water hole is connected to the second water hole, the first wire guide hole is connected to the second wire guide hole, and the second wire guide hole is used to face the lower head of the EDM wire cutting system.

[0008] The automatic electrode wire threading upper guide device of this invention uses water flow to guide the electrode wire threading. Its structure is simple, requires minimal modification to existing cutting systems, and during electrode wire operation, the hydraulic wire conveying component can spray water downwards to cool and lubricate the workpiece. Furthermore, the automatic electrode wire threading upper guide device of this invention includes a bending space. A first sensor determines the starting position of the threading, and a second sensor determines whether the electrode wire is bent, thereby determining whether the electrode wire needs to be retracted, advanced, or manually adjusted.

[0009] In some embodiments, the automatic electrode wire threading upper guide device further includes a wire feeding assembly located upstream of the guide tube, the wire feeding assembly comprising:

[0010] A first drive motor and a first pressure roller, wherein the first drive motor is mounted on the bracket and has a drive shaft, and the first pressure roller is mounted on the drive shaft;

[0011] A sliding frame and a first telescopic member, the sliding frame being movably mounted on the bracket and having a clamping position and an open position, the movable end of the first telescopic member being connected to the sliding frame to drive the sliding frame to move between the clamping position and the open position;

[0012] A driven shaft and a second pressure roller are provided. The driven shaft is rotatably mounted on the sliding frame, and the second pressure roller is mounted on the driven shaft. In the clamping position, the driven shaft and the driving shaft are connected and drive the second pressure roller and the first pressure roller to form a wire clamping channel to clamp the electrode wire. The wire clamping channel is opposite to the wire guide tube. In the open position, at least one of the first pressure roller and the second pressure roller is spaced apart from the electrode wire.

[0013] In some embodiments, the wire feeding assembly further includes an elastic element and a connecting pin, the connecting pin being movably disposed within the slide frame, the connecting pin connecting to the first telescopic element, and the elastic element connecting the slide frame and the connecting pin to generate a force on the slide frame toward the driven shaft.

[0014] In some embodiments, the wire feeding assembly further comprises a wire guide housing, a first guide member, and a second guide member. The wire guide housing is disposed on the bracket, the first guide member is disposed on the wire guide housing, and the second guide member is disposed on the bracket. The first guide member has a first guide channel, and the second guide member has a second guide channel. The first guide member and the second guide member are respectively located upstream and downstream of the wire clamping channel. The first guide channel, the wire clamping channel, the second guide channel, and the wire guide tube are sequentially connected.

[0015] In some embodiments, the guide wire tube is a telescopic tube, which includes a fixed section and a movable section. The fixed section is disposed on the bracket, the first driving member is a second telescopic member, the second telescopic member is connected to the movable section, and the end of the movable section opposite to the fixed section forms one end of the guide wire tube.

[0016] In some embodiments, the first sensor and the second sensor are arranged along the wire threading direction of the electrode wire, the moving segment has a mating part that mates with the first wire feeding clearance hole, and the outer wall surface of the mating part is provided with a notch or groove facing the first sensor and the second sensor to reduce the distance between the electrode wire located in the bending space and the first sensor and the second sensor.

[0017] In some embodiments, the hydraulic wire feeding component further includes an adapter and a nozzle. One end of the adapter is connected to the spray plate, and the inner side of the other end of the adapter is connected to the wire guide nozzle, and the outer side is connected to the nozzle. The adapter is provided with a third wire guide hole and a third water hole. The third wire guide hole communicates with the first wire guide hole and the second wire guide hole. The nozzle is provided with a confluence groove, and the nozzle outlet is located in the confluence groove. The third water hole communicates with the first water hole and the second water hole. The second water hole and the second wire guide hole are both communicated with the confluence groove.

[0018] In some embodiments, the automatic electrode wire threading upper guide device further includes a pretreatment device, the pretreatment device comprising:

[0019] A first conductive element, a second conductive element, and a third conductive element are provided, the first conductive element, the third conductive element, and the second conductive element being spaced apart in a first direction, and the first conductive element, the third conductive element, and the second conductive element are all used to abut against the electrode wire;

[0020] A first pressure block, rotatably mounted on the bracket and having an overlapping position and a first disengaged position, wherein in the overlapping position, the first pressure block overlaps the first conductive element to increase the resistance to movement of the electrode wire, and in the first disengaged position, the first pressure block is spaced apart from the first conductive element; and,

[0021] The second pressure block is rotatably disposed on the bracket and has a fixed position and a disengaged position. In the fixed position, the second pressure block abuts against the second conductive element to fix the electrode wire. In the disengaged position, the second pressure block is spaced apart from the second conductive element.

[0022] The automatic electrode wire threading upper guide wire method of this invention uses the aforementioned upper guide wire device and includes the following steps:

[0023] Step A, determine the starting position of automatic threading: thread the electrode wire into the guide tube, move the end of the electrode wire below the detection position corresponding to the first sensor, move the electrode wire upward until the detection signal of the first sensor disappears and stop moving, mark this as the starting position of automatic threading;

[0024] Step B: Guide the electrode wire to the outlet of the guide wire nozzle: After determining the starting position, the first driving member drives the guide wire tube to move from the disengagement position to the wire feeding position, and moves the end of the electrode wire from the starting position through the guide wire tube and the first guide wire hole to the guide wire nozzle. Then, the first driving member drives the guide wire tube to move from the wire feeding position to the disengagement position, so that the electrode wire is exposed in the bending space.

[0025] Step C: Water flow guided automatic wire threading: Pump water into the first water hole, the water enters the first guide wire hole from the first water hole, and finally sprays out from the outlet of the guide wire nozzle. The sprayed water flow drives the electrode wire to move towards the lower machine head for wire threading.

[0026] Step D: Threading Bending Degree Detection: In step C, the second sensor detects whether the electrode wire is bent. If the electrode wire is detected to be bent, it is moved back and threading is attempted again. If the detection result of the second sensor is negative, normal threading is performed. If the detection result of the electrode wire is positive, the wire is moved back and threading is attempted again. If the number of attempts exceeds the preset number, a threading failure alarm is triggered, and manual processing is required.

[0027] The wire electrical discharge machining system of this invention includes the aforementioned upper wire guide device. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the upper guide wire device for automatic electrode wire threading according to an embodiment of the present invention.

[0029] Figure 2 This is one of the structural schematic diagrams of the upper guide wire device according to an embodiment of the present invention;

[0030] Figure 3 This is one of the structural schematic diagrams of the wire feeding assembly according to an embodiment of the present invention;

[0031] Figure 4 This is a second schematic diagram of the wire feeding assembly according to an embodiment of the present invention;

[0032] Figure 5 This is the third schematic diagram of the wire feeding assembly according to an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the guide wire tube and the first driving component according to an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of the hydraulic wire conveying component according to an embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of the pretreatment device according to an embodiment of the present invention, wherein the electrode wire is in a state after being straightened and before being cut;

[0036] Figure 9 This is a schematic diagram of the structure of the first adjusting turntable, the first conductive element, and the first pressure block of the present invention;

[0037] Figure 10 This is a schematic diagram of the structure of the second adjusting turntable, the second conductive element, the third conductive element, and the second pressure block of the present invention;

[0038] Figure 11 This is a flowchart illustrating the principle of wire bending detection in step D.

[0039] Figure 12 This is a schematic diagram of water flow guiding the threading process according to an embodiment of the present invention.

[0040] Figure label:

[0041] 1000. Wire EDM system;

[0042] 100. Upper guide wire device,

[0043] 1. Bracket; 11. Mounting plate; 111. First plate; 112. Second plate; 12. Mounting block; 121. First mounting part; 1211. First wire feeding clearance hole; 122. Second mounting part; 123. Third mounting part; 1231. Second wire feeding clearance hole.

[0044] 2. First sensor;

[0045] 3. Second sensor;

[0046] 4. Guide wire tube; 41. Fixed section; 411. Transition flange; 42. Moving section; 421. Mating part; 4211. Notch groove;

[0047] 5. First driving component;

[0048] 6. Hydraulic wire conveying component; 61. Water spray plate; 611. First water hole; 612. First wire guide hole; 62. Wire guide nozzle; 621. Second water hole; 622. Second wire guide hole; 63. Adapter; 631. Third wire guide hole; 632. Third water hole; 64. Nozzle; 641. Manifold.

[0049] 7. Wire feeding assembly; 71. First drive motor; 72. First pressure roller; 721. Clearance notch; 73. Sliding frame; 74. First telescopic component; 75. Driven shaft; 76. Second pressure roller; 77. Wire clamping channel.

[0050] 78. Elastic element; 79. Connecting pin; 710. Guide wire housing; 711. First guide element; 7111. First guide channel; 7112. First thread nozzle; 71121. First thread hole; 7113. First guide plug; 71131. First guide hole; 712. Second guide element; 7121. Second guide channel; 7122. Second guide plug; 71221. Second guide hole; 7123. Connecting tube; 713. Driving gear; 714. Driven gear;

[0051] 8. Pre-treatment equipment;

[0052] 81. First conductive component; 811. First conductive block; 82. Second conductive component; 821. Second conductive block; 83. Third conductive component; 831. Third conductive block; 84. Pretreatment plate; 85. First pressing block; 851. First arc segment; 852. First straight segment; 853. Second arc segment; 86. Second pressing block; 861. Third arc segment; 862. Second straight segment; 863. Fourth arc segment; 87. First adjusting turntable; 871. First fastener; 872. First arc groove; 88. Second adjusting turntable; 881. Second fastener; 882. Second arc groove; 891. First guide wheel; 892. Second guide wheel.

[0053] 001. Electrode wire;

[0054] 200, wire storage cylinder; 300, guide wheel assembly; 500, lower wire guide assembly. Detailed Implementation

[0055] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0056] The following is a reference to the appendix. Figures 1 to 12 The present invention provides a detailed description of the automatic electrode wire threading upper guide device, method, and wire electrical discharge cutting system according to embodiments of the present invention.

[0057] The automatic electrode wire threading upper guide device 100 of this invention is installed on the wire electrical discharge machining system 1000, replacing the upper head portion of the system. It cooperates with the lower head to thread the electrode wire into the lower head. The automatic electrode wire threading upper guide device 100 of this invention can be used not only during the electrode wire threading stage but also during the electrode wire's operation, thus requiring minimal modification to the existing cutting system and not affecting the normal use of other parts of the cutting system 1000.

[0058] like Figure 1 As shown, the wire electrical discharge machining (EDM) system 1000 of this embodiment includes an automatic wire threading upper guide device 100, a wire storage drum 200, a guide wheel assembly 300, and a lower guide wire assembly 500. The electrode wire 001 is wound and stored on the wire storage drum 200. During threading, the head end of the electrode wire 001 passes through and is positioned sequentially in the guide wheel assembly 300, the upper guide device 100, and the lower guide wire assembly 500. The workpiece to be cut is located between the upper guide device 100 and the lower guide wire assembly 500. The guide wheel assembly 300 includes a tensioning component (not shown in the figure), which can adjust the tension of the electrode wire 001.

[0059] like Figure 2As shown, the automatic electrode wire threading upper guide device 100 of this embodiment includes a bracket 1, a first sensor 2, a second sensor 3, a guide tube 4, a first driving component 5, and a hydraulic wire conveying component 6.

[0060] The support 1 has a first wire feeding clearance hole 1211 and a bending space. A first sensor 2 and a second sensor 3 are both mounted on the support 1, with the detection ends of both sensors facing the bending space. The first sensor 2 detects the starting position of the electrode wire, and the second sensor 3 detects the degree of bending of the electrode wire. A guide tube 4 is movably mounted on the support 1 and has a wire feeding position and a disengagement position. In the disengagement position, one end of the guide tube 4 is located within the first wire feeding clearance hole 1211 and is disengaged from the bending space. A first driving member 5 is mounted on the support 1 and connected to the guide tube 4 to move the guide tube 4 between the disengagement position and the wire feeding position. The hydraulic wire feeding component 6 includes a water spray plate 61 and a wire guide nozzle 62. The water spray plate 61 is mounted on the support 1 and is located downstream of the bending space. The water spray plate 61 has a first water hole 611 and a first wire guide hole 612. The inlet of the first water hole 611 is used to connect to the water pumping system. The wire guide nozzle 62 has a second water hole 621 and a second wire guide hole 622. The wire guide nozzle 62 is mounted on the water spray plate 61. The outlet of the first water hole 611 is connected to the second water hole 621. The first wire guide hole 612 is connected to the second wire guide hole 622. The second wire guide hole 622 is used to face the lower head of the wire EDM system 1000.

[0061] The automatic electrode wire threading upper guide wire method of this embodiment of the invention uses an upper guide wire device 100 and includes the following steps:

[0062] Step A, determine the starting position of automatic threading: insert the electrode wire into the guide tube 4, move the end of the electrode wire to below the detection position corresponding to the first sensor 2, move the electrode wire upward until the detection signal of the first sensor 2 disappears and stop moving, mark this as the starting position of automatic threading.

[0063] Step B: Guide the electrode wire to the outlet of the guide wire nozzle 62: After determining the starting position, the first driving member 5 drives the guide wire tube 4 from the disengagement position to the wire feeding position, and drives the wire end of the electrode wire to pass through the guide wire tube 4 and the first guide wire hole 612 from the starting position and move to the guide wire nozzle 62. Then, the first driving member 5 drives the guide wire tube 4 from the wire feeding position to the disengagement position, so that the electrode wire is exposed in the bending space.

[0064] Step C: Water flow guides automatic wire threading: Pump water into the first water hole 611. The water enters the first wire guide hole 612 from the first water hole 611 and finally sprays out from the outlet of the wire guide nozzle 62. The sprayed water flow drives the electrode wire to move downward to the machine head for wire threading.

[0065] Step D: Threading Bending Degree Detection: In step C, the second sensor 3 detects whether the electrode wire is bent. If the electrode wire is detected to be bent, it is moved back and threading is attempted again. If the detection result of the second sensor is negative, normal threading is performed. If the detection result of the electrode wire is positive, the wire is moved back and threading is attempted again. If the number of attempts exceeds the preset number, a threading failure alarm is triggered, and manual processing is required.

[0066] The preset number of attempts is set before threading. It is determined based on actual needs, taking into account both threading efficiency and success rate. For example, the preset number of attempts could be eight, nine, ten, eleven, or twelve. If the preset number of attempts is low, such as two, three, four, or five, alarms may occur more frequently, and threading may be completed after the electrode wire attempts to retract and advance again. Frequent manual intervention will affect threading efficiency. If the preset number of attempts is high, it means the electrode wire tip will be blocked more often. For example, if the preset number of attempts is fifteen, twenty, or twenty-five, the probability of the wire tip bending is higher, and the electrode wire may struggle to complete threading after retracting and advancing again. This results in a lower alarm frequency, making it difficult for personnel to handle the situation promptly, thus affecting the threading success rate.

[0067] The automatic electrode wire threading upper guide method of this invention uses water flow to guide the electrode wire threading. Its structure is simple, requires minimal modification to the existing cutting system 1000, and during electrode wire operation, the hydraulic wire conveying component 6 can spray water downwards to cool and lubricate the workpiece. Furthermore, the automatic electrode wire threading upper guide device 100 of this invention is equipped with a bending space, allowing the first sensor 2 to determine the starting position of the threading, and the second sensor 3 to determine whether the electrode wire is bent, thereby determining whether the electrode wire needs to be retracted, advanced, or manually handled.

[0068] To make the scheme of this application easier to understand, refer to Figures 1 to 10 The orientation shown is described, wherein the extension direction of the guide wire 4 is the same as the up and down direction.

[0069] The automatic electrode wire threading upper guide device 100 of this invention includes a bracket 1, a first sensor 2, a second sensor 3, a guide tube 4, a first driving component 5, a hydraulic wire conveying component 6, a wire conveying assembly 7, and a pretreatment device 8.

[0070] like Figure 2As shown, the bracket 1 includes a mounting plate 11, a mounting block 12, and a pretreatment plate 84. The mounting plate 11 is an L-shaped frame and includes a first plate 111 and a second plate 112. The first plate 111 is used to mount onto the main body of the wire EDM system 1000. The second plate 112 is located at the upper end of the first plate 111, and a wire feeding assembly 7 is located on the upper side of the second plate 112. The mounting block 12 is located at the lower end of the first plate 111. The pretreatment plate 84 is located on the upper side of the mounting plate 11.

[0071] Mounting block 12 includes a first mounting portion 121, a second mounting portion 122, and a third mounting portion 123, which are sequentially connected and define a bending space. The first mounting portion 121 has a first wire feeding clearance hole 1211. The second mounting portion 122 has a first sensor 2 and a second sensor 3, with the first sensor 2 located above the second sensor 3. The third mounting portion 123 has a second wire feeding clearance hole 1231.

[0072] like Figures 8 to 9 As shown, the pretreatment device 8 of this embodiment includes a first conductive element 81, a second conductive element 82, a third conductive element 83, a first pressing block 85, and a second pressing block 86 disposed on a pretreatment plate 84. The first conductive element 81, the third conductive element 83, and the second conductive element 82 are spaced apart in a first direction (vertical direction), and all three are used to abut against the electrode wire 001. Therefore, when the first conductive element 81 is energized, it becomes electrically connected to the electrode wire 001. When the second conductive element 82 is energized, it becomes electrically connected to the electrode wire 001. When the third conductive element 83 is energized, it becomes electrically connected to the electrode wire 001.

[0073] A first pressure block 85 is rotatably disposed on a pretreatment plate 84 and has an overlapping position and a first disengaged position. The electrode wire 001 passes through the first conductive member 81 and the first pressure block 85. In the overlapping position, the first pressure block 85 overlaps the first conductive member 81 to increase the movement resistance of the electrode wire 001. In the first disengaged position, the first pressure block 85 is spaced apart from the first conductive member 81. A second pressure block 86 is rotatably disposed on the pretreatment plate 84 and has a fixed position and a second disengaged position. The electrode wire 001 passes through the second conductive member 82 and the second pressure block 86. In the fixed position, the second pressure block 86 abuts against the second conductive member 82 to fix the electrode wire 001. In the second disengaged position, the second pressure block 86 is spaced apart from the second conductive member 82.

[0074] See Figure 8 ,by Figure 8The orientation shown is the same as the up and down direction. For ease of description, points A, A', B, and C are defined as the front section of the electrode wire 001. Points A and A' are the positions where the front section of the electrode wire 001 is clamped between the first conductive member 81 and the first pressure block 85 before it is straightened. Point A' is the position where the front section of the electrode wire 001 is clamped between the first conductive member 81 and the first pressure block 85 after it is straightened. Point B is clamped between the second pressure block 86 and the second conductive member 82. Point C is the position where the electrode wire 001 abuts against the third conductive member 83 after it is straightened. It should be noted that, since the length of electrode wire 001 between the first conductive element 81 and the first pressure block 85 is relatively short, the length of electrode wire 001 between the second conductive element 82 and the second pressure block 86 is relatively short, and the contact length between electrode wire 001 and the third conductive element 83 is relatively short, A, A', B, and C are referred to as "points". However, this is not used to limit the point contact between the first conductive element 81 and electrode wire 001, the first pressure block 85 and electrode wire 001, the second conductive element 82 and electrode wire 001, the second pressure block 86 and electrode wire 001, and the third conductive element 83 and electrode wire 001.

[0075] In the pretreatment device 8 of this embodiment of the invention, the second pressing block 86 located at the fixed position abuts against the second conductive member 82 to fix point B of the electrode wire 001, forming a fixed point at the lower end of the front section of the electrode wire 001 to prevent point B of the electrode wire 001 from moving during pretreatment. At this overlap position, the first pressure block 85 overlaps the first conductive element 81 by its own weight, increasing the resistance to movement of point A of the electrode wire 001. As a result, after the electrode wire 001 is installed in the pretreatment equipment 8, the position of point A will not move if the tension remains unchanged. The squeezing force between the first pressure block 85 and the first conductive element 81 on point A of the electrode wire 001 (in other words, the resistance experienced by the electrode wire 001 at point A) is greater than or equal to the tension of the electrode wire 001. When the tension or pulling force is increased upstream of the front section of the electrode wire 001 (that is, upstream of point A), so that the tension (or pulling force) experienced by the electrode wire 001 exceeds the squeezing force between the first pressure block 85 and the first conductive element 81, it can drive point A of the electrode wire 001 to move upstream.

[0076] Regarding the automatic wire threading and upper guide wire method for electrode wires according to embodiments of the present invention, before performing step A, step E is performed to pre-process the electrode wire 001. The pre-processing includes the following steps:

[0077] Step E1, wiring: Lay out the front section of the electrode wire 001 to be threaded, so that the front section of the electrode wire 001 passes between the first conductive member 81 and the first pressure block 85, and between the second conductive member 82 and the second pressure block 86. Then rotate the first pressure block 85 so that the first pressure block 85 moves from the first disengagement position to the overlapping position. Rotate the second pressure block 86 so that the second pressure block 86 moves from the second disengagement position to the fixed position.

[0078] Step E2, Straightening: Simultaneously energize the first conductive element 81 and the second conductive element 82, heating the electrode wire 001 between the first conductive element 81 and the second conductive element 82 until it is red-hot, that is, the AB segment of the electrode wire 001 is red-hot. At the same time, apply tension to the portion of the electrode wire 001 upstream of the first conductive element 81, causing the electrode wire 001 adjacent to the first conductive element 81 to move upstream (that is, causing point A to move upstream), thus straightening the electrode wire 001 located between the first conductive element 81 and the second conductive element 82. After straightening, disconnect the energizer of the first conductive element 81 and remove the tension applied to the electrode wire 001. After straightening, point A', which was originally located below point A, moves to between the first conductive element 81 and the first pressure block 85. After the tension applied to the electrode wire 001 is removed, the straightened electrode wire 001 will not move due to the blocking effect of the squeezing force between the first pressure block 85 and the first conductive element 81. That is, the straightened electrode wire 001 will not move upstream, and the upstream electrode wire 001 will not move between the first conductive element 81 and the first pressure block 85.

[0079] Step E3, Cutting: The third conductive element 83 is energized, heating the electrode wire 001 located between the third conductive element 83 and the second conductive element 82 until it burns out (that is, the electrode wire 001 between points B and C is burned out). After burning out, the end of the electrode wire 001 adjacent to the third conductive element 83 forms a pointed tip. After burning out at point C, due to the blocking effect of the compressive force between the first pressure block 85 and the first conductive element 81 on the electrode wire 001, the straightened electrode wire 001 will not move upstream. The electrode wire from point B to below the second conductive element 82 after burning out becomes waste.

[0080] After the electrode wire 001 is straightened and forms a pointed tip, that is, after the pre-processing of threading the electrode wire 001 is completed, the first pressing block 85 is moved to the first disengagement position, and the second pressing block 86 is moved to the second disengagement position. During the threading and operation of the electrode wire 001, the first pressing block 85 is located at the first disengagement position, and the second pressing block 86 is located at the second disengagement position. Both the first pressing block 85 and the second pressing block 86 are spaced apart from the electrode wire 001, so as not to affect the movement and operation of the electrode wire 001.

[0081] The pretreatment device 8 of this invention uses three conductive elements (first conductive element 81, second conductive element 82 and third conductive element 83) spaced apart in the first direction. By controlling the order in which they are energized, the device heats and burns off the front section of the electrode wire 001. During the heating stage, the tension of the electrode wire 001 is increased to straighten it. After burning off, a needle-like wire end is formed. The extrusion force between the first pressure block 85 and the first conductive element 81 prevents the straightened electrode wire 001 from moving, thus ensuring that the straightened electrode wire 001 will not bend back into the guide wheel assembly. This ensures the straightening effect on the front section of the electrode wire 001, making it easier to thread the wire end of the electrode wire 001.

[0082] The pretreatment device 8 of this invention can straighten the front section of the electrode wire 001 to form a straight section CA' and a pointed wire end, thus realizing the pretreatment of the electrode wire 001 before threading. At the same time, it has a simple structure and low cost. The movement process of the first pressure block 85 and the second pressure block 86 is simple, and the power control operation of the three conductive parts is convenient. This helps to reduce the cost, time and difficulty of threading the electrode wire 001, improve the threading efficiency, and replace the traditional manual straightening of the electrode wire and sanding operation.

[0083] The pretreatment device 8 of this invention is particularly suitable for cutting schemes that use molybdenum wire as electrode wire, solving the problems of difficulty in manually straightening and easy formation of burrs due to the characteristics of molybdenum wire being very thin (0.18 mm in diameter) and having poor flexibility (difficult to recover from bending deformation).

[0084] In some embodiments, the distance between the second conductive element 82 and the third conductive element 83 in the first direction is less than the distance between the third conductive element 83 and the first conductive element 81 in the first direction. Therefore, the burn-off time is shorter than the red-hot stage, and after burn-off, the remaining straight section of electrode wire 001 is longer, meaning the electrode wire 001 used for threading is longer, which improves the ease of threading the electrode wire 001.

[0085] In some embodiments, such as Figure 8 and Figure 9As shown, the pretreatment device 8 further includes a first adjusting turntable 87 and a first fastener 871. The first adjusting turntable 87 is rotatably mounted on the pretreatment plate 84. A first conductive element 81 and a first pressure block 85 are both mounted on the first adjusting turntable 87. The first adjusting turntable 87 has a first arc-shaped groove 872, which is coaxial with the first adjusting turntable 87. The first fastener 871 passes through the first arc-shaped groove 872 and connects to the pretreatment plate 84 to fix the first adjusting turntable 87. By rotating the first adjusting turntable 87, the position of the first conductive element 81 can be adjusted to ensure close contact between the first conductive element 81 and the electrode wire 001, ensuring reliable electrical connection between the first conductive element 81 and the electrode wire 001. After position adjustment, the first adjusting turntable and the pretreatment plate 84 are fastened using the first fastener 871.

[0086] Specifically, the first fastener 871 is the first bolt. The pretreatment plate 84 is provided with a first threaded hole, which is opposite to the first arc groove 872. When it is necessary to fix the first adjusting turntable 87, the first bolt is passed through the first arc groove 872 and installed into the first threaded hole. The first bolt is tightened to fix the first adjusting turntable 87.

[0087] In some embodiments, such as Figure 9 As shown, the first pressing block 85 is elongated and includes a first arc-shaped segment 851, a first straight segment 852, and a second arc-shaped segment 853. The first arc-shaped segment 851, the first straight segment 852, and the second arc-shaped segment 853 are connected sequentially. The rotation axis of the first pressing block 85 is located on the second arc-shaped segment 853 or on the side of the first straight segment 852 adjacent to the second arc-shaped segment 853. At this overlapping position, the first arc-shaped segment 851 overlaps the second conductive element 82. The first arc-shaped segment 851 abuts against the first conductive element 81. The end faces of both ends of the first pressing block 85 (the first arc-shaped segment 851 and the second arc-shaped segment 853) are arc-shaped and without sharp edges, so that there will be no jamming when rotating and abutting against the first pressing block 85. This facilitates the movement of the first pressing block 85 between the overlapping position and the first disengaged position, and at the same time, it will not scratch the electrode wire 001 and the first conductive element 81.

[0088] Specifically, the first arc segment 851 is a semicircular arc, and the second arc segment 853 is a semicircular arc.

[0089] In some embodiments, the first pressing block 85 in the first disengaged position is in a naturally hanging state, that is, the first arc-shaped segment 851 is located at the lower end of the first pressing block 85. In other embodiments, a first limiting block (not shown in the figure) is provided on the first adjusting turntable 87. The first limiting block is located on the right side of the first pressing block 85. In the first disengaged position, the first arc-shaped segment 851 of the first pressing block 85 overlaps the first limiting block, and the first pressing block 85 remains stable by its own weight.

[0090] In some embodiments, the pretreatment device 8 further includes a second adjusting turntable 88 and a second fastener 881. The second adjusting turntable 88 is rotatably mounted on the pretreatment plate 84. A second conductive element 82, a third conductive element 83, and a second pressure block 86 are all mounted on the second adjusting turntable 88. The second adjusting turntable 88 has a second arc-shaped groove 882, which is coaxial with the second adjusting turntable 88. The second fastener 881 passes through the second arc-shaped groove 882 and connects to the pretreatment plate 84 to fix the second adjusting turntable 88. The second conductive element 82 and the third conductive element 83 are located on both sides of the electrode wire 001. Figure 8 and Figure 10 As shown, rotating the second adjusting turntable 88 counterclockwise brings the second conductive element 82 and the third conductive element 83 closer together in the left-right direction, ensuring that both the second conductive element 82 and the third conductive element 83 are in close contact with the electrode wire 001, ensuring the reliability of the electrical connection between the second conductive element 82 and the electrode wire 001, and ensuring the reliability of the electrical connection between the third conductive element 83 and the electrode wire 001.

[0091] Specifically, the second fastener 881 is the second bolt, which is installed onto the pretreatment plate 84 by passing through the second arc-shaped groove 882 and tightening it to fix the second adjusting turntable 88.

[0092] In some embodiments, such as Figure 10 As shown, the second pressing block 86 is elongated and includes a third arc-shaped segment 861, a second straight segment 862, and a fourth arc-shaped segment 863. The third arc-shaped segment 861, the second straight segment 862, and the fourth arc-shaped segment 863 are connected sequentially. The third arc-shaped segment 861 is a semi-circular arc. The rotation axis of the second pressing block 86 is located on the side of the second straight segment 862 adjacent to the third arc-shaped segment 861. In this fixed position, the third arc-shaped segment 861 abuts against the second conductive element 82. The end faces of the two ends of the second pressing block 86 (the third arc-shaped segment 861 and the fourth arc-shaped segment 863) are arc-shaped and without sharp edges, so that it will not get stuck when rotating and abutting against the second conductive element 82. This facilitates the movement of the first pressing block 85 between the overlapping position and the first disengaged position, and at the same time, it will not scratch the second conductive element 82.

[0093] The rotation axis of the second pressing block 86 is located on the side of the second straight segment 862 adjacent to the third arc segment 861. Therefore, the rotation axis of the second pressing block 86 is eccentric relative to the center of the third arc segment 861. In this fixed position, increasing the rotation angle of the second pressing block 86 toward the second conductive member 82 can increase the squeezing force between the second pressing block 86 and the second conductive member 82, ensuring that point B of the electrode wire 001 is fixed. Furthermore, the distance between the rotation axis of the second pressing block 86 and the third arc segment 861 is less than the distance between the rotation axis and the fourth arc segment 863. According to the lever principle, by applying external force to the fourth arc segment 863 or in the area adjacent to the fourth arc segment 863 of the second straight segment 862, it is easier to move the third arc segment 861, thereby facilitating the control and adjustment of the contact, squeezing, and separation between the third arc segment 861 and the second conductive member 82.

[0094] Specifically, the fourth arc segment 863 is a semicircular arc.

[0095] In some embodiments, the second pressure block 86 in the second disengaged position is in a naturally hanging state, that is, the third arc-shaped segment 861 is located at the lower end of the second pressure block 86. In other embodiments, a second limiting block (not shown in the figure) is provided on the first adjusting turntable 87. The second limiting block is located on the right side of the second pressure block 86. In the second disengaged position, the third arc-shaped segment 861 of the second pressure block 86 overlaps the second limiting block, and the second pressure block 86 remains stable by its own weight.

[0096] In some embodiments, the first conductive element 81 includes a first conductive block 811. The side of the first conductive block 811 facing the first pressure block 85 is an arc-shaped surface. The arc-shaped surface is a smooth surface, which not only will not scratch the electrode wire 001, but also will prevent the first pressure block 85 from getting stuck during the process of overlapping and separating from the first conductive block, thus facilitating the movement of the first pressure block 85.

[0097] The second conductive element 82 includes a second conductive block 821, the side of the second conductive block 821 facing the second pressure block 86 being an arc-shaped surface. The third conductive element 83 includes a third conductive block 831, the side of the third conductive block 831 used to abut against the electrode wire 001 being an arc-shaped surface.

[0098] In some embodiments, the first conductive element 81 and the second conductive element 82 are located on the same side of the electrode wire 001. Correspondingly, the first pressing block 85 and the second pressing block 86 are located on the same side of the electrode wire 001. Figure 8 As shown, the first conductive element 81 and the second conductive element 82 are both located on the left side of the electrode wire 001, and the first pressure block 85 and the second pressure block 86 are located on the right side of the electrode wire 001. This allows personnel to rotate the first pressure block 85 and the second pressure block 86 sequentially or simultaneously, improving the operational convenience of the pretreatment device 8 in this embodiment of the invention.

[0099] In some embodiments, the pretreatment device 8 further includes a first guide wheel 891, which is rotatably mounted on the pretreatment plate 84. The first guide wheel 891 is located upstream of and adjacent to the first conductive element 81. The first guide wheel 891 guides the electrode wire. By positioning the first guide wheel 891 above the first conductive element 81, the curvature of the electrode wire 001 between the first guide wheel 891 and the first conductive element 81 is reduced. This prevents the first conductive element 81 from bearing the responsibility of guiding and turning the electrode wire 001. During the straightening stage of the electrode wire 001, this avoids increasing the interaction force between the electrode wire 001 and the first conductive element 81, thus preventing any adverse effects on the first conductive element 81.

[0100] The pretreatment device 8 further includes a second guide wheel 892, which is rotatably mounted on the pretreatment plate 84. The second guide wheel 892 is located between and adjacent to the first conductive element 81 and the third conductive element 83. The second guide wheel 892 is used to guide the electrode wire 001.

[0101] like Figure 1 and Figure 2 As shown, the wire feeding assembly 7 is located below the pretreatment device 8 and above the wire guide tube 4. The wire feeding assembly 7 includes a first drive motor 71, a first pressure roller 72, a sliding frame 73, a first telescopic member 74, a driven shaft 75, and a second pressure roller 76.

[0102] A first drive motor 71 is mounted on a bracket 1 and has a drive shaft. A first pressure roller 72 is mounted on the drive shaft. A sliding frame 73 is movably mounted on the bracket 1 and has a clamping position and an open position. The moving end of a first telescopic member 74 is connected to the sliding frame 73 to drive the sliding frame 73 to move between the clamping position and the open position. A driven shaft 75 is rotatably mounted on the sliding frame 73, and a second pressure roller 76 is mounted on the driven shaft 75. In the clamping position, the driven shaft 75 and the drive shaft are connected and drive the second pressure roller 76 and the first pressure roller 72 to form a wire clamping channel 77 to clamp the electrode wire. The wire clamping channel 77 is opposite to the wire guide tube 4. In the open position, at least one of the first pressure roller 72 and the second pressure roller 76 is spaced apart from the electrode wire.

[0103] like Figures 2 to 4As shown, the first telescopic member 74 drives the sliding frame 73 to move between the open position and the clamping position. Under normal conditions (when the wire EDM system 1000 is operating, when the system is stopped), the sliding frame 73 is displaced to the open position, the driven shaft 75 is not connected to the drive shaft, the space between the second pressure roller 76 and the first pressure roller 72 is larger than the wire clamping channel 77, the first pressure roller 72 and the second pressure roller 76 do not clamp the electrode wire, and the first pressure roller 72 and the second pressure roller 76 do not apply external force to the electrode wire. When the upper wire guide device 100 of this embodiment of the invention needs to thread the wire, and needs to drive the electrode wire to move forward and backward, the first telescopic member 74 drives the sliding frame 73 from the open position to the clamping position, so that the gap between the first pressure roller 72 and the second pressure roller 76 is reduced and a wire clamping channel 77 is formed, so that the first pressure roller 72 and the second pressure roller 76 can clamp the electrode wire. Then, by controlling the first drive motor 71 to start, stop and reverse, through the transmission between the drive shaft and the driven shaft 75, the first pressure roller 72 and the second pressure roller 76 are rotated, thereby driving the electrode wire to move forward or backward.

[0104] The wire feeding assembly 7 provides power for the movement of the electrode wire. In step B, after determining the starting position, the first telescopic member 74 actuates, driving the sliding frame 73 from the open position to the clamping position, so that the first pressure roller 72 and the second pressure roller 76 clamp the electrode wire. Then, the first drive motor 71 is activated, thereby driving the electrode wire forward. In step D, when the electrode wire needs to retract, the first drive motor rotates in the opposite direction to drive the electrode wire back. This further improves the automation level of the upper wire guiding device 100 in this embodiment of the invention.

[0105] Specifically, the first drive motor 71 is a stepper motor, and the first telescopic member 74 is a first cylinder. A drive gear 713 is provided on the drive shaft, and a driven gear 714 is provided on the driven shaft 75. When the sliding frame 73 is in the open position, the drive gear 713 and driven gear 714 are not connected. In the clamping position, the drive gear 713 and driven gear 714 mesh, thereby driving the first pressure roller 72 to rotate when the drive shaft rotates. The drive shaft, through the meshing of the drive gear 713 and driven gear 714, drives the second pressure roller 76 to rotate.

[0106] In some embodiments, such as Figure 5As shown, the wire feeding assembly 7 further includes an elastic element 78 and a connecting pin 79. The connecting pin 79 is movably inserted into the sliding frame 73 and connects to the first telescopic element 74. The elastic element 78 connects the sliding frame 73 and the connecting pin 79 to form a force on the sliding frame 73 toward the driven shaft 75. The elastic element 78 has a certain elasticity and deformability. When subjected to compressive force, it can deform and absorb some kinetic energy, thereby providing a certain floating space for the sliding frame 73. When the first drive motor 71 drives the sliding frame 73 to move from the open position to the clamping position, it avoids hard collisions between the driven gear 714 and the drive gear 713, avoids hard collisions between the second pressure roller 76 and the first pressure roller 72, and avoids damage to the first pressure roller 72 and the second pressure roller 76, as well as damage caused by excessive compression of the electrode wire.

[0107] Specifically, such as Figure 5 As shown, the sliding frame 73 has a three-stage hole, including a first hole section, a second hole section, and a third hole section. The diameters of the first hole section, the second hole section, and the third hole section decrease sequentially. The first hole section is located on the side of the three-stage hole facing the driven shaft 75. The connecting pin 79 includes a large-diameter section and a small-diameter section. The large-diameter section is located inside the first hole section and abuts against the bottom wall surface of the first hole section. The small-diameter section passes through the second hole section and the third hole section, connecting to the first telescopic member 74. The elastic member 78 is located in the second hole section. The elastic member 78 connects the bottom wall surface of the second hole section and the large-diameter section to generate a force on the sliding frame 73 toward the first hole section.

[0108] Specifically, the elastic element 78 is a spring. The spring is sleeved on the small-diameter section of the connecting pin 79.

[0109] Specifically, connecting pin 79 is a pin screw.

[0110] In some embodiments, such as Figures 2 to 4 As shown, the wire feeding assembly 7 further includes a wire guide housing 710, a first guide member 711, and a second guide member 712. The wire guide housing 710 is mounted on the bracket 1. The first guide member 711 is mounted on the wire guide housing 710, and the second guide member 712 is mounted on the bracket 1. The first guide member 711 has a first guide channel 7111, and the second guide member 712 has a second guide channel 7121. The first guide member 711 and the second guide member 712 are located upstream and downstream of the wire clamping channel 77, respectively. The first guide channel 7111, the wire clamping channel 77, the second guide channel 7121, and the wire guide tube 4 are connected in sequence.

[0111] The wire guide housing 710 provides a certain degree of protection for the wire conveying assembly 7, preventing impurities and dust from the environment from entering the wire clamping channel 77 and the gear transmission area. It also provides an installation point for the first guide member 711. The first wire guide assembly guides the electrode wire entering the upper wire guide device 100, allowing the electrode wire to smoothly enter the wire clamping channel 77 from the first guide channel 7111. The second guide channel 7121 connects the wire clamping channel 77 and the wire guide tube 4, thereby guiding the movement of the electrode wire from the wire clamping channel 77 into the wire guide tube 4, and thus moving it to the starting position of automatic wire threading.

[0112] Specifically, such as Figure 3 As shown, the first guide member 711 includes a first thread nozzle 7112 and a first guide plug 7113. Both the first thread nozzle 7112 and the first guide plug 7113 are provided on the guide wire housing 710. The first thread nozzle 7112 is located on the upper side of the first guide plug 7113. The first thread nozzle 7112 has a first thread hole 71121 in the middle. The first guide plug 7113 has a first guide hole 71131. The first thread hole 71121 is a tapered hole. The large diameter end of the tapered hole is located on the upper side and the small diameter end is located on the lower side. The small diameter end of the tapered hole abuts against the first guide hole 71131. The first thread hole 71121 and the first guide hole 71131 are connected to form a first guide channel. The second guide member 712 includes a second guide plug 7122 and a connecting tube 7123. The second guide plug 7122 is provided with a second guide hole 71221. The upper end of the second guide hole 71221 is opposite to the wire clamping channel 77. The connecting tube 7123 is provided on the second plate 112 and is nested inside the second guide plug 7122. The upper end of the connecting tube 7123 is connected to the second guide block, and the lower end of the connecting tube 7123 is connected to the wire guide tube 4.

[0113] Furthermore, such as Figure 3 As shown, both the first guide plug 7113 and the second guide plug 7122 have clearance notches 721 near the wire clamping channel 77 (i.e., the lower end of the first guide plug 7113) and the second guide plug 7122 near the wire clamping channel 77 (i.e., the upper end of the second guide plug 7122). The first pressure roller 72 and the second pressure roller 76 also have corresponding clearance notches 721. This reduces the space occupied by the lower end of the first guide plug 7113 and the upper end of the second guide plug 7122, allowing the lower end of the first guide plug 7113 and the upper end of the second guide plug 7122 to be closer to the wire clamping channel 77 (and also closer to the first pressure roller 72 and the second pressure roller 76). This further reduces the space between the lower end of the first guide plug 7113 and the upper end of the second guide plug 7122, reducing the unguided passage distance during wire threading and ensuring that the electrode wire can smoothly enter the second guide channel 7121 from the first guide channel 7111, thus ensuring the smooth progress of the wire threading process.

[0114] like Figure 2and Figure 6 As shown, the guide wire tube 4 is movably mounted on the bracket 1 and has a wire feeding position and a disengagement position. In the disengagement position, one end of the guide wire tube 4 is located within the first wire feeding clearance hole 1211 and is separated from the bending space. In the wire feeding position, this end of the guide wire tube 4 is connected to one end of the first guide wire hole 612. The first driving member 5 is mounted on the bracket 1 and is connected to the guide wire tube 4 to drive the guide wire tube 4 to move between the disengagement position and the wire feeding position.

[0115] The guide wire tube 4 is a telescopic tube, which includes a fixed section 41 and a movable section 42. The fixed section 41 is mounted on the bracket 1, and the fixed point is sleeved on the lower end of the connecting tube 7123 and communicates with the connecting tube 7123. The first driving member 5 is a second telescopic member, which is connected to the movable section 42. The end of the movable section 42 away from the fixed section 41 (that is, the lower end of the movable section 42) forms one end of the guide wire tube 4.

[0116] Specifically, the second telescopic component is a second cylinder, which is mounted on the first plate 111 of the mounting plate 11. The telescopic tube can extend and shorten; when the moving section 42 moves downward, the telescopic tube extends, and when the moving section 42 moves upward, the telescopic tube shortens. The fixed section 41 of the telescopic tube is connected to the transition flange 411, which is fixedly connected to the second plate 112 of the mounting plate 11 of the bracket 1. The moving end of the second cylinder is connected to the moving section 42, thereby driving the moving section 42 of the telescopic tube to move between the disengaged position and the wire feeding position, and simultaneously driving the telescopic tube to extend and shorten.

[0117] Furthermore, the shape of the moving segment 42 matches the contour shape of the first wire feeding clearance hole 1211, and the shape of the moving segment 42 matches the contour shape of the second wire feeding clearance hole 1231. When the first driving member 5 drives the moving segment 42 to move from the disengaged position to the wire feeding position, the lower end of the moving segment 42 passes through the bending space from the first wire feeding clearance hole 1211 into the second wire feeding clearance hole 1231. At the wire feeding position, the lower end of the moving segment 42 abuts against the water spray plate 61 of the hydraulic wire feeding member 6.

[0118] The telescopic characteristics of the guide tube 4 not only achieve the purpose of guiding the electrode wire in the bending space, so that the electrode wire can smoothly enter the hydraulic wire conveying component 6, but also drive the moving section 42 of the guide tube 4 to leave the bending space through the first driving component 5, thereby facilitating the detection of the first sensor 2 and the second sensor 3.

[0119] Specifically, a third guide plug and a guide tube are provided in the second wire feeding clearance hole 1231. When the telescopic tube is in the wire feeding position, the lower end of the moving section 42 is connected to the first wire guide hole 612 of the water spray plate 61 through the third guide plug and the guide tube.

[0120] In some embodiments, such as Figure 6As shown, the first sensor 2 and the second sensor 3 are arranged along the wire threading direction of the electrode wire. The moving section 42 has a mating part 421, which mates with the first wire feeding clearance hole 1211. The outer wall surface of the mating part 421 is provided with a notch 4211, which faces the first sensor 2 and the second sensor 3 to reduce the distance between the electrode wire located in the bending space and the first sensor 2 and the second sensor 3, thereby ensuring that the electrode wire is located within the detection surface of the first sensor 2 and the second sensor 3. Correspondingly, the contours of the first wire feeding clearance hole 1211 and the second wire feeding clearance hole 1231 are the same as the shape of the mating part 421 of the moving section 42.

[0121] Specifically, both the first sensor 2 and the second sensor 3 are fiber optic sensors. The first sensor 2 detects whether there are electrode wires on its detection surface, and the second sensor 3 detects the curvature of the electrode wires within its coverage area.

[0122] Specifically, the second sensor 3 is equipped with an amplifier to adjust the detection sensitivity and trigger threshold.

[0123] Therefore, in the upper guide wire device 100 of the present invention, the detection area of ​​the second sensor 3 is 13mm away from the lower side of the first mounting part 121, and the detection area of ​​the second sensor 3 is 13mm away from the upper side of the third mounting part 123, that is, the height of the bending space is 26mm, and the detection area of ​​the second sensor 3 is located in the middle of the bending space. The trigger threshold for bending detection is set to 4mm.

[0124] When the second sensor 3 detects that the electrode wire is bent, the electrode wire needs to be retracted moderately and then threaded forward again. This process is repeated until the wire passes through the obstruction. The principle flowchart is shown in Figure 11.

[0125] like Figure 7 and Figure 12 As shown, the hydraulic wire feeding component 6 includes a water spray plate 61 and a wire guide nozzle 62. The water spray plate 61 is mounted on the support 1 and is located downstream of the bending space. The water spray plate 61 has a first water hole 611 and a first wire guide hole 612. The inlet of the first water hole 611 is used to connect to the water pumping system. The wire guide nozzle 62 has a second water hole 621 and a second wire guide hole 622. The wire guide nozzle 62 is mounted on the water spray plate 61. The outlet of the first water hole 611 is connected to the second water hole 621. The first wire guide hole 612 is connected to the second wire guide hole 622. The second wire guide hole 622 is used to face the lower head of the wire EDM system 1000.

[0126] The inlet of the first water hole 611 is connected to the water pumping system. The water pumping system feeds water into the first water hole 611. The water enters the second water hole 621 through the first water hole 611 and then sprays out from the second water hole 621. As the water flows downward, it drives the electrode wire to move downward, thereby moving the end of the electrode wire from the outlet of the guide nozzle 62 to the lower head, realizing the empty passage of the electrode wire between the guide nozzle 62 and the lower head.

[0127] Compared with the method in related technologies that uses a thin tube to guide the electrode wire through the lower die head, the upper wire guiding device 100 of this invention uses the hydraulic wire conveying component 6 to form a water flow to guide the wire through the wire, realizing the wire through the blank area between the outlet of the wire guide nozzle 62 and the lower die head. Its structure is simple and easy to install and maintain.

[0128] In addition, after the electrode wire is threaded, in the electrode wire working state, the water pumping system pumps water to the first water hole 611, and the water flows out from the wire guide nozzle 62 for cooling and lubrication of the workpiece during processing.

[0129] Specifically, a water spray plate 61 of a hydraulic wire conveying component 6 is provided on the lower side of the third mounting part 123 of the mounting block 12.

[0130] In some embodiments, the hydraulic wire feeding component 6 further includes an adapter 63 and a nozzle 64. One end of the adapter 63 is connected to the spray plate 61, and the inner side of the other end of the adapter 63 is connected to the wire guide nozzle 62, and the outer side is connected to the nozzle 64. The adapter 63 is provided with a third wire guide hole 631 and a third water hole 632. The third wire guide hole 631 is connected to the first wire guide hole 612 and the second wire guide hole 622. The nozzle 64 is provided with a confluence groove 641, and the outlet of the nozzle 64 is located in the confluence groove 641. The third water hole 632 is connected to the first water hole 611 and the second water hole 621. The second water hole and the second wire guide hole 622 are both connected to the confluence groove 641.

[0131] The adapter 63 connects the nozzle 64 and the water spray plate 61, extending the vertical distance between the nozzle 64 and the water spray plate 61. This prevents the water spray plate 61 from interfering with the top or slope of the workpiece or the clamping fixture when the wire EDM system 1000 is cutting the workpiece. Simultaneously, the water flow and the electrode wire flow from the same outlet (the outlet of the nozzle 64), ensuring contact between the water flow and the electrode wire.

[0132] In some embodiments, the nozzle 64 is detachably connected to the adapter 63, and the outlet cross-sectional profile of the nozzle 64 is tapered or rectangular, wherein the small diameter end of the tapered shape faces the lower head or guide nozzle 62.

[0133] Nozzle 64 is threadedly connected to adapter 63, facilitating the disassembly and installation of nozzle 64. This allows for the selection of nozzles 64 with different outlet shapes to meet jet requirements. When the cross-sectional profile of the nozzle 64 outlet is rectangular, the liquid ejected from nozzle 64 forms a water column. When the cross-sectional profile of the nozzle 64 outlet is conical, the velocity of the water flowing out of nozzle 64 increases when the smaller diameter end of the cone faces the lower nozzle head, and decreases when the smaller diameter end of the cone faces the guide wire nozzle 62. Appropriate nozzles can be selected based on different water jet velocities and jet thicknesses.

[0134] Furthermore, in the upper wire guide device 100 of this embodiment, the wire transport channel formed by the interconnected wire guide holes and channels through which the electrode wire passes, in order to ensure the smoothness of the wire transport channel and prevent "steps" or other obstacles from clogging the electrode wire in the direction of the electrode wire's advance, the interconnected holes or channels follow the principles of "transition from small holes to large holes" and "slope-guided transition".

[0135] Specifically, to avoid threading failure due to floating, the entire thread transport channel is constrained by a fine track. For example, the molybdenum wire diameter is 0.18mm, and the constraint design of the thread transport channel is a track diameter of 0.5mm-2mm.

[0136] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0137] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0138] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0139] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0140] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0141] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An automatic electrode wire threading upper guide device (100), characterized in that, include: The bracket (1) is provided with a first wire feeding clearance hole (1211) and a bending space; The first sensor (2) and the second sensor (3) are both mounted on the bracket (1). The detection end of the first sensor (2) and the detection end of the second sensor (3) are both facing the bending space. The first sensor (2) is used to detect the starting position of the electrode wire, and the second sensor (3) is used to detect the curvature of the electrode wire. The guide tube (4) is movably disposed on the bracket (1) and has a wire feeding position and a disengagement position. In the disengagement position, one end of the guide tube (4) is located in the first wire feeding clearance hole (1211) and is disengaged from the bending space. The first driving member (5) is disposed on the bracket (1) and is connected to the guide tube (4) to drive the guide tube (4) to move between the disengagement position and the wire feeding position; The hydraulic wire feeding component (6) includes a water spray plate (61) and a wire guide nozzle (62). The water spray plate (61) is mounted on the bracket (1) and is located downstream of the curved space. The water spray plate (61) has a first water hole (611) and a first wire guide hole (612). The inlet of the first water hole (611) is used to connect to the water pumping system. The wire guide nozzle (62) has a second water hole (621) and a second wire guide hole (622). The wire guide nozzle (62) is mounted on the water spray plate (61). The outlet of the first water hole (611) is connected to the second water hole (621). The first wire guide hole (612) is connected to the second wire guide hole (622). The second wire guide hole (622) is used to face the lower head of the wire EDM system (1000).

2. The automatic electrode wire threading upper guide device (100) according to claim 1, characterized in that, The device further includes a wire feeding assembly (7) located upstream of the wire guide tube (4), the wire feeding assembly (7) comprising: A first drive motor (71) and a first pressure roller (72), wherein the first drive motor (71) is mounted on the bracket (1), the first drive motor (71) has a drive shaft, and the first pressure roller (72) is mounted on the drive shaft; The sliding frame (73) and the first telescopic member (74) are provided. The sliding frame (73) is movably mounted on the bracket (1) and has a clamping position and an open position. The moving end of the first telescopic member (74) is connected to the sliding frame (73) to drive the sliding frame (73) to move between the clamping position and the open position. A driven shaft (75) and a second pressure roller (76) are provided. The driven shaft (75) is rotatably mounted on the sliding frame (73), and the second pressure roller (76) is mounted on the driven shaft (75). In the clamping position, the driven shaft (75) and the driving shaft are connected and drive the second pressure roller (76) and the first pressure roller (72) to form a wire clamping channel (77) to clamp the electrode wire. The wire clamping channel (77) is opposite to the wire guide tube (4). In the open position, at least one of the first pressure roller (72) and the second pressure roller (76) is spaced apart from the electrode wire.

3. The automatic electrode wire threading upper guide device (100) according to claim 2, characterized in that, The wire feeding assembly (7) further includes an elastic element (78) and a connecting pin (79), the connecting pin (79) being movably inserted into the sliding frame (73), the connecting pin (79) being connected to the first telescopic element (74), and the elastic element (78) connecting the sliding frame (73) and the connecting pin (79) to form a force on the sliding frame (73) toward the driven shaft (75).

4. The automatic electrode wire threading upper guide device (100) according to claim 2, characterized in that, The wire feeding assembly (7) further includes a wire guide housing (710), a first guide (711), and a second guide (712). The wire guide housing (710) is mounted on the bracket (1). The first guide (711) is mounted on the wire guide housing (710), and the second guide (712) is mounted on the bracket (1). The first guide (711) has a first guide channel (7111), and the second guide (712) has a second guide channel (7121). The first guide (711) and the second guide (712) are located upstream and downstream of the wire clamping channel (77), respectively. The first guide channel (7111), the wire clamping channel (77), the second guide channel (7121), and the wire guide tube (4) are connected in sequence.

5. The automatic electrode wire threading upper guide device (100) according to claim 1, characterized in that, The guide wire tube (4) is a telescopic tube, which includes a fixed section (41) and a moving section (42). The fixed section (41) is located on the bracket (1). The first driving member (5) is a second telescopic member. The second telescopic member is connected to the moving section (42). The end of the moving section (42) away from the fixed section (41) forms one end of the guide wire tube (4).

6. The automatic electrode wire threading upper guide device (100) according to claim 5, characterized in that, The first sensor (2) and the second sensor (3) are arranged along the wire threading direction of the electrode wire. The moving section (42) has a mating part (421) that mates with the first wire feeding clearance hole (1211). The outer wall surface of the mating part (421) is provided with a notch (4211) that faces the first sensor (2) and the second sensor (3) to reduce the distance between the electrode wire located in the bending space and the first sensor (2) and the second sensor (3).

7. The automatic electrode wire threading upper guide device (100) according to claim 1, characterized in that, The hydraulic wire feeding component (6) further includes an adapter (63) and a nozzle (64). One end of the adapter (63) is connected to the spray plate (61), and the inner side of the other end of the adapter (63) is connected to the wire guide nozzle (62), and the outer side is connected to the nozzle (64). The adapter (63) is provided with a third wire guide hole (631) and a third water hole (632). The third wire guide hole (631) is connected to the first wire guide hole (612) and the second wire guide hole (622). The nozzle (64) is provided with a confluence groove (641), and the outlet of the nozzle (64) is located in the confluence groove (641). The third water hole (632) is connected to the first water hole (611) and the second water hole (621). The second water hole and the second wire guide hole (622) are both connected to the confluence groove (641).

8. The automatic electrode wire threading upper guide device (100) according to claim 1, characterized in that, The device further includes a pretreatment apparatus (8), which comprises: A first conductive element (81), a second conductive element (82), and a third conductive element (83) are provided at intervals in a first direction. The first conductive element (81), the third conductive element (83), and the second conductive element (82) are all used to abut against the electrode wire. A first pressure block (85) is rotatably mounted on the bracket (1) and has an overlapping position and a first disengaged position. In the overlapping position, the first pressure block (85) overlaps the first conductive element (81) to increase the movement resistance of the electrode wire. In the first disengaged position, the first pressure block (85) is spaced apart from the first conductive element (81). The second pressure block (86) is rotatably disposed on the bracket (1) and has a fixed position and a disengaged position. In the fixed position, the second pressure block (86) abuts against the second conductive member (82) to fix the electrode wire. In the second disengaged position, the second pressure block (86) is spaced apart from the second conductive member (82).

9. A method for automatically threading an electrode wire through an upper guide wire, characterized in that, The use of the upper guide wire device (100) according to any one of claims 1 to 8 includes the following steps: Step A, determine the starting position of automatic threading: insert the electrode wire into the guide tube (4), move the end of the electrode wire to below the detection position corresponding to the first sensor (2), move the electrode wire upward until the detection signal of the first sensor (2) disappears and stop moving, mark this as the starting position of automatic threading; Step B: Guide the electrode wire to the outlet of the guide wire nozzle (62): After determining the starting position, the first driving member (5) drives the guide wire tube (4) from the disengagement position to the wire feeding position, and moves the end of the electrode wire from the starting position through the guide wire tube (4) and the first guide wire hole (612) to the guide wire nozzle (62). Then, the first driving member (5) drives the guide wire tube (4) from the wire feeding position to the disengagement position, so that the electrode wire is exposed in the bending space. Step C: Water flow guided automatic wire threading: Pump water into the first water hole (611), the water enters the first guide wire hole (612) from the first water hole (611), and finally sprays out from the outlet of the guide wire nozzle (62). The sprayed water flow drives the electrode wire to move towards the lower machine head for wire threading. Step D: Wire bending detection: In step C, the second sensor (3) detects whether the electrode wire is bent. If the electrode wire is bent, it is driven to retract and try to thread the wire again. If the detection result of the second sensor is negative, the wire is threaded normally. If the detection result of the electrode wire is positive, the wire is retracted and threaded again. If the number of attempts is greater than the preset number, the wire threading failure alarm is triggered and manual processing is performed.

10. A wire electrical discharge machining (EDM) system (1000), characterized in that, Includes the upper guide wire device (100) as described in any one of claims 1 to 8.

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