Automatic wire threading method and device for reciprocating wire-cut electrical discharge machining

Abstract

The application relates to an automatic threading method and device for reciprocating wire-cut electrical discharge wire cutting. The automatic threading device comprises a pretreatment component, an upper wire guide component, a lower wire guide component and a signal trigger. The pretreatment component is used for straightening and cutting the front section of an electrode wire. The upper wire guide component comprises a first sensor and a water power wire feeding member. The first sensor is used for detecting the starting position of the wire head of the electrode wire. The water power wire feeding member guides the electrode wire to the guide through water flow. The guide pipe assembly has a second wire guide path. In a first position, the axis of the second wire guide path is tangent to the wire storage cylinder. In a second position, the outlet of the second wire guide path is adjacent to or abuts against the wire clamping mechanism on one side of the wire storage cylinder. The signal trigger is located between the outlet of the second wire guide path and the wire clamping mechanism. The automatic threading device realizes the threading of the electrode wire, reduces the operation difficulty, reduces the degree of personnel intervention and improves the threading efficiency.

Description

Technical Field

[0001] This invention relates to the field of special processing technology, specifically to an automatic wire threading method and apparatus for reciprocating wire EDM. Background Technology

[0002] Wire EDM machines are specialized machining tools that use continuously moving fine 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. Traditional wire threading requires two manual operators, resulting in low efficiency and high workload. Related technologies use thin tubes to guide the threading and prevent dry threading; however, this design involves complex structures to allow the tube to move up and down, making maintenance inconvenient, difficult to repair in case of malfunction, and time-consuming, leading to production disruptions. Wire threading results are also unstable and highly susceptible to sensor control effects. 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 wire threading method for reciprocating wire EDM.

[0005] The embodiments of the present invention provide an automatic wire threading device for reciprocating wire electrical discharge machining.

[0006] An embodiment of the present invention provides an automatic wire threading device for reciprocating wire EDM, comprising a support and a pretreatment component, an upper wire guide component, a lower wire guide component, and a signal trigger mounted on the support. The pretreatment component includes a first conductive element, a second conductive element, a third conductive element, and a clamping element. The first, third, and second conductive elements are spaced apart in a first direction, and each of the first, third, and second conductive elements is used to abut against the electrode wire. The clamping element is used to clamp the electrode wire. The upper wire guide component includes a first sensor and a hydraulic wire guiding component. The first sensor is used to detect the starting position of the electrode wire tip and is located between the pretreatment component and the hydraulic wire guiding component. The hydraulic wire guiding component has a water spray path and a first wire guide path, with the outlet of the water spray path adjacent to the upper wire guide path. The guidewire path outlet, the lower guidewire component includes a guide and a catheter assembly, the guide is opposite to the outlet of the first guidewire path, the catheter assembly is movably disposed and has a first position and a second position, the catheter assembly has a second guidewire path, the inlet of the second guidewire path is connected to the guide, in the first position, the angle between the axis of the second guidewire path and a preset axis is less than or equal to a preset value, the preset axis is the tangent line where the inlet of the second guidewire path is located and is tangent to the wire storage cylinder, in the second position, the outlet of the second guidewire path is adjacent to or abuts against a wire clamping mechanism on one side of the wire storage cylinder, the signal trigger is located between the outlet of the second guidewire path and the wire clamping mechanism, in the axial direction of the cylinder body of the wire storage cylinder, the signal trigger is located on the side of the electrode wire away from the wire clamping mechanism.

[0007] The automatic wire threading device of this invention straightens and cuts the front section of the electrode wire using a pre-treatment component, forming a straight section with a pointed tip. The wire is then guided by water flow through a hydraulic wire conveying component, and the lower wire guide component creates a closed-path for wire threading, thus reducing operational difficulty, minimizing human intervention, and improving threading efficiency. After threading, it works in conjunction with a wire storage drum to drive the reciprocating motion of the electrode wire for cutting. Furthermore, through the cooperation of a signal trigger and the wire storage drum, automatic wire release is possible, and the wire can be re-threaded after automatic release. This allows for rapid wire threading when cutting different workpieces, improving cutting efficiency.

[0008] The automatic wire threading method for reciprocating wire EDM in this embodiment of the invention, employing the aforementioned automatic wire threading device for reciprocating wire EDM, includes the following steps:

[0009] Step A, Pre-processing: The first conductive element and the second conductive element are energized to heat the front section of the electrode wire until it is red-hot. At the same time, tension is applied to the electrode wire to straighten the front section of the electrode wire. Then, the first conductive element is turned off and the third conductive element is turned on to burn off the electrode wire between the second conductive element and the third conductive element, and the burn-off point forms a pointed wire end.

[0010] Step B: Determine the starting position of automatic threading: Move the electrode wire with the pointed tip obtained in Step A below the detection position of the first sensor, and then move the electrode wire upward until the detection signal of the first sensor disappears. Mark this position as the starting position of automatic threading.

[0011] Step C: Water flow guided automatic wire threading: Move the electrode wire to the outlet of the first guide wire path, pump water into the water spray path, and the water sprays out from the outlet of the water spray path. The sprayed water flow drives the electrode wire to move towards the guide for wire threading.

[0012] Step D: Guide the electrode wire to the wire storage cylinder: Move the catheter assembly to the second position and guide the electrode wire from the guide into the second guide wire path to the wire clamping mechanism adjacent to or abutting the wire storage cylinder. As the electrode wire continues to advance, the end of the electrode wire enters the wire clamping mechanism, and the wire clamping mechanism clamps the electrode wire to complete the wire threading.

[0013] Step E: When it is necessary to change or re-thread the wire, the wire storage drum first releases the wire. During the release, the wire storage drum moves along the axial direction of its body. After the wire release is completed, the electrode wire is offset to the signal trigger. The signal trigger is triggered by the electrode wire and sends a signal. The wire clamping mechanism on one side of the wire storage drum opens, so that the wire end of the electrode wire is released. Then, the electrode wire is driven back to the starting position, and steps B, C and D are performed to re-thread the wire. Alternatively, after changing the wire, steps A, B, C and D are performed to re-thread the wire.

[0014] The automatic wire threading method of this invention straightens and cuts the front section of the electrode wire through pretreatment, forming a straight section with a pointed tip. Water flow guides the electrode wire to the guide, and a lower wire guide component creates a closed-loop path for wire feeding, thus reducing operational difficulty, minimizing human intervention, and improving threading efficiency. After threading, it works in conjunction with a wire storage spool to drive the reciprocating motion of the electrode wire for cutting. Furthermore, through the cooperation of a signal trigger and the wire storage spool, automatic wire feeding is possible, and the wire can be re-threaded after automatic feeding. This allows for rapid wire threading when cutting different workpieces, improving cutting efficiency. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the structure of an automatic wire threading device for reciprocating wire EDM according to an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the pretreatment component according to an embodiment of the present invention, wherein the electrode wire is in a state after being straightened and before being cut;

[0017] Figure 3 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;

[0018] Figure 4 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;

[0019] Figure 5 This is one of the structural schematic diagrams of the upper guide wire component according to an embodiment of the present invention;

[0020] Figure 6 This is one of the structural schematic diagrams of the wire feeding assembly according to an embodiment of the present invention;

[0021] Figure 7 This is a second schematic diagram of the wire feeding assembly according to an embodiment of the present invention;

[0022] Figure 8 This is the third schematic diagram of the wire feeding assembly according to an embodiment of the present invention;

[0023] Figure 9 This is a schematic diagram of the guide wire tube and the first driving component according to an embodiment of the present invention;

[0024] Figure 10 This is a schematic diagram of the structure of the hydraulic wire conveying component according to an embodiment of the present invention;

[0025] Figure 11 This is a flowchart illustrating the principle of wire bending detection in step B3.

[0026] Figure 12 This is a schematic diagram of water flow guiding the threading process according to an embodiment of the present invention.

[0027] Figure 13 This is one of the structural schematic diagrams of the lower guide wire component for automatic electrode wire threading in an embodiment of the present invention;

[0028] Figure 14 This is a second schematic diagram of the structure of the lower guide wire component for automatic electrode wire threading in an embodiment of the present invention;

[0029] Figure 15 This is a schematic diagram of the wire feeding assembly according to an embodiment of the present invention. In order to facilitate the display of the internal structure, the first protective cover is not shown, and the protective shell is in a transparent state.

[0030] Figure 16This is a schematic diagram of the protective shell according to an embodiment of the present invention;

[0031] Figure 17 This is a schematic diagram of the structure of the first protective cover according to an embodiment of the present invention;

[0032] Figure 18 This is a partial cross-sectional view of the lower guide wire component for automatic electrode wire threading according to an embodiment of the present invention;

[0033] Figure 19 yes Figure 18 A magnified view of a portion of the image;

[0034] Figure 20 This is a schematic diagram of the structure of the other end of the telescopic sleeve according to an embodiment of the present invention;

[0035] Figure 21 This is one of the structural schematic diagrams of the tray according to an embodiment of the present invention;

[0036] Figure 22 This is a second schematic diagram of the structure of the tray according to an embodiment of the present invention;

[0037] Figure 23 This refers to the state where the wire end is held by the wire clamping mechanism after the electrode wire is threaded through.

[0038] Figure label:

[0039] 001. Electrode wire;

[0040] 1000. Automatic yarn threading device; 100. Upper yarn guide component.

[0041] 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; 2. First sensor; 3. Second sensor; 4. Wire guide tube; 41. Fixed section; 411. Transition flange; 42. Moving section; 421. Mating part; 4211. Notch; 5. First driving component; 6. Hydraulic wire conveying component; 61. 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;

[0042] 7. First 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; 78. First elastic component; 79. Connecting pin; 710. Wire guide housing; 711. First guide component; 7111. First guide channel; 7112. First wire nozzle; 71121. First wire hole; 7113. First guide plug; 71131. First guide hole; 712. Second guide component; 7121. Second guide channel; 7122. Second guide plug; 71221. Second guide hole; 7123. Connecting pipe; 713. Drive gear; 714. Driven gear;

[0043] 8. Pre-treatment components; 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. Pre-treatment 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.

[0044] 200. Lower guidewire assembly; 201. Guide; 202. Turning housing; 2021. Guidewire channel; 20211. First port; 20212. Second port; 2031. First guide wheel; 2032. Second guide wheel; 204. Catheter assembly; 2041. Telescopic sleeve; 20411. First guide tube; 20412. Second guide tube; 20413. Third guide tube; 20414. Extension tube; 2042. 2043. Sliding drive component; 2044. Connector; 2045. Guide clamp; 2046. Fourth guide channel; 2047. Air inlet; 2048. Connecting sleeve; 2049. Third guide channel; 2040. Limiting ring; 2040. Air inlet chamber; 2041. Sealing ring; 205. Second wire feeding assembly; 2051. Transfer slider; 20511. First slider; 20512. Connecting block; 20513. Second slider; 2 052. Second driving component; 2053. Third driving component; 20531. Third telescopic component; 205311. First adapter plate; 20532. Fourth telescopic component; 205321. Second adapter plate; 2054. Second drive motor; 2055. Third pressure roller; 2056. Second driven shaft; 2057. Fourth pressure roller; 2058. Second elastic component; 2059. Protective shell; 20591. Guide wire groove; 20510. First protective cover, 205101, clearance passage, 20514, second protective cover; 206, tray, 2061, cable routing passage, 20611, first cable inlet, 20612, second cable inlet, 20613, third cable inlet, 2062, guide channel; 207, support plate; 208, conductive block; 300, signal trigger, 400, wire storage cylinder, 4001, cylinder body, 4002, wire clamping mechanism, 500, guide wheel assembly. Detailed Implementation

[0045] 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.

[0046] The following is a reference to the appendix. Figures 1 to 22 This invention provides a detailed description of an automatic wire threading device and method for reciprocating wire electrical discharge machining (EDM) according to embodiments of the present invention.

[0047] like Figure 1 As shown, the automatic wire threading device 1000 for reciprocating wire EDM in this embodiment of the invention includes a support 1 and a pretreatment component 8, an upper wire guide component 100, a lower wire guide component 200 and a signal trigger 300 disposed on the support 1.

[0048] The pretreatment component 8 includes a first conductive element 81, a second conductive element 82, a third conductive element 83, and a clamping element. The first conductive element 81, the third conductive element 83, and the second conductive element 82 are spaced apart 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, and the clamping element is used to clamp the electrode wire.

[0049] The upper wire guide component includes a first sensor 2 and a hydraulic wire conveying component 6. The first sensor 2 is used to detect the starting position of the electrode wire tip. The first sensor 2 is located between the pretreatment component 8 and the hydraulic wire conveying component 6. The hydraulic wire conveying component 6 is provided with a water spray path and a first wire guide path. The outlet of the water spray path is adjacent to the outlet of the wire guide path.

[0050] The lower guidewire component 200 includes a guide 201 and a catheter assembly 204. The guide 201 is opposite to the outlet of the first guidewire path. The catheter assembly 204 is movably disposed and has a first position and a second position. The catheter assembly 204 has a second guidewire path. The inlet of the second guidewire path is connected to the guide 201. In the first position, the angle between the axis of the second guidewire path and a preset axis is less than or equal to a preset value. The preset axis is the tangent line where the inlet of the second guidewire path is located and is tangent to the wire storage cylinder. In the second position, the outlet of the second guidewire path is adjacent to or abuts against a wire clamping mechanism on one side of the wire storage cylinder.

[0051] The signal trigger 300 is located between the outlet of the second guide wire path and the wire clamping mechanism. In the axial direction of the wire storage cylinder 400, the signal trigger is located on the side of the electrode wire away from the wire clamping mechanism.

[0052] The automatic wire threading method for reciprocating wire EDM in this embodiment of the invention employs an automatic wire threading device and includes the following steps:

[0053] Step A, Pre-treatment: The first and second conductive elements are energized to heat the front section of the electrode wire until it is red-hot. At the same time, tension is applied to the electrode wire to straighten the front section of the electrode wire. Then, the first conductive element is turned off and the third conductive element is turned on to burn off the electrode wire between the second and third conductive elements, and the burn-off point forms a pointed wire end.

[0054] Step B: Determine the starting position of automatic threading: Move the electrode wire with pointed tip obtained in Step A below the detection position of the first sensor, and then move the electrode wire upward until the detection signal of the first sensor disappears. Mark this position as the starting position of automatic threading.

[0055] Step C: Water flow guided automatic wire threading: Move the electrode wire to the outlet of the first guide wire path, pump water into the water spray path, and the water sprays out from the outlet of the water spray path. The sprayed water flow drives the electrode wire to move towards the guide for wire threading.

[0056] Step D: Guide the electrode wire to the wire storage cylinder: Move the catheter assembly to the second position and guide the electrode wire from the guide into the second guide wire path to the wire clamping mechanism adjacent to or abutting the wire storage cylinder. As the electrode wire continues to advance, the end of the electrode wire enters the wire clamping mechanism, and the wire clamping mechanism clamps the electrode wire to complete the wire threading.

[0057] Step E: When it is necessary to change or re-thread the wire, the wire storage drum first releases the wire. During the release, the wire storage drum moves along the axial direction of its body. After the wire release is completed, the wire storage drum continues to move forward, causing the electrode wire to deflect to the signal trigger. The signal trigger is triggered by the electrode wire and sends a signal. The wire clamping mechanism on one side of the wire storage drum opens, causing the wire end of the electrode wire to be released. Then, the electrode wire is driven back to the starting position, and steps B, C, and D are performed to re-thread the wire. Alternatively, after changing the wire, steps A, B, C, and D are performed to re-thread the wire.

[0058] The automatic wire threading device of this invention straightens and cuts the front section of the electrode wire using a pre-treatment component 8, forming a straight section with a pointed tip. The wire is then guided by water flow through a hydraulic wire conveying component 6, and the lower wire guide component 200 provides a closed-loop wire conveying process, thus achieving wire threading. This reduces operational difficulty, minimizes human intervention, and improves threading efficiency. After threading, the device works in conjunction with a wire storage drum to drive the reciprocating motion of the electrode wire for cutting. Furthermore, automatic wire release is possible through the interaction of a signal trigger and the wire storage drum. After automatic wire release, the wire can be re-threaded, enabling rapid threading for different workpieces and improving cutting efficiency.

[0059] The automatic wire threading device of this invention is applied to a cutting system. It can not only realize automatic wire threading, but also cooperate with other components in the cutting system (such as wire storage cylinder 400 and guide wheel assembly 500) to perform cutting operations.

[0060] To make the scheme of this application easier to understand, please refer to the appendix. Figures 1 to 22 Let's take the example where the first direction is the same as the up and down directions.

[0061] The automatic threading device of this invention includes a support 1, a pretreatment component 8, an upper thread guide component 100, a lower thread guide component 200, and a signal trigger 300.

[0062] The bracket 1 includes a mounting plate 11, a pretreatment plate 84, and a support plate 207. The pretreatment component 8 is disposed on the pretreatment plate 84, the upper wire guide component 100 is disposed on the mounting plate 11, and the lower wire guide component 200 is disposed on the support plate 207, so that the pretreatment component 8, the upper wire guide component 100, and the lower wire guide component 200 are relatively independent and can be assembled and installed separately.

[0063] Pre-treatment component 8, etc. Figures 2 to 4As shown, the pretreatment component 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.

[0064] 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.

[0065] See Figure 2 ,by Figure 2 The 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.

[0066] In the pretreatment component 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 member 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 place, 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 member 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 member 81, it can drive point A of the electrode wire 001 to move upstream.

[0067] Regarding the automatic threading method of this invention, step A includes the following steps:

[0068] Step A1, 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.

[0069] Step A2, 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 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.

[0070] Step A3, 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.

[0071] 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.

[0072] The pretreatment component 8 of this embodiment of the invention, by arranging three conductive elements (first conductive element 81, second conductive element 82 and third conductive element 83) at intervals in the first direction, controls the order in which they are energized to achieve the heating and burning off of the front section of the electrode wire 001. At the same time, during the heating stage, the tension of the electrode wire 001 is increased to straighten the electrode wire 001. After burning off, a needle-like wire end is formed. Meanwhile, the extrusion force between the first pressure block 85 and the first conductive element 81 prevents the straightened electrode wire 001 from moving, thereby ensuring that the straightened electrode wire 001 will not bend back into the guide wheel assembly, thus ensuring the straightening effect of the front section of the electrode wire 001, and facilitating the threading of the wire end of the electrode wire 001.

[0073] The pretreatment component 8 of this embodiment 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, the structure is simple and the cost is low. 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 the pretreatment of the electrode wire 001, improve the efficiency of threading, and replace the traditional manual straightening of the electrode wire and sanding operation.

[0074] The pre-processing component 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).

[0075] 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.

[0076] In some embodiments, such as Figure 2 and Figure 3 As shown, the pretreatment component 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.

[0077] 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.

[0078] In some embodiments, such as Figure 3 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.

[0079] Specifically, the first arc segment 851 is a semicircular arc, and the second arc segment 853 is a semicircular arc.

[0080] 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.

[0081] In some embodiments, the pretreatment component 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, respectively. Figure 2 and Figure 4 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.

[0082] 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.

[0083] In some embodiments, such as Figure 4 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.

[0084] 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.

[0085] Specifically, the fourth arc segment 863 is a semicircular arc.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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 2 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 pressing block 85 and the second pressing block 86 are located on the right side of the electrode wire 001. This allows personnel to rotate the first pressing block 85 and the second pressing block 86 sequentially or simultaneously, improving the operational convenience of the pretreatment component 8 in this embodiment of the invention.

[0090] In some embodiments, the pretreatment component 8 further includes a first guide wheel 891 and a second guide wheel 892, both of which are rotatably mounted on the pretreatment plate 84. The first guide wheel 891 is located upstream of and adjacent to the first conductive element 81, and the second guide wheel 892 is located between and adjacent to the third conductive element 83. The first guide wheel 891 and the second guide wheel 892 can guide the electrode wire.

[0091] The upper wire guide component 100 includes a first sensor 2, a second sensor 3, a wire guide tube 4, a first drive component 5, a hydraulic wire conveying component 6, and a first wire conveying assembly 7.

[0092] like Figure 5 As shown, 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. The second plate 112 is located at the upper end of the first plate 111, and a first wire feeding assembly 7 is located on the upper side of the second plate 112. A 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.

[0093] The bracket 1 also includes a mounting block 12. The 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, and the second mounting portion 122 has a first sensor 2 and a second sensor 3, wherein the first sensor 2 is located above the second sensor 3. The third mounting portion 123 has a second wire feeding clearance hole 1231.

[0094] like Figure 1 and Figure 5 As shown, the first wire feeding assembly 7 is located below the pretreatment component 8 and above the wire guide tube 4. The first 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 first driven shaft 75, and a second pressure roller 76.

[0095] A first drive motor 71 is mounted on the second plate 112. The first drive motor 71 has a first drive shaft, and a first pressure roller 72 is mounted on the first drive shaft. A sliding frame 73 is movably mounted on the second plate 112 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 first driven shaft 75 is rotatably mounted on the sliding frame 73, and a second pressure roller 76 is mounted on the first driven shaft 75. In the clamping position, the first driven shaft 75 and the first 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.

[0096] like Figures 5 to 7 As shown, the first telescopic member 74 drives the sliding frame 73 to move between the open position and the clamping position. Under normal conditions (during cutting operations or when the system is stopped), the sliding frame 73 is displaced to the open position, the first driven shaft 75 is not connected to the first driving 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 component 100 of this embodiment of the invention needs to thread the wire, and when it 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 first drive shaft and the first 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.

[0097] The first 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 turned on, thereby driving the electrode wire forward. When the electrode wire needs to be retracted, the first drive motor rotates in the opposite direction to drive the electrode wire back. This further improves the automation level of the automatic wire feeding of the upper wire guiding component 100 in this embodiment of the invention.

[0098] 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 first drive shaft, and a driven gear 714 is provided on the first 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 causing the first pressure roller 72 to rotate when the first drive shaft rotates. The first drive shaft, through the meshing of the drive gear 713 and driven gear 714, drives the second pressure roller 76 to rotate.

[0099] In some embodiments, such as Figure 8 As shown, the first wire feeding assembly 7 further includes a first elastic member 78 and a connecting pin 79. The connecting pin 79 is movably inserted into the sliding frame 73 and connects to the first telescopic member 74. The first elastic member 78 connects the sliding frame 73 and the connecting pin 79 to form a force on the sliding frame 73 toward the first driven shaft 75. The first elastic member 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.

[0100] Specifically, such as Figure 8 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 first 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 first elastic member 78 is located in the second hole section. The first elastic member 78 connects the bottom wall surface of the second hole section and the large-diameter section to form a force on the sliding frame 73 toward the first hole section.

[0101] Specifically, the first elastic element 78 is a spring. The spring is sleeved on the small-diameter section of the connecting pin 79.

[0102] Specifically, connecting pin 79 is a pin screw.

[0103] In some embodiments, such as Figures 5 to 7As shown, the first 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 disposed on the second plate 112. The first guide member 711 is disposed on the wire guide housing 710, and the second guide member 712 is disposed on the second plate 112. 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 respectively located upstream and downstream of the wire clamping channel 77. The first guide channel 7111, the wire clamping channel 77, the second guide channel 7121, and the wire guide tube 4 are sequentially connected.

[0104] The wire guide housing 710 provides a certain degree of protection for the first wire feeding assembly 7, preventing impurities and dust from the environment from entering the wire clamping channel 77 and the gear transmission area. It also provides mounting points for the first guide member 711. The first wire guide assembly guides the electrode wire entering the upper wire guide component 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 the automatic wire threading.

[0105] Specifically, such as Figure 6 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.

[0106] Furthermore, such as Figure 6As 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.

[0107] like Figure 5 and Figure 9 As shown, the guide tube 4 is movably mounted on the second plate 112 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 out of the bending space. In the wire feeding position, this end of the guide tube 4 is connected to one end of the first guide hole 612. The first driving member 5 is mounted on the mounting plate 11 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.

[0108] 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 mounting plate 11, and the fixing 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 moving section 42. The end of the moving section 42 away from the fixed section 41 (that is, the lower end of the moving section 42) forms one end of the guide wire tube 4.

[0109] 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. 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] In some embodiments, such as Figure 9 As 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.

[0114] 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.

[0115] Specifically, the second sensor 3 is equipped with an amplifier to adjust the detection sensitivity and trigger threshold.

[0116] Therefore, in the upper guide wire component 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.

[0117] 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.

[0118] like Figure 10 and Figure 12 As shown, the hydraulic wire conveying component 6 includes a water spray plate 61 and a wire guide nozzle 62. The water spray plate 61 is located on the lower side of the mounting block 12, 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 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 located on the water spray plate 61. The outlet of the first water hole 611 is connected to the second water hole 621, and the first wire guide hole 612 is connected to the second wire guide hole 622. The water spray path includes the first water hole 611 and the second water hole 621, and the first wire guide path includes the first wire guide hole 612 and the second wire guide hole 622.

[0119] 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.

[0120] Compared with the method in related technologies that uses a thin tube to guide the electrode wire through the lower head, the upper wire guide component 100 of this embodiment of the invention uses the hydraulic wire conveying component 6 to form a water flow to guide the wire through, realizing the wire through the blank area between the outlet of the wire guide nozzle 62 and the guide 201 of the lower head. Its structure is simple and easy to install and maintain.

[0121] 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.

[0122] 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.

[0123] 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 clamp holding the workpiece during cutting. Simultaneously, the water flow and the electrode wire exit from the same outlet (the outlet of the nozzle 64), ensuring contact between the water flow and the electrode wire.

[0124] 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.

[0125] 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.

[0126] Furthermore, in the upper wire guide component 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".

[0127] 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.

[0128] Step B of the automatic threading method in this embodiment of the invention includes the following steps:

[0129] Step B1, determine the starting position of automatic threading: insert the electrode wire into the guide tube 4, move the end of the electrode wire 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.

[0130] Step B2: 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.

[0131] Step B3: 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.

[0132] Step B4: Wire bending detection: In step B3, the second sensor 3 detects whether the electrode wire is bent. If the electrode wire is bent, it is moved back and the wire is re-threaded. 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 moved back and the wire is re-threaded again. If the number of attempts is greater than the preset number, the wire threading failure alarm is triggered and manual processing is required.

[0133] 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.

[0134] Lower guide wire component 200 Figures 13 to 22 As shown.

[0135] The lower guidewire component 200 includes a guide 201 and a catheter assembly 204. The guide 201 is opposite to the outlet of the first guidewire path. The catheter assembly 204 is movably disposed and has a first position and a second position. The catheter assembly 204 has a second guidewire path. The inlet of the second guidewire path is connected to the guide 201. In the first position, the angle between the axis of the second guidewire path and a preset axis is less than or equal to a preset value. The preset axis is the tangent line where the inlet of the second guidewire path is located and is tangent to the wire storage cylinder. In the second position, the outlet of the second guidewire path is adjacent to or abuts against a wire clamping mechanism on one side of the wire storage cylinder.

[0136] Specifically, when the preset value is 0°, in this first position, the angle between the second guidewire path of the catheter assembly 204 and the preset axis is 0°. In other words, the second guidewire path of the catheter assembly 204 coincides with the preset axis, that is, the second guidewire path of the catheter assembly 204 is tangent to the cable storage cylinder. When the preset value is 0.25°, in this first position, the angle between the second guidewire path of the catheter assembly 204 and the preset axis is less than or equal to 0.25°.

[0137] The second guide wire path of the catheter assembly 204 guides the electrode wire to the wire storage cylinder. The catheter assembly 204 is movably configured so that, in the wire threading state, the wire end can be guided by the second guide wire path to the wire clamping mechanism of the wire storage cylinder to complete the wire threading. Also, in the working state, the electrode wire can be guided by the second guide wire path to a position tangent to or adjacent to the wire storage cylinder, thereby avoiding wear of the electrode wire.

[0138] The lower guide wire assembly 200 also includes a turning housing 202, a first guide wheel 2031, a second guide wheel 2032, a second wire feeding assembly 205, a guide tube assembly 204, and a tray 206.

[0139] A support plate 207 is located on the upper side of the turning housing 202, and a guide 201 is located on the support plate 207. The inlet of the guide 201 is opposite to the outlet of the nozzle of the upper wire guide component 100. The electrode wire exiting from the outlet of the nozzle of the upper wire guide component 100 enters the guide 201 through the inlet of the guide 201. The turning housing 202 is provided with a wire guide channel 2021, which has a first port 20211 and a second port 20212. The first port 20211 communicates with the outlet of the guide 201, and the orientation of the second port 20212 is perpendicular to the orientation of the first port 20211. Figure 18 As shown, the first port 20211 faces upwards, and the second port 20212 faces left.

[0140] The first guide wheel 2031 and the second guide wheel 2032 are rotatably disposed in the turning housing 202. The first guide wheel 2031 and the second guide wheel 2032 are spaced apart. A portion of the edge of the first guide wheel 2031 and a portion of the edge of the second guide wheel 2032 are located in the wire guide channel 2021 to guide the electrode wire located in the wire guide channel 2021.

[0141] The second wire feeding assembly 205 includes a transfer slider 2051, a second driving member 2052, a third driving member 2053, a second driving motor 2054, a third pressure roller 2055, a second driven shaft 2056, and a fourth pressure roller 2057.

[0142] A transfer slider 2051 is movably mounted on a turning housing 202 and has a wire-feeding position and an interval position. A second drive member 2052 is mounted on the turning housing 202 and is connected to the transfer slider 2051 to move the transfer slider 2051 between the wire-feeding position and the interval position. A third drive member 2053 is mounted on the transfer slider 2051 and includes a first moving end and a second moving end, which are located on opposite sides of the guide 201. The third drive member 2053 has a clamping state and an open state. A second drive motor 2054 has a second drive shaft, on which a third pressure roller 2055 is mounted. The second drive motor 2054 is mounted on the first moving end. A second driven shaft 2056 is rotatably mounted on the second moving end, and a fourth pressure roller 2057 is mounted on the second driven shaft 2056. In the clamping state, the first and second moving ends are closed to drive the second driving shaft 2056 to form a wire clamping channel between the fourth pressure roller 2057 and the third pressure roller 2055 for clamping the electrode wire. In the open state, the first and second moving ends are opened to disengage the second driving shaft from the second driven shaft 2056 and drive the fourth pressure roller 2057 and the third pressure roller 2055 to disengage from the electrode wire. In the wire transport position, the space between the third pressure roller 2055 and the fourth pressure roller 2057 is opposite to the guide 201. In the interval position, the transfer slider 2051 is spaced apart from the guide 201.

[0143] See Figure 15 The transfer slider 2051 is movably mounted on the support plate 207 in the left-right direction, and the second driving member 2052 is located on the left side of the support plate 207. The second driving member 2052 drives the transfer slider 2051 to move in the left-right direction. The second driving member 2052 is a cylinder.

[0144] When the lower wire guide component 200 is in its normal state, that is, in the non-threading state, the transfer slider 2051 is located at the interval position, which is located on the left side of the guide 201. The second wire feeding assembly 205 is spaced apart from the guide 201 in the left and right direction, so that the second wire feeding assembly 205 will not interfere with the operation of the electrode wire, and can also prevent the water sprayed during operation from entering the second wire feeding assembly 205 and affecting the shaft transmission. At the same time, the third drive component 2053 is in the open state.

[0145] When the lower wire guide component 200 is in the wire threading state, the second drive member 2052 drives the transfer slider 2051 from the interval position to the wire conveying position, so that the third pressure roller 2055 and the fourth pressure roller 2057 are located above the guide 201, and the space between the third pressure roller 2055 and the fourth pressure roller 2057 is opposite to the guide 201. Then, the third drive member 2053 switches from the open state to the clamping state, driving the first moving end and the second moving end to move towards each other, so that the second drive shaft can be connected to the second driven shaft 2056 for transmission, and at the same time, a wire clamping channel is formed between the third pressure roller 2055 and the fourth pressure roller 2057. The electrode wire entering the wire clamping channel is clamped by the third pressure roller 2055 and the fourth pressure roller 2057. In other words, after the second drive member 2052 is in the wire feeding position and the third drive member 2053 is in the clamping state, the second drive motor 2054 is turned on and can drive the second drive shaft to rotate, thereby simultaneously driving the third pressure roller 2055 and the second driven shaft 2056 to rotate. The second driven shaft 2056 drives the fourth pressure roller 2057 to rotate, so that the third pressure roller 2055 and the fourth pressure roller 2057 clamp the electrode wire and move it, so that the electrode wire continues to advance for wire threading.

[0146] After the wire threading is completed, the third driving member 2053 switches from the clamping state to the open state, driving the first moving end and the second moving end to move in opposite directions, thereby increasing the space between the third pressure roller 2055 and the fourth pressure roller 2057, so that the third pressure roller 2055 and the fourth pressure roller 2057 are both disengaged from the electrode wire. Then the second driving member 2052 drives the transfer slider 2051 to move from the wire feeding position to the left to the interval position.

[0147] The first and second moving ends form a two-part structure. When switching between the clamping state and the open state, the two-part structure opens and closes as a whole, thereby preventing workpiece debris from falling into the wire clamping channel and blocking it.

[0148] The lower wire guide component 200 of this embodiment provides power for the advancement of the electrode wire by providing a second wire feeding component 205 upstream (upper side) of the guide 201. This avoids the problem that the electrode wire is difficult to advance or its speed is slowed down due to the weakening of the power effect of other forces in the system that drive the electrode wire forward during the lower wire threading.

[0149] Specifically, such as Figure 15As shown, the transfer slider 2051 is U-shaped and includes a first slider 20511, a connecting block 20512, and a second slider 20513 connected together. The first slider 20511 and the second slider 20513 are located on both sides of the guide 201 in the front-rear direction, respectively. The support plate 207 is provided with a first sliding groove on both the front and rear sides of the guide 201, and a second sliding groove is provided on both the first slider 20511 and the second slider 20513. The first sliding groove and the second sliding groove cooperate to guide the movement of the transfer slider 2051, ensuring the smoothness and accuracy of the movement of the transfer slider 2051.

[0150] like Figure 15 As shown, the third driving member 2053 includes a third telescopic member 20531 and a fourth telescopic member 20532. The third telescopic member 20531 is disposed on the first slider 20511, and the fourth telescopic member 20532 is disposed on the second slider 20513. The moving end of the third telescopic member 20531 forms a first moving end, and the moving end of the fourth telescopic member 20532 forms a second moving end. When the third driving member 2053 switches from the open state to the clamping state, the third telescopic member 20531 and the fourth telescopic member 20532 extend simultaneously, so that the third pressure roller 2055 and the fourth pressure roller 2057 approach each other to form a wire clamping channel. When the third driving member 2053 switches from the clamping state to the open state, the third telescopic member 20531 and the fourth telescopic member 20532 shorten simultaneously, so that the third pressure roller 2055 and the fourth pressure roller 2057 move away from each other.

[0151] Specifically, the telescopic end of the third telescopic member 20531 is provided with a first adapter plate 205311, and the second drive shaft is rotatably mounted on the first adapter plate 205311. The telescopic end of the fourth telescopic member 20532 is provided with a second adapter plate 205321, and the second driven shaft 2056 is rotatably mounted on the second adapter plate 205321. The second drive shaft is provided with a drive gear, and the second driven shaft 2056 is provided with a driven gear. When the third drive member 2053 switches to the clamping state, the drive gear and the driven gear mesh to achieve a transmission connection. When the third drive member 2053 switches to the open state, the drive gear and the driven gear disengage.

[0152] Specifically, both the third telescopic component 20531 and the fourth telescopic component 20532 are cylinders.

[0153] In some embodiments, such as Figure 15As shown, the second wire feeding assembly 205 further includes a second elastic member 2058. The second moving end is provided with the second elastic member 2058, and the second driven shaft 2056 is buoyantly disposed on the second moving end. The second elastic member 2058 abuts against the second driven shaft 2056 to form a force on the second driven shaft 2056 toward the second driving shaft. The second elastic member 2058 has a certain elasticity and deformability. When subjected to compressive force, it can deform and absorb a portion of the kinetic energy, thereby providing a certain floating space for the second driven shaft 2056. When the third telescopic member 20531 drives the second driven shaft 2056 to move from the open state to the clamping state, it avoids hard collisions between the driven gear and the driving gear, avoids hard collisions between the fourth pressure roller 2057 and the third pressure roller 2055, avoids damage to the third pressure roller 2055 and the fourth pressure roller 2057, and avoids excessive compression of the electrode wire.

[0154] Specifically, the second elastic element 2058 is a spring. The second driven shaft 2056 is provided with a bearing, and the second adapter plate 205321 is provided with a mounting groove. The spring is located in the mounting groove, one end of the spring is connected to the wall of the mounting groove, and the other end of the spring abuts against the bearing on the second driven shaft 2056, thereby applying a force toward the second driving shaft on the second driven shaft 2056.

[0155] The second wire feeding assembly 205 further includes a protective shell 2059. Both the first moving end and the second moving end are provided with protective shells 2059. The second drive shaft and the third pressure roller 2055 are both located inside the protective shell 2059 on the first moving end. The second driven shaft and the fourth pressure roller 2057 are both located inside the protective shell 2059 on the second moving end. The protective shell 2059 is provided with a wire guide groove. In the clamping state, the space between the wire guide grooves on the two protective shells 2059 forms a wire guide hole and is connected to the wire clamping channel.

[0156] The protective shell 2059 of the first moving end protects the second drive shaft and its related components, while the protective shell 2059 of the second moving end protects the second driven shaft 2056 and its related components. Furthermore, in this clamping state, the space between the guide grooves on the two protective shells 2059 forms a guide hole, thereby creating channels for guiding the electrode wire on both the upper and lower sides of the wire clamping channel. This extends the guiding length of the electrode wire by the second wire feeding assembly 205 when the electrode wire passes through it, reduces the unused passage between the upper head and the wire clamping channel, and further improves the wire threading success rate and efficiency of the lower guide wire component 200.

[0157] Specifically, such as Figure 16 and Figure 18 As shown, the upper side of the cross-sectional profile of the guide wire groove 20591 is a cone shape with a smaller bottom and a larger top.

[0158] Specifically, the protective shell 2059 of the first mobile terminal is mounted on the first adapter plate 205311, and the protective shell 2059 of the second mobile terminal is mounted on the second adapter plate 205321.

[0159] Furthermore, the protective shell 2059 is provided with an air intake passage. One end of the air intake passage is used to connect to an external air source, and the other end of the air intake passage faces the internal gear and pressure roller. When impurities enter the protective shell 2059, high-pressure airflow can be introduced through the air intake passage to blow out the impurities.

[0160] In some embodiments, such as Figure 17 As shown, the second wire feeding assembly 205 further includes a first protective cover 20510, which is disposed on the transfer slider 2051. The transfer slider 2051, the third driving member 2053, and the second driving motor 2054 are all located inside the first protective cover 20510. The first protective cover 20510 has a clearance channel 205101, which is opposite to the space between the clearance channel 205101 and the third pressure roller 2055 and the fourth pressure roller 2057 so that the electrode wire can pass through the first protective cover 20510. The first protective cover 20510 moves synchronously with the transfer slider 2051, covering the transfer slider 2051 and the shaft transmission-related components located on the transfer slider 2051. The first protective cover 20510 provides further protection for the shaft transmission-related components of the second wire feeding assembly 205, further preventing water and impurities from the environment from entering.

[0161] Specifically, the second wire feeding assembly 205 also includes a second protective cover 20514, which is disposed on the support plate 207. The second protective cover 20514 covers the transfer slider 2051 located at the interval position. In the state of electrode wire cutting operation, it further protects the shaft transmission related components of the second wire feeding assembly 205 and further prevents water and impurities in the environment from entering.

[0162] Furthermore, such as Figure 18 As shown, the lower guide wire component 200 also includes a fourth conductive block 208, which is disposed inside the turning housing 202. The fourth conductive block 208 is located between the first guide wheel 2031 and the second guide wheel 2032, and is in contact with the electrode wire. When the electrode wire needs to be cut, the fourth conductive block 208 inside the turning housing 202 cooperates with the fourth conductive block 208 in the upper guide wire component to energize the electrode wire.

[0163] like Figure 13 and Figure 14As shown, the catheter assembly 204 includes a telescopic sleeve 2041 and a sliding drive 2042. One end of the telescopic sleeve 2041 is rotatably mounted on the turning housing 202. The telescopic sleeve 2041 forms a second guidewire path. One end of the telescopic sleeve 2041 is opposite to the second port 20212. The sliding drive 2042 is movably mounted along a set trajectory and has a first position and a second position. The straight line of the set trajectory intersects the axis of the telescopic sleeve 2041. The sliding drive 2042 is connected to the telescopic sleeve 2041 to drive the other end of the telescopic sleeve 2041 to move. In the first position, the axis of the telescopic sleeve 2041 is tangent to the wire storage cylinder. In the second position, the other end of the telescopic sleeve 2041 is adjacent to or abuts against the wire clamping mechanism of the wire storage cylinder.

[0164] The telescopic sleeve 2041 can be extended and shortened. The other end of the telescopic sleeve 2041 can move relative to the first end of the telescopic sleeve 2041. When the other end of the telescopic sleeve 2041 moves relative to the first end of the telescopic sleeve 2041, the telescopic sleeve 2041 is extended and shortened.

[0165] When the lower wire guide component 200 is in the wire threading state, the sliding drive component 2042 is located in the second position, and the other end of the telescopic sleeve 2041 is adjacent to or abuts against the wire storage cylinder, thereby guiding the wire end of the electrode wire to the position adjacent to or abutting against the wire storage cylinder, completing the wire threading process of the electrode wire in the lower part of the workpiece. After the wire threading is completed, the sliding drive component 2042 moves to the right along the set trajectory to the first position. At the same time, the sliding drive component 2042 drives the other end of the telescopic sleeve 2041 to move to the right. Since the straight line of the set trajectory intersects the axis of the telescopic sleeve 2041, when the sliding drive component 2042 drives the other end of the telescopic sleeve 2041 to move to the right, it not only shortens the telescopic sleeve 2041, but also rotates the telescopic sleeve 2041 (to... Figure 13 As shown in the orientation (rotation is counterclockwise), the telescopic sleeve 2041 is shortened, increasing the distance between the telescopic sleeve 2041 and the wire storage drum. It also makes the axis of the telescopic sleeve 2041 tangent to the wire storage drum. Consequently, during system operation, the electrode wire coming out from the other end of the telescopic sleeve 2041 is tangent to the wire storage drum, so that there are no bends or angles in the area between the telescopic sleeve 2041 and the wire storage drum, thereby avoiding wear between the electrode wire and the telescopic sleeve 2041.

[0166] In this embodiment of the invention, the lower wire guide component 200 drives the telescopic sleeve 2041 to extend, retract, and rotate via the sliding drive component 2042, thereby causing the electrode wire to present a different positional relationship with the wire storage drum in the wire threading state and the working state. This facilitates the wire threading of the electrode wire, avoids wear of the electrode wire during operation, and improves the service life of the electrode wire.

[0167] Furthermore, such as Figure 13 As shown, the position of the other end of the telescopic sleeve 2041 is higher than that of the first end of the telescopic sleeve 2041, so that the telescopic sleeve 2041 is in a state of left high and right low. In other words, the first end of the telescopic sleeve 2041 is located at the lowest end of the telescopic sleeve 2041, thereby preventing water sprayed during operation from entering the telescopic sleeve 2041.

[0168] In some embodiments, such as Figure 18 and Figure 19 As shown, the catheter assembly 204 further includes a connector 2043, a catheter clamp 2044, and a connecting sleeve 2045. The connector 2043 is rotatably connected to the turning housing 202. The connector 2043 has a mounting hole. The catheter clamp 2044 is disposed in the mounting hole. The catheter clamp 2044 has a fourth guide channel 20441. One end of the catheter clamp 2044 is connected to the connecting sleeve 2045, and the other end of the catheter clamp 2044 is connected to one end of the telescopic sleeve 2041. The connecting sleeve 2045 has a third guide channel 20451. The connecting sleeve 2045 faces and is adjacent to the second port 20212. The third guide channel 20451 has a tapered section. The large-diameter end of the tapered section faces the second port 20212. The third guide channel 20451, the fourth guide channel 20441, and the telescopic sleeve 2041 are connected in sequence. One end of the telescopic sleeve 2041 is rotatably connected to the turning shell 202 via the connector 2043, and the end of the electrode wire coming out of the second port 20212 is guided into the third guide channel 20451 of the connector 2045 via the connector 2045.

[0169] Specifically, the diameter of the large-diameter end of the tapered section of the third guide channel 20451 is larger than the diameter of the second port 20212, and the projection of the large-diameter end of the tapered section on the turning shell 202 can cover the second port 20212, thereby ensuring that the thread head led out from the second port 20212 enters the large-diameter end of the tapered section and thus enters the telescopic sleeve 2041.

[0170] In some embodiments, the connector 2043 is provided with a tracheal connection hole for connecting to an external air source. The conduit assembly 204 further includes a limiting ring 2046, and the conduit clamp 2044 is provided with two limiting rings 2046. The two limiting rings 2046, the outer wall surface of the conduit clamp 2044, and the inner wall surface of the mounting hole define an air inlet chamber 2047. The conduit clamp 2044 is provided with an air inlet hole 20442. The tracheal connection hole, the air inlet chamber 2047, the air inlet hole 20442, and the fourth guide channel 20441 are sequentially connected.

[0171] If dirt or impurities enter the telescopic sleeve 2041, it will cause blockage. In this embodiment of the invention, the lower guide wire component 200, by providing an air inlet channel, can blow high-pressure airflow into the air inlet channel. After entering the fourth guide channel 20441, the airflow flows to the telescopic sleeve 2041 and finally exits from the other end of the telescopic sleeve 2041, thereby blowing out impurities blocking the telescopic sleeve 2041 and ensuring the smoothness of the electrode wire threading process. Simultaneously, after the airflow enters the fourth guide channel 20441, a portion also flows to the connecting sleeve 2045 and exits from the connecting sleeve 2045, thereby also blowing out impurities that have entered the connecting sleeve 2045. Furthermore, the continuous airflow can also prevent impurities from entering the fourth guide channel 20441 from the direction of the connecting sleeve 2045.

[0172] Specifically, the limiting ring 2046 has an annular groove in the middle of its axial direction, and the conduit assembly 204 further includes a sealing ring 2048, which is disposed in the annular groove and abuts against the inner wall of the mounting hole, thereby sealing the air inlet chamber between the two limiting rings 2046 to ensure the blowing effect of the high-pressure airflow.

[0173] In some embodiments, such as Figure 13 , Figure 14 , Figure 19 and Figure 20 As shown, the telescopic sleeve 2041 includes a first guide tube 20411, a second guide tube 20412, and a third guide tube 20413. The second guide tube 20412 is sleeved on the first guide tube 20411 and slidably connected to the first guide tube 20411. The third guide tube 20413 is sleeved on the second guide tube 20412 and slidably connected to the second guide tube 20412. One end of the first guide tube 20411 and one end of the third guide tube 20413 are both connected to the connector 2043. The second guide tube 20412 is connected to the sliding drive member 2042. The end of the second guide tube 20412 facing away from the first guide tube 20411 forms the other end of the telescopic sleeve 2041. The first guide tube 20411 and the second guide tube 20412 guide the electrode wire, and the third guide tube 20413 supports the first guide tube 20411 so that one end of the telescopic sleeve 2041 can be rigidly connected to the connector 2043, ensuring the connection strength between the telescopic sleeve 2041 and the connector 2043.

[0174] Specifically, the right end of the first guide tube 20411 and the right end of the third guide tube 20413 form one end of the telescopic sleeve 2041, and the other end of the first guide tube 20411 is connected to the catheter clamp 2044.

[0175] Furthermore, such as Figure 20As shown, the telescopic sleeve 2041 further includes an extension tube 20414, which is located at one end of the second guide tube 20412 away from the first guide tube 20411. The extension tube is connected to the second guide tube 20412 to extend the guide path of the electrode wire.

[0176] The sliding drive component 2042 is a slide cylinder, and the slider of the slide cylinder is rotatably connected to the second guide tube 20412. Considering the basic machine tool structure in the system, a distance must be reserved between the air inlet end of the slide cylinder and the cylinder body of the wire storage drum.

[0177] In some embodiments, such as Figure 13 , Figure 14 , Figure 21 and Figure 22 As shown, tray 206 is connected to turning shell 202. Tray 206 is provided with cable routing channel 2061 and guide groove 2062. Guide groove 2062 is located on the side of turning shell 202 facing away from guide 201 in the vertical direction. One end (right end) and the other end (left end) of guide groove 2062 are spaced apart in the vertical direction. One end of guide groove 2062 is opposite to turning shell 202 in the vertical direction. Cable routing channel 2061 includes first cable opening 20161. 1. The second inlet 20612 and the third inlet 20613, the first inlet 20611 is located at the other end of the guide channel 2062, the second inlet 20612 is located in the middle of the turning shell 202 in the vertical direction and is spaced apart from the turning shell 202, and the third inlet 20613 is located at one end of the guide channel 2062 and is located on the side of the guide channel 2062 away from the turning shell 202 in the vertical direction.

[0178] The guide 201 is located on the upper side of the turning housing 202, and the guide channel 2062 is located on the lower side of the turning housing 202. The right and left ends of the guide channel 2062 are spaced apart in the vertical direction, meaning that the guide channel 2062 is inclined, which allows water to be discharged from the guide channel 2062 and prevents water from accumulating on the guide channel 2062. Specifically, the left end of the guide channel 2062 is higher than the right end. In other words, the water discharged from the drain of the turning housing 202 flows to the right end of the guide channel 2062 and then flows out from the right end of the guide channel 2062.

[0179] The first cable inlet 20611 is located at the left end of the guide channel 2062, away from the turning shell 202 and also away from the workpiece. This prevents water from splashing onto the first cable inlet 20611 and facilitates the entry and exit of various electrical devices through the cable routing channel 2061. The second cable inlet 20612 is located in the middle of the turning shell 202 in the vertical direction. That is, the second cable inlet 20612 is at the same height as the middle of the turning shell 202, thus separating the second cable inlet 20612 from the drainage channel of the turning shell 202. The second cable inlet 20612 forms a higher position relative to the drainage channel of the turning shell 202, preventing water from entering the second cable inlet 20612, and thus facilitating the entry and exit of various electrical devices through the cable routing channel 2061. The third cable inlet 20613 is located at the lower end of the guide channel 2062. The guide channel 2062 forms an upper shield for the third cable inlet 20613. At the same time, the third cable inlet 20613 faces downward, thereby preventing water from entering the third cable inlet 20613 and facilitating the entry and exit of various electrical equipment through the cable routing channel 2061.

[0180] Specifically, the first wire port 20611 is the wire inlet, the second wire port 20612 is the wire inlet, and the third wire port 20613 is the wire outlet. The electrical components involved in this device (such as the driving component of the second wire feeding assembly 205 and the second drive motor 2054) can be routed through the wiring channel 2061, so that the wiring harness of the electrical components is better isolated from the water, and the electrical components are prevented from failing due to the influence of water.

[0181] Specifically, the second wire port 20612 faces the support plate 207. The distance between the second wire port 20612 and the support plate 207 is relatively short. The support plate 207 can protect the second wire port 20612, and at the same time, it is convenient for the wire harness of the electrical components on the upper side of the support plate 207 to enter the wiring channel 2061 through the second wire port 20612.

[0182] The signal trigger 300 is located between the outlet of the second guide wire path and the wire clamping mechanism 4002, axially along the cylinder 4001 of the wire storage cylinder 400, with the signal trigger 300 positioned on the side of the electrode wire away from the wire clamping mechanism 4002. (See also...) Figure 23 The electrode wire tip is held by the wire clamping mechanism 4002, indicating that the wire threading is complete. When cutting begins from this position, the cylinder 4001 rotates clockwise, causing the electrode wire, guided from the second wire path, to gradually wind around the cylinder. Simultaneously, the cylinder 4001 moves backward as a whole. During continuous cutting, the cylinder 4001 of the wire storage cylinder alternates between clockwise and counterclockwise rotations to drive the electrode wire to reciprocate. At the same time, the cylinder 4001 moves backward along its axial direction (i.e.,...). Figure 23The electrode wire moves back and forth in the forward and backward direction to ensure that the electrode wire between the cylinder 4001 and the telescopic sleeve 2041 (second guide wire path) is tangent to the cylinder 4001. When wire feeding is required, the electrode wire needs to be retracted along the second guide wire path. At this time, the cylinder needs to be reversed and the cylinder 4001 moves forward. After the wire feeding is completed, the cylinder 4001 causes the electrode wire to deviate, which triggers the signal trigger 300 to emit a signal. The system controls the wire clamping mechanism to open, so that the electrode wire is retracted.

[0183] During wire feeding, the process of the wire storage drum 400 causing the electrode wire to deviate can be achieved by controlling the movement of the drum body 4001 of the wire storage drum 400 along its axial direction. For example, during wire feeding, the drum body 4001 of the wire storage drum 400 moves forward. When the wire is fed to the limit position, the drum body 4001 continues to move forward a certain distance, thereby causing the electrode wire to deviate and triggering the signal trigger 300.

[0184] Furthermore, the signal trigger 300 is an electrode rod. In step E, during wire feeding, the second conductive element and the electric shock rod are energized. After the electrode wire is fed into the wire storage cylinder (i.e., no electrode wire is wound on the cylinder), the wire storage cylinder continues to move forward, causing the electrode wire between the wire clamping mechanism and the telescopic sleeve to shift. The shifted electrode wire will touch the electrode rod, thereby forming a conductive circuit between the second conductive element, the electrode wire, and the electrode rod, triggering a system signal to open the wire clamping mechanism. The first wire conveying component 7 of the upper wire guide component 100 drives the electrode wire back to the starting position.

Claims

1. An automatic wire threading device for reciprocating wire electrical discharge machining, characterized in that, Includes a bracket (1) and a component mounted on the bracket (1): The pretreatment component (8) includes a first conductive element (81), a second conductive element (82), a third conductive element (83), and a clamping element. The first conductive element (81), the third conductive element (83), and the second conductive element (82) are spaced apart 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. The clamping element is used to clamp the electrode wire. The first conductive element and the second conductive element are used to energize and heat the front end of the electrode wire until it is red-hot. The second conductive element and the third conductive element are used to burn off the electrode wire between the second conductive element and the third conductive element, and the burn-off point forms a pointed wire end. The upper wire guide component (100) includes a first sensor (2) and a hydraulic wire guide component (6). The first sensor (2) is used to detect the starting position of the electrode wire tip. The first sensor (2) is located between the pretreatment component (8) and the hydraulic wire guide component (6). The hydraulic wire guide component (6) is provided with a water spray path and a first wire guide path. The outlet of the water spray path is adjacent to the outlet of the wire guide path. The lower guidewire assembly (200) includes a guide (201) and a catheter assembly (204). The guide (201) is opposite to the outlet of the first guidewire path. The catheter assembly (204) is movably disposed and has a first position and a second position. The catheter assembly (204) has a second guidewire path. The inlet of the second guidewire path is connected to the guide (201). In the first position, the angle between the axis of the second guidewire path and a preset axis is less than or equal to a preset value. The preset axis is the tangent line where the inlet of the second guidewire path is located and is tangent to the wire storage cylinder. In the second position, the outlet of the second guidewire path is adjacent to or abuts against a wire clamping mechanism on one side of the wire storage cylinder. and A signal trigger (300) is located between the outlet of the second guide wire path and the wire clamping mechanism, on the axial direction of the body of the wire storage cylinder (400), and the signal trigger is located on the side of the electrode wire away from the wire clamping mechanism.

2. The automatic wire threading device for reciprocating wire EDM as described in claim 1, characterized in that, The clamping member includes a first clamping block (85) and a second clamping block (86). The first clamping block (85) is rotatably disposed on the bracket (1) and has an overlapping position and a first disengaged position. In the overlapping position, the first clamping block (85) overlaps on the first conductive member (81) to increase the movement resistance of the electrode wire. In the first disengaged position, the first clamping block (85) is spaced apart from the first conductive member (81). The second clamping block (86) is rotatably disposed on the bracket (1) and has a fixed position and a second disengaged position. In the fixed position, the second clamping block (86) abuts against the second conductive member (82) to fix the electrode wire. In the second disengaged position, the second clamping block (86) is spaced apart from the second conductive member (82).

3. The automatic wire threading device for reciprocating wire EDM as described in claim 1, characterized in that, The bracket (1) is provided with a first wire feeding clearance hole (1211) and a bending space; the upper wire guide component includes a second sensor (3), a wire guide tube (4) and a first drive member (5). The detection end of the first sensor (2) and the detection end of the second sensor (3) are both facing the bending space. The wire 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 wire guide tube (4) is located in the first wire feeding clearance hole (1211) and is disengaged from the bending space. The first drive member (5) is disposed on the bracket (1) and is connected to the wire guide tube (4) to drive the wire guide tube (4) to move between the disengagement position and the wire feeding position.

4. The automatic wire threading device for reciprocating wire EDM as described in claim 3, characterized in that, The upper guide wire component includes a first wire feeding assembly (7), which is located upstream of the guide wire tube (4). The first wire feeding assembly (7) includes: 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 first drive shaft, and the first pressure roller (72) is mounted on the first 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 first driven shaft (75) and a second pressure roller (76) are provided. The first driven shaft (75) is rotatably mounted on the sliding frame (73), and the second pressure roller (76) is mounted on the first driven shaft (75). In the clamping position, the first driven shaft (75) and the first 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.

5. The automatic wire threading device for reciprocating wire EDM as described in claim 3, 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 wire threading device for reciprocating wire EDM as described in claim 1, characterized in that, The lower guide wire component includes a turning shell (202), a first guide wheel (2031), and a second guide wheel (2032). The turning shell (202) is provided with a guide wire channel (2021). The guide wire channel (2021) has a first port (20211) and a second port (20212). The first port (20211) is connected to the outlet of the guide (201). The first guide wheel (2031) and the second guide wheel (2032) are rotatably disposed in the turning shell (202). The first guide wheel (2031) and the second guide wheel (2032) are spaced apart. A portion of the edge of the first guide wheel (2031) and a portion of the edge of the second guide wheel (2032) are located in the guide wire channel (2021) to guide the electrode wire located in the guide wire channel (2021).

7. The automatic wire threading device for reciprocating wire EDM as described in claim 6, characterized in that, The catheter assembly (204) includes a telescopic sleeve (2041) and a sliding drive (2042). One end of the telescopic sleeve (2041) is rotatably mounted on the turning housing (202). The telescopic sleeve (2041) forms a second guidewire path. The one end of the telescopic sleeve (2041) is opposite to the second port (20212). The sliding drive (2042) is movably mounted along a set trajectory and has a first position and a second position. The straight line of the set trajectory intersects with the telescopic sleeve. The axes of (2041) intersect, and the sliding drive (2042) is connected to the telescopic sleeve (2041) to drive the other end of the telescopic sleeve (2041) to move. In the first position, the angle between the axis of the telescopic sleeve (2041) and the preset axis is less than or equal to the preset value. The preset axis is the tangent line where one end of the telescopic sleeve is located and is tangent to the wire storage cylinder. In the second position, the other end of the telescopic sleeve (2041) is adjacent to or abuts against the wire clamping mechanism of the wire storage cylinder.

8. The automatic wire threading device for reciprocating wire EDM as described in claim 7, characterized in that, The catheter assembly (204) further includes a connector (2043), a catheter clamp (2044), and a connecting sleeve (2045). The connector (2043) is rotatably connected to the turning housing (202). The connector (2043) has a mounting hole, and the catheter clamp (2044) is disposed in the mounting hole. The catheter clamp (2044) has a fourth guide channel (20441). One end of the catheter clamp (2044) is connected to the connecting sleeve (2045), and the other end of the catheter clamp (2044) is connected to the connecting sleeve (2045). One end of the telescopic sleeve (2041) is connected to the connecting sleeve (2045), which has a third guide channel (20451). The connecting sleeve (2045) faces and is adjacent to the second port (20212). The third guide channel (20451) is provided with a tapered section, the large diameter end of which faces the second port (20212). The third guide channel (20451), the fourth guide channel (20441), and the telescopic sleeve (2041) are connected in sequence.

9. The automatic wire threading device for reciprocating wire EDM as described in claim 1, characterized in that, The lower wire guide component further includes a support plate (207) and a second wire feeding assembly (205). The support plate (207) is mounted on a bracket, and the second wire feeding assembly (205) includes: The transfer slider (2051) and the second drive member (2052) are provided. The transfer slider (2051) is movably disposed on the bracket and has a wire feeding position and an interval position. The second drive member (2052) is disposed on the bracket and is connected to the transfer slider (2051) to drive the transfer slider (2051) to move between the wire feeding position and the interval position. The third driving member (2053) is disposed on the transfer slider (2051). The third driving member (2053) includes a first moving end and a second moving end, which are respectively located on both sides of the guide (201). The third driving member (2053) has a clamping state and an open state. The second drive motor (2054) and the third pressure roller (2055) are located at the first moving end. The second drive motor (2054) has a second drive shaft and the third pressure roller (2055) is provided on the second drive shaft. The second driven shaft (2056) and the fourth pressure roller (2057) are provided, wherein the second driven shaft (2056) is rotatably disposed on the second moving end, and the fourth pressure roller (2057) is disposed on the second driven shaft (2056); In the clamping state, the first moving end and the second moving end are closed to drive the second driving shaft and the second driven shaft (2056) to form a wire clamping channel between the fourth pressure roller (2057) and the third pressure roller (2055) for clamping the electrode wire. In the open state, the first moving end and the second moving end are opened to disengage the second driving shaft from the second driven shaft (2056) and drive the fourth pressure roller (2057) and the third pressure roller (2055) to disengage from the electrode wire. At the wire feeding position, the space between the third pressure roller (2055) and the fourth pressure roller (2057) is opposite to the guide (201), and at the interval position, the transfer slider (2051) is spaced apart from the guide (201).

10. An automatic wire threading method for reciprocating wire electrical discharge machining, characterized in that, The automatic wire threading device for reciprocating wire EDM as described in any one of claims 1 to 9 includes the following steps: Step A, Pre-processing: The first conductive element and the second conductive element are energized to heat the front section of the electrode wire until it is red-hot. At the same time, tension is applied to the electrode wire to straighten the front section of the electrode wire. Then, the first conductive element is turned off and the third conductive element is turned on to burn off the electrode wire between the second conductive element and the third conductive element, and the burn-off point forms a pointed wire end. Step B: Determine the starting position of automatic threading: Move the electrode wire with the pointed tip obtained in Step A below the detection position of the first sensor, and then move the electrode wire upward until the detection signal of the first sensor disappears. Mark this position as the starting position of automatic threading. Step C: Water flow guided automatic wire threading: Move the electrode wire to the outlet of the first guide wire path, pump water into the water spray path, and the water sprays out from the outlet of the water spray path. The sprayed water flow drives the electrode wire to move towards the guide for wire threading. Step D: Guide the electrode wire to the wire storage cylinder: Move the catheter assembly to the second position and guide the electrode wire from the guide into the second guide wire path to the wire clamping mechanism adjacent to or abutting the wire storage cylinder. As the electrode wire continues to advance, the end of the electrode wire enters the wire clamping mechanism, and the wire clamping mechanism clamps the electrode wire to complete the wire threading. Step E: When it is necessary to change or re-thread the wire, the wire storage drum first releases the wire. During the release, the wire storage drum moves along the axial direction of its body. After the wire release is completed, the electrode wire is offset to the signal trigger. The signal trigger is triggered by the electrode wire and sends a signal. The wire clamping mechanism on one side of the wire storage drum opens, so that the wire end of the electrode wire is released. Then, the electrode wire is driven back to the starting position, and steps B, C and D are performed to re-thread the wire. Alternatively, after changing the wire, steps A, B, C and D are performed to re-thread the wire.

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