Automatic wire threading device for medium-large aperture linear cutting

Abstract

The utility model discloses an automatic wire threading device for medium and large aperture wire cutting, which comprises a wire guiding conduit, a wire guider and a power component, the wire guiding conduit comprises an upper beam wire guiding conduit and a lower beam wire guiding conduit, and the upper beam wire guiding conduit and the lower beam wire guiding conduit respectively extend along the length directions of an upper beam and a lower beam of a wire cutting device. The pipe orifices close to one end of the wire guide wheel are oppositely arranged up and down, and a wire guide full path is constructed through combination; a wire guiding full path is constructed through a wire guiding guide pipe, a wire guiding device serves as a conveying body, and a power component drives the wire guiding device to sequentially wind an upper beam and a lower beam to the lower end of a wire storage barrel from the upper end of the wire storage barrel of the wire cutting device along the wire guiding full path; and under the driving of the power part, the molybdenum wire is reversely pulled by the wire guiding device along a wire guiding full path and is reset to the upper end of the wire storage cylinder. Full-path guiding is carried out on the molybdenum wire through the wire guiding device, full-path guiding automatic wire threading is achieved, the problem that in the prior art, the molybdenum wire is prone to deviating from the wire threading path is solved, and the device is simple in structure, convenient to install and low in manufacturing and transformation cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to wire cutting machine technical field, concretely relates to a big aperture wire cutting automatic silk threading device. BACKGROUND

[0002] The basic principle of the wire cutting machine tool is to use a fine metal wire as an electrode to cut and shape the workpiece through pulse spark discharge. Specifically, the molybdenum wire does not directly contact the workpiece body during wire cutting; after the molybdenum wire is electrified, it is not the metal wire itself that produces high temperature to cut, but instantaneous discharge between the molybdenum wire and the workpiece, which produces high temperature and makes the workpiece locally melt or vaporize, thereby realizing cutting. However, since the wire cutting machine tool needs to be manually threaded by professional personnel, the process is complex, and during the wire cutting process, if other cutting needs to be processed on the same workpiece, the staff needs to be on duty to wait for the cutting of one position to be completed, then manually thread the wire, and complete the next round of cutting, which is low in production efficiency and high in processing cost.

[0003] The utility model patent with the patent publication number CN114393262A discloses an intelligent automatic silk threading numerical control wire cutting machine tool, which clamps the guide needle wire through the silk clamping movable chuck, moves the silk clamping movable chuck downward to the limiting frame of the lower beam by the lifting device, moves the guide needle wire to the wire connector of the lower beam, then makes the wire connector in the silk threading state, and finally winds the wire connector on the silk winding drum through the driving device and the connecting part.

[0004] The utility model patent with the patent publication number CN220698462U discloses a silk threading guide pipe limiting mechanism, which slides to the lowermost end along the slide rail through the sliding seat arranged on the upper beam, drives the silk threading guide pipe to move downward, penetrates through the limiting hole, and then is connected with the wire inlet on the butt joint seat, forming a smooth silk threading channel. The silk electrode enters the upper end of the silk threading guide pipe through the clamping and feeding mechanism, penetrates through the silk threading guide pipe, and then exits from the lower end, and then enters the silk threading mechanism of the lower beam from the wire inlet.

[0005] The utility model patent with the patent publication number CN113996876B discloses a wire cutting machine tool automatic silk threading device and automatic silk threading and automatic silk winding method, which sends the molybdenum wire to the lower beam through the wire feeding wheel and the silk guide pipe arranged on the upper beam of the wire cutting device, clamps the molybdenum wire through the silk clamping part arranged on the lower beam, and drives the clamping jaw to move to the silk winding drum arranged on the lower beam, thereby realizing the guidance of the molybdenum wire. The utility model patent with the patent publication number CN106964858B also discloses a similar guide rail to guide the molybdenum wire.

[0006] The utility model discloses a patent publication no. CN119304289A discloses an automatic threading device and a medium traveling wire cutting machine tool, which is provided with a driving wire feeding wheel, a wire guide wheel and a wire guide pipe below the wire cutting device. The driving wire feeding wheel and the wire guide wheel transmit the end of the molybdenum wire moved into the lower eye mold to the wire guide pipe, and under the power of the driving wire feeding wheel, the molybdenum wire moves along the wire guide pipe to the wire storage cylinder for fixation.

[0007] The utility model discloses a patent publication no. CN116786926A discloses a wire cutting automatic threading and dismounting method and device. The molybdenum wire is guided through the workpiece from above the workpiece by a threading pipe, and is fed upward by the wire feeding device below the workpiece. The molybdenum wire is clamped by a wire clamping device and is pulled back to the appropriate position by a wire winding cylinder. A soft shaft line hook is used to pull the end of the molybdenum wire to the wire winding cylinder.

[0008] The above-mentioned existing wire cutting device automatic threading device uses a wire feeding wheel to feed the wire, or uses a guide rail slider to guide the wire feeding, or uses a wire feeding wheel and a guide pipe to feed the wire, and uses a wire hooking device to pull the molybdenum wire along the guide pipe direction to realize the wire cutting automatic threading. However, the upper beam threading path and the lower beam threading path in the above-mentioned wire cutting device automatic threading device are separate half-path wire guiding paths, and the threading path between the upper beam and the lower beam is disconnected, and the full-path wire guiding of the wire cutting device is not established, which cannot guide the molybdenum wire along the full path, and the problem of easy deviation of the molybdenum wire from the threading path still exists.

[0009] At the same time, the existing wire cutting automatic threading device uses molybdenum wire as the transmission main body, but the molybdenum wire is thin and has poor rigidity, and it is necessary to accurately control the transmission direction of the molybdenum wire to avoid its deviation from the transmission path. Since the threading path between the upper beam and the lower beam in the existing wire cutting automatic threading device is disconnected, in order to ensure that the molybdenum wire can be accurately transmitted to the upper beam or the lower beam, it is necessary to establish a high-precision wire guiding assembly between the upper beam and the lower beam. Thus, not only the cost is high, but also the difficulty of installation, debugging and maintenance is great.

[0010] Therefore, it is urgent to provide a wire cutting automatic threading device with simple structure, easy installation and low cost to realize full-path guiding automatic threading and solve the problem of easy deviation of the molybdenum wire from the threading path in the prior art. Utility model content

[0011] The utility model discloses a wire cutting automatic threading device which can realize full-path guiding automatic threading and has simple structure and low cost.

[0012] To achieve the above technical purpose, the technical scheme of the utility model provides a medium-large aperture wire cutting automatic threading device, which comprises:

[0013] The wire guide tube comprises an upper beam wire guide tube and a lower beam wire guide tube, which are arranged along the length direction of the upper beam and the lower beam of the wire cutting device respectively, and the nozzles near the end of the wire guide wheel are arranged oppositely, and the upper beam wire guide tube and the lower beam wire guide tube are combined to form a wire guide path.

[0014] The wire guide device comprises a wire guide tube and a wire guide device, wherein the wire guide tube has a diameter matched with the inner diameter of the wire guide tube and a length greater than the length of the wire guide path, and one end of the wire guide tube is provided with a wire hanging part.

[0015] The power component is used to drive the wire guide device to move from the upper end of the wire storage cylinder along the wire guide path to the lower end of the wire storage cylinder, and reversely pull the wire guide device to reset to the upper end of the wire storage cylinder.

[0016] Preferably, the pipe body of the upper beam wire guide tube extends from the position close to the upper end of the wire storage cylinder to the free end of the upper beam, one end of which is inclined and curved downward toward the wire storage cylinder, and the other end is curved downward to a perpendicular angle around the upper wire guide wheel of the wire cutting device; the pipe body of the lower beam wire guide tube extends from the free end of the lower beam to the position close to the lower end of the wire storage cylinder, one end of which is toward the wire storage cylinder, and the other end is curved upward to a perpendicular angle around the lower wire guide wheel of the wire cutting device.

[0017] Preferably, the end of the upper beam wire guide tube is curved downward to a perpendicular angle around the upper wire guide wheel of the wire cutting device and is aligned with the upper eye die of the wire cutting device; the end of the lower beam wire guide tube is curved upward to a perpendicular angle around the lower wire guide wheel of the wire cutting device and is aligned with the lower eye die of the wire cutting device.

[0018] Preferably, the wire guide tube is offset relative to the tensioning position of the molybdenum wire, and a wire passing groove is formed on the pipe body of the wire guide tube on the side toward the tensioning position of the molybdenum wire.

[0019] Preferably, the body of the wire guide device is a spring steel wire sheath.

[0020] Preferably, at least two wire passing holes with different axes are formed on the wire hanging part.

[0021] Preferably, the first wire passing hole is inclined and penetrates from the center of the end face of the wire guide device to the outer wall of the wire guide device, the second wire passing hole is inclined and penetrates from one side of the outer wall of the wire guide device to the other side of the outer wall of the wire guide device, and the included angle between the second wire passing hole and the first wire passing hole is an acute angle.

[0022] Preferably, the power component is two driving wheels arranged tangentially, and the driving wheels are fixed on the cylinder seat of the wire storage cylinder through a mounting seat.

[0023] Preferably, the medium-to-large diameter wire cutting automatic wire threading device further includes a guide member, which is disposed on the lower eyepiece of the wire cutting device and is used to guide the end of the wire threader that passes downward from the upper beam wire thread guide into the lower beam wire thread guide.

[0024] Preferably, a tension wheel assembly is provided along the entire path of the lead wire.

[0025] Compared with the prior art, the beneficial effects of this utility model include:

[0026] The automatic wire threading device for medium and large aperture wire EDM described in this utility model constructs a complete wire threading path through a wire guide tube. Using a wire guide as the main conveyor, a power unit drives the wire guide along the complete wire threading path from the upper end of the wire storage drum of the wire EDM device, sequentially winding around the upper and lower beams of the wire EDM device to the lower end of the wire storage drum. Driven by the power unit, the wire guide then pulls the molybdenum wire in the opposite direction along the complete wire threading path, resetting it to the upper end of the wire storage drum. By guiding the molybdenum wire along the entire path through the wire guide, automatic wire threading is achieved, solving the problem of molybdenum wire easily deviating from the threading path in existing technologies. The automatic wire threading device for medium and large aperture wire EDM has a simple structure, is easy to install, and has extremely low manufacturing and modification costs, realizing the transformation of low-cost automatic wire threading equipment for wire EDM and greatly reducing the processing cost of automatic wire threading for wire EDM.

[0027] The automatic wire threading device for medium and large diameter wire cutting described in this utility model has at least two wire threading holes with different axes on the wire hanging member, so that the molybdenum wire passes through the two wire threading holes in sequence. Since the two wire threading holes are not on the same axis, the molybdenum wire body will bend during the wire threading process and will not automatically recover. The end of the molybdenum wire bends to form a hook shape, which cooperates with the wire threading hole to form a self-locking mechanism, ensuring that the molybdenum wire can be conveniently and firmly set on the wire hanging member. The end of the molybdenum wire can be fixed to the wire guide without the need for a complicated locking device.

[0028] The automatic wire threading device for medium and large diameter wire cutting described in this utility model is designed with the wire guide tube offset relative to the molybdenum wire tensioning position, and the wire threading groove is opened on the side of the wire guide tube facing the molybdenum wire tensioning position. This allows the molybdenum wire to pass through the wire threading groove from the wire guide tube under tension, forming an independent molybdenum wire tensioning circuit. This ensures that the molybdenum wire is completely separated from the wire guide tube in the molybdenum wire tensioning circuit, avoiding the problem of the molybdenum wire easily breaking due to friction between the molybdenum wire and the inner wall of the wire guide tube under tension. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the automatic wire threading device for medium and large diameter wire cutting, as described in this embodiment of the utility model, mounted on a wire cutting device.

[0030] Figure 2 yes Figure 1 Cross-sectional view.

[0031] Figure 3 This is a schematic diagram showing the state of the lead wire traveling along the lead wire guide along the entire lead wire path as described in this embodiment of the utility model.

[0032] Figure 4 This is a schematic diagram of the state of the molybdenum wire tensioning circuit described in an embodiment of this utility model.

[0033] Figure 5 This is a cross-sectional view of the wire-hanging component described in an embodiment of this utility model.

[0034] The components in the attached diagram are labeled as follows:

[0035] 1. Wire storage cylinder; 2. Positioning base; 3. Cutting table; 4. Upper beam; 5. Lower beam; 41. Upper wire guide wheel; 51. Lower wire guide wheel; 42. Upper eyelet; 52. Lower eyelet; 6. Upper beam wire guide tube; 7. Lower beam wire guide tube; 8. Wire guide; 9. Power unit; 81. Wire hanging component; 811. First wire threading hole; 812. Second wire threading hole; 10. Guide component; 11. Molybdenum wire. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0037] Existing automatic wire threading devices for wire EDM use molybdenum wire 11 as the main conveyor. To ensure accurate transmission of the molybdenum wire 11 to the upper beam 4 or lower beam 5, a high-precision wire guide assembly needs to be established between the upper and lower beams 4 and 5, resulting in high costs and difficulties in later installation, debugging, and maintenance. To solve the above problems, this utility model provides an automatic wire threading device for medium and large diameter wire EDM. By constructing a complete wire guiding path, the device uses a wire guide 8 as the main conveyor, guiding the molybdenum wire 11 along the entire path. The device has a simple structure, is easy to install, and has low cost.

[0038] like Figure 1As shown, the wire cutting device includes a wire storage drum 1, a positioning base 2, a cutting table 3, an upper beam 4, and a lower beam 5. The wire storage drum 1 is located on one side of the positioning base 2, and the cutting table 3 is located on the other side of the positioning base 2. The upper beam 4 and the lower beam 5 are horizontally and parallel to each other on the positioning base 2, with one end fixed to the positioning base 2 and the other free end extending horizontally above the cutting table 3. The free ends of the upper beam 4 and the lower beam 5 are respectively fixed with an upper wire guide wheel 41 and a lower wire guide wheel 51. The lower beam 5 is flush with the lower end of the wire storage drum 1. During wire cutting, the molybdenum wire 11 wound on the wire storage drum 1 needs to pass through the upper wire guide wheel 41 and the lower wire guide wheel 51 from the upper end of the wire storage drum 1 to the lower end of the wire storage drum 1 and be fixed on the wire storage drum 1, or pass through the lower wire guide wheel 51 and the upper wire guide wheel 41 from the lower end of the wire storage drum 1 to the upper end of the wire storage drum 1 and be fixed on the wire storage drum 1. In this way, the wire cutting wire threading work is completed.

[0039] like Figures 2 to 4 As shown, the automatic wire threading device for medium and large diameter wire EDM provided by this utility model includes a wire guide tube, a wire threader 8, and a power unit 9. The wire guide tube includes an upper beam wire guide tube 6 and a lower beam wire guide tube 7, which extend along the length of the upper beam 4 and lower beam 5 of the wire EDM device, respectively. Their openings near the guide wheel are positioned vertically opposite each other, and the upper beam wire guide tube 6 and lower beam wire guide tube 7 together form the complete wire threading path. The wire threader 8 has a flexible body with a diameter adapted to the inner diameter of the wire guide tube and a length greater than the length of the complete wire threading path. The power unit 9 is located near the wire storage cylinder 1 and is used to drive the wire threader 8 from the upper end of the wire storage cylinder 1 of the wire EDM device along the complete wire threading path to the lower end of the wire storage cylinder 1, and then pull the wire threader 8 back to the upper end of the wire storage cylinder 1 in the opposite direction. Driven by the power unit 9, the wire guide 8 runs along the entire wire guide path constructed by the combination of the upper beam wire guide 6 and the lower beam wire guide 7 to the lower end of the wire storage cylinder 1. Under the reverse power action of the power unit 9, the molybdenum wire 11 wound on the wire storage cylinder 1 is pulled in the opposite direction along the entire wire guide path and reset to the upper end of the wire storage cylinder 1, thus realizing automatic wire threading.

[0040] like Figure 2As shown, the upper beam wire guide tube 6 extends from near the upper end of the wire storage cylinder 1 to the free end of the upper beam. One end of the tube is bent downwards towards the wire storage cylinder 1, and the other end is bent downwards to a vertical angle around the upper guide wheel 41 of the wire cutting device. The lower beam wire guide tube 7 extends from the free end of the lower beam to near the lower end of the wire storage cylinder 1. One end of the tube is towards the wire storage cylinder 1, and the other end is bent upwards to a vertical angle around the lower guide wheel 51 of the wire cutting device. The vertical ends of the upper beam wire guide tube 6 and the lower beam wire guide tube 7 are arranged opposite each other. After the wire guide 8 passes through the upper beam wire guide tube 6, it continues to pass vertically downwards along the direction of the free end of the upper beam wire guide tube 6 until it enters the free end of the vertically arranged lower beam wire guide tube 7. It then enters the lower beam wire guide tube 7 through the free end of the lower beam wire guide tube 7 and exits through the lower beam wire guide tube 7 near the wire storage cylinder 1 under the guidance of the lower beam wire guide tube 7, completing the entire wire guide path.

[0041] The area between the free ends of the upper and lower beams of the wire EDM device is the piercing working area. The workpiece is fixed on the cutting table 3, and the position to be pierced is extended into the piercing working area. The path that the molybdenum wire 11 travels from the free end of the upper beam through the pre-made wire-piercing hole on the workpiece to the free end of the lower beam is the piercing path. The wire guide 8 also needs to pass through the piercing path during the entire wire-piercing path. To ensure that the piercing path of the wire guide 8 is consistent with the piercing path of the molybdenum wire 11, in some preferred embodiments, the end of the upper beam wire guide 6 is bent downward to a vertical angle around the upper wire guide wheel 41 of the wire EDM device and aligned with the upper eyelet 42 of the wire EDM device; the end of the lower beam wire guide 7 is bent upward to a vertical angle around the lower wire guide wheel 51 of the wire EDM device and aligned with the lower eyelet 52 of the wire EDM device. Both the upper eyelet 42 and the lower eyelet 52 of the wire EDM device have eyelet through holes through which the wire guide 8 can pass. This ensures that the perforation path of the wire guide 8 is consistent with that of the molybdenum wire 11, thereby guaranteeing that the wire guide 8 can smoothly pass through the pre-drilled wire-threading hole on the workpiece. Based on the diameter of the wire guide 8, this invention's large-diameter wire EDM automatic wire-threading device can operate on openings with a diameter identical to that of the wire guide 8; preferably, this invention's large-diameter wire EDM automatic wire-threading device can operate on openings with a minimum diameter of 6mm.

[0042] like Figure 3 As shown, in some preferred embodiments, the automatic wire threading device for medium and large diameter wire cutting further includes a guide member 10. The guide member 10 is disposed on the lower eyelet 52 of the wire cutting device and is used to guide the end of the wire guide 8, which extends downward from the upper beam wire guide 6, into the lower beam wire guide 7. The guide member 10 includes a funnel portion and a sleeve portion. The inner diameter of the sleeve portion matches the outer diameter of the lower eyelet 52, and the diameter of the funnel portion gradually increases upward from the end connected to the sleeve portion.

[0043] The main body of the wire guide 8 of this utility model is preferably a spring steel wire sheath. Since the spring steel wire sheath has both flexibility and wear resistance, as well as good deformation recovery ability, and its own weight is relatively heavier than that of ordinary pulling rope, the spring steel wire sheath is chosen as the main body of the wire guide 8. Its flexibility allows it to pass smoothly through the wire guide tube. At the same time, its good deformation recovery ability also ensures that it is not easily deformed when pulled out of the wire guide tube. Furthermore, under its own weight, it also ensures that the wire guide 8 can hang freely from the vertical opening of the upper beam wire guide tube 6 and enter the vertical opening of the lower beam wire guide tube 7.

[0044] After the wire guide 8 exits through the opening of the wire guide tube 7 near the wire storage cylinder 1 from the lower beam, the end of the molybdenum wire 11 wound around the wire storage cylinder 1 needs to be fixed to the wire hanger 81. To ensure that the molybdenum wire 11 can be conveniently and securely set on the wire hanger 81, at least two wire-passing holes with different axes can be opened on the wire hanger 81, so that the molybdenum wire 11 passes through the two wire-passing holes in sequence. Since the two wire-passing holes are not aligned, the wire body of the molybdenum wire 11 will bend during the wire-passing process and will not automatically recover. The end of the molybdenum wire bends into a hook shape, which cooperates with the wire-passing hole to form a self-locking mechanism. Therefore, the end of the molybdenum wire can be fixed to the wire guide 8 without a complex locking device. Figure 5 As shown in (a), in some preferred embodiments, the end of the wire guide 8 is provided with a first wire-passing hole 811 and a second wire-passing hole 812. Both the first wire-passing hole 811 and the second wire-passing hole 812 are perpendicular to the length direction of the wire guide 8 body and are parallel to each other. Figure 5 As shown in (b), in some preferred embodiments, the end of the wire guide 8 is provided with a first wire-passing hole 811 and a second wire-passing hole 812. The first wire-passing hole 811 is inclined from the center of the end face of the wire guide 8 and passes through the outer wall of the wire guide 8. The second wire-passing hole 812 is inclined from one side of the outer wall of the wire guide 8 to the other side of the outer wall of the wire guide 8. The included angle between the second wire-passing hole 812 and the first wire-passing hole 811 is an acute angle.

[0045] After the end of the molybdenum wire is fixed to the wire hanger 81, the wire guide 8, under the reverse force of the power unit 9, pulls the molybdenum wire 11 in the opposite direction along the entire wire guide path, passing sequentially through the lower beam 5 and upper beam 4 of the wire cutting device, and returning to the upper end of the wire storage drum 1, fixing the end of the molybdenum wire to the wire storage drum 1, thus completing the wire threading of the molybdenum wire 11. To ensure that the molybdenum wire 11 will not break due to excessive tension during subsequent wire cutting, a tension wheel assembly can be installed along the entire wire guide path to adjust the tension of the molybdenum wire 11; the molybdenum wire 11 remains taut after the tension is adjusted by the tension adjustment assembly.

[0046] During the wire cutting and drilling process, the molybdenum wire 11 remains taut at all times. Furthermore, to prevent the molybdenum wire 11 from easily breaking due to friction between the taut wire and the inner wall of the guide tube, this invention designs the guide tube to be offset relative to the tensioned position of the molybdenum wire. Additionally, the side of the guide tube facing the tensioned position has threading grooves, allowing the molybdenum wire 11 to pass through these grooves and exit the guide tube under tension, forming an independent molybdenum wire tensioning circuit. This ensures that the molybdenum wire 11 is completely detached from the guide tube within the tensioning circuit. (See Figures 2 and 3). Figure 4 As shown, in some preferred embodiments, the upper beam wire guide tube 6 is offset upward relative to the molybdenum wire tension position, and the lower beam wire guide tube 7 is offset downward relative to the molybdenum wire tension position; and the wire-passing groove of the upper beam wire guide tube 6 is opened on its lower tube wall, while the wire-passing groove of the downwardly bent tube body of the upper beam wire guide tube 6 faces the upper wire guide wheel 41. The wire-passing groove of the lower beam wire guide tube 7 is opened on its upper tube wall, while the wire-passing groove of the upwardly bent tube body of the lower beam wire guide tube 7 around the lower wire guide wheel 51 faces the upper wire guide wheel 41. Figure 4 As shown, when the molybdenum wire 11 is tensioned, the molybdenum wire 11 located in the upper beam wire guide 6 passes through the wire insertion slot from the upper beam wire guide 6 and is wound around the upper wire guide wheel 41. The molybdenum wire 11 located in the lower beam wire guide 7 passes through the wire insertion slot from the lower beam wire guide 7 and is wound around the lower wire guide wheel 51. This allows the tensioned molybdenum wire 11 to completely detach from the wire guide, avoiding the problem of the molybdenum wire 11 easily breaking due to friction with the guide during the subsequent wire cutting and hole opening process.

[0047] The power unit 9 includes two drive wheels, which are tangentially mounted on the base of the wire storage drum 1 via a mounting seat. The wire guide 8 is clamped between the two drive wheels. By driving the drive wheels to rotate forward or backward, the wire guide 8 is controlled to perform the tube-passing movement or to reset and pull the molybdenum wire 11.

[0048] The wire threading process of the automatic wire threading device for medium and large diameter wire cutting provided by this utility model is as follows:

[0049] Driven by the power unit 9, the end of the wire guide 8 with the wire hanging part 81 is inserted into the upper beam wire guide tube 6. Driven by the power unit, the wire guide 8 travels along the upper beam wire guide tube 6 to the free end of the upper beam, and then travels vertically downward along the tube body to pass through the upper eyelet 42. The wire guide 8 continues to travel downward, passes through the pre-made wire threading hole of the workpiece placed on the cutting table 3, and enters the lower beam wire guide tube 7 from the lower eyelet 52 under the guidance of the guide 10. Under the guidance of the lower beam wire guide tube 7, it bends and changes direction, and travels along the lower beam wire guide tube 7 to a position close to the lower end of the wire storage cylinder 1.

[0050] The end of the molybdenum wire wound on the wire storage drum 1 is passed sequentially through the first wire-passing hole 811, the second wire-passing hole 812, and the first wire-passing hole 811 on the wire hanging member 81 to form a winding loop, thereby locking the end of the molybdenum wire. The reverse drive power unit 9 drives the wire guide 8 to pull the molybdenum wire 11 sequentially through the lower beam wire guide tube 7, the pre-made wire-passing hole of the workpiece, and the upper beam wire guide tube 6 to the upper end of the wire storage drum 1, realizing automatic wire-passing with full-path guidance. Finally, the end of the molybdenum wire is fixed on the tightening bolt on the wire storage drum 1, completing the construction of the molybdenum wire circuit.

[0051] The molybdenum wire 11 forming the circuit is hung on the tension wheel to tighten the molybdenum wire 11. At this time, the molybdenum wire 11 located in the upper beam wire guide 6 passes through the wire insertion slot from the upper beam wire guide 6 and is wound on the upper wire guide wheel 41. The molybdenum wire 11 located in the lower beam wire guide 7 passes through the wire insertion slot from the lower beam wire guide 7 and is wound on the lower wire guide wheel 51, forming an independent molybdenum wire tensioning circuit.

[0052] The automatic wire threading device for medium and large aperture wire EDM provided by this utility model constructs a complete wire threading path through a wire guide tube. The wire guide 8 serves as the main conveyor, driven by a power unit 9, which guides the wire guide 8 along the complete wire threading path from the upper end of the wire storage cylinder 1 of the wire EDM device, sequentially winding around the upper beam 4 and lower beam 5 of the wire EDM device to the lower end of the wire storage cylinder 1. Under the action of the power unit 9, the wire guide 8 pulls the molybdenum wire 11 in the opposite direction along the complete wire threading path, resetting it to the upper end of the wire storage cylinder 1. The wire guide 8 guides the molybdenum wire 11 along the complete path, achieving automatic wire threading with complete path guidance, thus solving the problem of the molybdenum wire 11 easily deviating from the threading path in existing technologies. The automatic wire threading device for medium and large aperture wire EDM has a simple structure, is easy to install, and has extremely low manufacturing and modification costs, realizing the transformation of low-cost automatic wire threading equipment for wire EDM and greatly reducing the processing cost of automatic wire threading for wire EDM.

[0053] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. An automatic wire threading device for medium and large diameter wire cutting, characterized in that, include: The wire guide includes an upper beam wire guide (6) and a lower beam wire guide (7). The upper beam wire guide (6) and the lower beam wire guide (7) extend along the length of the upper beam (4) and lower beam (5) of the wire cutting device, respectively, and their openings near the guide wheel are arranged opposite each other. The upper beam wire guide (6) and the lower beam wire guide (7) together form the entire wire guide path. The wire guide (8) has a flexible body with a diameter that matches the inner diameter of the wire guide tube and a length that is greater than the total length of the wire path. One end of the body is provided with a wire hanging member (81). The power unit (9) is used to drive the wire guide (8) to travel from the upper end of the wire storage cylinder (1) of the wire cutting device along the entire wire guide path to the lower end of the wire storage cylinder (1), and to pull the wire guide (8) back to the upper end of the wire storage cylinder (1).

2. The automatic wire threading device for medium and large diameter wire cutting according to claim 1, characterized in that, The upper beam wire guide tube (6) extends from the upper end near the wire storage cylinder (1) to the free end of the upper beam. One end of the tube is bent downward towards the wire storage cylinder (1), and the other end is bent downward to a vertical angle by the upper guide wheel (41) of the wire cutting device. The lower beam wire guide tube (7) extends from the free end of the lower beam to the lower end near the wire storage cylinder (1). One end of the tube is bent upward to a vertical angle by the lower guide wheel (51) of the wire cutting device.

3. The automatic wire threading device for medium and large diameter wire cutting according to claim 2, characterized in that, The upper guide wheel (41) of the upper beam wire guide tube (6) is bent downward to a vertical angle and aligned with the upper eyelet (42) of the wire cutting device; the lower guide wheel (51) of the lower beam wire guide tube (7) is bent upward to a vertical angle and aligned with the lower eyelet (52) of the wire cutting device.

4. The automatic wire threading device for medium and large diameter wire cutting according to claim 1, characterized in that, The lead wire guide is offset relative to the molybdenum wire tension position, and the lead wire guide has a wire-threading groove on the side of the tube facing the molybdenum wire tension position.

5. The automatic wire threading device for medium and large diameter wire cutting according to claim 1, characterized in that, The body of the wire guide (8) is a spring steel wire sheath.

6. The automatic wire threading device for medium and large diameter wire cutting according to claim 1, characterized in that, The wire hanging member (81) has at least two wire-threading holes with different axes.

7. The automatic wire threading device for medium and large diameter wire cutting according to claim 6, characterized in that, The end of the wire guide (8) is provided with a first wire-passing hole (811) and a second wire-passing hole (812). The first wire-passing hole (811) is inclined from the center of the end face of the wire guide (8) and passes through the outer wall of the wire guide (8). The second wire-passing hole (812) is inclined from one side of the outer wall of the wire guide (8) to the other side of the outer wall of the wire guide (8). The included angle between the second wire-passing hole (812) and the first wire-passing hole (811) is an acute angle.

8. The automatic wire threading device for medium and large diameter wire cutting according to claim 1, characterized in that, The power unit (9) is located near the wire storage drum (1) and includes two tangentially arranged drive wheels, with the wire guide (8) clamped between the two drive wheels.

9. The automatic wire threading device for medium and large diameter wire cutting according to claim 1, characterized in that, The large-diameter wire cutting automatic wire threading device also includes a guide (10), which is disposed on the lower eye mold (52) of the wire cutting device and is used to guide the end of the wire threader (8) that passes downward from the upper beam wire thread guide (6) into the lower beam wire thread guide (7).

10. The automatic wire threading device for medium and large diameter wire cutting according to claim 1, characterized in that, Tension wheel assemblies are provided along the entire path of the lead wire.

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