Gantry type wire cutting numerical control machine tool

Abstract

The application relates to the technical field of numerical control machine tools, in particular to a gantry type wire cutting numerical control machine tool which comprises a machine base, an X-axis supporting plate mechanism, a mounting seat, a Y-axis moving mechanism and a wire moving mechanism are arranged on the machine base, the mounting seat is arranged at the back of the X-axis supporting plate mechanism, the Y-axis moving mechanism comprises Y-axis linear guides and a Y-axis moving frame; the Y-axis moving frame comprises a crossbeam, a connecting rod and a cantilever, the connecting rod is arranged in parallel with the Y-axis linear guides, two Y-axis linear guides are symmetrically arranged at the top end of the mounting seat, the crossbeam is arranged on the two Y-axis linear guides, through holes are arranged on the mounting seat for the connecting rod, and the crossbeam and the connecting rod are fixedly connected through the cantilever; the wire moving mechanism is arranged on the Y-axis moving frame, the Y-axis linear guides drive the Y-axis moving frame to move along the direction of the Y-axis linear guides, and then drive the wire moving mechanism to move. The Y-axis moving mechanism and the X-axis supporting plate mechanism are arranged separately, so as to solve the problem that the cross arrangement of the XY-axis moving platform affects the machining precision.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tool technology, specifically to a gantry-type wire EDM CNC machine tool. Background Technology

[0002] Electrical discharge wire cutting, often simply called "wire cutting," uses an electrode wire (such as molybdenum wire or tungsten-molybdenum wire) as a tool electrode. Under the action of a pulsed power supply, a spark discharge is generated through the tiny gap between the workpiece and the tool electrode. During this discharge process, the spark channel releases a large amount of heat energy instantaneously, causing the workpiece surface to melt or even vaporize, thereby completing the machining of the metal workpiece.

[0003] Existing wire EDM machines use an XY moving platform and a UVZ taper head device to move the electrode wire along a predetermined trajectory, thereby machining the workpiece. The XY moving platform moves the workpiece to be cut in the X and Y directions, while the UVZ taper head device moves the upper front guide wheel to adjust the angle of the electrode wire on the Z-axis when tapering the workpiece. For example, Chinese Patent CN116372294A discloses a wire EDM machine.

[0004] However, the above technical solutions have the following technical drawbacks: 1. The wire storage drum is located at the rear of the machine base, requiring the operator to go to the rear of the machine base to hang the wire, which involves walking a relatively long distance to complete the wire threading. The long wire path of the rear-mounted wire storage drum makes the electrode wire prone to vibration, affecting machining accuracy; moreover, the rear-mounted wire storage drum increases the lateral width of the machine tool, resulting in a larger space occupation. 2. The XY moving platform is arranged in a cross shape. When the X-axis and Y-axis overlap at their extreme positions, gravity causes the worktable to tilt, affecting machining accuracy. Summary of the Invention

[0005] This invention provides a gantry-type wire EDM CNC machine tool to solve the technical problems of existing machine tools where operators need to walk a long distance to thread the wire and the workpiece machining accuracy is not high.

[0006] To solve the above problems, the present invention provides a gantry-type wire EDM CNC machine tool, which adopts the following technical solution:

[0007] A gantry-type wire EDM CNC machine tool includes a base, on which are mounted an X-axis support plate mechanism, a worktable, a mounting base, a Y-axis moving mechanism, and a wire feeding mechanism. The worktable is mounted on the X-axis support plate mechanism, and the mounting base is located behind the X-axis support plate mechanism. The Y-axis moving mechanism includes a Y-axis linear guide and a Y-axis moving frame. The Y-axis moving frame includes a crossbeam, a connecting rod, and a cantilever. The connecting rod is parallel to the Y-axis linear guide. Two Y-axis linear guides are symmetrically arranged at the top of the mounting base. The mounting base has through holes for the connecting rod to pass through. The crossbeam is mounted on the two Y-axis linear guides, and the cantilever fixes the crossbeam and the connecting rod together. The wire feeding mechanism is mounted on the Y-axis moving frame and includes a lower wire guide and a wire storage cylinder. The wire storage cylinder is mounted on the crossbeam, and the lower wire guide is located at the front end of the connecting rod. The Y-axis linear guide drives the Y-axis moving frame to reciprocate along the Y-axis linear guide, thereby moving the wire feeding mechanism.

[0008] By separating the X-axis support mechanism and the Y-axis moving mechanism, the existing technology's XY-axis moving platform, with its cross-shaped arrangement, addresses the issue of table tilting due to gravity when the X and Y axes overlap at their extreme positions, thus affecting machining accuracy. The Y-axis moving mechanism replaces the table movement with a wire feeding mechanism. The Y-axis moving frame is supported by a crossbeam on two symmetrically arranged Y-axis linear guides. This structural design enhances the overall rigidity of the Y-axis moving frame, effectively preventing table tilting due to gravity and ensuring table stability during machining. The wire storage drum is positioned on the crossbeam and drives the overall wire feeding mechanism to reciprocate along the Y-axis. This design brings the wire storage drum closer to the machining area, significantly shortening the wire feeding path. The shorter path effectively reduces wire vibration during machining, improving machining accuracy. The design of the gantry-type wire storage drum being placed at the front and mounted on the crossbeam avoids the problem of increased machine tool width caused by the traditional rear-mounted wire storage drum, making the entire machine tool occupy a smaller and more compact area, suitable for use in limited spaces; at the same time, it simplifies the operation process of threading the electrode wire, eliminating the need for operators to frequently go to the back of the machine base to perform wire hanging operations, reducing tedious manual steps, and greatly improving operational convenience and work efficiency.

[0009] As a preferred embodiment of the present invention, it further includes a Z-axis lifting mechanism and a UV-axis tapered device. The UV-axis tapered device is disposed above the wire storage drum, and the Z-axis lifting mechanism is disposed above the worktable. The UV-axis tapered device is connected to the Z-axis lifting mechanism via a connector. The Y-axis linear guide rail drives the crossbeam on it to move, thereby driving the Z-axis lifting mechanism and the UV-axis tapered device to move. The UV-axis tapered device positioned above the wire storage drum fully utilizes the machine tool's spatial layout and avoids overall structural instability caused by adding extra mechanical components. Simultaneously, the connector ensures reliable connection between components, enhancing the stability of the equipment. When the Y-axis linear guide rail drives the crossbeam to move, it simultaneously drives the Z-axis lifting mechanism and the UV-axis tapered device to move as a whole. This multi-axis linkage design allows the machine tool to adjust the height and angle of the electrode wire in real time while moving in the XY plane, adapting to the processing requirements of complex workpieces.

[0010] As a preferred embodiment of the present invention, the connector is arranged in a “7” shape, with the short side of the “7”-shaped connector fixed to the top of the UV axis tapered device and the long side connected to the Z-axis lifting mechanism.

[0011] In a preferred embodiment of the present invention, the wire feeding mechanism further includes an upper wire guide, a rear upper guide roller, and a tensioning guide roller. The upper wire guide is mounted above the worktable via a Z-axis lifting mechanism. The lower wire guide is located inside the worktable and vertically below the upper wire guide. The tensioning guide roller is positioned between the rear upper guide roller and the wire storage drum to adjust the electrode wire tension. Appropriate tension adjustment can prevent fatigue damage to the electrode wire caused by excessive stretching or loosening. The presence of the tensioning guide roller allows the electrode wire to operate under optimal conditions, thereby extending its service life and reducing replacement frequency.

[0012] In a preferred embodiment of the present invention, the tensioning guide wheel is disposed outside the rotating wheel, and the rotation of the rotating wheel drives the tensioning guide wheel to rotate circumferentially. By disposing the tensioning guide wheel outside the rotating wheel and allowing it to rotate circumferentially via the rotation of the rotating wheel, dynamic adjustment of the electrode wire tension is achieved. Compared to a fixed adjustment method, dynamic adjustment better adapts to changes in electrode wire tension during processing, ensuring it remains in optimal working condition. The rotation of the rotating wheel directly drives the tensioning guide wheel to move circumferentially, providing high precision and rapid response. When processing conditions change (such as changes in material hardness or adjustments to cutting depth), the tensioning guide wheel can react quickly and adjust the electrode wire tension promptly.

[0013] As a preferred embodiment of the present invention, a slide rail is further provided below the connecting rod, and a slider is provided at the bottom end of the connecting rod for sliding connection with the slide rail; the rear end of the connecting rod is connected to the crossbeam via a cantilever. The sliding connection between the slider and the slide rail ensures the smoothness of the connecting rod's movement and reduces errors caused by mechanical vibration or friction. Especially when the electrode wire needs to undergo tapered cutting or other high-precision machining, this smooth sliding connection can significantly improve machining accuracy.

[0014] As a preferred embodiment of the present invention, the X-axis support plate mechanism includes an X-axis linear guide, an X-axis linear motor, and a support plate. The support plate is disposed on two X-axis linear guides. The X-axis linear guides and the X-axis linear motor are horizontally disposed on the front end table of the machine base. The X-axis linear motor is disposed between the two X-axis linear guides.

[0015] As a preferred embodiment of the present invention, the pallet has an inverted frustum structure with multiple perforations. This design significantly reduces the pallet's weight. The lighter pallet reduces the influence of inertial forces during X-axis movement, thereby improving smoothness and response speed during acceleration and deceleration. The perforated design increases the contact area between the pallet surface and the air, facilitating rapid heat dissipation during processing.

[0016] As a preferred embodiment of the present invention, a baffle is provided at the edge of the worktable. The baffle prevents chips generated during machining from splashing outside the machine tool.

[0017] In a preferred embodiment of the present invention, the baffle is disposed on the outer edge of the support plate and extends to the worktable, and the baffles on both sides of the worktable are automatically raised and lowered. The baffles on the outer edge of the support plate, extending their height to the worktable, effectively prevent chips generated during processing from splashing outside the machine tool. Especially in high-speed wire EDM machining scenarios, this protective measure not only protects other components of the equipment but also ensures the safety of the operator. The baffles on both sides of the worktable are automatically raised and lowered; after cutting, the baffles automatically return to their lowest position (flush with the worktable) to avoid interfering with workpiece disassembly.

[0018] The beneficial effects are:

[0019] This invention employs a gantry-type front-mounted wire storage drum structure, solving the problems of insufficient rigidity caused by excessively long cantilever arms and vibration caused by excessively long wire feed in existing machine tools. The front-mounted wire storage drum shortens the wire feed path, significantly reducing the distance the electrode wire travels from the drum to the machining area, thus reducing vibration and wire stacking caused by excessive wire feed, effectively improving workpiece machining accuracy and surface finish. Simultaneously, with the wire storage drum located at the front and top, operators do not need to go to the back of the machine to hang the wire or move around to complete the electrode wire threading (manual front threading; after manually threading the wire through the workpiece, it is directly attached to the wire storage drum to complete the threading), making it quick and convenient, reducing the overall machine size and floor space required. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram (with cabinet) of a gantry-type wire EDM CNC machine tool;

[0021] Figure 2 for Figure 1 A structural diagram with some cabinet doors removed;

[0022] Figure 3 This is a schematic diagram of the CNC machine tool of the present invention without the cabinet;

[0023] Figure 4 for Figure 3 The right view;

[0024] Figure 5 This is a schematic diagram of a structure containing a wire feeding mechanism.

[0025] Explanation of reference numerals in the attached figures:

[0026] 11. X-axis linear guide; 12. X-axis linear motor; 13. Support plate; 2. Worktable; 3. Mounting base; 41. Y-axis linear guide; 42. Crossbeam; 43. Connecting rod; 44. Cantilever; 5. Z-axis lifting mechanism; 6. UV-axis taper device; 71. Wire storage drum; 72. Upper wire guide; 73. Lower wire guide; 74. Tensioning guide roller; 75. Rear lower guide roller; 8. Connecting parts. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] Existing wire EDM CNC machine tools typically employ a cross-overlapping structure for their XY-axis support mechanisms. When the worktable is located at the overlapping position at the XY-axis ends, the excessive weight of the support plate and worktable causes unevenness, leading to workpiece tilting and affecting machining accuracy. This invention solves the aforementioned problem by placing the Y-axis moving mechanism on the top of the machine base, separate from the X-axis support mechanism.

[0029] After introducing the basic principles of the present invention, various non-limiting embodiments of the present invention are described in detail below. Any number of elements in the accompanying drawings is for illustrative purposes only and not for limitation, and any naming is for distinction only and has no limiting meaning.

[0030] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0031] Example 1:

[0032] like Figure 1-5 The diagram shows a gantry-type wire EDM CNC machine tool, housed within a cabinet. It includes a base, on which are mounted an X-axis support plate 13 mechanism, a worktable 2, a mounting base 3, a Y-axis moving mechanism, a wire feeding mechanism, a Z-axis lifting mechanism 5, and a UV-axis taper device 6. The worktable 2 is mounted on the X-axis support plate 13 mechanism, and the mounting base 3 is positioned behind it. The Y-axis moving mechanism includes a Y-axis linear guide 41 and a crossbeam 42. The Y-axis linear guide 41 is mounted on the mounting base 3, and the crossbeam 42 is supported on the Y-axis linear guide 41. The wire feeding mechanism includes an upper wire guide 72, a lower wire guide 73, and a wire spool 71. The upper wire guide 72 is positioned above the worktable 2 via the Z-axis lifting mechanism 5. The lower wire guide 73 is located within the worktable 2 and vertically below the upper wire guide 72. The wire spool 71 is mounted on the crossbeam 42. The UV-axis taper device 6 is mounted on the wire spool 71. The Z-axis lifting mechanism 5 is fixedly connected to the UV-axis tapered device 6 via a connector 8. In this embodiment, the X-axis is the left-right direction, and the Y-axis is the front-back direction.

[0033] Placing CNC machine tools inside a cabinet effectively improves machine tool rigidity, reduces vibration, and improves stripe patterns.

[0034] like Figure 3 As shown, the X-axis support plate 13 mechanism includes an X-axis linear guide rail 11, an X-axis linear motor 12, and a support plate 13. The X-axis linear guide rail 11 and the X-axis linear motor 12 are horizontally arranged on the front end of the machine base, with the X-axis linear motor 12 positioned between the two X-axis linear guide rails 11. The support plate 13 is mounted on the two X-axis linear guide rails 11, and multiple sliders are provided at the bottom of the support plate 13 to slide and connect with the guide rails. The support plate 13 has an inverted truncated pyramid structure, with multiple hollowed-out areas at the bottom and multiple reinforcing ribs at the bottom to enhance its structural rigidity and strength.

[0035] The worktable 2 is fixedly mounted on the pallet 13 and is used to clamp and fix the workpiece.

[0036] Mounting base 3 is located on the machine base table and behind the X-axis support plate 13 mechanism. Mounting base 3 has a through hole for the sliding assembly to pass through. The sliding assembly is set on the extended plane of the upper surface of the support plate 13. The sliding assembly includes a connecting rod 43, a slider, and a slide rail. The slider is fixedly installed at the bottom end of the connecting rod 43, and the slide rail is installed below the connecting rod 43. The slider is slidably connected to the slide rail, and the slider can move back and forth on the slide rail, thereby driving the connecting rod 43 to move back and forth.

[0037] The Y-axis moving mechanism includes a Y-axis linear guide 41, a Y-axis moving frame, and a Y-axis drive assembly. The Y-axis moving frame includes a crossbeam 42, a connecting rod 43, and a cantilever 44. Two Y-axis linear guides 41 are symmetrically arranged on the left and right sides of the mounting base 3. The crossbeam 42 is mounted on the Y-axis linear guides 41 (i.e., the crossbeam 42 is mounted on the two Y-axis linear guides 41 in a plate-bridge structure). A lower wire guide 73 is provided at the front end of the connecting rod 43, and the lower wire guide 73 is located inside the worktable 2; the rear end of the connecting rod 43 is connected to the crossbeam 42 through the cantilever 44, which fixes the connecting rod 43 and the crossbeam 42 together. The Y-axis drive assembly drives the Y-axis linear guide 41 to reciprocate, thereby driving the crossbeam 42 (i.e., the Y-axis moving frame) to move along the Y-axis linear guide 41.

[0038] like Figure 5 As shown, the wire feeding mechanism includes a wire storage drum 71, an upper wire guide 72, a lower wire guide 73, a tensioning guide roller 74, a rear upper guide roller, and a rear lower guide roller 75. The electrode wire starts from the wire storage drum 71, passes through the upper wire guide 72, the lower wire guide 73, the rear lower guide roller 75, the rear upper guide roller, and the tensioning guide roller 74 in sequence, and then returns to the wire storage drum 71 to complete the cycle. The tensioning guide roller 74 is located on one side of the rotating wheel. The rotation of the rotating wheel drives the tensioning guide roller 74 to move along the circumference of the rotating wheel. The tensioning guide roller 74 can adjust the tension of the electrode wire in real time to ensure that the electrode wire maintains a constant tension during the cutting process and avoids wire breakage or a decrease in cutting accuracy due to slack.

[0039] The wire storage drum 71 is mounted on the crossbeam 42 and fixed to the Y-axis linear guide rail 41 via a gantry bridge connection. A cantilever 44 connects the crossbeam 42 and the connecting rod 43 to form a high-strength rigid moving frame. The radial force generated by the wire storage drum 71 during operation is transmitted to the machine base via the Y-axis linear guide rail 41, while the axial force is transferred from the cantilever 44 to the connecting rod 43, thus solving the technical problem of resonance in the machine tool due to the front-mounted wire storage drum 71. The wire storage drum 71 rotates on the crossbeam 42 to feed the wire. The Y-axis moving frame drives the wire feeding mechanism to cooperate with the X-axis support plate 13 mechanism to process and cut the workpiece contour. A lead screw and drive mechanism are located below the wire storage drum 71. The drive mechanism drives the lead screw to move, thereby moving the wire storage drum 71 left and right.

[0040] The Z-axis lifting mechanism 5 includes a Z-axis lifting assembly, which is located at the front end of the wire storage drum 71. The lower end of the Z-axis lifting assembly is connected to the upper wire guide 72. The Z-axis lifting assembly drives the upper wire guide 72 to move up and down along the Z-axis slide rail, adjusting the height of the upper wire guide 72 to accommodate workpieces of different thicknesses. The UV axis taper device 6 controls the lateral offset of the upper wire guide 72 to achieve taper cutting.

[0041] The UV-axis tapered device 6 is positioned above the wire storage drum 71. The UV-axis tapered device 6 is separate from the wire storage drum 71, ensuring that the mechanical vibration generated by the high-speed reversal of the wire storage drum 71 does not affect the UV-axis tapered device 6, thus avoiding a "wavy" defect on the tapered cutting surface. A "7"-shaped connector 8 is located at the top of the UV-axis tapered device 6, and the Z-axis lifting mechanism 5 is positioned on the long side of the "7"-shaped connector 8. The short side of the "7"-shaped connector 8 is fixedly connected to the top of the UV-axis tapered device 6. The "7"-shaped connector 8 prevents direct contact between the UV and Z axes and the wire storage drum 71, thus preventing vibration of the wire storage drum 71 from affecting the UV and Z axes.

[0042] The UV-axis tapering device 6 includes a U-axis worktable and a V-axis worktable, which drive the Z-axis lifting mechanism 5 to move. The movement direction of the U-axis worktable is parallel to the movement direction of the X-axis linear guide 11, and the movement direction of the V-axis worktable is parallel to the movement direction of the Y-axis linear guide 41. The U-axis and V-axis worktables achieve precise lateral movement through ball screws and linear guides, respectively. The ball screws are driven by independent servo motors to ensure that the offset of the upper wire guide 72 in the lateral plane can be precisely adjusted according to the workpiece taper requirements.

[0043] Working principle: Fix the workpiece to be processed on the worktable, adjust the Z-axis height, pass the electrode wire through the workpiece hole (or cut in from the edge), and then fix it directly on the front wire storage drum.

[0044] Input the machining path to the industrial control computer. The industrial control computer automatically recognizes the path and sends it to the X-axis drive motor and Y-axis drive motor. The X-axis drive motor drives the worktable to move along the X-axis, thereby moving the workpiece. The Y-axis drive motor drives the wire feeding mechanism to move instead of moving the workpiece. The contour is cut by electrode wire discharge. If taper is required, the UV axis taper device will synchronously offset the upper wire guide.

[0045] Example 2:

[0046] Its main difference from Example 1 is:

[0047] In this embodiment, a baffle is provided around the worktable to prevent chips generated during processing from splashing outside the machine tool.

[0048] A baffle is located on the outer edge of the pallet and extends to the worktable, preventing injury from flying debris during processing. The baffles on both sides of the worktable can automatically rise and fall. After cutting, the baffle automatically returns to its lowest position (flush with the worktable) to avoid interfering with workpiece disassembly. Ball screws are installed parallel to each other at the upper and lower ends of the rear baffle of the worktable. The lower ball screw is connected to a servo motor via a coupling. Synchronous pulleys are installed at the ends of the upper and lower ball screws. Two synchronous pulleys on the same side are connected by a synchronous belt to achieve synchronous rising and falling of the left and right baffles. Slider blocks are fixedly installed at the ends of the left and right baffles, allowing the baffles to slide along baffle lifting guide rails. These guide rails are located on the left and right sides of the rear baffle and are parallel to the Z-axis. The sliders are connected to synchronous belt clamps via bolts, and the synchronous belt clamps are fixed to the synchronous belt, thus enabling the synchronous belt to drive the sliders to move up and down along the baffle lifting guide rails.

[0049] Based on the above description in this specification, those skilled in the art will also understand that the following terms, such as "upper," "lower," "left," "right," "front," and "rear," which indicate orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as a limitation on the present invention.

Claims

1. A gantry-type wire EDM CNC machine tool, comprising a machine base, on which an X-axis support plate mechanism, a worktable, a mounting base, a Y-axis moving mechanism, and a wire feeding mechanism are disposed, wherein the worktable is disposed on the X-axis support plate mechanism, characterized in that, The mounting base is located behind the X-axis support plate mechanism. The Y-axis moving mechanism includes a Y-axis linear guide rail and a Y-axis moving frame. The Y-axis moving frame includes a crossbeam, a connecting rod, and a cantilever. The connecting rod is arranged parallel to the Y-axis linear guide rail. Two Y-axis linear guide rails are symmetrically arranged at the top of the mounting base. The mounting base has through holes for the connecting rod to pass through. The crossbeam is mounted on the two Y-axis linear guide rails. The cantilever fixes the crossbeam and the connecting rod together. The wire feeding mechanism is mounted on the Y-axis moving frame. The wire feeding mechanism includes a lower wire guide and a wire storage cylinder. The wire storage cylinder is mounted on the crossbeam, and the lower wire guide is located at the front end of the connecting rod. The Y-axis linear guide rail drives the Y-axis moving frame to reciprocate along the Y-axis linear guide rail direction, thereby driving the wire feeding mechanism to move. A slide rail is also provided below the connecting rod, and a slider is provided at the bottom end of the connecting rod for sliding connection with the slide rail. The rear end of the connecting rod is connected to the crossbeam via a cantilever.

2. The gantry-type wire EDM CNC machine tool as described in claim 1, characterized in that, It also includes a Z-axis lifting mechanism and a UV-axis tapered device. The UV-axis tapered device is located above the wire storage drum, and the Z-axis lifting mechanism is located above the worktable. The UV-axis tapered device is connected to the Z-axis lifting mechanism through a connector. The Y-axis linear guide rail drives the crossbeam on it to move, thereby driving the Z-axis lifting mechanism and the UV-axis tapered device to move.

3. A gantry-type wire EDM CNC machine tool as described in claim 2, characterized in that, The connector is arranged in a "7" shape. The short side of the "7" shaped connector is fixed to the top of the UV axis tapered device, and the long side is connected to the Z axis lifting mechanism.

4. The gantry-type wire EDM CNC machine tool as described in claim 1, characterized in that, The wire feeding mechanism also includes an upper wire guide, a rear upper guide roller, and a tensioning guide roller. The upper wire guide is set above the worktable via a Z-axis lifting mechanism. The lower wire guide is set inside the worktable and located vertically below the upper wire guide. The tensioning guide roller is set between the rear upper guide roller and the wire storage cylinder to adjust the tension of the electrode wire.

5. A gantry-type wire EDM CNC machine tool as described in claim 4, characterized in that, The tensioning guide wheel is located outside the rotating wheel, and the rotation of the rotating wheel drives the tensioning guide wheel to rotate in the circumferential direction of the rotating wheel.

6. A gantry-type wire EDM CNC machine tool as described in claim 1, characterized in that, The X-axis support plate mechanism includes an X-axis linear guide, an X-axis linear motor, and a support plate. The support plate is set on two X-axis linear guides. The X-axis linear guides and the X-axis linear motor are horizontally arranged on the front end table of the machine base. The X-axis linear motor is located between the two X-axis linear guides.

7. A gantry-type wire EDM CNC machine tool as described in claim 6, characterized in that, The tray has an inverted truncated pyramid structure and multiple cutouts.

8. A gantry-type wire EDM CNC machine tool as described in claim 7, characterized in that, The edge of the workbench is provided with a baffle.

9. A gantry-type wire EDM CNC machine tool as described in claim 8, characterized in that, The baffle is located on the outer edge of the tray and extends to the worktable. The baffles on the left and right sides of the worktable can be automatically raised and lowered.

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