A numerically controlled wire cutting machine and its automatic wire threading method

Abstract

The present invention relates to a numerically controlled wire cutting processing device and an automatic wire threading method thereof. The structure includes a machine frame, on which a wire spool, a receiving frame, and a conductive workbench are arranged. The wire spool is movably arranged on the machine frame, and an electrode wire is wound thereon. On the receiving frame, an upper wire guide device and a lower wire guide device for the electrode wire to travel are arranged. The conductive workbench is insulated from the machine frame and is located between the upper wire guide device and the lower wire guide device. The upper wire guide device and the lower wire guide device are respectively movably arranged on the receiving frame, and / or the conductive workbench is movably arranged on the machine frame. On the upper wire guide device or the lower wire guide device, a ferrule device for storing and automatically pushing a ferrule and a wire cutting and connecting device for cutting and connecting the electrode wire are arranged. This structure can achieve multiple angle conversions and cyclic wiring and wire threading operations, and can also perform complex automatic processing operations when unattended, improving the processing accuracy and having strong practicability.

Description

Technical Field

[0001] The present invention relates to a numerically controlled wire cutting machine and an automatic wire threading method thereof. Background Art

[0002] Numerical control wire cutting is a branch of electric discharge machining, which uses a wire electrode (molybdenum wire, copper wire, galvanized wire) to cut the workpiece by spark discharge. In numerical control wire cutting, the relative movement of the workpiece and the electrode wire is controlled by digital information, and it is often used to process high-hardness materials, microstructures, complex shapes, high-precision dimensional parts, and high-surface-quality parts.

[0003] Numerical control wire cutting machines are usually divided into three categories: high-speed wire cutting machines, medium-speed wire cutting machines, and slow-speed wire cutting machines; taking the high-speed wire cutting machine as an example, the electrode wire moves at a high speed back and forth, and the wire feeding speed is 8m / s - 10m / s. Its working principle is: the electrode wire passes through a small hole pre-drilled on the workpiece, and is driven by the wire spool to move back and forth alternately through the guide wheel. The workpiece is installed on the conductive workbench through an insulating plate, and the conductive workbench moves in the X and Y coordinate directions in the horizontal plane according to the given control program respectively to synthesize any plane curve trajectory. The pulse power supply applies a pulse voltage to the electrode wire and the workpiece. The electrode wire is connected to the negative pole of the pulse power supply, and the workpiece is connected to the positive pole of the pulse power supply. When an electric pulse comes, a spark discharge occurs between the electrode wire and the workpiece. The central temperature in the discharge channel can instantaneously reach above 10,000°C. The high temperature melts the workpiece metal, and even a small amount of it vaporizes. The high temperature also vaporizes part of the working fluid between the electrode wire and the workpiece. These vaporized working fluids and metal vapors instantaneously expand rapidly and have the characteristics of explosion. This thermal expansion and local micro-explosion eject the melted and vaporized metal materials to achieve electrical erosion cutting of the workpiece material.

[0004] In view of the above structure, the current numerically controlled wire cutting machines all require manual wire threading, which requires professional operation and has a complex process. During the wire cutting process, if other cuts need to be made on the same workpiece, the staff needs to stay on duty. After waiting for one position to be cut, manual wire threading is required, and then the next round of cutting is completed. Its production efficiency is low and the processing cost is high.

[0005] Therefore, it is necessary to further improve. Summary of the Invention

[0006] The purpose of the present invention is to provide a numerically controlled wire cutting machine and an automatic wire threading method thereof to overcome the deficiencies in the prior art.

[0007] A numerically controlled wire cutting machine designed according to this purpose includes a frame, and is characterized in that: a wire spool, a receiving frame, and a conductive workbench are arranged on the frame.

[0008] The wire spool is movably arranged on the frame, and the electrode wire is wound thereon.

[0009] On the receiving frame, there are an upper wire guiding device and a lower wire guiding device for the electrode wire to pass through.

[0010] The conductive workbench is insulated from the frame and is located between the upper wire guiding device and the lower wire guiding device.

[0011] The upper wire guiding device and the lower wire guiding device are respectively movably arranged on the receiving frame, and / or the conductive workbench is movably arranged on the frame.

[0012] On the upper wire guiding device or the lower wire guiding device, there is a ferrule device for storing and automatically pushing the ferrule, and a wire cutting and connecting device for cutting and connecting the electrode wire.

[0013] On the frame, there is a wire spool frame which slides back and forth on the frame; the wire spool rotates reciprocally on the wire spool frame, and there is a groove for collecting the electrode wire and / or the ferrule thereon.

[0014] The lower wire guiding device includes a lower X-axis seat, a lower Y-axis seat, and a lower Z-axis seat.

[0015] There is a guiding left-right sliding fit between the lower X-axis seat and the lower Y-axis seat.

[0016] There is a guiding up-down sliding fit between the lower Y-axis seat and the lower Z-axis seat.

[0017] There is a guiding front-back sliding fit between the lower Z-axis seat and the receiving frame.

[0018] On the lower X-axis seat, there are also a lower traction wheel set and a lower wire guiding wheel set; the lower wire guiding wheel set is arranged at the outer end of the lower X-axis seat; the lower X-axis seat is provided with a lower clamp and a lower wire driving device corresponding to the lower wire guiding wheel set; there is also a lower wire winding and unwinding buffer set between the lower traction wheel set and the lower wire guiding wheel set; a lower wire tension detector is also arranged on the lower traction wheel set, the lower wire guiding wheel set, or the lower wire winding and unwinding buffer set.

[0019] The upper wire guiding device includes an upper X-axis seat, an upper Y-axis seat, and an upper Z-axis seat.

[0020] There is a guiding left-right sliding fit between the upper X-axis seat and the upper Y-axis seat.

[0021] There is a guiding up-down sliding fit between the upper Y-axis seat and the upper Z-axis seat.

[0022] There is a guiding front-back sliding fit between the upper Z-axis seat and the receiving frame.

[0023] On the upper rack X-axis seat, an upper traction wheel group and an upper wire guiding wheel group are also provided; the upper wire guiding wheel group is arranged at the outer end of the upper rack X-axis seat; the upper rack X-axis seat is provided with an upper clamp and an upper wire driver corresponding to the upper wire guiding wheel group; an upper wire take-up and pay-out buffer group is also arranged between the upper traction wheel group and the upper wire guiding wheel group; an upper wire tension detector is also arranged on the upper traction wheel group, the upper wire guiding wheel group, or the upper wire take-up and pay-out buffer group.

[0024] The connecting sleeve device includes a connecting sleeve frame, a connecting sleeve register, and a pusher; the connecting sleeve frame is movably arranged on the upper wire rack device; the connecting sleeve register is detachably installed on the connecting sleeve frame, and a plurality of connecting sleeves are stored thereon; the pusher is movably arranged on the connecting sleeve register, and when moving, pushes the plurality of connecting sleeves one by one to the connecting port of the connecting sleeve register.

[0025] The wire cutting and connecting device includes a wire cutting and connecting frame and a wire cutting and connecting tool; the wire cutting and connecting frame is movably arranged on the upper wire rack device; the wire cutting and connecting tool is a pneumatic cutting pliers and is arranged on the wire cutting and connecting frame, and moves along with the wire cutting and connecting frame and is close to the connecting port of the connecting sleeve device.

[0026] The wire cutting and connecting tool is provided with a scissors position and a pliers position.

[0027] The wire cutting and connecting tool cuts the electrode wire through the scissors position.

[0028] The wire cutting and connecting tool clamps the connecting sleeve through the pliers position to realize the connection of the two electrode wire ends located in the connecting sleeve.

[0029] A drill bit is also provided on the upper wire rack device or the lower wire rack device.

[0030] An automatic wire threading method for a numerically controlled wire cutting machine, characterized in that: taking the original positions of the upper traction wheel group and the lower traction wheel group as the positioning coordinate axes of the wire guiding shaft, the system can control the upper traction wheel group and the lower traction wheel group to move at any point within the set stroke range;

[0031] When it is necessary to transfer the electrode wire from one processing hole to another, start the upper and lower clamps to fix the electrode wire on both the upper and lower sides of the conductive workbench, maintain the tension of the electrode wire on the wire reel, start the connecting sleeve device to cut the electrode wire on both the upper and lower sides of the conductive workbench to form an opening, and the lower traction wheel group rotates in reverse to retract the electrode wire without tension and keep the electrode wire break near the port of the lower clamp; then, the upper wire frame device and the lower wire frame device slide back and forth and left and right respectively, or the conductive workbench drives the workpiece to slide back and forth and left and right; until the electrode wire on the upper wire frame device is aligned above the working wire threading hole, and the electrode wire on the lower wire frame device is aligned below the working wire threading hole. At this time, the lower wire frame device moves along the Y-axis direction to approach the workpiece and makes the electrode wire break on it face the working wire threading hole directly. The lower traction wheel group rotates forward, and at the same time, the lower wire take-up and buffer group pays out wire and exports the electrode wire, which passes through the workpiece and penetrates into the connecting sleeve. Moreover, the upper traction wheel group rotates forward, and at the same time, the upper wire take-up and buffer group pays out wire and exports the electrode wire, which passes through the workpiece and penetrates into the connecting sleeve; start the connecting sleeve device to connect the two electrode wire breaks, release the upper and lower clamps, and the wire reel stores the electrode wire with the connecting sleeve in the groove. During the subsequent reciprocating wire cutting processing, the electrode wire section with the connecting sleeve is set as the non-working section; during the working process, the upper wire frame device and the lower wire frame device can be aligned or offset, so that the workpiece can process tapered surfaces, straight holes, and curved surfaces at irregular angles.

[0032] Through the improvement of the above structure, the present invention has the following advantages compared with the prior art:

[0033] 1. The wire reel can rotate and slide back and forth relative to the machine frame, effectively avoiding the problems of uneven winding, accumulation, and contact friction with the machine frame or the wire reel frame during the take-up and pay-out of the electrode wire and / or the connecting sleeve, which may cause damage to the electrode wire and / or the connecting sleeve, so that the electrode wire and / or the connecting sleeve can be evenly distributed on the wire reel.

[0034] 2. The lower X-axis seat of the lower wire frame provided with the lower traction wheel group and the lower wire guiding wheel group can slide left and right, up and down, and back and forth relative to the conductive workbench on the machine frame, enabling the electrode wire located on the lower wire frame device to be as close to and aligned with the workpiece wire threading hole of the conductive workbench as possible during wire threading, thereby improving the wire threading and connection accuracy of the electrode wire, ensuring the wire threading quality of the electrode wire, and avoiding the problem of electrode wire breakage during work.

[0035] 3. The upper X-axis seat of the upper wire frame provided with the upper traction wheel group, the upper wire guiding wheel group, the connecting sleeve device, and the wire cutting and connecting device can slide left and right, up and down, and back and forth relative to the conductive workbench on the machine frame, enabling the electrode wire located on the upper wire frame device to be as close to and aligned with the workpiece wire threading hole of the conductive workbench as possible during wire threading, thereby improving the wire threading and connection accuracy of the electrode wire, ensuring the wire threading quality of the electrode wire, and avoiding the problem of electrode wire breakage during work.

[0036] 4. The connecting sleeve device can store a number of connecting sleeves, facilitating the CNC wire cutting machine to hold multiple connecting sleeves to complete the continuous connection of the electrode wire, improving production efficiency. At the same time, the wire cutting and connecting device can cut the electrode wire and cooperate with the connecting sleeve device to connect two disconnected electrode wires. Furthermore, the entire upper wire rack device can achieve the wire movement, disconnection, and connection of the electrode wire to meet the continuous processing requirements of the CNC wire cutting machine.

[0037] 5. While the drill bit can move left and right, up and down, and back and forth following the upper wire rack device or the lower wire rack device, it can also drill holes in the workpiece placed on the conductive workbench. This allows the workpiece to be placed on the conductive workbench without pre-drilling, improving the convenience and efficiency of workpiece cutting. Moreover, it enables the two disconnected electrode wires to quickly and accurately find the orientation of the wire threading hole in the workpiece during connection, enhancing the connection efficiency of the electrode wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0040] Figures 1-3 Schematic perspective view of an embodiment of the present invention.

[0041] Figure 4 Schematic front view of an embodiment of the present invention.

[0042] Figure 5 Schematic top view of an embodiment of the present invention.

[0043] Figure 6 、 Figure 7 Schematic assembly structure view of the receiving frame, upper wire rack device, connecting sleeve device, and wire cutting and connecting device.

[0044] Figure 8 、 Figure 9 Schematic exploded structure view of the receiving frame, upper wire rack device, connecting sleeve device, and wire cutting and connecting device.

[0045] Figure 10 、 Figure 11 Schematic assembly structure view of the receiving frame and lower wire rack device.

[0046] Figure 12 and Figure 13 are schematic diagrams of the decomposition structure of the support frame and the wire-off frame device.

[0047] Figure 14 and Figure 15 are schematic diagrams of the partially enlarged assembly structure of the wire-on frame device, the connection sleeve device, and the wire cutting and splicing device.

[0048] Figure 16 and Figure 17 are schematic diagrams of the partially enlarged decomposition structure of the wire-on frame device, the connection sleeve device, and the wire cutting and splicing device.

[0049] Figure 18 are schematic diagrams of the sectional assembly structure of the connection sleeve device and the wire cutting and splicing device.

[0050] Figure 19 and Figure 20 are schematic diagrams of the decomposition structure of the connection sleeve device. Detailed implementation manners

[0051] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0052] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0053] Refer to Figures 1-20 , this numerically controlled wire cutting processing equipment includes a frame 1, on which a wire spool 3, a support frame 11, and a conductive workbench (not shown in the figure, with a workpiece 29 arranged above it, and the conductive workbench is similar to a frame shape) are arranged.

[0054] The wire spool 3 is movably arranged on the frame 1, and an electrode wire 5 is wound and unwound thereon.

[0055] On the support frame 11, a wire-on frame device A and a wire-off frame device B for the electrode wire 5 to travel are arranged.

[0056] The conductive workbench is insulated from the frame 1 and is located between the wire-on frame device A and the wire-off frame device B.

[0057] The wire-on frame device A and the wire-off frame device B are respectively movably arranged on the support frame 11, and / or the conductive workbench is movably arranged on the frame 1. That is, the wire-on frame device A, the wire-off frame device B, and the conductive workbench can achieve mutual movable cooperation.

[0058] On the loading rack device A or the unloading rack device B, there is a ferrule device C for storing and automatically pushing the ferrule 34, and a wire cutting and connecting device D for cutting and connecting the electrode wire 5.

[0059] Specifically, a wire spool rack 2 is provided on the frame 1, and the wire spool rack 2 slides back and forth on the frame 1; the wire spool 3 rotates reciprocally on the wire spool rack 2, and a groove 6 for collecting the electrode wire 5 and / or the ferrule 34 is provided thereon.

[0060] The wire spool rack 2 is provided on the frame 1, and a wire spool rack driving device is provided between the two; the wire spool rack 2 slides back and forth on the frame 1 by the drive of the wire spool rack driving device; a wire spool driving device 4 is provided between the wire spool 3 and the wire spool rack 2; the wire spool 3 rotates reciprocally on the wire spool rack 2 by the wire spool driving device 4.

[0061] In this embodiment, by the driving action of the wire spool driving device 4, the wire spool 3 can rotate reciprocally on the wire spool rack 2. At the same time, by the driving action of the wire spool rack driving device, the wire spool rack 2 can slide back and forth on the frame 1, so that finally the wire spool 3 can rotate and slide back and forth relative to the frame 1, effectively avoiding the problems that the electrode wire 5 and / or the ferrule 34 are unevenly wound and stacked together during winding and unwinding, and contacting and rubbing with the frame 1 or the wire spool rack 2, resulting in damage to the electrode wire 5 and / or the ferrule 34, so that the electrode wire 5 and / or the ferrule 34 can be evenly distributed on the wire spool 3.

[0062] Since the wire spool rack 2 can slide back and forth on the frame 1, the electrode wire 5 can be collected on the wire spool 3, and the ferrule 34 can be collected on the groove 6.

[0063] The ferrule 34 can be used to connect two disconnected electrode wires 5. After the ferrule 34 is used, it needs to be collected. At the same time, when the ferrule 34 is in use, its surface is higher than the surface of the electrode wire 5. Therefore, collecting the ferrule 34 on the groove 6 can avoid affecting the winding of the electrode wire 5 and ensure that the electrode wire 5 can be smoothly wound and unwound on the wire spool 3.

[0064] The groove 6 is located at the end or middle position of the wire spool 3, and is recessed annularly along the outer circumference of the wire spool 3, or recessed at any position on the surface of the wire spool 3. That is, the groove 6 can be annularly recessed at any position on the outer circumference of the wire spool 3, or can be recessed at any position on the surface of the wire spool 3.

[0065] In this embodiment, preferably, the groove 6 is annularly recessed along the outer circumference of one end of the wire spool 3, which is not only convenient for more electrode wires 5 to be wound, but also can avoid the interference of the ferrule 34 on the electrode wire 5 during collection.

[0066] Furthermore, limiting portions 7 for limiting the winding positions of the electrode wire 5 and / or the connection sleeve 34 are respectively provided at both ends of the wire cylinder 3. The limiting portion 7 can limit the winding positions of the electrode wire 5 and the connection sleeve 34 to avoid the problem that the electrode wire 5 and the connection sleeve 34 are disengaged from the wire cylinder 3 due to lack of limitation during collection, thereby improving the collection stability of the wire cylinder 3 for the electrode wire 5 and the connection sleeve 34.

[0067] To improve the rotational stability of the wire cylinder 3, bearing seats 8 are respectively provided at both ends of the wire cylinder 3, and the wire cylinder 3 is respectively rotatably mounted on the wire cylinder frame 2 through the bearing seats 8. The wire cylinder driving device 4 is fixedly arranged on the wire cylinder frame 2, and its power output end is drivingly connected to one end of the wire cylinder 3. The wire cylinder 3 can reciprocally rotate on the wire cylinder frame 2 through the cooperation of the wire cylinder driving device 4 and the bearing seats 8, and its rotation direction is as Figure 3 shown by the arrow.

[0068] To enable the wire cylinder frame 2 to stably and smoothly slide on the machine frame 1, a wire cylinder frame Z-axis guide rail 9 is provided between the wire cylinder frame 2 and the machine frame 1; the wire cylinder frame 2 is reciprocally slidably guided on the machine frame 1 through the wire cylinder frame Z-axis guide rail 9.

[0069] Furthermore, the wire cylinder frame Z-axis guide rail 9 is horizontally fixedly arranged on the machine frame 1; a wire cylinder frame Z-axis slider 10 is provided on the wire cylinder frame 2 and is guidingly engaged with the wire cylinder frame Z-axis guide rail 9. In this embodiment, preferably, the wire cylinder frame Z-axis guide rail 9 is fixedly arranged on the machine frame 1 in the front-back direction, so that the wire cylinder frame 2 can slide back and forth on the machine frame 1 through the cooperation of the wire cylinder frame Z-axis guide rail 9 and the wire cylinder frame Z-axis slider 10.

[0070] The wire cylinder frame driving device and the wire cylinder driving device 4 are servo driving motors or pneumatic drivers. In this embodiment, the wire cylinder frame driving device and the wire cylinder driving device 4 preferably adopt servo driving motors.

[0071] In this embodiment, a ball screw bearing is provided between the wire cylinder frame 2 and the machine frame 1, and the wire cylinder frame driving device is cooperated with the ball screw bearing to drive the wire cylinder frame 2 to slide back and forth on the machine frame 1.

[0072] As Figures 10-13 shown, the wire pay-off frame device B includes a lower frame X-axis seat 12, a lower frame Y-axis seat 13, and a lower frame Z-axis seat 14.

[0073] The lower frame X-axis seat 12 and the lower frame Y-axis seat 13 are guidingly slidably engaged with each other in the left-right direction.

[0074] The lower frame Y-axis seat 13 and the lower frame Z-axis seat 14 are guidingly slidably engaged with each other in the up-down direction.

[0075] The lower frame Z-axis seat 14 and the receiving frame 11 are guidingly slidably engaged with each other in the front-back direction.

[0076] Furthermore, a lower frame driving assembly is respectively arranged between the lower frame X-axis seat 12 and the lower frame Y-axis seat 13, between the lower frame Y-axis seat 13 and the lower frame Z-axis seat 14, and between the lower frame Z-axis seat 14 and the support frame 11, and they are respectively slidably matched left and right, up and down, and front and back with each other through the lower frame driving assembly. The lower frame driving assembly at least includes a driver, and the driver is a servo driving motor or a pneumatic driver.

[0077] In this embodiment, a lower frame driving assembly is respectively arranged between the lower frame X-axis seat 12 and the lower frame Y-axis seat 13, between the lower frame Y-axis seat 13 and the lower frame Z-axis seat 14, and between the lower frame Z-axis seat 14 and the support frame 11. By using the driving effects of different lower frame driving assemblies, the above-mentioned components can be respectively slidably matched left and right, up and down, and front and back, so that finally the lower frame X-axis seat 12 provided with the lower traction pulley group 15 and the lower wire guiding pulley group 16 can slide left and right, up and down, and front and back relative to the conductive workbench on the frame 1, enabling the electrode wire 5 of the lower wire frame device B to be as close as possible to and aligned with the wire threading hole of the workpiece on the conductive workbench during wire threading, thereby improving the wire threading and connection accuracy of the electrode wire 5, ensuring the wire threading quality of the electrode wire 5, and avoiding the problem of breakage of the electrode wire 5 during operation.

[0078] The lower frame driving assembly is a servo driving motor or a pneumatic driver. The lower frame driving assembly of this embodiment preferably adopts a servo driving motor.

[0079] Specifically, a lower frame X-axis driving assembly is arranged between the lower frame X-axis seat 12 and the lower frame Y-axis seat 13. The lower frame X-axis driving assembly includes a lower frame X-axis ball screw bearing 17 and a lower frame X-axis servo driving motor 18.

[0080] The lower frame X-axis ball screw bearing 17 is arranged between the lower frame X-axis seat 12 and the lower frame Y-axis seat 13; the lower frame X-axis servo driving motor 18 is fixedly arranged on the lower frame X-axis seat 12 or the lower frame Y-axis seat 13, and its power output end is drivingly connected to the lower frame X-axis ball screw bearing 17.

[0081] A lower frame X-axis guide rail 19 and a lower frame X-axis slider 20 are further arranged between the lower frame X-axis seat 12 and the lower frame Y-axis seat 13, and they are slidably matched left and right in a guiding manner through the lower frame X-axis guide rail 19 and the lower frame X-axis slider 20.

[0082] In this embodiment, the lower frame X-axis servo driving motor 18 of this embodiment is fixedly arranged on the lower frame Y-axis seat 13. The lower frame X-axis guide rail 19 is arranged on one side surface of the lower frame Y-axis seat 13. The lower traction pulley group 15 and the lower wire guiding pulley group 16 are respectively arranged on one side surface of the lower frame X-axis seat 12. The lower frame X-axis slider 20 is arranged on the other side surface of the lower frame X-axis seat 12. The lower frame X-axis seat 12 can slide left and right on the lower frame Y-axis seat 13 in a guiding manner through the cooperation of the lower frame X-axis ball screw bearing 17, the lower frame X-axis servo driving motor 18, the lower frame X-axis guide rail 19, and the lower frame X-axis slider 20.

[0083] Furthermore, a lower Y-axis driving assembly is provided between the lower Y-axis seat 13 and the lower Z-axis seat 14. The lower Y-axis driving assembly includes a lower Y-axis ball screw bearing 21 and a lower Y-axis servo driving motor 22.

[0084] The lower Y-axis ball screw bearing 21 is arranged between the lower Y-axis seat 13 and the lower Z-axis seat 14; the lower Y-axis servo driving motor 22 is fixedly arranged on the lower Y-axis seat 13 or the lower Z-axis seat 14, and its power output end is drivingly connected to the lower Y-axis ball screw bearing 21.

[0085] A lower Y-axis guide rail 23 and a lower Y-axis slider 24 are also arranged between the lower Y-axis seat 13 and the lower Z-axis seat 14, and they are in guiding up-and-down sliding fit with each other through the lower Y-axis guide rail 23 and the lower Y-axis slider 24.

[0086] In this embodiment, the lower Y-axis servo driving motor 22 is fixedly arranged on the lower Z-axis seat 14. The lower Y-axis guide rail 23 is arranged on one side surface of the lower Z-axis seat 14, and the lower Y-axis slider 24 is arranged on the other side surface of the lower Y-axis seat 13. The lower Y-axis seat 13 can slide up and down in a guiding manner on the lower Z-axis seat 14 through the cooperation of the lower Y-axis ball screw bearing 21, the lower Y-axis servo driving motor 22, the lower Y-axis guide rail 23 and the lower Y-axis slider 24.

[0087] Furthermore, a lower Z-axis driving assembly is provided between the lower Z-axis seat 14 and the receiving frame 11. The lower Z-axis driving assembly includes a lower Z-axis ball screw bearing 25 and a lower Z-axis servo driving motor 26.

[0088] The lower Z-axis ball screw bearing 25 is arranged between the lower Z-axis seat 14 and the receiving frame 11; the lower Z-axis servo driving motor 26 is fixedly arranged on the lower Z-axis seat 14 or the receiving frame 11, and its power output end is drivingly connected to the lower Z-axis ball screw bearing 25.

[0089] A lower Z-axis guide rail 27 and a lower Z-axis slider 28 are also arranged between the lower Z-axis seat 14 and the receiving frame 11, and they are in guiding front-back sliding fit with each other through the lower Z-axis guide rail 27 and the lower Z-axis slider 28.

[0090] In this embodiment, the lower Z-axis servo driving motor 26 is fixedly arranged on the receiving frame 11. The lower Z-axis guide rail 27 is arranged at the bottom of the receiving frame 11, and the lower Z-axis slider 28 is arranged at the top of the lower Z-axis seat 14. The lower Z-axis seat 14 can slide forward in a guiding manner on the receiving frame 11 through the cooperation of the lower Z-axis ball screw bearing 25, the lower Z-axis servo driving motor 26, the lower Z-axis guide rail 27 and the lower Z-axis slider 28.

[0091] The lower wire wheel group 16 is arranged at the outer end of the lower frame X-axis seat 12; the lower frame X-axis seat 12 is provided with a lower clamp and a lower wire driver corresponding to the lower wire wheel group 16; the setting of the lower clamp can fix the electrode wire 5 located on the lower wire wheel group 16 and maintain the tension of the electrode wire 5, and the setting of the lower wire driver can drive the electrode wire 5 located on the lower wire wheel group 16, so that the electrode wire 5 can slide toward the direction of the wire threading hole of the workpiece.

[0092] A lower wire retracting and releasing buffer group 30 is also provided between the lower traction wheel group 15 and the lower conductor wheel group 16. The setting of the lower wire retracting and releasing buffer group 30 can buffer part of the electrode wire 5 on the lower frame X-axis seat 12 to facilitate the use of the electrode wire 5 during docking.

[0093] A lower wire tension detector is also provided on the lower traction wheel group 15, the lower wire wheel group 16, or the lower wire retracting and releasing buffer group 30. The setting of the lower wire tension detector can detect the tension of the electrode wire 5, so that the tension of the electrode wire 5 is guaranteed at all times when the wire is routed on the lower traction wheel group 15, the lower wire wheel group 16, and the lower wire retracting and releasing buffer group 30, so as to improve the stability of the electrode wire 5 when it is routed on the lower wire rack device B.

[0094] like Figures 6-9 As shown, the upper wire rack device A includes an upper frame X-axis seat 50, an upper frame Y-axis seat 51, and an upper frame Z-axis seat 52.

[0095] The upper frame X-axis seat 50 and the upper frame Y-axis seat 51 are matched with each other in a guided left-right sliding manner.

[0096] The upper frame Y-axis seat 51 and the upper frame Z-axis seat 52 are matched with each other in a guided upward and downward sliding manner.

[0097] The upper frame Z-axis seat 52 and the receiving frame 11 are matched with each other in a guided forward and backward sliding manner.

[0098] Furthermore, upper frame driving components are respectively arranged between the upper frame X-axis seat 50 and the upper frame Y-axis seat 51, between the upper frame Y-axis seat 51 and the upper frame Z-axis seat 52, and between the upper frame Z-axis seat 52 and the supporting frame 11, and the driving components are used to respectively achieve left-right, up-down, and front-back sliding cooperation with each other.

[0099] In this embodiment, an upper frame driving assembly is respectively arranged between the upper frame X-axis seat and the upper frame Y-axis seat, between the upper frame Y-axis seat and the upper frame Z-axis seat, and between the upper frame Z-axis seat and the receiving frame. By means of the driving actions of different upper frame driving assemblies, the above-mentioned components can respectively achieve left-right, up-down, and front-back sliding fits, so that finally the upper traction wheel set 53, the upper wire guide wheel set 54, the butt joint sleeve device C, and the wire cutting and butt joint device D can slide left-right, up-down, and front-back relative to the conductive workbench on the frame 1, enabling the electrode wire 5 of the upper wire frame device A to be as close as possible to and aligned with the wire threading hole of the workpiece on the conductive workbench during wire threading, thereby improving the wire threading and butt joint accuracy of the electrode wire 5, ensuring the wire threading quality of the electrode wire 5, and avoiding the problem of the electrode wire 5 breaking during operation.

[0100] Moreover, the butt joint sleeve device C can store a plurality of butt joint sleeves 34, facilitating the CNC wire cutting processing equipment to hold multiple butt joint sleeves 34 to complete the continuous butt joint work of the electrode wire 5, improving production efficiency. At the same time, the wire cutting and butt joint device D can cut the electrode wire 5 and can also cooperate with the butt joint sleeve device C to realize the butt joint of two disconnected electrode wires 5, so that the entire upper wire frame device A can realize the wire feeding, disconnection, and butt joint of the electrode wire 5 to meet the continuous processing requirements of the CNC wire cutting processing equipment.

[0101] The upper frame driving assembly is a servo drive motor or a pneumatic driver. The upper frame driving assembly of this embodiment preferably adopts a servo drive motor.

[0102] Specifically, an upper frame X-axis driving assembly is arranged between the upper frame X-axis seat 50 and the upper frame Y-axis seat 51. The upper frame X-axis driving assembly includes an upper frame X-axis ball screw bearing 57 and an upper frame X-axis servo drive motor 58.

[0103] The upper frame X-axis ball screw bearing 57 is arranged between the upper frame X-axis seat 50 and the upper frame Y-axis seat 51; the upper frame X-axis servo drive motor 58 is fixedly arranged on the upper frame X-axis seat 50 or the upper frame Y-axis seat 51, and its power output end is drivingly connected to the upper frame X-axis ball screw bearing 57.

[0104] An upper frame X-axis guide rail 59 and an upper frame X-axis slider 60 are also arranged between the upper frame X-axis seat 50 and the upper frame Y-axis seat 51, and they are in guiding left-right sliding fit with each other through the upper frame X-axis guide rail 59 and the upper frame X-axis slider 60.

[0105] In this embodiment, the upper shelf X-axis servo drive motor 58 is fixedly arranged on the upper shelf Y-axis seat 51. The upper shelf X-axis guide rail 59 is arranged on one side surface of the upper shelf Y-axis seat 51. The upper traction pulley group 53, the upper wire guide pulley group 54, and the shearing and splicing wire device D are respectively arranged on one side surface of the upper shelf X-axis seat 50. The upper shelf X-axis slider 60 and the butt joint sleeve device C are arranged on the other side surface of the upper shelf X-axis seat 50. The upper shelf X-axis seat 50 can slide left and right in a guiding manner on the upper shelf Y-axis seat 51 through the cooperation of the upper shelf X-axis ball screw bearing 57, the upper shelf X-axis servo drive motor 58, the upper shelf X-axis guide rail 59, and the upper shelf X-axis slider 60.

[0106] An upper shelf Y-axis drive assembly is arranged between the upper shelf Y-axis seat 51 and the upper shelf Z-axis seat 52. The upper shelf Y-axis drive assembly includes an upper shelf Y-axis ball screw bearing 61 and an upper shelf Y-axis servo drive motor 62.

[0107] The upper shelf Y-axis ball screw bearing 61 is arranged between the upper shelf Y-axis seat 51 and the upper shelf Z-axis seat 52; the upper shelf Y-axis servo drive motor 62 is fixedly arranged on the upper shelf Y-axis seat 51 or the upper shelf Z-axis seat 52, and its power output end is drivingly connected to the upper shelf Y-axis ball screw bearing 61.

[0108] An upper shelf Y-axis guide rail 63 and an upper shelf Y-axis slider 64 are also arranged between the upper shelf Y-axis seat 51 and the upper shelf Z-axis seat 52, and they are in guiding up and down sliding cooperation with each other through the upper shelf Y-axis guide rail 63 and the upper shelf Y-axis slider 64.

[0109] In this embodiment, the upper shelf Y-axis servo drive motor 62 is fixedly arranged on the upper shelf Z-axis seat 52. The upper shelf Y-axis guide rail 63 is arranged on one side surface of the upper shelf Z-axis seat 52. The upper shelf Y-axis slider 64 is arranged on the other side surface of the upper shelf Y-axis seat 51. The upper shelf Y-axis seat 51 can slide up and down in a guiding manner on the upper shelf Z-axis seat 52 through the cooperation of the upper shelf Y-axis ball screw bearing 61, the upper shelf Y-axis servo drive motor 62, the upper shelf Y-axis guide rail 63, and the upper shelf Y-axis slider 64.

[0110] An upper shelf Z-axis drive assembly is arranged between the upper shelf Z-axis seat 52 and the receiving frame 11. The upper shelf Z-axis drive assembly includes an upper shelf Z-axis ball screw bearing 65 and an upper shelf Z-axis servo drive motor 66.

[0111] The upper shelf Z-axis ball screw bearing 65 is arranged between the upper shelf Z-axis seat 52 and the receiving frame 11; the upper shelf Z-axis servo drive motor 66 is fixedly arranged on the upper shelf Z-axis seat 52 or the receiving frame 11, and its power output end is drivingly connected to the upper shelf Z-axis ball screw bearing 65.

[0112] An upper shelf Z-axis guide rail 67 and an upper shelf Z-axis slider 68 are also arranged between the upper shelf Z-axis seat 52 and the receiving frame 11, and they are in guiding front and back sliding cooperation with each other through the upper shelf Z-axis guide rail 67 and the upper shelf Z-axis slider 68.

[0113] In this embodiment, the upper mounting Z-axis servo drive motor 66 is fixedly arranged on the receiving frame 11. The upper mounting Z-axis guide rail 67 is arranged on the top of the receiving frame 11, and the upper mounting Z-axis slider 68 is arranged at the bottom of the upper mounting Z-axis seat 52. The upper mounting Z-axis seat 52 can slide forward in a guiding manner on the receiving frame 11 through the cooperation of the upper mounting Z-axis ball screw bearing 65, the upper mounting Z-axis servo drive motor 66, the upper mounting Z-axis guide rail 67, and the upper mounting Z-axis slider 68.

[0114] The upper wire guide wheel group 54 is arranged at the outer end of the upper mounting X-axis seat 50; the upper mounting X-axis seat 50 is provided with an upper clamp and an upper wire driver corresponding to the upper wire guide wheel group 54. The upper clamp can fix the electrode wire 5 located on the upper wire guide wheel group 54 and maintain the tension of the electrode wire 5. The upper wire driver can drive the electrode wire 5 located on the upper wire guide wheel group 54, so that the electrode wire 5 can slide in the direction of the wire threading hole of the workpiece.

[0115] An upper wire take-up and pay-off buffer group 69 is also arranged between the upper traction wheel group 53 and the upper wire guide wheel group 54. The upper wire take-up and pay-off buffer group 69 can buffer part of the electrode wire 5 on the upper mounting X-axis seat 50 to facilitate the connection and use of the electrode wire 5.

[0116] An upper wire tension detector is also arranged on the upper traction wheel group 53, the upper wire guide wheel group 54, or the upper wire take-up and pay-off buffer group 69. The upper wire tension detector can detect the tension of the electrode wire 5, so that the electrode wire 5 ensures a tension force at the moment of wire movement on the upper traction wheel group 53, the upper wire guide wheel group 54, and the upper wire take-up and pay-off buffer group 69, thereby improving the stability of the electrode wire 5 when moving on the upper wire rack device A.

[0117] As Figures 14-20 shown, the connection sleeve device C includes a connection sleeve frame 31, a connection sleeve register 32, and a pusher 33. The connection sleeve frame 31 is movably arranged on the upper wire rack device A. The connection sleeve register 32 is detachably installed on the connection sleeve frame 31, and a number of connection sleeves 34 are stored thereon. The pusher 33 is movably arranged on the connection sleeve register 32 and, when moving, pushes a number of connection sleeves 34 one by one to the connection port 35 of the connection sleeve register 32.

[0118] In this embodiment, a connection sleeve device C is arranged on the upper wire rack device A. The connection sleeve register 32 of the connection sleeve device C can store a number of connection sleeves 34, so that the wire cutting machine can hold multiple connection sleeves 34 to complete the continuous connection work of the electrode wire 5, improving the production efficiency. Moreover, the pusher 33 on the connection sleeve register 32 can automatically push a number of connection sleeves 34 one by one to the connection port 35, so that the two disconnected electrode wires 5 can respectively penetrate into both ends of the connection sleeve 34, enabling the wire cutting and connecting device D arranged on the upper wire rack device A to complete the connection of the two electrode wire ends, with low processing costs.

[0119] Specifically, a storage cavity 36 is provided in the connection sleeve register 32; there is an adhesive between several connection sleeves 34, and they are adhesively attached to each other in a straight line through the adhesive. Therefore, when several connection sleeves 34 are assembled, they are arranged in a front-to-back manner and stored in the storage cavity 36, which is convenient for assembly.

[0120] The connection port 35 is provided at one end of the connection sleeve register 32 in a vertically penetrating manner; the connection port 35 is provided with a connection sleeve limiting portion 37 corresponding to the connection sleeve 34.

[0121] When the connection sleeve 34 is pushed onto the connection port 35, the connection sleeve 34 can be limited on the connection sleeve limiting portion 37. At the same time, the upper and lower ports of the connection sleeve 34 are communicated with the upper and lower ports of the connection port 35. Therefore, the electrode wire 5 can pass through the connection sleeve 34, and the connection sleeve 34 can also move up and down on the connection port 35.

[0122] In order to facilitate the placement of the connection sleeve 34, a storage port is provided at the other end of the connection sleeve register 32; several connection sleeves 34 are stored in the storage cavity 36 through the storage port; at the same time, a plug 38 is detachably installed on the storage port.

[0123] When it is necessary to place the connection sleeve 34, the plug 38 is detached from the storage port, and the connection sleeve 34 can be stored in the storage cavity 36 through the storage port. When the placement of the connection sleeve 34 is completed, the plug 38 is reassembled on the storage port to prevent foreign objects from entering the storage cavity 36 through the storage port.

[0124] An elastic member 72 is provided between the pusher 33 and the plug 38 or the connection sleeve register 32; the pusher 33 is elastically movably arranged in the storage cavity 36 through the elastic member 72 and pushes several connection sleeves 34 onto the connection port 35 one by one during movement.

[0125] Among them, the elastic member 72 can be a compression spring or a tension spring, and its elastic force can act between the pusher 33 and the plug 38 or the connection sleeve register 32, so that finally the pusher 33 can elastically move in the direction of the connection port 35 and push several connection sleeves 34 onto the connection port 35 one by one.

[0126] The elastic member 72 in this embodiment is a compression spring, one end of which is elastically positioned and sleeved on the pusher 33, and the other end is elastically positioned and sleeved on the plug 38, with a simple structure.

[0127] In order to facilitate the assembly of the connection sleeve holder 31, a register assembly portion 39 is provided on the connection sleeve holder 31; the connection sleeve register 32 is detachably installed on the register assembly portion 39. That is, the connection sleeve holder 31 can be detached and assembled from the register assembly portion 39 to facilitate placing several connection sleeves 34 on the connection sleeve register 32.

[0128] Furthermore, a first extension arm 40 is provided on the upper wire rack device A. A Z-axis guide rail 41 and a Z-axis slider 42 of the connection sleeve rack are provided between the first extension arm 40 and the connection sleeve rack 31, and they are in guiding front-back movement cooperation with each other through the Z-axis guide rail 41 and the Z-axis slider 42 of the connection sleeve rack.

[0129] In this embodiment, a Z-axis servo drive motor of the connection sleeve rack is provided on the connection sleeve rack 31 or the first extension arm 40, and the Z-axis servo drive motor of the connection sleeve rack can drive the connection sleeve rack 31. At the same time, the Z-axis guide rail 41 of the connection sleeve rack is provided on the first extension arm 40, and the Z-axis slider 42 of the connection sleeve rack is provided on the connection sleeve rack 31. The connection sleeve rack 31 can move forward in a guiding manner on the first extension arm 40 through the cooperation of the Z-axis servo drive motor, the Z-axis guide rail 41, and the Z-axis slider 42 of the connection sleeve rack.

[0130] The wire cutting and connecting device D includes a wire cutting and connecting frame 43 and a wire cutting and connecting tool 44; the wire cutting and connecting frame 43 is movably provided on the upper wire rack device A; the wire cutting and connecting tool 44 is a pneumatic cutting pliers and is provided on the wire cutting and connecting frame 43, and moves with the wire cutting and connecting frame 43 and is close to the connection port 35 of the connection sleeve device C.

[0131] A cutting position 70 and a clamping position 71 are provided on the wire cutting and connecting tool 44, and the cutting position 70 is located behind the clamping position 71.

[0132] The wire cutting and connecting tool 44 cuts the electrode wire 5 through the cutting position 70.

[0133] The wire cutting and connecting tool 44 clamps the connection sleeve 34 through the clamping position 71 to realize the connection of the two broken ends of the electrode wire 5 located in the connection sleeve 34.

[0134] The connection sleeve 34 is an aluminum tube. The wire cutting and connecting tool 44 cuts the electrode wire 5 with the cutting position 70 and clamps and deforms the connection sleeve 34 with the clamping position 71 until the internal space is clamped; when the two wire ends of the cut electrode wire 5 are inserted into the aluminum tube, the wire cutting and connecting tool 44 clamps the two wire ends in the connection sleeve 34 after clamping and deformation.

[0135] Since several connection sleeves 34 are pasted together, when the clamping position 71 clamps the connection sleeve 34 at the forefront, it will pull it, separating the connection sleeve 34 at the forefront from the other connection sleeves 34 and completing the connection of the two broken ends of the electrode wire.

[0136] Since the connection sleeve 34 at the forefront is separated from the other connection sleeves 34, the wire reel 3 can collect the connection sleeve 34 and the connected electrode wire.

[0137] That is, the wire cutting and splicing device 44 can not only cut the electrode wire 5, but also cooperate with the splicing sleeve device C to splice two disconnected electrode wires 5.

[0138] A second extension arm 45 is provided on the upper wire frame device A. A wire cutting and splicing frame Z-axis guide rail 46 and a wire cutting and splicing frame Z-axis slider 47 are provided between the second extension arm 45 and the wire cutting and splicing frame 43, and they are guided and movably matched with each other in the front-back direction through the wire cutting and splicing frame Z-axis guide rail 46 and the wire cutting and splicing frame Z-axis slider 47.

[0139] In this embodiment, the first extension arm 40 extends towards one side of the upper wire frame device A, and the second extension arm 45 extends towards the other side of the upper wire frame device A.

[0140] A wire cutting and splicing frame Z-axis servo drive motor is provided on the wire cutting and splicing frame 43 or the second extension arm 45. The wire cutting and splicing frame Z-axis servo drive motor can drive the wire cutting and splicing frame 43. At the same time, the wire cutting and splicing frame Z-axis guide rail 46 is provided on the second extension arm 45, and the wire cutting and splicing frame Z-axis slider 47 is provided on the wire cutting and splicing frame 43. The wire cutting and splicing frame 43 can be guided and movably in the front direction on the second extension arm 45 through the cooperation of the wire cutting and splicing frame Z-axis servo drive motor, the wire cutting and splicing frame Z-axis guide rail 46, and the wire cutting and splicing frame Z-axis slider 47.

[0141] The scissors position 70, the clamping knife position 71 of the wire cutting and splicing device 44 and the splicing port 35 are in front-back correspondence, and can move away from and close to each other, so as to facilitate the wire feeding, disconnection, and splicing of the electrode wire 5.

[0142] A drill bit is also provided on the upper wire frame device A or the lower wire frame device B.

[0143] Furthermore, the conductive workbench of this embodiment is fixedly arranged, and a workpiece is placed thereon. The workpiece is drilled with a workpiece wire threading hole by the drill bit, so that the workpiece can be placed on the conductive workbench without pre-drilling, improving the convenience and efficiency of workpiece cutting processing. Moreover, it can also enable the two disconnected electrode wires 5 to quickly and accurately find the orientation of the workpiece wire threading hole during splicing, improving the splicing efficiency of the electrode wire 5.

[0144] The electrode wire 5 located on the lower wire frame device B can move towards the direction of the workpiece wire threading hole through the cooperation of the lower traction wheel group 15 and the lower wire guiding wheel group 16. Since the lower frame X-axis seat 12 can move left and right, up and down, and front and back, the electrode wire 5 can also move left and right, up and down, and front and back relative to the workpiece wire threading hole, so that the electrode wire 5 can be as close as possible to and aligned with the lower part of the workpiece wire threading hole during wire threading, thereby avoiding the problem that the electrode wire 5 is bent and deformed when entering the workpiece wire threading hole due to its own gravity, and ensuring that the electrode wire 5 can accurately enter the workpiece wire threading hole from below the workpiece.

[0145] The electrode wire 5 located on the upper wire rack device A can slide towards the wire threading hole of the workpiece through the cooperation of the upper traction pulley group 53 and the upper wire guiding pulley group 54. Since the upper rack X-axis seat 50 can slide left and right, up and down, and front and back, the electrode wire 5 can also slide left and right, up and down, and front and back relative to the wire threading hole of the workpiece, so that the electrode wire 5 can be as close as possible to and aligned with the upper part of the wire threading hole of the workpiece when threading, thereby avoiding the problem of bending and deformation of the electrode wire 5 when entering the wire threading hole of the workpiece, and ensuring that the electrode wire 5 can accurately enter the wire threading hole of the workpiece from above the workpiece.

[0146] The automatic wire threading method of this CNC wire cutting processing equipment:

[0147] Take the original positions of the upper traction pulley group 53 and the lower traction pulley group 15 as the positioning coordinate axes of the wire guiding shaft, and the system can control the upper traction pulley group 53 and the lower traction pulley group 15 to move at any point within the set stroke range. When it is necessary to transfer the electrode wire 5 from one processing hole to another processing hole, start the upper and lower clamps to fix the electrode wire 5 on both the upper and lower sides of the conductive workbench, maintain the tension of the electrode wire 5 on the wire reel 3, start the connecting sleeve device C to cut the electrode wire 5 on both the upper and lower sides of the conductive workbench to form an opening, and the lower traction pulley group 15 rotates in reverse to retract the electrode wire 5 without tension and keep the end of the electrode wire 5 close to the port position of the lower clamp; then, the upper wire rack device A and the lower wire rack device B slide back and forth and left and right respectively (or the conductive workbench drives the workpiece to slide back and forth and left and right) until the electrode wire 5 on the upper wire rack device A is aligned with the upper part of the working wire threading hole, and the electrode wire 5 on the lower wire rack device B is aligned with the lower part of the working wire threading hole. At this time, the lower wire rack device B moves along the Y-axis direction to be close to the workpiece and makes the end of the electrode wire 5 on it face the working wire threading hole directly. The lower traction pulley group 15 rotates forward, and at the same time, the lower wire take-up and buffer group 30 pays out the wire and guides out the electrode wire 5, which passes through the workpiece and penetrates into the connecting sleeve 34. Moreover, the upper traction pulley group 53 rotates forward, and at the same time, the upper wire take-up and buffer group 69 pays out the wire and guides out the electrode wire 5, which passes through the workpiece and penetrates into the connecting sleeve 34; start the connecting sleeve device C to connect the two ends of the electrode wire 5, release the upper and lower clamps, and the wire reel 3 stores the section of the electrode wire 5 with the connecting sleeve 34 in the groove 6. During the subsequent reciprocating work of wire cutting processing, the section of the electrode wire 5 with the connecting sleeve 34 is set as the non-working section. During the working process, the upper and lower wire tension detectors are adjusted according to the data set by the system to finely adjust the tension of the electrode wire 5.

[0148] The upper wire rack device A and the lower wire rack device B can be directly opposite or staggered, so that the workpiece can be processed into a tapered surface, straight hole, and curved surface with irregular angles.

[0149] The above is the preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A numerically controlled wire cutting machine, comprising a frame (1), characterized in that: A wire spool (3), a receiving frame (11), and a conductive workbench are provided on the frame (1). The wire spool (3) is movably arranged on the frame (1), and a wire electrode (5) is wound thereon and unreeled therefrom. An upper wire guide device (A) and a lower wire guide device (B) for guiding the movement of the wire electrode (5) are provided on the receiving frame (11). The conductive workbench is insulated from the frame (1) and is located between the upper wire guide device (A) and the lower wire guide device (B). The upper wire guide device (A) and the lower wire guide device (B) are respectively movably arranged on the receiving frame (11), and / or the conductive workbench is movably arranged on the frame (1). A ferrule device (C) for storing and automatically pushing a ferrule (34) and a wire cutting and connecting device (D) for cutting and connecting the wire electrode (5) are provided on the upper wire guide device (A) or the lower wire guide device (B). The ferrule device (C) includes a ferrule holder (31), a ferrule register (32), and a pusher (33); the ferrule holder (31) is movably arranged on the upper wire guide device (A); the ferrule register (32) is detachably installed on the ferrule holder (31), and a plurality of ferrules (34) are stored thereon; the pusher (33) is movably arranged on the ferrule register (32), and when moving, pushes the plurality of ferrules (34) one by one to the ferrule opening (35) of the ferrule register (32). The wire cutting and connecting device (D) includes a wire cutting and connecting frame (43) and a wire cutting and connecting tool (44); the wire cutting and connecting frame (43) is movably arranged on the upper wire guide device (A); the wire cutting and connecting tool (44) is a pneumatic cutting pliers and is arranged on the wire cutting and connecting frame (43), and moves with the wire cutting and connecting frame (43) and is close to the ferrule opening (35) of the ferrule device (C).

2. The numerically controlled wire cutting processing equipment according to claim 1, wherein: A wire spool frame (2) is provided on the frame (1), and the wire spool frame (2) slides back and forth on the frame (1); the wire spool (3) rotates reciprocally on the wire spool frame (2), and a groove (6) for collecting the wire electrode (5) and / or the ferrule (34) is provided thereon.

3. The numerically controlled wire cutting processing equipment according to claim 2, characterized in that: The lower wire guide device (B) includes a lower X-axis seat (12), a lower Y-axis seat (13), and a lower Z-axis seat (14). There is a guiding left-right sliding fit between the lower X-axis seat (12) and the lower Y-axis seat (13). There is a guiding up-down sliding fit between the lower Y-axis seat (13) and the lower Z-axis seat (14). There is a guiding front-back sliding fit between the lower Z-axis seat (14) and the receiving frame (11).

4. The numerically controlled wire cutting processing equipment according to claim 3, characterized in that: The lower shelf X-axis seat (12) is further provided with a lower traction wheel group (15) and a lower wire guiding wheel group (16); the lower wire guiding wheel group (16) is arranged at the outer end of the lower shelf X-axis seat (12); the lower shelf X-axis seat (12) is provided with a lower clamp and a lower wire driver corresponding to the lower wire guiding wheel group (16); a lower wire take-up and pay-off buffer group (30) is further arranged between the lower traction wheel group (15) and the lower wire guiding wheel group (16); a lower wire tension detector is further arranged on the lower traction wheel group (15), the lower wire guiding wheel group (16) or the lower wire take-up and pay-off buffer group (30).

5. The numerically controlled wire cutting processing equipment according to claim 4, characterized in that: The upper shelf device (A) includes an upper shelf X-axis seat (50), an upper shelf Y-axis seat (51), and an upper shelf Z-axis seat (52); A guiding left-right sliding fit is arranged between the upper shelf X-axis seat (50) and the upper shelf Y-axis seat (51); A guiding up-down sliding fit is arranged between the upper shelf Y-axis seat (51) and the upper shelf Z-axis seat (52); A guiding front-back sliding fit is arranged between the upper shelf Z-axis seat (52) and the receiving frame (11).

6. The numerically controlled wire cutting processing equipment according to claim 5, characterized in that: The upper shelf X-axis seat (50) is further provided with an upper traction wheel group (53) and an upper wire guiding wheel group (54); the upper wire guiding wheel group (54) is arranged at the outer end of the upper shelf X-axis seat (50); the upper shelf X-axis seat (50) is provided with an upper clamp and an upper wire driver corresponding to the upper wire guiding wheel group (54); an upper wire take-up and pay-off buffer group (69) is further arranged between the upper traction wheel group (53) and the upper wire guiding wheel group (54); an upper wire tension detector is further arranged on the upper traction wheel group (53), the upper wire guiding wheel group (54) or the upper wire take-up and pay-off buffer group (69).

7. The numerically controlled wire cutting processing equipment according to claim 6, characterized in that: The wire cutting and splicing device (44) is provided with a scissor position (70) and a clamping knife position (71); The wire cutting and splicing device (44) cuts the electrode wire (5) through the scissor position (70); The wire cutting and splicing device (44) clamps the splicing sleeve (34) through the clamping knife position (71) to realize the connection of the broken ends of the two electrode wires (5) located in the splicing sleeve (34).

8. An automatic wire threading method for the numerically controlled wire cutting machine tool according to claim 7, characterized in that: Taking the original positions of the upper traction wheel group (53) and the lower traction wheel group (15) as the positioning coordinate axes of the wire guiding shaft, the system can control the movement of the upper traction wheel group (53) and the lower traction wheel group (15) at any point within the set stroke range; When it is necessary to transfer the electrode wire (5) from one machining hole to another, start the upper and lower clamps to fix the electrode wire (5) on both the upper and lower sides of the conductive workbench, maintain the tension of the electrode wire (5) on the wire reel (3), start the ferrule device (C) to cut the electrode wire (5) on both the upper and lower sides of the conductive workbench to form an opening, reverse the lower traction wheel group (15) to retract the electrode wire (5) without tension, and keep the end of the electrode wire (5) close to the port of the lower clamp; then, the upper wire frame device (A) and the lower wire frame device (B) slide back and forth and left and right respectively, or the conductive workbench drives the workpiece to slide back and forth and left and right; until the electrode wire (5) on the upper wire frame device (A) is aligned above the working wire threading hole, and the electrode wire (5) on the lower wire frame device (B) is aligned below the working wire threading hole. At this time, the lower wire frame device (B) moves along the Y-axis direction to approach the workpiece, and makes the end of the electrode wire (5) on it face the working wire threading hole directly. The lower traction wheel group (15) rotates forward, and at the same time, the lower wire take-up and buffer group (30) pays out the wire and guides the electrode wire (5) to pass through the workpiece and into the ferrule (34). Moreover, the upper traction wheel group (53) rotates forward, and at the same time, the upper wire take-up and buffer group (69) pays out the wire and guides the electrode wire (5) to pass through the workpiece and into the ferrule (34); start the ferrule device (C) to connect the two ends of the electrode wire (5), release the upper and lower clamps, and the wire reel (3) stores the electrode wire (5) with the ferrule (34) in the groove (6). During the subsequent reciprocating wire cutting process, the electrode wire (5) in the ferrule (34) section is set as the non-working section; during the working process, the upper wire frame device (A) and the lower wire frame device (B) can be aligned or staggered, so that the workpiece can be processed into a tapered surface, a straight hole, or a curved surface at an irregular angle.

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