Electrical discharge wire cutting apparatus and method

Abstract

The application discloses a kind of wire-cut electrical discharge machining device and method, it is related to material cutting technical field, including opening adjusting module, control module, and with the mobile sliding table module and reciprocating wire conveying processing module of control module electricity connection, mobile sliding table module is used to adhere to the workpiece to be processed or auxiliary tool, opening adjusting module is installed on mobile sliding table module, and mobile sliding table module can drive opening adjusting module linearly moves, reciprocating wire conveying processing module is installed on opening adjusting module, and opening adjusting module can adjust the opening size of reciprocating wire conveying processing module, reciprocating wire conveying processing module can be wire and wire, and electrode wire extends and is limited in the opening of reciprocating wire conveying processing module, and electrode wire can be cut to workpiece to be processed at the opening of reciprocating wire conveying processing module.The application can be in situ processing, and good adaptability, high stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material cutting, in particular to a wire electrical discharge machining device and method. BACKGROUND

[0002] Wire electrical discharge machining technology is a technology for removing conductive materials through pulse spark discharge, which can realize material cutting and forming. At present, wire electrical discharge machining equipment mainly exists in the form of general wire electrical discharge machining machine tools and special wire electrical discharge machining machine tools. According to the characteristics of the machining process, it is mainly divided into slow wire electrical discharge machining machine tools, reciprocating medium wire electrical discharge machining machine tools and fast wire electrical discharge machining machine tools. So far, in the scene using wire electrical discharge machining technology, the machined material is usually placed on the workbench of the equipment, and the movement of the electrode wire is controlled to realize the cutting and machining of the material.

[0003] However, in some special scenarios, the machined part cannot be placed on the machine tool. For example, during the maintenance of a nuclear power plant, the heat insulation sleeve cannot be completely removed, but the segmented cutting of the pipeline needs to be realized, so a wire electrical discharge machining equipment needs to be installed at the working position to realize cutting. For example, parts in a nuclear reactor, such as fuel assembly support structures or cooling pipes, etc. For example, the maintenance of ship propellers or other underwater equipment often cannot be carried out in a dry dock, especially online cutting and replacement during long-distance navigation. In many similar use scenarios, it is necessary to realize the servo discharge and cutting movement of the electrode wire and the machined part, so a set of light, small and flexible device and controller is needed. However, the current device is difficult to install the movement mechanism at the machining position, and the complex wire conveying mechanism cannot be integrated into a small space. SUMMARY

[0004] The purpose of the present application is to provide a wire electrical discharge machining device and method to solve the problems existing in the prior art and realize in-situ machining with good adaptability and high stability.

[0005] To achieve the above purpose, the present application provides the following solutions:

[0006] The application provides a wire-cut electrical discharge machining device, which comprises an opening adjusting module, a control module, a moving slide module and a reciprocating wire conveying machining module electrically connected with the control module, the moving slide module is used for being attached to a workpiece to be machined or an auxiliary tool, the opening adjusting module is installed on the moving slide module, and the moving slide module can drive the opening adjusting module to move linearly, the reciprocating wire conveying machining module is installed on the opening adjusting module, and the opening adjusting module can adjust the opening size of the reciprocating wire conveying machining module, the reciprocating wire conveying machining module can wind and unwind the electrode wire, the electrode wire extends out of and is limited in the opening of the reciprocating wire conveying machining module, and the electrode wire can cut the workpiece to be machined at the opening of the reciprocating wire conveying machining module.

[0007] In an embodiment, the moving slide module comprises a stepping motor, a sliding assembly and a workbench, the workbench is installed on the sliding assembly, the opening adjusting module is installed on the workbench, the stepping motor is installed at one end of the sliding assembly, the stepping motor can drive the sliding assembly to move and make the workbench move reciprocally along the length direction of the sliding assembly, and the stepping motor is electrically connected with the control module.

[0008] In an embodiment, the sliding assembly comprises a translation slide, a lead screw and a moving slider, the lead screw is rotationally connected in the translation slide, the stepping motor is installed at one end of the translation slide, the output shaft of the stepping motor is connected with one end of the lead screw, the moving slider is sleeved on the outer periphery of the lead screw, and the moving slider is slidingly connected in the translation slide, and the workbench is installed on the upper end of the moving slider.

[0009] In an embodiment, the opening adjusting module comprises an adjusting fixed table, a threaded rotating shaft, an adjusting knob, a left adjusting slider and a right adjusting slider, the adjusting fixed table is installed on the moving slide module, the upper end of the adjusting fixed table is provided with an adjusting groove, the threaded rotating shaft is rotationally installed in the adjusting groove, the adjusting knob is installed at one end of the threaded rotating shaft, the outer periphery of the threaded rotating shaft is provided with two threads with opposite rotation directions, the left adjusting slider and the right adjusting slider are threadedly connected with the two threads with opposite rotation directions respectively, and the left adjusting slider and the right adjusting slider are slidingly connected in the adjusting groove, the upper end of the left adjusting slider and the upper end of the right adjusting slider are connected with two wire conveying units of the reciprocating wire conveying machining module respectively, and the two wire conveying units can be driven to move towards each other or away from each other.

[0010] In an embodiment, the opening adjusting module further comprises a middle positioning shaft, which is installed in the adjusting groove and is perpendicular to the threaded rotating shaft, the middle part of the threaded rotating shaft is provided with two clamping plates, and a limiting gap is formed between the two clamping plates, the middle part of the middle positioning shaft is provided with a clamping groove, the threaded rotating shaft can be embedded in the clamping groove, and the two clamping plates can limit the middle positioning shaft in the limiting gap.

[0011] In an embodiment, the side wall of the adjusting fixed table is provided with a locking screw corresponding to the position of the left adjusting slider and the right adjusting slider, the locking screw can be loosened to adjust the distance between the left adjusting slider and the right adjusting slider through the threaded rotating shaft, and the locking screw can be tightened to abut against the left adjusting slider and the right adjusting slider respectively to fix the position of the left adjusting slider and the right adjusting slider.

[0012] In an embodiment, the opening adjusting module further comprises two locking pressing plates, which are symmetrically installed on the upper end of the adjusting fixed table, the upper end of the left adjusting slider and the upper end of the right adjusting slider are provided with limiting steps on both sides, the two locking pressing plates can be respectively limited on the limiting steps on both sides of the left adjusting slider and the limiting steps on both sides of the right adjusting slider, and are connected to the upper end face of the adjusting fixed table through bolts.

[0013] In an embodiment, the reciprocating wire conveying processing module comprises a left wire conveying unit, a right wire conveying unit and a waterproof telescopic shell, the left wire conveying unit comprises a left shell, a left wire conveying motor, a left coupling, a left rolling thread wheel, a left rolling thread bearing, a left guide wheel, a left guide wire bearing and a left guide wire nozzle, the left shell is mounted on the left adjusting slider, the left wire conveying motor is mounted on the upper end of the left shell, the output shaft of the left wire conveying motor extends into the left shell and connects the left rolling thread wheel through the left coupling and the left rolling thread bearing, the left guide wheel is rotatably mounted in the left shell through the left guide wire bearing, and the left guide wire nozzle is mounted on the side wall of the left shell; the right wire conveying unit comprises a right shell, a right wire conveying motor, a right coupling, a right rolling thread wheel, a right rolling thread bearing, a right guide wheel, a right guide wire bearing and a right guide wire nozzle, the right shell is mounted on the right adjusting slider, the right wire conveying motor is mounted on the upper end of the right shell, the output shaft of the right wire conveying motor extends into the right shell and connects the right rolling thread wheel through the right coupling and the right rolling thread bearing, the right guide wheel is rotatably mounted in the right shell through the right guide wire bearing, and the right guide wire nozzle is mounted on the side wall of the right shell; the left shell and the right shell are both curved, and the two ends of the waterproof telescopic shell are respectively mounted on the first end of the left shell and the first end of the right shell, the left guide wire nozzle is mounted on the second end of the left shell, and the right guide wire nozzle is mounted on the second end of the right shell; one end of the electrode wire is fixedly wound on the left rolling thread wheel, the other end of the electrode wire sequentially passes through the left guide wheel, the left guide wire nozzle, the right guide wire nozzle and the right guide wheel, and is fixedly wound on the right rolling thread wheel, and the electrode wire between the left guide wire nozzle and the right guide wire nozzle is used for cutting the workpiece to be processed.

[0014] In an embodiment, the left shell comprises a left top shell, a left side shell and a left bottom shell, the left top shell is encapsulated in the upper end of the left side shell, the left bottom shell is encapsulated in the lower end of the left side shell, and the left top shell is provided with a hole for the output shaft of the left wire conveying motor to pass through, the inner wall of the left bottom shell is connected with a left tensioning mechanism through a spring, and the left tensioning mechanism can contact the electrode wire on the side away from the spring; the right shell comprises a right top shell, a right side shell and a right bottom shell, the right top shell is encapsulated in the upper end of the right side shell, the right bottom shell is encapsulated in the lower end of the right side shell, and the right top shell is provided with a hole for the output shaft of the right wire conveying motor to pass through, the inner wall of the right bottom shell is connected with a right tensioning mechanism through a spring, and the right tensioning mechanism can contact the electrode wire on the side away from the spring, and the left side shell and the right side shell are both provided with a working liquid interface.

[0015] The application also provides an electric spark wire cutting processing method, which uses the electric spark wire cutting processing device in any of the above technical solutions and comprises the following steps:

[0016] S1. Moving the wire electrical discharge machining device to the installation position, and realizing the assembly of the wire electrical discharge machining device, then connecting one end of the machining pulse power source in the control module to the workpiece to be machined;

[0017] S2. Adjusting the opening size of the reciprocating wire conveying machining module through the opening adjusting module to adapt to different use scenarios and use requirements;

[0018] S3. Controlling the movement of the moving slide module through the control module, and driving the reciprocating wire conveying machining module to find the machining starting position;

[0019] S4. Controlling the opening of the machining pulse power source through the control module, and controlling the servo movement of the moving slide module, at the same time, controlling the working liquid through the control module, the working liquid enters the inside of the reciprocating wire conveying machining module through the working liquid interface, and then flows to the machining part from the liquid flushing holes around the left and right wire guide nozzles;

[0020] S5. Discharge cutting according to the set machining program until the machining is completed;

[0021] S6. Disassembling the wire electrical discharge machining device from the installation position, transporting it to the next position to be machined, repeating S1-S5 until all the machining tasks are completed and then withdrawing.

[0022] The present application has the following technical effects compared with the prior art:

[0023] The electric spark wire cutting machining device and method provided by the application, the movable sliding table module is used for being attached to a workpiece to be machined or an auxiliary tool, the opening adjusting module is installed on the movable sliding table module, and the movable sliding table module can drive the opening adjusting module to move linearly, and the reciprocating wire conveying machining module is installed on the opening adjusting module, the overall structure is simple and compact, the mode of "tool seeking workpiece" is replaced by the mode of "workpiece seeking tool", the electric spark wire cutting machining device is fixed on a part to be machined at will, the heavy machine tool body is got rid of, the working condition that many machined parts cannot be disassembled but need to be machined and cut is solved, in-situ discharge cutting is realized, the opening adjusting module can adjust the opening size of the reciprocating wire conveying machining module, and then different machining needs can be adapted, the application range is wide, the reciprocating wire conveying machining module can wind and unwind the electrode wire, the problems that the electrode wire is relaxed and separated or is torn off due to excessive tension caused by the reduction or accumulation of the electrode wire due to the winding or unwinding action alone are avoided, and then stable wire tension is provided, meanwhile, stable control of discharge cutting is realized by cooperating with the control module, machining stability and machining efficiency are improved, the tension of the electrode wire is always in a reasonable range through the rotation cooperation of the two wire conveying motors, the electrode wire is relaxed and separated from the guide or is torn off due to excessive tension caused by the reduction or accumulation of the electrode wire in the winding and unwinding process of the wire barrel, and the electrode wire is extended and limited at the opening of the reciprocating wire conveying machining module, and the electrode wire can cut the workpiece to be machined at the opening of the reciprocating wire conveying machining module. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description only constitute some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0025] Figure 1 It is a structural schematic diagram of the electric spark wire cutting machining device in embodiment one.

[0026] Figure 2 It is an exploded view of the reciprocating wire conveying machining module in embodiment one.

[0027] Figure 3 It is a structural schematic diagram of the opening adjusting module in embodiment one.

[0028] Figure 4 It is a partial structural schematic diagram of the right wire conveying unit in embodiment one.

[0029] Figure 5 It is a physical diagram of the machined workpiece obtained by using the electric spark wire cutting machining method in embodiment two.

[0030] Figure 6 The current and voltage waveforms of a single pulse normal discharge collected in the electric spark wire cutting processing method in Example 2 are shown in the figure.

[0031] In the figure: 1 - opening adjustment module, 2 - left bottom shell, 3 - left side shell, 4 - left top shell, 5 - electrode wire, 6 - left mounting seat, 7 - left wire running motor, 8 - right wire running motor, 9 - right mounting seat, 10 - right side shell, 11 - right top shell, 12 - right bottom shell, 13 - waterproof telescopic shell, 14 - moving slide module, 15 - right guide nozzle, 16 - right guide wheel, 17 - right wire rolling wheel, 18 - right coupling, 19 - left coupling, 20 - left wire rolling wheel, 21 - left wire rolling bearing, 22 - left guide wheel, 23 - left guide bearing, 24 - left guide nozzle, 25 - tensioning mechanism, 26 - right guide bearing, 27 - right wire rolling bearing, 28 - workpiece to be processed, 101 - adjustment fixed table, 102 - threaded rotating shaft, 103 - locking screw, 104 - left adjustment sliding block, 105 - locking pressing piece, 106 - middle positioning shaft, 107 - right adjustment sliding block, 1001 - working fluid interface, 1002 - control module, 281 - cutting section. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0033] The present application aims to provide an electric spark wire cutting processing device and method to solve the problems in the prior art, and to achieve in-situ processing, good adaptability and high stability.

[0034] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0035] Example 1

[0036] As Figures 1-6As shown, the embodiment provides a wire electrical discharge machining device, which comprises an opening adjusting module 1, a control module 1002, and a moving slide module 14 and a reciprocating wire feeding machining module electrically connected with the control module 1002. The moving slide module 14 is used to be attached to a workpiece 28 to be machined or an auxiliary tool, so as to realize single-axis servo cutting motion by fixing the moving slide module 14 on the surface of the machined part. The opening adjusting module 1 is installed on the moving slide module 14 and can be linearly moved by the moving slide module 14. The reciprocating wire feeding machining module is installed on the opening adjusting module 1. The overall structure is simple and compact. The "tool finds workpiece" mode is used to replace the "workpiece finds tool" mode, so as to realize the random fixing of the wire electrical discharge machining device on the part to be machined, and get rid of the heavy machine tool body. The working condition that the machined part cannot be disassembled but needs to be machined and cut is solved, and in-situ discharge cutting is realized. The opening adjusting module 1 can adjust the opening size of the reciprocating wire feeding machining module, so as to adapt to different machining needs and have wide application range. The reciprocating wire feeding machining module can wind and unwind the electrode wire 5, so as to avoid the problems of electrode wire 5 relaxation and disengagement or excessive tension caused by the reduction or accumulation of the electrode wire 5 due to pure unwinding or winding action, and thus realize the stable wire tension. At the same time, the stable control of discharge cutting is realized by cooperating with the control module 1002, so as to improve the machining stability and efficiency. The rotation of the two wire feeding motors is used to realize that the tension of the electrode wire 5 is always in a reasonable range, so as to avoid the problems of electrode wire 5 relaxation and disengagement or excessive tension caused by the reduction or accumulation of the electrode wire 5 due to the unwinding and winding of the wire barrel. The electrode wire 5 extends and is limited in the opening of the reciprocating wire feeding machining module, and the electrode wire 5 can cut the workpiece 28 to be machined at the opening of the reciprocating wire feeding machining module.

[0037] Specifically, the moving slide module 14 comprises a stepping motor, a sliding assembly, and a workbench. The workbench is installed on the sliding assembly, and the opening adjusting module 1 is installed on the workbench. The stepping motor is installed at one end of the sliding assembly. The stepping motor can drive the sliding assembly to move and make the workbench reciprocate along the length direction of the sliding assembly, so as to realize the movement of the opening adjusting module 1 and the reciprocating wire feeding machining module. The stepping motor is electrically connected with the control module 1002, so as to realize automatic control.

[0038] The sliding assembly comprises a translation slide, a screw rod and a moving slider, the screw rod is rotationally connected in the translation slide, a stepping motor is installed at one end of the translation slide, and an output shaft of the stepping motor is connected to one end of the screw rod, the moving slider is sleeved on the outer periphery of the screw rod, and the moving slider is slidingly connected in the translation slide, and a workbench is installed on the upper end of the moving slider; when the stepping motor works, the screw rod is driven to rotate, the rotation of the screw rod is converted into the linear movement of the moving slider, at the same time, the translation slide limits the moving slider to ensure the linear movement, and finally the moving slider drives the workbench to move linearly.

[0039] The control module 1002 comprises a pulse power module and a discharge and servo motion controller, wherein the discharge and servo motion controller realizes the servo feeding and back motion of the moving slide module 14 in the discharge process, and simultaneously realizes the discharge parameter adjustment of the pulse power module, and the pulse power module provides energy for the electrode wire 5 when cutting a workpiece.

[0040] The electrode wire 5 is usually a brass wire or a molybdenum wire, and can also be other reasonable materials, and the diameter and length thereof are selected according to the use of the specific device.

[0041] The opening adjusting module 1 comprises an adjusting fixed table 101, a threaded rotating shaft 102, an adjusting knob, a left adjusting slider 104 and a right adjusting slider 107, the adjusting fixed table 101 is installed on the moving slide module 14, and the upper end of the adjusting fixed table 101 is provided with an adjusting groove, the threaded rotating shaft 102 is rotationally installed in the adjusting groove, and the adjusting knob is installed at one end of the threaded rotating shaft 102, the threaded rotating shaft 102 is driven to rotate by rotating the adjusting knob, the outer periphery of the threaded rotating shaft 102 is provided with two sections of threads with opposite rotation directions, the left adjusting slider 104 and the right adjusting slider 107 are threadedly connected to the two sections of threads with opposite rotation directions respectively, and the left adjusting slider 104 and the right adjusting slider 107 are slidingly connected in the adjusting groove, so that the left adjusting slider 104 and the right adjusting slider 107 are symmetrically moved by the rotation of the threaded rotating shaft 102, that is, the left adjusting slider 104 and the right adjusting slider 107 are driven to move towards each other or away from each other, the upper end of the left adjusting slider 104 and the upper end of the right adjusting slider 107 are connected to two wire conveying units of the reciprocating wire conveying processing module respectively, and the two wire conveying units are driven to move towards each other or away from each other, the distance between the two wire conveying units is adjusted, and finally the opening size is adjusted to meet different cutting needs.

[0042] The left adjusting slider 104 and the right adjusting slider 107 are further provided with sliding grooves for sliding connection with the inner walls of the installation grooves.

[0043] The opening adjusting module 1 further comprises a middle positioning shaft 106, which is installed in the adjusting groove and is perpendicular to the threaded rotating shaft 102, the middle part of the threaded rotating shaft 102 is provided with two clamping plates, a limiting gap is formed between the two clamping plates, the middle part of the middle positioning shaft 106 is provided with a clamping groove, the threaded rotating shaft 102 can be embedded in the clamping groove, and the two clamping plates can limit the middle positioning shaft 106 in the limiting gap, so as to limit the axial direction of the threaded rotating shaft 102 through the middle positioning shaft 106, and at the same time, the middle positioning shaft 106 will not affect the rotation of the threaded rotating shaft 102.

[0044] The side wall of the adjusting fixed table 101 is provided with a locking screw 103 corresponding to the positions of the left adjusting sliding block 104 and the right adjusting sliding block 107, the locking screw 103 will not contact the left adjusting sliding block 104 and the right adjusting sliding block 107 when being loosened, so as to adjust the distance between the left adjusting sliding block 104 and the right adjusting sliding block 107 through the threaded rotating shaft 102, meet different cutting needs, and the locking screw 103 can abut against the left adjusting sliding block 104 and the right adjusting sliding block 107 when being tightened, so that the left adjusting sliding block 104 and the right adjusting sliding block 107 cannot move, and finally the positions of the left adjusting sliding block 104 and the right adjusting sliding block 107 are fixed, so as to ensure the stability during processing.

[0045] The opening adjusting module 1 further comprises two locking pressing sheets 105, which are symmetrically installed on the upper end of the adjusting fixed table 101, the upper end of the left adjusting sliding block 104 and the upper end of the right adjusting sliding block 107 are both provided with limiting steps, the two locking pressing sheets 105 can be respectively limited on the limiting steps on the two sides of the left adjusting sliding block 104 and the limiting steps on the two sides of the right adjusting sliding block 107, and are connected to the upper end face of the adjusting fixed table 101 through bolts, so as to limit the left adjusting sliding block 104 and the right adjusting sliding block 107 through the locking pressing sheets 105, and avoid the left adjusting sliding block 104 and the right adjusting sliding block 107 from being taken out of the adjusting groove.

[0046] The reciprocating wire conveying processing module comprises a left wire conveying unit, a right wire conveying unit and a waterproof telescopic shell 13. The left wire conveying unit comprises a left shell, a left wire conveying motor 7, a left coupling 19, a left wire rolling wheel 20, a left wire rolling bearing 21, a left guide wheel 22, a left wire guide bearing 23 and a left wire guide nozzle 24. The left shell is mounted on the left adjusting sliding block 104. The left wire conveying motor 7 is mounted on the upper end of the left shell through the left mounting seat 6. The output shaft of the left wire conveying motor 7 extends into the left shell and connects the left wire rolling wheel 20 through the left coupling 19 and the left wire rolling bearing 21. The left guide wheel 22 is rotatably mounted in the left shell through the left wire guide bearing 23. The left wire guide nozzle 24 is mounted on the side wall of the left shell. When the left wire conveying motor 7 works, it can drive the left wire rolling wheel 20 to rotate through the left coupling 19. With the action of the left wire rolling wheel 20, the wire can be reeled in or let out. At the same time, the left wire rolling bearing 21 can improve the stability during rotation. The left guide wheel 22 can guide the electrode wire 5 during the process of reeling in or letting out, improve the smoothness of reeling in or letting out, and realize stable wire conveying. The right wire conveying unit comprises a right shell, a right wire conveying motor 8, a right coupling 18, a right wire rolling wheel 17, a right wire rolling bearing 27, a right guide wheel 16, a right wire guide bearing 26 and a right wire guide nozzle 15. The right shell is mounted on the right adjusting sliding block 107. The right wire conveying motor 8 is mounted on the upper end of the right shell through the right mounting seat 9. The output shaft of the right wire conveying motor 8 extends into the right shell and connects the right wire rolling wheel 17 through the right coupling 18 and the right wire rolling bearing 27. The right guide wheel 16 is rotatably mounted in the right shell through the right wire guide bearing 26. The right wire guide nozzle 15 is mounted on the side wall of the right shell. The left shell and the right shell are both curved. The two ends of the waterproof telescopic shell 13 are respectively mounted on the first end of the left shell and the first end of the right shell, which plays a role in waterproofing and dustproofing. The left wire guide nozzle 24 is mounted on the second end of the left shell, and the right wire guide nozzle 15 is mounted on the second end of the right shell. When the right wire conveying motor 8 works, it can drive the right wire rolling wheel 17 to rotate through the right coupling 18. With the action of the right wire rolling wheel 17, the wire can be reeled in or let out. At the same time, the right wire rolling bearing 27 can improve the stability during rotation. The right guide wheel 16 can guide the electrode wire 5 during the process of reeling in or letting out, improve the smoothness of reeling in or letting out, and realize stable wire conveying. One end of the electrode wire 5 is fixedly wound on the left wire rolling wheel 20. The other end of the electrode wire 5 passes through the left guide wheel 22, the left wire guide nozzle 24, the right wire guide nozzle 15 and the right guide wheel 16 in sequence and is fixedly wound on the right wire rolling wheel 17. The electrode wire 5 between the left wire guide nozzle 24 and the right wire guide nozzle 15 is used to cut the workpiece to be processed 28. In the processing process, an electric spark discharge is generated between the electrode wire 5 and the workpiece to be processed 28, so as to remove the material to realize cutting, and a cutting surface 281 with obvious electric spark cutting traces is obtained, as shown in Figure 6The current and voltage waveforms of a single pulse experiment are shown, when the electrode wire 5 and the workpiece 28 to be processed generate an electric spark discharge, when the working fluid is broken down, the voltage drops rapidly, and the current rises rapidly. In actual operation, the tension of the electrode wire 5 is always within a reasonable range through the rotation of the left wire feeding motor 7 and the right wire feeding motor 8, avoiding the electrode wire 5 from being loose and separated from the left guide wheel 22 or the right guide wheel 16, or being torn off due to excessive tension, which solves the problems of in-situ processing, large rolling wire feeding device, and difficulty in reciprocating wire feeding under stable tension in the prior art.

[0047] The left shell includes a left top shell 4, a left side shell 3, and a left bottom shell 2, the left top shell 4 is encapsulated at the upper end of the left side shell 3, the left bottom shell 2 is encapsulated at the lower end of the left side shell 3, and the left top shell 4 is provided with a hole for the output shaft of the left wire feeding motor 7 to pass through, the inner wall of the left bottom shell 2 is connected with a left tensioning mechanism 25 through a spring, the left tensioning mechanism 25 can contact the electrode wire 5 on the side away from the spring, thereby automatically adjusting according to the tension change of the electrode wire 5 to improve the stability of wire feeding, that is, when the electrode wire 5 is tensioned, the left tensioning mechanism 25 can be squeezed, and the corresponding spring of the left tensioning mechanism 25 is squeezed, and when the electrode wire 5 is loose, the spring pushes the left tensioning mechanism 25 to reset, so that the left tensioning mechanism 25 can provide a certain supporting force for the electrode wire 5, avoiding short circuit and wire breakage due to excessive looseness of the electrode wire 5, and then the working fluid at the machining position is flushed through the left guide wire nozzle 24 and the right guide wire nozzle 15 with liquid injection holes; the right shell includes a right top shell 11, a right side shell 10, and a right bottom shell 12, the right top shell 11 is encapsulated at the upper end of the right side shell 10, the right bottom shell 12 is encapsulated at the lower end of the right side shell 10, and the right top shell 11 is provided with a hole for the output shaft of the right wire feeding motor 8 to pass through, the inner wall of the right bottom shell 12 is connected with a right tensioning mechanism 25 through a spring, the right tensioning mechanism 25 can contact the electrode wire 5 on the side away from the spring, thereby automatically adjusting according to the tension change of the electrode wire 5 to improve the stability of wire feeding, the right tensioning adjusting element is consistent with the left tensioning mechanism 25, and the left side shell 3 and the right side shell 10 are both provided with a working fluid interface 1001.

[0048] The wire conveying process of the embodiment is as follows: when conveying the wire forward, the left wire conveying motor 7 drives the left wire roller 20 to rotate forward through the left coupling 19, and the electrode wire 5 is wound on the left wire roller 20 turn by turn; the right wire conveying motor 8 drives the right wire roller 17 to rotate forward through the right coupling 18, and the electrode wire 5 is gradually released by adjusting the rotating speed of the left wire conveying motor 7; during the wire conveying process, the wire diameter change of the electrode wire 5 wound on the left wire roller 20 and the right wire roller 17 will cause the change of the wire tension, and the wire tension of the electrode wire 5 is automatically adjusted under the auxiliary action of the tensioning top block on the left tensioning mechanism 25 and the tensioning top block on the right tensioning mechanism 25; the speed of the electrode wire 5 released by the left wire conveying motor 7 is continuously adjusted, and the electrode wire 5 keeps the constant conveying position under the action of the left guide wheel 22, the left guide nozzle 24, the right guide nozzle 15 and the right guide wheel 16; when the electrode wire 5 on the right wire roller 17 is released to the limit length, the master-slave relationship between the right wire roller 17 and the left wire roller 20 is changed, the right wire roller 17 rotates reversely to wind the wire, and the left wire roller 20 cooperates to release the wire, so that the stable wire conveying is realized, and the structure of the wire conveying is more compact and simple.

[0049] Embodiment two

[0050] As shown in Figures 1-6 , the embodiment provides a wire electrical discharge machining method, which uses the wire electrical discharge machining device in embodiment one, and includes the following steps:

[0051] S1. Moving the wire electrical discharge machining device to the installation position, assembling the wire electrical discharge machining device, and then connecting one end of the machining pulse power source in the control module 1002 to the workpiece 28 to be machined; specifically, the wire electrical discharge machining device is driven by a manual mode or an external mechanical equipment to reach the installation position, the movable slide module 14 is installed at a reasonable position around the workpiece 28 to be machined, and one end of the machining pulse power source in the control module 1002 is connected to the workpiece 28 to be machined;

[0052] S2. Adjusting the opening size of the reciprocating wire conveying machining module through the opening adjusting module 1 to adapt to different use scenes and use requirements; specifically, the opening size of the reciprocating wire conveying machining module is adjusted by manually or automatically adjusting the opening adjusting module 1;

[0053] S3. Controlling the movable slide module 14 to move and drive the reciprocating wire conveying machining module to find the machining starting position;

[0054] S4. Turn on the machining pulse power source through the control module 1002, control the servo movement of the moving slide module 14, and at the same time, control the working liquid to flow in through the control module 1002, the working liquid enters the inside of the reciprocating wire feeding machining module through the working liquid interface 1001, and then is flushed to the machining position from the liquid flushing holes around the left wire guide nozzle 24 and the right wire guide nozzle 15;

[0055] S5. Perform discharge cutting according to the set machining program until the machining is completed;

[0056] S6. The wire electrical discharge machining device is disassembled from the installation position, transported to the next position to be machined, and the steps S1-S5 are repeated until the device is removed after completing all the machining tasks.

[0057] The principles and implementation manners of the present application are described by using specific examples in the present application, and the above examples are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the present application. In conclusion, the content of the present description should not be understood as a limitation of the present application.

Claims

1. An electric discharge wire cutting apparatus characterized by comprising: The application relates to an opening adjusting module, a control module, a moving sliding table module and a reciprocating wire conveying and processing module, wherein the moving sliding table module is used for attaching to a workpiece to be processed or an auxiliary tool, the opening adjusting module is installed on the moving sliding table module, the moving sliding table module can drive the opening adjusting module to move linearly, the reciprocating wire conveying and processing module is installed on the opening adjusting module, the opening adjusting module can adjust the opening size of the reciprocating wire conveying and processing module, the reciprocating wire conveying and processing module can wind and unwind an electrode wire, the electrode wire extends out of and is limited in the opening of the reciprocating wire conveying and processing module, and the electrode wire can cut a workpiece to be processed at the opening of the reciprocating wire conveying and processing module. The opening adjusting module comprises an adjusting fixed table, a threaded rotating shaft, an adjusting knob, a left adjusting sliding block and a right adjusting sliding block, the adjusting fixed table is installed on the moving sliding table module, the upper end of the adjusting fixed table is provided with an adjusting groove, the threaded rotating shaft is rotatably installed in the adjusting groove, the adjusting knob is installed at one end of the threaded rotating shaft, the outer periphery of the threaded rotating shaft is provided with two threads with opposite rotation directions, the left adjusting sliding block and the right adjusting sliding block are threadedly connected to the two threads with opposite rotation directions respectively, and the upper ends of the left adjusting sliding block and the right adjusting sliding block are connected to two wire conveying units of the reciprocating wire conveying and processing module respectively and can drive the two wire conveying units to move towards each other or away from each other.

2. The wire electrical discharge machining apparatus according to claim 1, characterized by: The moving sliding table module comprises a stepping motor, a sliding assembly and a workbench, the workbench is installed on the sliding assembly, the opening adjusting module is installed on the workbench, the stepping motor is installed at one end of the sliding assembly, the stepping motor can drive the sliding assembly to act and make the workbench reciprocate along the length direction of the sliding assembly, and the stepping motor is electrically connected to the control module.

3. The wire-cut electrical discharge machining apparatus according to claim 2, characterized by: The sliding assembly comprises a translation sliding table, a lead screw and a moving sliding block, the lead screw is rotatably connected in the translation sliding table, the stepping motor is installed at one end of the translation sliding table, the output shaft of the stepping motor is connected to one end of the lead screw, the moving sliding block is sleeved on the outer periphery of the lead screw, and the moving sliding block is slidably connected in the translation sliding table, and the workbench is installed on the upper end of the moving sliding block.

4. The wire electrical discharge machining apparatus according to claim 1, characterized by: The opening adjusting module further comprises a middle positioning shaft, the middle positioning shaft is installed in the adjusting groove, the middle positioning shaft is perpendicular to the threaded rotating shaft, the middle part of the threaded rotating shaft is provided with two clamping plates, a limiting gap is formed between the two clamping plates, the middle part of the middle positioning shaft is provided with a clamping groove, the threaded rotating shaft can be embedded in the clamping groove, and the two clamping plates can limit the middle positioning shaft in the limiting gap.

5. The wire electrical discharge machining apparatus according to claim 1, characterized by: The side wall of the adjusting fixed table is provided with a locking screw corresponding to the position of the left adjusting slider and the right adjusting slider, the locking screw is loosened to adjust the distance between the left adjusting slider and the right adjusting slider through the threaded rotating shaft, and the locking screw is tightened to abut against the left adjusting slider and the right adjusting slider respectively, so that the positions of the left adjusting slider and the right adjusting slider are fixed.

6. The wire electrical discharge machining apparatus according to claim 1, characterized by: The opening adjusting module further comprises two locking pressing plates, the two locking pressing plates are symmetrically installed on the upper end of the adjusting fixed table, the upper end of the left adjusting slider and the upper end of the right adjusting slider are respectively provided with limiting steps, the two locking pressing plates are respectively limited on the limiting steps on the two sides of the left adjusting slider and the limiting steps on the two sides of the right adjusting slider, and the two locking pressing plates are connected to the upper end face of the adjusting fixed table through bolts.

7. The wire electrical discharge machining apparatus according to claim 1, characterized by: The reciprocating wire conveying processing module comprises a left wire conveying unit, a right wire conveying unit and a waterproof telescopic shell, the left wire conveying unit comprises a left shell, a left wire conveying motor, a left coupling, a left wire rolling wheel, a left wire rolling bearing, a left guide wheel, a left wire guide bearing and a left wire guide nozzle, the left shell is installed on the left adjusting slider, the left wire conveying motor is installed on the upper end of the left shell, the output shaft of the left wire conveying motor extends into the left shell and connects the left wire rolling wheel through the left coupling and the left wire rolling bearing, the left guide wheel is rotatably installed in the left shell through the left wire guide bearing, and the left wire guide nozzle is installed on the side wall of the left shell; the right wire conveying unit comprises a right shell, a right wire conveying motor, a right coupling, a right wire rolling wheel, a right wire rolling bearing, a right guide wheel, a right wire guide bearing and a right wire guide nozzle, the right shell is installed on the right adjusting slider, the right wire conveying motor is installed on the upper end of the right shell, the output shaft of the right wire conveying motor extends into the right shell and connects the right wire rolling wheel through the right coupling and the right wire rolling bearing, the right guide wheel is rotatably installed in the right shell through the right wire guide bearing, and the right wire guide nozzle is installed on the side wall of the right shell; the left shell and the right shell are curved, and the two ends of the waterproof telescopic shell are respectively installed on the first end of the left shell and the first end of the right shell, the left wire guide nozzle is installed on the second end of the left shell, and the right wire guide nozzle is installed on the second end of the right shell; one end of the electrode wire is fixedly wound on the left wire rolling wheel, the other end of the electrode wire sequentially passes through the left guide wheel, the left wire guide nozzle, the right wire guide nozzle and the right guide wheel, and is fixedly wound on the right wire rolling wheel, and the electrode wire between the left wire guide nozzle and the right wire guide nozzle is used for cutting the workpiece to be processed.

8. The wire electrical discharge machining apparatus according to claim 7, characterized by: The left shell comprises a left top shell, a left side shell and a left bottom shell, the left top shell is encapsulated at the upper end of the left side shell, the left bottom shell is encapsulated at the lower end of the left side shell, and the left top shell is provided with a hole for the output shaft of the left wire conveying motor to pass through, the inner wall of the left bottom shell is connected with a left tensioning mechanism through a spring, and the left tensioning mechanism can contact the electrode wire at the side away from the spring; the right shell comprises a right top shell, a right side shell and a right bottom shell, the right top shell is encapsulated at the upper end of the right side shell, the right bottom shell is encapsulated at the lower end of the right side shell, and the right top shell is provided with a hole for the output shaft of the right wire conveying motor to pass through, the inner wall of the right bottom shell is connected with a right tensioning mechanism through a spring, and the right tensioning mechanism can contact the electrode wire at the side away from the spring, and the left side shell and the right side shell are both provided with a working liquid interface.

9. An electro-discharge wire cutting method, characterized by: The use of the wire electrical discharge machining device according to any one of claims 1-8 comprises the following steps: S1. Moving the wire electrical discharge machining device to the installation position, and realizing the assembly of the wire electrical discharge machining device, then connecting one end of the machining pulse power source in the control module to the workpiece to be machined; S2. Adjusting the opening size of the reciprocating wire conveying machining module through the opening adjusting module to adapt to different use scenarios and use requirements; S3. Controlling the movement of the moving slide table module through the control module, and driving the reciprocating wire conveying machining module to find the processing starting position; S4. Controlling the machining pulse power source to be turned on through the control module, and controlling the moving slide table module to perform servo motion, at the same time, controlling the working liquid to be introduced through the control module, and the working liquid enters the inside of the reciprocating wire conveying machining module through the working liquid interface, and then is flushed to the machining part from the liquid flushing holes around the left and right wire guide nozzles; S5. Discharge cutting according to the set machining program until the machining is completed; S6. Removing the wire electrical discharge machining device from the installation position, transporting it to the next position to be machined, and repeating S1-S5 until all machining tasks are completed and then withdrawing.

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