Electrical discharge machining (EDM) equipment and machining method without altered layer

Abstract

This invention provides a composite electrical discharge machining (EDM) device and method for machining without a modified layer, relating to the technical field of machining devices. The machining device includes an adapter plate, a first drive assembly, a W-axis mechanism, an electrode wire, and a drill bit mechanism. The first drive assembly is connected to the adapter plate and is drively connected to the W-axis mechanism. The first drive assembly can drive the W-axis mechanism to move vertically. The W-axis mechanism is connected to the electrode wire and can drive the electrode wire to rotate, performing EDM on the workpiece to form microholes. The drill bit mechanism is connected to the adapter plate and located below the W-axis mechanism. The drill bit mechanism can drill through microholes with a modified layer, removing the modified layer, ensuring hole shape accuracy, and improving microhole quality. The electrode wire passes through the drill bit mechanism with a gap between them. The drill bit mechanism, sleeved outside the electrode wire, can guide the electrode wire, thereby effectively reducing the horizontal offset of the electrode wire.

Description

Technical Field

[0001] This invention relates to the field of machining equipment technology, and in particular to a composite machining equipment and method for electrical discharge drilling without alteration layer. Background Technology

[0002] With the advancement of modern industrial technology, high-precision deep micro-hole machining technology is required for many high-precision and complex parts. Deep micro-hole structures have been widely applied and promoted in industries such as precision instruments, aerospace, medical devices, and tire molds. However, the machining of high-precision deep micro-holes has always been one of the challenges in the field of machining.

[0003] Electrical discharge machining (EDM) technology has significant advantages in machining micro-holes because it is a non-contact machining process and has no obvious macroscopic force.

[0004] The applicant has discovered at least the following technical problems in the prior art: during the application of electrical discharge machining technology, a deteriorated layer is generated on the surface of the micropores, which is not easy to remove, resulting in poor accuracy of the machined hole shape and seriously affecting the quality of the micropores. Summary of the Invention

[0005] The purpose of this invention is to provide a composite machining apparatus for electrical discharge drilling without a modified layer, thereby solving the technical problem in the prior art where the modified layer generated on the surface of microholes during electrical discharge machining is difficult to remove. The various technical effects of the preferred solutions among the many technical solutions provided by this invention are detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A composite electrical discharge machining (EDM) device without altered layer includes an adapter plate, a first drive assembly, a W-axis mechanism, an electrode wire, and a drill bit mechanism. The first drive assembly is connected to the adapter plate and is drively connected to the W-axis mechanism. The first drive assembly can drive the W-axis mechanism to move in the vertical direction. The W-axis mechanism is connected to the electrode wire and can drive the electrode wire to rotate. The drill bit mechanism is connected to the adapter plate and is located below the W-axis mechanism. The electrode wire passes through the drill bit mechanism and there is a gap between the two.

[0008] Preferably, the first drive assembly includes a motor base, a first motor, a coupling, a lead screw structure, and a nut seat. The motor base is connected to the adapter plate. The first motor is connected to the motor base and is driven by the coupling. The coupling is driven by the lead screw structure. The lead screw structure is driven by the nut seat. The nut seat is connected to the W-axis mechanism.

[0009] Preferably, the W-axis mechanism includes a W-axis support, a first bearing, a core tube, and a second drive assembly. The W-axis support is connected to the first drive assembly. The outer ring of the first bearing is connected to the W-axis support, and its inner ring is connected to the core tube. The second drive assembly is connected to the W-axis support and is drively connected to the core tube. The core tube is sleeved on the outside of the electrode wire.

[0010] Preferably, the second drive assembly includes a fixed support, a second motor, a first pulley, a second pulley, and a first conveyor belt. The fixed support is connected to the W-axis support, the second motor is connected to the fixed support, the output shaft of the second motor is connected to the first pulley, the second pulley is detachably connected to the core tube, and the first conveyor belt is connected to both the first pulley and the second pulley.

[0011] Preferably, the drill bit mechanism includes an outer bearing support, a second bearing, a rotating shaft, a drill bit body, and a third drive assembly. The outer bearing support is connected to the adapter plate. The outer ring of the second bearing is connected to the outer bearing support, and its inner ring is connected to the rotating shaft. The third drive assembly is connected to the outer bearing support and is drively connected to the rotating shaft. The drill bit body is connected to the rotating shaft. The electrode wire passes through the rotating shaft and the drill bit body in sequence with a gap between them.

[0012] Preferably, the third drive assembly includes a third motor, a third pulley, a fourth pulley, and a second conveyor belt. The third motor is connected to the outer support of the bearing, the output shaft of the third motor is connected to the third pulley, the fourth pulley is connected to the rotating shaft, and the second conveyor belt is connected to both the third pulley and the fourth pulley.

[0013] Preferably, it also includes limit switches, both of which are connected to the adapter plate and are respectively located at the two extreme positions of the W-axis mechanism relative to the adapter plate in the vertical direction.

[0014] Preferably, the second pulley includes a connecting part and a locking part connected together. The connecting part is drivenly connected to the first conveyor belt, and the locking part is detachably connected to the core tube by a locking bolt.

[0015] Preferably, the adapter plate is connected to the machine tool's Z-axis mechanism, and the machine tool's Z-axis mechanism can drive the adapter plate to move relative to it in the vertical direction.

[0016] A method for combined electrical discharge drilling and machining without altered layers includes the following specific steps:

[0017] S1. Move the workpiece to the bottom of the processing device, start the machine tool Z-axis mechanism to drive the adapter plate to move down to the set height, start the W-axis mechanism to drive the electrode wire to rotate;

[0018] S2. Start the first drive component to drive the W-axis mechanism and the electrode wire to move downward. After the bottom end of the electrode wire contacts the workpiece, the W-axis mechanism and the electrode wire stop moving downward and move upward to a set height.

[0019] S3. The electrode wire is energized to perform electrical discharge machining on the workpiece, forming micropores on the workpiece;

[0020] S4. When the electrode wire is de-energized, the W-axis mechanism stops driving the electrode wire to rotate, and the first drive assembly is activated to drive the W-axis mechanism and the electrode wire to move upward, so that the bottom end of the electrode wire is above the bottom end of the drill bit mechanism.

[0021] S5. Start the Z-axis mechanism of the machine tool to drive the adapter plate to move downward. The drill mechanism contacts the workpiece to drill and remove the modified layer at the micropore. After drilling, a micropore without the modified layer is formed.

[0022] S6. Start the Z-axis mechanism of the machine tool, drive the adapter plate to move upward to the set height, the workpiece is moved away, the next workpiece moves to the bottom of the processing device, and repeat the above steps.

[0023] The beneficial effects of the present invention are as follows: by providing a W-axis mechanism, which is connected to the electrode wire, the W-axis mechanism drives the electrode wire to perform electrical discharge machining on the workpiece when energized, thereby forming microholes on the workpiece.

[0024] By incorporating a drill mechanism, after the electrode wire performs electrical discharge machining on the workpiece, the drill mechanism can drill the microholes with modified layers generated by the electrical discharge machining, remove the modified layers, thereby ensuring the accuracy of the hole shape and effectively improving the quality of the microholes.

[0025] By passing the electrode wire through the drill bit mechanism with a gap between them, the drill bit mechanism, which is fitted over the electrode wire, can guide the electrode wire due to its relatively long length in the vertical direction, thereby effectively reducing the deviation of the electrode wire in the horizontal direction. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a structural diagram of the present invention;

[0028] Figure 2 This is a structural diagram of the W-axis mechanism, electrode wire, and drill bit mechanism of the present invention;

[0029] Figure 3 This is a structural diagram of the W-axis mechanism of the present invention;

[0030] 1. Adapter board in the diagram;

[0031] 2. First drive assembly; 21. Motor mount; 22. First motor; 23. Coupling; 24. Lead screw structure; 25. Nut seat;

[0032] 3. W-axis mechanism; 31. W-axis support; 32. Core tube; 33. Second drive assembly; 331. Fixed support; 332. Second motor; 333. First pulley; 334. Second pulley; 3341. Connecting part; 3342. Locking part; 335. Conveyor belt;

[0033] 4. Electrode wire;

[0034] 5. Drill bit mechanism; 51. Bearing outer support; 52. Rotary shaft; 53. Drill bit body; 54. Third drive assembly; 541. Third motor; 542. Third pulley; 543. Fourth pulley; 544. Second conveyor belt;

[0035] 6. Limit switches. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0037] In the description of this invention, it should be understood that the terms "center," "side," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0038] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] Reference Figures 1 to 3 The present invention provides a composite machining device for electrical discharge drilling without alteration layer, comprising an adapter plate 1, a first drive assembly 2, a W-axis mechanism 3, an electrode wire 4, and a drill bit mechanism 5;

[0040] The adapter plate 1 is connected to the machine tool Z-axis mechanism. The machine tool Z-axis mechanism can drive the adapter plate 1 to move relatively in the vertical direction. Since the rest of the structure of the non-modified layer electrical discharge drilling composite machining device relies on the adapter plate 1, the movement of the adapter plate 1 can drive the overall structure of the non-modified layer electrical discharge drilling composite machining device to move relatively in the vertical direction. The machine tool Z-axis mechanism is a relatively conventional existing technology, so it will not be described in further detail, nor is it shown in the attached drawings.

[0041] The first drive component 2 is connected to the adapter plate 1 and is connected to the W-axis mechanism 3 in a transmission connection. After the first drive component 2 is started, it can drive the W-axis mechanism 3 to move in the vertical direction.

[0042] The W-axis mechanism 3 is connected to the electrode wire 4. The W-axis mechanism 3 can clamp the electrode wire 4 and drive the electrode wire 4 to move synchronously in the vertical direction when connected. The W-axis mechanism 3 can be connected to an external circuit to energize the electrode wire 4, thereby performing electrical discharge machining on the workpiece in the energized state to form microholes on the workpiece. The W-axis mechanism 3 can drive the electrode wire 4 to rotate, and the rotating electrode wire 4 can make the machined microholes smoother during the machining process.

[0043] The drill bit mechanism 5 is connected to the adapter plate 1 and located below the W-axis mechanism 3. The drill bit mechanism 5 and the adapter plate 1 can maintain synchronous movement. After the electrode wire 4 performs electrical discharge machining on the workpiece, the drill bit mechanism 5 can drill the micro-hole with the modified layer generated by the electrical discharge machining, remove the modified layer, thereby ensuring the hole shape accuracy and effectively improving the quality of the micro-hole.

[0044] The electrode wire 4 passes through the drill bit mechanism 5 and there is a gap between them. Since the electrode wire 4 has a long length in the vertical direction, the drill bit mechanism 5, which is sleeved on the outside of the electrode wire 4, can guide the electrode wire 4, thereby effectively reducing the deviation of the electrode wire 4 in the horizontal direction.

[0045] As an optional implementation, the first drive assembly 2 includes a motor base 21, a first motor 22, a coupling 23, a lead screw structure 24, and a nut seat 25. The motor base 21 is connected to the adapter plate 1, preferably by bolts for easy assembly and disassembly. The first motor 22 is connected to the motor base 21, again preferably by bolts for easy assembly and disassembly. The first motor 22 is driven by the coupling 23, which is driven by the lead screw structure 24, which is driven by the nut seat 25. After the first motor 22 is started, it can... The lead screw body in the lead screw structure 24 is rotated by the coupling 23. The rotation of the lead screw body can drive the nut seat 25 to move in the vertical direction. The nut seat 25 is connected to the W-axis mechanism 3. The movement of the nut seat 25 can drive the W-axis mechanism 3 to move synchronously. Through the above transmission connection, the relative position of the W-axis mechanism 3 in the vertical direction can be adjusted. Since the W-axis mechanism 3 can drive the electrode wire 4 to move synchronously in the vertical direction, the relative position of the electrode wire 4 in the vertical direction can also be adjusted, thus realizing the supply of the electrode wire 4.

[0046] As an optional implementation, the W-axis mechanism 3 includes a W-axis support 31, a first bearing, a core tube 32, and a second drive assembly 33. The W-axis support 31 is connected to the first drive assembly 2, preferably by bolts, so that the W-axis support 31 is connected to the nut seat 25. The movement of the nut seat 25 can drive the W-axis support 31 to move synchronously.

[0047] The outer ring of the first bearing is connected to the W-axis support 31 and its inner ring is connected to the core tube 32. The first bearing achieves relative positioning of the core tube 32 and allows the core tube 32 to rotate relative to the W-axis support 31. The structure and application principle of the first bearing are relatively conventional existing technologies, so they will not be described in further detail or shown in the attached drawings.

[0048] The second drive assembly 33 is connected to the W-axis support 31 and is connected to the core tube 32 in a transmission manner. After the second drive assembly 33 is started, it can drive the core tube 32 to rotate relative to it. The core tube 32 is sleeved on the outside of the electrode wire 4. The bottom end of the core tube 32 can clamp the electrode wire 4 by clamping, thereby maintaining the synchronous movement of the core tube 32 and the electrode wire 4.

[0049] As an optional implementation, the second drive assembly 33 includes a fixed support 331, a second motor 332, a first pulley 333, a second pulley 334, and a first conveyor belt 335. The fixed support 331 is connected to the W-axis support 31, preferably by bolts for easy assembly and disassembly. The second motor 332 is connected to the fixed support 331, preferably by bolts for easy assembly and disassembly. The output shaft of the second motor 332 is connected to the first pulley 333, and the second pulley 334 is detachably connected to the core tube 32. Next, the first conveyor belt 335 is connected to the first pulley 333 and the second pulley 334 respectively. After the second motor 332 is started, it can drive the first pulley 333 to rotate. The rotation of the first pulley 333 can drive the first conveyor belt 335 to drive the second pulley 334 to rotate. The rotation of the second pulley 334 can drive the core tube 32 to rotate. Since the core tube 32 and the electrode wire 4 move synchronously, the electrode wire 4 is rotated. The rotating electrode wire 4 can make the processed microholes smoother during the processing.

[0050] As an optional implementation, the second pulley 334 includes a connecting part 3341 and a locking part 3342 connected together. The connection is preferably an integral connection to form a strong connection. The connecting part 3341 is connected to the first conveyor belt 335 for transmission. The locking part 3342 is detachably connected to the core tube 32 by locking bolts. The locking part 3342 locks the core tube 32, realizing the synchronous movement of the second pulley 334 and the core tube 32. The detachable connection method facilitates the assembly and disassembly of the second pulley 334 and the core tube 32.

[0051] As an optional implementation, the drill bit mechanism 5 includes an outer bearing support 51, a second bearing, a rotating shaft 52, a drill bit body 53, and a third drive assembly 54. The outer bearing support 51 is connected to the adapter plate 1, and the connection here is preferably a bolt connection, which makes disassembly and assembly convenient.

[0052] The outer ring of the second bearing is connected to the outer bearing support 51 and its inner ring is connected to the rotating shaft 52. The relative positioning of the rotating shaft 52 is achieved through the second bearing, and the rotating shaft 52 can rotate relative to the outer bearing support 51. The structure and application principle of the second bearing itself are relatively conventional existing technologies, so they will not be described in further detail or shown in the attached drawings.

[0053] The third drive assembly 54 is connected to the outer support of the bearing 51 and is connected to the rotating shaft 52 for transmission. After the third drive assembly 54 is started, it can drive the rotating shaft 52 to rotate relative to each other. The drill bit body 53 is connected to the rotating shaft 52. The rotation of the rotating shaft 52 can drive the drill bit body 53 to rotate. The electrode wire 4 passes through the rotating shaft 52 and the drill bit body 53 in sequence with a gap. The rotating shaft 52 and the drill bit body 53, which are sleeved on the outside of the electrode wire 4, can guide the electrode wire 4, thereby effectively reducing the horizontal offset of the electrode wire 4.

[0054] As an optional implementation, the third drive assembly 54 includes a third motor 541, a third pulley 542, a fourth pulley 543, and a second conveyor belt 544. The third motor 541 is connected to the outer bearing support 51, preferably by bolts for easy assembly and disassembly. The output shaft of the third motor 541 is connected to the third pulley 542, and the fourth pulley 543 is connected to the rotating shaft 52. The second conveyor belt 544 is connected to both the third pulley 542 and the fourth pulley 543. After the third motor 541 is started, it can drive... The rotation of the third pulley 542 drives the second conveyor belt 544, which in turn drives the fourth pulley 543 to rotate. The rotation of the fourth pulley 543 drives the rotating shaft 52 to rotate. Since the rotating shaft 52 moves synchronously with the drill body 53, the drill body 53 rotates. After the electrode wire 4 performs electrical discharge machining on the workpiece, the rotating drill body 53 can drill the microhole, removing the altered layer on the microhole, thus ensuring the accuracy of the hole shape and effectively improving the quality of the microhole.

[0055] As an optional implementation, it also includes limit switches 6. Both limit switches 6 are connected to the adapter plate 1 and are respectively located at the two extreme positions of the W-axis mechanism 3 in the vertical direction relative to the adapter plate 1. When the W-axis mechanism 3 moves to the corresponding position of each limit switch 6, it can trigger the limit switch 6, thereby stopping the first drive component 2 from operating.

[0056] This invention also provides a method for combined electrical discharge drilling and machining without a modified layer, comprising the following specific steps:

[0057] S1. Move the workpiece to the bottom of the processing device, start the machine tool Z-axis mechanism, drive the adapter plate 1 to move down to the set height, start the W-axis mechanism 3, and drive the electrode wire 4 to rotate;

[0058] During processing, the workpiece is mostly transported by an external conveyor belt to the bottom of the non-deteriorated layer electrical discharge machining composite device. After the external sensor determines that the workpiece has moved to the designated position, it can start the machine tool Z-axis mechanism. The machine tool Z-axis mechanism can drive the adapter plate 1 to move downward to the set height. The adapter plate 1 also drives the other structures of the machining device to move downward. The set height is preferably a small distance from the upper surface of the workpiece, forming a coarse adjustment in the stroke of the electrode wire 4 moving towards the workpiece. After the adjustment is in place, the W-axis mechanism 3 is started. The W-axis mechanism 3 can drive the electrode wire 4 to rotate. The rotating electrode wire 4 can make the machined microholes smoother during the processing.

[0059] S2. Start the first drive component 2, which drives the W-axis mechanism 3 and the electrode wire 4 to move downward. After the bottom end of the electrode wire 4 contacts the workpiece, the W-axis mechanism 3 and the electrode wire 4 stop moving downward and move upward to the set height.

[0060] Here, the first drive component 2 can drive the W-axis mechanism 3 and the electrode wire 4 to move downward, forming a fine adjustment in the stroke of the electrode wire 4 moving towards the workpiece, thus cooperating with the coarse adjustment in step S1 above to form a coordinated adjustment of coarse and fine adjustment. The electrode wire 4 continues to move downward until its bottom end contacts the upper surface of the workpiece. At this time, the W-axis mechanism 3 and the electrode wire 4 no longer move downward, but move in the opposite direction to the set height. Since electrical discharge machining is a non-contact machining method, this setting can leave a working space that is convenient for the electrode wire 4 to perform electrical discharge machining. The set height here is the height of the working space, and the set height is preferably between 0.2mm and 0.5mm.

[0061] S3. Electrode wire 4 is energized to perform electrical discharge machining on the workpiece, forming micropores on the workpiece;

[0062] The W-axis mechanism 3 can be connected to an external circuit, and because it is electrically connected to the electrode wire 4, the electrode wire 4 is energized, thereby performing electrical discharge machining on the workpiece in the energized state, forming micropores on the workpiece, and a modified layer will be formed on the surface of the micropores formed here.

[0063] S4. When the electrode wire 4 is de-energized, the W-axis mechanism 3 stops driving the electrode wire 4 to rotate, and the first drive assembly 2 is activated, which drives the W-axis mechanism 3 and the electrode wire 4 to move upward, so that the bottom end of the electrode wire 4 is above the bottom end of the drill bit mechanism 5.

[0064] After the micro-holes are generated in step S3, the electrode wire 4 is de-energized, and the W-axis mechanism 3 also stops driving the electrode wire 4, causing the electrode wire 4 to stop rotating. At the same time, the first drive assembly 2 can be activated to drive the W-axis mechanism 3 and the electrode wire 4 to move upward, so that the bottom end of the electrode wire 4 is above the bottom end of the drill bit mechanism 5. By operating in this way, the electrode wire 4 is lifted upward, so that the drill bit mechanism 5 becomes the structure located at the bottom of the structure above the workpiece, providing working space for the drilling operation of the drill bit mechanism 5 as described below.

[0065] S5. Start the machine tool Z-axis mechanism, drive the adapter plate 1 to move downward, and the drill mechanism 5 contacts the workpiece to drill to remove the modified layer at the micro-hole. After drilling, a micro-hole without the modified layer is formed.

[0066] The machine tool's Z-axis mechanism can drive the adapter plate 1 to move downwards, thereby driving the drill bit mechanism 5 to move downwards. After the rotating drill bit mechanism 5 contacts the workpiece, it rotates and moves downwards at the same time to drill the micro-hole, remove the altered layer at the micro-hole, and further enlarge the size of the micro-hole so that the micro-hole reaches the set diameter, thereby ensuring the hole shape accuracy and effectively improving the quality of the micro-hole.

[0067] S6. Start the machine tool's Z-axis mechanism to move the adapter plate 1 upward to the set height. The workpiece is moved away, and the next workpiece is moved to the bottom of the processing device. Repeat the above steps.

[0068] The micropores produced by the above method do not have a modified layer, and the hole walls are smoother, effectively ensuring the hole shape accuracy and improving the quality of the micropores, thus realizing the combined machining of electrical discharge drilling.

[0069] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for combined electrical discharge drilling and machining without a modified layer, characterized in that, It is applied to electrical discharge machining (EDM) systems without a modified layer. The non-modified layer electrical discharge machining composite device includes a transition plate (1), a first drive assembly (2), a W-axis mechanism (3), an electrode wire (4), and a drill bit mechanism (5). The first drive assembly (2) is connected to the transition plate (1) and is driven to the W-axis mechanism (3). The first drive assembly (2) can drive the W-axis mechanism (3) to move in the vertical direction. The W-axis mechanism (3) is connected to the electrode wire (4) and can drive the electrode wire (4) to rotate. The drill bit mechanism (5) is connected to the transition plate (1) and is located below the W-axis mechanism (3). The electrode wire (4) passes through the drill bit mechanism (5) and there is a gap between them. The transition plate (1) is connected to the machine tool Z-axis mechanism. The machine tool Z-axis mechanism can drive the transition plate (1) to move relative to it in the vertical direction. The specific steps include the following: S1. Move the workpiece to the bottom of the processing device, start the machine tool Z-axis mechanism, drive the adapter plate (1) to move down to the set height, start the W-axis mechanism (3), and drive the electrode wire (4) to rotate; S2. Start the first drive component (2) to drive the W-axis mechanism (3) and the electrode wire (4) to move downward. After the bottom end of the electrode wire (4) contacts the workpiece, the W-axis mechanism (3) and the electrode wire (4) stop moving downward and move upward to the set height. S3. The electrode wire (4) is energized to perform electrical discharge machining on the workpiece, forming micropores on the workpiece; S4. The electrode wire (4) is de-energized, the W-axis mechanism (3) stops driving the electrode wire (4) to rotate, and the first drive assembly (2) is started, driving the W-axis mechanism (3) and the electrode wire (4) to move upward, so that the bottom end of the electrode wire (4) is above the bottom end of the drill bit mechanism (5); S5. Start the Z-axis mechanism of the machine tool, drive the adapter plate (1) to move downward, and the drill mechanism (5) contacts the workpiece to drill to remove the altered layer at the micro-hole. After drilling, a micro-hole without altered layer is formed. S6. Start the Z-axis mechanism of the machine tool, drive the adapter plate (1) to move upward to the set height, the workpiece is moved away, the next workpiece moves to the bottom of the processing device, and repeat the above steps.

2. The non-modified layer electrical discharge drilling composite machining method according to claim 1, characterized in that, The first drive assembly (2) includes a motor base (21), a first motor (22), a coupling (23), a lead screw structure (24), and a nut seat (25). The motor base (21) is connected to the adapter plate (1). The first motor (22) is connected to the motor base (21) and is driven by the coupling (23). The coupling (23) is driven by the lead screw structure (24). The lead screw structure (24) is driven by the nut seat (25). The nut seat (25) is connected to the W-axis mechanism (3).

3. The non-modified layer electrical discharge drilling composite machining method according to claim 1, characterized in that, The W-axis mechanism (3) includes a W-axis support (31), a first bearing, a core tube (32), and a second drive assembly (33). The W-axis support (31) is connected to the first drive assembly (2). The outer ring of the first bearing is connected to the W-axis support (31), and its inner ring is connected to the core tube (32). The second drive assembly (33) is connected to the W-axis support (31) and is drivenly connected to the core tube (32). The core tube (32) is sleeved on the outside of the electrode wire (4).

4. The non-modified layer electrical discharge drilling composite machining method according to claim 3, characterized in that, The second drive assembly (33) includes a fixed support (331), a second motor (332), a first pulley (333), a second pulley (334), and a first conveyor belt (335). The fixed support (331) is connected to the W-axis support (31), the second motor (332) is connected to the fixed support (331), the output shaft of the second motor (332) is connected to the first pulley (333), the second pulley (334) is detachably connected to the core tube (32), and the first conveyor belt (335) is connected to the first pulley (333) and the second pulley (334) respectively.

5. The non-modified layer electrical discharge drilling composite machining method according to claim 1, characterized in that, The drill bit mechanism (5) includes an outer bearing support (51), a second bearing, a rotating shaft (52), a drill bit body (53), and a third drive assembly (54). The outer bearing support (51) is connected to the adapter plate (1). The outer ring of the second bearing is connected to the outer bearing support (51), and its inner ring is connected to the rotating shaft (52). The third drive assembly (54) is connected to the outer bearing support (51) and is driven by the rotating shaft (52). The drill bit body (53) is connected to the rotating shaft (52). The electrode wire (4) passes through the rotating shaft (52) and the drill bit body (53) in sequence with a gap.

6. The non-modified layer electrical discharge drilling composite machining method according to claim 5, characterized in that, The third drive assembly (54) includes a third motor (541), a third pulley (542), a fourth pulley (543), and a second conveyor belt (544). The third motor (541) is connected to the outer bearing support (51). The output shaft of the third motor (541) is connected to the third pulley (542). The fourth pulley (543) is connected to the rotating shaft (52). The second conveyor belt (544) is connected to the third pulley (542) and the fourth pulley (543) respectively.

7. The non-modified layer electrical discharge drilling composite machining method according to claim 1, characterized in that, It also includes limit switches (6), both of which are connected to the adapter plate (1) and are respectively located at the two extreme positions of the W-axis mechanism (3) in the vertical direction relative to the adapter plate (1).

8. The non-modified layer electrical discharge drilling composite machining method according to claim 4, characterized in that, The second pulley (334) includes a connecting part (3341) and a locking part (3342) connected to each other. The connecting part (3341) is connected to the first conveyor belt (335) for transmission, and the locking part (3342) is detachably connected to the core tube (32) by a locking bolt.

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