Electro-discharge wire-cut machine for machining disc-shaped porous parts

Abstract

The application discloses a wire-cut electrical discharge machine for machining disc-shaped porous parts, comprising a workbench, a center column, a rotating device, a plurality of wire rack assemblies and a wire feeding mechanism; the plurality of wire rack assemblies are distributed radially around the center of the workbench, and each wire rack assembly comprises a bottom plate, a radial driving mechanism arranged on the bottom plate and a wire rack fixed on a sliding block of the radial driving mechanism; the wire rack is in the shape of "[", and the opening of the "[ " shape is directed towards the center column; the wire feeding mechanism comprises a first guide wheel assembly arranged on the workbench, a second guide wheel assembly arranged on the radial driving mechanism and the wire rack, a third guide wheel assembly arranged on the center column and a fourth guide wheel assembly arranged between two wire rack assemblies. The wire-cut electrical discharge machine can not only realize the machining of two-dimensional holes in disc-shaped parts, but also realize the synchronous machining of multiple holes, thereby greatly improving the machining efficiency.

Description

Technical Field

[0001] This invention relates to the field of wire electrical discharge machining technology, specifically to a wire electrical discharge machining machine tool for machining disc-shaped multi-hole parts. Background Technology

[0002] Electrical discharge wire cutting (EDF) works by creating a discharge channel in the working fluid through an electric field between two electrodes, generating instantaneous high temperatures that melt, vaporize, and erode the material to achieve cutting. EDF is a non-contact machining process, without macroscopic forces, and is unaffected by material hardness and strength, making it widely used in mold making, engineering machinery, aerospace, and other fields.

[0003] When machining multiple irregular through holes distributed on a disc-shaped porous part, the existing method is to use a traditional wire electrical discharge machining (EDM) machine to cut each hole one by one, which is very inefficient.

[0004] In existing technologies, multiple wire EDM stations are set up to improve cutting efficiency. For example, patent application CN104002001A discloses a single-wire multi-station wire EDM machine tool, which cuts a ring-shaped part into multiple pieces by driving multiple independent wire frames for radial feed. However, all the wire frames of the above machine tool are arranged radially inside the ring-shaped workpiece, and the wire frames cut radially from the inside to the outside, resulting in the machine tool only being able to perform one-dimensional linear cutting and being unable to process two-dimensional irregular holes on disc-shaped parts. To address this, an EDM wire EDM machine tool for processing disc-shaped multi-hole parts is proposed to achieve simultaneous hole processing of disc-shaped multi-hole parts. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned problems and provide an electrical discharge wire cutting machine tool for processing disc-shaped multi-hole parts. This electrical discharge wire cutting machine tool can not only realize the processing of two-dimensional holes in disc-shaped parts, but also realize the simultaneous processing of multiple holes, which greatly improves the processing efficiency.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] An electrical discharge wire cutting machine tool for processing disc-shaped porous parts includes a worktable, a central column disposed in the middle of the worktable, a rotary device for driving the disc-shaped porous parts to rotate, multiple wire frame assemblies disposed on the worktable for processing, and a wire feeding mechanism for guiding the electrode wire; the multiple wire frame assemblies are radially distributed around the center of the worktable, wherein...

[0008] The wire frame assembly includes a base plate, a radial drive mechanism disposed on the base plate, and a wire frame fixed on a slider of the radial drive mechanism; wherein, the wire frame is a "[" shaped frame, and the opening of the "[" shaped frame faces the central column;

[0009] The wire feeding mechanism includes a first guide wheel assembly mounted on the worktable for guiding the electrode wire in and out of the winding drum, a second guide wheel assembly mounted on the radial drive mechanism and the wire frame, a third guide wheel assembly mounted on the central column, and a fourth guide wheel assembly mounted between the two wire frame assemblies. After the electrode wire exits the winding drum and passes through the first guide wheel assembly, it passes through a second guide wheel assembly. Under the guidance of the third and fourth guide wheel assemblies, the electrode wire passes through the remaining second guide wheel assemblies in sequence, and finally returns to the winding drum through the first guide wheel assembly.

[0010] The working principle of the wire EDM machine tool used for processing disc-shaped multi-hole parts is as follows:

[0011] When machining disc-shaped multi-hole parts, the center hole of the part is fitted into a central column and placed on a rotary device. The part is centered and positioned by a tapered guide centering block. Then, the electrode wire is fed. The electrode wire coming out of the winding drum is guided through the first guide wheel assembly, then into a second guide wheel assembly. Under the guidance of the third and fourth guide wheel assemblies, the electrode wire finally passes through the second guide wheel assemblies on each wire frame, and finally returns to the winding drum through the first guide wheel assembly. After the wire feeding process is completed, the part is machined. The rotary device drives the part to rotate, and the radial drive mechanism drives the wire frame to feed radially. The radial feed of the electrode wire and the rotation of the part driven by the wire frame complete the machining of the two-dimensional hole. Multiple wire frame assemblies feed simultaneously and rotate in coordination with the part, which can realize the synchronous machining of multiple holes.

[0012] In a preferred embodiment of the present invention, the central part of the rotary device is a hollow structure, and the central column protrudes from the hollow structure of the rotary device. This is intended to make the rotary device structure more compact and also facilitate the driving of the disc-shaped porous component to rotate.

[0013] Preferably, the rotary device is equipped with a tapered guide centering block for positioning the disc-shaped porous part. By setting the tapered guide centering block, the disc-shaped porous part is made coaxial with the rotary device and is not eccentric, thus ensuring machining accuracy.

[0014] Preferably, the wire frame includes a vertical arm, an upper arm connected to the upper end of the vertical arm, and a lower arm connected to the lower end of the vertical arm; wherein, the second guide wheel assembly includes a guide wheel disposed above the radial drive mechanism, an upper guide wheel disposed at the end of the upper arm, and a lower guide wheel disposed at the end of the lower arm; each wire frame assembly is provided with one of the above-mentioned second guide wheel assemblies. In the above structure, the electrode wire can pass through the guide wheel, the lower guide wheel, and the upper guide wheel in sequence; or pass through the upper guide wheel, the lower guide wheel, and the guide wheel in sequence; the specific wire feeding direction is determined according to the actual processing method; the electrode wire between the upper guide wheel and the lower guide wheel is used to realize the cutting processing of the part.

[0015] Preferably, each of the wire frame assemblies can rotate around the center of the worktable to adjust the included angle between two adjacent wire frame assemblies. In the above structure, the wire frame assembly can rotate around the worktable, allowing for adjustment of the wire frame assembly at different positions on the worktable, thereby enabling flexible processing of disc-shaped multi-hole parts.

[0016] Preferably, there are six wire guide assemblies, each corresponding to one of the six workstations: A, B, C, D, E, and F. By adjusting the position of the wire guides, it is possible to process two, three, four, or five holes.

[0017] Preferably, the third guide wheel assembly includes a first set of steering guide wheels, a second set of steering guide wheels, and a third set of steering guide wheels; the first guide wheel assembly includes an infeed guide wheel and an outfeed guide wheel; and the fourth guide wheel assembly includes a first tension guide wheel and a second tension guide wheel.

[0018] Preferably, when performing uniformly distributed six-hole machining, the included angle between two adjacent workstations is 60°, and the specific wire path of the electrode wire is as follows:

[0019] The electrode wire emerges from the winding drum, passes the feed guide roller, reaches the guide roller in station A, then turns to the lower guide roller in station A, and then travels upward through the upper guide roller in station A, entering the first set of steering guide rollers on the central column. Guided by the first set of steering guide rollers, the electrode wire enters the upper guide roller in station B, travels downward through the lower guide roller in station B, and then passes the guide roller in station B; next, guided by the first tension guide roller, it enters the guide roller in station C, reaches the lower guide roller in station C, travels upward through the upper guide roller in station C, and then enters the second set of steering guide rollers on the central column. Guided by the second set of steering guide wheels, the electrode wire enters the upper guide wheel in station D, travels downwards through the lower guide wheel in station D, then through the guide wheel in station D, and is then guided by the second tension guide wheel into the guide wheel in station E. After reaching the lower guide wheel in station E, it travels upwards through the upper guide wheel in station E, then enters the third set of steering guide wheels on the central column. Guided by the third set of steering guide wheels, the electrode wire enters the upper guide wheel in station F, travels downwards through the lower guide wheel in station F, then through the guide wheel in station F, and finally returns to the winding drum via the wire exit guide wheel. In this structure, the third and fourth guide wheel assemblies allow the electrode wire to change direction, guiding it into the wire frame assemblies in different stations; the fourth guide wheel assembly also tensions the electrode wire, improving machining accuracy.

[0020] Preferably, when performing uniform five-hole machining, the wire frame assembly in station F is in a non-working state, while the wire frame assemblies in the other stations are in a working state. The included angle between two adjacent stations in the working state is 72°. The second guide wheel assembly (12) on the wire frame assembly in station F further includes an upper auxiliary guide wheel (51) disposed at the upper end of the vertical arm and a lower auxiliary guide wheel (52) disposed at the lower end of the vertical arm. The specific wire feeding path of the electrode wire is as follows:

[0021] The electrode wire emerges from the winding drum, passes through the feed guide roller (41) to the guide roller in station A, then turns to the lower guide roller in station A, and then moves upward through the upper guide roller in station A, entering the first set of steering guide rollers (141) on the central column. Guided by the first set of steering guide rollers (141), the electrode wire enters the upper guide roller in station B, moves downward through the lower guide roller in station B, and then passes through the guide roller in station B; next, guided by the first tension guide roller (151), it enters the guide roller in station C, reaches the lower guide roller in station C, moves upward through the upper guide roller in station C, and then enters the second set of steering guide rollers (142) on the central column. Guided by the first set of guide rollers (142), the electrode wire enters the upper guide roller in station D, moves downward through the lower guide roller in station D, then through the guide roller in station D, and then through the second tension guide roller (152) to the guide roller in station E, and then to the lower guide roller in station E. Moving upward through the upper guide roller in station E, it enters the third set of guide rollers (143) on the central column. Guided by the third set of guide rollers (143), the electrode wire enters the upper guide roller in station F, then through the upper auxiliary guide roller (51), moves downward through the lower auxiliary guide roller (52), then through the guide roller in station F, and finally through the wire exit guide roller (48) back to the winding drum. In the above structure, the wire feeding path of the uniformly distributed five-hole machining is similar to that of the uniformly distributed six-hole machining. The difference is that the uniformly distributed five-hole machining does not require the wire to be fed to the lower guide wheel in station F. Instead, it needs to be fed in the wire feeding adjustment direction of the upper and lower auxiliary guide wheels, and then fed to the first guide wheel assembly between station A and station F. The electrode wire is adjusted to be parallel to the wire feeding direction by the first guide wheel assembly and returns to the winding drum.

[0022] Preferably, the first guide wheel assembly is disposed between station A and station B; the first, second, and third sets of steering guide wheels each have two guide wheels; the first, second, and third sets of steering guide wheels are respectively located at the middle of the extended lines of station A and station B, the middle of the extended lines of station C and station D, and the middle of the extended lines of station E and station F; the fourth guide wheel assembly is disposed on the worktable, the first tensioning guide wheel is disposed between station B and station C, and the second tensioning guide wheel is disposed between station D and station E. This structure facilitates the feeding of the electrode wire and minimizes the wire feeding distance.

[0023] Preferably, the worktable has a circular guide boss at its center, and the inner end of the base plate has an arc-shaped groove that engages with the outer side of the circular guide boss. The outer end of the base plate has an arc-shaped groove with a fixing bolt for fixing the base plate to the worktable. The fixing bolt passes through the arc-shaped groove and connects to the worktable. By setting the circular guide boss and the arc-shaped groove, the base plate can rotate along the circular guide boss, thereby enabling the wire frame assembly to rotate around the center of the worktable and achieving precise positioning of the base plate. The arc-shaped groove and the fixing bolt facilitate angle adjustment between the wire frame assemblies, and the fixing bolt facilitates fixing and positioning the base plate while also facilitating disassembly. The circular guide boss and the fixing bolt enable radial positioning of the base plate. After loosening the fixing bolt, the base plate can be moved along the circumference to a designated position, and then the fixing bolt can be tightened to fix the base plate.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. The wire EDM machine tool for processing disc-shaped multi-hole parts in this invention drives the conical guide centering block to rotate through a rotary device, thereby causing the disc-shaped part to rotate. In conjunction with the radial drive mechanism, the wire frame is driven to feed in the radial direction, which drives the electrode wire of the second guide wheel assembly to feed continuously, thereby completing the processing of two-dimensional holes. Multiple wire frame assemblies work simultaneously, which can realize the synchronous processing of multiple holes. The multi-station synchronous processing method has the advantages of high processing efficiency, small workpiece deformation, and small machine tool footprint.

[0026] 2. The wire EDM machine tool for processing disc-shaped multi-hole parts in this invention has a wire frame in the shape of a "[" with the opening facing the central column, so that the wire frame assembly is arranged on the outside of the disc-shaped part. When the rotating device drives the disc-shaped part to rotate, there will be no spatial interference with the wire frame, which facilitates processing.

[0027] 3. In the preferred embodiment of the present invention, by setting a conical guide centering block, the disc-shaped porous part is made coaxial with the rotary device without eccentricity, thus ensuring machining accuracy. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the six-hole disc-shaped part in this invention.

[0029] Figure 2 This is a three-dimensional structural diagram of an electrical discharge wire cutting machine tool for processing disc-shaped porous parts, equipped with a wire winding drum and a control device, according to the present invention.

[0030] Figures 3-4 This is a schematic diagram of the structure of a first specific embodiment of the wire electrical discharge machining (EDM) machine tool of the present invention, wherein, Figure 3 It is a 3D image. Figure 4 This is a top view.

[0031] Figure 5 This is a schematic diagram of the processing station distribution of the wire electrical discharge machining tool in this invention.

[0032] Figure 6 This is a partial structural schematic diagram of the wire electrical discharge machining tool of the present invention.

[0033] Figure 7 This is a schematic diagram of the wire path of the electrode wire in the wire EDM machine for machining a six-hole disc-shaped part according to the present invention.

[0034] Figures 8-10 This is a schematic diagram of the wire frame assembly in the present invention, wherein, Figure 8 It is a 3D image. Figure 9 A stereoscopic view from another perspective. Figure 10 This is a stereoscopic view from a third perspective.

[0035] Figure 11 This is a three-dimensional structural diagram of the wire frame in this invention.

[0036] Figure 12 This is a three-dimensional structural diagram of the workbench in this invention.

[0037] Figure 13 This is a schematic diagram of the wire feed path structure of the wire EDM machine tool in this invention when machining a six-hole disc-shaped part.

[0038] Figure 14 This is a schematic diagram of the five-hole disc-shaped part in this invention.

[0039] Figure 15 This is a schematic diagram of the structure of a second specific embodiment of the wire electrical discharge machining tool of the present invention.

[0040] Figure 16 This is a three-dimensional structural diagram of the wire frame assembly in station F of the present invention.

[0041] Figure 17This is a schematic diagram of the wire path of the electrode wire in the wire EDM machine for machining a five-hole disc-shaped part according to the present invention.

[0042] Figure 18 This is a schematic diagram of the processing station distribution of the wire electrical discharge machining tool in this invention. Detailed Implementation

[0043] To enable those skilled in the art to fully understand the technical solutions of the present invention, the present invention will be further described below in conjunction with embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0044] Example 1

[0045] See Figures 1-4 This embodiment takes the machining of a disc-shaped part with six evenly distributed holes as an example. Figure 1 The diagram shows a six-hole disc-shaped part in this embodiment. This embodiment discloses an electrical discharge wire cutting machine for processing disc-shaped multi-hole parts, including a worktable 31, a central column 34 disposed in the middle of the worktable 31, a rotary device 32 for driving the disc-shaped multi-hole part to rotate, six wire frame assemblies 35 for processing disposed on the worktable 31, and a wire feeding mechanism 1 for guiding the electrode wire; the six wire frame assemblies 35 are radially distributed around the center of the worktable 31.

[0046] See Figure 3 The rotary device 32 is equipped with a tapered guide centering block 33 for positioning the disc-shaped porous part. The diameter of the upper end of the tapered guide centering block 33 gradually decreases upward. By setting the tapered guide centering block 33, the disc-shaped porous part is made coaxial with the rotary device 32 without eccentricity, ensuring machining accuracy. In addition, it can also adapt to the fixing and positioning of disc-shaped parts with different center hole diameters, making it highly versatile.

[0047] See Figure 3 and Figure 13 The rotary device 32 is located at the center of the worktable 31, supporting the disc-shaped part and driving its rotation. To facilitate positioning of the disc-shaped part and ensure concentricity between the part and the rotary device 32, a conical guide centering block 33 is positioned at the upper end of the rotary device 32. The conical guide centering block 33 is coaxially arranged with the rotary device 32. The central part of the rotary device 32 is hollow, and the central column 34 protrudes through this hollow structure. The disc-shaped part with a central hole is fitted onto the central column 34, with its bottom surface resting on the rotary device 32. Centering of the disc-shaped part is achieved through the hollow conical guide centering block 33. The rotary device 32 can be a combination of gear rotation and a motor.

[0048] See Figure 1 , Figure 6and Figures 8-10 Each of the wire frame assemblies 35 includes a base plate 351 mounted on a worktable 31, a radial drive mechanism mounted on the base plate 351, and a wire frame 352 fixed to a slider 22 of the radial drive mechanism. The slider 22 moves on the base plate 351, causing the wire frame 352 to move radially. The wire frame 352 is a "[" shaped frame, with its opening facing the central column 34. In the above structure, each wire frame 352 is driven by an individual radial drive mechanism. The radial drive mechanism is uniformly controlled by the control device 70 to achieve synchronous feeding of the wire frame 352, and to achieve linkage control with the rotary device 32.

[0049] See Figures 2-4 The wire feeding mechanism 1 includes a first guide wheel assembly 11 mounted on the worktable 31 for guiding the electrode wire into and out of the winding drum 80, a second guide wheel assembly 12 mounted on the radial drive mechanism and wire frame 352, a third guide wheel assembly 14 mounted on the central column 34, and a fourth guide wheel assembly 15 mounted between the two wire frame assemblies 35. The number of wire frame assemblies 35 is six, and each radial drive mechanism and wire frame 352 has a second guide wheel assembly 12. Therefore, there are also six corresponding second guide wheel assemblies 12, namely second guide wheel assembly 121, second guide wheel assembly 122, second guide wheel assembly 123, second guide wheel assembly 124, second guide wheel assembly 125, and second guide wheel assembly 126. The electrode wire emerges from the winding drum 80, passes through the first guide wheel assembly 11, then the second guide wheel assembly 121, and under the guidance of the third guide wheel assembly 14 and the fourth guide wheel assembly 15, sequentially passes through the remaining second guide wheel assemblies 122, 123, 124, 125, and 126, finally returning to the winding drum 80 via the first guide wheel assembly 11. The guidance of the third guide wheel assembly 14 and the fourth guide wheel assembly 15 ensures that the electrode wire passes through the second guide wheel assembly 12 on each wire frame assembly 35, thereby enabling simultaneous machining of the six holes on the disc-shaped part.

[0050] See Figure 6 and Figures 8-10The radial drive mechanism includes a drive motor 353 mounted on the base plate 351, a lead screw 354 connected to the drive component of the drive motor 353, a lead screw nut 355 located at the lower end of the lead frame 352 and cooperating with the lead screw 354, and a guide assembly for guiding the movement of the lead frame 352 on the base plate 351. The guide assembly includes a guide rail 21 mounted on the base plate 351 and a slider 22 located at the lower end of the lead frame 352, with the guide rail 21 and the slider 22 slidably connected. In this structure, the drive motor 353 drives the lead screw 354 to rotate, causing the lead screw nut 355 to move along the axis of the lead screw 354, thereby driving the lead frame 352 to move along the axis of the lead screw 354, achieving the feeding of the lead frame 352. The guide assembly ensures more stable movement of the lead frame 352 during feeding.

[0051] See Figures 6-7 and Figures 10-11 The wire frame 352 includes a vertical arm 3521, an upper arm 3522 connected to the upper end of the vertical arm 3521, and a lower arm 3523 connected to the lower end of the vertical arm 3521. The second guide wheel assembly 12 includes a guide wheel 42 mounted on the housing of the drive motor 353, an upper guide wheel 44 mounted at the end of the upper arm 3522, and a lower guide wheel 43 mounted at the end of the lower arm 3523. In this structure, the electrode wire can pass sequentially through the guide wheel 42, the lower guide wheel 43, and the upper guide wheel 44; or sequentially through the upper guide wheel 44, the lower guide wheel 43, and the guide wheel 42. The specific wire feeding direction is determined according to the actual processing method. The electrode wire between the upper guide wheel 44 and the lower guide wheel 43 is used for cutting the parts.

[0052] See Figures 3-4 Each of the wire frame assemblies 35 is movably connected to the worktable 31, and each wire frame assembly 35 can rotate around the center of the worktable 31 to adjust the included angle between two adjacent wire frame assemblies 35. In the above structure, the wire frame assembly 35 can rotate around the worktable 31, which allows for adjustment of the wire frame assembly 35 at different positions on the worktable 31, thereby enabling flexible processing of disc-shaped multi-hole parts.

[0053] See Figures 3-4 , Figures 6-9 and Figure 12The wire frame assembly 35 can rotate around the center of the worktable 31 by a certain angle to process disc-shaped parts with different numbers and distributions of holes. Each wire frame assembly 35 is provided with a position fixing mechanism 6 between itself and the worktable 31 to fix the wire frame assembly 35 at different positions on the worktable. The position fixing mechanism 6 includes multiple sets of first positioning holes 61 on the worktable 31 and second positioning holes 62 on the base plate 351. The positions of the second positioning holes 62 correspond to those of each set of first positioning holes 61. By setting the above structure and the position fixing mechanism 6, the position of the wire frame assembly 35 in the circumferential direction can be adjusted, allowing adjacent wire frame assemblies 35 to be at different angles. Each set of first positioning holes 61 represents a position change. By matching the second positioning holes 62 with the first positioning holes 61, the position change of the wire frame assembly 35 is achieved. After the position is adjusted, the second positioning holes 62 and the first positioning holes 61 can be fixed with bolts to achieve the positioning purpose.

[0054] See Figures 8-10 The lead screw 354 is fixed on the base plate 351 by two mounting seats 356. The drive motor 353 is mounted on the mounting seat 356. The mounting seat 356 is also provided with a second positioning hole 62, which corresponds one-to-one with the second positioning hole 62 on the base plate 351.

[0055] See Figures 3-7 The six wire guide assemblies 35 correspond to six workstations, namely workstation A, workstation B, workstation C, workstation D, workstation E, and workstation F. By setting up six wire guide assemblies 35, the simultaneous processing of six holes can be achieved. At the same time, the wire feeding mechanism 1 can be flexibly fed. For the wire guide assembly 35 that needs to be worked, the electrode wire is arranged on the second guide wheel assembly 12. With the help of the position fixing mechanism 6, the position of the wire guide assembly 35 can be adjusted to flexibly realize the processing of two holes, three holes, four holes, or five holes.

[0056] See Figures 3-7 and Figure 12The first guide wheel assembly 11 is disposed between station A and station B, and includes a wire feeding guide wheel 41 and a wire exiting guide wheel 48. The third guide wheel assembly 14 includes a first set of steering guide wheels 141, a second set of steering guide wheels 142, and a third set of steering guide wheels 143. The first, second, and third sets of steering guide wheels (141, 142, 143) each have two guide wheels. The first, second, and third sets of steering guide wheels (141, 142, 143) are located at the middle of the extended lines of station A and station B, the middle of the extended lines of station C and station D, and the middle of the extended lines of station E and station F, respectively. The fourth guide wheel assembly 15 includes a first tensioning guide wheel 151 and a second tensioning guide wheel 152 disposed on the worktable 31. The first tensioning guide wheel 151 is disposed between station B and station C, and the second tensioning guide wheel 152 is disposed between station D and station E. The above structure facilitates the feeding of the electrode wire and minimizes the feeding distance. The electrode wire first enters station A from the feed guide roller 41, and finally returns from station F to the output guide roller 48, adjusting the direction of the electrode wire to be parallel to the feed direction, and then returns to the winding drum 80.

[0057] See Figures 3-7 and Figure 13 The wire EDM machine tool in this embodiment can simultaneously process six evenly distributed holes. When processing six evenly distributed holes, the included angle between two adjacent stations is 60°; the specific wire path of the electrode wire is as follows:

[0058] The electrode wire emerges from the winding drum 80, passes through the feed guide roller (41) to reach the guide roller 42 in station A, then turns to reach the lower guide roller 43 in station A, and then moves upward through the upper guide roller 44 in station A, entering the first set of steering guide rollers (141) on the central column 34. Guided by the first set of steering guide rollers (141), the electrode wire enters the upper guide roller 44 in station B, moves downward through the lower guide roller 43 in station B, and then passes through the guide roller 42 in station B; then, guided by the first tension guide roller (151), it enters the guide roller 42 in station C, reaches the lower guide roller 43 in station C, moves upward through the upper guide roller 44 in station C, and then enters the second set of steering guide rollers (151) on the central column 34. 42) Guided by the second set of steering guide wheels (142), the electrode wire enters the upper guide wheel 44 in station D, moves downward through the lower guide wheel 43 in station D, then through the guide wheel 42 in station D, and then through the second tension guide wheel (152) into the guide wheel 42 in station E, and then reaches the lower guide wheel 43 in station E. After moving upward through the upper guide wheel 44 in station E, it enters the third set of steering guide wheels (143) on the central column 34. Guided by the third set of steering guide wheels (143), the electrode wire enters the upper guide wheel 44 in station F, moves downward through the lower guide wheel 43 in station F, then through the guide wheel 42 in station F, and finally through the wire exit guide wheel (48) back to the winding drum 80. In the above structure, the third guide wheel assembly 14 and the fourth guide wheel assembly 15 can change the direction of the electrode wire and guide the electrode wire into the wire frame assembly 35 in different work positions; the fourth guide wheel assembly 15 can also tension the electrode wire and improve the processing accuracy.

[0059] See Figure 7 When the electrode wire moves from the upper guide wheel 44 on the previous wire frame 352 to the upper guide wheel 44 on the next wire frame 352 via the steering guide wheel 45, it is essential to ensure that the electrode wire does not deviate from the guide wheel groove, thus preventing wear. Therefore, the guide wheel groove of the steering guide wheel 45 must be tangent to the plane containing the guide wheel grooves of its front and rear upper guide wheels 44, respectively, and the guide wheel grooves of the front and rear upper guide wheels 44 must also be tangent to the plane containing the guide wheel groove of the steering guide wheel 45.

[0060] Wire EDM machines operate in polar coordinates, with the wire frame moving linearly at 35° and the workpiece rotating.

[0061] See Figures 1-10 and Figure 13 The working principle of the wire EDM machine tool used for processing disc-shaped porous parts is as follows:

[0062] Before machining the disc-shaped porous part, a coarse hole is first opened on the disc-shaped porous part for the electrode wire to pass through. When machining the disc-shaped porous part is required, the center hole of the part is fitted into the center column 34 and placed on the rotary device. The part is centered and positioned by the conical guide centering block 33. Then the electrode wire is loaded. Each wire frame assembly 35 is equipped with a corresponding second guide wheel assembly 12. The electrode wire coming out of the wire winding drum 80 is guided through the first guide wheel assembly 11 and then enters the first second guide wheel assembly 121 (the second guide wheel assembly in station A). Under the rotation of the third guide wheel assembly 14, it passes through the second second guide wheel. Component 122 (the second guide wheel assembly in station B), then guided by the fourth guide wheel assembly 15, enters the third second guide wheel assembly 123 (the second guide wheel assembly in station C), then through the direction of the third guide wheel assembly 14, passes through the fourth second guide wheel assembly 124 (the second guide wheel assembly in station D), then through the fourth guide wheel assembly 15, enters the fifth second guide wheel assembly 125 (the second guide wheel assembly in station E), then through the direction of the third guide wheel assembly 14, passes through the sixth second guide wheel assembly 126 (the second guide wheel assembly in station F), and finally returns to the winding drum 80 through the first guide wheel assembly 11. When the electrode wire passes through the second guide wheel assembly 12, it passes through the coarse hole on the disc-shaped porous part. After the wire is fed, the part is processed. The part can be driven to rotate by the rotary device 32, and the wire frame 352 is driven to feed radially by the radial drive mechanism, which drives the electrode wire of the second guide wheel assembly 12 to continuously feed, thereby completing the processing of the two-dimensional hole. The six wire frame assemblies 35 work simultaneously, which can realize the synchronous processing of six holes. Among them, the first second guide wheel assembly 121 is located at station A, the second second guide wheel assembly 122 is located at station B, the third second guide wheel assembly 123 is located at station C, the fourth second guide wheel assembly 124 is located at station D, the fifth second guide wheel assembly 125 is located at station E, and the sixth second guide wheel assembly 126 is located at station F.

[0063] Example 2

[0064] See Figure 14 This embodiment takes the machining of a disc-shaped part with five evenly distributed holes as an example. Figure 14 The diagram below shows a schematic of the five-hole disc-shaped part in this embodiment.

[0065] See Figures 15-18The other structures in this embodiment are the same as in Embodiment 1, except that the wire EDM machine in this embodiment processes a five-hole disc-shaped part with the five holes evenly distributed. When processing the five evenly distributed holes, there are still six wire frame assemblies 35. The wire frame assembly 35 at station F is in a non-working state, while the wire frame assemblies 35 at the other five stations are in a working state. The positions of the five wire frame assemblies 35 in the working state are adjusted by the position fixing mechanism 6, so that the included angle between two adjacent wire frame assemblies 35 is 72°, i.e., the included angle between two adjacent stations in the working state is 72°. The second guide wheel assembly 126 on the wire frame assembly 35 at station F also includes an upper auxiliary guide wheel 51 disposed at the upper end of the vertical arm 3521 and a lower auxiliary guide wheel 52 disposed at the lower end of the vertical arm 3521. The specific wire path of the electrode wire is as follows:

[0066] The electrode wire emerges from the winding drum 80, passes through the feed guide roller (41) to the guide roller 42 in station A, then turns to the lower guide roller 43 in station A, and then moves upward through the upper guide roller 44 in station A before entering the first set of steering guide rollers (141) on the central column 34. Guided by the first set of steering guide rollers (141), the electrode wire enters the upper guide roller 44 in station B, moves downward through the lower guide roller 43 in station B, and then passes through the guide roller 42 in station B. Next, guided by the first tension guide roller (151), it enters the guide roller 42 in station C, reaches the lower guide roller 43 in station C, moves upward through the upper guide roller 44 in station C, and then enters the second set of steering guide rollers (142) on the central column 34. Guided by the second set of steering guide wheels (142), the electrode wire enters the upper guide wheel 44 in station D, passes down through the lower guide wheel 43 in station D, then passes through the guide wheel 42 in station D, and then, guided by the second tension guide wheel (152), enters the guide wheel 42 in station E, reaches the lower guide wheel 43 in station E, passes up through the upper guide wheel 44 in station E, and enters the third set of steering guide wheels (143) on the central column 34. Guided by the third set of steering guide wheels (143), the electrode wire enters the upper guide wheel 44 in station F, then passes through the upper auxiliary guide wheel 51, passes down through the lower auxiliary guide wheel 52, then passes through the guide wheel 42 in station F, and finally returns to the winding drum 80 through the wire exit guide wheel (48). In the above structure, the wire feeding path of the five-station synchronous processing mode is similar to that of the six-station synchronous processing mode. The difference between the five-station synchronous processing mode and the six-station synchronous processing mode is that in the five-station synchronous processing mode, the wire does not need to feed to the lower guide roller 43 in station F. Instead, it needs to feed in the wire feeding adjustment direction of the upper auxiliary guide roller 51 and the lower auxiliary guide roller 52, and then feed to the first guide roller assembly 11 between station A and station F. The electrode wire is adjusted to be parallel to the wire feeding direction by the first guide roller assembly 11 and returns to the winding drum 80.

[0067] Example 3

[0068] See Figure 3 , Figure 4 , Figure 8 and Figures 19-20 The other structures in this embodiment are the same as in Embodiment 1. The difference is that the position fixing mechanism 6 in Embodiment 1 is not used for position fixing in this embodiment. Instead, the following is used: a circular guide boss 9 is provided on the center of the workbench 31, an arc groove 91 is provided on the inner end of the base plate 351, the arc groove 91 is connected to the outer side of the circular guide boss 9, and an arc groove 92 is provided on the outer end of the base plate 351. A fixing bolt 93 for fixing the base plate 351 on the workbench 31 is provided on the arc groove 92, and the fixing bolt 93 passes through the arc groove 92 and is connected to the workbench. By setting a circular guide boss 9 and an arc groove 91, the base plate 351 can rotate along the circular guide boss 9, thereby realizing the rotation of the wire frame assembly 35 around the center of the worktable 31, and at the same time, the base plate 351 can be precisely positioned. By setting an arc groove 92 and a fixing bolt 93, the angle between the wire frame assemblies 35 can be easily adjusted. The fixing bolt 93 can be used to fix and position the base plate 351, and it is also easy to disassemble. The circular guide boss 9 and the fixing bolt 93 can achieve radial positioning of the base plate 351. After loosening the fixing bolt 93, the base plate 351 can be moved along the circumferential direction. After moving to the designated position, the fixing bolt 93 can be tightened to fix the base plate 351.

[0069] See Figure 21 The upper arm 3522 is adjustable up and down on the vertical arm 3521. The upper arm 3522 is provided with a wedge block 100, and the vertical arm 3521 is provided with a vertically extending wedge groove 101. The wedge block 100 and the wedge groove 101 slide against each other. This structure allows the upper arm 3522 to move up and down on the vertical arm 3521, and the height of the upper arm 3522 can be adjusted according to the thickness of the part.

[0070] The upper arm 3522 is provided with an adjusting bolt for fixing the upper arm 3522. When fixed, the adjusting bolt abuts against the groove surface of the wedge groove 101. By setting the adjusting bolt, when the adjusting bolt is loosened, the wedge block 100 slides freely with the wedge groove 101, and the upper arm 3522 can move up and down on the vertical arm 3521. When the height of the upper arm 3522 is adjusted, the adjusting bolt is tightened, and the upper arm 3522 can be fixed on the vertical arm 3521.

[0071] The above are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above content. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A wire electrical discharge machining (EDM) machine for processing disc-shaped porous parts, characterized in that, The system includes a worktable, a central column located in the middle of the worktable, a rotary device for driving the rotation of the disc-shaped porous part, multiple wire frame assemblies for machining mounted on the worktable, and a wire feeding mechanism for guiding the electrode wire. The multiple wire frame assemblies are radially distributed around the center of the worktable. The wire frame assembly includes a base plate, a radial drive mechanism disposed on the base plate, and a wire frame fixed on a slider of the radial drive mechanism; wherein, the wire frame is a "[" shaped frame, and the opening of the "[" shaped frame faces the central column; The wire feeding mechanism includes a first guide wheel assembly (11) set on the worktable for guiding the electrode wire in and out of the winding drum, a second guide wheel assembly (121, 122, 123, ...) set on the radial drive mechanism and the wire frame, a third guide wheel assembly (14) set on the central column, and a fourth guide wheel assembly (15) set between the two wire frame assemblies. After the electrode wire comes out of the winding drum and passes through the first guide wheel assembly (11), it passes through the second guide wheel assembly (121). Under the guidance of the third guide wheel assembly (14) and the fourth guide wheel assembly (15), the electrode wire passes through the remaining second guide wheel assemblies (122, 123, ...) in sequence, and finally returns to the winding drum through the first guide wheel assembly (11). The central part of the rotary device is a hollow structure, and the central column protrudes from the hollow structure of the rotary device. Each of the aforementioned wire frame assemblies can rotate about the center of the worktable to adjust the included angle between two adjacent wire frame assemblies; Each of the wire frame assemblies is provided with a positioning mechanism between itself and the worktable for fixing the wire frame assembly at different positions on the worktable; the positioning mechanism includes multiple sets of first positioning holes provided on the worktable and second positioning holes provided on the base plate; the positions of the second positioning holes correspond to the positions of each set of first positioning holes.

2. The wire electrical discharge machining (EDM) machine tool for processing disc-shaped multi-hole parts according to claim 1, characterized in that, The rotary device is equipped with a tapered guide centering block for positioning disc-shaped porous parts.

3. The wire electrical discharge machining (EDM) machine tool for processing disc-shaped multi-hole parts according to claim 1, characterized in that, The wire frame includes a vertical arm, an upper arm connected to the upper end of the vertical arm, and a lower arm connected to the lower end of the vertical arm; wherein, the second guide wheel assembly includes a guide wheel disposed above the radial drive mechanism, an upper guide wheel disposed at the end of the upper arm, and a lower guide wheel disposed at the end of the lower arm.

4. The wire electrical discharge machining (EDM) machine tool for processing disc-shaped porous parts according to claim 3, characterized in that, The number of wire frame assemblies is six, and the six wire frame assemblies correspond to the six workstations A, B, C, D, E and F respectively.

5. The wire electrical discharge machining (EDM) machine tool for processing disc-shaped porous parts according to claim 4, characterized in that, The third guide wheel assembly (14) includes a first set of steering guide wheels (141), a second set of steering guide wheels (142) and a third set of steering guide wheels (143); the first guide wheel assembly (11) includes an infeed guide wheel (41) and an outfeed guide wheel (48); the fourth guide wheel assembly (15) includes a first tension guide wheel (151) and a second tension guide wheel (152).

6. The wire electrical discharge machining (EDM) machine tool for processing disc-shaped multi-hole parts according to claim 5, characterized in that, When machining six holes evenly distributed, the included angle between two adjacent stations is 60°; the specific wire path of the electrode wire is as follows: The electrode wire emerges from the winding drum, passes through the feed guide roller (41) to the guide roller in station A, then turns to the lower guide roller in station A, and then moves upward through the upper guide roller in station A, entering the first set of steering guide rollers (141) on the central column. Guided by the first set of steering guide rollers (141), the electrode wire enters the upper guide roller in station B, moves downward through the lower guide roller in station B, and then passes through the guide roller in station B; next, guided by the first tension guide roller (151), it enters the guide roller in station C, reaches the lower guide roller in station C, moves upward through the upper guide roller in station C, and then enters the second set of steering guide rollers (141) on the central column. 2) Guided by the second set of steering guide wheels (142), the electrode wire enters the upper guide wheel in station D, moves downward through the lower guide wheel in station D, then through the guide wheel in station D, and then through the second tension guide wheel (152) to enter the guide wheel in station E, and then reaches the lower guide wheel in station E. Moving upward through the upper guide wheel in station E, it enters the third set of steering guide wheels (143) on the central column. Guided by the third set of steering guide wheels (143), the electrode wire enters the upper guide wheel in station F, moves downward through the lower guide wheel in station F, then through the guide wheel in station F, and finally through the wire exit guide wheel (48) to return to the winding drum.

7. The wire electrical discharge machining (EDM) machine tool for processing disc-shaped porous parts according to claim 4, characterized in that, When performing uniform five-hole machining, the wire frame assembly in station F is in a non-working state, while the wire frame assemblies in the other stations are in a working state. Among the stations in the working state, the included angle between two adjacent stations is 72°. The second guide wheel assembly (12) on the wire frame assembly in station F also includes an upper auxiliary guide wheel (51) disposed at the upper end of the vertical arm and a lower auxiliary guide wheel (52) disposed at the lower end of the vertical arm. The specific wire feeding path of the electrode wire is as follows: The electrode wire emerges from the winding drum, passes through the feed guide roller (41) to the guide roller in station A, then turns to the lower guide roller in station A, and then moves upward through the upper guide roller in station A, entering the first set of steering guide rollers (141) on the central column. Guided by the first set of steering guide rollers (141), the electrode wire enters the upper guide roller in station B, moves downward through the lower guide roller in station B, and then passes through the guide roller in station B; next, guided by the first tension guide roller (151), it enters the guide roller in station C, reaches the lower guide roller in station C, moves upward through the upper guide roller in station C, and enters the second set of steering guide rollers (142) on the central column, passing through the second set of steering guide rollers (142). Guided by the first set of guide rollers (142), the electrode wire enters the upper guide roller in station D, moves downward through the lower guide roller in station D, then through the guide roller in station D, and then through the second tension guide roller (152) to enter the guide roller in station E, and then reaches the lower guide roller in station E. Moving upward through the upper guide roller in station E, it enters the third set of guide rollers (143) on the central column. Guided by the third set of guide rollers (143), the electrode wire enters the upper guide roller in station F, then through the upper auxiliary guide roller (51), moves downward through the lower auxiliary guide roller (52), then through the guide roller in station F, and finally through the wire exit guide roller (48) back to the winding drum.

8. The wire electrical discharge machining (EDM) machine tool for processing disc-shaped porous parts according to claim 1, characterized in that, The workbench has a circular guide boss at its center, and the inner end of the base plate has an arc groove that engages with the outer side of the circular guide boss. The outer end of the base plate has an arc groove with fixing bolts for fixing the base plate to the workbench.

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