A wire cutting and polishing apparatus for mold machining

Abstract

The application discloses a wire cutting polishing equipment for die machining, relates to the technical field of metal surface treatment, and comprises a rack, a side frame, a first driving element, a rotating disc, first electromagnets, a working bucket, a discharge port, a plugging plug, a translation assembly, an auxiliary assembly and a water spraying pipe. Stable magnetic fields are formed by rotating the first electromagnets on the rotating disc. The translation assembly drives the working bucket to move horizontally and reciprocally. The rotating ring of the auxiliary assembly drives the second electromagnets to ascend and descend along the outer wall of the working bucket. The horizontal inertial pulse and the vertical magnetic force pulse are superposed orthogonally, three-dimensional pulse cutting is formed, the wire cutting white layer can be removed and can penetrate into narrow gaps and vertical grooves, and polishing dead angles can be eliminated. When the first electromagnets are completely demagnetized, the second electromagnets radially adsorb the magnetic needles, and the workpiece is discharged through the discharge port after sinking, so that the magnetic needle and the workpiece are automatically and quickly separated. The equipment integrates precision control, white layer removal and automatic separation, and is high in efficiency.

Description

Technical Field

[0001] This application relates to the field of metal surface treatment technology, and in particular to a wire EDM polishing device for mold processing. Background Technology

[0002] The surface quality of the cavity and core of a liquid silicone injection mold directly determines the molding accuracy, appearance quality, and demolding performance of the silicone product. Inserts, as core functional units for achieving localized precision molding, venting, and cooling, are generally made of hardened steel and are characterized by their small size and complex structure, typically including deep grooves, narrow slits, ribs, and irregularly shaped holes. Wire electrical discharge machining (WEDM) is the mainstream process for machining the complex contours and microstructures of hardened steel inserts. However, the instantaneous high temperature generated by the pulsed discharge during machining causes the surface metal of the workpiece to melt and then rapidly cool, forming a remelted white layer with a thickness of several to tens of micrometers. This white layer has an uneven structure, low hardness, and numerous microcracks. If not removed, it will directly reduce the wear resistance and molding accuracy of the insert, shortening the mold's lifespan. Therefore, the white layer removal and polishing processes after wire cutting are indispensable key steps in the mold insert manufacturing process.

[0003] Currently, the industry commonly uses permanent magnet magnetic polishing machines for polishing small mold inserts after wire cutting. These machines generate an alternating rotating magnetic field through a permanent magnet neodymium iron boron array driven by a motor at the bottom of the equipment. This drives the stainless steel magnetic needles inside the polishing barrel to rotate and tumble at high speed. Combined with the lubrication and cleaning effect of the polishing fluid, this process achieves deburring, removal of the white layer, and finishing of the workpiece surface.

[0004] However, most existing magnetic polishing machines use permanent magnets or fixed magnetic fields, relying solely on the rotating magnetic field at the bottom to drive the magnetic needle in planar circular motion, resulting in significant flow field boundary effects. For complex structures such as deep grooves, narrow slits, and blind holes in inserts, the magnetic needle tends to accumulate and get stuck at the opening of the gap, failing to effectively penetrate to the bottom of the structure. This leads to uneven removal of the remelted white layer and a high rate of white layer residue at the bottom of the gap. Summary of the Invention

[0005] To address the issue of high white residue rate in planar flow field polishing, this application provides a wire EDM polishing device for mold processing.

[0006] The wire EDM polishing equipment for mold processing provided in this application adopts the following technical solution: A wire cutting and polishing device for mold processing includes a frame and a side frame fixedly connected to the frame. A first driving component is provided inside the frame. A turntable is provided at the driving end of the first driving component. A first electromagnet is provided on the turntable. A working barrel is provided on the table surface of the frame at a position corresponding to the turntable. A discharge port is provided at the bottom of the working barrel. A sealing plug is detachably provided in the discharge port. An auxiliary component for separating the magnetic needle from the workpiece is provided on the outer side of the working barrel. The auxiliary component includes a rotating ring that moves up and down in the vertical direction of the working barrel. The rotating ring is arranged around the outer wall of the working barrel, and at least five second electromagnets are arranged on the inner wall of the rotating ring. A translation component is provided on the side frame for cooperating with the second electromagnets and the first electromagnet to form a three-dimensional pulse cutting effect. The output end of the translation component is connected to the bottom of the working barrel and drives the working barrel to move horizontally reciprocatingly. A water spray pipe for rinsing the inside of the working barrel is provided on the frame.

[0007] By adopting the above technical solution, the frame is used to form the main support of the equipment and install the side frame. The side frame is used to be fixedly connected to the frame and carry the translation component. The first driving component is used to be set inside the frame and provide rotation power for the turntable. The turntable is used to drive the first electromagnet to rotate under the drive of the first driving component. The first electromagnet is used to generate a rotating magnetic field on the turntable. The working barrel is set on the frame table corresponding to the turntable and contains the workpiece, magnetic needle and liquid. The discharge port is set at the bottom of the working barrel to discharge the workpiece and grinding debris. The sealing plug is used to detachably seal the discharge port. The auxiliary component is set on the outside of the working barrel to separate the magnetic needle and the workpiece. The rotating ring is used to move up and down in the vertical direction of the working barrel and surround the outer wall of the working barrel. The second electromagnet is used to generate radial magnetic attraction force on the inner wall of the rotating ring. The translation component is set on the side frame and cooperates with the second electromagnet and the first electromagnet to form a three-dimensional pulse cutting effect and drive the working barrel to move horizontally back and forth. The water spray pipe is set on the frame to rinse the inside of the working barrel.

[0008] Preferably, the turntable is provided with eight first electromagnets, which are divided into an inner circle and an outer circle, with four electromagnets in each circle and arranged around the circumference of the turntable.

[0009] By adopting the above technical solution, the turntable is used to support eight first electromagnets. The eight first electromagnets are divided into inner and outer circles, with four in each circle arranged around the circumference of the turntable, thereby forming a stable rotating magnetic field in the working area.

[0010] Preferably, the translation component includes a second driving member fixedly connected to the side frame. The output end of the second driving member is provided with a rotating plate. A connecting rod is rotatably connected to the end of the rotating plate away from the output end of the second driving member. A connecting seat is rotatably connected to the end of the connecting rod away from the rotating plate. A magnetic shielding plate is fixedly connected to the connecting seat. Slide plates are fixedly connected to both ends of the magnetic shielding plate. Two limiting rods are fixedly connected between the frame and the side frame. The slide plates are slidably connected to the limiting rods.

[0011] By adopting the above technical solution, in the translation component, the second driving component is used to fixally connect to the side frame and provide horizontal reciprocating power, the rotating plate is used to be set at the output end of the second driving component and rotate with it, the connecting rod is used to rotatably connect the end of the rotating plate away from the output end to the connecting seat, the connecting seat is used to fixally connect to the magnetic shielding plate, the magnetic shielding plate is used to fixally connect to the slide plate at both ends and isolate the magnetic force and carry the work bucket, the slide plate is used to slidely connect to the limiting rod, the limiting rod is used to fixally connect between the frame and the side frame and guide the slide plate, thereby making the work bucket move horizontally reciprocating.

[0012] Preferably, the auxiliary component includes a mounting plate fixedly connected to the slide plate, a third driving component fixedly connected to the mounting plate, a bevel gear set provided at the output end of the third driving component, a lead screw fixedly connected to the end of the bevel gear set away from the third driving component, the lead screw being rotatably connected to the mounting plate through it, a nut being threaded onto the lead screw, a connecting plate being fixedly connected to the nut, and the connecting plate being fixedly connected to the rotating ring.

[0013] By adopting the above technical solution, in the auxiliary components, the mounting plate is used to fix and connect the slide plate and support the third drive component, the third drive component is used to provide lifting power, the bevel gear set is used to connect the output end of the third drive component to the lead screw and change the transmission direction, the lead screw is used to be rotatably connected to the mounting plate, the nut is used to be threadedly connected to the lead screw and move along the lead screw, the connecting plate is used to fix and connect the nut and the rotating ring, and the rotating ring is used to lift and move under the drive of the connecting plate and drive the second electromagnet to move.

[0014] Preferably, the auxiliary component further includes a guide rail fixedly connected to the surface of the mounting plate, and the connecting plate slides with the guide rail.

[0015] By adopting the above technical solution, in the auxiliary components, the guide rail is used to be fixedly connected to the surface of the mounting plate and to guide the connecting plate, and the connecting plate is used to slide with the guide rail and drive the rotating ring to rise and fall smoothly.

[0016] Preferably, the magnetic shielding plate is located between the first electromagnet and the second electromagnet to isolate the magnetic force between the first electromagnet and the second electromagnet, and the working bucket is detachably disposed above the magnetic shielding plate.

[0017] By adopting the above technical solution, the magnetic shielding plate is used to be located between the first electromagnet and the second electromagnet to isolate their magnetic forces, and the working bucket is detachably set above the magnetic shielding plate.

[0018] Preferably, the rotating ring is in a partially circular shape, and the second electromagnet is arranged in a circumferential array along the inner wall of the rotating ring.

[0019] By adopting the above technical solution, the rotating ring is used to form an incomplete circular shape and surround the working barrel, and the second electromagnet is used to be arranged in a circumferential array along the inner wall of the rotating ring, thereby forming a radial magnetic field on the side wall and rising and falling with the rotating ring.

[0020] Preferably, the first driving member, the second driving member, and the third driving member are all configured as motors, and the first electromagnet and the second electromagnet are both electromagnets that are independently switched on and off.

[0021] By adopting the above technical solution, the first driving component, the second driving component, and the third driving component are all used as motors to provide power, and the first electromagnet and the second electromagnet are used to independently switch on and off, thereby controlling the bottom rotating magnetic field and the side wall radial magnetic field respectively.

[0022] Preferably, the frame is further provided with a cooling fan and a guide plate, the guide plate is arranged in the direction corresponding to the discharge port, and the cooling fan is directed towards the first electromagnet to dissipate heat from it.

[0023] By adopting the above technical solution, a cooling fan is installed on the frame and faces the first electromagnet to dissipate heat, and a guide plate is installed on the frame and is positioned in the direction of the discharge port to guide airflow.

[0024] Preferably, the water spray pipe is installed on the mobile terminal of the working barrel, and the outlet of the water spray pipe faces the inside of the working barrel, for washing the workpiece and grinding debris during material discharge.

[0025] By adopting the above technical solution, the water spray pipe is used to install on the mobile terminal of the working barrel, and the water outlet of the water spray pipe is directed towards the inside of the working barrel to wash the workpiece and grinding debris during material discharge.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. This application utilizes a rotating magnetic field from a first electromagnet at the bottom to provide the basic circumferential cutting motion of the magnetic needle. A translation component drives the working barrel to reciprocate horizontally at a frequency of 0.5 to 2 Hz, giving the fluid inside the barrel lateral inertial force. This breaks the original planar swirling flow, creating three-dimensional turbulence, and the magnetic needle is repeatedly thrown into the narrow slits and vertical grooves on the side wall of the insert. A second electromagnet in a rotating ring reciprocates vertically up and down along the outer wall of the working barrel. When the electromagnet approaches the bottom of the barrel, the total magnetic field strength is enhanced, and the magnetic needle is attracted towards the bottom and penetrates into the narrow slit. When the electromagnet moves away, the magnetic field strength decreases, and the magnetic needle floats back to the main field, carrying away abrasive debris. These three motions are orthogonally superimposed in space, enabling the magnetic needle to form a regular reciprocating motion in and out of narrow slits and dead zones, reducing the blind zone problem in traditional magnetic polishing where abrasive cannot effectively penetrate narrow slit areas.

[0027] 2. This application employs a coordinated separation scheme involving the complete demagnetization of the first electromagnet at the bottom and the radial magnetic attraction of the second electromagnet on the side wall. This achieves the separation of the magnetic needle from the workpiece. After the separation process begins, the first drive motor stops and the power supply to the first electromagnet is completely cut off. The bottom magnetic field disappears, and the magnetic needle, losing its axial attraction, naturally loosens and suspends in the liquid. Simultaneously, the third drive component, through a bevel gear set and a lead screw mechanism, drives the rotating ring equipped with the second electromagnet to rise to the upper part of the working barrel. The second electromagnet, energized, generates a magnetic field, attracting the magnetic needle to the inner side wall of the working barrel. Because the magnetic field strength in the central region of the barrel decreases rapidly with distance, the magnetic attraction force on the steel insert is much less than its own weight, and it naturally sinks to the bottom of the barrel under the action of gravity. At this time, the translation component switches to a low-speed mode, causing the working barrel to shake slightly, completely loosening and detaching the magnetic needles deposited at the bottom and in the gaps, avoiding magnetic needle residue, and facilitating the full attraction of the magnetic needles by the second electromagnet.

[0028] After the magnetic needle is fully attracted, open the bottom seal of the working barrel and turn on the water spray pipe. The workpiece is discharged from the bottom along with the grinding liquid. The rinsing nozzle washes away the residual grinding debris from top to bottom. The magnetic needle is fixed to the side wall by magnetic force and cannot pass through the discharge port, thus achieving efficient separation between the magnetic needle and the workpiece.

[0029] 3. This application divides the polishing process into a dimensional accuracy control stage and a material removal stage, both implemented on the same equipment platform. In the dimensional accuracy control stage, a gentle and uniform finishing process is achieved solely through the rotating magnetic field generated by the first electromagnet array combined with the turbulent effect of the translation component, resulting in low processing stress and precise controllable material removal. Upon entering the material removal stage, two sets of magnetic components operate in tandem. The rotating magnetic field at the bottom drives the magnetic needle to generate a high-speed circular cutting motion, while the vertical reciprocating motion of the annular second electromagnet on the sidewall periodically changes the axial magnetic field strength within the barrel. The horizontal reciprocating motion of the translation component imparts lateral inertial force to the fluid. The horizontal inertial pulses and vertical magnetic pulses are orthogonally superimposed in three-dimensional space, forming a three-dimensional pulse cutting effect. The magnetic needle generates a reciprocating trajectory of "throwing in—drawing in—throwing out—floating" within the complex cavity, rapidly peeling away the loose remelted white layer and surface microcracks, thus improving removal efficiency. Attached Figure Description

[0030] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this application; Figure 2 This is a top view of the overall structure of this application; Figure 3 This is a schematic diagram of the internal structure of the rack in this application; Figure 4 This is a schematic diagram of the position distribution structure of the first electromagnet in this application; Figure 5 This is an exploded view of the auxiliary components and translation components of this application; Figure 6 for Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 This is a schematic diagram of the auxiliary component structure of this application; Figure 8 for Figure 7 Enlarged structural diagram at point B; Figure 9 This is a schematic diagram of the position distribution structure of the second electromagnet in this application; Figure 10 This is a partial structural diagram of the translation component of this application.

[0031] Reference numerals: 1. Frame; 11. First drive unit; 12. Turntable; 13. First electromagnet; 14. Cooling fan; 15. Guide plate; 2. Side frame; 3. Working barrel; 31. Discharge port; 32. Sealing plug; 4. Translation component; 41. Second drive component; 42. Rotating plate; 43. Connecting rod; 44. Connecting seat; 45. Slide plate; 46. Limiting rod; 47. Magnetic shielding plate; 5. Auxiliary components; 51. Mounting plate; 52. Third drive component; 53. Lead screw; 54. Nut; 55. Bevel gear set; 56. Guide rail; 57. Connecting plate; 58. Rotary ring; 59. Second electromagnet; 6. Water spray pipe. Detailed Implementation

[0032] The following is in conjunction with the appendix Figures 1-10 This application will be described in further detail.

[0033] This application discloses a wire EDM polishing device for mold processing.

[0034] Reference Figure 1 A wire cutting and polishing device for mold processing includes a frame 1 and a side frame 2 fixedly connected to the frame 1. The basic support of the device is composed of the frame 1 and the side frame 2. Specifically, the frame 1 is welded from Q235 carbon steel profiles and has a vertical cabinet-like structure with a horizontal worktable at the top and a hollow mounting cavity inside. The side frame 2 is made of aluminum alloy profiles and is fixedly connected to one side of the top worktable of the frame 1 by bolts.

[0035] A first drive unit 11 is vertically fixed to the inner base plate of the frame 1 by bolts. The first drive unit 11 is a geared motor with its output shaft facing vertically upward. The top of the output shaft of the first drive unit 11 is fixedly connected to a turntable 12 by a flat key. The turntable 12 is made of non-magnetic aluminum alloy and is in the shape of a horizontal disc, parallel to the top worktable surface of the frame 1. Eight first electromagnets 13 are embedded on the upper surface of the turntable 12. The eight first electromagnets 13 are divided into inner and outer rings, with four in each ring, evenly distributed along the circumference of the turntable 12. The first electromagnets 13 are cylindrical DC electromagnets, which are fixed in the mounting holes of the turntable 12 by epoxy resin potting. The magnetic poles are all vertically upward. The eight first electromagnets 13 are continuously powered in the rotating state by matching mercury slip rings, supporting independent on / off control and stepless adjustment of output power. The above structure is used to generate a basic rotating magnetic field to provide the main force for polishing and cutting.

[0036] Cooling fans 14 are bolted to both sides inside the frame 1. The cooling fans 14 are axial flow fans with the air outlet facing upward toward the first electromagnet 13. They are used to cool the electromagnet during operation. A guide plate 15 is welded to the outer wall of the frame 1. The guide plate 15 is a thin steel plate and is inclined to the direction below the discharge port 31. It is used to guide and buffer the falling material.

[0037] The translation component 4 is located between the top worktable of the frame 1 and the side frame 2, and is used to drive the working barrel 3 to perform horizontal reciprocating translational motion to reconstruct the flow field pattern inside the barrel. The outer side wall of the side frame 2 is horizontally fixed to a second drive component 41 by bolts. The second drive component 41 is a gear reduction motor, and its output shaft passes horizontally through the mounting hole of the side frame 2. The output shaft end of the second drive component 41 is fixedly connected to a rotating plate 42 by a flat key. The rotating plate 42 is a rectangular steel plate that rotates coaxially with the output shaft of the second drive component 41. At the end face of the rotating plate 42 away from the second drive component 41 and at an off-center position, a connecting rod 43 is hinged to it by a pin. The connecting rod 43 is a round steel rod with fisheye joints at both ends, and a connecting seat 44 is hinged to the other end by a pin. The connecting seat 44 is a steel block structure that is fixedly connected to the center of the bottom surface of the magnetic shielding plate 47 by bolts.

[0038] The magnetic shielding plate 47 is made of 304 austenitic stainless steel and is horizontally arranged directly above the first electromagnet 13 and directly below the working barrel 3. It is used to isolate the magnetic interference between the first electromagnet 13 and the second electromagnet 59 and prevent the upper and lower magnetic fields from affecting each other. The bottom ends of the magnetic shielding plate 47 are each fixedly connected to a sliding plate 45 by bolts. The sliding plate 45 is a linear bearing seat. Two parallel limiting rods 46 are horizontally fixed between the inner side of the worktable of the frame 1 and the inner side wall of the side frame 2 by bearing seat bolts. The limiting rods 46 are chrome-plated optical shafts. The sliding plate 45 is slidably sleeved on the limiting rods 46. The second driving component 41, the rotating plate 42, the connecting rod 43, the connecting seat 44, the sliding plate 45, and the limiting rods 46 together constitute a crank-slider transmission mechanism, which converts the rotational motion of the motor into the horizontal reciprocating linear motion of the magnetic shielding plate 47. The working bucket 3 can be detachably placed on the positioning step on the upper surface of the magnetic shielding plate 47 and fixed by three sets of quick buckles on the side, and moves horizontally back and forth synchronously with the magnetic shielding plate 47.

[0039] The auxiliary component 5 is mounted on the slide plate 45 of the translation component 4 and moves horizontally synchronously with the working barrel 3. Simultaneously, it can independently drive the second electromagnet 59 to rise and fall vertically, used to adjust the magnetic field strength and achieve magnetic separation. The specific structure is as follows: A mounting plate 51 is bolted to the side wall of one side of the slide plate 45. The mounting plate 51 is an irregularly shaped vertical aluminum alloy plate with its vertical edge extending upwards. A third drive component 52 is bolted to the outer top of the mounting plate 51. The third drive component 52 is a forward and reverse geared motor, with its output shaft horizontally passing through the side wall of the mounting plate 51. A bevel gear set 55 is connected to the output shaft of the third drive component 52. The bevel gear set 55 includes a meshing active bevel gear and a driven bevel gear. The active bevel gear is fixedly connected to the output shaft of the third drive component 52 via a key, and the driven bevel gear is fixedly connected to the lower end of a lead screw 53 via a key. The lead screw 53 is a ball screw, arranged vertically, with its upper and lower ends rotatably connected to the vertical side wall of the mounting plate 51 via bearings. A nut 54, a ball screw nut, is threaded onto the lead screw 53 and is bolted to one side of the connecting plate 57, which is made of steel. A rotating ring 58 is bolted to the other side of the connecting plate 57. A guide rail 56 is vertically fixed to the vertical side wall of the mounting plate 51 by bolts. A slider is fixed to the back of the connecting plate 57, and the slider slides against the guide rail 56, providing vertical guidance for the lifting and lowering movement of the rotating ring 58 and preventing deflection and jamming. The rotating ring 58 is in a partially circular shape (C-shaped opening structure), made of non-magnetic aluminum alloy, and is arranged around the outer side of the working barrel 3. Nine second electromagnets 59 are evenly embedded along the circumference of the inner wall of the rotating ring 58. The second electromagnets 59 are cylindrical DC electromagnets, with their poles arranged radially inward along the working barrel 3 to generate a radial magnetic field. The second electromagnets 59 support independent on / off control, and the magnetic field strength can be changed by adjusting the current.

[0040] The working barrel 3 is made of non-magnetic PP polypropylene and is cylindrical with an open top, effectively shielding against magnetic fields and preventing liquid splashing during operation. A square discharge port 31 is located on one side of the bottom of the working barrel 3. A removable sealing plug 32, made of nitrile rubber, is installed inside the discharge port 31 via an interference fit, ensuring a seal during polishing and allowing for quick removal during discharge. A water spray pipe 6, made of PVC or stainless steel, is fixedly mounted on the frame 1 via a bracket. When the working barrel 3 is moved to a position away from the second drive component 41, its outlet faces inwards. The water spray pipe 6 is connected to a flexible high-pressure water source to rinse the workpiece and grinding debris from top to bottom during discharge, ensuring thorough removal.

[0041] The first driving component 11, the second driving component 41, the third driving component 52, the first electromagnet 13, and the second electromagnet 59 are all electrically connected to the control unit. The control unit is a PLC or industrial computer, configured to control the start / stop, speed, and direction of each driving component, as well as the on / off state and current magnitude of each electromagnet, thereby sequentially executing the dimensional accuracy control stage, the magnetic needle-workpiece separation stage, and the main material removal stage.

[0042] This equipment uses a PLC or industrial computer as the control unit. The power supply is transmitted to the servo drivers of the first drive unit 11, the second drive unit 41, and the third drive unit 52, the controllable DC power supply of the first electromagnet 13 and the second electromagnet 59, the cooling fan 14, and the solenoid valve of the water spray pipe 6 via circuit breakers, contactors, and relays. The power supply line of the first electromagnet 13 is introduced into the turntable 12 through a mercury slip ring installed between the output shaft of the first drive unit 11 and the turntable 12 to ensure that the first electromagnet 13 is continuously energized when the turntable 12 rotates. The line of the second electromagnet 59 that moves up and down with the rotating ring 58 is connected by a drag chain or a follower slip ring. The solenoid valves of each driver, electromagnet power supply, cooling fan 14, and water spray pipe 6, as well as the automatic opening and closing mechanism of the sealing plug 32, are all electrically connected to the control unit. Before startup, the equipment is in its initial state, i.e., the first drive component 11 is stopped, the first electromagnet 13 and the second electromagnet 59 are de-energized, the turntable 12 is in its initial middle position, the translation component 4 is in its stroke middle position, the rotating ring 58 and the second electromagnet 59 are in their lower positions, and the discharge port 31 is blocked by the blockage 32. The operator opens the top cover of the working bucket 3 and puts in the mold insert to be polished, stainless steel magnetic needle, polishing fluid and clean water according to the process ratio, and then tightens the bucket cover. After receiving the start signal, the equipment enters the automatic operation process by the control unit: first, the dimensional accuracy control stage is executed, controlling the first drive component 11 to drive the turntable 12 to accelerate to the set speed, so that the first electromagnet 13 is energized through the mercury slip ring to generate a stable rotating magnetic field, and at the same time, controlling the second drive component 41 The working barrel 3 is driven to move horizontally and reciprocally at a constant speed along the limiting rod 46 by the rotating plate 42, connecting rod 43, connecting seat 44, magnetic shielding plate 47 and sliding plate 45 to achieve a smooth and uniform finishing process; then the separation stage of magnetic needle and workpiece is performed, the first driving component 11 is stopped and the power supply of the first electromagnet 13 is cut off, the third driving component 52 is controlled to drive the rotating ring 58 to rise to the upper part of the working barrel 3 through the bevel gear set 55, lead screw 53, nut 54 and connecting plate 57, and at the same time, the second electromagnet 59 is energized to generate radial magnetic attraction force on the side wall, the second driving component 41 is controlled to switch to low speed mode to loosen the magnetic needle and be attracted, and the workpiece sinks. After a delay of 2 to 3 seconds, the sealing plug 32 is controlled to open the discharge port 31 and the water spray pipe 6 is turned on to flush the discharge. Finally, in the main material removal stage, the first drive unit 11 is controlled to drive the turntable 12 to the rated speed and supply the first electromagnet 13 with full power. The second drive unit 41 is controlled to drive the working barrel 3 to move horizontally back and forth at a frequency of 0.5 to 2 Hz. The second electromagnet 59 is controlled to be energized and the third drive unit 52 is controlled to rotate forward and backward to drive the second electromagnet 59 to move vertically back and forth along the outer wall of the working barrel 3. This causes the bottom rotating magnetic field, horizontal inertial pulse and vertical magnetic pulse to be orthogonally superimposed to form a three-dimensional pulse cutting effect, thereby completing the efficient removal of the wire-cut white layer.

[0043] The implementation principle of a wire EDM polishing device for mold processing according to an embodiment of this application is as follows: Initial feeding state: The first drive component 11 stops, the first electromagnet 13 is de-energized and has no magnetic field output, and the turntable 12 stops at the initial middle position; the translation component 4 is at the middle position of its stroke, driving the working barrel 3 and the auxiliary component 5 to stop together at the center position of the equipment; the third drive component 52 is in the lower position, the second electromagnet 59 is de-energized and has no magnetism, and stops at the lower outer part of the working barrel 3; the sealing plug 32 plugs the discharge port 31. Open the top cover of the working barrel 3, put in the mold insert to be polished, stainless steel magnetic needle, polishing fluid and clean water according to the process ratio, the liquid level is above the top of the workpiece; after tightening the barrel cover, the equipment receives the start signal and enters the automatic operation process.

[0044] Strong magnetic coarse polishing stage (main material removal): The first drive component 11 is activated, driving the turntable 12 and the first electromagnet 13 to rotate at the rated speed; at the same time, the first electromagnet 13 is energized at full power, continuously powered through the mercury slip ring, generating a stable high-speed rotating magnetic field, driving the stainless steel magnetic needles in the barrel to generate high-speed circular rotation and revolution, forming the basic cutting motion. The second drive component 41 of the translation component 4 is activated, driving the magnetic shielding plate 47, the working barrel 3, and the auxiliary component 5 to perform horizontal uniform reciprocating translation at a frequency of 0.5 to 2 Hz through the crank-slider mechanism, so that the fluid in the barrel and the magnetic needles are superimposed with lateral inertial force, breaking the original planar swirling flow and forming three-dimensional turbulence; the magnetic needles are repeatedly thrown into the narrow slits and vertical grooves on the side wall of the insert, solving the polishing dead angle problem of the planar flow field. Simultaneously, the second electromagnet 59 is energized, and the third driving component 52 performs alternating forward and reverse motion. Through the bevel gear set 55 and the lead screw 53, the rotating ring 58 and the second electromagnet 59 move vertically up and down along the outer wall of the working barrel 3, periodically changing the axial magnetic field strength inside the barrel. When the second electromagnet 59 is close to the bottom of the barrel, the total magnetic field strength is enhanced, and the magnetic needle is sucked into the bottom of the groove and hole to impact the white layer. When it moves away, the magnetic field strength drops, and the magnetic needle floats back to the main field to carry away the grinding debris. The horizontal inertial pulse and the vertical magnetic pulse are orthogonally superimposed to form a three-dimensional spatial pulse cutting effect. The magnetic needle produces a reciprocating motion of "throwing in - sucking in - throwing out - floating" in the complex cavity, quickly peeling off the wire-cut remelted white layer and surface micro-cracks. This effect cannot be achieved by a single translation component 4 or a single auxiliary component 5. The overall white layer removal efficiency is improved compared to the conventional single main magnetic field structure. During the process, the magnetic isolation plate 47 continuously isolates the magnetic forces of the first electromagnet 13 and the second electromagnet 59 to avoid mutual interference between the magnetic fields and ensure stable cutting effect.

[0045] Weak magnetic polishing stage (dimensional accuracy control): The second electromagnet 59 is turned off, and the auxiliary magnetic field disappears completely; at the same time, the output power of the first electromagnet 13 is reduced to weaken the intensity of the basic rotating magnetic field; the translation component 4 maintains uniform reciprocating translation to maintain the three-dimensional turbulent state inside the barrel. In this stage, the cutting force is gentle and uniform, and the magnetic needle sweeps evenly across all surfaces of the workpiece, smoothing out microscopic protrusions. While ensuring the white layer removal effect, the surface roughness is precisely controlled to avoid excessive cutting that could damage the dimensional accuracy of the insert, achieving a smooth and uniform finishing process.

[0046] Magnetic separation and discharge stage: The first drive unit 11 stops, and the power supply to the first electromagnet 13 is completely cut off. The bottom magnetic field disappears completely with zero residue, and the magnetic needles lose their axial attraction and naturally loosen and suspend in the liquid. The translation component 4 switches to low-speed mode, and the short stroke and low frequency drive the working barrel 3 to shake slightly, so that the magnetic needles deposited at the bottom and in the gaps of the barrel are completely loosened and detached, avoiding residue and facilitating subsequent magnetic attraction. The third drive unit 52 starts, and the lead screw 53 drives the rotating ring 58 to rise to the middle and upper height of the working barrel 3; at the same time, the second electromagnet 59 is energized at full power, generating a strong radial magnetic field, which firmly attracts all the stainless steel magnetic needles to the inner wall of the working barrel 3; the magnetic field strength in the central area of ​​the barrel decreases rapidly with distance, and the magnetic attraction force on the steel inserts is much less than their own weight, so they sink to the bottom of the barrel under the action of gravity. After a 2-3 second delay to allow the magnetic needle to fully adhere, remove the sealing plug 32, open the discharge port 31, and simultaneously turn on the water spray pipe 6. The workpiece is discharged from the bottom along with the grinding liquid, and the grinding debris is discharged synchronously with the liquid. The water spray pipe 6 rinses from top to bottom, carrying away the remaining tiny grinding debris and impurities, while the magnetic needle is fixed to the side wall by magnetic force and cannot pass through, thus achieving automatic separation of the workpiece and the magnetic needle and improving separation efficiency.

[0047] Reset and waiting stage: shut off the water spray pipe 6 and re-tighten the sealing plug 32 to the discharge port 31; the second electromagnet 59 is de-energized, the radial magnetic field disappears, and the magnetic needles adsorbed on the barrel wall fall back to the bottom of the barrel under the action of gravity; the third drive component 52 reverses, driving the rotating ring 58 to descend and reset to the lower part of the working barrel 3; the translation component 4 returns to the middle position, the equipment returns to the initial state, and waits for the next batch of material to be fed.

[0048] The above are merely optional embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A wire EDM polishing device for mold processing, characterized in that: The machine includes a frame (1) and a side frame (2) fixedly connected to the frame (1). A first driving component (11) is provided inside the frame (1). A turntable (12) is provided at the driving end of the first driving component (11). A first electromagnet (13) is provided on the turntable (12). A working bucket (3) is provided on the table surface of the frame (1) at the position corresponding to the turntable (12). A discharge port (31) is provided at the bottom of the working bucket (3). A sealing plug (32) is detachably provided inside the discharge port (31). An auxiliary component (5) for separating the magnetic needle from the workpiece is provided on the outside of the working barrel (3). The auxiliary component (5) includes a rotating ring (58) that moves up and down in the vertical direction of the working barrel (3). The rotating ring (58) is arranged around the outer wall of the working barrel (3). At least five second electromagnets (59) are provided on the inner wall of the rotating ring (58). A translation component (4) is provided on the side frame (2) for cooperating with the second electromagnets (59) and the first electromagnet (13) to form a three-dimensional pulse cutting effect. The output end of the translation component (4) is connected to the bottom of the working barrel (3) and drives the working barrel (3) to move horizontally back and forth. A water spray pipe (6) for rinsing the inside of the working barrel (3) is provided on the frame (1).

2. The wire cutting and polishing equipment for mold processing according to claim 1, characterized in that: The turntable (12) is provided with eight first electromagnets (13), which are divided into inner and outer rings, with four in each ring and arranged around the circumference of the turntable (12).

3. The wire cutting and polishing equipment for mold processing according to claim 1, characterized in that: The translation component (4) includes a second drive member (41) fixedly connected to the side frame (2). The output end of the second drive member (41) is provided with a rotating plate (42). The end of the rotating plate (42) away from the output end of the second drive member (41) is rotatably connected to a connecting rod (43). The end of the connecting rod (43) away from the rotating plate (42) is rotatably connected to a connecting seat (44). The connecting seat (44) is fixedly connected to a magnetic shielding plate (47). Both ends of the magnetic shielding plate (47) are fixedly connected to a sliding plate (45). Two limiting rods (46) are fixedly connected between the frame (1) and the side frame (2). The sliding plate (45) is slidably connected to the limiting rods (46).

4. The wire cutting and polishing equipment for mold processing according to claim 3, characterized in that: The auxiliary component (5) includes a mounting plate (51) fixedly connected to the slide plate (45). A third drive component (52) is fixedly connected to the mounting plate (51). A bevel gear set (55) is provided at the output end of the third drive component (52). A lead screw (53) is fixedly connected to the end of the bevel gear set (55) away from the third drive component (52). The lead screw (53) is rotatably connected to the mounting plate (51). A nut (54) is threaded onto the lead screw (53). A connecting plate (57) is fixedly connected to the nut (54). The connecting plate (57) is fixedly connected to the rotating ring (58).

5. A wire EDM polishing device for mold processing according to claim 4, characterized in that: The auxiliary component (5) also includes a guide rail (56) fixedly connected to the surface of the mounting plate (51), and the connecting plate (57) slides with the guide rail (56).

6. The wire cutting and polishing equipment for mold processing according to claim 3, characterized in that: The magnetic shielding plate (47) is located between the first electromagnet (13) and the second electromagnet (59) to isolate the magnetic force between the first electromagnet (13) and the second electromagnet (59). The working barrel (3) is detachably disposed above the magnetic shielding plate (47).

7. A wire EDM polishing device for mold processing according to claim 4, characterized in that: The rotating ring (58) is in a partially circular shape, and the second electromagnet (59) is arranged in a circumferential array along the inner wall of the rotating ring (58).

8. The wire cutting and polishing equipment for mold processing according to claim 4, characterized in that: The first driving component (11), the second driving component (41) and the third driving component (52) are all motors, and the first electromagnet (13) and the second electromagnet (59) are electromagnets that are independently switched on and off.

9. A wire EDM polishing device for mold processing according to claim 1, characterized in that: The frame (1) is also provided with a cooling fan (14) and a guide plate (15). The guide plate (15) is arranged in the direction corresponding to the discharge port (31), and the cooling fan (14) is directed toward the first electromagnet (13) to dissipate heat from it.

10. A wire EDM polishing device for mold processing according to claim 1, characterized in that: The water spray pipe (6) is installed on the mobile terminal of the working barrel (3), and the outlet of the water spray pipe (6) faces the inside of the working barrel (3) for rinsing the workpiece and grinding debris during material discharge.

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