Intelligent automatic threading numerical control wire cutting machine tool

Abstract

The application discloses an intelligent automatic wire threading numerical control wire cutting machine tool, and relates to the technical field of wire cutting machine tools, which comprises a machine tool, a wire coiling cylinder, a wire pressing mechanism and a wire threading mechanism are arranged on the machine tool, an electrode wire is coiled on the wire coiling cylinder, the wire threading mechanism comprises a wire lower frame, a limiting plate, a wire clamping movable chuck, a limiting frame, a first moving device, a wire connector, a guide pin wire and a connecting part, a water nozzle is penetrated through the limiting plate, the guide pin wire is clamped through the wire clamping movable chuck, then the wire clamping movable chuck is driven by the first moving device, so that the guide pin wire can move towards the limiting frame and is finally clamped by the wire connector, thereby forming a wire conveying closed loop of the electrode wire, the wire connector, the connecting part and the wire coiling cylinder, when the guide pin wire is driven by the wire clamping movable chuck and the first moving device towards the limiting frame during automatic wire threading, the guide pin wire passes through the hole position on the workpiece, automatic wire threading of the workpiece is realized, problems encountered in manual wire threading are effectively avoided, manual cost is effectively reduced, and work efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of wire EDM machine tool technology, specifically to intelligent automatic wire-threading CNC wire EDM machine tools for wire feeding and fast wire feeding. Background Technology

[0002] Wire EDM machines use molybdenum wire or hard brass wire as the electrode wire. Under the action of high-frequency pulse voltage, the liquid medium is broken down, forming an electric spark discharge. At the same time, heat is generated, causing localized melting of the metal on the workpiece surface (also called electro-erosion). Simultaneously, the cutting fluid washes the cutting area, and the electrode wire is moved by the controller to form a preset shape and size on the workpiece. Traditional wire EDM machines mostly use manual wire threading. The wire loading, unloading, and threading process of traditional wire EDM machines is mainly as follows: one end of the electrode wire is fixed on the wire coil and wound up, and the other end of the electrode wire is passed upward through the workpiece and connected to the screw on the wire coil; after the workpiece is processed, the electrode wire is unloaded from the screw on the wire coil and then removed from the workpiece; when changing the workpiece or changing the processing position of the workpiece, the electrode wire is passed upward through the workpiece and finally connected to the screw on the wire coil. When threading the wire, the cutting fluid on the workbench often drips onto hands and clothes, which is dirty and not environmentally friendly. In addition, because the diameter of the wire is small, it is difficult to thread the wire manually, which is time-consuming, labor-intensive and slow.

[0003] With the development of the times and the increase in labor costs, the pain point of slow work efficiency caused by manual wire threading has become more prominent. Based on years of industry experience and research experiments, the inventor has invented an intelligent automatic wire threading CNC wire cutting machine. Summary of the Invention

[0004] To overcome the shortcomings mentioned above, the present invention aims to provide a technical solution that can solve the above problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an intelligent automatic wire-threading CNC wire cutting machine tool, comprising a machine tool, a wire coiling spool, a wire pressing mechanism, and a wire threading mechanism; the wire threading mechanism includes a lower wire frame mounted on the machine tool, on which a limit plate, a wire-clamping movable chuck, and a limit frame are sequentially arranged from top to bottom; a water nozzle facing the limit frame is threaded through the limit plate; a first moving device is mounted on the lower wire frame, the moving part of the first moving device is connected to the wire-clamping movable chuck, and the first moving device is used to drive the wire-clamping movable chuck to move back and forth between the limit plate and the limit frame; a connector is provided on the limit frame, and the connector is connected to the wire coiling spool through a connecting part, the wire coiling spool drives the connector to wind onto the wire coiling spool through the connecting part. The threading mechanism also includes a tubular needle wire that can be fitted and fixed on the electrode wire. The width of the needle wire is greater than the width of the opening on the water nozzle facing the limiting frame, and the length of the needle wire is less than the distance from the limiting plate to the connector. The wire clamping chuck has a clamping state for clamping the needle wire and a loosening state for releasing the needle wire. The connector has a wiring state for clamping the needle wire and a wire unwinding state for releasing the needle wire. The electrode wire is wound on the coiling spool. One end of the electrode wire is fixed on the coiling spool, and the other end of the electrode wire passes through the pressing mechanism and the water nozzle on the limiting plate in sequence before being threaded onto the needle wire. The direction in which the electrode wire passes through the water nozzle is from the side of the limiting plate away from the limiting frame. The pressing mechanism is used to tension the electrode wire.

[0006] As a further aspect of the present invention, the usage steps include:

[0007] The electrode wire is fed into the coil. One end of the electrode wire is fixed on the coiling drum and wound up. The other end of the electrode wire passes through the wire pressing mechanism and the water nozzle on the limiting plate in sequence and then passes through the needle wire. The needle wire is then moved to the connector and the connector is put into the wire receiving state. Finally, the connector is wound onto the coiling drum through the drive device and the connecting part. The electrode wire, the needle wire, the connector, the connecting part and the coiling drum form a closed loop of wire feeding.

[0008] Automatic wire withdrawal: The drive device moves the wire coiling drum to the limit frame and puts the wire withdrawal device in the wire withdrawal state. Then, the wire pressing mechanism tensions the electrode wire, so that the lead wire is pulled up relative to the limit frame.

[0009] Automatic threading and clamping chuck clamp the needle thread. The first moving device drives the clamping chuck to move towards the limit frame so that the needle thread moves to the connector. Then the connector is put into the thread receiving state. Finally, the coiling spool drives the connector to wind onto the coiling spool through the connecting part.

[0010] As a further aspect of the present invention: after the wire feeding step is completed, the driving device drives the coiling drum to perform a wire feeding test and / or the driving device drives the coiling drum to cut the workpiece; wherein, before the driving device drives the coiling drum to cut the workpiece, the guide wire first passes through the workpiece or through the hole on the workpiece before moving to the connector.

[0011] As a further aspect of the present invention: before performing the automatic wire threading step, the workpiece is placed, the workpiece is changed, or the processing position of the workpiece is changed.

[0012] As a further aspect of the present invention: the connector includes an elastic clamp and a connecting rod connected to one end of the elastic clamp; the outer surface of the connection between the connecting rod and the elastic clamp is an adjusting surface, and the adjusting surface is inclined outward toward the elastic clamp; an adjusting sleeve is slidably sleeved on the outer side of the connecting rod; the connecting rod has a first sliding state on the adjusting sleeve that clamps the elastic clamp, and a second sliding state that disengages the elastic clamp from the adjusting sleeve; one end of the connecting rod away from the elastic clamp is connected to a connecting part, and one end of the elastic clamp away from the connecting rod has a clamping opening corresponding to the lead wire; the limiting frame has an elastic clamping assembly, which includes an elastic element and a pressure block connected to the elastic element, the pressure block being used to radially press the adjusting sleeve; the limiting frame also has a stop for restricting the movement of the elastic clamp toward the limiting plate, and when the elastic clamp is blocked and restricted by the stop, the connecting rod is in the second sliding state on the adjusting sleeve.

[0013] As a further aspect of the present invention: the end of the elastic clamp away from the connecting rod has a guide surface, and the guide surface is inclined outward in the direction of the connecting rod.

[0014] As a further aspect of the present invention: the wire pressing mechanism includes a first wire pressing assembly and a wire feeder mounted on a machine tool; the first wire pressing assembly includes an adjusting cylinder mounted on the wire feeder; a first adjusting rod is connected to the telescopic rod of the adjusting cylinder, and the first adjusting rod is parallel to the telescopic rod of the adjusting cylinder; a first adjusting block is connected to one end of the first adjusting rod near the adjusting cylinder, and a second adjusting block is connected to one end of the first adjusting rod away from the adjusting cylinder; a second adjusting rod is connected between the first adjusting block and the second adjusting block, and the first adjusting rod and the second adjusting rod are arranged parallel to each other; a third adjusting block is provided between the first adjusting block and the second adjusting block, and the third adjusting block has a first through hole that slides with the first adjusting rod and a second through hole that slides with the second adjusting rod; a first adjusting spring is provided between the third adjusting block and the first adjusting block, and the first adjusting spring is sleeved on the first adjusting rod; an electrode wire passes between the second adjusting block and the third adjusting block; both the first adjusting block and the second adjusting block are connected to a power source and energized to provide electro-erosion when the electrode wire cuts the workpiece; a guide groove that cooperates with the first adjusting block is provided on the wire feeder.

[0015] As a further aspect of the present invention: the wire pressing mechanism further includes a second wire pressing assembly; the second wire pressing assembly includes an adjusting motor mounted on the upper wire frame, a third adjusting rod and a fourth adjusting rod connected to the rotating shaft of the adjusting motor, the third adjusting rod and the fourth adjusting rod being arranged parallel to each other and perpendicular to the rotating shaft of the adjusting motor; a fixing block is connected to one end of the third adjusting rod away from the rotating shaft of the adjusting motor, a fourth adjusting block is provided between the rotating shaft of the adjusting motor and the fixing block, the fourth adjusting block having a third through hole and a fourth through hole that slide in cooperation with the third adjusting rod; a first tensioning wheel corresponding to the electrode wire is rotatably connected to the fourth adjusting block; a second adjusting spring is provided between the fourth adjusting block and the rotating shaft of the adjusting motor, the second adjusting spring being sleeved on the third adjusting rod.

[0016] As a further aspect of the present invention: the electrode wire is continuously pressed and tensioned by the third adjusting block and the first tensioning wheel, and the tensioning direction of the electrode wire by the third adjusting block is opposite to the tensioning direction of the electrode wire by the first tensioning wheel; there are two first wire pressing assemblies or two second wire pressing assemblies, and the second wire pressing assemblies are located between the two first wire pressing assemblies or the first wire pressing assemblies are located between the two second wire pressing assemblies.

[0017] As a further aspect of the present invention: the coiled wire spool is provided with a storage groove, which is used to store one, two, or all of the electrode wire, connector, and wiring device.

[0018] Compared with existing technologies, the beneficial effects of this invention are as follows: Using this intelligent automatic wire-threading CNC wire EDM machine tool, automatic wire threading can be performed, effectively solving problems such as dirt accumulation, difficulty in threading, and slow work efficiency caused by manual wire threading, thus effectively reducing production costs. Because the electrode wire has elasticity, good hardness, and poor straightness, the design of the guide wire makes it less prone to bending on the part of the electrode wire clamped by the wire-clamping chuck, maintaining a relatively straight state. Under the drive of the wire-clamping chuck and the first moving device, it can smoothly pass through the holes on the workpiece and finally reach the limiting frame. Through the design of the guide wire, automatic wire threading can be achieved on the CNC wire EDM machine tool, and the threading process is more stable and smooth. The water nozzle can straighten the electrode wire on one hand, and on the other hand, the width of the guide wire is set to be greater than the width of the opening on the water nozzle facing the limiting frame. During automatic wire withdrawal, the limiting plate can limit the guide wire, preventing excessive wire withdrawal. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural view of the present invention;

[0020] Figure 2 This is the main structural view of the present invention;

[0021] Figure 3This is a cross-sectional view of the limiting plate in this invention;

[0022] Figure 4 This is a cross-sectional view of the connector structure in this invention;

[0023] Figure 5 This is a schematic diagram of the structure of the first wire pressing assembly in this invention;

[0024] Figure 6 This is a schematic diagram of the structure of the second wire pressing assembly in this invention;

[0025] The numbers in the attached figure are

[0026] Machine tool-1, wire coiling spool-2, wire threading mechanism-3, electrode wire-4, wire pressing mechanism-5, wire lowering frame-31, limiting plate-32, wire clamping moving chuck-33, limiting frame-34, first moving device-35, connector-36, connecting part-37, needle wire-38, wire uppering frame-51, first wire pressing assembly-52, second wire pressing assembly-53, water nozzle-321, elastic clamp-361, connecting rod-362, adjusting surface-363, adjusting sleeve-364, clamp-365, stop-366, elastic Component-367, Pressure block-368, Guide surface-369, Adjusting cylinder-521, First adjusting rod-522, First adjusting block-523, Second adjusting block-524, Second adjusting rod-525, Third adjusting block-526, First adjusting spring-527, Guide groove-528, Adjusting motor-531, Third adjusting rod-532, Fourth adjusting rod-533, Fixing block-534, Fourth adjusting block-535, First tensioning wheel-536, Second adjusting spring-537, Second tensioning wheel-538. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1-6An intelligent automatic wire cutting CNC machine tool includes a machine tool 1, on which a wire coiling spool 2, a wire pressing mechanism 5, and a wire threading mechanism 3 are provided. Electrode wire 4 is wound on the wire coiling spool 2. The wire pressing mechanism 5 is used to tension the electrode wire 4. The wire threading mechanism 3 includes a lower wire support 31 mounted on the machine tool 1. From top to bottom, the lower wire support 31 is provided with a limiting plate 32, a wire clamping movable chuck 33, and a limiting frame 34. A water nozzle 321 facing the limiting frame 34 passes through the limiting plate 32. A first moving device 35 is mounted on the lower wire support 31. The moving part of the first moving device 35 is connected to the wire clamping movable chuck 33, and the first moving device 35 is used to drive the wire clamping movable chuck 33 to move back and forth between the limiting plate 32 and the limiting frame 34. The limiting frame 34 is equipped with a connector 36, which is connected to the coil spool 2 via a connecting part 37. The coil spool 2 drives the connector 36 to wind onto the coil spool 2 via the connecting part 37. The wire threading mechanism 3 also includes a tubular needle wire 38 that can be sleeved and fixed on the electrode wire 4. The width of the needle wire 38 is greater than the width of the opening on the water nozzle 321 facing the limiting frame 34, and the length of the needle wire 38 is less than the distance from the limiting plate 32 to the connector 36. The wire clamping moving chuck 33 has a clamping state for clamping the needle wire 38 and a releasing state for releasing the needle wire 38. The connector 36 has a wire threading state for clamping the needle wire 38 and a wire unwinding state for releasing the needle wire 38. One end of the electrode wire 4 is fixed on the coiling spool 2. The other end of the electrode wire 4 passes through the pressing mechanism 5 and the water nozzle on the limiting plate 32 in sequence, and then passes through the needle wire 38. The direction in which the electrode wire 4 passes through the water nozzle 321 is from the side of the limiting plate 32 away from the limiting frame 34.

[0029] To facilitate control of the coiling drum 2, an external drive device is connected to the coiling drum, preferably a servo motor.

[0030] The usage steps include:

[0031] The electrode wire is fed into the coil. One end of the electrode wire is fixed on the coiling drum and wound up. The other end of the electrode wire passes through the wire pressing mechanism and the water nozzle on the limiting plate in sequence and then passes through the needle wire. The needle wire is then moved to the connector and the connector is put into the wire receiving state. Finally, the connector is wound onto the coiling drum through the drive device and the connecting part. The electrode wire, the needle wire, the connector, the connecting part and the coiling drum form a closed loop of wire feeding.

[0032] Automatic wire withdrawal: The drive device moves the wire coiling drum to the limit frame and puts the wire withdrawal device in the wire withdrawal state. Then, the wire pressing mechanism tensions the electrode wire, so that the lead wire is pulled up relative to the limit frame.

[0033] Automatic threading and clamping chuck clamp the needle thread. The first moving device drives the clamping chuck to move towards the limit frame so that the needle thread moves to the connector. Then the connector is put into the wire-connecting state. Finally, the connector is wound onto the coiling drum by the driving device and the connecting part.

[0034] This intelligent automatic wire threading CNC wire cutting machine tool can automatically thread wires, effectively solving problems such as dirt, difficulty in threading, and slow work efficiency caused by manual wire threading, and effectively reducing production costs.

[0035] Because the electrode wire 4 has elasticity, good hardness, but poor straightness, the guide wire 38 prevents the portion of the electrode wire 4 clamped by the wire clamping chuck 33 from bending, maintaining a relatively straight state. Driven by the wire clamping chuck 33 and the first moving device 35, it can smoothly pass through the holes on the workpiece and finally reach the limit frame 34. The design of the guide wire 38 enables automatic wire threading on the CNC wire cutting machine, making the threading process more stable and smooth.

[0036] The water nozzle 321 serves two purposes: firstly, it straightens the electrode wire 4; secondly, it is designed so that the width of the needle wire 38 is greater than the width of the opening on the water nozzle 321 facing the limiting frame 34. During automatic wire withdrawal, the limiting plate 32 can limit the needle wire 38 to prevent excessive wire withdrawal.

[0037] As an explanation, the drive source of the first moving device is preferably a rotary cylinder; the wire clamping chuck is preferably an electromagnetic clamp; the electrode wire is preferably a molybdenum wire; the needle wire is preferably made of copper, stainless steel or shape memory alloy; the connecting part serves as a transition extension line, and the connecting part can be made of steel wire, steel strip, iron strip, copper strip, copper wire, rubber rope, or wire made of alloy material, etc.; not all of them will be listed here.

[0038] The length of the guide wire can be adjusted according to the size of the workpiece being processed. One set of data for the width of the guide wire and the width of the opening on the water nozzle facing the limit frame is: water nozzle 0.195, guide wire 0.5, where the electrode wire is 0.18 that can pass through the water nozzle. Other sizes can be replaced according to actual needs.

[0039] Preferably, after the yarn feeding step is completed, the drive device drives the yarn coiling drum to perform a yarn feeding test.

[0040] Preferably, after the wire feeding step is completed, the drive device drives the wire coiling drum to cut the workpiece, wherein the wire passes through the workpiece or through a hole on the workpiece before the guide wire is moved to the connector.

[0041] Preferably, before the automatic wire threading step, the workpiece is placed, the workpiece is changed, or the processing position of the workpiece is changed.

[0042] One type of continuous operation involves: first, threading the wire; after testing and confirming normal wire feeding, automatically withdrawing the wire; then, placing the workpiece and automatically threading the wire through the hole in the workpiece; and finally, automatically withdrawing the wire after the wire feeding is completed. After this, the workpiece can be changed or its position adjusted, and then automatically threading and withdrawing the wire again after the wire feeding is completed. This allows for the processing of multiple workpieces and multiple holes in the workpiece without the need for manual threading.

[0043] Preferably, the coiled wire spool is provided with a storage groove (not shown), which is used to store one, two, or all of the electrode wire, connector, and terminal block.

[0044] Preferably, the opening on the water nozzle 321 away from the limiting frame 34 is arranged in a funnel shape that gradually expands outward, making it easier for the electrode wire 4 to pass through the water nozzle 321.

[0045] Furthermore, the connector 36 includes an elastic clamp 361 and a connecting rod 362 connected to one end of the elastic clamp 361; the outer surface of the connection between the connecting rod 362 and the elastic clamp 361 is an adjusting surface 363, and the adjusting surface 363 is inclined outward toward the elastic clamp 361; an adjusting sleeve 364 is slidably sleeved on the outer side of the connecting rod 362; the connecting rod 362 has a first sliding state on the adjusting sleeve 364 in which the elastic clamp 361 is clamped by the adjusting sleeve 364, and a second sliding state in which the elastic clamp 361 is disengaged from the adjusting sleeve 364; one end of the connecting rod 362 away from the elastic clamp 361 is connected to the connecting part 37, and one end of the elastic clamp 361 away from the connecting rod 362 has a clamping opening 365 corresponding to the needle wire 38.

[0046] The limiting frame 34 also has an elastic clamping assembly, which includes an elastic element 367 and a pressure block 368 connected to the elastic element 367. The pressure block 368 is used to radially clamp the adjusting sleeve 364.

[0047] The limiting frame 34 has a stop 366 for limiting the movement of the elastic clamp 361 toward the limiting plate 32. When the elastic clamp 361 is blocked and limited by the stop 366, the connecting rod 362 is in a second sliding state on the adjusting sleeve 364.

[0048] One way to put the connector in the wire-connecting state is as follows: after the lead wire reaches the clamping end of the elastic clamp, the pressure block presses the adjusting sleeve onto the limit frame through the elastic element, and then the connecting rod is driven by the drive device, the coiling drum and the connecting part, so that the elastic clamp is clamped by the adjusting sleeve, and correspondingly the elastic clamp clamps the lead wire.

[0049] One way to put the connector in the wire-removing state is as follows: the drive device drives the coiling drum to move the connector to the limit frame. At this time, the pressure block presses the adjusting sleeve on the limit frame through the elastic element. The electrode wire is further tensioned by the wire pressing mechanism. The tension of the needle wire on the elastic clamp causes the elastic clamp to move upward away from the adjusting sleeve. After the elastic clamp moves away from the adjusting sleeve, the elastic clamp releases the needle wire accordingly. The wire pressing mechanism maintains the tension of the electrode wire until the needle wire leaves the workpiece or stops after the needle wire abuts against the limit plate.

[0050] The connector is positioned below the limiting plate, changing the traditional wire feeding and unfeeding positions. The wire feeding and unfeeding states of the connector are completed by the coiling drum, the connecting part, and the wire pressing mechanism. Compared with the traditional wire feeding method of fixing the electrode wire to the screw on the coiling drum and the traditional wire unfeeding method of removing the electrode wire from the screw on the coiling drum, the operation method has changed, reducing manual intervention and making it more convenient to use.

[0051] Preferably, the end of the elastic clamp 361 away from the connecting rod 362 has a guide surface 369, and the guide surface 369 is inclined outward toward the connecting rod 362. The guide surface 369 makes it easier for the elastic clamp 361 to pass through the pressure block 368 during automatic wire unwinding.

[0052] Furthermore, the wire pressing mechanism 5 includes a wire feeder 51 and a first wire pressing assembly 52.

[0053] The first wire pressing assembly 52 includes an adjusting cylinder 521 mounted on the upper wire frame 51; a first adjusting rod 522 is connected to the telescopic rod of the adjusting cylinder 521, and the first adjusting rod 522 is parallel to the telescopic rod of the adjusting cylinder 521; a first adjusting block 523 is connected to one end of the first adjusting rod 522 near the adjusting cylinder 521, and a second adjusting block 524 is connected to one end of the first adjusting rod 522 away from the adjusting cylinder 521; a second adjusting rod 525 is connected between the first adjusting block 523 and the second adjusting block 524, and the first adjusting rod 522 and the second adjusting rod 525 are arranged parallel to each other; a third adjusting block 526 is arranged between the first adjusting block 523 and the second adjusting block 524, and the third adjusting block 526 has a first through hole that slides with the first adjusting rod 522 and a second through hole that slides with the second adjusting rod 525; a first adjusting spring 527 is arranged between the third adjusting block 526 and the first adjusting block 523, and the first adjusting spring 527 is sleeved on the first adjusting rod 522. The electrode wire 4 passes between the second adjusting block 524 and the third adjusting block 526.

[0054] The tension of the electrode wire 4 is adjusted by driving the second adjusting block 524 and the third adjusting block 526 through the adjusting cylinder 521, making installation more convenient and the cutting effect better. When the telescopic rod of the adjusting cylinder 521 extends outward to tension the electrode wire 4, the first adjusting spring 527 can prevent the electrode wire from breaking due to excessive tension. The second adjusting rod 525 not only provides guidance for the third adjusting block 526, but also prevents the third adjusting block 526 from rotating circumferentially on the first adjusting rod 522, making the whole system more stable.

[0055] like Figure 5 As shown, the first adjusting spring 527 is sleeved on the first adjusting rod 522. In other embodiments, the first adjusting spring may also be sleeved on the second adjusting rod, or the first adjusting spring may be sleeved on both the first adjusting rod and the second adjusting rod.

[0056] Both the first adjusting block 523 and the second adjusting block 524 are connected to the power supply and are energized to provide electro-corrosion when the electrode wire 4 cuts the workpiece. In addition to adjusting the tension of the electrode wire 4, the second adjusting block 524 and the third adjusting block 526 can also be used to conduct electricity to the electrode wire 4. This intelligent automatic wire-threading CNC wire cutting machine does not require additional conductive parts to conduct electricity to the electrode wire. Under the premise of adjusting the tension of the electrode wire, it effectively reduces production costs.

[0057] The upper wire frame 51 is provided with a guide groove 527 that cooperates with the first adjusting block 523. When the telescopic rod of the adjusting cylinder 521 extends or retracts, it is not easy to deviate, and the whole is more stable.

[0058] Furthermore, the wire pressing mechanism 5 also includes a second wire pressing assembly 53.

[0059] The second wire pressing assembly 53 includes an adjusting motor 531 mounted on the upper wire frame 51. A third adjusting rod 532 and a fourth adjusting rod 533 are connected to the rotating shaft of the adjusting motor 531. The third adjusting rod 532 and the fourth adjusting rod 533 are arranged parallel to each other and perpendicular to the rotating shaft of the adjusting motor 531. A fixing block 534 is connected to one end of the third adjusting rod 532 away from the rotating shaft of the adjusting motor 531. A fourth adjusting block 535 is arranged between the rotating shaft of the adjusting motor 531 and the fixing block 534. The fourth adjusting block 535 has a third through hole that slides with the third adjusting rod 532 and a fourth through hole that slides with the fourth adjusting rod 533. A first tensioning wheel 536 corresponding to the electrode wire 4 is rotatably connected to the fourth adjusting block 535. A second adjusting spring 537 is arranged between the fourth adjusting block 535 and the rotating shaft of the adjusting motor 531. The second adjusting spring 537 is sleeved on the third adjusting rod 532.

[0060] The fixing block 534 is used to prevent the fourth adjusting block 535 from dislodging from the third adjusting rod 532.

[0061] By adjusting the motor 531 to drive the first tensioning wheel 536, the first tensioning wheel 536 can be used to press / release the electrode wire 4. Unlike the first wire pressing assembly, the first tensioning wheel 536 is driven by adjusting the rotation of the motor 531, so that the tensioning path of the first tensioning wheel 536 on the electrode wire 4 is arc-shaped, avoiding the concentration of force on a certain point of the electrode wire 4. With the second adjusting spring 537, the electrode wire 4 is less likely to break when the second wire pressing assembly 53 adjusts the tension of the electrode wire 4.

[0062] like Figure 6 As shown, the second adjusting spring 537 is sleeved on the third adjusting rod 532. In other embodiments, the second adjusting spring may also be sleeved on the fourth adjusting rod, or the second adjusting spring may be sleeved on both the third and fourth adjusting rods.

[0063] Preferably, the electrode wire 4 is continuously pressed and tensioned by the third adjusting block 526 and the first tensioning wheel 536. The tensioning direction of the electrode wire 4 by the third adjusting block 526 is opposite to the tensioning direction of the electrode wire 4 by the first tensioning wheel 536. In the figure, the tensioning direction of the electrode wire 4 by the third adjusting block 526 is downward, and the tensioning direction of the electrode wire 4 by the first tensioning wheel 536 is upward.

[0064] There are two first wire pressing assemblies 52 or two second wire pressing assemblies 53, wherein: when there are two first wire pressing assemblies 52, the second wire pressing assembly 53 is located between the two first wire pressing assemblies; when there are two second wire pressing assemblies 53, the first wire pressing assembly 52 is located between the two second wire pressing assemblies.

[0065] The whole structure can form a W-shaped tension on the electrode wire 4 passing through the wire pressing mechanism 5, so that the third adjusting block 526 can always maintain contact with the electrode wire 4 during wire feeding. On the one hand, it can improve the tension, and on the other hand, it can make the third adjusting block 526 conduct electricity better with the electrode wire 4.

[0066] Preferably, a second tensioning wheel 538 is rotatably connected to the shaft of the adjusting motor 531, and the second tensioning wheel 538 is located on the same plane as the first tensioning wheel 536. When the first tensioning wheel is not needed for purposes such as installing electrode wires, the second tensioning wheel can be used as a reference point or as a tension critical point, thus improving functionality.

[0067] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An intelligent automatic wire cutting CNC machine tool, characterized in that, The machine tool includes a wire coiling spool, a wire pressing mechanism, and a wire threading mechanism. The wire threading mechanism includes a wire feeder mounted on a machine tool. From top to bottom, the wire feeder is provided with a limit plate, a wire clamping chuck, and a limit frame. A water nozzle facing the limit frame passes through the limit plate. A first moving device is mounted on the wire feeder. The moving part of the first moving device is connected to the wire clamping chuck. The first moving device is used to drive the wire clamping chuck to move back and forth between the limit plate and the limit frame. A connector is provided on the limit frame. The connector is connected to the coiling drum through a connecting part. The coiling drum drives the connector to wind onto the coiling drum through the connecting part. The wire threading mechanism also includes a tubular needle wire that can be sleeved and fixed on the electrode wire. The width of the needle wire is greater than the width of the opening on the water nozzle facing the limiting frame, and the length of the needle wire is less than the distance from the limiting plate to the connector. The wire clamping chuck has a clamping state for clamping the lead wire and a loosening state for releasing the lead wire; The connector has a wire-clamping state and a wire-removing state. Electrode wires are wound on the coiled wire spool; one end of the electrode wire is fixed on the coiled wire spool, and the other end of the electrode wire passes through the wire pressing mechanism and the water nozzle on the limiting plate in sequence before being threaded onto the needle wire. The direction in which the electrode wire passes through the water nozzle is from the side of the limiting plate away from the limiting frame. The wire tensioning mechanism is used to tension the electrode wire; in, The connector includes an elastic clamp and a connecting rod connected to one end of the elastic clamp; the outer surface of the connection between the connecting rod and the elastic clamp is an adjusting surface, and the adjusting surface is inclined outward toward the elastic clamp; an adjusting sleeve is slidably sleeved on the outer side of the connecting rod; the connecting rod has a first sliding state on the adjusting sleeve that clamps the elastic clamp, and a second sliding state that disengages the elastic clamp from the adjusting sleeve; the end of the connecting rod away from the elastic clamp is connected to the connecting part, and the end of the elastic clamp away from the connecting rod has a clamping opening corresponding to the lead wire; The limit frame has an elastic clamping assembly, which includes an elastic element and a pressure block connected to the elastic element. The pressure block is used to radially clamp the adjusting sleeve. The limiting frame also has a stop for limiting the movement of the elastic clamping cylinder toward the limiting plate. When the elastic clamping cylinder is blocked and limited by the stop, the connecting rod is in a second sliding state on the adjusting sleeve. The needle wire keeps the portion of the electrode wire clamped by the wire-clamping chuck in a straight line. The coiling drum is externally connected to a drive device, which is used to drive the coiling drum; the wire clamping movement chuck adopts an electromagnetic clamp.

2. The intelligent automatic wire-threading CNC wire cutting machine tool according to claim 1, characterized in that, The usage steps include: The electrode wire is fed into the coil. One end of the electrode wire is fixed on the coiling drum and wound up. The other end of the electrode wire passes through the wire pressing mechanism and the water nozzle on the limiting plate in sequence and then passes through the needle wire. The needle wire is then moved to the connector and the connector is put into the wire receiving state. Finally, the connector is wound onto the coiling drum by the connecting part and the external driving device on the coiling drum. The electrode wire, the needle wire, the connector, the connecting part and the coiling drum form a closed loop of wire feeding. Automatic wire withdrawal: The drive device moves the wire coiling drum to the limit frame and puts the wire withdrawal device in the wire withdrawal state. Then, the wire pressing mechanism tensions the electrode wire, so that the lead wire is pulled up relative to the limit frame. Automatic threading and clamping chuck clamp the needle thread. The first moving device drives the clamping chuck to move towards the limit frame so that the needle thread moves to the connector. Then the connector is put into the thread receiving state. Finally, the coiling spool drives the connector to wind onto the coiling spool through the connecting part.

3. The intelligent automatic wire-threading CNC wire cutting machine tool according to claim 2, characterized in that, After the wire feeding step is completed, the drive device moves the wire coiling drum to perform a wire feeding test and / or the drive device moves the wire coiling drum to cut the workpiece. In this process, before the drive unit moves the wire coiling drum to cut the workpiece, the guide wire first passes through the workpiece or through the hole on the workpiece before moving to the connector.

4. The intelligent automatic wire cutting CNC wire cutting machine tool according to claim 2, characterized in that, Before the automatic wire threading step, the workpiece is placed, the workpiece is changed, or the processing position of the workpiece is changed.

5. The intelligent automatic wire-threading CNC wire cutting machine tool according to claim 1, characterized in that, The end of the elastic clamp away from the connecting rod has a guide surface, and the guide surface is inclined outward toward the connecting rod.

6. The intelligent automatic wire cutting CNC wire cutting machine tool according to any one of claims 1-5, characterized in that, The wire pressing mechanism includes a first wire pressing assembly and a wire feeder mounted on a machine tool; The first wire pressing assembly includes an adjusting cylinder mounted on the upper wire frame; a first adjusting rod is connected to the telescopic rod of the adjusting cylinder, and the first adjusting rod is parallel to the telescopic rod of the adjusting cylinder; a first adjusting block is connected to one end of the first adjusting rod near the adjusting cylinder, and a second adjusting block is connected to one end of the first adjusting rod away from the adjusting cylinder; a second adjusting rod is connected between the first adjusting block and the second adjusting block, and the first adjusting rod and the second adjusting rod are arranged parallel to each other; a third adjusting block is arranged between the first adjusting block and the second adjusting block, and the third adjusting block has a first through hole that slides with the first adjusting rod and a second through hole that slides with the second adjusting rod; a first adjusting spring is arranged between the third adjusting block and the first adjusting block, and the first adjusting spring is sleeved on the first adjusting rod; The electrode wire passes between the second and third adjusting blocks; Both the first and second adjusting blocks are connected to a power source and energized to provide electro-erosion when the electrode wire cuts the workpiece. The upper wire frame is provided with a guide groove that cooperates with the first adjusting block.

7. The intelligent automatic wire-threading CNC wire cutting machine tool according to claim 6, characterized in that, The wire pressing mechanism also includes a second wire pressing assembly; The second wire pressing assembly includes an adjusting motor mounted on the upper wire frame. A third adjusting rod and a fourth adjusting rod are connected to the rotating shaft of the adjusting motor. The third adjusting rod and the fourth adjusting rod are arranged parallel to each other and perpendicular to the rotating shaft of the adjusting motor. A fixing block is connected to the end of the third adjusting rod away from the rotating shaft of the adjusting motor. A fourth adjusting block is arranged between the rotating shaft of the adjusting motor and the fixing block. The fourth adjusting block has a third through hole that slides with the third adjusting rod and a fourth through hole that slides with the fourth adjusting rod. A first tensioning wheel corresponding to the electrode wire is rotatably connected to the fourth adjusting block. A second adjusting spring is arranged between the fourth adjusting block and the rotating shaft of the adjusting motor, and the second adjusting spring is sleeved on the third adjusting rod.

8. The intelligent automatic wire-threading CNC wire cutting machine tool according to claim 7, characterized in that, The electrode wire is continuously pressed and tensioned by the third adjusting block and the first tensioning wheel. The tensioning direction of the electrode wire by the third adjusting block is opposite to the tensioning direction of the electrode wire by the first tensioning wheel. There are two first wire pressing assemblies or two second wire pressing assemblies, with the second wire pressing assembly located between the two first wire pressing assemblies or the first wire pressing assembly located between the two second wire pressing assemblies.

9. The intelligent automatic wire-threading CNC wire cutting machine tool according to claim 1, 2, 3, 4, 5, 7, or 8, characterized in that, The coiled wire spool is equipped with a storage groove, which is used to store one, two, or all of the electrode wire, connector, and wiring device.

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