A wire cutting machine tool

Abstract

The present invention relates to a wire cutting machine tool, including a machine tool bed, a wire feeding mechanism, a pulse power supply, a conductive unit, a coordinate worktable and a linear drag part. The conductive unit is composed of an upper conductive subunit and a lower conductive subunit. The relative height position of the lower conductive subunit is always maintained at a fixed value, and is detachably fixed to the machine tool bed. The linear drag part is used to drag the upper conductive subunit to perform displacement movement toward / opposite to a workpiece to be processed along the up and down directions, and the linear drag part is supported by the machine tool bed. By adopting the above technical solution for setting, the upper conductive subunit can be adjusted in position along the up and down directions under the action of the linear drag part to adapt to workpieces to be processed of different thicknesses, thereby ensuring that the processing current is always maintained in a stable range during the process of executing wire cutting, and finally ensuring that the wire cutting processing has high cutting efficiency and cutting quality.

Description

Technical Field

[0001] The invention relates to the technical field of wire cutting, in particular to a wire cutting machine tool. Background Art

[0002] The conductive unit of the wire cutting machine has two functions. One function is to provide a stable discharge voltage between the molybdenum wire and the workpiece, and the other function is to feed back the sampling signal to the control system. The conductive unit plays a very important role in the discharge machining process of the wire cutting machine. It connects the negative pole of the pulse power supply to a molybdenum wire (diameter 0.13-0.22mm), and the positive pole of the pulse power supply to the workpiece. The molybdenum wire is used as the negative electrode, and the workpiece is used as the positive electrode. The high-frequency pulse power supply generates a discharge voltage of 75V-110V between the positive and negative electrodes. Since the gap between the molybdenum wire and the workpiece is only 0.005mm-0.0155mm, a strong electric field is generated between the molybdenum wire and the workpiece, and the electric energy generates a huge high temperature. The metal melts under high temperature and high pressure, and the working fluid cools and flushes the molten metal in the cutting gap, thereby achieving the purpose of machining.

[0003] Theoretically, the closer the conductive unit is to the workpiece, the better it is for the discharge between the molybdenum wire and the workpiece. The discharge of the machine tool is more stable and the cutting efficiency is higher. Figure 1 , Figure 2 The schematic diagrams of the working state of the wire cutting machine tool in the prior art when processing thin and thick parts respectively show that the installation positions of the upper and lower conductive sub-units are always fixed, the distance between the lower conductive sub-unit and the workpiece is always unchanged, and the distance between the upper conductive sub-unit and the workpiece is variable, for example, Figure 1 As shown in , when cutting a thin workpiece, the distance between the upper conductive subunit and the workpiece is d1; when cutting a thick workpiece, the distance between the upper conductive subunit and the workpiece is d2; then d2<d1. According to the actual experimental results, when the workpiece thickness is large, the wire cutting machine has a higher cutting efficiency and the cutting surface forming quality is higher. However, when processing thin workpieces, the processing current of the wire cutting is extremely unstable, and the pointer of the ammeter showing the processing current size shakes up and down particularly greatly, and the cutting efficiency and cutting quality are significantly reduced. After analysis, the reason for the above problems is that the upper conductive subunit is too far away from the workpiece, which makes it difficult to ensure the stability of the voltage formed between the workpiece and the molybdenum wire, which leads to the occurrence of unstable processing current. Therefore, it is urgent for technical personnel to solve the above problems. Summary of the invention

[0004] Therefore, in view of the above-mentioned existing problems and defects, the designers of the present invention collected relevant information, conducted multiple evaluations and considerations, and continued to experiment and modify the wire cutting machine after many years of R&D experience in this industry, which ultimately led to the emergence of the wire cutting machine.

[0005] In order to solve the above technical problems, the present invention relates to a wire cutting machine tool, including a machine bed, a wire feeding mechanism, a pulse power supply, a conductive unit and a coordinate worktable. The wire feeding mechanism includes a wire storage barrel, an electrode wire, a first power unit and a guide wheel assembly. The wire storage barrel is arranged on one side of the machine bed, and alternately performs positive and reverse rotational motions under the driving force of the first power unit to achieve the storage and release of the electrode wire. The electrode wire is wound on the wire storage barrel, and vertically passes through the workpiece to be processed under the coordinated action of the guide wheel assembly. The guide wheel assembly is composed of a plurality of guide wheels that are detachably fixed to the machine bed and used to guide the direction of the electrode wire. The coordinate worktable is used to carry the workpiece to be processed to perform displacement motion along the left and right directions or / and the front and back directions, and is arranged directly below the machine bed. The positive and negative poles of the pulse power supply are electrically connected to the workpiece to be processed and the electrode wire respectively by the conductive unit. In addition, the wire cutting machine tool also includes a linear dragging unit. The conductive unit is composed of an upper conductive subunit and a lower conductive subunit. The relative height position of the lower conductive subunit is always kept at a fixed value, and is detachably fixed to the machine bed. The linear drag part is used to drag the upper conductive subunit to perform displacement movement toward / away from the workpiece to be processed along the up and down directions; the linear drag part is supported by the machine bed.

[0006] As a further improvement of the technical solution of the present invention, the linear drag part includes a drag rod, a screw rod and a rack rod motor. The screw rod is vertically inserted on the machine bed. The drag rod is arranged parallel to the screw rod, and under the driving action of the rack rod motor, the upper conductive unit is dragged to move in the up and down direction. The rack rod motor is detachably fixed to the upper free end of the drag rod.

[0007] Of course, as another modified design of the above technical solution, the linear traction part is preferably a ball screw linear module, a synchronous belt linear module or a linear motor linear module.

[0008] As a further improvement of the technical solution of the present invention, the upper conductive subunit includes a mounting base, a conductive block, an insulating sleeve, an eccentric conductive rod, a locking nut and a wire guide nozzle. The mounting base is directly driven by a linear drag part. The eccentric conductive rod is connected in sequence by a first screw segment, a connecting transition base and a second screw segment. The central axis of the first screw segment and the central axis of the second screw segment are offset from each other by a set distance d. The first screw segment is inserted into the mounting base, and correspondingly, a first threaded hole adapted to the first screw segment is provided on the mounting base. The insulating sleeve is sleeved on the first screw segment and is pressed between the mounting base and the connecting transition base. The conductive block is sleeved on the second screw segment and is limited in axial displacement by the connecting transition base. The locking nut is screwed onto the second screw segment. When the locking nut is rotated, it performs a displacement movement toward / backward of the conductive block to achieve / release the pressure on the conductive block. The wire guide nozzle is used to allow the electrode wire to pass freely. The wire guide nozzle is supported by the mounting substrate and arranged directly below the conductive block.

[0009] As a further improvement of the technical solution of the present invention, the cross section of the conductive block is preferably a regular polygon or a circle.

[0010] As a further improvement of the technical solution of the present invention, the insulating sleeve is preferably a plexiglass sleeve or a nylon sleeve.

[0011] As a further improvement of the technical solution of the present invention, the eccentric conductive rod is preferably made of a brass rod or a copper turned rod.

[0012] As a further improvement of the technical solution of the present invention, the upper conductive subunit also includes a position fine-tuning component. The position fine-tuning component includes a sliding plate, a connecting transition plate, a first locking screw, an adjusting bolt and a columnar spring. The sliding plate is used to install the wire guide nozzle, and can freely pass through the mounting base plate along the front and rear directions. A sliding guide notch that matches the shape of the sliding plate is provided on the mounting base plate. The connecting transition plate is detachably fixed to the front side wall of the sliding plate by the first locking screw. The adjusting bolt crosses the connecting transition plate, and its free end is inserted into the mounting base plate. A second threaded hole that matches the adjusting bolt is provided on the mounting base plate. The columnar spring is sleeved on the adjusting bolt, and is always elastically pressed between the connecting transition plate and the mounting base plate.

[0013] As a further improvement of the technical solution of the present invention, the position fine-tuning assembly also includes a second locking screw. The second locking screw is inserted into the mounting base plate to limit the axial displacement movement of the sliding plate. A third threaded hole is extended to the left from the right side wall of the mounting base plate, which is adapted to the second locking screw and penetrates the sliding guide notch.

[0014] As a further improvement of the technical solution of the present invention, the wire guide nozzle is detachably fixed to the sliding plate by a thread pair. An external thread pair is provided around the outer wall of the wire guide nozzle, and correspondingly, a fourth threaded hole adapted to the external thread pair extends downward from the top wall of the sliding plate.

[0015] Compared with the wire cutting machine with traditional design structure, in the technical solution disclosed in the present invention, the upper conductive sub-unit can be adjusted in the up and down direction under the action of the linear drag part to adapt to the workpieces to be processed of different thicknesses, so that the distance between the upper conductive sub-unit and the workpiece to be processed is always maintained within a reasonable value range, thereby ensuring that the processing current is always maintained within a stable range during the wire cutting process, which means that the voltage formed between the workpiece to be processed and the electrode wire has good stability, ultimately ensuring that the wire cutting process has high cutting efficiency and cutting quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the working state of the wire cutting machine tool in the prior art when processing thin parts.

[0018] Figure 2 It is a schematic diagram of the working state of the wire cutting machine tool in the prior art when processing thick parts.

[0019] Figure 3 It is a structural schematic diagram of the wire cutting machine tool in the present invention.

[0020] Figure 4 It is a structural schematic diagram of the upper conductive subunit in the wire cutting machine tool of the present invention.

[0021] Figure 5 yes Figure 4 Front view of .

[0022] Figure 6 yes Figure 4 Side view of.

[0023] Figure 7 yes Figure 4 Top view of the .

[0024] Figure 8 It is a three-dimensional schematic diagram of the installation base plate in the wire cutting machine tool of the present invention.

[0025] Fig. 9It is a three-dimensional schematic diagram of the conductive block in the wire cutting machine tool of the present invention.

[0026] Fig.10 It is a three-dimensional schematic diagram of the insulating sleeve in the wire cutting machine tool of the present invention.

[0027] Fig.11 It is a three-dimensional schematic diagram of an eccentric conductive rod in a wire cutting machine tool of the present invention.

[0028] Fig.12 It is a three-dimensional schematic diagram of a connecting transition plate in a wire cutting machine tool of the present invention.

[0029] Fig.13 It is a structural schematic diagram of a columnar spring in a wire cutting machine tool of the present invention.

[0030] 1-machine bed; 2-wire transport mechanism; 21-wire storage drum; 22-electrode wire; 23-direct drive motor; 24-guide wheel assembly; 241-guide wheel; 3-conductive unit; 31-upper conductive subunit; 311-mounting base plate; 3111-first threaded hole; 3112-sliding guide notch; 3113-second threaded hole; 3114-third threaded hole; 312-conductive block; 313-insulating sleeve; 314-eccentric conductive rod; 3141-first screw segment; 3142-conductive block; 3143-insulating sleeve; 3144-eccentric conductive rod; 3145-first screw segment; 3146-first screw segment; 3147-first screw segment; 3148-second screw segment; 3149-second screw segment; 3150-second screw segment; 3151-second screw segment; 3152-second screw block; 3153-insulating sleeve; 3154-eccentric conductive rod; 3155-first screw segment; 3156-second screw segment; 3157-second screw segment; 3158-second screw segment; 3159-second screw segment; 3160-second screw segment; 3161-second screw segment; 3162-second screw block; 3163-second screw 142-connecting transition base; 3143-second screw section; 315-locking nut; 316-wire guide nozzle; 317-position fine-tuning assembly; 3171-sliding plate; 3172-connecting transition plate; 3173-first locking screw; 3174-adjusting bolt; 3175-column spring; 3176-second locking screw; 32-lower conductive subunit; 4-coordinate workbench; 5-linear drag part; 51-drag rod; 52-screw rod; 53-rack rod motor. DETAILED DESCRIPTION

[0031] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "front", "rear", "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0032] In order to facilitate those skilled in the art to fully understand the technical solutions disclosed in the present invention, Figure 3The schematic diagram of the structure of the wire cutting machine tool in the present invention is shown. It can be seen that it is mainly composed of a machine bed 1, a wire feeding mechanism 2, a pulse power supply (not shown in the figure), a conductive unit 3, a coordinate worktable 4 and a linear drag part 5. Among them, the wire feeding mechanism 2 includes a wire storage barrel 21, an electrode wire 22, a direct drive motor 23 and a guide wheel assembly 24. The wire storage barrel 21 is arranged on one side of the machine bed 1, and alternately performs positive and reverse rotational motions under the driving force of the direct drive motor 23 to achieve the storage and release of the electrode wire 22. The electrode wire 22 is wound on the wire storage barrel 21, and vertically passes through the workpiece to be processed under the coordinated action of the guide wheel assembly 24. The guide wheel assembly 24 is composed of a plurality of guide wheels 241 that are detachably fixed to the machine bed 1 and are used to guide the direction of the electrode wire 22. The coordinate worktable 4 is used to carry the workpiece to be processed to perform displacement motion along the left and right directions or / and the front and back directions, and is arranged directly below the machine bed 1. The positive and negative electrodes of the pulse power supply are electrically connected to the workpiece to be processed and the electrode wire 22 respectively through the conductive unit 3. The conductive unit 3 is composed of an upper conductive subunit 31 and a lower conductive subunit 32. The relative height position of the lower conductive subunit 32 is always maintained at a fixed value, and is detachably fixed to the machine bed 1. The linear drag part 5 is supported by the machine bed 1. When it is started, it is used to drag the upper conductive subunit 31 to perform displacement movement along the up and down direction to move away from or approach the workpiece to be processed until a stable voltage value is formed between the workpiece to be processed and the electrode wire 22.

[0033] In the actual working process of the wire cutting machine, the upper conductive subunit 31 can be adjusted in the up and down direction under the action of the linear drag part 5 to adapt to the workpieces to be processed of different thicknesses, so that the distance between the upper conductive subunit 31 and the workpiece to be processed is always maintained within a reasonable value range, and the distance between the lower conductive subunit 32 and the workpiece to be processed is always maintained at a constant value, thereby ensuring that the processing current is always maintained in a stable range during the wire cutting process, which means that the voltage formed between the workpiece to be processed and the electrode wire 22 has good stability, ultimately ensuring that the wire cutting process has high cutting efficiency and cutting quality.

[0034] It should be noted that, in addition to the above-mentioned direct drive motor 23, other drive forms such as reduction motor, rotary motor + reduction box can also be selected according to the actual application scenario and the required output power.

[0035] It is known that the linear dragging part 5 can adopt a variety of design structures to achieve the driving of the upper conductive subunit 31, but hereby recommends an implementation scheme with a simple design structure, easy implementation, and convenient for later maintenance operations, as follows: Figure 3As shown in the figure, the linear dragging part 5 preferably includes a dragging rod 51, a screw rod 52 and a rack rod motor 53. The screw rod 52 is vertically inserted on the machine tool bed 1. The dragging rod 51 is arranged parallel to the screw rod 52, and the upper conductive unit 31 is dragged to move in the up and down direction under the driving action of the rack rod motor 53. The rack rod motor 53 is detachably fixed to the upper free end of the dragging rod 51.

[0036] Of course, more simply, the linear drag part 5 can also be replaced by a ball screw linear module, a synchronous belt linear module or a linear motor linear module, etc., which are directly purchased as finished products.

[0037] As a further refinement of the above wire cutting machine tool structure, Figure 4 , 5 As shown in FIG. 6 and FIG. 7 , the main functional element of the upper conductive subunit 31 is a conductive block 312 (eg Figure 8 As shown in ). It is known that since the electrode wire 22 always linearly contacts the outer surface of the conductive block 312, and in the actual operation of the wire cutting machine, the moving speed of the electrode wire 22 can reach up to 11 m / s, the pressure control between the electrode wire 22 and the conductive block 312 is particularly important. Specifically, if the clamping force is too large, a groove will be quickly worn out on the outer surface of the conductive block 312, which may easily cause the electrode wire 22 to be torn off due to "wire clamping"; if the clamping force is too small, the conductivity of the electrode wire 22 will inevitably deteriorate, thereby affecting the normal discharge during the cutting process. In view of this, on the basis of the conductive block 312, the upper conductive subunit 31 is additionally provided with a mounting substrate 311 (such as Figure 8 As shown in ), the insulating sleeve 313 (as Fig.10 ), eccentric conductive rod 314 (as shown in Fig.11), a locking nut 315 and a guide wire nozzle 316. Among them, the mounting base plate 311 is directly driven by the above-mentioned linear drag part 5. The eccentric conductive rod 314 is preferably made of a brass rod or a copper rod, which is connected in sequence by a first screw segment 3141, a connecting transition base 3142 and a second screw segment 3143. The central axis of the first screw segment 3141 and the central axis of the second screw segment 3143 are offset from each other by a set distance d. The first screw segment 3141 is plugged into the mounting base plate 311, and correspondingly, a first threaded hole 3111 adapted to the first screw segment 3141 is opened on the mounting base plate 311. The insulating sleeve 313 is preferably a plexiglass bushing or a nylon bushing, which is sleeved on the first screw segment 3141 and pressed between the mounting base plate 311 and the connecting transition base 3142. The conductive block 312 is sleeved on the second screw segment 3143, and the axial displacement is limited by the connecting transition base 3142. The locking nut 315 is screwed on the second screw segment 3143. When the locking nut 315 is rotated, it performs a displacement movement toward / backward from the conductive block 312 to achieve / release the pressure on the conductive block 312. The wire guide nozzle 316 is used for the electrode wire 22 to pass freely. It is supported by the mounting base plate 311 and arranged directly below the conductive block 312.

[0038] When the clamping force between the electrode wire 22 and the conductive block 312 needs to be adjusted, it is only necessary to rotate the eccentric conductive rod 314 circumferentially, and the conductive block 312 rotates accordingly. Since the eccentric conductive rod 314 itself has a certain eccentricity, this will inevitably change the pressure value applied by the conductive block 312 to the electrode wire 22. Continue to rotate the eccentric conductive rod 314 until a reasonable clamping force is maintained between the conductive block 312 and the electrode wire 22.

[0039] In addition, after a period of use, when the surface of the conductive block 312 forms deeper grooves due to repeated wear of the electrode wire 22, the operator only needs to loosen the locking nut 315 first, and then rotate the conductive block 312 circumferentially at a certain angle until its other surface is directly opposite to the electrode wire 22, and finally, re-tighten the locking nut 315, thereby doubling the utilization rate of the conductive block 312. Assuming that the cross-section of the conductive block 312 is a regular quadrilateral, it means that it has four surfaces for wear. When one of the surfaces is severely worn, the other surface is rotated to make it contact the electrode wire 22, ensuring that the electrode wire 22 has good electrical stability. By adopting the above technical solution, the replacement frequency of the conductive block 312 is greatly reduced, thereby reducing the maintenance cost of the wire cutting machine in the actual application process to a certain extent.

[0040] It should be noted that, in addition to the regular quadrilateral described above, the cross section of the conductive block 312 may also be preferably circular, that is, the conductive block 312 is cylindrical as a whole (not shown in the figure). In this way, when it is worn by the electrode wire 22, the locking nut 315 is further loosened, and the eccentric conductive rod 314 is slightly rotated along the circumferential direction to stagger the electrode wire 22 and the formed groove.

[0041] In addition, as a further optimization of the above-mentioned wire cutting machine structure, Figure 4 , 5 As shown in FIGS. 6 and 7 , the upper conductive subunit 31 is additionally provided with a position fine-tuning component 317. The position fine-tuning component 317 is mainly composed of a sliding plate 3171, a connecting transition plate 3172 (such as Fig.12 ), a first locking screw 3173, an adjusting bolt 3174, and a columnar spring 3175 (as shown in Fig.13 ) and other parts. Among them, the sliding plate 3171 is used to directly install the wire guide nozzle 316, and can freely pass through the mounting base plate 311 along the front-to-back direction. A sliding guide notch 3112 that matches the shape of the sliding plate 3171 is provided on the mounting base plate 311. The connecting transition plate 3172 is detachably fixed to the front side wall of the sliding plate 3171 by means of a first locking screw 3173. The adjusting bolt 3174 crosses the connecting transition plate 3172, and its free end is inserted into the mounting base plate 311. A second threaded hole 3113 that matches the adjusting bolt 3174 is provided on the mounting base plate 311. The columnar spring 3175 is sleeved on the adjusting bolt 3174, and is always elastically pressed between the connecting transition plate 3172 and the mounting base plate 311. In this way, when grooves are worn out on the surface of the conductive block 312, in addition to rotating the eccentric conductive rod 314 to replace the top contact surface, the operator can also use a handheld wrench to rotate the adjusting bolt 3174 circumferentially to drive the sliding plate 3171 to perform a directional displacement movement along the front-to-back direction. At the same time, the wire guide nozzle 316 also performs a displacement movement synchronously, and the electrode wire 22 is tilted and offset at a certain angle under the action of the lateral pushing force until it completely passes through the formed groove, ensuring that the electrode wire 22 always contacts the conductive block 312 without a gap, thereby ensuring that it has better electrical stability.

[0042] It is known that after the sliding plate 3171 is dragged into position relative to the mounting base plate 311 along the front-rear direction, a variety of means can be used to achieve locking of its own position. However, a scheme with a simple design structure, easy implementation, and extremely fast locking and unlocking operations is recommended here, as follows: Figure 4 , 7As shown in , the position fine-tuning assembly 317 is further provided with a second locking screw 3176. The second locking screw 3176 is inserted into the mounting base plate 311 to limit the axial displacement movement of the sliding plate 3171. A third threaded hole 3114 is extended to the left from the right side wall of the mounting base plate 311, which is adapted to the second locking screw 3176 and interpenetrates with the sliding guide notch 3112. When the relative position of the sliding plate 3171 is adjusted in advance, the operator needs to loosen the second locking screw 3176 in advance; and when the relative position of the sliding plate 3171 is adjusted in place, the operator can re-tighten the second locking screw 3176 in time to ensure that the electrode wire 22 is always maintained at a certain specific tilt angle within the expected time period.

[0043] Finally, it should be noted that the wire guide nozzle 316 is a consumable part, and it needs to be frequently replaced during the actual application of the wire cutting machine. In view of this, in order to reduce the difficulty of replacing the wire guide nozzle 316 and improve the maintainability of the wire cutting machine, as a further optimization of the structure of the upper conductive subunit 31, the wire guide nozzle 316 is preferably detachably fixed to the sliding plate 3171 by a thread pair. An external thread pair is provided around the outer wall of the wire guide nozzle 316, and correspondingly, a fourth threaded hole adapted to the external thread pair extends downward from the top wall of the sliding plate 3171.

[0044] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wire cutting machine tool, comprising a machine bed, a wire feeding mechanism, a pulse power supply, a conductive unit and a coordinate worktable; the wire feeding mechanism comprises a wire storage drum, an electrode wire, a first power unit and a guide wheel assembly; the wire storage drum is arranged on one side of the machine bed, and alternately performs positive and reverse rotational motions under the driving force of the first power unit to realize the storage and release of the electrode wire; the electrode wire is wound on the wire storage drum, and vertically passes through a workpiece to be processed under the coordinated action of the guide wheel assembly; the guide wheel assembly is composed of a plurality of guide wheels detachably fixed to the machine bed for directional correction of the electrode wire; the coordinate worktable is used to carry the workpiece to be processed to perform displacement motion along the left-right direction or / and the front-back direction, and is arranged directly below the machine bed; the positive and negative poles of the pulse power supply are electrically connected to the workpiece to be processed and the electrode wire respectively by means of the conductive unit, characterized in that, It also includes a linear dragging part; the conductive unit is composed of an upper conductive sub-unit and a lower conductive sub-unit; the relative height position of the lower conductive sub-unit is always kept at a fixed value, and is detachably fixed to the machine tool bed; the linear dragging part is used to drag the upper conductive sub-unit to perform displacement movement toward / opposite to the workpiece to be processed along the up and down direction; the linear dragging part is supported by the machine tool bed; The upper conductive subunit includes a mounting base, a conductive block, an insulating sleeve, an eccentric conductive rod, a locking nut and a wire guide nozzle; the mounting base is directly driven by the linear drag part; the eccentric conductive rod is sequentially connected by a first screw segment, a connecting transition base and a second screw segment; the central axis of the first screw segment and the central axis of the second screw segment are staggered by a set distance d; the first screw segment is plugged into the mounting base, and correspondingly, a first threaded hole adapted to the first screw segment is opened on the mounting base; the insulating sleeve The edge sleeve is sleeved on the first screw segment and is pressed between the mounting base and the connecting transition base; the conductive block is sleeved on the second screw segment and is limited in axial displacement by the connecting transition base; the locking nut is screwed on the second screw segment; when the locking nut is rotated, it performs displacement movement toward / backwards from the conductive block to achieve / release the pressure on the conductive block; the wire guide nozzle is used for allowing the electrode wire to pass freely, is supported by the mounting base, and is arranged directly below the conductive block; The upper conductive subunit also includes a position fine-tuning component; the position fine-tuning component includes a sliding plate, a connecting transition plate, a first locking screw, an adjusting bolt and a columnar spring; the sliding plate is used to install the guide wire nozzle and can freely pass through the mounting base plate along the front-back direction; a sliding guide notch adapted to the shape of the sliding plate is provided on the mounting base plate; the connecting transition plate is detachably fixed to the front side wall of the sliding plate by the first locking screw; the adjusting bolt crosses the connecting transition plate, and its free end is inserted into the mounting base plate; a second threaded hole adapted to the adjusting bolt is provided on the mounting base plate; the columnar spring is sleeved on the adjusting bolt and is always elastically pressed between the connecting transition plate and the mounting base plate; The cross section of the conductive block is a regular polygon or a circle.

2. The wire cutting machine tool according to claim 1, characterized in that: The linear dragging part includes a drag rod, a lead screw and a rack rod motor; the lead screw is vertically inserted into the machine tool bed; the drag rod is arranged parallel to the lead screw, and under the driving action of the rack rod motor, the upper conductive sub-unit is dragged to move in the up and down directions; the rack rod motor is detachably fixed to the upper free end of the drag rod.

3. The wire cutting machine tool according to claim 1, characterized in that: The linear dragging part is a ball screw linear module, a synchronous belt type linear module or a linear motor type linear module.

4. The wire cutting machine tool according to claim 1, characterized in that: The insulating sleeve is a plexiglass sleeve or a nylon sleeve.

5. The wire cutting machine tool according to claim 1, characterized in that: The eccentric conductive rod is made of a brass rod or a copper turned rod.

6. The wire cutting machine tool according to claim 1, characterized in that: The position fine-tuning assembly also includes a second locking screw; the second locking screw is inserted into the mounting base plate to limit the axial displacement movement of the sliding plate; a third threaded hole extends to the left from the right side wall of the mounting base plate, which is adapted to the second locking screw and penetrates the sliding guide notch.

7. The wire cutting machine tool according to claim 1, characterized in that: The wire guide nozzle is detachably fixed to the sliding plate by means of a thread pair; an external thread pair is provided around the outer side wall of the wire guide nozzle, and correspondingly, a fourth threaded hole adapted to the external thread pair extends downward from the top wall of the sliding plate.

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