Wire shearing method of wire cutting equipment

Abstract

The invention discloses a wire cutting method of wire cutting equipment, which comprises the following steps of: 1, entering a wire cutting procedure after automatic wire threading reaches a preset number of times, and cutting an electrode wire with a preset length; step 2, if the running frequency of the wire shearing program does not reach the preset frequency, directly entering step 3; if the wire shearing program runs for a preset number of times, the wire cylinder firstly moves and resets to a preset position to achieve automatic wire threading, and then the step 3 is executed; and step 3, carrying out cyclic operation of automatic wire threading, automatic cutting and automatic wire dismounting, and returning to the step after the automatic wire threading reaches a preset number of times again. According to the automatic wire threading device, the wire shearing procedure is carried out after automatic wire threading reaches preset times, when the wire shearing procedure reaches the preset times, the wire cylinder can reset to the position where automatic wire threading can be carried out, operation is repeated, manual wire threading does not need to be carried out again after wire threading every time, and the machining efficiency is remarkably improved.

Description

Technical Field

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

[0002] CNC wire cutting is a branch of EDM, which uses electrode wire (molybdenum wire, copper wire, galvanized wire) to cut the workpiece by spark discharge. In CNC wire cutting, the relative movement of the workpiece and the electrode wire is controlled by digital information. It is often used to process high-hardness materials, fine structures, complex shapes, high-precision dimensional parts, and high-surface quality parts.

[0003] CNC wire cutting machines are usually divided into three categories: fast wire cutting machines, medium wire cutting machines and slow wire cutting machines; taking fast wire cutting machines as an example, the electrode wire makes high-speed reciprocating motion, and the wire speed is 8m / s~10m / s. Its working principle is: the electrode wire passes through the pre-drilled small hole on the workpiece, and moves back and forth alternately through the guide wheel driven by the wire drum. The workpiece is installed on the conductive workbench through the insulating plate. The conductive workbench moves in the horizontal plane X and Y coordinate directions according to the given control program to synthesize any plane curve trajectory. The pulse power supply applies a pulse voltage to the electrode wire and the workpiece, the electrode wire is connected to the negative pole of the pulse power supply, and the workpiece is connected to the positive pole of the pulse power supply. When an electric pulse comes, a spark discharge is generated between the electrode wire and the workpiece. The temperature in the center of the discharge channel can instantly reach more than 10,000°C. The high temperature melts the metal of the workpiece, and even a small amount of it is vaporized. The high temperature also vaporizes part of the working fluid between the electrode wire and the workpiece. These vaporized working fluids and metal vapors expand rapidly and have explosive characteristics. This thermal expansion and local micro-explosion will throw out the melted and vaporized metal materials to achieve electro-erosion cutting of the workpiece material.

[0004] The invention patent application with application number CN202410032537.X discloses a method for automatic wire connection, threading and wire removal of wire cutting equipment, which realizes automatic wire connection, automatic threading and automatic wire removal. However, since repeated threading requires repeated clamping of the electrode wire, the electrode wire in the front section is prone to splitting or wear, affecting the success rate of automatic threading and the cutting effect. At this time, the electrode wire in the front section needs to be cut off, and the remaining electrode wire can continue to be used. In the prior art, manual intervention is often required to manually cut off the damaged electrode wire, manually thread the wire, reposition it, and set the length before the cyclic operation of automatic threading, automatic wire removal and automatic cutting can be realized again. The operation is very cumbersome, time-consuming and labor-intensive. Summary of the invention

[0005] The main purpose of the present invention is to provide a wire cutting method for a wire cutting device, so as to achieve high-efficiency wire cutting operation and improve processing efficiency.

[0006] To achieve the above-mentioned purpose, the present invention provides a wire cutting method for a wire cutting device, which is used for an automatic wire cutting device, wherein the automatic wire cutting device comprises a wire drum, a clamping and feeding mechanism, an upper wire threading mechanism and a lower wire threading mechanism, wherein a processing station is arranged between the upper wire threading mechanism and the lower wire threading mechanism, the wire drum is provided with a clamping assembly for clamping the movable end of the electrode wire, the wire drum can retract and release the electrode wire, the clamping and feeding mechanism can clamp and feed the electrode wire forward or backward, and the automatic wire cutting device can automatically thread, remove and cut the wire, and comprises the following steps:

[0007] Step 1: After the automatic wire threading reaches the preset number of times, the wire cutting program is entered to cut the electrode wire of the preset length;

[0008] Step 2: If the wire cutting program has not been run for a preset number of times, directly proceed to step 3; if the wire cutting program has been run for a preset number of times, the wire drum is first moved and reset to a preset position to achieve automatic wire threading, and then proceed to step 3;

[0009] Step 3: Enter the cycle of automatic wire threading, automatic cutting and automatic wire removal. After the automatic wire threading reaches the preset number of times again, return to step 1.

[0010] Furthermore, when the wire drum is moved and reset to a preset position in step 2, the movable end of the electrode wire can be delivered to the wire clamping position of the clamping assembly to realize automatic wire threading.

[0011] Preferably, the wire drum is reset manually or automatically.

[0012] Preferably, in step 1, the wire cutting program is automatically entered through a control program setting, or the wire cutting program is entered through manual intervention control.

[0013] Furthermore, in step 1, after cutting off the electrode wire of a preset length, the movable end of the remaining electrode wire is straightened before entering step 2.

[0014] Furthermore, in step 1, the wires are cut and straightened by an automatic wire cutting mechanism, or are cut and straightened manually.

[0015] Furthermore, the automatic wire cutting device includes a wire storage amount dynamic adjustment mechanism, and includes the following steps before step 1:

[0016] S1, cutting off a section of electrode wire so that when the wire drum rotates from the first preset position to the second preset position, the electrode wire of the preset length is released, and the initial length setting is completed;

[0017] S2. Place the product to be processed on the processing station. Under the joint action of the clamping mechanism and the wire drum, the electrode wire is clamped and fed forward. Through the forward / reverse rotation of the clamping mechanism, the dynamic adjustment mechanism of the wire storage amount is provided with a preset wire storage amount. Then, the electrode wire is clamped and fed forward so that the active end of the electrode wire reaches the preset sensing position, and the length is precisely determined.

[0018] S3. When the wire drum rotates to the second preset position, it stops rotating, the clamping assembly on the wire drum opens, and the dynamic adjustment mechanism of the wire storage amount releases part of the wire storage amount. Under the clamping and feeding of the clamping and feeding mechanism, the movable end of the electrode wire is delivered to the clamping part of the clamping assembly, and the clamping assembly clamps and fixes the movable end of the electrode wire to complete automatic wire threading, and enters the cycle operation of automatic wire threading, automatic cutting and automatic wire removal.

[0019] Furthermore, in step S1, the wire drum starts to rotate from the first preset position to release the electrode wire, and the movable end of the electrode wire passes through the dynamic wire storage amount adjustment mechanism, the upper wire threading mechanism, the processing station, and the lower wire threading mechanism in sequence, and is clamped forward by the clamping and feeding mechanism. The wire drum stops rotating when it rotates to the second preset position, and the preset wire storage amount is provided on the dynamic wire storage amount adjustment mechanism through the forward / reverse rotation of the clamping and feeding mechanism, and then the electrode wire exceeding the preset length is cut off to complete the initial wire threading and fixed length, and then the electrode wire is clamped backward to be returned to the upper wire threading mechanism.

[0020] Furthermore, before step S1, when a section of the electrode wire has not been cut off, when the wire reel is transferred from the first preset position to the second preset position, the actual length of the electrode wire released is greater than the preset length; in step S1, after the electrode wire is cut, the actual length of the electrode wire released when the wire reel is transferred from the first preset position to the second preset position is L1, the preset length for automatic wire connection is L2, and the preset wire storage length of the dynamic wire storage adjustment mechanism is L3, then L2-L3<L1≤L2.

[0021] Furthermore, a sensing unit is provided at one end of the wire threading mechanism close to the wire drum. In step S2, when the movable end of the electrode wire reaches a preset sensing position, the sensing unit is triggered to achieve precise length determination.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The wire cutting process will be carried out after the automatic wire threading reaches the preset number of times. When the wire cutting process reaches the preset number of times, the wire drum can be reset to the position where the wire can be threaded automatically. The operation is cyclical in this way, and there is no need to manually thread the wire again after each wire cutting, which significantly improves the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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 the structures shown in these drawings without paying creative work.

[0025] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the transfer tube in Example 1 of the present invention when it acts on the elastic clip;

[0027] Figure 3 for Figure 2 Enlarged schematic diagram of local a;

[0028] Figure 4 This is a working principle diagram of the wire storage amount dynamic adjustment mechanism in Example 1 of the present invention;

[0029] Figure 5 This is a structural principle diagram of the clamping and conveying mechanism in Example 1 of the present invention;

[0030] Explanation of the accompanying drawings: 100-electrode wire; 1-wire drum; 2-dynamic adjustment mechanism for wire storage amount; 3-upper wire threading mechanism; 4-lower wire threading mechanism; 5-processing station; 6-first docking mechanism; 7-second docking mechanism; 8-elastic clip; 9-receiving tube; 10-mounting plate; 11-first guide wheel; 12-second guide wheel; 13-longitudinal rack; 14-transverse rack; 15-gear; 16-clamping mechanism; 17-cylinder; 18-first sensor; 19-second sensor; 20-first counterweight; 21-second counterweight; 22-driving motor; 23-driving shaft; 24-driving gear; 25-driving pinch wheel; 26-driven shaft; 27-driven gear; 28-driven pinch wheel; 29-translational driving mechanism. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] Example 1: Reference Figures 1 to 5The present invention provides a wire cutting method for a wire cutting device, which is used for an automatic wire cutting device. The automatic wire cutting device includes a wire drum 1, a wire storage amount dynamic adjustment mechanism 2, a clamping mechanism 16, an upper wire threading mechanism 3 and a lower wire threading mechanism 4. A processing station 5 is arranged between the upper wire threading mechanism 3 and the lower wire threading mechanism 4. The upper wire threading mechanism 3 is provided with a first docking mechanism 6 that can be lifted and lowered. The first docking mechanism 6 can be lowered to the top surface of the product to be processed and docked with the processing hole position of the product to be processed. The lower wire threading mechanism 4 is provided with a second docking mechanism 7 that can be lifted and lowered. After the product to be processed is placed on the processing station 5, the second docking mechanism 7 can be raised to the bottom surface of the product to be processed and docked with the processing hole position of the product to be processed. The outer wall of the wire drum 1 is provided with a clamping component for fixing the movable end of the electrode wire 100. In this embodiment, the clamping component is a sheet-shaped elastic clip 8, one end of which is fixed to the outer wall of the wire drum 1, and the other end is extended along the outer wall of the wire drum 1. The tip of the movable end of the clamp 8 is extended outward to be provided with a guide end, and the cross-section of the guide end and the outer wall of the wire drum 1 is at an acute angle. The lower wire threading mechanism 4 is provided with a transfer tube 9 that can be moved horizontally at one end close to the wire drum 1, and the lower wire threading mechanism 4 is provided with a sensing unit for sensing the position of the movable end of the electrode wire 100 at one end close to the wire drum 1. When the sensing operation is required, the sensing unit is first placed at a preset sensing position on the wire threading path of the electrode wire 100, and then the electrode wire 100 is clamped forward. When the movable end of the electrode wire 100 touches the sensing unit, it means that the movable end of the electrode wire 100 has reached the preset sensing position, and the distance from the preset sensing position to the clamping assembly is known. In this way, the length of the electrode wire 100 that needs to be clamped forward can be known, so that the movable end of the electrode wire 100 can enter the clamping position of the elastic clamp 8 and the outer wall of the wire drum 1. The axial width of the wire drum 1 at the clamping position is the clamping position, and the clamping of the movable end of the electrode wire can be achieved within this axial width range.

[0035] Specifically, the dynamic wire storage amount adjustment mechanism 2 is used to obtain the difference between the winding and unwinding speed of the wire reel 1 and the actual speed at which the electrode wire 100 is clamped by the clamping mechanism 16, and adjust the speed of the wire reel 1 and / or the clamping mechanism 16 so that the reserve of the electrode wire 100 on the dynamic wire storage amount adjustment mechanism 2 is maintained within a preset range; the dynamic wire storage amount adjustment mechanism 2 is arranged on the electrode wire 100 passing path between the wire reel 1 and the clamping mechanism 16, and when there is a difference between the winding and unwinding speed of the wire reel 1 and the actual speed at which the electrode wire 100 is clamped by the clamping mechanism 16, the reserve of the electrode wire 100 on the dynamic wire storage amount adjustment mechanism 2 changes accordingly.

[0036] Specifically, the wire storage amount dynamic adjustment mechanism 2 includes a mounting plate 10, a first guide wheel 11, a second guide wheel 12, a sensing device and a gravity drive mechanism, the gravity drive mechanism includes a longitudinal rack 13, a transverse rack 14, a gear 15, a counterweight and a cylinder 17, the longitudinal rack 13 is perpendicular to the horizontal plane and is arranged on the mounting plate 10, the mounting plate 10 is provided with a longitudinal slide groove corresponding to the longitudinal rack 13, the longitudinal rack 13 can slide longitudinally on the longitudinal slide groove, the transverse rack 14 is parallel to the horizontal plane and is arranged on the mounting plate 10, the mounting plate 10 is provided with a transverse slide groove corresponding to the transverse rack 14, the transverse rack 14 can slide transversely on the transverse slide groove, the gear 15 is hinged on the mounting plate 10, and the counterweight acts on the longitudinal rack 13 to make The longitudinal rack 13 slides downward under gravity, and the longitudinal rack 13 is connected to the transverse rack through the gear 15 and drives the transverse rack 14 to slide transversely. Specifically, the left side of the longitudinal rack 13 is meshed with the gear 15, and the upper side of the transverse rack 14 is meshed with the gear 15. When the longitudinal rack 13 slides downward, the gear 15 rotates clockwise, thereby driving the transverse rack 14 to slide to the left. The first guide wheel 11 is hinged to one side of the mounting plate 10, and the second guide wheel 12 is hinged to the end of the transverse rack 14 away from the first guide wheel 11. The electrode wire 100 is unwound from the wire drum 1, passes through the wire storage amount dynamic adjustment mechanism 2, the upper wire threading mechanism 3, and the lower wire threading mechanism 4 in sequence, and finally returns to the wire drum 1 for winding. A clamping mechanism 16 is provided on the wire threading path to clamp and feed the electrode wire 100.

[0037] More specifically, the sensing device includes a first sensor 18 and a second sensor 19. When the winding and unwinding speed of the wire drum 1 is greater than the actual speed at which the electrode wire 100 is clamped by the clamping mechanism 16, the second guide wheel 12 will move to the left and trigger the first sensor 18, and the reserve of the electrode wire 100 on the dynamic wire storage amount adjustment mechanism 2 will decrease. At this time, the control system will reduce the speed of the wire drum 1 or increase the speed of the clamping mechanism 16 to keep the reserve of the electrode wire 100 on the dynamic wire storage amount adjustment mechanism 2 within a preset range; when the winding and unwinding speed of the wire drum 1 is less than the actual speed at which the electrode wire 100 is clamped by the clamping mechanism 16, the second guide wheel 12 will move to the right and trigger the second sensor 19, and the reserve of the electrode wire 100 on the dynamic wire storage amount adjustment mechanism 2 will increase. At this time, the control system will increase the speed of the wire drum 1 or reduce the speed of the clamping mechanism 16 to keep the reserve of the electrode wire 100 on the dynamic wire storage amount adjustment mechanism 2 within a preset range.

[0038] The counterweight block includes a first counterweight block 20 and a second counterweight block 21. The first counterweight block 20 is fixed to the upper end of the longitudinal rack 13, and the second counterweight block 21 is fixed to the end of the piston rod of the cylinder 17. The cylinder barrel of the cylinder 17 is fixed to the mounting plate 10. When the piston rod of the cylinder 17 contracts, the second counterweight block 21 is naturally placed above the first counterweight block 20. The first counterweight block 20 and the second counterweight block 21 act on the longitudinal rack 13 together to make it slide downward; when the piston rod of the cylinder 17 extends, the second counterweight block 21 is separated from the first counterweight block 20, and the first counterweight block 20 acts on the longitudinal rack 13 alone to make it slide downward. When the first counterweight block 20 acts on the longitudinal rack 13 alone, it provides a smaller force to the electrode wire 100, which is suitable for operation in the initial wire threading and wire connecting states. When the first counterweight block 20 and the second counterweight block 21 act on the longitudinal rack 13 together, they provide a larger force to the electrode wire 100, which is suitable for operation in the wire cutting state.

[0039] The pinching mechanism 16 includes a wheel assembly mounting seat, a driving wheel assembly, a driven wheel assembly and a driving motor 22. The driving wheel assembly includes a driving shaft 23, a driving gear 24 and a driving pinching wheel 25. The driving shaft 23 is hinged on the wheel assembly mounting seat. The driving gear 24 and the driving pinching wheel 25 are coaxially arranged on the driving shaft 23. The driven wheel assembly includes a driven shaft 26, a driven gear 27 and a driven pinching wheel 28. The driven gear 27 and the driven pinching wheel 28 are coaxially arranged on the driven shaft 26. One end of the driving shaft 23 is connected to the output shaft of the driving motor 22. The driven shaft 26 is connected to a translation driving mechanism 29. The translation drive mechanism 29 can drive the driven wheel group to translate so that the driving gear 24 is engaged or disengaged with the driving gear 24. When the driving gear 24 is engaged with the driven gear 27, the driving motor 22 drives the driving shaft 23 to rotate, thereby driving the driving gear 24 to rotate. At this time, the driven gear 27 rotates synchronously in the opposite direction, thereby driving the driving pinch wheel 25 and the driven pinch wheel 28 to rotate synchronously in the opposite direction. The electrode wire 100 is clamped between the driving pinch wheel 25 and the driven pinch wheel 28. When the driving pinch wheel 25 and the driven pinch wheel 28 rotate synchronously in the opposite direction, the electrode wire 100 is clamped forward or backward.

[0040] The automatic wire connecting, threading and removing method comprises the following steps:

[0041] S1. Fix one end of the electrode wire 100 on the end of the wire drum 1 away from the clamping assembly, and the wire drum 1 rotates so that the electrode wire 100 is wound around the outer wall of the wire drum 1. At the same time, the wire drum 1 gradually translates so that the electrode wire 100 is wound toward the end close to the clamping assembly until the wire drum 1 reaches the second preset position, and the wire drum 1 stops rotating and translating to complete the wire loading of the wire drum 1; then, the wire drum 1 is rotated and unwound. At this time, the piston rod of the cylinder 17 extends to lift the second counterweight block 21, and the first counterweight block 20 acts on the longitudinal rack 13 alone to provide a smaller force to the electrode wire 100. The movable end of the electrode wire 100 is first wound around the dynamic adjustment mechanism 2 for the amount of wire storage, and then passes through the upper wire threading mechanism 3 and the lower wire threading mechanism 4 in turn, and is clamped forward under the clamping of the clamping mechanism 16 and the rotational unwinding action of the wire drum 1. The wire drum 1 stops rotating when it rotates to the first preset position, and the forward / reverse rotation of the clamping mechanism 16 allows the amount of wire storage to be dynamically adjusted The mechanism 2 is provided with a preset wire storage amount, and then the electrode wire 100 exceeding the preset length is cut off, the initial manual wire threading and fixed length are completed, and the electrode wire 100 is clamped and sent backward to be returned to the upper wire threading mechanism 3; specifically, before step S1, when the electrode wire 100 is not cut off for a section, when the wire drum 1 is transferred from the first preset position to the second preset position, the actual length of the electrode wire 100 released is greater than the preset length. In step S1, assuming that after the electrode wire 100 is cut, the actual length of the electrode wire 100 released by the wire drum 1 from the first preset position to the second preset position is L1, the preset length that can be automatically connected is L2, and the preset wire storage length of the wire storage amount dynamic adjustment mechanism 2 is L3, then L2-L3<L1≤L2, which gives a certain error space. As long as the error does not exceed the preset wire storage amount of the wire storage amount dynamic adjustment mechanism 2, it can be compensated by releasing the wire storage amount of the wire storage amount dynamic adjustment mechanism 2, thereby improving the feasibility of the operation;

[0042] S2, placing the product to be processed on the processing station 5, the first docking mechanism 6 descends to the top surface of the product to be processed and docks with the processing hole of the product to be processed, the second docking mechanism 7 rises to the bottom surface of the product to be processed and docks with the processing hole of the product to be processed, forming a through wire threading channel to realize automatic wire threading, and under the joint action of the clamping mechanism 16 and the wire drum 1, the electrode wire 100 is clamped and fed forward until the wire drum 1 stops rotating when it rotates to the second preset position, and the preset wire storage amount is provided on the dynamic adjustment mechanism 2 for wire storage amount through the forward / reverse rotation of the clamping mechanism 16, and then part of the wire storage amount of the dynamic adjustment mechanism 2 for wire storage amount is released and the electrode wire 100 is clamped and fed forward at the same time, so that the movable end of the electrode wire 100 reaches the preset position, triggering the sensing unit to achieve precise length setting;

[0043] S3, the receiving tube 9 is translated to act on the elastic clip 8 of the wire drum 1 to make it open. After the movable end of the electrode wire 100 reaches the clamping position of the elastic clip 8 and the outer wall of the wire drum 1, the wire drum 1 rotates to separate the elastic clip 8 from the receiving tube 9, and the elastic clip 8 returns to the clamping state to clamp the movable end of the electrode wire 100. The receiving tube 9 is translated to reset, and the wire drum 1 continues to rotate so that the electrode wire 100 is wound on the wire drum 1 until it does not fall off, completing the automatic wire threading;

[0044] S4. The piston rod of the cylinder 17 contracts so that the second counterweight 21 is naturally placed above the first counterweight 20. The first counterweight 20 and the second counterweight 21 act on the longitudinal rack 13 together, providing a large force to the electrode wire 100, and performing automatic wire cutting processing. After receiving the processing completion signal, the wire drum 1 rotates to a position close to the first preset position (it needs to rotate several more times from the first preset position), and the piston rod of the cylinder 17 extends to lift the second counterweight 21. The first counterweight 20 acts on the longitudinal rack 13 alone, providing a small force to the electrode wire 100. Then the wire drum 1 slowly rotates to the first preset position and stops rotating. The clamping mechanism 16 clamps the electrode wire 100 backward so that the movable end of the electrode wire 100 is disengaged from the elastic clip 8. Under the action of the wire drum 1 and the clamping mechanism 16, the movable end of the electrode wire 100 is retracted into the upper wire threading mechanism 3 to complete the automatic wire removal.

[0045] The automatic wire cutting method comprises the following steps:

[0046] Step 1: After the automatic wire threading reaches a preset number of times, the wire cutting program is entered to cut the electrode wire 100 of a preset length;

[0047] Step 2: If the wire cutting program has not been run for a preset number of times, directly proceed to step 3; if the wire cutting program has been run for a preset number of times, the wire drum 1 is first moved and reset to a preset position to achieve automatic wire threading, and then proceed to step 3;

[0048] Step 3: Enter the cycle of automatic wire threading, automatic cutting and automatic wire removal. After the automatic wire threading reaches the preset number of times again, return to step 1.

[0049] When the wire drum 1 is moved and reset to the preset position in the above step 2, the movable end of the electrode wire 100 can be delivered to the wire clamping position of the clamping assembly to realize automatic wire threading. The present embodiment adopts an elastic clip 8 as a clamping component, and the clamping part of the elastic clip 8 and the outer wall of the wire drum 1 can be used as a wire clamping position. The axial width of the wire drum 1 corresponding to the clamping part can cover a number of turns of the electrode wire 100 (the electrode wire 100 is wound around the outer wall of the wire drum 1 in circles). For example, the clamping part covers ten turns of the electrode wire 100, and the length of the electrode wire 100 released by each wire cutting program is three turns. Then, the wire cutting can be repeated up to three times and then the wire drum 1 can be reset. In this case, the wire drum 1 can be manually reset, that is, it can be reset by rotating and moving along the screw rod. At this time, the electrode wire 100 needs to be removed from the equipment and fixed on the wire drum 1. After the wire drum 1 is reset, the wire is manually threaded. Compared with the situation in the prior art where the wire needs to be manually threaded every time the wire is cut, this solution reduces the frequency of manual intervention and significantly improves the processing efficiency. Of course, it is also possible to perform automatic translational resetting without rotating the wire drum 1. In this case, the preset number of times the wire cutting program is run can be set to one or more times, and no manual intervention is required throughout the process until the electrode wire 100 is insufficient in length due to multiple wire cuttings or the electrode wire 100 is damaged due to multiple cuttings, then manual intervention is required. This solution achieves a high degree of automation and significantly improves processing efficiency.

[0050] In this embodiment, in the above step 1, the wire cutting program is automatically entered through the control program setting, or the wire cutting program is entered through manual intervention control. Under normal conditions, it can be automatically operated by the control program, and under special circumstances, it can also be controlled by manual intervention, which is convenient for various working conditions; in the above step 1, after cutting off the electrode wire 100 of a preset length, the active end of the remaining electrode wire 100 is straightened before entering step 2. The wire can be cut and straightened by an automatic wire cutting mechanism, or by manual wire cutting and straightening.

[0051] By adopting this solution, the wire cutting program is carried out after the automatic wire threading reaches a preset number of times. When the wire cutting program reaches the preset number of times, the wire reel 1 can be reset to a position where the wire can be automatically threaded. The operation is cyclically performed in this way. There is no need to manually thread the wire, reposition, and determine the length after each wire cutting. The frequency of manual intervention is reduced, the automation level of the equipment is improved, and the processing efficiency is significantly improved.

[0052] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A wire cutting method for a wire cutting device, used for an automatic wire cutting device, the automatic wire cutting device comprises a wire drum, a clamping mechanism, an upper wire threading mechanism and a lower wire threading mechanism, a processing station is arranged between the upper wire threading mechanism and the lower wire threading mechanism, the wire drum is provided with a clamping assembly for clamping the movable end of the electrode wire, the wire drum can retract and release the electrode wire, the clamping mechanism can clamp and feed the electrode wire forward or backward, the automatic wire cutting device can automatically thread, remove and cut the wire, and is characterized in that: The following steps are involved: Step 1: After the automatic wire threading reaches the preset number of times, the wire cutting program is entered to cut the electrode wire of the preset length; Step 2: If the wire cutting program has not run for the preset number of times, go directly to step 3; If the wire cutting program runs for a preset number of times, the wire drum is first moved and reset to a preset position to achieve automatic wire threading, and then enters step 3; Step 3: Enter the cycle of automatic wire threading, automatic cutting and automatic wire removal. After the automatic wire threading reaches the preset number of times again, return to step 1.

2. A wire cutting method of a wire cutting device according to claim 1, characterized in that: When the wire drum is moved and reset to the preset position in step 2, the movable end of the electrode wire can be delivered to the wire clamping position of the clamping assembly to realize automatic wire threading.

3. A wire cutting method of a wire cutting device according to claim 1, characterized in that: The wire drum is reset manually or automatically.

4. A wire cutting method for a wire cutting device according to claim 1, characterized in that: In step 1, the wire cutting program is automatically entered through the control program setting, or the wire cutting program is entered through manual intervention control.

5. The wire cutting method of a wire cutting device according to claim 1, characterized in that: In step 1, after cutting off the electrode wire of a preset length, the movable end of the remaining electrode wire is straightened before proceeding to step 2.

6. A wire cutting method for a wire cutting device according to claim 5, characterized in that: In step 1, the wire is cut and straightened by an automatic wire cutting mechanism, or is cut and straightened manually.

7. A wire cutting method for a wire cutting device according to any one of claims 1 to 6, characterized in that: The automatic wire cutting device includes a wire storage amount dynamic adjustment mechanism, and includes the following steps before step 1: S1, cutting off a section of electrode wire so that when the wire drum rotates from the first preset position to the second preset position, the electrode wire of the preset length is released, and the initial length setting is completed; S2. Place the product to be processed on the processing station. Under the joint action of the clamping mechanism and the wire drum, the electrode wire is clamped and fed forward. Through the forward / reverse rotation of the clamping mechanism, the dynamic adjustment mechanism of the wire storage amount is provided with a preset wire storage amount. Then, the electrode wire is clamped and fed forward so that the active end of the electrode wire reaches the preset sensing position, and the length is precisely determined. S3. When the wire drum rotates to the second preset position, it stops rotating, the clamping assembly on the wire drum opens, and the dynamic adjustment mechanism of the wire storage amount releases part of the wire storage amount. Under the clamping and feeding of the clamping and feeding mechanism, the movable end of the electrode wire is delivered to the clamping part of the clamping assembly, and the clamping assembly clamps and fixes the movable end of the electrode wire to complete automatic wire threading, and enters the cycle operation of automatic wire threading, automatic cutting and automatic wire removal.

8. A wire cutting method for a wire cutting device according to claim 7, characterized in that: In step S1, the wire drum starts to rotate from the first preset position to release the electrode wire, and the movable end of the electrode wire passes through the dynamic wire storage amount adjustment mechanism, the upper wire threading mechanism, the processing station, and the lower wire threading mechanism in sequence, and is clamped and conveyed forward by the clamping mechanism. The wire drum stops rotating when it rotates to the second preset position, and the preset wire storage amount is obtained on the dynamic wire storage amount adjustment mechanism through the forward / reverse rotation of the clamping mechanism, and then the electrode wire exceeding the preset length is cut off to complete the initial wire threading and fixed length, and then the electrode wire is clamped and conveyed backward to return it to the upper wire threading mechanism.

9. A wire cutting method for a wire cutting device according to claim 7, characterized in that: Before step S1, when a section of the electrode wire has not been cut off, when the wire drum is transferred from the first preset position to the second preset position, the actual length of the electrode wire released is greater than the preset length; In step S1, after the electrode wire is cut, the actual length of the electrode wire released when the wire reel rotates from the first preset position to the second preset position is L1, the preset length that can achieve automatic wire connection is L2, and the preset wire storage length of the dynamic wire storage adjustment mechanism is L3, then L2-L3<L1≤L2.

10. A wire cutting method for a wire cutting device according to claim 7, characterized in that: An induction unit is provided at one end of the lower wire threading mechanism close to the wire drum. In step S2, when the movable end of the electrode wire reaches a preset induction position, the induction unit is triggered to achieve accurate length determination.

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