Metal wire straightening system and electric heating multiple cycle stretching method

Abstract

A metal wire straightening system and an electric heating multiple cycle stretching method belong to the field of metal wire stretching technology. The present invention is aimed at the problem that the straightness of the existing metal wire straightening is uncontrollable and the surface quality of the metal wire is damaged. It includes a stretching device, wherein the metal wire coil support part is used to place the metal wire coil; the metal wire stretching clamping part is arranged on the stretching slide, and the stretching slide is driven by a driving motor to displace the metal wire stretching clamping part; the metal wire stretching clamping part is between the metal wire coil support part and the metal wire end clamping part, and the end of the metal wire coil is fixedly connected with the metal wire end clamping part through the metal wire stretching clamping part, and the metal wire stretching clamping part is used to fix the metal wire at the corresponding position; the horizontal height of the wire unwinding tangent of the metal wire coil is the same as the metal wire fixing height of the metal wire stretching clamping part and the metal wire end clamping part, and the pulled-out metal wire is parallel to the stretching slide. The present invention is used for straightening metal wire.

Description

Technical Field

[0001] The invention relates to a metal wire straightening system and an electric heating multiple cycle stretching method, belonging to the technical field of metal wire stretching. Background Art

[0002] Since the 20th century, brain-computer interface technology using flexible neural electrodes as implants has developed rapidly. Due to their low stiffness, flexible electrodes are prone to buckling failure during implantation. In order to solve this problem, a microneedle-assisted guidance method was used for implantation. This method uses a microneedle structure to implant the flexible electrode into the brain tissue as a whole. After implantation into the designated location of the brain area, the microneedle retracts and leaves the flexible electrode in the tissue to reduce trauma. The guide microneedle is usually made of a metal wire with a diameter of less than 40μm. The thickness of the adult cerebral cortex usually does not exceed 2.5mm, and the length of the smallest neuron cell is about 5μm. To ensure that the positioning error of the electrode implantation is less than the length of the neuron cell, the straightness of the microneedle should be less than 2μm / 1000μm.

[0003] However, commercially available micrometer-scale wires are usually sold in coils. Due to residual stress and plastic deformation, the wires are not straight and cannot meet the straightness requirements. They need to be straightened before use. The existing methods for straightening wires include mechanical tension straightening, mechanical cold rolling or hot rolling straightening, and drawing and rolling combined straightening.

[0004] Mechanical tension straightening uses simple unidirectional stretching to straighten the wire. This method is time-consuming and has low controllability. Mechanical hot and cold rolling straightening is to bend the wire under the pressure of the straightening roller, causing plastic bending deformation. When the straightening force is eliminated and the tungsten wire recovers elastically, part of the original curvature is eliminated, and the remaining curvature is the original curvature of the next straightening roller. After multiple straightening rollers, the remaining curvature gradually decreases, and the plate tends to be straight. The surface quality of the wire obtained by this method is poor. Drawing and rolling combined straightening is to apply tension while repeatedly bending the wire on a small diameter roller to cause elastic-plastic extension, thereby straightening the wire. This method has low precision, the straightness after stretching is uncontrollable, and the applicable wire diameter is at the millimeter level. Summary of the invention

[0005] In view of the problems that the straightness of the existing metal wire straightening is uncontrollable and the surface quality of the metal wire is damaged, the present invention provides a metal wire straightening system and an electric heating multiple cycle stretching method.

[0006] A metal wire straightening system of the present invention comprises a stretching device,

[0007] The stretching device includes a metal wire coil support part, a metal wire stretching clamping part, a metal wire end clamping part, a stretching slideway and a driving motor.

[0008] The metal wire coil support portion is used to place the metal wire coil;

[0009] The wire stretching clamping part is arranged on the stretching slide, and the stretching slide is driven by a driving motor to cause the wire stretching clamping part to be displaced; the wire stretching clamping part is located between the wire coil supporting part and the wire end clamping part, and the end of the wire coil is fixedly connected with the wire end clamping part through the wire stretching clamping part, and the wire stretching clamping part is used to fix the wire in the corresponding position; the horizontal height of the wire pay-off tangent of the wire coil is the same as the wire fixing height of the wire stretching clamping part and the wire end clamping part, and the pulled-out wire is parallel to the stretching slide.

[0010] According to the wire straightening system of the present invention, the wire coil support part includes a base, a z-axis support plate, a z-axis sub-millimeter coarse positioning block and a support shaft.

[0011] The z-axis support plate is fixed on the base, and the z-axis submillimeter coarse positioning block is slidably connected to the z-axis support plate; the z-axis submillimeter coarse positioning block has a horizontal support shaft for placing the metal wire coil; the horizontal support shaft has two baffles for fixing the axial ends of the metal wire coil; a fixing nut is provided on the outer side of the outer baffle on the horizontal support shaft.

[0012] According to the wire straightening system of the present invention, the stretching slideway includes a slide rail and a slider, the slider is arranged on the slide rail, and the slide rail is driven by a driving motor to move the slider along the slide rail.

[0013] According to the wire straightening system of the present invention, the wire stretching clamping part comprises a support with a dovetail groove, a replaceable dovetail connecting block and a clamping bolt.

[0014] The bottom of the support with a dovetail groove is fixed on the slider, the replaceable dovetail connecting block is detachably connected to the support, the replaceable dovetail connecting block and the support with the dovetail groove are pressed and fixed by the screws of the clamping bolts, and two nuts are arranged on the screws for fixing the metal wire.

[0015] According to the wire straightening system of the present invention, the wire end clamping part comprises a sensor support seat, a wire clamp support frame, a replaceable wire clamp connecting block and a wire clamp.

[0016] A force sensor is arranged on the sensor support seat, the top end of the sensor support seat is connected to the wire clamp support frame in the horizontal direction, the connection end of the wire clamp support frame has a dovetail groove, the wire clamp support frame is detachably connected to the replaceable wire clamp connection block through the dovetail groove, and the upper surface of the replaceable wire clamp connection block is connected to the wire clamp;

[0017] The integral body formed by the replaceable dovetail connection block and the clamping bolt and the integral body formed by the replaceable wire clamp connection block and the wire clamp can be replaced with each other and connected to a support with a dovetail groove or a wire clamp support frame.

[0018] According to the wire straightening system of the present invention, the wire clamp includes a wire end fixing screw and two wire end fixing nuts. The wire end fixing screw is arranged on the replaceable wire clamp connecting block, and the replaceable wire clamp connecting block is pressed and fixed to the wire clamp support frame. Two wire end fixing nuts are arranged on the wire end fixing screw for fixing the wire wire.

[0019] The wire straightening system according to the present invention further comprises an inert gas chamber, wherein the inert gas chamber has a table top, and the base, the slide rail and the sensor support seat are fixed on the table top.

[0020] According to the metal wire straightening system of the present invention, the metal wire is a tungsten wire.

[0021] The present invention also provides an electric heating multiple cycle stretching method based on a metal wire straightening system, which is implemented based on the metal wire straightening system.

[0022] Connect the screws of the clamping bolt and the wire end fixing screws of the wire clamp to the positive and negative poles of the DC power supply respectively;

[0023] First, the drive motor is controlled to rotate forward, so that the wire stretching clamping part moves in a direction away from the wire end clamping part, stretching the wire, and when the reading of the force sensor reaches the upper limit of the tension threshold, the drive motor is controlled to stop for a preset time, and then the drive motor is controlled to reverse, so that the wire stretching clamping part moves in a direction close to the wire end clamping part, releasing the wire, and when the reading of the force sensor reaches the lower limit of the tension threshold, the drive motor is controlled to stop for a preset time, completing one stretching;

[0024] The driving motor is repeatedly controlled to rotate forward until a preset number of stretching cycles are completed to achieve straightening of the metal wire.

[0025] According to the electric heating multiple cycle stretching method based on the metal wire straightening system of the present invention, the inert gas chamber is filled with argon gas;

[0026] The voltage of the DC power supply is 7.5-8.5V; or the DC power supply is a constant current source, and the current is 0.38-0.42A.

[0027] Beneficial effects of the invention: The invention provides a wire straightening system, which can realize repeated stretching of the clamped wire by controlling the position of the wire stretching clamping part. Based on this, the wire is stretched and straightened for multiple cycles by direct current heating to obtain a micron-level wire straightening result.

[0028] By controlling the tension, voltage / current, and number of tensile loading and unloading cycles during the straightening process, a metal wire with a straightness less than 2μm / 1000μm can be obtained.

[0029] The invention can realize heating and straightening of tungsten wire with a diameter less than 40 μm, optimize the straightness of the metal wire, and optimize the surface quality of the straightened tungsten wire. The multiple cycle stretching method of the invention can achieve a higher precision of the straightness of the tungsten wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the metal wire straightening system of the present invention;

[0031] Figure 2 is a schematic diagram of the structure of a metal wire coil support portion;

[0032] Figure 3 It is a structural schematic diagram of a wire stretching clamping portion;

[0033] Figure 4 It is a schematic diagram of the structure of the clamping portion at the end of the metal wire;

[0034] Figure 5 It is a structural schematic diagram of the stretch slide;

[0035] Figure 6 It is a comparison diagram before and after tungsten wire stretching using the system and stretching method of the present invention;

[0036] Figure 7 The following are scanning electron microscope comparisons of a tungsten wire with a diameter of 35 μm before straightening, after straightening in air using the structure of the present invention, and after straightening in argon. (a) is the tungsten wire before straightening, (b) is the tungsten wire after straightening in air, and (c) is the tungsten wire after straightening in argon.

[0037] Figure 8 for Figure 7 AFM image of the tungsten wire surface corresponding to (a); in the figure, x is the length of the tungsten wire, and y is the microscopic roughness of the tungsten wire surface;

[0038] Fig. 9 for Figure 7 (b) The corresponding AFM image of the tungsten wire surface;

[0039] Fig.10 for Figure 7 (c) The corresponding AFM image of the tungsten wire surface;

[0040] Fig.11 For Figure 7 SEM images of tungsten wire cross sections corresponding to (a), (b), and (c). DETAILED DESCRIPTION

[0041] 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.

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0043] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0044] Specific implementation method 1. Combination Figures 1 to 5 As shown, the present invention provides a wire straightening system, comprising a stretching device,

[0045] The stretching device includes a metal wire coil support portion 100, a metal wire stretching clamping portion 200, a metal wire end clamping portion 300, a stretching slideway 400 and a driving motor 500.

[0046] The metal wire coil support portion 100 is used to place the metal wire coil;

[0047] The wire stretching clamping part 200 is arranged on the stretching slide 400, and the stretching slide 400 is driven by the driving motor 500 to cause the wire stretching clamping part 200 to be displaced; the wire stretching clamping part 200 is located between the wire coil support part 100 and the wire end clamping part 300, and the end of the wire coil is fixedly connected with the wire end clamping part 300 through the wire stretching clamping part 200, and the wire stretching clamping part 200 is used to fix the wire at the corresponding position; the horizontal height of the wire unwinding tangent of the wire coil is the same as the wire fixing height of the wire stretching clamping part 200 and the wire end clamping part 300, and the pulled-out wire is parallel to the stretching slide 400.

[0048] Further, combined with Figure 2 As shown, the metal wire coil support part 100 includes a base 110, a z-axis support plate 120, a z-axis sub-millimeter coarse positioning block 130 and a support shaft 140.

[0049] The z-axis support plate 120 is fixed on the base 110, and the z-axis submillimeter coarse positioning block 130 is slidably connected to the z-axis support plate 120; the z-axis submillimeter coarse positioning block 130 has a horizontal support shaft 140 for placing the metal wire coil; the horizontal support shaft 140 has two baffles 141 for fixing the axial ends of the metal wire coil; a fixing nut is provided on the outer side of the outer baffle 141 on the horizontal support shaft 140.

[0050] Combination Figure 5 As shown, the stretching slide 400 includes a slide rail 410 and a slider 420 . The slider 420 is disposed on the slide rail 410 . The slide rail 410 is driven by a driving motor 500 to move the slider 420 along the slide rail 410 .

[0051] The slide rail 410 can be connected to the drive motor 500 through a coupling.

[0052] Combination Figure 3 As shown, the wire tension clamping part 200 includes a support 210 with a dovetail groove, a replaceable dovetail connection block 220 and a clamping bolt 230.

[0053] The bottom of the support 210 with a dovetail groove is fixed on the slider 420, and the replaceable dovetail connecting block 220 is detachably connected to the support 210. The replaceable dovetail connecting block 220 and the support 210 with a dovetail groove are tightened and fixed by the screw of the clamping bolt 230, and two nuts are set on the screw for fixing the metal wire.

[0054] Combination Figure 4 As shown, the wire end clamping portion 300 includes a sensor support seat 310, a wire clamp support frame 320, a replaceable wire clamp connection block 330 and a wire clamp 340.

[0055] A force sensor is arranged on the sensor support seat 310, and the top end of the sensor support seat 310 is connected to the wire clamp support frame 320 in the horizontal direction. The connection end of the wire clamp support frame 320 has a dovetail groove, and the wire clamp support frame 320 is detachably connected to the replaceable wire clamp connection block 330 through the dovetail groove. The upper surface of the replaceable wire clamp connection block 330 is connected to the wire clamp 340;

[0056] The whole formed by the replaceable dovetail connection block 220 and the clamping bolt 230 and the whole formed by the replaceable wire clamp connection block 330 and the wire clamp 340 can be interchangeably connected to the support 210 with the dovetail groove or the wire clamp support frame 320.

[0057] The purpose of making the whole formed by the replaceable dovetail connection block 220 and the clamping bolt 230 and the whole formed by the replaceable wire clamp connection block 330 and the wire clamp 340 interchangeable is to complete the straightening operation once before the next straightening operation. That is, after the metal wire is cut off after the previous straightening, since the metal wire clamped by the current clamping bolt 230 becomes the end of the current wire coil, it is removed and directly connected to the wire clamp support frame 320, which can simplify the operation steps. At this time, the whole formed by the replaceable wire clamp connection block 330 and the wire clamp 340 is connected to the support 210 with the dovetail groove, and then the corresponding wire is clamped to start the next stretching. Thereby, the operation of loosening the nut and winding the tungsten wire can be reduced once.

[0058] The screw of the clamping bolt 230 and the wire end fixing screw of the wire clamp 340 are used to connect the positive electrode and the negative electrode of the DC power supply respectively to realize direct electrical heating of the metal wire.

[0059] The wire clamp 340 includes a wire end fixing screw and two wire end fixing nuts. The wire end fixing screw is arranged on the replaceable wire clamp connection block 330 and presses and fixes the replaceable wire clamp connection block 330 and the wire clamp support frame 320. Two wire end fixing nuts are arranged on the wire end fixing screw for fixing the metal wire.

[0060] Going a step further, combined Figure 1 As shown, an inert gas chamber 600 is also included. The inert gas chamber 600 has a table surface, and the base 110, the slide rail 410 and the sensor support seat 310 are fixed on the table surface.

[0061] The inert gas chamber 600 can be an acrylic sealed box, with an openable and closable operation window on the front side, and inert gas inlet and outlet holes on the right side and the top. The inert gas chamber provides an argon atmosphere for straightening the metal wire, which can avoid oxidation of the metal wire surface caused by heating.

[0062] As an example, the metal wire is a tungsten wire.

[0063] In the device of the present invention, the metal wire coil support part is used for clamping the metal wire reel and fixing the metal wire, which can effectively fix the rolled metal wire on the device, and is convenient for continuous replacement of the metal wire and improve efficiency; the force sensor arranged at the clamping part at the end of the metal wire can be used to monitor the tension during the straightening process of the metal wire, and feed back to the control module of the metal wire stretching clamping part, so as to realize the real-time transmission of the tension; the control module is used to control the motor to move the metal wire stretching clamping part, so as to realize the cyclic stretching of the metal wire; the DC power supply directly applies current to the metal wire, so as to heat the metal wire to a certain temperature and remove residual stress; the inert gas chamber is used to provide an inert gas environment for straightening the metal wire, so as to improve the influence of the oxide layer generated by heating during the straightening process on the surface quality.

[0064] Specific implementation method 2: Combination Figures 1 to 5 As shown, the present invention also provides an electric heating multiple cycle stretching method based on a metal wire straightening system, which is implemented based on the metal wire straightening system described in the specific implementation mode 1.

[0065] Connect the screw of the clamping bolt 230 and the wire end fixing screw of the wire clamp 340 to the positive and negative electrodes of the DC power supply respectively; set the DC power supply to a constant voltage value to energize and heat the metal wire;

[0066] First, the driving motor 500 is controlled to rotate forward, so that the wire stretching clamping part 200 moves in a direction away from the wire end clamping part 300, and the wire is stretched. At this time, the reading of the force sensor will gradually increase. When the reading of the force sensor reaches the upper limit of the tension threshold, the driving motor 500 is controlled to stop for a preset time, and then the driving motor 500 is controlled to reverse, so that the wire stretching clamping part 200 moves in a direction close to the wire end clamping part 300, and the wire is released. At this time, the reading of the force sensor will gradually decrease. When the reading of the force sensor reaches the lower limit of the tension threshold, the driving motor 500 is controlled to stop for a preset time, and one stretching is completed;

[0067] The driving motor 500 is repeatedly controlled to rotate forward until a preset number of stretching cycles are completed to achieve straightening of the metal wire.

[0068] Further, the inert gas chamber 600 is filled with argon gas;

[0069] The voltage of the DC power supply is 7.5-8.5V; or the DC power supply is a constant current source, and the current is 0.38-0.42A.

[0070] The direct electric heating and multiple-cycle stretching method is an important means to achieve small-scale, high-straightness metal wire straightening. The straightened tungsten wire is used for microneedle-assisted implantation of flexible neural electrodes for brain-computer interfaces. It can enhance the stiffness of the flexible electrode, reduce the friction between the electrode and the biological tissue during the implantation process, and minimize tissue trauma and positioning errors during deep implantation.

[0071] It has been experimentally verified that by using the method of the present invention to directly electrically heat and stretch a tungsten wire with a diameter less than 40 μm for multiple cycles, combined with multiple loading and unloading cycles, and precise control of the tension, voltage, and number of cycles during the straightening process, a tungsten wire with a straightness of less than 2 μm / 1000 μm can be obtained.

[0072] The specific operation process of the method of the present invention is:

[0073] 1. Initialize the system, put the stretching device into the inert gas chamber, put the tungsten wire coil on the horizontal support shaft 140, and fix the baffle 141. Fix the outer baffle by fixing the nut to prevent the tungsten wire coil from axial displacement;

[0074] 2. Remove the replaceable wire clamp connection block 330, pull out the tungsten wire of the tungsten wire coil and clamp it with the wire clamp 340, and then fix the replaceable wire clamp connection block 330 on the wire clamp support frame 320;

[0075] 3. Fix the replaceable dovetail connection block 220 on the support 210 with the dovetail groove by screws; wrap the tungsten wire at the corresponding position around the screw of the clamping bolt 230 clockwise and clamp it, rotate the tungsten wire coil to straighten the tungsten wire, and fix the pre-straightened tungsten wire segment between the clamping bolt 230 and the wire clamp 340;

[0076] 4. Insert the positive and negative alligator clips of the DC regulated power supply into the inert gas chamber and clamp them on the corresponding screws;

[0077] 5. Close the inert gas chamber, open the gas pipeline, and introduce argon into the inert gas chamber. After 30 seconds, close the gas pipeline. At this time, the inert gas chamber is filled with argon;

[0078] 6. Turn on the DC regulated power supply, adjust the voltage to 8V, and heat the tungsten wire;

[0079] 7. Connect the host PC to the serial port of the stepper motor via a USB data cable, open the LabVIEW software program, select the serial port and open it, and set the maximum and minimum values ​​of the force sensor reading when straightening the tungsten wire;

[0080] 8. Start the program, clear the sensor reading, control the motor to rotate, first make the tungsten wire start to stretch, the sensor reading gradually increases, and is displayed in real time in the waveform diagram of the program;

[0081] 9. When the sensor reading reaches the maximum value, the motor will pause for 4 seconds under the control of the program, and then reversely rotate, reducing the tension inside the tungsten wire; when the sensor reading is less than the minimum threshold, the motor will pause for 4 seconds under the control of the program, and then automatically reversely rotate to stretch the tungsten wire and increase the tension inside the tungsten wire. Each time it increases to the maximum threshold and then decreases to the minimum threshold, the program count increases by 1, completing a cycle, and after the predetermined number of cycles, the stretching is completed;

[0082] 10. Finally, control the motor to rotate so that the internal tension of the tungsten wire is about 0.2N, control the motor to stop running, terminate the program, open the inert gas chamber, cut off both ends of the tungsten wire to obtain the straightened tungsten wire, turn off the DC regulated power supply, remove the positive and negative alligator clips, and the tungsten wire can be straightened.

[0083] Embodiment: The method of the present invention is used to straighten tungsten wire. When the maximum value of the force sensor reading is 1.6N, the minimum value is 0.6N, the DC regulated power supply voltage is 8.25V, and the number of cycles is 12, the effective straightening of tungsten wire with a diameter of 35μm is achieved, and the minimum straightness after straightening can reach about 1 / 1000μm. Figure 6 shown. Figure 7 The figure shows that by adopting the method of the present invention to straighten the tungsten wire in argon, the surface quality of the metal wire is guaranteed. Figure 8 As shown, the roughness of the tungsten wire before straightening is 22.11 nm; Fig. 9 As shown, the roughness of the tungsten wire after straightening in air is 43.13nm due to surface oxidation; Fig.10 As shown in the figure, the surface roughness of the tungsten wire straightened in argon using the method of the present invention is 29.64nm. This shows that the surface roughness of the tungsten wire straightened by the method of the present invention is better than the surface roughness of the tungsten wire directly straightened in air. Fig.11 As shown, there is no oxide layer on the surface of the tungsten wire before straightening, and the oxide layer produced on the surface of the tungsten wire straightened in argon is thinner than that produced on the surface of the tungsten wire straightened in air.

[0084] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that the features described in conjunction with a single embodiment may be used in other described embodiments.

Claims

1. A wire straightening system, characterized in that Including stretching device, The stretching device comprises a metal wire coil support part (100), a metal wire stretching clamping part (200), a metal wire end clamping part (300), a stretching slideway (400) and a driving motor (500). The metal wire coil support portion (100) is used to place the metal wire coil; The metal wire stretching clamping part (200) is arranged on the stretching slideway (400), and the stretching slideway (400) is driven by a driving motor (500) to cause the metal wire stretching clamping part (200) to be displaced; the metal wire stretching clamping part (200) is located between the metal wire coil support part (100) and the metal wire end clamping part (300), and the end of the metal wire coil is fixedly connected to the metal wire end clamping part (300) through the metal wire stretching clamping part (200), and the metal wire stretching clamping part (200) is used to fix the metal wire at the corresponding position; the horizontal height of the wire unwinding tangent of the metal wire coil is the same as the metal wire fixing height of the metal wire stretching clamping part (200) and the metal wire end clamping part (300), and the drawn metal wire is parallel to the stretching slideway (400); The metal wire coil support part (100) comprises a base (110), a z-axis support plate (120), a z-axis sub-millimeter coarse positioning block (130) and a horizontal support shaft (140). The z-axis support plate (120) is fixed on the base (110), and the z-axis submillimeter coarse positioning block (130) is slidably connected to the z-axis support plate (120); the z-axis submillimeter coarse positioning block (130) has a horizontal support shaft (140) for placing the metal wire coil; the horizontal support shaft (140) has two baffles (141) for fixing the axial ends of the metal wire coil; and a fixing nut is provided on the outer side of the outer baffle (141) on the horizontal support shaft (140); The stretching slideway (400) comprises a slide rail (410) and a slider (420), wherein the slider (420) is arranged on the slide rail (410), and the slide rail (410) is driven by a driving motor (500) so that the slider (420) moves along the slide rail (410); The wire stretching clamping part (200) comprises a support (210) having a dovetail groove, a replaceable dovetail connecting block (220) and a clamping bolt (230). The bottom of the support (210) with a dovetail groove is fixed on the slider (420), the replaceable dovetail connecting block (220) is detachably connected to the support (210), and the replaceable dovetail connecting block (220) and the support (210) with a dovetail groove are pressed and fixed by the screw of the clamping bolt (230), and two nuts are arranged on the screw for fixing the metal wire.

2. The wire straightening system according to claim 1, characterized in that: The metal wire end clamping portion (300) comprises a sensor support seat (310), a wire clamp support frame (320), a replaceable wire clamp connecting block (330) and a wire clamp (340). A force sensor is arranged on the sensor support seat (310); the top end of the sensor support seat (310) is connected to a wire clamp support frame (320) in a horizontal direction; the connection end of the wire clamp support frame (320) has a dovetail groove; the wire clamp support frame (320) is detachably connected to a replaceable wire clamp connection block (330) via the dovetail groove; and the upper surface of the replaceable wire clamp connection block (330) is connected to a wire clamp (340); The integral body formed by the replaceable dovetail connection block (220) and the clamping bolt (230) and the integral body formed by the replaceable wire clamp connection block (330) and the wire clamp (340) can be interchangeably connected to the support (210) with the dovetail groove or the wire clamp support frame (320).

3. The wire straightening system according to claim 2, characterized in that: The wire clamp (340) comprises a wire end fixing screw and two wire end fixing nuts. The wire end fixing screw is arranged on the replaceable wire clamp connection block (330) and presses and fixes the replaceable wire clamp connection block (330) and the wire clamp support frame (320). The wire end fixing screw is provided with two wire end fixing nuts for fixing the metal wire.

4. The wire straightening system according to claim 3, characterized in that: It also includes an inert gas chamber (600), wherein the inert gas chamber (600) has a table top, and the base (110), the slide rail (410) and the sensor support seat (310) are fixed on the table top.

5. The wire straightening system according to claim 4, characterized in that: The metal wire is a tungsten wire.

6. An electric heating multiple cycle stretching method based on a metal wire straightening system, implemented based on the metal wire straightening system of claim 4, characterized in that: Connecting the screw of the clamping bolt (230) and the wire end fixing screw of the wire clamp (340) to the positive electrode and the negative electrode of the DC power supply respectively; First, the drive motor (500) is controlled to rotate forward, so that the metal wire stretching clamping part (200) moves in a direction away from the metal wire end clamping part (300), stretching the metal wire, and when the reading of the force sensor reaches the upper limit of the tension threshold, the drive motor (500) is controlled to stop for a preset time, and then the drive motor (500) is controlled to rotate reversely, so that the metal wire stretching clamping part (200) moves in a direction close to the metal wire end clamping part (300), releasing the metal wire, and when the reading of the force sensor reaches the lower limit of the tension threshold, the drive motor (500) is controlled to stop for a preset time, completing one stretching; The driving motor (500) is repeatedly controlled to rotate forward until a preset number of stretching cycles are completed, thereby achieving straightening of the metal wire.

7. The electric heating multiple cycle stretching method based on the metal wire straightening system according to claim 6, characterized in that: The inert gas chamber (600) is filled with argon gas; The voltage of the DC power supply is 7.5-8.5V; or the DC power supply is a constant current source, and the current is 0.38-0.42A.

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