A device and method for processing pulse current of metal strip under bidirectional tension

Abstract

The present invention provides a pulse current processing device and method for a metal strip under bidirectional tension, comprising a bidirectional tension and pulse current applying device, a real-time detection device for the plate shape of the metal strip and a supporting base; the device effectively improves the plate shape defects of the metal strip by applying tension in the rolling direction and the transverse direction, thereby realizing rapid straightening of the metal strip; at the same time, by applying pulse current in the rolling direction or the transverse direction or applying tension of different magnitudes in both directions, the stress state of the metal strip is changed; secondly, compared with conventional heat preservation heating annealing devices, the pulse current can realize efficient regulation of the mechanical properties of the metal strip and quickly eliminate internal stress; thirdly, plate shape monitoring is realized by laser ranging to ensure the consistency of the plate shape of the metal strip; finally, the manufacturing cost of the device is low, and the rolling direction tension and pulse current applying device has a simple structure, which is conducive to sealing operation and effectively reduces the operating cost.

Description

Technical Field

[0001] The invention belongs to the technical field of metal composite thin strip preparation, and in particular relates to a device and method for pulse current treatment of metal thin strips under bidirectional tension. Background Art

[0002] Metal strips are widely used in manufacturing, electronics and other industries due to their uniform thickness, superior surface quality, high hardness, good deep drawing performance and resilience. However, with the continuous development of precision, lightweight and mobility in manufacturing, electronics and other industries, higher requirements are placed on the thickness and dimensional accuracy of metal strips.

[0003] Since the strength and hardness of metal strips are improved by solid solution, aging and large deformation, residual stress is difficult to avoid in each production link; at the same time, the rolling extension of the metal strip in the roll gap during rolling is unevenly distributed along the transverse direction of the plate and strip. As a result of this uneven extension, the rolling residual stress of the strip after rolling is unevenly distributed along the transverse direction. When the residual compressive stress exceeds a certain limit, the metal strip will become unstable and buckle, resulting in reduced dimensional accuracy and plate defects such as stud lines and two-rib inclined waves, which seriously affect the appearance of the finished product and the quality of subsequent punching, etching or forming processes.

[0004] To solve the above problems, the current solution is to eliminate the residual stress in the metal strip through processes such as straightening and tension annealing, and at the same time regulate the organizational properties of the metal strip to improve the plate quality of the metal strip, eliminate plate defects, and improve the overall performance.

[0005] Existing metal strip straightening equipment mostly adopts a multi-roller arrangement, which produces tension deformation and plastic extension through the combined action of stretching and bending to achieve the straightening effect; at the same time, it is supplemented by online annealing equipment for tension annealing to remove residual stress or adjust the structure performance. However, since the tensile tension direction of the existing straightening equipment can only be applied along the rolling direction, the improvement effect on the plate shape, especially perpendicular to the rolling direction, is limited; and the precise control of the plate shape through stretching and bending deformation places high demands on the performance of the straightening equipment and the rationality of the process regulations.

[0006] From the above, it can be seen that the straightening equipment and annealing device have the disadvantages of low straightening efficiency, high requirements and high operating costs. Summary of the invention

[0007] In order to solve the shortcomings and deficiencies of the prior art, a pulse current processing device and method for a metal strip under bidirectional tension are provided, thereby solving the problems of low efficiency, low plate shape control accuracy and high cost of the existing metal strip straightening equipment and processes for metal strip straightening.

[0008] In order to achieve the purpose of the present invention, a pulse current processing device for a metal strip under the action of bidirectional tension is provided, which includes a bidirectional tension and pulse current applying device, a real-time detection device for the plate shape of the metal strip and a supporting base. The bidirectional tension and pulse current applying device is fixed to the upper surface of the supporting base to achieve simultaneous application of rolling tension, pulse current and transverse tension to the metal strip; the fixed column in the real-time detection device for the plate shape of the metal strip is fixedly connected to the upper and lower surfaces of the supporting base by bolts, and a through hole is opened in the center of the supporting base to achieve measurement of the plate shape of the metal strip by the laser ranging array in the real-time detection device for the plate shape of the metal strip, and the working area composed of the bidirectional tension and pulse current applying device, the real-time detection device for the plate shape of the metal strip and the supporting base is provided with a sealed cavity on the outside, and the sealed cavity is filled with nitrogen and helium to prevent oxidation of the metal strip in the working area.

[0009] As a further improvement of the above-mentioned scheme, the bidirectional tension and pulse current applying device includes a rolling tension and pulse current applying device and a transverse tension applying device. The rolling tension and pulse current applying device simultaneously applies rolling tension and pulse current to the metal strip, and the transverse tension applying device applies transverse tension to the metal strip. The rolling tension and pulse current applying device is combined with the transverse tension applying device to achieve rapid straightening of the metal strip.

[0010] As a further improvement of the above scheme, the rolling tension and pulse current applying device includes a symmetrically arranged rolling tension applying unit, and the rolling tension applying unit includes a ball guide pair and a C-shaped chuck frame, the lower surface of the ball guide pair is fixedly connected to the upper surface of the support base, the bottom surface of the C-shaped chuck frame cooperates with the upper surface of the ball guide pair to realize the limitation of the movement trajectory of the C-shaped chuck frame, the upper and lower arms extending from the C-shaped chuck frame form an action chamber, the upper top surface of the action chamber is connected to the fixed end of the hydraulic cylinder, the moving end of the hydraulic cylinder is connected to the center hole of the upper pressure plate by a threaded connection, so that the upper pressure plate is pushed by the hydraulic cylinder to clamp the metal strip, the back side of the C-shaped chuck frame is fixedly connected to one end of the cylindrical dynamometer, and the other end of the cylindrical dynamometer is connected to the moving end of the servo electric cylinder. The movable end is connected, and the fixed end of the servo electric cylinder is fixed in a horizontal position by a fixed bracket. The bottom surface of the fixed bracket is fixedly connected to the upper surface of the supporting base, so that the servo electric cylinder pulls the C-shaped chuck frame to apply rolling tension to the metal strip. The vertical end of the fixed bracket is provided with a long through hole to enable the passage of the metal strip. A conveying roller group is fixed on the upper surface of the horizontal end of the fixed bracket to achieve normal conveyance of the metal strip. An electrode is provided at the front end of the lower arm extending from the C-shaped chuck frame. The electrode is connected to an external power supply through a wire to achieve the application of a pulse current to the metal strip. An insulating lining is provided between the ball guide pair and the C-shaped chuck frame. An insulating joint is provided between the cylindrical dynamometer and the moving end of the servo electric cylinder to prevent the pulse current from overflowing.

[0011] As a further improvement of the above scheme, the lateral tension applying device includes a symmetrically arranged lateral tension applying unit, and the lateral tension applying unit includes a ball guide pair and a C-shaped chuck frame, the lower surface of the ball guide pair is fixedly connected to the upper surface of the support base, the bottom surface of the C-shaped chuck frame cooperates with the upper surface of the ball guide pair to realize the limitation of the movement trajectory of the C-shaped chuck frame, the bottom surface of the upper arm extending from the C-shaped chuck frame is connected to the fixed end of the hydraulic cylinder, and the moving end of the hydraulic cylinder is connected to the center hole of the upper pressure plate through a threaded connection, so as to push the upper pressure plate through the hydraulic cylinder. The plate clamps the metal strip, the back of the C-shaped chuck frame is fixedly connected to one end of the cylindrical dynamometer, the other end of the cylindrical dynamometer is connected to the moving end of the servo electric cylinder, the fixed end of the servo electric cylinder is fixed in a horizontal position by a fixed bracket, the bottom surface of the fixed bracket is fixedly connected to the upper surface of the supporting base, so that the servo electric cylinder pulls the C-shaped chuck frame to apply lateral tension to the metal strip, and the bottom surface of the upper pressure plate and the upper surface of the lower arm extending from the C-shaped chuck frame are both provided with an insulating layer to avoid affecting the pulse current flowing through the metal strip.

[0012] As a further improvement of the above-mentioned scheme, the real-time detection device for the plate shape of the metal strip includes detection units symmetrically arranged at the top and the bottom, and the detection units include a gantry-type electric high-speed slide and a laser ranging array. The movement trajectory of the gantry-type electric high-speed slide is perpendicular to the movement direction of the metal strip. The laser ranging array is fixed on the moving beam in the gantry-type electric high-speed slide and points vertically to the metal strip to realize the detection of the plate shape of the metal strip.

[0013] As a further improvement of the above solution, the bottom surface of the upper pressing plate and the upper surface of the lower arm extending from the C-shaped clamping frame are both arranged to form corrugated strip grooves to prevent the metal strip from slipping.

[0014] As a further improvement of the above solution, the contact surface between the bottom surface of the upper pressing plate and the insulating layer arranged on the upper surface of the lower arm extending from the C-shaped clamping frame is arranged to be a corrugated strip groove to prevent the metal strip from slipping.

[0015] The present invention provides a metal strip processing method using a metal strip pulse current processing device under bidirectional tension, and the specific steps are as follows:

[0016] Step 1: unwind the metal strip through the cooperation of a winder and an unwinder, and send it into the bidirectional stretching area of ​​a bidirectional tension and pulse current applying device;

[0017] Step 2: Use the hydraulic cylinders in the rolling tension and pulse current applying device and the transverse tension applying device to push the upper pressing plate to clamp the edge of the metal strip, and then use the servo electric cylinder to pull the C-shaped clamp frame to apply rolling tension and transverse tension to the metal strip;

[0018] Step 3, applying a pulse current to the metal strip using electrodes in a rolling tension and pulse current applying device, regulating the structure and toughness of the metal strip through the pulse current, and removing the residual stress of the metal strip;

[0019] Step 4: The laser ranging arrays symmetrically arranged at the upper and lower parts of the real-time detection device for the shape of the metal thin strip are used to cooperate with the gantry-type electric high-speed slide table to measure the thickness of the metal thin strip in real time, so as to realize the real-time monitoring of the shape of the metal thin strip. At the same time, the C-shaped chuck frame is pulled by the servo electric cylinder to complete the real-time adjustment of the shape of the metal thin strip.

[0020] Step five: the rolling tension and pulse current applying device and the transverse tension applying device release the clamping of the metal strip, and then the metal strip is sent out of the biaxial stretching area through the cooperation of the winder and the unwinder, and then the edge of the metal strip is removed through the punching process to obtain a metal strip with qualified performance.

[0021] As a further improvement of the above solution, in step 2, the clamped width of the metal strip does not exceed 1 / 10 of the width of the metal strip.

[0022] As a further improvement of the above scheme, in step 4, the plate shape is scanned by a laser ranging probe to obtain the local deflection ω x , ω y With thickness t , calculate the flatness Δ , compared with the expected setting value of flatness Δ 1 Flatness Δ The size of the actual flatness Δ Less than the set value Δ1 When the tension and current output are stopped, the machine is cooled under constant tension.

[0023] The beneficial effects of the present invention are:

[0024] Compared with the prior art, the device and method for pulse current treatment of metal strips under bidirectional tension provided by the present invention have the following advantages:

[0025] (1) Improved the efficiency of metal strip straightening and the accuracy of plate shape control

[0026] By applying tension in the rolling direction and transverse direction, the shape defects of the metal strip can be effectively improved, and the metal strip can be quickly straightened. At the same time, by applying pulse current in the rolling direction or transverse direction or applying tension of different magnitudes in both directions, the stress state of the metal strip can be changed, thereby regulating the anisotropy of the texture and organizational properties of the metal strip. In addition, compared with conventional heat preservation heating annealing devices, pulse current can achieve efficient regulation of the mechanical properties of the metal strip and quickly eliminate internal stress. Finally, the shape of the metal strip can be monitored by laser ranging to ensure the consistency of the shape of the metal strip.

[0027] (2) Reduce the cost of straightening metal strips

[0028] Compared with the straightening machine equipped with the conventional stretch-bending straightening process, the manufacturing cost of this device is more economical; at the same time, the rolling tension and pulse current application device has a simple structure, which is conducive to sealing operation, effectively avoiding oxidation and energy consumption caused by long-term insulation, and effectively reducing operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a three-dimensional diagram of the device of the present invention;

[0030] Figure 2 is a front view of the device of the present invention;

[0031] Figure 3It is a three-dimensional diagram of the bidirectional tension and pulse current applying device of the present invention;

[0032] Figure 4 It is a three-dimensional diagram of the rolling tension and pulse current applying device of the present invention;

[0033] Figure 5 yes Figure 4 A-direction view in the figure;

[0034] Figure 6 yes Figure 5 A partial enlarged view of point D in the middle;

[0035] Figure 7 is a stereoscopic diagram of a rolling direction tension applying unit in the present invention;

[0036] Figure 8 yes Figure 7 B view in the figure;

[0037] Fig. 9 is a perspective view of a lateral tension applying device;

[0038] Fig.10 yes Fig. 9 A partial enlarged view of point C in the middle;

[0039] Fig.11 It is a three-dimensional diagram of the real-time detection device for the shape of a metal thin strip in the present invention;

[0040] Fig.12 It is a schematic diagram of the operation of the real-time detection device for the shape of a metal strip in the present invention;

[0041] Fig.13 is a schematic diagram of the method of the present invention;

[0042] Fig.14 is a flow chart of determining parameters of the method of the present invention;

[0043] Fig.15 This is a comparison chart of tensile properties between pulse current treatment and conventional annealing treatment in the present invention;

[0044] Fig.16 It is a microstructure comparison diagram of the pulse current treatment in the present invention and the conventional annealing treatment.

[0045] Among them, 1-bidirectional tension and pulse current applying device; 2-metal strip plate shape real-time detection device; 3-support base; 4-rolling tension and pulse current applying device; 5-lateral tension applying device; 6-metal strip; 7-bidirectional stretching area; 8-servo electric cylinder; 9-fixed bracket; 11-insulating joint; 12-column dynamometer; 13-ball guide pair; 14-C-shaped chuck rack; 15-hydraulic cylinder; 16-upper pressure plate; 17-insulating lining plate; 18-transmission roller group; 19-electrode; 20-conductor wire; 21-insulating layer; 22-gantry electric high-speed slide; 23-laser ranging array; 24-sealed cavity; 25-fixed column. DETAILED DESCRIPTION

[0046] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings:

[0047] The present invention provides a pulse current processing device for a metal strip under bidirectional tension, such as Figure 1 As shown, it includes a bidirectional tension and pulse current applying device 1, a metal thin strip plate shape real-time detection device 2 and a support base 3, the bidirectional tension and pulse current applying device 1 is fixed to the upper surface of the support base 3, so as to realize the simultaneous application of rolling tension, pulse current and transverse tension to the metal thin strip 6; the fixing column 25 in the metal thin strip plate shape real-time detection device 2 is fixedly connected to the upper and lower surfaces of the support base 3 by bolts, and a through hole is opened in the center of the support base 3, so as to realize the measurement of the plate shape of the metal thin strip 6 by the laser ranging array 23 in the metal thin strip plate shape real-time detection device 2;

[0048] like Figure 2 As shown, the working area composed of the bidirectional tension and pulse current applying device 1, the metal strip plate shape real-time detection device 2 and the supporting base 3 is covered with a sealed cavity 24 outside, and the sealed cavity 24 is filled with nitrogen and helium to prevent the metal strip 6 from being oxidized in the working area.

[0049] like Figure 3 As shown, the bidirectional tension and pulse current applying device 1 includes a rolling tension and pulse current applying device 4 and a transverse tension applying device 5. The rolling tension and pulse current applying device 4 applies rolling tension and pulse current to the metal strip 6 at the same time, and the transverse tension applying device 5 applies transverse tension to the metal strip 6. The rolling tension and pulse current applying device 4 is combined with the transverse tension applying device 5 to achieve rapid straightening of the metal strip 6.

[0050] like Figures 4 to 8As shown, the rolling tension and pulse current applying device 4 includes a symmetrically arranged rolling tension applying unit, and the rolling tension applying unit includes a ball guide pair 13 and a C-shaped chuck frame 14. The lower surface of the ball guide pair 13 is fixedly connected to the upper surface of the support base 3, and the bottom surface of the C-shaped chuck frame 14 cooperates with the upper surface of the ball guide pair 13 to realize the limitation of the movement trajectory of the C-shaped chuck frame 14. The upper and lower arms extending from the C-shaped chuck frame 14 form an action chamber, and the upper top surface of the action chamber is connected to the fixed end of the hydraulic cylinder 15. The moving end of the hydraulic cylinder 15 is connected to the center hole of the upper pressure plate 16 through a threaded connection, so that the upper pressure plate 16 is pushed by the hydraulic cylinder 15 to clamp the metal strip 6. The back side of the C-shaped chuck frame 14 is fixedly connected to one end of the cylindrical dynamometer 12, and the other end of the cylindrical dynamometer 12 is connected to the moving end of the servo electric cylinder 8. The fixed end of the servo electric cylinder 8 is fixed in a horizontal position by a fixed bracket 9, and the bottom surface of the fixed bracket 9 is fixedly connected to the upper surface of the supporting base 3, so that the servo electric cylinder 8 pulls the C-shaped chuck frame 14 to apply rolling tension to the metal strip 6. A long through hole is opened at the vertical end of the fixed bracket 9 to enable the metal strip 6 to pass through, and a conveying roller group 18 is fixed on the upper surface of the horizontal end of the fixed bracket 9 to achieve normal conveyance of the metal strip 6. An electrode 19 is provided at the front end of the lower arm extending from the C-shaped chuck frame 14, and the electrode 19 is connected to an external power supply through a wire 20 to achieve the application of a pulse current to the metal strip 6. An insulating lining 17 is provided between the ball guide pair 13 and the C-shaped chuck frame 14, and an insulating joint 11 is provided between the cylindrical dynamometer 12 and the moving end of the servo electric cylinder 8 to prevent the pulse current from overflowing.

[0051] like Fig. 9 and Fig.10 As shown, the lateral tension applying device 5 includes a symmetrically arranged lateral tension applying unit, which includes a ball guide pair 13 and a C-shaped chuck frame 14. The lower surface of the ball guide pair 13 is fixedly connected to the upper surface of the support base 3. The bottom surface of the C-shaped chuck frame 14 cooperates with the upper surface of the ball guide pair 13 to limit the movement trajectory of the C-shaped chuck frame 14. The bottom surface of the upper arm extending from the C-shaped chuck frame 14 is connected to the fixed end of the hydraulic cylinder 15. The moving end of the hydraulic cylinder 15 is connected to the center hole of the upper pressure plate 16 through a threaded connection, so that the upper pressure plate 16 is pushed by the hydraulic cylinder 15 to move the metal sheet The belt 6 is clamped, the back side of the C-shaped chuck frame 14 is fixedly connected to one end of the cylindrical dynamometer 12, the other end of the cylindrical dynamometer 12 is connected to the moving end of the servo electric cylinder 8, the fixed end of the servo electric cylinder 8 is fixed in a horizontal position by a fixed bracket 9, the bottom surface of the fixed bracket 9 is fixedly connected to the upper surface of the support base 3, so that the servo electric cylinder 8 pulls the C-shaped chuck frame 14 to apply lateral tension to the metal strip 6, and the bottom surface of the upper pressure plate 16 and the upper surface of the lower arm extending from the C-shaped chuck frame 14 are both provided with an insulating layer 21 to avoid affecting the pulse current flowing through the metal strip 6.

[0052] like Fig.11 and Fig.12 As shown, the real-time detection device 2 for the plate shape of a metal strip includes detection units symmetrically arranged at the top and the bottom, and the detection units include a gantry-type electric high-speed slide 22 and a laser ranging array 23. The movement trajectory of the gantry-type electric high-speed slide 22 is perpendicular to the movement direction of the metal strip 6. The laser ranging array 23 is fixed on the moving beam in the gantry-type electric high-speed slide 22 and points vertically to the metal strip 6 to realize the detection of the plate shape of the metal strip 6.

[0053] like Fig.13 As shown, the present invention provides a method for processing a metal strip, and the specific steps are as follows:

[0054] Step 1: unwind the metal strip 6 through the cooperation of the winder and the unwinder, and send it into the biaxial stretching area 7 of the biaxial tension and pulse current applying device 1;

[0055] Step 2: Use the hydraulic cylinder 15 in the rolling tension and pulse current applying device 4 and the transverse tension applying device 5 to push the upper pressing plate 16 to clamp the edge of the metal strip 6, and the clamped width does not exceed 1 / 10 of the width of the metal strip 6. Then use the servo electric cylinder 8 to pull the C-shaped clamping head frame 14 to apply rolling tension and transverse tension to the metal strip 6.

[0056] In addition, the allowable value Δ1 of the flatness of the plate shape is determined in advance by comprehensively considering the deflection ω and the target thickness t. Since the main function of the device is to straighten the plate shape, flatness is used as the only indicator to determine whether the straightening process is completed.

[0057] Step 3: applying a pulse current to the metal strip 6 by using the electrode 9 in the rolling tension and pulse current applying device 4, so as to regulate the structure and toughness of the metal strip 6 and remove the residual stress of the metal strip 6 by the pulse current;

[0058] Step 4: The laser ranging array 23 symmetrically arranged at the upper and lower parts of the real-time detection device 2 for the shape of the metal thin strip is used to cooperate with the gantry-type electric high-speed slide 22 to measure the thickness of the metal thin strip 6 in real time, so as to realize the real-time monitoring of the shape of the metal thin strip 6. At the same time, the C-shaped chuck frame 14 is pulled by the servo electric cylinder 8 to complete the real-time adjustment of the shape of the metal thin strip 6.

[0059] Step 5: The rolling tension and pulse current applying device 4 and the transverse tension applying device 5 release the clamping of the metal strip 6, and then the metal strip 6 is sent out of the biaxial stretching area 7 by the winding machine and the unwinding machine, and then the edge of the metal strip 6 is removed by the punching process to obtain a metal strip 6 with qualified performance.

[0060] The metal strip 6 has a width range of ≥20 mm and a thickness range of 0.01 mm - 0.5 mm.

[0061] The rolling direction tension and pulse current applying device 4 and the transverse tension applying device 5 of the bidirectional tension and pulse current applying device 1 can exchange positions as needed to realize the function of applying pulse current along the rolling direction or transverse direction of the metal strip.

[0062] In steps 2 and 3, the initial reference values ​​of the pulse current and tension process parameters during the pulse current assisted post-rolling treatment of the metal strip under bidirectional tension conditions are determined based on the simulation results.

[0063] like Fig.14 As shown in the figure, firstly, an accurate numerical simulation plastic constitutive model is established based on the uniaxial tensile tests along the rolling direction and the transverse direction assisted by pulse currents with different powers, peak currents and duty cycles. Then, the strain distribution of the metal strip 6 during the biaxial tensile stretching process is predicted by numerical simulation. By presetting plate defects such as "stitching" or "two-rib inclined wave shape" in the simulation model, the variation trend of the local deflection during the biaxial stretching process with the tension and pulse current parameters is predicted, thereby constructing a pulse current power P , Action time T , and bidirectional tension F x , F y Local deflection of plate shape ω x , ω y Through-thickness strain ε The mapping relationship between the deflection prediction model (Equation 1, 2) and the thickness strain prediction model (Equation 3) are obtained. The plate shape is scanned in real time by the laser ranging probes arranged symmetrically up and down to obtain the initial plate shape information. Then, according to the prediction model, the process parameters are determined, including the pulse current power P , Action time T With bidirectional tension F x , F y .

[0064]

[0065] In step 3, the microstructure and performance of the metal strip 6 can be efficiently regulated in a short time by pulse current treatment. Taking a 0.05 mm thick stainless steel strip as an example, under tension conditions, the microstructure and mechanical properties obtained by pulse current treatment with a power of 45 W, a peak current of 300 A, and a duty cycle of 30% for 5 minutes show obvious recrystallization compared with those after conventional annealing at the same temperature for 5 minutes. The plasticity of the stainless steel strip is significantly improved, and the deformation resistance is significantly reduced. Fig.15 , 16 As shown, it is beneficial to subsequent forming processing; considering that the pulse current treatment does not need to heat up with the furnace and the processing time is short, it has obvious advantages over conventional heat treatment in terms of post-rolling processing efficiency and energy consumption. At the same time, since the temperature rise only occurs at the metal strip 6, it has little impact on the mechanical structure and monitoring equipment, which is convenient for the implementation of anti-oxidation measures; combined with the bidirectional tension and pulse current application device 1, the purpose of removing residual stress and optimizing organizational properties can be achieved in a short time under the premise of ensuring the elimination of plate shape defects.

[0066] In step three, post-rolling treatment is performed by pulse current, and at the same time, different tensions are applied in both directions to change the stress state of the metal strip, thereby regulating the anisotropy of the structure and organizational properties of the metal strip.

[0067] In step 4, the shape of the metal strip 6 is scanned by the laser ranging array 23 to obtain the local deflection ω x , ω y With thickness t , calculate the flatness Δ , compared with the expected setting value of flatness Δ 1 Flatness Δ The size of the actual flatness Δ Less than the set value Δ1 When the tension and current output are stopped, the machine is cooled under constant tension.

[0068] The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments can be combined with each other to form new embodiments. The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Any modification or equivalent replacement that does not deviate from the spirit and scope of the present invention should be included in the scope of the technical solutions of the present invention.

Claims

1. A pulse current processing device for metal strips under bidirectional tension, characterized in that: The invention comprises a bidirectional tension and pulse current applying device (1), a metal thin strip plate shape real-time detection device (2) and a support base (3), wherein the bidirectional tension and pulse current applying device (1) is fixed to the upper surface of the support base (3) so as to simultaneously apply rolling tension, pulse current and transverse tension to the metal thin strip (6); a fixing column (25) in the metal thin strip plate shape real-time detection device (2) is fixedly connected to the upper and lower surfaces of the support base (3) by bolts; a through hole is opened in the center of the support base (3) so as to measure the plate shape of the metal thin strip (6) by a laser ranging array (23) in the metal thin strip plate shape real-time detection device (2); a sealed chamber (24) is provided outside the working area composed of the bidirectional tension and pulse current applying device (1), the metal thin strip plate shape real-time detection device (2) and the support base (3), and the sealed chamber (24) is filled with nitrogen and helium so as to prevent the metal thin strip (6) from being oxidized in the working area.

2. The pulse current processing device for metal strip under bidirectional tension according to claim 1 is characterized in that: The bidirectional tension and pulse current applying device (1) comprises a rolling tension and pulse current applying device (4) and a transverse tension applying device (5); the rolling tension and pulse current applying device (4) applies rolling tension and pulse current to the metal strip (6) at the same time; the transverse tension applying device (5) applies transverse tension to the metal strip (6); the rolling tension and pulse current applying device (4) is combined with the transverse tension applying device (5) to achieve rapid straightening of the metal strip (6).

3. The pulse current processing device for metal strip under bidirectional tension according to claim 2 is characterized in that: The rolling tension and pulse current applying device (4) comprises a symmetrically arranged rolling tension applying unit, the rolling tension applying unit comprising a ball guide pair (13) and a C-shaped chuck frame (14), the lower surface of the ball guide pair (13) being fixedly connected to the upper surface of the support base (3), the bottom surface of the C-shaped chuck frame (14) cooperating with the upper surface of the ball guide pair (13) to limit the movement trajectory of the C-shaped chuck frame (14), and the protruding portion of the C-shaped chuck frame (14) The upper and lower arms form an action chamber, the upper top surface of the action chamber is connected to the fixed end of the hydraulic cylinder (15), the moving end of the hydraulic cylinder (15) is connected to the center hole of the upper pressure plate (16) through a thread, so that the upper pressure plate (16) is pushed by the hydraulic cylinder (15) to clamp the metal strip (6), the back side of the C-shaped chuck frame (14) is fixedly connected to one end of the columnar dynamometer (12), the other end of the columnar dynamometer (12) is connected to the moving end of the servo electric cylinder (8), and the servo electric The fixed end of the cylinder (8) is fixed in a horizontal position by a fixed bracket (9), the bottom surface of the fixed bracket (9) is fixedly connected to the upper surface of the support base (3), so that the servo electric cylinder (8) pulls the C-shaped chuck frame (14) to apply rolling tension to the metal strip (6), the vertical end of the fixed bracket (9) is provided with a long through hole to enable the metal strip (6) to pass through, and the upper surface of the horizontal end of the fixed bracket (9) is fixed with a conveying roller group (18) to enable the metal strip ( 6), the front end of the lower arm extending from the C-shaped chuck frame (14) is provided with an electrode (19), the electrode (19) is connected to an external power source through a wire (20) to apply a pulse current to the metal strip (6), an insulating lining (17) is provided between the ball guide pair (13) and the C-shaped chuck frame (14), and an insulating joint (11) is provided between the cylindrical dynamometer (12) and the moving end of the servo electric cylinder (8) to prevent the pulse current from overflowing.

4. The pulse current processing device for metal strip under bidirectional tension according to claim 3 is characterized in that: The lateral tension applying device (5) comprises a symmetrically arranged lateral tension applying unit, the lateral tension applying unit comprising a ball guide pair (13) and a C-shaped chuck frame (14), the lower surface of the ball guide pair (13) being fixedly connected to the upper surface of the support base (3), the bottom surface of the C-shaped chuck frame (14) cooperating with the upper surface of the ball guide pair (13) to achieve the limitation of the movement trajectory of the C-shaped chuck frame (14), the bottom surface of the upper arm extending from the C-shaped chuck frame (14) being connected to the fixed end of the hydraulic cylinder (15), the moving end of the hydraulic cylinder (15) being connected to the center hole of the upper pressing plate (16) by means of a thread, so that the upper pressing plate (16) is pushed by the hydraulic cylinder (15) to move the metal thin strip ( 6) clamping, the back side of the C-shaped chuck frame (14) is fixedly connected to one end of the cylindrical dynamometer (12), the other end of the cylindrical dynamometer (12) is connected to the moving end of the servo electric cylinder (8), the fixed end of the servo electric cylinder (8) is fixed in a horizontal position by a fixed bracket (9), the bottom surface of the fixed bracket (9) is fixedly connected to the upper surface of the support base (3), so that the servo electric cylinder (8) pulls the C-shaped chuck frame (14) to apply lateral tension to the metal strip (6), and the bottom surface of the upper pressure plate (16) and the upper surface of the lower arm extending from the C-shaped chuck frame (14) are both provided with an insulating layer (21) to avoid affecting the pulse current flowing through the metal strip (6).

5. The pulse current processing device for metal strip under bidirectional tension according to claim 4 is characterized in that: The metal thin strip plate shape real-time detection device (2) comprises detection units symmetrically arranged at the top and the bottom, the detection unit comprising a gantry-type electric high-speed slide (22) and a laser distance measurement array (23), the movement trajectory of the gantry-type electric high-speed slide (22) is perpendicular to the movement direction of the metal thin strip (6), and the laser distance measurement array (23) is fixed on the moving beam in the gantry-type electric high-speed slide (22) and points vertically to the metal thin strip (6), so as to realize the detection of the plate shape of the metal thin strip (6).

6. The pulse current processing device for metal strip under bidirectional tension according to claim 3 is characterized in that: The bottom surface of the upper pressing plate (16) and the upper surface of the lower arm extending from the C-shaped clamping frame (14) are both provided with corrugated strip grooves to prevent the metal strip from slipping.

7. The pulse current processing device for metal strip under bidirectional tension according to claim 4 is characterized in that: The contact surface between the bottom surface of the upper pressing plate (16) and the insulating layer (21) provided on the upper surface of the lower arm extending out of the C-shaped clamp frame (14) is provided with a corrugated strip groove to prevent the metal strip from slipping.

8. A method for processing a metal strip according to the pulse current processing device for processing a metal strip under bidirectional tension according to claim 5, characterized in that: The specific steps are as follows: Step 1, unwinding the metal strip (6) by means of a winding machine and an unwinding machine, and feeding the metal strip into a bidirectional stretching area (7) of a bidirectional tension and pulse current applying device (1); Step 2: using the hydraulic cylinder (15) in the rolling tension and pulse current applying device (4) and the transverse tension applying device (5) to push the upper pressing plate (16) to clamp the edge of the metal strip (6), and then using the servo electric cylinder (8) to pull the C-shaped clamping head frame (14) to apply rolling tension and transverse tension to the metal strip (6); Step three, using the electrode (19) in the rolling tension and pulse current applying device (4) to apply a pulse current to the metal strip (6), thereby regulating the structure and toughness of the metal strip (6) through the pulse current, and removing the residual stress of the metal strip (6); Step 4: Using the laser distance measuring array (23) symmetrically arranged at the upper and lower parts of the metal thin strip real-time shape detection device (2) to cooperate with the gantry-type electric high-speed slide table (22) to measure the thickness of the metal thin strip (6) in real time, so as to achieve real-time monitoring of the shape of the metal thin strip (6). At the same time, the C-shaped chuck frame (14) is pulled by the servo electric cylinder (8) to complete the real-time adjustment of the shape of the metal thin strip (6); In step five, the rolling tension and pulse current applying device (4) and the transverse tension applying device (5) release the clamping of the metal strip (6), and then the metal strip (6) is sent out of the biaxial stretching area (7) by the cooperation of the winding machine and the unwinding machine, and then the edge of the metal strip (6) is removed by a punching process to obtain a metal strip (6) with qualified performance.

9. A metal strip processing method according to claim 8, characterized in that: In the second step, the clamped width of the metal strip (6) does not exceed 1 / 10 of the width of the metal strip (6).

10. A metal strip processing method according to claim 8, characterized in that: In step 4, the plate shape is scanned by a laser ranging probe to obtain the local deflection ω x , ω y With thickness t , calculate the flatness Δ , compared with the expected set value of flatness Δ 1 Flatness Δ The size of the flatness Δ Less than the set value Δ1 When the tension and current output are stopped, the machine is cooled under constant tension.

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