A copper alloy narrow strip continuous deep cold rolling device and process

Abstract

A continuous deep cold rolling apparatus for copper alloy narrow strip includes a first narrow strip coiler and a second narrow strip coiler. The ends of the narrow strip are wound around the two coilers and can be driven to reciprocate between the two coilers. The first narrow strip coiler is located in a first protective shell with an opening, and the second narrow strip coiler is located in a second protective shell with an opening. The openings of the first and second protective shells face each other, allowing the narrow strip to pass through. Upper and lower working rolls are arranged between the two protective shells. The narrow strip is fully or partially immersed in a first liquid nitrogen in the first protective shell and fully or partially immersed in a second liquid nitrogen in the second protective shell. Outside the protective shells, the narrow strip passes through the roll gap between the upper and lower working rolls. The present invention enables continuous deep cold rolling of narrow plates or coiled copper alloy narrow strip with large dimensions in the rolling direction, producing rare earth copper alloys with ultrafine grains / nano-twins, high mechanical properties, and high electrical conductivity. The apparatus and process also have low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of copper alloy narrow strip rolling, and in particular relates to a copper alloy narrow strip continuous deep cold rolling device and process. Background Art

[0002] With the development of high-tech, the electrical and electronic fields are placing high demands on high-strength, high-conductivity copper alloys, demanding higher strength and improved conductivity. Rare earth elements, considered "industrial vitamins," have a favorable modifying effect on metal materials, especially copper alloys, including refining cast dendrites, promoting second-phase precipitation, and purifying the matrix. Therefore, rare earth copper alloys hold great potential for achieving high-strength, high-conductivity combined performance. Furthermore, studies have shown that twin boundaries scatter electrons less than conventional small- and large-angle grain boundaries, with resistivities even an order of magnitude lower. Introducing a large number of twin boundaries into copper alloys with low stacking fault energy to achieve improved conductivity is a viable approach.

[0003] The large plastic deformation process is a preparation process for ultrafine-grained / nano-twinned metal materials with ultra-high strength and good ductility. It can introduce a high proportion of ultrafine grains, nano-twins and a high density of dislocations into the alloy, thereby preparing metal materials with excellent comprehensive performance. Large plastic deformation processes include equal-channel angular extrusion, high-pressure torsion, and the emerging deep cold rolling process in recent years. Unlike the equal-channel angular extrusion process that uses shear deformation to achieve grain refinement, the deep cold rolling process uses a deep cold environment to suppress the dynamic recovery of dislocation aggregation and annihilation during the deformation process of the alloy and the dynamic recrystallization of grains due to deformation heat to achieve the preparation of nanocrystalline materials. Compared with other large plastic deformation processes, the deep cold rolling process has unique advantages in achieving industrial production and reducing equipment modification costs.

[0004] Currently, cryogenic rolling processes typically combine a single-pass pre-rolling cryogenic treatment with liquid nitrogen immersion, followed by synchronous or asynchronous rolling. When producing narrow plates or coiled narrow strips with large rolling dimensions, the temperature rise caused by the material's contact with air during rolling significantly reduces the effectiveness of the cryogenic treatment. The usual solution is to place the entire rolling mill in a low-temperature, enclosed space, lowering the operating temperature to minimize heat exchange between the material and the environment. However, this involves significant costs associated with equipment relocation and plant renovation, hindering the industrialization and application of cryogenic rolling processes. Summary of the Invention

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a continuous deep cold rolling device and process for copper alloy narrow strips, so as to realize the continuous deep cold rolling of narrow plates or coiled copper alloy narrow strips with larger rolling direction dimensions, and to prepare rare earth copper alloys with high mechanical properties and high electrical conductivity with ultrafine grains / nano twins, and the device and process also have low cost.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A copper alloy narrow strip continuous deep cold rolling device comprises a first narrow strip coiler and a second narrow strip coiler, wherein the ends of the narrow strip are respectively wound around the first narrow strip coiler and the second narrow strip coiler and can be driven to reciprocate between the two coilers; the first narrow strip coiler is located in a first protective shell with an opening, and the second narrow strip coiler is located in a second protective shell with an opening, the first protective shell and the second protective shell opening being opposite to each other for the narrow strip to pass through; an upper working roll and a lower working roll are arranged between the first protective shell and the second protective shell, the narrow strip is fully or partially immersed in a first liquid nitrogen in the first protective shell and fully or partially immersed in a second liquid nitrogen in the second protective shell, and passes through the roll gap between the upper working roll and the lower working roll outside the protective shell.

[0008] In one embodiment of the present invention, the top end of the first protective shell is connected to the first liquid nitrogen supply tank, and the bottom end is connected to the first liquid nitrogen recovery tank. The first liquid nitrogen in the first protective shell is provided by the first liquid nitrogen supply tank and is recovered by the first liquid nitrogen recovery tank; the top end of the second protective shell is connected to the liquid nitrogen supply tank, and the bottom end is connected to the liquid nitrogen recovery tank. The second liquid nitrogen in the second protective shell is provided by the second liquid nitrogen supply tank and is recovered by the second liquid nitrogen recovery tank.

[0009] In one embodiment of the present invention, a first guide roller is provided at the opening position of the first protective shell, and a second guide roller is provided at the opening position of the second protective shell. The first protective shell can rotate counterclockwise by 20 to 30 degrees around the first guide roller, and the second protective shell can rotate clockwise by 20 to 30 degrees around the second guide roller. The first guide roller and the second guide roller guide the narrow belt to remain horizontal after exiting the protective shell outlet.

[0010] In one embodiment of the present invention, the cross-sections of the first protective shell and the second protective shell perpendicular to the roller axis are teardrop-shaped, the opening is located in the narrow part of the teardrop-shaped shape, and the winder is located in the wide part of the teardrop-shaped shape. By adjusting the rotation angle of the first protective shell around the first guide roller and the rotation angle of the second protective shell around the second guide roller, the immersion degree of the narrow strip of the winder in liquid nitrogen is adjusted, and the tension of the narrow strip is increased.

[0011] In one embodiment of the present invention, the first guide roller is partially immersed in the first liquid nitrogen in the first protective shell, and the second guide roller is partially immersed in the second liquid nitrogen in the second protective shell. The narrow belt is fully or partially immersed in the first liquid nitrogen in the first protective shell and fully or partially immersed in the second liquid nitrogen in the second protective shell. The first guide roller and the second guide roller guide the narrow belt to be immersed in the liquid nitrogen before exiting the protective shell outlet, and guide the narrow belt to remain horizontal after exiting the protective shell outlet.

[0012] In one embodiment of the present invention, the first narrow strip winder is installed in a first protective shell, and the first liquid nitrogen is contained in the first protective shell; the second narrow strip winder is installed in a second protective shell, and the second liquid nitrogen is contained in the second protective shell.

[0013] In one embodiment of the present invention, the first narrow strip winder and the second narrow strip winder are driven by independent motors respectively.

[0014] In one embodiment of the present invention, the upper working roll and the lower working roll adopt the same / different roll diameters and the same / different rotation speeds. When the rolling direction is alternately changed, the narrow strip coilers on both sides take turns serving as the raw material coiler and the product coiler.

[0015] In one embodiment of the present invention, the interval L1 between the opening of the first protective shell and the working roll is the same as the interval L2 between the opening of the second protective shell and the working roll, and L1 and L2 should be as small as possible without affecting the normal operation of the working roll. The smaller the value, the shorter the contact time between the narrow belt and the external environment, and the less heat is exchanged.

[0016] The present invention also provides a continuous deep cold rolling method using the copper alloy narrow strip continuous deep cold rolling device, comprising the following steps:

[0017] Step 1: Determine the distance between the protective shell and the working roll, install the first and second protective shells, install one end of the narrow strip on the first narrow strip winder, and pass the other end through the roll gap between the upper and lower working rolls, and then set it on the second narrow strip winder;

[0018] Step 2: Start the first narrow strip winder and the second narrow strip winder to initially form tension on the narrow strip;

[0019] Step 3: Rotate the first protective shell 20 to 30 degrees counterclockwise around the first guide roller, and rotate the second protective shell 20 to 30 degrees clockwise around the second guide roller to further increase the tension on the narrow belt;

[0020] Step 4: Open the first liquid nitrogen supply tank and the second liquid nitrogen supply tank to add liquid nitrogen to the first protective shell and the second protective shell until they are full, and maintain continuous supply;

[0021] Step 5: Open the upper and lower working rolls, set the single-pass roll gap, and start rolling until the effective length of the narrow strip on the first narrow strip coiler has been rolled;

[0022] Step 6: Pause the rolling mill and change the rolling direction.

[0023] Step 7: Open the upper and lower working rolls, set the single-pass roll gap, and start rolling until the effective length of the narrow strip on the second narrow strip coiler has been rolled;

[0024] Step 8: Pause the rolling mill and change the rolling direction.

[0025] Step 9: Repeat steps 5 to 8, and continue production until the thickness of the narrow strip reaches the target total rolling deformation, and the rolling is completed.

[0026] Step 10: Open the first liquid nitrogen recovery tank and the second liquid nitrogen recovery tank to recover the remaining liquid nitrogen;

[0027] Step 11: Rotate the first protective shell 20 to 30 degrees clockwise around the first guide roller, and rotate the second protective shell 20 to 30 degrees counterclockwise around the second guide roller, remove the tension on the narrow belt, and take it off from the narrow belt winder on one side.

[0028] In one embodiment of the present invention, the narrow strip is a strip with a width of 50 to 200 mm that can be slightly bent or completely bent into a coil, and the copper alloy composition is a high-strength and high-conductivity copper alloy such as a Cu-Ag alloy.

[0029] In one embodiment of the present invention, the copper alloy narrow strip is subjected to the continuous deep cold rolling method, and the total rolling reduction rate reaches more than 90%. The obtained product has a strength greater than or equal to 600 MPa, a Vickers hardness greater than or equal to 200 HV, and a conductivity greater than or equal to 60% IACS, and has high mechanical properties and high electrical conductivity.

[0030] Compared with the prior art, the beneficial effects of the present invention are: it can greatly reduce the unnecessary loss of cryogenic treatment effect in the process of cryogenic rolling in the links of material transportation and transmission, and obtain more rigorous and accurate experimental conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the device of the present invention.

[0032] Figure 2 It is a schematic diagram of the structure of the device of the present invention (adjusting the angle of the protective shell).

[0033] In the picture:

[0034] 1—first guide roller; 2—first liquid nitrogen recovery tank; 3—first liquid nitrogen supply tank; 4—first narrow strip coiler; 5—narrow strip; 6—first protective shell; 7—upper working roller; 8—second protective shell; 9—second narrow strip coiler; 10—second liquid nitrogen supply tank; 11—second liquid nitrogen recovery tank; 12—second guide roller; 13—lower working roller; 14—first liquid nitrogen; 15—second liquid nitrogen. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below with reference to the accompanying drawings and examples.

[0036] like Figure 1 and Figure 2 As shown, the present invention provides a continuous deep cold rolling device for copper alloy narrow strips, which consists of three parts: a narrow strip protection device that can achieve continuous cooling, a liquid nitrogen supply / recovery device, and a structure that can achieve continuous forward and reverse differential speed / asynchronous rolling. The first part of the narrow strip protection device mainly includes a first guide roller 1, a first protective shell 6, a second protective shell 8, and a second guide roller 12. The first protective shell 6 contains a first liquid nitrogen 14, and the second protective shell 8 contains a second liquid nitrogen 15. The two protective shells have openings, and the openings are opposite each other. Two guide rollers are respectively arranged at the openings of the two protective shells, and the protective shells can rotate around the guide rollers at a certain angle (20 to 30 degrees). The second part of the liquid nitrogen supply / recovery device mainly includes a first liquid nitrogen recovery tank 2, a first liquid nitrogen supply tank 3, a second liquid nitrogen supply tank 10, and a second liquid nitrogen recovery tank 11. The liquid nitrogen supply tank continuously supplies liquid nitrogen to the inner cavities of the two protective shells. After processing is completed, the excess liquid nitrogen can be recovered by the liquid nitrogen recovery tank. The third section, a continuous forward and reverse variable speed / asynchronous rolling structure, primarily comprises a first narrow strip coiler 4, a second narrow strip coiler 9, upper work rolls 7, and lower work rolls 13. The first narrow strip coiler 4 is housed in a first protective shell 6, while the second narrow strip coiler 9 is housed in a second protective shell 8. The upper work roll 7 and lower work roll 13 face each other, forming a roll gap. The upper and lower work rolls 7 and 13 are positioned between openings in the two protective shells, allowing the narrow strip 5 to pass through the roll gap. One end of the narrow strip 5 to be rolled is mounted on the first narrow strip coiler 4 on one side, while the other end passes through the roll gap between the upper and lower work rolls 7 and 13 before being mounted on the second narrow strip coiler 9 on the other side, where tension is applied. The rotation of the protective shells around the guide rollers causes the narrow strip 5 in the first and second protective shells 6 and 8 to be fully or partially immersed in liquid nitrogen, increasing the tension in the strip 5. The entire section of the narrow strip 5 before exiting the outlets of the first and second protective shells 6 and 8 should be immersed in liquid nitrogen.

[0037] The main principle of the present invention is to use a cylindrical container to simultaneously hold liquid nitrogen and the rolled narrow strip, so as to achieve continuous cooling of the material before entering the rollers and after leaving the rollers, shorten the time and scale of the material's contact with the external environment during transportation and transmission, ensure a long-term stable low-temperature deformation environment, inhibit the dynamic recovery of dislocations, increase the density of crystal defects such as dislocations and grain boundaries in the alloy, and improve the performance of the copper alloy.

[0038] In an embodiment of the present invention, the cross-section of the first protective shell 6 and the second protective shell 8 perpendicular to the roller axis direction is teardrop-shaped, the opening of the protective shell is located in the narrow part of the teardrop shape, and the first narrow strip winder 4 and the second narrow strip winder 9 are respectively located in the wide part of the teardrop shape. By adjusting the rotation angle of the first protective shell 6 around the first guide roller 1 and the rotation angle of the second protective shell 8 around the second guide roller 12, the immersion degree of the narrow strip 5 on the winder in the corresponding liquid nitrogen can be adjusted, and the tension on the narrow strip 5 can be increased.

[0039] In an embodiment of the present invention, the first narrowband winder 4 and the second narrowband winder 9 are respectively installed on the first protective shell 6 and the second protective shell 8, and are driven by independent motors. Their diameters R1 and R3 and the internal cavity sizes R2 and R4 of the shells can be set according to the actual narrowband size or other requirements.

[0040] In the embodiment of the present invention, the shell walls of the first protective shell 6 and the second protective shell 8 may be filled with vacuum or thermal insulation cotton to improve the thermal insulation effect and reduce liquid nitrogen loss. Thermal insulation measures may also be taken in each gap.

[0041] In this embodiment of the present invention, a first guide roller 1 is provided between the first narrow strip coiler 4 and the upper work roll 7, and a second guide roller 12 is provided between the second narrow strip coiler 9 and the lower work roll 13. The first guide roller 1 is mounted on the first protective shell 6 and positioned near the shell outlet. The second guide roller 12 is mounted on the second protective shell 8 and positioned near the shell outlet. These two guide rollers ensure that the narrow strip 5 is parallel to the plane of the roll gap when entering and exiting the work roll gap, and that it is immersed in liquid nitrogen before passing through the outlet.

[0042] In the embodiment of the present invention, the first liquid nitrogen recovery tank 2, the first liquid nitrogen supply tank 3, the second liquid nitrogen supply tank 10 and the second liquid nitrogen recovery tank 11 are provided with switches for easy control.

[0043] In an embodiment of the present invention, the upper working roll 7 and the lower working roll 13 can adopt the same / different roll diameters and the same / different rotation speeds. When the rolling direction is alternately changed, the narrow strip coilers on both sides take turns as the raw material coiler and the product coiler.

[0044] In an embodiment of the present invention, the distances L1 and L2 between the narrow belt protection structures on both sides and the working rolls are the same, and the value should be as small as possible without affecting the normal operation of the working rolls. The smaller the value, the shorter the contact time between the narrow belt and the external environment, and the less heat exchanged.

[0045] According to the copper alloy narrow strip continuous deep cold rolling device of the present invention, the corresponding continuous deep cold rolling method comprises the following steps:

[0046] Step 1: Determine reasonable distances L1 and L2, place the first protective shell 6 and the second protective shell 8, install one end of the narrow strip 5 on the first narrow strip winder 4, and pass the other end through the gap between the upper working roll 7 and the lower working roll 13, and then place it on the second narrow strip winder 10;

[0047] Step 2: Start the first narrow strip winder 4 and the second narrow strip winder 10 to initially form tension on the narrow strip 5;

[0048] Step 3: Rotate the first protective shell 6 around the first guide roller 1 by 20 to 30 degrees counterclockwise, and the second protective shell 8 around the second guide roller 12 by 20 to 30 degrees clockwise, so as to further increase the tension of the narrow belt 5. Figure 2 As shown;

[0049] Step 4: Open the first liquid nitrogen supply tank 3 and the second liquid nitrogen supply tank 10 to add liquid nitrogen to the first protective shell 6 and the second protective shell 8 until they are full, and maintain continuous supply;

[0050] Step 5: Open the upper working roll 7 and the lower working roll 13, set a single-pass roll gap, and start rolling until the effective length of the narrow strip 5 on the first narrow strip coiler 4 has been rolled;

[0051] Step 6: Pause the rolling mill and change the rolling direction.

[0052] Step 7: Open the upper working roll 7 and the lower working roll 13, set a single-pass roll gap, and start rolling until the effective length of the narrow strip 5 on the second narrow strip coiler 10 has been rolled;

[0053] Step 8: Pause the rolling mill and change the rolling direction.

[0054] Step 9: Repeat steps 5 to 8, and continue production until the thickness of the narrow strip reaches the target total rolling deformation, and the rolling is completed.

[0055] Step 10: Open the first liquid nitrogen recovery tank and the second liquid nitrogen recovery tank to recover the remaining liquid nitrogen;

[0056] Step 11: Rotate the first protective shell 6 20 to 30 degrees clockwise around the first guide roller 1, and rotate the second protective shell 8 20 to 30 degrees counterclockwise around the second guide roller 12, remove the tension on the narrow belt 5, and remove the narrow belt 5 from the narrow belt winder on one side.

[0057] Taking the continuous deep cold rolling of Cu-5Ag-0.55Ce (wt.%) copper alloy narrow strip as an example, it includes the following steps:

[0058] Step 1: Determine a reasonable distance L1 = L2 = 5 mm, place the first protective shell 6 and the second protective shell 8, install one end of the narrow strip 5 on the first narrow strip winder 4, and pass the other end through the roll gap between the upper working roll 7 and the lower working roll 13, and then set it on the second narrow strip winder 10;

[0059] Step 2: Start the first narrow strip winder 4 and the second narrow strip winder 10 to initially form tension on the narrow strip 5, with the tension being 30 MPa;

[0060] Step 3: rotate the first protective shell 6 25 degrees counterclockwise around the first guide roller 1, and rotate the second protective shell 8 25 degrees clockwise around the second guide roller 12, further increasing the tension of the narrow belt 5 to about 40 MPa;

[0061] Step 4: Open the first liquid nitrogen supply tank 3 and the second liquid nitrogen supply tank 10 to add liquid nitrogen to the first protective shell 6 and the second protective shell 8 until they are full, and maintain continuous supply;

[0062] Step 5: Open the upper working roll 7 and the lower working roll 13, set the single-pass deformation to 5%, and start rolling until the effective length of the narrow strip 5 on the first narrow strip coiler 4 has been rolled;

[0063] Step 6: Pause the rolling mill and change the rolling direction.

[0064] Step 7: Open the upper working roll 7 and the lower working roll 13, set the single-pass deformation to 5%, and start rolling until the effective length of the narrow strip 5 on the second narrow strip coiler 10 has been rolled;

[0065] Step 8: Pause the rolling mill and change the rolling direction.

[0066] Step 9: Repeat steps 5 to 8, and continue production until the total rolling deformation of the narrow strip reaches 90%, and the rolling is completed;

[0067] Step 10: Open the first liquid nitrogen recovery tank and the second liquid nitrogen recovery tank to recover the remaining liquid nitrogen;

[0068] Step 11: Rotate the first protective shell 6 25 degrees clockwise around the first guide roller 1, and rotate the second protective shell 8 25 degrees counterclockwise around the second guide roller 12, remove the tension on the narrow belt 5, and remove the narrow belt 5 from the narrow belt winder on one side.

[0069] The performance statistics of the alloy finally obtained are shown in Table 1

[0070] Table 1 Cu-Ag-Ce alloy performance statistics

[0071] performance Measured value 1 Measured value 2 Measured value 3 Measured value 4 Measured value 5 average value Standard deviation Vickers hardness 215.2 221.4 222.7 220.2 224.0 220.70 3.39 Electrical conductivity 69.4 66.8 68.1 65.8 67.1 67.44 1.36 Yield strength 623 609 622 — — 618.0 7.8 Ultimate tensile strength 639 636 658 — — 644.3 11.9

Claims

1. A copper alloy narrow strip continuous deep cold rolling device, characterized in that: The invention comprises a first narrow strip winder (4) and a second narrow strip winder (9), wherein a narrow strip (5) is wound on the first narrow strip winder (4) and the second narrow strip winder (9) and can be driven to perform reciprocating motion between the two narrow strip winders; the first narrow strip winder (4) is located in a first protective shell (6) with an opening, and the second narrow strip winder (9) is located in a second protective shell (8) with an opening, and the openings of the first protective shell (6) and the second protective shell (8) are opposite to each other, so that the narrow strip (5) can pass through; An upper working roll (7) and a lower working roll (13) are arranged between the first protective shell (6) and the second protective shell (8); the narrow strip (5) is fully or partially immersed in the first liquid nitrogen (14) in the first protective shell (6) and fully or partially immersed in the second liquid nitrogen (15) in the second protective shell (8); and passes through the roll gap between the upper working roll (7) and the lower working roll (13) outside the first and second protective shells; A first guide roller (1) is provided at the opening position of the first protective shell (6), and a second guide roller (12) is provided at the opening position of the second protective shell (8). The first protective shell (6) can rotate 20 to 30 degrees counterclockwise around the first guide roller (1), and the second protective shell (8) can rotate 20 to 30 degrees clockwise around the second guide roller (12). The first guide roller (1) and the second guide roller (12) guide the narrow belt (5) to remain horizontal after exiting the first and second protective shell outlets. The cross-sections of the first protective shell (6) and the second protective shell (8) perpendicular to the roller axis are teardrop-shaped, the opening is located at the narrow part of the teardrop-shaped shape, and the first and second narrow strip winders are located at the wide part of the teardrop-shaped shape. By adjusting the rotation angle of the first protective shell (6) around the first guide roller (1) and the rotation angle of the second protective shell (8) around the second guide roller (12), the immersion degree of the narrow strips (5) of the first and second narrow strip winders in liquid nitrogen is adjusted, and the tension of the narrow strips (5) is increased.

2. The copper alloy narrow strip continuous deep cold rolling device according to claim 1, characterized in that: The top end of the first protective shell (6) is connected to the first liquid nitrogen supply tank (3), and the bottom end is connected to the first liquid nitrogen recovery tank (2); the first liquid nitrogen (14) in the first protective shell is provided by the first liquid nitrogen supply tank (3) and is recycled by the first liquid nitrogen recovery tank (2); The top end of the second protective shell (8) is connected to the second liquid nitrogen supply tank (10), and the bottom end is connected to the second liquid nitrogen recovery tank (11); the second liquid nitrogen (15) in the second protective shell is provided by the second liquid nitrogen supply tank (10) and is recycled by the second liquid nitrogen recovery tank (11).

3. The copper alloy narrow strip continuous deep cold rolling device according to claim 1, characterized in that: The first guide roller (1) is partially immersed in the first liquid nitrogen (14) in the first protective shell (6), and the second guide roller (12) is partially immersed in the second liquid nitrogen (15) in the second protective shell (8). The narrow belt (5) is fully or partially immersed in the first liquid nitrogen (14) in the first protective shell (6), and is fully or partially immersed in the second liquid nitrogen (15) in the second protective shell (8). The first guide roller (1) and the second guide roller (12) guide the narrow belt (5) to be immersed in the liquid nitrogen before exiting the first and second protective shell outlets, and guide the narrow belt (5) to remain horizontal after exiting the first and second protective shell outlets.

4. The copper alloy narrow strip continuous deep cold rolling device according to claim 1, characterized in that: The first narrow strip coiler (4) and the second narrow strip coiler (9) are driven by independent motors respectively; the upper working roll (7) and the lower working roll (13) adopt the same / different roll diameters and the same / different rotation speeds. When the rolling direction is alternately changed, the first and second narrow strip coilers on both sides take turns as the raw material coiler and the product coiler.

5. The copper alloy narrow strip continuous deep cold rolling device according to claim 1, characterized in that: The interval L1 between the opening of the first protective shell (6) and the upper and lower working rollers is the same as the interval L2 between the opening of the second protective shell (8) and the working rollers, and L1 and L2 should be as small as possible without affecting the normal operation of the working rollers. The smaller the value, the shorter the contact time between the narrow belt (5) and the external environment, and the less heat is exchanged.

6. A continuous deep cold rolling method using the copper alloy narrow strip continuous deep cold rolling apparatus according to any one of claims 1 to 5, characterized in that: The steps include: Step 1: Determine the spacing between the first and second protective shells and the upper and lower working rollers, install the first protective shell (6) and the second protective shell (8), install one end of the narrow strip (5) on the first narrow strip winder (4), pass the other end through the gap between the upper working roller (7) and the lower working roller (13), and then install it on the second narrow strip winder (9); Step 2: Start the first narrow strip winder (4) and the second narrow strip winder (9) to initially form tension on the narrow strip (5); Step 3: rotate the first protective shell (6) counterclockwise by 20 to 30 degrees around the first guide roller (1), and rotate the second protective shell (8) clockwise by 20 to 30 degrees around the second guide roller (12), thereby further increasing the tension on the narrow belt (5); Step 4: Open the first liquid nitrogen supply tank (3) and the second liquid nitrogen supply tank (10) to add liquid nitrogen to the first protective shell (6) and the second protective shell (8) until they are full, and maintain continuous supply; Step 5: Open the upper working roll (7) and the lower working roll (13), set the single-pass roll gap and start rolling until the effective length of the narrow strip (5) on the first narrow strip coiler (4) has been rolled; Step 6: Pause the upper working roll (7) and the lower working roll (13) and change the rolling direction; Step 7: Open the upper working roll (7) and the lower working roll (13), set the single-pass roll gap and start rolling until the effective length of the narrow strip (5) on the second narrow strip coiler (9) has been rolled; Step 8: Pause the upper working roll (7) and the lower working roll (13) and change the rolling direction; Step 9: Repeat steps 5 to 8, and continue production until the thickness of the narrow strip reaches the target total rolling deformation, and the rolling is completed. Step 10: Open the first liquid nitrogen recovery tank (2) and the second liquid nitrogen recovery tank (11) to recover the remaining liquid nitrogen; Step 11: Rotate the first protective shell (6) around the first guide roller (1) by 20 to 30 degrees clockwise, and rotate the second protective shell (8) around the second guide roller (12) by 20 to 30 degrees counterclockwise, remove the tension on the narrow belt (5), and remove the narrow belt (5) from the first and second narrow belt winders wound on one side.

7. The continuous deep cold rolling method according to claim 6, characterized in that: The copper alloy component is a Cu-Ag alloy, and the narrow strip (5) is a strip with a width of 50 to 200 mm and can be slightly bent or completely bent into a coil.

8. The continuous deep cold rolling method according to claim 6, characterized in that: When the copper alloy narrow strip is a Cu-5Ag alloy, after the continuous deep cold rolling method, the total rolling reduction reaches more than 90%, the product strength is greater than or equal to 600 MPa, the Vickers hardness is greater than or equal to 200 HV, and the conductivity is greater than or equal to 60% IACS.

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