A metal strip rolling device and a rolling method

Abstract

The present application relates to a kind of metal strip rolling device and rolling method, and the columnar structure of the surface of working roll is provided with wave-shaped concave-convex part, the linear speed of each point in the axial direction of the curved surface shape of working roll is different, transverse shear rubbing of metal can be generated in the rolling process, cooperate with the longitudinal rubbing of metal generated by the speed difference of upper working roll and lower working roll in rolling process, so that metal is " bidirectional rubbing " in deformation zone, the stress state of metal in rolling deformation zone is improved, the rolling force can be minimized, and ultra-thin strip with high hardness is produced;And cooperate with the method of asynchronous rolling, change the compressive stress state in deformation zone and increase shear deformation, can significantly reduce the rolling pressure, can increase the total deformation of a rolling pass, reduce the rolling pass and the number of intermediate annealing, and further improve the rolling capacity of rolling mill;Simultaneously, it can also prevent the problem of slipping between the two working rolls when supporting roller main drive, improve the surface quality of strip.

Description

Technical Field

[0001] This invention relates to the field of rolling technology, and in particular to a metal strip rolling apparatus and rolling method. Background Technology

[0002] Metal strip refers to metal materials with a large aspect ratio, including steel strip, copper strip, aluminum strip, stainless steel strip, titanium strip, or alloy strip, etc. Among them, the thicker strip is produced by hot rolling mill, while the thinner strip needs to be further rolled thinner by cold rolling mill on the basis of hot rolling strip until the required thickness of finished product is achieved.

[0003] However, with the development of the electronics and electrical appliance industry, the instrumentation industry, and the micro-electromechanical industry, the requirements for the thickness of metal strips for various small or micro parts and structural or functional materials are becoming increasingly thinner, such as Hastelloy strips, Invar alloys, and watch springs, some of which have a minimum thickness of only a few micrometers.

[0004] Existing rolling equipment generally reduces the gap between two work rolls rotating in opposite directions, allowing the metal to flow and extend longitudinally in a direction perpendicular to the roll axis, thereby reducing the strip thickness. However, since the rolling force is greater for thinner strips, the elastic deformation of the work rolls is also greater. Therefore, when rolling strips with high deformation resistance and very thin thickness, the strip thickness may be less than the elastic deformation of the rolls. This makes it impossible for existing rolling devices and methods to produce metal strips with higher hardness and thinner thickness. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the difficulty of producing metal strips with higher hardness and thinner thickness using existing rolling equipment and rolling methods.

[0006] To solve the above-mentioned technical problems, the present invention provides a metal strip rolling apparatus, comprising,

[0007] The rolling unit includes a work roll assembly and a pressure device. The work roll assembly includes an upper work roll and a lower work roll. The upper and lower work rolls are columnar structures with wavy protrusions and concave portions on their surfaces. The wavy protrusions and concave portions of the upper and lower work rolls are symmetrically arranged around their central parts, and the protrusions / concave portions of the upper work roll and the concave portions / protrusions of the lower work roll fit together. The pressure device is used to control the pressing force between the upper and lower work rolls, and a pressure sensor is installed on the pressure device.

[0008] A rolling unit, comprising a first rolling roll group and a second rolling roll group respectively disposed on both sides of the rolling unit along the rolling direction;

[0009] A guide gauge speed measuring unit, which comprises a first guide gauge speed measuring assembly and a second guide gauge speed measuring assembly respectively arranged on both sides of the rolling unit along the rolling direction;

[0010] A coiling unit, which comprises a first coiling machine and a second coiling machine, the strip coiled on the first coiling machine passes through the first guide gauge speed measuring assembly and the first set of backup rolls, then passes between the two work rolls, and then passes through the second set of backup rolls and the second guide gauge speed measuring assembly to be coiled on the second coiling machine;

[0011] A shaping unit, which is used for shaping the semi-finished strip on the second coiling machine.

[0012] In an embodiment of the present application, a backup roll set is further included, which comprises an upper backup roll and a lower backup roll, the upper backup roll is used for supporting the upper work roll, and the lower backup roll is used for supporting the lower work roll.

[0013] In an embodiment of the present application, the height difference between the concave and convex surfaces of the upper work roll and the lower work roll is 0.01mm-5mm.

[0014] In an embodiment of the present application, when the middle parts of the upper work roll and the lower work roll are in contact, the gap between the end parts of the two is 0.01mm-0.08mm.

[0015] In an embodiment of the present application, a thickness gauge is further included for measuring the thickness of the strip, the thickness gauge is arranged on both sides of the rolling unit.

[0016] In an embodiment of the present application, the upper work roll can be a convex roll with only one convex part or a concave roll with only one concave part, and the lower work roll can be a concave roll or a convex roll matched with the upper work roll.

[0017] In an embodiment of the present application, a controller is further included, which is used for controlling the rolling unit, the backup rolling unit and the coiling unit.

[0018] A metal strip rolling method, which utilizes the metal strip rolling device of any one of the above-mentioned embodiments to roll the metal strip, comprising the following steps,

[0019] Step S1: the rolling unit is operated empty at a predetermined strip passing roll gap and a predetermined strip passing speed for a predetermined time, and the rotating speed of the upper work roll is set to be greater than that of the lower work roll;

[0020] Step S2: the first coiling machine rotates at a threading speed, and the strip material thereon is sequentially sent into the space between the upper work roll and the lower work roll through the first guide speed measuring assembly and the first roll set, and is sequentially sent through the second roll set and the second guide speed measuring assembly at the threading speed, and is finally coiled on the second coiling machine, until the strip material is coiled to a preset length on the second coiling machine, and the threading is completed;

[0021] Step S3: the pressure value, the roll gap value, the coiling force value and the running speed of the strip material and the like are adjusted to predetermined values, the thickness data of the strip material are detected in real time and compared with the design value, the values of the parameters are dynamically adjusted, and the strip material is dynamically rolled; when the strip material on the first coiling machine 41 remains a preset length, the speed of the strip material is reduced to the threading speed, until the strip material is completely coiled on the second coiling machine 42, the device stops, and the rolling of the strip material in one pass is completed;

[0022] Step S4: the rolling direction of the device is reversed, and steps S1-S3 are repeated to perform rolling in the next pass, until the thickness of the strip material reaches a predetermined thickness, and the rolling of the semi-finished strip material is completed;

[0023] Step S5: the semi-finished strip material is sent to a shaping unit to be shaped and edged to produce a finished strip material.

[0024] In an embodiment of the present application, the rotating speed of the upper work roll and the lower work roll is 20 rpm-900 rpm, and the rotating speed difference of the upper work roll and the lower work roll is 10%-45%.

[0025] The above technical solution of the present application has the following advantages compared with the prior art:

[0026] The metal strip rolling device and the rolling method of the present application, the upper work roll and the lower work roll are columnar structures with wave-shaped concave-convex parts on the surfaces, and the wave-shaped concave-convex parts of the upper work roll and the lower work roll are symmetrically arranged at the centers thereof. The curved surface shape of the work rolls makes the linear speeds of the points in the axial direction of the work rolls different. In the process of rolling the metal strip, transverse shearing and rubbing of the metal can be generated, and in combination with the longitudinal rubbing of the metal generated by the rotating speed difference of the upper work roll and the lower work roll in the rolling process, the metal is "rubbed in two directions" in the deformation zone, the stress state of the metal in the rolling deformation zone is improved, the rolling force can be minimized, and ultra-thin strip materials with high hardness can be produced. Therefore, compared with conventional rolling, the rolling pressure can be significantly reduced, the deformation amount of each pass can be increased, the total rolling passes and the intermediate annealing times can be reduced, the thinning capacity and the production efficiency of the rolling mill can be improved, and the problem of slippage between the support roll main transmission and the two work rolls can be prevented, and the surface quality of the strip material can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] For the purpose of making the content of the present application more easily understood, the present application will be further explained in detail below according to the specific embodiments of the present application and in conjunction with the drawings, in which

[0028] Figure 1 is a schematic diagram of the overall structure of the metal strip rolling device of the preferred embodiment of the present application;

[0029] Figure 2 is a schematic diagram of the rolling unit of the metal strip rolling device shown in Figure 1 ;

[0030] Figure 3 is a schematic diagram of the work roll set and the backup roll set of the metal strip rolling device shown in Figure 1 ;

[0031] Explanation of the drawing marks in the specification: 1, rolling unit; 11, work roll set; 111, upper work roll; 112, lower work roll; 12, backup roll set; 121, upper backup roll; 122, lower backup roll; 13, pressure device; 131, pressure sensor; 2, rolling aid unit; 21, first rolling aid roll set; 22, second rolling aid roll set; 3, guide speed measuring unit; 31, first guide speed measuring assembly; 32, second guide speed measuring assembly; 4, coiling and drawing unit; 41, first coiling and drawing machine; 42, second coiling and drawing machine; 43, curved surface press roll; 5, thickness gauge; 6, controller; 7, straightening unit. DETAILED DESCRIPTION

[0032] The present application will be further explained below in conjunction with the drawings and specific embodiments so that those skilled in the art can better understand the present application and implement it, but the embodiments presented are not intended to limit the present application.

[0033] Embodiment One

[0034] Referring to Figures 1-3 , a metal strip rolling device of the present application comprises,

[0035] a rolling unit 1, the rolling unit 1 comprising a work roll set 11 and a pressure device 13, the work roll set 11 comprising an upper work roll 111 and a lower work roll 112, the upper work roll 111 and the lower work roll 112 being columnar structures with wavy concave-convex parts on their surfaces, the wavy concave-convex parts of the upper work roll 111 and the lower work roll 112 being symmetrically arranged at their centers, and the convex parts / concave parts of the upper work roll 111 and the concave parts / convex parts of the lower work roll 112 being mutually fitted; the pressure device 13 being used to control the pressing force between the upper work roll 111 and the lower work roll 112, and the pressure device 13 being provided with a pressure sensor 131;

[0036] a rolling aid unit 2, the rolling aid unit 2 comprising a first rolling aid roll set 21 and a second rolling aid roll set 22 arranged respectively on both sides of the rolling unit 1;

[0037] A guide speed measuring unit 3, which comprises a first guide speed measuring assembly 31 and a second guide speed measuring assembly 32 arranged on both sides of the rolling unit 1 respectively;

[0038] A coiling unit 4, which comprises a first coiling machine 41 and a second coiling machine 42, the strip coiled on the first coiling machine 41 passes through the first guide speed measuring assembly 31 and the first supporting roller group 21 in sequence, passes through the two work rollers, and then passes through the second supporting roller group 22 and the second guide speed measuring assembly 32 in sequence to be coiled on the second coiling machine 42;

[0039] A shaping unit 7, which is used for shaping the semi-finished strip on the second coiling machine 42.

[0040] Specifically, the first supporting roller group 21 and the second supporting roller group 22 are both composed of a plurality of curved rollers, which are divided into upper and lower rows, wherein the shape of the curved rollers in the upper row is the same as that of the upper work roller 111, and the shape of the curved rollers in the lower row is the same as that of the lower work roller 112.

[0041] Specifically, the first guide speed measuring assembly 31 and the second guide speed measuring assembly 32 both comprise a guide roller, the shape of which is the same as that of the lower work roller 112, and the end of the guide roller is provided with a speed encoder for measuring the rolling speed.

[0042] Specifically, the upper part of the first coiling machine 41 and the second coiling machine 42 is provided with a curved pressure roller 43 for preventing the strip from whipping, and the shape of the curved pressure roller 43 is the same as that of the upper work roller 111; the motor of each coiling machine is provided with an encoder for speed measurement.

[0043] It can be conceived that the existing rolling device and rolling method are to reduce the roll gap value between the two rollers rotating in opposite directions, so that the metal extends in the longitudinal direction perpendicular to the axial direction of the roller, to realize the thinning of the strip; and the roll surface of the work roller directly contacting the strip and the support roller preventing the work roller from deforming is cylindrical, or only has a very small concave-convex degree corresponding to the elastic deformation generated during rolling, so that the contact surface with the strip remains flat under the rolling load state.

[0044] The metal strip rolling device of the present application sets the upper work roll 111 and the lower work roll 112 as a columnar structure with a wavy concave-convex part on the surface, the wavy concave-convex part makes the linear speed of each point in the axial direction of the upper work roll 111 and the lower work roll 112 different, and can produce lateral shear rubbing of the metal in the process of metal strip rolling, cooperates with the longitudinal rubbing of the metal in the rolling process, so that the metal is "rubbed bidirectionally" in the deformation zone, and the stress state of the metal in the rolling deformation zone is improved; meanwhile, one of the first coiling puller and the second coiling puller acts as a feeding device, and the other acts as a receiving device in the rolling process, the strip is "tensed" by the first coiling puller and the second coiling puller, and the generated coiling pulling force cooperates with the rolling aid unit, further improves the ability of the device to roll high-strength ultra-thin strips, and can minimize the rolling force to produce ultra-thin strips with higher hardness.

[0045] It is also conceivable that the design of the work roll surface can also prevent the problem of slipping between the support roll main drive and the work roll, and to some extent, the surface quality of the strip can be improved.

[0046] Further, the support roll set 12 is further included, the support roll set 12 includes an upper support roll 121 and a lower support roll 122, the wavy surface of the upper support roll 121 closely abuts the surface of the upper work roll 111 for supporting the upper work roll 111, and the wavy surface of the lower support roll 122 closely abuts the surface of the lower work roll 112 for supporting the lower work roll 112. It is conceivable that the upper support roll 121 and the lower support roll 122 are arranged in shapes matched with the concave-convex degrees of the upper work roll 111 and the lower work roll 112 respectively, which can make the roll surface of the support roll and the work roll it supports match, prevent the elastic deformation of the work roll, increase the contact area between the support roll and the work roll, prevent slipping between the work roll and the support roll, and ensure the stable progress of the entire rolling process.

[0047] Specifically, the rolling unit 1 includes a rack, the upper support roll 121, the upper work roll 111, the lower work roll 112 and the lower support roll 122 are sequentially arranged in the rack from top to bottom, and are connected with a main drive device; and a pressure device 13 is further arranged, the pressure device 13 is a hydraulic cylinder or a screwdown motor, and a speed encoder or a hydraulic AGG is arranged on the pressure device 13 to monitor the position of the roll, and the pressure device 13 is further connected with a pressure sensor 131 for real-time measurement of the rolling pressure and the pressing force.

[0048] Specifically, before the metal strip rolling, the pressure device 13 is started, and stopped until the value of the pressure sensor 131 reaches the pressing force design value, at which time the position of the roll is "zero", and the pressing force design value is 10-100 tons.

[0049] Further, the height difference of the concave-convex of the upper work roll 111 and the lower work roll 112 is 0.01mm-5mm.

[0050] Further, the gap between the ends of the upper work roll 111 and the lower work roll 112 is 0.01mm-0.08mm when the middle parts of the upper work roll 111 and the lower work roll 112 are in contact. It is conceivable that the concave-convex of the upper work roll 111 and the lower work roll 112 can be completely matched, and the upper work roll 111 and the lower work roll 112 can also be set to have a gap that gradually increases from the contact position of the middle parts to the ends.

[0051] Further, a thickness gauge 5 for measuring the thickness of the strip is further included, and the thickness gauge 5 is provided with a plurality of symmetrically arranged on both sides of the rolling unit 1.

[0052] Further, the upper work roll 111 can be a convex roll with only one convex part or a concave roll with only one concave part, and the lower work roll 112 can be a concave roll or a convex roll matched with the upper work roll 111. It is conceivable that the upper work roll 111 and the lower work roll 112 can be a columnar structure with a wave-shaped concave-convex part on the surface, and the surface can have a plurality of convex parts and concave parts.

[0053] Further, a controller 6 is further included, and the controller is used to control the rolling unit 1, the auxiliary rolling unit 2 and the coiling pulling unit 4. Specifically, the parts of the entire rolling device can be integrated and linked, and the speed and pressure values of the main motor, the coiling pulling motor and the auxiliary rolling motor can be dynamically adjusted according to the real-time thickness feedback value, the rolling pressure value, the speed value and other unit data, so as to meet the thickness requirements of each pass of the strip; at the same time, the start and stop of the unit can be controlled.

[0054] It is conceivable that before the metal strip is rolled, the initial threading speed and the roll gap value of the first coiling pulling machine 41, the guide roll, the auxiliary rolling unit 2, the work roll group 11 and the second coiling pulling machine 42 of each pass can be input into the controller; the speed model and the roll gap value of the guide roll, the auxiliary rolling unit 2, the work roll group 11 or the support roll group 12 of each pass and the speed model, the initial value of the rolling force of the first coiling pulling machine 41 and the second coiling pulling machine 42 are input into the controller, and dynamic control is performed through the controller.

[0055] A metal strip rolling method, which uses the metal strip rolling device of any one of the above to roll the metal strip, comprising the following steps,

[0056] Step S1: idling, the rolling unit 1 is operated under the predetermined rolling force, the threading roll gap and the threading speed for 5min-20min, wherein the threading roll gap value is 2-12 times the thickness of the strip of the pass to be rolled, the threading speed is 1rpm-5rpm, and the rotating speed of the upper work roll 111 is greater than that of the lower work roll 112;

[0057] Step S2: threading, the first coiler 41 rotates at a threading speed, the strip material pulled thereon is sent into between the upper work roll 111 and the lower work roll 112 in sequence through the first guide speed measuring assembly 31 and the first roll mill 21, and is sent out in sequence through the second roll mill 22 and the second guide speed measuring assembly 32 at the threading speed, and is finally coiled on the second coiler 42, until the strip material is coiled 1-5 turns on the second coiler 42 to complete the threading; it is conceivable that the upper work roll 111 and the lower work roll 112 can be sprayed with process lubricating liquid or lubricating oil before threading, and a blowing device can also be arranged on both sides of the work roll set 11 to further ensure the final quality of the rolled strip material; specifically, the rotating speeds of the two coilers are between 30 rpm and 800 rpm, but the rotating speeds of the two coilers are different in the same pass;

[0058] Step S3: rolling, the pressure value, the roll gap value, the coiling tension value and the running speed of the strip material and other parameters are adjusted to predetermined values, and the values of the parameters are dynamically adjusted according to the comparison between the actually measured thickness data of the thickness gauge and the design value, and the strip material is dynamically rolled; when the strip material on the first coiler 41 remains 2-5 turns, the speed of the strip material is reduced to the threading speed until the strip material is completely coiled on the second coiler 42, the device stops, and the rolling of the strip material in one pass is completed;

[0059] Step S4: the rolling direction of the device is reversed, and steps S1-S3 are repeated to perform the rolling in the next pass until the thickness of the strip material reaches the predetermined thickness, and the rolling of the semi-finished strip material is completed;

[0060] Step S5: the semi-finished strip material is sent to the shaping unit 7 for shaping and edge cutting to produce the finished strip material.

[0061] Specifically, the rolling device further comprises a shaping unit 7, the semi-finished strip coil coiled on the second coiler 42 is shaped and edge cut by the shaping unit 7 to produce the finished strip material, and the minimum thickness of the finished strip material can reach 0.002 mm, and the shaping unit 7 can be a shaper.

[0062] Further, the rotating speeds of the upper work roll 111 and the lower work roll 112 are 20 rpm-900 rpm, and the rotating speed difference between the upper work roll 111 and the lower work roll 112 is 10%-45%. It is conceivable that, since the transverse kneading and asynchronous rolling change the compressive stress state in the deformation zone and increase the shear deformation, compared with conventional rolling, the rolling pressure can be obviously reduced, the deformation amount of each pass can be increased, the rolling passes and the intermediate annealing times can be reduced, the thinning capacity and the rolling efficiency of the rolling mill can be improved.

[0063] Example Two

[0064] Reference Figures 1-3As shown, on the basis of Embodiment One, the upper work roll 111 is set as a concave roll with a concave depth of 2.55 mm, the lower work roll 112 is set as a convex roll with a convex height of 2.6 mm, and when the convex roll and the concave roll are in contact in the middle, the gap between the two ends of the convex roll and the concave roll is 0.05 mm; at the same time, the upper support roll 121 is processed into a convex shape with a convex height of 2.55 mm, and the lower support roll is set as a concave shape with a concave depth of 2.6 mm, so that the concave-convex degrees of the work roll and the support roll matched with each other are matched. The first coil drawing machine reel and the second coil drawing machine reel are made, both of which are set as convex reels with a convex height of 2.55 mm; the curved surface press rolls 43 of the first coil drawing machine and the second coil drawing machine are set as concave shapes with a concave depth of 2.55 mm; the curved surface rolls in the upper row in the roll-aiding unit are set as concave rolls with a concave depth of 2.55 mm, and the curved surface rolls in the lower row are set as convex rolls with a convex height of 2.55 mm; the guide roll is processed into a convex shape with a convexity of 2.55 mm; and the above components are assembled.

[0065] The pressure device 13 is started until the force value displayed by the pressure sensor 131 reaches the design value of the pressing force of 30 tons, at which time the position of the roll is considered as the "zero" position.

[0066] The initial threading speed, the rolling speed, the roll gap value or the pressure value of the first coil drawing machine 41, the guide roll, the work roll set 11 and the second coil drawing machine 42 of each pass are input into the programmable controller.

[0067] The raw material strip coil is loaded into the uncoiler, the strip coil is inverted onto the first coil drawing machine 41 and aligned with the upper work roll 111 / lower work roll 112.

[0068] The start switch on the programmable controller or operator is turned on, and the rolling unit 1 and the coiling unit 4 perform the first pass rolling procedure. That is, the rolling unit 1 runs at the threading speed for 5-20 minutes, and then the first coiler 41 and the second coiler 42 rotate at the threading speed. The head of the raw material strip on the first coiler 41 is manually or mechanically pulled through the first guide speed measuring assembly 31 and the first auxiliary roller assembly 21, and into the space between the upper work roll 111 and the lower work roll 112, and then through the second auxiliary roller assembly 22 and the second guide speed measuring assembly 32 to the second coiler 42, and is wound 1-5 turns on the winding drum of the second coiler 42 to complete the threading. After the threading is completed, the rolling unit 1 and the coiling unit 4 are pressed to the specified roll gap value or pressure value according to the specified speed model, and the thickness gauge 5 is closed-loop controlled to perform stable rolling. When the strip on the winding drum of the first coiler is left with 2-5 turns, the rolling unit 1 and the coiling unit 4 are lowered to the threading speed, the curved surface pressure roller 43 of the two coilers is pressed against the strip until the coiling is completed, the curved surface pressure roller 43 is lifted, and the rolling unit 1 and the coiling unit 4 are stopped, and the pass rolling is completed. Then the next adjacent pass idle, threading and rolling procedure is started manually or automatically until the last pass is completed, and the semi-finished strip coil is produced.

[0069] The semi-finished strip coil is introduced into the shaping machine and the leveler to produce the finished strip coil, and is cut, packaged and produced into the finished strip.

[0070] Obviously, the above-described embodiments are merely examples for the purpose of clear illustration, and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those of ordinary skill in the art. Here, it is not necessary and impossible to exhaust all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A metal strip rolling device, characterized by, Comprising, a rolling unit, the rolling unit comprising a working roller set and a pressure device, the working roller set comprising an upper working roller and a lower working roller, the upper working roller and the lower working roller being columnar structures with wavy concave-convex parts on surfaces, the wavy concave-convex parts of the upper working roller and the lower working roller being symmetrically arranged at centers, and the convex part / concave part of the upper working roller and the concave part / convex part of the lower working roller being mutually fitted; an auxiliary rolling unit, the auxiliary rolling unit comprising a first auxiliary roller set and a second auxiliary roller set arranged on two sides of the rolling unit along a rolling direction respectively; a guide speed measuring unit, the guide speed measuring unit comprising a first guide speed measuring assembly and a second guide speed measuring assembly arranged on two sides of the rolling unit along the rolling direction respectively; a coiling unit, the coiling unit comprising a first coiling machine and a second coiling machine, a strip coiled on the first coiling machine passing through the first guide speed measuring assembly and the first auxiliary roller set in sequence, passing between the two working rollers, and passing through the second auxiliary roller set and the second guide speed measuring assembly in sequence to be coiled on the second coiling machine; a shaping unit, the shaping unit being used for shaping a semi-finished strip on the second coiling machine; a height difference between the concave part and the convex part of the surfaces of the upper working roller and the lower working roller is 0.01mm-5mm; a gap between the end parts of the upper working roller and the lower working roller is 0.01mm-0.08mm when the centers of the upper working roller and the lower working roller are fitted; a metal strip is rolled by the metal strip rolling device, comprising the following steps, step S1: the rolling unit is run empty for a predetermined time length at a predetermined strip passing roller gap and a predetermined strip passing speed, and a rotating speed of the upper working roller is set to be greater than a rotating speed of the lower working roller; step S2: the first coiling machine rotates at the strip passing speed, a strip thereon passes through the first guide speed measuring assembly and the first auxiliary roller set in sequence, enters between the upper working roller and the lower working roller, passes through the second auxiliary roller set and the second guide speed measuring assembly in sequence at the strip passing speed, and is finally coiled on the second coiling machine, until the strip is coiled to a predetermined length on the second coiling machine, and the strip passing is completed; step S3: rolling parameters of the strip are adjusted to predetermined values, the rolling parameters of the strip including a pressure value, a roller gap value, a coiling force value, and a running speed of the strip; thickness data of the strip are detected in real time and compared with design values, values of the parameters are dynamically adjusted, and the strip is dynamically rolled; when the strip on the first coiling machine remains a predetermined length, the speed of the strip is reduced to the strip passing speed, until the strip is completely coiled on the second coiling machine, the device stops, and the strip completes one pass of rolling; step S4: a rolling direction of the device is reversed, steps S1-S3 are repeated, and the next pass of rolling is performed, until a thickness of the strip reaches a predetermined thickness, and rolling of the semi-finished strip is completed; step S5: the semi-finished strip is sent to the shaping unit to be shaped and edged, and a finished strip is manufactured; the rotating speed of the upper working roller and the lower working roller is 20rpm-900rpm, and a rotating speed difference between the upper working roller and the lower working roller is 10%-45%.

2. The metal strip rolling apparatus of claim 1, wherein: The support roller set comprises an upper support roller for supporting the upper work roller and a lower support roller for supporting the lower work roller.

3. The metal strip rolling apparatus of claim 1 wherein: A thickness gauge for measuring the thickness of the strip is further included, and the thickness gauge is provided with a plurality of thickness gauges symmetrically arranged on both sides of the rolling unit.

4. The metal strip rolling apparatus of claim 1 wherein: The upper work roller is a convex roller with only one convex part or a concave roller with only one concave part, and the lower work roller is a concave roller or a convex roller matched with the upper work roller.

5. The metal strip rolling apparatus of claim 1 wherein: A controller is further included for controlling the rolling unit, the auxiliary rolling unit and the coiling and drawing unit.

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