A rolling method of a single stand two continuous rolling mill for metal strip

Abstract

The application discloses a rolling method of a single-stand two-connected rolling mill for metal extremely thin strips, which is completed through a rolling mill mechanical device and a rolling mill control system, and the rolling mill mechanical device comprises, in sequence along a rolling direction of a rolled piece, a winding drum one, a deflector roll one, a thickness gauge one, a housing, a deflector roll four, a loop device, a deflector roll three, a thickness gauge three, the housing, a thickness gauge two, a deflector roll two and a winding drum two, wherein the winding drum one and the winding drum two are located on the same side of the housing. The application takes the speed difference of the rolled piece entering and leaving the loop device, the accumulated length of the loop and the position of the moving loop frame as control signals, controls the linear speed of the fast and slow speed work rolls, matches the flow of the rolled piece at the upper and lower roll gaps, prevents the continuous accumulation or reduction of the rolled piece between the two roll gaps, and realizes stable rolling and target thickness reduction.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of precision metal ultra-thin strip production, and particularly relates to a rolling method of a single-stand two continuous rolling mill for metal ultra-thin strips. BACKGROUND

[0002] In recent years, with the rise of the micro-manufacturing industry, the market demand for micro-materials has rapidly increased. Metal ultra-thin strips, i.e. metal and alloy foils in the form of strips, are widely used in the micro-electronics, aerospace, lithium-ion batteries and robotics industries as a kind of micro-materials. Traditional production methods of metal ultra-thin strips are mostly single-stand rolling mills (multi-roller rolling mills) with multi-pass reversible rolling production. Due to the difficulty in rolling metal ultra-thin strips, there is a small pass reduction rate, which leads to too many rolling passes when the single-stand rolling mill produces metal ultra-thin strips, resulting in low production efficiency and high cost. In order to improve the production efficiency, people have sought a multi-stand continuous rolling scheme, which plans to use five sets of Sendzimir rolling mills arranged longitudinally to continuously roll and produce metal ultra-thin strips. However, this scheme has not been implemented due to its high cost and great technical difficulty. In order to balance efficiency and cost, people have also explored the feasibility of single-stand continuous rolling, built a prototype and conducted experiments. It is found that single-stand continuous rolling can indeed greatly improve production efficiency and has relatively low equipment cost, but there is a problem of flow mismatch at the continuous rolling gap, i.e. the flow rates of all the gaps are not completely equal, which easily leads to the accumulation or reduction of the rolled piece between the mismatched gaps, causing difficulties in tension control and making it impossible to stably roll for a long time. SUMMARY

[0003] The purpose of the present application is to provide a rolling method of a single-stand two continuous rolling mill for metal ultra-thin strips, which can solve the problem of the accumulation or reduction of the rolled piece between the two gaps due to the flow mismatch between the two gaps when the single-stand two continuous rolling mill is used, and realize long-time stable rolling.

[0004] To achieve the above purpose, the present application provides the following technical scheme.

[0005] The rolling method of a single-stand two continuous rolling mill for metal ultra-thin strips disclosed in the present application embodiment is completed by a rolling mill mechanical device and a rolling mill control system,

[0006] The rolling mill mechanical device comprises, in sequence along the rolling direction of the rolled piece, a winding drum one, a deflector roll one, a thickness gauge one, a housing, a deflector roll four, a loop device, a deflector roll three, a thickness gauge three, the housing, a thickness gauge two, a deflector roll two and a winding drum two, the winding drum one and the winding drum two are located on the same side of the housing,

[0007] The housing is internally sequentially fitted from top to bottom with an upper support roll, an upper work roll, a floating work roll, a lower work roll and a lower support roll, the rolled piece is rolled between the upper work roll and the floating work roll, and the rolled piece is rolled between the floating work roll and the lower work roll,

[0008] The frame is provided with a pressing device acting on the upper supporting roller, which in turn drives the upper working roller, the floating working roller, and controls the pressing rolling force of the rolled piece between the upper working roller and the floating working roller and between the floating working roller and the lower working roller,

[0009] It also comprises reversible and individually controlled main motor one, main motor two, coiling motor one and coiling motor two. The main motor one drives the upper working roller through the main speed reducer one and the main speed reducer three, and then through the shaft coupling one. The main motor two drives the lower working roller through the main speed reducer two and the main speed reducer three, and then through the shaft coupling two. The coiling motor one drives the coiling drum one, and the coiling motor two drives the coiling drum two.

[0010] The loop device comprises a loop slide rail, a coiling motor three, a coiling speed reducer three, a coiling drum three, and loop frame one and loop frame two oppositely arranged and forming a certain spacing. The loop frame one is fixedly installed with the loop slide rail, and the loop frame two is installed on the loop slide rail and moves horizontally along the rolling direction of the rolled piece. The loop frame one and the loop frame two are respectively provided with a plurality of loop rollers along the vertical direction. The rolled piece is staggered through the loop rollers on the loop frame one and the loop frame two. One end of the loop tension lead belt is wound around the coiling drum three, and the other end is fixed to the bottom of the loop frame two. The coiling motor three is a reversible motor, which drives the coiling drum three through the coiling speed reducer three, and then controls the horizontal movement of the loop frame two.

[0011] The rolling mill control system comprises a measurement sensor, an industrial computer, a PLC, an operation table, a control cabinet and a frequency converter, the measurement sensor comprises a rolling force sensor for measuring rolling force of the screwdown device, a tension force sensor one, a tension force sensor two and a tension force sensor three for measuring the rolling piece tension, an encoder one and an encoder two for measuring and controlling the rotating speed of the main motor one and the main motor two respectively, an encoder one, an encoder two and an encoder three for measuring and controlling the rotating speed of the winding motor one, the winding motor two and the winding motor three respectively, a rolling speed encoder one, a rolling speed encoder two, a rolling speed encoder three and a rolling speed encoder four for measuring the rolling piece speed, the rolling speed encoder one, the rolling speed encoder two, the rolling speed encoder three and the rolling speed encoder four are respectively installed on one side of the deflector roll one, the deflector roll two, the deflector roll three and the deflector roll four, the tension force sensor one, the tension force sensor two and the tension force sensor three are respectively located below the deflector roll one, the deflector roll two and the deflector roll three, a thickness gauge one, a thickness gauge two and a thickness gauge three are respectively arranged for measuring the thickness of the rolling piece, a proximity switch one and a proximity switch two are respectively installed on both ends of the loop slide rail,

[0012] The rolling method comprises the following steps in sequence:

[0013] S1, setting basic rolling parameters, including maximum loop cumulative speed difference allowable value ΔV max , maximum loop cumulative length allowable value L max , initial rolling force P and rolling piece outlet thickness h of each rolling pass, winding drum one tension F1, winding drum two tension F2 and loop tension F p ;

[0014] S2, threading, winding one end of the rolling piece on the winding drum two, winding the other end of the rolling piece on the winding drum one in sequence through the deflector roll two, the thickness gauge two, the lower roll gap, the thickness gauge three, the deflector roll three, the loop device, the deflector roll four, the upper roll gap, the thickness gauge one and the deflector roll one, when threading in the loop device, moving the loop frame two to the position between the proximity switch one and the proximity switch two, and the rolling piece alternately passes through the loop rollers on the loop frame one and the loop frame two;

[0015] S3, screwdown and tension building, increasing the rolling force to the initial set value P by pressing the lower roll gap screwdown button according to the rolling force value measured by the rolling force sensor in real time, increasing the winding drum one tension, the winding drum two tension and the loop tension to the set values F1, F2 and F p respectively by rotating the three tension adjusting bidirectional self-resetting switches according to the tension values of the rolling piece at the upper and lower roll gaps measured by the three tension force sensors in real time;

[0016] S4 press the loop cumulative length zero button, the loop cumulative length L display becomes 0;

[0017] S5 start the rolling mill, press the acceleration button, the speed of the main motor one and the main motor two increases proportionally, the acceleration button and the deceleration button control the increase and decrease of the speed of the two main motors respectively, and the proportion of the speed of the two main motors remains unchanged, the speed of the two main motors is the same at the initial acceleration, and the linear speed of the upper and lower work rolls is the same;

[0018] S6 adjust the roll gap pressing button and the roll gap lifting button, so that the exit thickness value of the rolled piece after two passes of single stand rolling reaches the set value h;

[0019] S7 real-time measurement and calculation of loop cumulative speed difference ΔV, loop cumulative speed difference ΔV is calculated in real time by formula ΔV = |V3-V4|, wherein the rolled piece speed V3 at the left side of the lower roll gap is measured and calculated by measuring speed encoder three, and the rolled piece speed V4 at the left side of the upper roll gap is measured and calculated by measuring speed encoder four;

[0020] S8 real-time comparison of loop cumulative speed difference ΔV and maximum loop cumulative speed difference allowable value ΔV max , adjust the speed of the fast roller main motor, taking the rolling direction of the rolled piece at the upper roll gap as the reference, when rolling to the right, the upper work roll is the fast roller, the main motor one is the fast roller main motor, and the main motor two is the slow roller main motor; when rolling to the left, the lower work roll is the fast roller, the main motor two is the fast roller main motor, and the main motor one is the slow roller main motor;

[0021] When rolling to the right, if ΔV > ΔV max and V3 > V4, increase the speed of the main motor one; if ΔV > ΔV max and V3 < V4, decrease the speed of the main motor one,

[0022] When rolling to the left, if ΔV > ΔV max and V3 > V4, decrease the speed of the main motor two; if ΔV > ΔV max and V3 < V4, increase the speed of the main motor two,

[0023] When ΔV ≤ ΔV max , do not adjust the speed of the fast roller main motor;

[0024] S9 real-time calculation of loop cumulative length L, when rolling to the right, loop cumulative length L is calculated in real time by formula L = ∫(V3-V4)dt, wherein t is the cumulative time; when rolling to the left, the calculation formula of loop cumulative length L is L = ∫(V4-V d )dt, the loop cumulative length L can be positive or negative in value, when L > 0, it indicates that the loop frame two moves to the left and approaches proximity switch two; when L < 0, it indicates that the loop frame two moves to the right and approaches proximity switch one;

[0025] S10 real-time comparison of the loop cumulative length L and the maximum loop cumulative length allowable value L max , the speed of the fast roller main motor is adjusted,

[0026] When rolling to the right, if |L|>L max and L>0, the speed of the main motor one is increased until V3 max and L<0, the speed of the main motor one is decreased until V3

[0027] When rolling to the left, if |L|>L max and L>0, the speed of the main motor two is increased until V3 max and L<0, the speed of the main motor two is decreased until V3

[0028] When |L|≤L max , the speed of the fast roller main motor is not adjusted.

[0029] S11 real-time monitoring of the signal change of the proximity switch one and the proximity switch two, the speed of the slow roller main motor is adjusted,

[0030] When rolling to the right, if the loop support two moves to the left to the sensing area of the proximity switch two, the signal of the proximity switch two is set to 1, the far end indicator light of the loop is on, the speed of the main motor two is decreased until V3

[0031] When rolling to the left, if the loop support two moves to the left to the sensing area of the proximity switch two, the signal of the proximity switch two is set to 1, the far end indicator light of the loop is on, the speed of the main motor one is decreased until V3

[0032] When the loop support two moves between the sensing areas of the proximity switch one and the proximity switch two, the speed of the slow roller main motor is not adjusted.

[0033] S12 repeat steps S6 to S11 until the rolled piece is thinned to the target thickness.

[0034] Preferably, in the rolling method of the above-mentioned single-stand two-continuous rolling mill of metal extremely thin strips, the power output shaft of the coiling motor one is connected to the power input shaft of the coiling speed reducer one, the power output shaft of the coiling speed reducer one drives the coiling drum one, the power output shaft of the coiling motor two is connected to the power input shaft of the coiling speed reducer two, and the power output shaft of the coiling speed reducer two drives the coiling drum two.

[0035] Preferably, in the rolling method of the single-stand two-high rolling mill for metal ultra-thin strip as described above, the top of the first deflection roller, the top of the floating work roller and the bottom of the fourth deflection roller are located on the same horizontal line, and the top of the second deflection roller, the top of the third deflection roller and the bottom of the floating work roller are located on the same horizontal line.

[0036] Preferably, in the rolling method of the single-stand two-high rolling mill for metal ultra-thin strip as described above, the first deflection roller, the second deflection roller, the third deflection roller and the fourth deflection roller are all hollow rollers and are all passive rollers, and are all driven by the frictional force applied by the rolled piece.

[0037] Preferably, in the rolling method of the single-stand two-high rolling mill for metal ultra-thin strip as described above, the screwdown device comprises a screwdown motor and a screwdown worm and gear reducer, the worm of the screwdown worm and gear reducer is a screwdown screw, the screwdown motor drives the screwdown worm and gear reducer to control the up-and-down movement of the screwdown screw, thereby controlling the magnitude of the screwdown rolling force, and the rolling force sensor is located below the screwdown screw.

[0038] Preferably, in the rolling method of the single-stand two-high rolling mill for metal ultra-thin strip as described above, the main motor one and the main motor two are respectively provided with a main motor speed sensor one and a main motor speed sensor two, and the coiling motor one, the coiling motor two and the coiling motor three are respectively provided with a coiling motor speed sensor one, a coiling motor speed sensor two and a coiling motor speed sensor three.

[0039] Preferably, in the rolling method of the single-stand two-high rolling mill for metal ultra-thin strip as described above, the industrial computer is provided with a WinCC configuration control system man-machine interface, and the man-machine interface is provided with a maximum loop cumulative speed difference allowable value ΔV max input field, maximum loop cumulative length allowable value L max input field, initial rolling force P input field, PID parameter input field, rolled piece outlet thickness h output field, coiling drum one tension F1 input field, coiling drum two tension F2 input field and loop tension F p input field, upper roll gap left side rolled piece speed V4 output field, lower roll gap left side rolled piece speed V3 output field, loop cumulative speed difference ΔV output field, loop cumulative length L output field, upper roll gap right side rolled piece thickness h1 output field, lower roll gap right side rolled piece thickness h2 output field and lower roll gap left side rolled piece thickness h3 output field.

[0040] Preferably, in the rolling method of the single-stand two-continuous-rolling mill of the metal extremely thin strip above, the operation table has a loop cumulative length zero button, a rolling direction adjustment bidirectional switch, a reel one tension adjustment bidirectional self-resetting switch, a reel two tension adjustment bidirectional self-resetting switch, a loop tension adjustment bidirectional self-resetting switch, a roll gap pressing button, a roll gap lifting button, an acceleration button, a deceleration button, a loop far end indicator lamp and a loop near end indicator lamp.

[0041] Preferably, in the rolling method of the single-stand two-continuous-rolling mill of the metal extremely thin strip above, the frequency converter is located in the control cabinet and is composed of a rectifier unit, a DC bus and five independent inverters, which respectively drive the main motor one, the main motor two, the coiling motor one, the coiling motor two and the coiling motor three.

[0042] Compared with the prior art, the single-stand two-continuous-rolling mill of the metal extremely thin strip has the advantages that the single-stand two-continuous-rolling is realized by adopting a 5-roll longitudinal configuration, the loop device is introduced, and the speed difference of the rolled piece entering and leaving the loop device, the loop cumulative length and the position of the moving loop frame are used as control signals to control the linear speed of the fast and slow speed work rolls, so that the flow of the rolled piece at the upper and lower roll gaps is matched, the continuous accumulation or reduction of the rolled piece between the two roll gaps is prevented, and stable rolling is realized. The single-stand rolling mill of the present application has fewer rolling passes, higher production efficiency, lower product cost, lower equipment cost and smaller technical difficulty than the multi-stand continuous rolling mill. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0044] Figure 1 The figure shows a schematic diagram of the rolling mill mechanical device in the specific embodiment of the present application;

[0045] Figure 2 The figure shows a front view of the rolling mill mechanical device in the specific embodiment of the present application;

[0046] Figure 3 The figure shows a top view of the rolling mill mechanical device in the specific embodiment of the present application;

[0047] Figure 4 The figure shows a schematic diagram of the pressing device in the specific embodiment of the present application.

[0048] Fig. 1, 1, industrial computer; 2, operation table; 3, PLC; 4, control cabinet; 5, rolling mill mechanical device; 6, reel one; 7, reel two; 8, tension force sensor one for tension measurement; 9, deflector roll one; 10, thickness gauge one; 11, tension force sensor two for tension measurement; 12, deflector roll two; 13, thickness gauge two; 14, lower support roll; 15, lower work roll; 16, floating work roll; 17, upper support roll; 18, upper work roll; 19, thickness gauge three; 20, deflector roll four; 21, deflector roll three; 22, tension force sensor three for tension measurement; 23, loop support frame one; 24, rolled piece; 25, proximity switch one; 26, loop support frame two; 27, loop roll; 28, loop slide rail; 29, proximity switch two; 30, deflector roll five; 31, loop tension lead belt; 32, reel three; 33, coiling speed reducer one; 34, coiling motor one; 35, encoder one for coiling motor speed measurement; 36, coiling speed reducer two; 37, coiling motor two; 38, encoder two for coiling motor speed measurement; 39, encoder one for rolling speed measurement; 40, encoder two for rolling speed measurement; 41, main speed reducer three; 42, main speed reducer one; 43, main motor one; 44, encoder one for main motor speed measurement; 45, main speed reducer two; 46, encoder two for main motor speed measurement; 47, main motor two; 48, encoder four for rolling speed measurement; 49, encoder three for rolling speed measurement; 50, coiling speed reducer three; 51, coiling motor three; 52, encoder three for coiling motor speed measurement; 53, force sensor for rolling force measurement; 54, screwdown device; 55, screwdown motor; 56, screwdown worm and gear speed reducer; 57, screwdown screw; 58, coupling one; 59, coupling two. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0050] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] In combination Figures 1-4 As shown in the figure, the rolling method of the single-stand two-continuous rolling mill of the metal ultra-thin strip is completed by the rolling mill mechanical device 5 and the rolling mill control system,

[0053] The rolling mill mechanical device 5 includes, in sequence along the rolling direction of the rolled piece 24, a reel one 6, a deflector roll one 9, a thickness gauge one 10, a housing, a deflector roll four 20, a looper device, a deflector roll three 21, a thickness gauge three 19, a housing, a thickness gauge two 13, a deflector roll two 12, a reel two 7, the reel one 6 and the reel two 7 are located on the same side of the housing,

[0054] The housing is sequentially assembled from top to bottom with an upper backup roll 17, an upper work roll 18, a floating work roll 16, a lower work roll 15 and a lower backup roll 14, the rolled piece 24 is rolled between the upper work roll 18 and the floating work roll 16, and the rolled piece 24 is rolled between the floating work roll 16 and the lower work roll 15,

[0055] The housing is sequentially assembled from top to bottom with an upper backup roll 17, an upper work roll 18, a floating work roll 16, a lower work roll 15 and a lower backup roll 14, the rolled piece 24 is rolled between the upper work roll 18 and the floating work roll 16, and the rolled piece 24 is rolled between the floating work roll 16 and the lower work roll 15,

[0056] It also includes reversible and individually controlled main motor one 43, main motor two 47, coiling motor one 34, coiling motor two 37, the main motor one 43 is driven through the upper work roll 18 by the shaft coupling one 58 after being decelerated by the main speed reducer one 42 and the main speed reducer three 41 in sequence, the main motor two 47 is driven through the lower work roll 15 by the shaft coupling two 59 after being decelerated by the main speed reducer two 45 and the main speed reducer three 41 in sequence, the coiling motor one 34 drives the reel one 6, and the coiling motor two 37 drives the reel two 7,

[0057] The loop device comprises a loop slide rail 28, a winding motor three 51, a winding speed reducer three 50, a winding drum three 32, a loop frame one 23 and a loop frame two 26 oppositely arranged and forming a certain spacing, the loop frame one is fixedly installed with the loop slide rail 28, the loop frame two 26 is installed on the loop slide rail 28 and moves horizontally along the rolling direction of the rolled piece 24, the loop frame one 23 and the loop frame two 26 are respectively provided with a plurality of loop rollers 27 along the vertical direction, the rolled piece 24 is staggered through the loop rollers 27 on the loop frame one 23 and the loop frame two 26, one end of a loop tension lead belt 31 is wound on the winding drum three 32, the other end of the loop tension lead belt 31 is fixed to the bottom of the loop frame two 26, the bottom of the loop tension lead belt 31 is provided with a deflection roller five 30, the winding motor three 51 is a reversible motor, the winding motor three 51 drives the winding drum three 32 through the winding speed reducer three 50, and then controls the horizontal movement of the loop frame two 26,

[0058] The rolling mill control system comprises a measurement sensor, an industrial computer 1, a PLC 3, an operation table 2, a control cabinet 4 and a frequency converter. The measurement sensor comprises a rolling force sensor 53 for measuring the rolling force of the press-down device 54, a tension force sensor one 8, a tension force sensor two 11 and a tension force sensor three 22 for measuring the tension of the rolled piece 24, an encoder one 44 and an encoder two 46 for measuring and controlling the rotating speed of the main motor one 43 and the main motor two 47 respectively, an encoder one 35, an encoder two 38 and an encoder three 52 for measuring and controlling the rotating speed of the winding motor one 34, the winding motor two 37 and the winding motor three 51 respectively, a rolling speed encoder one 39, a rolling speed encoder two 40, a rolling speed encoder three 49 and a rolling speed encoder four 48 for measuring the speed of the rolled piece 24, wherein the rolling speed encoder one 39, the rolling speed encoder two 40, the rolling speed encoder three 49 and the rolling speed encoder four 48 are respectively installed on one side of the deflection roll one 9, the deflection roll two 12, the deflection roll three 21 and the deflection roll four 20, the tension force sensor one 8, the tension force sensor two 11 and the tension force sensor three 22 are respectively located below the deflection roll one 9, the deflection roll two 12 and the deflection roll three 21, a thickness gauge one 10, a thickness gauge two 13 and a thickness gauge three 19 measure the thickness of the rolled piece 24 respectively, and the system further comprises a proximity switch one 25 and a proximity switch two 29 installed on both ends of the loop sliding rail 28, the power output shaft of the winding motor one 34 is connected to the power input shaft of the winding speed reducer one 33, the power output shaft of the winding speed reducer one 33 drives the winding drum one 6, the power output shaft of the winding motor two 37 is connected to the power input shaft of the winding speed reducer two 36, and the power output shaft of the winding speed reducer two 36 drives the winding drum two 7. The top of the deflection roll one 9, the top of the floating work roll 16 and the bottom of the deflection roll four 20 are located on the same horizontal line, the top of the deflection roll two 12, the top of the deflection roll three 21 and the bottom of the floating work roll 16 are located on the same horizontal line. The deflection roll one 9, the deflection roll two 12, the deflection roll three 21 and the deflection roll four 20 are all hollow rolls and passive rolls, and are all dragged by the friction force applied by the rolled piece 24.

[0059] The press-down device 54 comprises a press-down motor 55 and a press-down worm and gear speed reducer 56, the worm of the press-down worm and gear speed reducer 56 is a press-down lead screw 57, the press-down motor 55 drives the press-down worm and gear speed reducer 56 to control the up and down of the press-down lead screw 57, thereby controlling the size of the rolling force, and the rolling force sensor 53 is located below the press-down lead screw 57.

[0060] The encoder one 44 and the encoder two 46 for measuring the rotating speed of the main motor are respectively located on the rotor shaft of the main motor one 43 and the main motor two 47, and the encoder one 35, the encoder two 38 and the encoder three 52 for measuring the rotating speed of the winding motor are respectively located on the rotor shaft of the winding motor one 34, the winding motor two 37 and the winding motor three 51.

[0061] The operation platform 2 is provided with a loop cumulative length zero button, a rolling direction adjusting bidirectional switch, a winding drum one 6 tension adjusting bidirectional self-resetting switch, a winding drum two 7 tension adjusting bidirectional self-resetting switch, a loop tension adjusting bidirectional self-resetting switch, a roll gap pressing button, a roll gap lifting button, an acceleration button, a deceleration button, a loop far end indicator lamp and a loop near end indicator lamp.

[0062] The frequency converter is located in the control cabinet 4 and is composed of a rectifying unit, a DC bus and five independent inverters, which respectively drive the main motor one 43, the main motor two 47, the winding motor one 34, the winding motor two 37 and the winding motor three 51.

[0063] The industrial computer is provided with a WinCC configuration control system man-machine interface, and the man-machine interface is provided with a maximum loop cumulative speed difference allowable value ΔV max input field, a maximum loop cumulative length allowable value L max input field, an initial rolling force P input field, a PID parameter input field, a rolling piece outlet thickness h output field, a winding drum one tension F1 input field, a winding drum two tension F2 input field and a loop tension F p input field, an upper roll gap left side rolling piece speed V4 output field, a lower roll gap left side rolling piece speed V3 output field, a loop cumulative speed difference ΔV output field, a loop cumulative length L output field, an upper roll gap right side rolling piece thickness h1 output field, a lower roll gap right side rolling piece thickness h2 output field and a lower roll gap left side rolling piece thickness h3 output field.

[0064] When the rolling piece is selected to be 430 stainless steel, the initial thickness is 100 μm, the width is 100.0 mm, and the target thickness is 40 μm. The specific implementation steps are as follows:

[0065] Step one: set the following basic rolling parameters, a maximum loop cumulative speed difference allowable value ΔV max = 1.0 m / min, a maximum loop cumulative length allowable value L max = 10 m, an initial rolling force P = 40 t and two rolling piece outlet thicknesses h = 60 μm, 40 μm and three tension values;

[0066] Step two: threading. First, move the loop holder to the middle of proximity switch one and proximity switch two, then wrap one end of the 430 stainless steel strip around reel two, and then pass the other end of the rolled piece through deflector roller two, thickness gauge two, lower roll gap, thickness gauge three, deflector roller three, loop holder, deflector roller four, upper roll gap, thickness gauge one and deflector roller one, and finally wrap it around reel one;

[0067] Step three: press down and build tension. Refer to the rolling force value measured by the force sensor in real time, press down the roll gap button to increase the rolling force to the initial set value P=40t. Refer to the real-time measurement value of the three tension force sensors, rotate the three tension adjustment bidirectional self-resetting switches to increase the three tensions to their set values;

[0068] Step four: press the loop holder cumulative length zero button, at this time the loop holder cumulative length L=0;

[0069] Step five: pull the rolling direction adjustment bidirectional switch to the right to roll, start the rolling mill, press the acceleration button, and the rotation speed of the main motor one and the main motor two increases at the same rate, at this time the main motor one is the fast roller motor and the main motor two is the slow roller motor;

[0070] Step six: adjust the roll gap press down button and the roll gap lift button to make the outlet thickness value of the rolled piece after single stand two-pass rolling reach its set value h=60μm;

[0071] Step seven: measure the rolling speed encoder three to measure the rolling speed V3 of the left side of the lower roll gap, and measure the rolling speed encoder four to measure the rolling speed V4 of the left side of the upper roll gap, and then calculate the loop holder cumulative speed difference ΔV in real time by the formula ΔV=|V3-V4|;

[0072] Step eight: compare the loop holder cumulative speed difference ΔV and the maximum loop holder cumulative speed difference allowable value ΔV max =1.0m / min, and adjust the rotation speed of the fast roller main motor. When ΔV>1.0m / min and V3>V4, increase the rotation speed of the main motor one; if ΔV>1.0m / min and V3V4, decrease the rotation speed of the main motor one, so that the loop holder cumulative speed difference ΔV is always less than or equal to the maximum allowable value, i.e. ΔV≤1.0m / min;

[0073] Step nine: measure the rolling speed encoder three to measure the rolling speed V3 of the left side of the lower roll gap, and measure the rolling speed encoder four to measure the rolling speed V4 of the left side of the upper roll gap, and then calculate the loop holder cumulative length L in real time by the formula L=∫(V3-V4)dt;

[0074] Step ten: compare the loop holder cumulative length L and the maximum loop holder cumulative length allowable value L max= 10m, adjust the speed of the fast roller motor. When |L| > 10m and L > 0, increase the speed of the motor until V3 < V4; when |L| > 10m and L < 0, decrease the speed of the motor until V3 > V4, so that the cumulative length L of the loop is always less than or equal to the maximum allowable value, i.e. L ≤ 10m;

[0075] Step eleven: real-time monitoring of the position of the second loop frame and the signal change of the two proximity switches, adjusting the speed of the slow roller motor. When the proximity switch two signal is 1, decrease the speed of the motor two until V3 < V4; when the proximity switch one signal is 1, increase the speed of the motor two until V3 > V4, so that the second loop frame always moves between the sensing area of the proximity switch one and the proximity switch two;

[0076] Step twelve: pull the rolling direction adjustment bidirectional switch to left rolling, press the acceleration button, adjust the roll gap pressing button and roll gap lifting button, so that the thickness value of the rolled piece after single stand two-pass rolling reaches the set value h = 40μm. During rolling, the rolling mill adopts the following operation:

[0077] 1) Real-time measurement of the speed of the rolled piece at the left side of the lower roll gap by the speed encoder three, and real-time measurement of the speed of the rolled piece at the left side of the upper roll gap by the speed encoder four, and real-time calculation of the cumulative speed difference ΔV of the loop by the formula ΔV = |V3-V4|;

[0078] 2) Real-time comparison of the cumulative speed difference ΔV of the loop and the maximum allowable value ΔV max = 1.0m / min, adjust the speed of the fast roller motor. When ΔV > 1.0m / min and V3 > V4, decrease the speed of the motor two; if ΔV > 1.0m / min and V3 < V4, increase the speed of the motor two, so that the cumulative speed difference ΔV of the loop is always less than or equal to the maximum allowable value, i.e. ΔV ≤ 1.0m / min;

[0079] 3) Real-time measurement of the speed of the rolled piece at the left side of the lower roll gap by the speed encoder three, and real-time measurement of the speed of the rolled piece at the left side of the upper roll gap by the speed encoder four, and real-time calculation of the cumulative length L of the loop by the formula L = ∫(V4-V3)dt;

[0080] 4) Real-time comparison of the cumulative length L of the loop and the maximum allowable value L max = 10m, adjust the speed of the fast roller motor. When |L| > 10m and L > 0, increase the speed of the motor two until V3 > V4; when |L| > 10m and L < 0, decrease the speed of the motor two until V3 < V4, so that the cumulative length L of the loop is always less than or equal to the maximum allowable value, i.e. L ≤ 10m;

[0081] 5) Real-time monitoring of the second sleeve frame position and two proximity switch signal changes, adjust the speed of the slow roller main motor. When the proximity switch two signal is 1, then reduce the main motor speed until V3 > V4; When the proximity switch one signal is 1, then increase the main motor speed until V3 < V4, so that the sleeve frame always moves between the proximity switch one and proximity switch two sensing area.

[0082] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0083] The above description is merely one specific implementation of the application. It is to be understood that, in the interest of expediency and clear presentation, not every implementation detail of the application can be described in a single specification. Those skilled in the art will readily appreciate that many modifications and adaptations of the application different from those discussed above are possible without departing from the underlying underlying principles of the application.

Claims

1. A rolling method of a metal strip in a single stand two-high tandem rolling mill, characterized by, The rolling mill mechanical device and the rolling mill control system are used to complete the rolling, The rolling mill mechanical device comprises, in sequence along the rolling direction of the rolled piece, a winding drum one, a deflector roll one, a thickness gauge one, a housing, a deflector roll four, a looper device, a deflector roll three, a thickness gauge three, the housing, a thickness gauge two, a deflector roll two, and a winding drum two, wherein the winding drum one and the winding drum two are located on the same side of the housing, The housing is sequentially fitted from top to bottom with an upper support roll, an upper work roll, a floating work roll, a lower work roll, and a lower support roll, wherein the rolled piece is rolled between the upper work roll and the floating work roll, and between the floating work roll and the lower work roll, The housing is provided with a screwdown device, which acts on the upper support roll, and in turn drives the upper work roll and the floating work roll, and controls the screwdown rolling force of the rolled piece between the upper work roll and the floating work roll and between the floating work roll and the lower work roll, The rolling mill further comprises reversibly and individually controlled main motors one and two, winding motors one and two, wherein the main motor one is sequentially reduced in speed by main speed reducers one and three, and drives the upper work roll through a coupling one, the main motor two is sequentially reduced in speed by main speed reducers two and three, and drives the lower work roll through a coupling two, the winding motor one drives the winding drum one, and the winding motor two drives the winding drum two, The looper device comprises a looper slide rail, a winding motor three, a winding speed reducer three, a winding drum three, oppositely arranged looper supports one and two with a certain spacing therebetween, wherein the looper support one is fixedly installed with the looper slide rail, the looper support two is installed on the looper slide rail to horizontally reciprocate along the rolling direction of the rolled piece, the looper supports one and two are respectively provided with a plurality of looper rolls along the vertical direction, the rolled piece is staggered through the looper rolls on the looper supports one and two, one end of a looper tension lead belt is wound around the winding drum three, the other end of the looper tension lead belt is fixed to the bottom of the looper support two, the winding motor three is a reversible motor, the winding motor three drives the winding drum three through the winding speed reducer three, and in turn controls the horizontal movement of the looper support two, The rolling mill control system comprises a measurement sensor, an industrial computer, a PLC, an operation table, a control cabinet and a frequency converter, the measurement sensor comprises a rolling force sensor for measuring the rolling force of the screwdown device, a tension force sensor one and a tension force sensor two and a tension force sensor three for measuring the tension of the rolled piece, an encoder one and an encoder two for measuring and controlling the rotating speed of the main motor one and the main motor two respectively, an encoder one and an encoder two and an encoder three for measuring and controlling the rotating speed of the winding motor one and the winding motor two and the winding motor three respectively, a rolling speed encoder one, a rolling speed encoder two, a rolling speed encoder three and a rolling speed encoder four for measuring the rolling speed of the rolled piece, the rolling speed encoder one, the rolling speed encoder two, the rolling speed encoder three and the rolling speed encoder four are respectively installed on one side of the deflector roll one, the deflector roll two, the deflector roll three and the deflector roll four, the tension force sensor one, the tension force sensor two and the tension force sensor three are respectively located below the deflector roll one, the deflector roll two and the deflector roll three, a thickness gauge one, a thickness gauge two and a thickness gauge three are respectively arranged to measure the thickness of the rolled piece, and a proximity switch one and a proximity switch two are respectively installed on both ends of the loop sliding rail, The rolling method comprises the following steps in sequence: S1 set basic rolling parameters, including maximum cumulative speed difference allowance of looper , maximum cumulative length allowance of looper , initial rolling force and exit thickness of rolled piece of each rolling pass , reel one tension , reel two tension and looper tension ; S2 threading, winding one end of the rolled piece on the winding drum two, threading the other end of the rolled piece through the deflector roll two, the thickness gauge two, the lower roll gap, the thickness gauge three, the deflector roll three, the loop device, the deflector roll four, the upper roll gap, the thickness gauge one and the deflector roll one in sequence, and finally winding on the winding drum one, when threading in the loop device, moving the loop frame two to a position between the proximity switch one and the proximity switch two, and the rolled piece alternately passes through the loop rollers on the loop frame one and the loop frame two; S3 press down and build tension, reference to the rolling force measured by force sensor in real time, press down the roll gap button to increase the rolling force to the initial set value , reference to the tension value of the left and right rolled piece at the upper and lower roll gap measured by 3 tension force sensors in real time, rotate 3 tension adjusting bidirectional self-resetting switches to increase the reel one tension, reel two tension and loop tension to their respective set values 、 and ; S4 press the looper accumulated length clear button, the looper accumulated length the display changes to 0; S5 starting the rolling mill, pressing the acceleration button, and the rotating speed of the main motor one and the main motor two increases at a constant ratio, the acceleration button and the deceleration button control the increase and decrease of the rotating speed of the two main motors respectively, and the rotating speed ratio remains unchanged, the rotating speed of the two main motors is the same at the initial acceleration, and the linear speed of the upper and lower work rolls is the same; S6 adjusts the roll gap press-down button and roll gap lift-up button to make the exit thickness value of the single stand two-pass rolled piece reach its set value ; S7 measures and calculates the accumulated speed difference of the loop in real time , the accumulated speed difference of the loop is calculated in real time by the formula , wherein the speed of the rolled piece at the left side of the lower roll gap is calculated by the three measurements of the rolled speed encoder, and the speed of the rolled piece at the left side of the upper roll gap is calculated by the four measurements of the rolled speed encoder S8 real-time comparison of loop cumulative speed difference and maximum loop cumulative speed difference allowable value , the speed of the fast roller main motor is adjusted, and the movement direction of the roller gap is taken as the reference. When rolling to the right, the upper working roller is the fast roller, the main motor one is the fast roller main motor, and the main motor two is the slow roller main motor. When rolling to the left, the lower working roller is the fast roller, the main motor two is the fast roller main motor, and the main motor one is the slow roller main motor. When right-ward rolling, if and then increase the rotation speed of the main motor; if and then decrease the rotation speed of the main motor, When rolling leftward, if and then reduce the second rotation speed of the main motor; if and then increase the second rotation speed of the main motor, When the fast roller main motor speed is not adjusted; S9 real-time calculation of loop cumulative length , right rolling, loop cumulative length calculated by formula , in which is cumulative time; left rolling, loop cumulative length is calculated by formula , loop cumulative length may be positive or negative in value, when , it indicates that loop frame two moves left and approaches proximity switch two; when , it indicates that loop frame two moves right and approaches proximity switch one; S10 real-time comparison of loop cumulative length and maximum loop cumulative length allowance value , adjust the speed of the fast roller main motor, If, when rolling to the right, and the speed of the main motor is increased until ; if and the speed of the main motor is decreased until , When rolling leftward, if and , then increase the second rotation speed of the main motor until ; if and , then decrease the second rotation speed of the main motor until , When the fast roller main motor speed is not adjusted; S11 real-time monitoring the signal change of the proximity switch one and the proximity switch two, and adjusting the rotating speed of the slow roller main motor, When right-rolling, if the loop holder moves to the sensing area of proximity switch 2 and the signal of proximity switch 2 is 1, the far-end indicator of the loop holder is on, then the rotating speed of main motor 2 is decreased until When right-rolling, if the loop holder moves to the sensing area of proximity switch 2 and the signal of proximity switch 2 is 1, the far-end indicator of the loop holder is on, then the rotating speed of main motor 2 is decreased until ​ When the leftward rolling is performed, if the loop frame 2 moves to the sensing area of the proximity switch 2 and the proximity switch 2 sends a signal of 1, the loop far end indicator light is on, and then the rotating speed of the main motor 1 is reduced until When the loop frame 2 moves to the sensing area of the proximity switch 1 and the proximity switch 1 sends a signal of 1, the loop near end indicator light is on, and then the rotating speed of the main motor 1 is increased until ​ When the loop frame two moves between the sensing areas of the proximity switch one and the proximity switch two, the rotating speed of the slow roller main motor is not adjusted; S12 repeating steps S6 to S11 until the rolled piece is thinned to the target thickness, The industrial computer is equipped with a control system man-machine interface configured with WinCC, and the maximum accumulated loop speed difference allowable value is on the man-machine interface Input field, maximum accumulated loop length allowable value Input field, initial rolling force Input field, PID parameter input field, workpiece outlet thickness of each rolling pass Output field, reel one tension Input field, reel two tension Input field and loop tension Input field, workpiece speed on the left side of the upper roll gap Output field, workpiece speed on the left side of the lower roll gap Output field, accumulated loop speed difference Output field, accumulated loop length Output field, workpiece thickness on the right side of the upper roll gap Output field, workpiece thickness on the right side of the lower roll gap Output field and workpiece thickness on the left side of the lower roll gap Output field.

2. The method of claim 1, wherein the metal strip is a metal ultra- thin strip, and the method is a method of rolling a metal ultra-thin strip single-stand two-continuous-rolling mill, characterized in that, The power output shaft of the winding motor one is connected to the power input shaft of the winding speed reducer one, the power output shaft of the winding speed reducer one drives the winding drum one, the power output shaft of the winding motor two is connected to the power input shaft of the winding speed reducer two, and the power output shaft of the winding speed reducer two drives the winding drum two.

3. The method of claim 1, wherein the metal strip is a metal ultra- thin strip, and the method is a method of rolling a metal ultra-thin strip single-stand two-high tandem rolling mill, characterized in that, The top point of the deflector roll one, the top point of the floating work roll and the bottom point of the deflector roll four are located on the same horizontal line, and the top point of the deflector roll two, the top point of the deflector roll three and the bottom point of the floating work roll are located on the same horizontal line.

4. The rolling method for ultra-thin metal strip on a single-stand two-stand rolling mill according to claim 1, characterized in that, The turning roller one, the turning roller two, the turning roller three and the turning roller four are hollow rollers and passive rollers, and are dragged by the friction force applied by the rolled piece.

5. The rolling method for ultra-thin metal strip on a single-stand two-stand rolling mill according to claim 1, characterized in that, The pressing device comprises a pressing motor and a pressing worm and gear reducer, the worm of the pressing worm and gear reducer is a pressing screw, the pressing motor drives the pressing worm and gear reducer, controls the up and down of the pressing screw, and further controls the size of the pressing rolling force, and the rolling force sensor is located below the pressing screw.

6. The method of claim 1, wherein the metal strip is a metal ultra- thin strip. The main motor speed measuring encoder one and the main motor speed measuring encoder two are respectively located on the rotor shafts of the main motor one and the main motor two, and the coiling motor speed measuring encoder one, the coiling motor speed measuring encoder two and the coiling motor speed measuring encoder three are respectively located on the rotor shafts of the coiling motor one, the coiling motor two and the coiling motor three.

7. The method of claim 1, wherein the metal strip is a metal ultra- thin strip. The operation table is provided with a loop cumulative length clear button, a rolling direction adjusting bidirectional switch, a reel one tension adjusting bidirectional self-resetting switch, a reel two tension adjusting bidirectional self-resetting switch, a loop tension adjusting bidirectional self-resetting switch, a roll gap pressing button, a roll gap lifting button, an acceleration button, a deceleration button, a loop far end indicator lamp and a loop near end indicator lamp.

8. The rolling method for ultra-thin metal strip on a single-stand two-stand rolling mill according to claim 1, characterized in that, The frequency converter is located in the control cabinet and comprises a rectifying unit, a DC bus and five independent inverters, and drives the main motor one, the main motor two, the coiling motor one, the coiling motor two and the coiling motor three respectively.

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