A transverse partition independent control electroplastic rolling method

Abstract

The application provides a transverse partition independent control electric plastic rolling method, and clearly defines the regulation and control logic and method of the transverse partition electric plastic flatness control means with the strip flatness defect position temperature as a control target. The position of the conductive copper ring in each electric plastic flatness control roller system is determined according to the flatness defect position, an electric circuit is formed by the two groups of electric plastic flatness control roller systems and the strip through a control circuit, and the electric plastic adjustment along the transverse partition of the strip is realized. In addition, the change amount of the plastic deformation resistance of the strip is determined based on the influence matrix method, and the local strip temperature after the regulation and control of the electric plastic flatness control roller system as the flatness control means is determined in combination with the deformation resistance-temperature rheological curve relationship of the strip, so that the on-line regulation and control of the temperature in the width direction of the strip at the entrance of the deformation zone is realized through the electric plastic flatness control roller system. The electric plastic flatness control roller system provides a more powerful flatness control means for the rolling of the extremely thin, extremely hard and extremely wide high-quality strip, and is beneficial to improving the quality of the strip.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of metal strip rolling, and particularly relates to an electric plasticity rolling method with transverse partition independent control. BACKGROUND

[0002] Strip shape is an important index of strip quality, and rolling pressure distribution is a fundamental factor affecting the strip shape. The rolling pressure distribution is affected by the transverse distribution of the roll gap, front and rear tension stress, and strip plasticity characteristic parameters. Conventional rolling generally adopts the means of bending roll, roll shifting (roll shape), segmented adjustment of backup roll, segmented cooling, and large tension to control the strip shape. However, the conventional strip shape control means has a limited control domain, and it is difficult to effectively control the complex high-order strip shape, especially as the strip rolling develops towards extremely thin, extremely hard, extremely wide, and center crown thinning control, the production process is prone to complex high-order waves and the coupling phenomenon of flatness and cross-sectional profile control.

[0003] As known from the above, an electric plasticity rolling method with transverse partition independent control is needed to control the strip shape. SUMMARY

[0004] To solve the shortcomings and deficiencies of the prior art, an electric plasticity rolling method with transverse partition independent control is provided, so as to solve the problem that the conventional strip shape control means has a limited control domain and is difficult to effectively control the complex high-order strip shape.

[0005] To achieve the object of the application, an electric plasticity rolling method with transverse partition independent control is provided, comprising the following steps:

[0006] S1: A point temperature measuring instrument matrix is arranged along the width direction of the strip at the entrance of the rolling mill to realize temperature measurement in the width direction of the strip at the entrance of the deformation zone. A strip shape instrument is arranged at the exit of the rolling mill as an online detection means for strip shape defects. Two groups of electric plasticity strip shape control roll systems are arranged at the entrance of the deformation zone, and the conductive copper rings in the two groups of electric plasticity strip shape control roll systems are alternately arranged along the width direction of the strip. The front and rear sides of the electric plasticity strip shape control roll system are provided with guide rolls, so as to ensure that the outer surface of the conductive copper ring in the electric plasticity strip shape control roll system is in good contact with the strip at all times.

[0007] S2: According to the measured results of the strip shape by the strip shape instrument, the strip shape closed-loop control algorithm according to the influence matrix method is used to determine the resistance of the electric plasticity strip shape control roll system for adjusting the deformation of the strip, and then the local heating temperature T of the electric plasticity strip shape control roll system is determined based on the strip deformation resistance-temperature flow curve. f ;

[0008] S3: According to the strip shape closed-loop control algorithm and the width of the strip, the serial number i of the conductive copper ring needing electric heating in the two groups of strip shape control roll systems is determined. l and ir Thus, the communication mode of the control circuit in the two groups of plate shape control roller systems is determined;

[0009] S4: The control circuit is used to control the pulse power heating of the conductive copper ring with serial number i l and i r that needs to be heated, temperature feedback is realized according to the temperature measuring instrument matrix, the pulse power voltage, current, pulse frequency and duty cycle are determined based on the electric pulse heating equation, and local electric heating temperature control of the strip is realized.

[0010] S5: The rolling control is performed in cycles according to S2-S4, local heating or softening of the strip is realized, the metal deformation resistance in the rolling deformation zone is changed, and the plate shape closed loop is realized.

[0011] As a further improvement of the above scheme, the strip deformation resistance-temperature rheological curve in step S2 is obtained by an experimental data fitting method, which satisfies:

[0012]

[0013] Where σ s is the strip deformation resistance, α is the material coefficient, κ is the offset coefficient, and T is the temperature.

[0014] The plate shape deviation is decomposed into 1-5th Legendre polynomials as the plate shape deviation basic mode (f1(y), f2(y), f3(y), f4(y), f5(y)), namely:

[0015] Δσ(y)=Δa1f1(y)+Δa2f2(y)+Δa3f3(y)+Δa4f4(y)+Δa5f5(y) (2)

[0016] The performance adjustment of the plate shape control mechanism is performed by using the influence function theory, and it is considered that the influence of a single plate shape control mechanism on each plate shape is a weighted linear combination of the plate shape deviation basic mode:

[0017] Δσ i (y)=Δu i [c 1i f1(y)+c 2i f2(y)+c 3i f3(y)+c 4i f4(y)+c 5i f5(y)] (3)

[0018] Then the plate shape deviation influence ability of each plate shape control mechanism of the electric plastic plate shape control roller means containing the online control of the plastic deformation resistance of the strip is:

[0019]

[0020] The above formula can be arranged as follows:

[0021]

[0022] The plate shape control target is to minimize the plate shape residual deviation after control, that is:

[0023] R = Δσ (y) - Δσ i (y) ≈ 0 (5)

[0024] Substituting formula (3) and (4) into formula (5), the following relationship can be obtained:

[0025]

[0026] Thus, the relationship between the strip plastic deformation resistance and the longitudinal residual stress deviation is established, wherein:

[0027] Δa i (i = 1, 2, 3, 4, 5) is a plate shape deviation characteristic parameter,

[0028] c ij is a influence matrix coefficient, which refers to the influence coefficient of the unit adjustment amount change of the jth plate shape control mechanism on the ith plate shape basic mode (i = 1, 2, 3, 4, 5);

[0029] n represents that the rolling mill has a total of n plate shape control means, the mth is a plate shape control means of the electric plasticity regulation of the strip plastic deformation resistance,

[0030] Δu j (j = 1, 2, … m …, n-1, n) is the adjustment amount of each plate shape control means, Δu m represents the local position plastic deformation resistance change amount corresponding to the strip defect;

[0031] After the target plate shape and the measured plate shape deviation Δσ (y) are determined, the strip plastic deformation resistance change amount Δu m is determined according to formula (2) and (6), and then the local strip temperature T f after the regulation by the electric plasticity plate shape control roller system as the control means is determined according to the current strip temperature and deformation resistance and formula (1).

[0032] As a further improvement of the above scheme, the implementation form of the step S3 is that the number of conductive copper rings in the two groups of electric plasticity plate shape control roller systems is even, and the width direction is symmetrically arranged about the center axis of the strip, and when taking the center of the strip as the horizontal coordinate origin, the width of the conductive copper ring is b d , and the width of the insulating ceramic ring is b j .

[0033] The scope set of the conductive copper ring in the first set of the electric plastic shape control roller is A, which contains n scopes:

[0034] {[y s1 ,y s1 +b d ],[y s2 ,y s2 +b d ],……,[y s(n-1) ,y s(n-1) +b d ],[y sn ,y sn +b d ]}

[0035] The scope set of the insulating ceramic ring in the first set of the electric plastic shape control roller is B, which contains n-1 scopes:

[0036]

[0037] The scope set of the conductive copper ring in the second set of the electric plastic shape control roller is C, which contains n-1 scopes:

[0038] {[y x1 ,y x1 +b d ],[y x2 ,y x2 +b d ],……,[y x(n-2) ,y x(n-2 )+b d ],[y x(n-1) ,y x(n-1) +b d ]}

[0039] The scope set of the insulating ceramic ring in the second set of the electric plastic shape control roller system is D, which contains n scopes:

[0040]

[0041] As a further improvement of the above scheme, when the left limit position of the strip shape defect is located in the mth segment of the conductive copper ring interval y ql ∈[y sm ,y sm +b d ] in the first set of the electric plastic shape control roller system, i l =m, and the right limit position is located in the kth segment of the conductive copper ring interval y qr ∈[y xk ,y xk +b d ] in the second set of the electric plastic shape control roller system, i r= k;

[0042] At this time, the PLC controller in the first set of electric plastic shape control roller system controls the mth contactor control coil to be connected, and then the mth path in the main circuit is connected through the contactor, so that the mth conductive copper ring in the first set of electric plastic shape control roller system is connected with the positive electrode of the power supply, and at the same time, the PLC controller in the second set of electric plastic shape control roller system controls the kth contactor control coil to be connected, and then the kth path in the main circuit is connected through the contactor, so that the kth conductive copper ring in the second set of electric plastic shape control roller system is connected with the negative electrode of the power supply.

[0043] As a further improvement of the above scheme, when the left limit position of the strip shape defect is located in the interval y ql ∈ [y sm ,y sm +b d ] of the mth conductive copper ring in the first set of electric plastic shape control roller system, i l = m, and the right limit position is located in the interval y qr ∈ [y sk ,y sk +b d ] of the kth conductive copper ring in the first set of electric plastic shape control roller system, i r = k,

[0044] At this time, the PLC controller in the first set of electric plastic shape control roller system controls the mth and kth contactor control coils to be connected, and then the mth and kth paths in the main circuit are connected through the contactor, so that the mth conductive copper ring in the first set of electric plastic shape control roller system is connected with the positive electrode of the power supply, and the kth conductive copper ring in the first set of electric plastic shape control roller system is connected with the negative electrode of the power supply.

[0045] As a further improvement of the above scheme, when the left limit position of the strip shape defect is located in the interval y ql ∈ [y xm ,y xm +b d ] of the mth conductive copper ring in the second set of electric plastic shape control roller system, i l = m, and the right limit position is located in the interval y qr ∈ [y sk ,y sk +b d ] of the kth conductive copper ring in the first set of electric plastic shape control roller system, i r = k,

[0046] At this time, the PLC controller in the second set of electric plastic shape control roller system controls the mth contactor control coil to be connected, and then the mth path in the main circuit is connected through the contactor, so that the mth conductive copper ring in the second set of electric plastic shape control roller system is connected with the positive electrode of the power supply, and the PLC controller in the first set of electric plastic shape control roller system controls the kth contactor control coil to be connected, and then the kth path in the main circuit is connected through the contactor, so that the kth conductive copper ring in the first set of electric plastic shape control roller system is connected with the negative electrode of the power supply.

[0047] As a further improvement of the above scheme, when the left limit position of the strip shape defect is located in the interval y ql ∈[y xm ,y xm +b d ] of the mth conductive copper ring in the second set of electric plastic shape control roller system, i l =m, and the right limit position is located in the interval y qr ∈[y xk ,y xk +b d ] of the kth conductive copper ring in the second set of electric plastic shape control roller system, i r =k,

[0048] At this time, the PLC controller in the second set of electric plastic shape control roller system controls the mth and kth contactor control coils to be connected, and then the mth and kth paths in the main circuit are connected through the contactor, so that the mth conductive copper ring in the second set of electric plastic shape control roller system is connected with the positive electrode of the power supply, and the kth conductive copper ring in the second set of electric plastic shape control roller system is connected with the negative electrode of the power supply.

[0049] The beneficial effects of the present application are:

[0050] Compared with the prior art, the transverse partition independent control electric plasticity rolling method provided by the application clearly defines the regulation and control logic and method of the transverse partition electric plasticity shape control means with the strip shape defect position temperature as the control target, considers the coupling influence of the electric plasticity change of the strip and other shape control means, determines the position of the conductive copper ring in each electric plasticity shape control roller system according to the shape defect position, ensures that the two groups of electric plasticity shape control roller systems and the strip form an electric circuit through the control circuit, realizes the transverse partition electric plasticity adjustment along the strip, and determines the local strip temperature after the regulation and control of the electric plasticity shape control roller system as the shape control means based on the influence matrix method and the strip plastic deformation resistance-temperature rheological curve relationship, realizes the online regulation and control of the temperature in the width direction of the strip at the entrance of the deformation zone through the electric plasticity shape control roller system, and plays the control ability and partition control flexibility of the electric plasticity on the shape, thereby providing a more powerful shape control means for the rolling of the extremely thin, extremely hard and extremely wide high-quality strip, and being beneficial to improving the strip quality. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 It is a schematic diagram of the contact between the two groups of electric plasticity shape control roller systems and the strip in the application;

[0052] Figure 2 It is a schematic diagram of the contact between the two groups of electric plasticity shape control roller systems and the strip in the application;

[0053] Figure 3 It is a schematic diagram of the contact between the two groups of electric plasticity shape control roller systems and the strip in the application;

[0054] Figure 4 It is a schematic diagram of the contact between the two groups of electric plasticity shape control roller systems and the strip in the application;

[0055] Figure 5 It is a schematic diagram of the contact between the two groups of electric plasticity shape control roller systems and the strip in the application;

[0056] Figure 6 It is a schematic diagram of the contact between the two groups of electric plasticity shape control roller systems and the strip in the application;

[0057] Figure 7 It is a schematic diagram of the contact between the two groups of electric plasticity shape control roller systems and the strip in the application;

[0058] Figure 8 It is a schematic diagram of the contact between the two groups of electric plasticity shape control roller systems and the strip in the application;

[0059] Figure 9 It is Figure 8 It is a schematic diagram of the contact between the two groups of electric plasticity shape control roller systems and the strip in the application;

[0060] Figure 10 It is Figure 9An enlarged schematic view of the middle circle B;

[0061] Figure 11 A schematic diagram of the main circuit line and hardware connection of the electroplastic sheet shape control roller system in the application;

[0062] Figure 12 A schematic diagram of the control circuit line and hardware connection of the electroplastic sheet shape control roller system in the application.

[0063] Wherein, 1 is a sheet shape control roller shaft; 2 is a conductive copper ring; 3 is an insulating ceramic ring; 4 is a bearing seat; 5 is an insulating lead; 6 is a shock-absorbing rubber sleeve; 7 is an insulating ceramic roller sleeve; 8 is a power supply; 9 is a key; 10 is a conductive rotary joint; 11 is a hole; 701 is a multi-way contactor; 702 is a multi-way fuse; 703 is a multi-way contactor; 704 is a multi-way thermal relay heating coil; 901 is a PLC controller; 902 is a multi-way contactor control coil; 903 is a multi-way thermal relay; 904 is an output circuit fuse; and 905 is an input main command button. DETAILED DESCRIPTION

[0064] The specific embodiments of the application will be further described in detail below with reference to the accompanying drawings:

[0065] According to Figures 1-12 , the application provides an electroplastic rolling method with transverse partition independent control, comprising the following steps:

[0066] S1: A matrix of point-shaped temperature measuring instruments is arranged along the width direction of the strip at the entrance of the rolling mill to realize temperature measurement in the width direction of the strip at the entrance of the deformation zone; a sheet shape instrument is arranged at the exit of the rolling mill as an online detection means for sheet shape defects; two groups of electroplastic sheet shape control roller systems are arranged at the entrance of the rolling deformation zone, and the conductive copper rings in the two groups of electroplastic sheet shape control roller systems are arranged alternately along the width direction of the strip, and guide rollers are arranged on the front and back sides of the electroplastic sheet shape control roller systems, so as to ensure that the outer surface of the conductive copper ring in the electroplastic sheet shape control roller system is in good contact with the strip at all times;

[0067] S2: According to the actual measurement results of the sheet shape of the strip by the sheet shape instrument, the sheet shape closed-loop control algorithm of the influence matrix method is used to determine the deformation resistance of the strip used for adjusting the deformation of the strip by the electroplastic sheet shape control roller system, and then the local heating temperature T of the electroplastic sheet shape control roller system is determined based on the strip deformation resistance-temperature flow curve. f ;

[0068] S3: According to the sheet shape closed-loop control algorithm and the width of the strip, the serial numbers i l and i r of the conductive copper rings in the two groups of sheet shape control roller systems that need to be electrically heated are determined, so as to determine the connection mode of the control circuits of the two groups of sheet shape control roller systems.

[0069] S4: using the control circuit to control the pulse power heating of the conductive copper ring with serial number i l and i r that needs to be heated, realizing temperature feedback according to the temperature meter matrix, determining the pulse power voltage, current, pulse frequency and duty cycle based on the electric pulse heating equation, and realizing local electric heating temperature control of the strip;

[0070] S5: performing rolling control according to the circulation of S2-S4, realizing local heating or softening of the strip, changing the metal deformation resistance in the rolling deformation zone, and realizing plate shape closed loop.

[0071] Among them, the strip deformation resistance-temperature rheological curve in step S2 is obtained by experimental data fitting method, which satisfies:

[0072]

[0073] Where σ s is the strip deformation resistance, α is the material coefficient, κ is the offset coefficient, and T is the temperature;

[0074] The plate shape deviation is decomposed into 1-5 Legendre polynomials as the plate shape deviation basic mode (f1(y), f2(y), f3(y), f4(y), f5(y)), that is:

[0075] Δσ(y)=Δa1f1(y)+Δa2f2(y)+Δa3f3(y)+Δa4f4(y)+Δa5f5(y) (2)

[0076] The performance of the plate shape control mechanism is adjusted by using the influence function theory, and it is considered that the influence of a single plate shape control mechanism on each plate shape is a weighted linear combination of the plate shape deviation basic mode:

[0077] Δσ i (y)=Δu i [c 1i f1(y)+c 2i f2(y)+c 3i f3(y)+c 4i f4(y)+c 5i f5(y)] (3)

[0078] Then the plate shape deviation influence ability of each plate shape control mechanism of the electric plastic plate shape control roller means containing online regulation of the plastic deformation resistance of the strip is:

[0079]

[0080] The above formula can be arranged as:

[0081]

[0082] The control target of the plate shape is to minimize the plate shape residual deviation after control, that is:

[0083] R = Δσ (y) - Δσ i (y) ≈ 0 (5)

[0084] Substituting formula (3) and (4) into formula (5) can obtain the following relationship:

[0085]

[0086] Thus, the relationship between the plastic deformation resistance of the strip and the longitudinal residual stress deviation is established, wherein:

[0087] Δa i (i = 1, 2, 3, 4, 5) is a plate shape deviation characteristic parameter,

[0088] c ij is a influence matrix coefficient, which refers to the influence coefficient of the unit adjustment amount change of the jth plate shape regulation mechanism of the rolling mill on the i th plate shape basic mode (i = 1, 2, 3, 4, 5);

[0089] n represents that the rolling mill has n kinds of plate shape control means in total, the m th is the plate shape control means of the electric plasticity regulation of the plastic deformation resistance of the strip,

[0090] Δu j (j = 1, 2, … m …, n-1, n) is the adjustment amount of each plate shape control means, Δu m represents the local position plastic deformation resistance change amount corresponding to the strip defect;

[0091] After the target plate shape and the measured plate shape deviation Δσ (y) are determined, the plastic deformation resistance change amount Δu m of the strip is determined according to formula (2) and (6), and then the local strip temperature T f after the regulation by the electric plasticity plate shape control roller system as the control means according to the current strip temperature and deformation resistance is determined by combining formula (1).

[0092] In addition, the implementation form of step S3 is that the number of the conductive copper rings in the two groups of electric plasticity plate shape control roller systems is even, and the width direction is symmetrically arranged about the center axis of the strip, when taking the center of the strip as the horizontal coordinate origin, the width of the conductive copper ring is b d , and the width of the insulating ceramic ring is b j .

[0093] Then the scope set of the conductive copper ring in the posture of the first group of electric plasticity plate shape control roller is A, which contains n segments, and the scope of each segment is:

[0094] {[y s1 ,y s1 +bd ],[y s2 ,y s2 +b d ],……,[y s(n-1) ,y s(n-1) +b d ],[y sn ,y sn +b d}

[0095] The scope set of the insulating ceramic ring in the first group of the electroplastic shape control roller is B, containing n-1 scopes, and the scope is:

[0096]

[0097] The scope set of the conductive copper ring in the second group of the electroplastic shape control roller is C, containing n-1 scopes, and the scope is:

[0098] {[y x1 ,y x1 +b d ],[y x2 ,y x2 +b d ],……,[y x(n-2) ,y x(n-2) +b d ],[y x(n-1) ,y x(n-1) +b d}

[0099] The scope set of the insulating ceramic ring in the second group of the electroplastic shape control roller system is D, containing n scopes, and the scope is:

[0100]

[0101] ①When the left limit position of the strip shape defect is located in the mth segment of the conductive copper ring interval y ql ∈[y sm ,y sm +b d ] in the first group of the electroplastic shape control roller system, then i l =m, and the right limit position is located in the kth segment of the conductive copper ring interval y qr ∈[y xk ,y xk +b d ] in the second group of the electroplastic shape control roller system, then i r =k;

[0102] At this time, the PLC controller in the first set of electric plastic shape control roller system controls the mth contactor control coil to be connected, and then the mth path in the main circuit is connected through the contactor, so that the mth conductive copper ring in the first set of electric plastic shape control roller system is connected with the positive electrode of the power supply, and at the same time, the PLC controller in the second set of electric plastic shape control roller system controls the kth contactor control coil to be connected, and then the kth path in the main circuit is connected through the contactor, so that the kth conductive copper ring in the second set of electric plastic shape control roller system is connected with the negative electrode of the power supply.

[0103] ②When the left limit position of the strip shape defect is located in the mth conductive copper ring interval y ql ∈[y sm ,y sm +b d ] of the first set of electric plastic shape control roller system, i l =m, and the right limit position is located in the kth conductive copper ring interval y qr ∈[y sk ,y sk +b d ] of the first set of electric plastic shape control roller system, i r =k.

[0104] At this time, the PLC controller in the first set of electric plastic shape control roller system controls the mth and kth contactor control coils to be connected, and then the mth and kth paths in the main circuit are connected through the contactors, so that the mth conductive copper ring in the first set of electric plastic shape control roller system is connected with the positive electrode of the power supply, and the kth conductive copper ring in the first set of electric plastic shape control roller system is connected with the negative electrode of the power supply.

[0105] ③When the left limit position of the strip shape defect is located in the mth conductive copper ring interval y ql ∈[y xm ,y xm +b d ] of the second set of electric plastic shape control roller system, i l =m, and the right limit position is located in the kth conductive copper ring interval y qr ∈[y sk ,y sk +b d ] of the first set of electric plastic shape control roller system, i r =k.

[0106] At this time, the PLC controller in the second set of electric plastic shape control roller system controls the mth contactor control coil to be connected, and then the mth path in the main circuit is connected through the contactor, so that the mth conductive copper ring in the second set of electric plastic shape control roller system is connected with the positive electrode of the power supply, and the PLC controller in the first set of electric plastic shape control roller system controls the kth contactor control coil to be connected, and then the kth path in the main circuit is connected through the contactor, so that the kth conductive copper ring in the first set of electric plastic shape control roller system is connected with the negative electrode of the power supply.

[0107] ④When the left limit position of the strip shape defect is located in the interval y ql ∈[y xm ,y xm +b d of the mth conductive copper ring in the second set of electric plastic shape control roller system, i l =m, and the right limit position is located in the interval y qr ∈[y xk ,y xk +b d of the kth conductive copper ring in the second set of electric plastic shape control roller system, i r =k.

[0108] At this time, the PLC controller in the second set of electric plastic shape control roller system controls the mth and kth contactor control coils to be connected, and then the mth and kth paths in the main circuit are connected through the contactor, so that the mth conductive copper ring in the second set of electric plastic shape control roller system is connected with the positive electrode of the power supply, and the kth conductive copper ring in the second set of electric plastic shape control roller system is connected with the negative electrode of the power supply.

[0109] ⑤When there are multiple shape defects at the same longitudinal position on the surface of the strip, the control logic of the conductive copper ring circuit on the two sets of electric plastic shape control roller systems is similar to that of ①-④, and it is necessary to ensure that all the conductive copper rings on the same electric plastic shape control roller system are connected with the same pole of the power supply, and all the conductive copper rings on the other electric plastic shape control roller system are connected with the opposite pole of the power supply. The control circuits of the two sets of electric plastic deformation control roller systems need to communicate with each other and be controlled cooperatively to ensure that the conductive copper rings on the two sets of electric plastic deformation control roller systems are respectively connected to the two opposite poles of the power supply.

[0110] The electric plasticity plate shape control roller system mentioned in the method comprises a plate shape control roller shaft 1, both ends of the plate shape control roller shaft 1 are inserted into bearing seats 4 to be fixed, electric rotating joints 10 are respectively sleeved on the outer walls of the both ends of the plate shape control roller shaft 1, a plurality of electric copper rings 2 are sleeved on the outer wall of the middle part of the plate shape control roller shaft 1, insulating ceramic rings 3 are arranged between adjacent electric copper rings 2 to isolate the electric copper rings 2, a plurality of holes 11 are formed in the plate shape control roller shaft 1, insulating wires 5 are arranged in the holes 11, one end of the insulating wires 5 is connected with the inner wall of the electric copper ring 2, and the other end is connected with the electric rotating joint 10 to transmit current, the electric rotating joint 10 is communicated with a main circuit and a control circuit to realize on-off control of different electric copper rings 2.

[0111] The main circuit comprises a power supply 8, a first multi-way contactor 701, a second multi-way contactor 703 and a multi-way thermal relay heating coil 704, the positive pole of the power supply 8 is connected with one end of the first multi-way contactor 701, the other end of the first multi-way contactor 701 is connected with the electric rotating joint 10 at one end of the plate shape control roller shaft 1, the negative pole of the power supply 8 is connected with one end of the multi-way thermal relay heating coil 704, the other end of the multi-way thermal relay heating coil 704 is connected with one end of the second multi-way contactor 703, the other end of the second multi-way contactor 703 is connected with the electric rotating joint 10 at the other end of the plate shape control roller shaft 1, the electric rotating joints 10 at both ends of the plate shape control roller shaft 1 are connected with corresponding electric copper rings 2 through the insulating wires 5, and a plurality of fuses 702 are arranged on the line, in which the positive pole of the power supply 8 is connected with the first multi-way contactor 701, to protect the normal operation of the main circuit.

[0112] The control circuit comprises a power supply 8, a PLC controller 901, a multi-way contactor control coil 902, a multi-way thermal relay 903, an output circuit fuse 904 and an input master button 905; the pins X000-X002 of the PLC controller 901 are respectively connected with one end of SB1-SB3 in the input master button 905, the other end of SB1-SB3 in the input master button 905 is connected with the pin COM of the PLC controller 901; the pin COM0 of the PLC controller 901 is connected with one end of the output circuit fuse 904, the other end of the output circuit fuse 904 is connected with the positive pole of the power supply 8, the pins Y000-Y00n of the PLC controller 901 are respectively connected with one end of KM1-KMn in the multi-way contactor control coil 902, the pins Y00(n+1)-Y00(2n) of the PLC controller 901 are respectively connected with one end of KM1a-KMna in the multi-way contactor control coil 902, the other end of KM1a-KMna in the multi-way contactor control coil 902 is respectively connected with one end of KH1a-KHna in the multi-way thermal relay 903, the other end of KM1-KMn in the multi-way contactor control coil 902 and the other end of KH1a-KHna in the multi-way thermal relay 903 are connected with the negative pole of the power supply 8.

[0113] The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments can be combined with each other to form new embodiments. The above embodiments are only used to illustrate the technical solutions of the present application and not to limit them, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered in the scope of the technical solutions of the present application.

Claims

1. A method of transverse zonal independent control electroplastic rolling, characterized in that: Comprising the following steps: S1: arranging a matrix of point temperature measuring instruments along the strip width direction at the entrance of the rolling mill to realize temperature measurement of the strip width direction at the entrance of the deformation zone; arranging a shape meter at the exit of the rolling mill as an on-line detection means for shape defects; arranging two groups of electro-plastic shape control roller systems at the entrance of the rolling deformation zone, and the conductive copper rings in the two groups of electro-plastic shape control roller systems are arranged alternately along the strip width direction, and the front and back sides of the electro-plastic shape control roller system are provided with guide rollers, so as to ensure that the outer surface of the conductive copper ring in the electro-plastic shape control roller system is always in good contact with the strip; S2: according to the measured results of the strip shape by the sheet shape instrument, the strip shape closed loop control algorithm of the influence matrix method is used to determine the resistance of the electric plastic strip shape control roller system for adjusting the strip deformation, and then the local heating temperature of the electric plastic strip shape control roller system is determined based on the strip deformation resistance-temperature rheological curve ; The strip deformation resistance-temperature flow curve in the step S2 is obtained by using an experimental data fitting method, and satisfies: （1）； wherein is the strip deformation resistance, is the material coefficient, is the offset coefficient, is the temperature; The 1-5th Legendre polynomials are used as basic modes of the plate shape deviation , , , , The plate shape deviation is decomposed into 1-5th Legendre polynomials, i.e. （2）； The performance adjustment of the shape control mechanism is carried out by using the influence function theory, and it is considered that the influence of a single shape control mechanism on each shape is a weighted linear combination of the basic modes of the shape deviation: （3）； The shape deviation influence ability of each shape control mechanism containing the electro-plastic shape control roller means of the strip plastic deformation resistance on-line control is: ； The above formula can be arranged as: （4）； The shape control target is to minimize the residual deviation of the controlled shape, that is: （5）； The formula (3) and (4) are substituted into the formula (5) to obtain the following relationship: （6）； Thus, the relationship between the strip plastic deformation resistance and the longitudinal residual stress deviation is established, wherein: (i = 1, 2, 3, 4, 5) are plate shape deviation characteristic parameters, For the influence matrix coefficient, it refers to the influence coefficient of the unit adjustment amount change of the jth plate shape control mechanism of the rolling mill on the ith plate shape basic mode (i = 1, 2, 3, 4, 5). n represents that the rolling mill has n kinds of shape control means in total, and the mth kind is the electro-plastic control of the strip plastic deformation resistance, (j = 1, 2,... m,..., n - 1, n) is the adjustment amount of each plate-shaped control means, represents the amount of change in the local position plastic deformation resistance corresponding to the strip defects; In determining the target plate shape and the measured plate shape deviation After that, the strip plastic deformation resistance change amount is determined according to formula (2) and (6) And then, the local strip temperature after being adjusted by taking the electrical plastic plate shape control roller system as the control means is determined according to the current strip temperature and the deformation resistance by combining formula (1) ; S3: According to the strip shape closed-loop control algorithm and the strip width, determine the sequence number of the conductive copper ring in the two groups of strip shape control roller systems that need to be electrically heated and , so as to determine the connection mode of the control circuit in the two groups of strip shape control roller systems. S4: using the control circuit to control the pulse power heating of the conductive copper ring with serial number and that needs to be heated, realizing temperature feedback according to the thermocouple matrix, determining the pulse power voltage, current, pulse frequency and duty cycle based on the electric pulse heating equation, and realizing the local electric heating temperature control of the strip; S5: carrying out rolling control according to S2-S4 to realize local heating or softening of the strip, change the metal deformation resistance in the rolling deformation zone, and realize closed loop control of the shape.

2. A transverse zoned independent control electioplastic rolling method according to claim 1, characterized in that: The implementation form of the step S3 is that the number of the conductive copper rings in the two groups of the electroplastic plate-shaped control roller systems is even, and the width direction is symmetrically arranged about the center axis of the strip, when taking the center of the strip as the horizontal coordinate origin, the width of the conductive copper ring is , and the width of the insulating ceramic ring is , The scope set of the conductive copper ring in the posture of the first group of electro-plastic shape control rollers is A, which contains n segments of scope: ； The scope set of the insulating ceramic ring in the first group of electro-plastic shape control rollers is B, which contains n-1 segments of scope: ； The scope set of the conductive copper ring in the second group of electro-plastic shape control rollers is C, which contains n-1 segments of scope: ； The scope set of the insulating ceramic ring in the second group of electro-plastic shape control roller systems is D, which contains n segments of scope: 。 3. The transverse zoned independent control electioplastic rolling method according to claim 2, characterized in that: When the left limit position of the strip plate shape defect is located in the mth segment of the conductive copper ring interval in the first set of electroplastic plate shape control roller system , the right limit position is located in the kth segment of the conductive copper ring interval in the second set of electroplastic plate shape control roller system , the right limit position is located in the kth segment of the conductive copper ring interval in the second set of electroplastic plate shape control roller system , the right limit position is located in the kth segment of the conductive copper ring interval in the second set of electroplastic plate shape control roller system ; At this time, the PLC controller in the first group of electro-plastic shape control roller systems controls the mth contactor control coil to be connected, and then the mth in the main circuit is connected through the contactor, so that the mth segment of the conductive copper ring in the first group of electro-plastic shape control roller systems is connected with the positive electrode of the power supply, and at the same time, the PLC controller in the second group of electro-plastic shape control roller systems controls the kth contactor control coil to be connected, and then the kth in the main circuit is connected through the contactor, so that the kth segment of the conductive copper ring in the second group of electro-plastic shape control roller systems is connected with the negative electrode of the power supply.

4. The transverse zoned independent control electioplastic rolling method according to claim 2, characterized in that: When the left limit position of the strip plate shape defect is located in the mth segment of the conductive copper ring interval of the first set of electroplastic plate shape control roller system , then , the right limit position is located in the kth segment of the conductive copper ring interval of the first set of electroplastic plate shape control roller system , then , At this time, the PLC controller in the first group of electro-plastic shape control roller systems controls the mth and kth contactor control coils to be connected, and then the mth and kth in the main circuit are connected through the contactor, so that the mth segment of the conductive copper ring in the first group of electro-plastic shape control roller systems is connected with the positive electrode of the power supply, and the kth segment of the conductive copper ring in the first group of electro-plastic shape control roller systems is connected with the negative electrode of the power supply.

5. The transverse zoned independent control electioplastic rolling method according to claim 2, characterized in that: When the left limit position of the strip flatness defect is located in the mth conductive copper ring interval of the second set of electroplastic flatness control roller systems , then , the right limit position is located in the kth conductive copper ring interval of the first set of electroplastic flatness control roller systems , then , At this time, the PLC controller in the second set of electric plastic sheet shape control roller system controls the mth contactor control coil to be connected, and then the mth path in the main circuit is connected through the contactor, so that the mth conductive copper ring in the second set of electric plastic sheet shape control roller system is connected with the positive electrode of the power supply, and the PLC controller in the first set of electric plastic sheet shape control roller system controls the kth contactor control coil to be connected, and then the kth path in the main circuit is connected through the contactor, so that the kth conductive copper ring in the first set of electric plastic sheet shape control roller system is connected with the negative electrode of the power supply.

6. The transverse zoned independent control electioplastic rolling method according to claim 2, characterized in that: When the left limit position of the strip plate shape defect is located in the mth segment of the conductive copper ring interval of the second set of electroplastic plate shape control roller system , then , the right limit position is located in the kth segment of the conductive copper ring interval of the second set of electroplastic plate shape control roller system , then , At this time, the PLC controller in the second set of electric plastic sheet shape control roller system controls the mth and kth contactor control coils to be connected, and then the mth and kth paths in the main circuit are connected through the contactor, so that the mth conductive copper ring in the second set of electric plastic sheet shape control roller system is connected with the positive electrode of the power supply, and the kth conductive copper ring in the second set of electric plastic sheet shape control roller system is connected with the negative electrode of the power supply.

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