Transverse partition independent control electroplastic rolling method

Abstract

According to the electro-plastic rolling method with the transverse partition independent control function, the regulation and control logic and method of a transverse partition electro-plastic plate shape control means with the strip plate shape defect position temperature as the control target are defined, and the positions of conductive copper rings in all electro-plastic plate shape control roller systems are determined according to the plate shape defect positions; the two groups of electro-plastic plate shape control roller systems and the strip are ensured to form an electric loop through a control circuit, so that the transverse zoning electro-plastic adjustment along the strip is realized; in addition, the strip plastic deformation resistance variable quantity is determined on the basis of an influence matrix method, and then the strip deformation resistance-temperature rheology curve relation is combined to determine the local strip temperature regulated and controlled with an electro-plastic strip shape control roller system as a strip shape control means; the temperature on-line regulation and control in the width direction of the strip at the inlet of the deformation area is realized through the electro-plastic strip shape control roller system, a more powerful strip shape control means is provided for rolling of extremely thin, extremely hard and extremely wide high-quality strips, and the quality of the strip is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of metal strip rolling, and in particular relates to an electroplastic rolling method with independent control of transverse partitions. Background Art

[0002] The shape of plates and strips is an important indicator of strip quality, and the rolling pressure distribution is the fundamental factor affecting the strip shape. The rolling pressure distribution is affected by the lateral distribution of the roll gap, the front and rear tensile stresses, the plastic characteristic parameters of the strip, etc. Conventional rolling generally adopts bending rolls, shifting rolls (roller shape), segmented adjustment of support rolls, segmented cooling, high tension and other means to control the strip shape. However, the conventional strip shape control means have a limited control range and it is difficult to effectively achieve the control of complex and high-order strip shapes. In particular, as strip rolling develops towards extremely thin, extremely hard, and extremely wide strips, and as the center convexity develops towards edge thinning control, complex and high-order waves and the coupling phenomenon of flatness and cross-sectional profile control are very likely to occur in the production process.

[0003] From the above, it can be seen that there is an urgent need for an electroplastic rolling method with independent control of transverse partitions to control the plate shape. Summary of the invention

[0004] In order to solve the shortcomings and deficiencies of the prior art, a method of electroplastic rolling with independent control of lateral partitions is provided, thereby solving the problem that the existing conventional plate shape control means have a limited control domain and are difficult to effectively achieve complex high-order plate shape control.

[0005] To achieve the purpose of the present invention, a method for electroplastic rolling with independent control of transverse partitions is provided, comprising the following steps:

[0006] S1: A matrix of point temperature measuring instruments is arranged along the strip width direction at the entrance of the rolling mill to realize the temperature measurement in the strip width direction at the entrance of the deformation zone; a flatness meter is arranged at the exit of the rolling mill as an online detection method for flatness defects; two sets of electroplastic flatness control roller systems are arranged at the entrance of the rolling deformation zone, and the conductive copper rings in the two sets of electroplastic flatness control roller systems are arranged alternately along the strip width direction, and guide rollers are provided on the front and rear sides of the electroplastic flatness control roller system to ensure that the outer surface of the conductive copper ring in the electroplastic flatness control roller system is always in good contact with the strip;

[0007] S2: According to the actual measurement results of the strip shape by the shape meter, the shape closed-loop control algorithm of the influence matrix method is used to determine the resistance of the electroplastic shape control roller system to adjust the strip deformation, and then the local heating temperature T of the electroplastic shape control roller system is determined based on the strip deformation resistance-temperature rheological curve. f ;

[0008] S3: According to the plate shape closed-loop control algorithm and the strip width, determine the serial number i of the conductive copper ring that needs to be electrically heated in the two sets of plate shape control roller systems l and ir , thereby determining the connection mode of the control circuits in the two sets of plate shape control roller systems;

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

[0010] S5: Perform rolling control according to the S2-S4 cycle to achieve local heating or softening of the strip, change the metal deformation resistance in the rolling deformation zone, and achieve a closed loop of plate shape.

[0011] As a further improvement of the above solution, the strip deformation resistance-temperature rheological curve in step S2 is obtained by using 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 deflection coefficient, and T is the temperature;

[0014] The 1st to 5th degree Legendre polynomials are used as the basic mode of flatness deviation (f 1 (y), f 2 (y), f 3 (y), f 4 (y), f 5 (y)), the plate shape deviation is decomposed into 1-5th order Legendre polynomials, namely:

[0015] Δσ(y)=Δa 1 f 1 (y)+Δa 2 f 2 (y)+Δa 3 f 3 (y)+Δa 4 f 4 (y)+Δa 5 f 5 (y) (2)

[0016] The influence function theory is used to adjust the performance of the flatness control mechanism. It is considered that the influence of a single flatness control mechanism on each flatness is a weighted linear combination of the basic modes of flatness deviation:

[0017] Δσ i (y) = Δu i [c 1i f 1 (y)+c 2i f2 (y)+c 3i f 3 (y)+c 4i f 4 (y)+c 5i f 5 (y)] (3)

[0018] Then the shape deviation influence capacity of each shape control mechanism including the electroplastic shape control roller means for online regulation of strip plastic deformation resistance is:

[0019]

[0020] Rearranging the above formula yields:

[0021]

[0022] The goal of flatness control is to minimize the residual deviation of the flatness after control, that is:

[0023] R=Δσ(y)-Δσ i (y)≈0 (5)

[0024] Substituting equations (3) and (4) into equation (5), we can obtain the following relationship:

[0025]

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

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

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

[0029] n means that the rolling mill has a total of n types of flatness control methods, and the mth type is the flatness control method of electro-plastic regulation of 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 Indicates the change in plastic deformation resistance at the local position corresponding to the strip defect;

[0031] After determining the deviation Δσ(y) between the target shape and the measured shape, the change in the strip plastic deformation resistance Δu is determined according to equations (2) and (6): m, and then combined with formula (1), the local strip temperature T after being controlled by the electroplastic shape control roller system is determined according to the current strip temperature and deformation resistance. f .

[0032] As a further improvement of the above scheme, the implementation form of step S3 is as follows: the number of conductive copper rings in the two sets of electroplastic plate shape control roller systems is an even number, and the width direction is symmetrically arranged about the center axis of the strip. When the center of the strip is taken as the origin of the horizontal coordinate, the width of the conductive copper ring is b d , the width of the insulating ceramic ring is b j ,

[0033] Then the scope set of the conductive copper ring in the first group of electroplastic plate shape control roller posture 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 rings in the first group of electroplastic shape control rollers is B, which contains n-1 scopes:

[0036]

[0037] The scope set of the conductive copper rings in the second group of electroplastic shape control rollers is C, which contains n-1 segments of scope:

[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 rings in the second group of electroplastic shape control roller systems 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 conductive copper ring interval y in the first group of electroplastic shape control roller system, ql ∈[y sm ,y sm +b d ], then i l = m, the right limit position is located in the kth conductive copper ring section y in the second set of electroplastic plate shape control roller system qr ∈[y xk ,y xk +b d ], then i r = k;

[0042] At this time, the PLC controller in the first group of electroplastic plate shape control roller system controls the mth contactor control coil to be turned on, and then the mth path in the main circuit is connected through the contactor, so that the mth section of the conductive copper ring in the first group of electroplastic plate shape control roller system is connected to the positive pole of the power supply. At the same time, the PLC controller in the second group of electroplastic plate shape control roller system controls the kth contactor control coil to be turned on, and then the kth path in the main circuit is connected through the contactor, so that the kth section of the conductive copper ring in the second group of electroplastic plate shape control roller system is connected to the negative pole 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 mth conductive copper ring interval y in the first group of electroplastic shape control roller system, ql ∈[y sm ,y sm +b d ], then i l = m, the right limit position is located in the kth conductive copper ring section y of the first set of electroplastic plate shape control roller system qr ∈[y sk ,y sk +b d ], then i r = k,

[0044] At this time, the PLC controller in the first group of electroplastic plate 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 section of the conductive copper ring in the first group of electroplastic plate shape control roller system is connected to the positive pole of the power supply, and the kth section of the conductive copper ring in the first group of electroplastic plate shape control roller system is connected to the negative pole 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 mth conductive copper ring interval y in the second set of electroplastic shape control roller system, ql ∈[y xm ,y xm +bd ], then i l = m, the right limit position is located in the kth conductive copper ring section y of the first set of electroplastic plate shape control roller system qr ∈[y sk ,y sk +b d ], then i r = k,

[0046] At this time, the PLC controller in the second group of electroplastic plate shape control roller system controls the mth contactor control coil to be turned on, and then the mth path in the main circuit is connected through the contactor, so that the mth section of the conductive copper ring in the second group of electroplastic plate shape control roller system is connected to the positive pole of the power supply. At the same time, the PLC controller in the first group of electroplastic plate shape control roller system controls the kth contactor control coil to be turned on, and then the kth path in the main circuit is connected through the contactor, so that the kth section of the conductive copper ring in the first group of electroplastic plate shape control roller system is connected to the negative pole 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 mth conductive copper ring interval y in the second set of electroplastic shape control roller system, ql ∈[y xm ,y xm +b d ], then i l = m, the right limit position is located in the kth section of the conductive copper ring interval y in the second set of electroplastic plate shape control roller system qr ∈[y xk ,y xk +b d ], then i r = k,

[0048] At this time, the PLC controller in the second group of electroplastic plate shape control roller system controls the mth and kth contactor control coils to be turned on, and then the mth and kth paths in the main circuit are connected through the contactor, so that the mth section of the conductive copper ring in the second group of electroplastic plate shape control roller system is connected to the positive pole of the power supply, and the kth section of the conductive copper ring in the second group of electroplastic plate shape control roller system is connected to the negative pole of the power supply.

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

[0050] Compared with the prior art, the present invention provides an electroplastic rolling method with independent control of transverse partitions, clarifies the control logic and method of the transverse partition electroplastic shape control means with the temperature of the strip shape defect position as the control target, considers the coupling influence of the strip electroplastic change and other shape control means, determines the position of the conductive copper ring in each electroplastic shape control roller system according to the shape defect position, ensures that the two groups of electroplastic shape control roller systems and the strip form an electric circuit through the control circuit, and realizes electroplastic regulation along the transverse partition of the strip; in addition, based on the influence matrix method, the change in the strip plastic deformation resistance is determined, and then combined with the strip deformation resistance-temperature rheological curve relationship, the local strip temperature after the electroplastic shape control roller system is used as the shape control means is determined, and combined with the point temperature measuring instrument matrix, the electroplastic shape control roller system is used to realize the online temperature control in the width direction of the strip at the entrance of the deformation zone, so as to give full play to the control ability of electroplasticity on the shape and the flexibility of partition control, and provide a more powerful shape control means for the rolling of extremely thin, extremely hard, extremely wide and high-quality strips, which is conducive to improving the quality of plates and strips. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic diagram of the contact between two sets of electroplastic shape control roller systems and the strip in the present invention;

[0052] Figure 2 It is a schematic diagram of the method for determining the serial number of the conductive copper ring in the present invention;

[0053] Figure 3 It is a front view of the method for determining the serial number of the conductive copper ring in the present invention;

[0054] Figure 4 A top view of the method for determining the serial number of the conductive copper ring in the present invention;

[0055] Figure 5 It is a front view of an equivalent circuit formed by two sets of electroplastic plate shape control roller systems near the defect position in the present invention;

[0056] Figure 6 A top view of an equivalent circuit formed by two sets of electroplastic shape control roller systems near a defect position in the present invention;

[0057] Figure 7 Schematic diagram of the electroplastic plate shape control roller system of the present invention;

[0058] Figure 8 A top view of the electroplastic plate shape control roller system of the present invention;

[0059] Fig. 9 for Figure 8 Schematic diagram of the cross section of AA;

[0060] Fig.10 for Fig. 9Enlarged schematic diagram of the middle circle B;

[0061] Fig.11 It is a schematic diagram of the main circuit and hardware connection of the electroplastic plate shape control roller system in the present invention;

[0062] Fig.12 It is a schematic diagram of the control circuit line and hardware connection of the electroplastic plate shape control roller system in the present invention.

[0063] Among them, 1-plate-shaped control roller core shaft; 2-conductive copper ring; 3-insulating ceramic ring; 4-bearing seat; 5-insulated wire; 6-shock-absorbing rubber sleeve; 7-insulating ceramic roller sleeve; 8-power supply; 9-key; 10-conductive rotary joint; 11-channel; 701-multi-way contactor; 702-multi-way fuse; 703-multi-way contactor; 704-multi-way thermal relay heating coil; 901-PLC controller; 902-multi-way contactor control coil; 903-multi-way thermal relay; 904-output circuit fuse; 905-input main command button. DETAILED DESCRIPTION

[0064] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings:

[0065] according to Figure 1-Figure 12 As shown, the present invention provides an electroplastic rolling method with independent control of transverse partitions, comprising the following steps:

[0066] S1: A matrix of point temperature measuring instruments is arranged along the strip width direction at the entrance of the rolling mill to realize the temperature measurement in the strip width direction at the entrance of the deformation zone; a flatness meter is arranged at the exit of the rolling mill as an online detection method for flatness defects; two sets of electroplastic flatness control roller systems are arranged at the entrance of the rolling deformation zone, and the conductive copper rings in the two sets of electroplastic flatness control roller systems are arranged alternately along the strip width direction, and guide rollers are provided on the front and rear sides of the electroplastic flatness control roller system to ensure that the outer surface of the conductive copper ring in the electroplastic flatness control roller system is always in good contact with the strip;

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

[0068] S3: According to the plate shape closed-loop control algorithm and the strip width, determine the serial number i of the conductive copper ring that needs to be electrically heated in the two sets of plate shape control roller systems l and i r , thereby determining the connection mode of the control circuits in the two sets of plate shape control roller systems;

[0069] S4: Use the control circuit to l and i r The conductive copper ring that needs to be heated is subjected to pulse power supply heating control, temperature feedback is realized according to the temperature measuring instrument matrix, and the pulse power supply voltage, current, pulse frequency and duty cycle are determined based on the electric pulse heating equation to realize local electric heating temperature control of the strip;

[0070] S5: Perform rolling control according to the S2-S4 cycle to achieve local heating or softening of the strip, change the metal deformation resistance in the rolling deformation zone, and achieve a closed loop of plate shape.

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

[0072]

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

[0074] The 1st to 5th degree Legendre polynomials are used as the basic mode of flatness deviation (f 1 (y), f 2 (y), f 3 (y), f 4 (y), f 5 (y)), the plate shape deviation is decomposed into 1-5th order Legendre polynomials, namely:

[0075] Δσ(y)=Δa 1 f 1 (y)+Δa 2 f 2 (y)+Δa 3 f 3 (y)+Δa 4 f 4 (y)+Δa 5 f 5 (y) (2)

[0076] The influence function theory is used to adjust the performance of the flatness control mechanism. It is considered that the influence of a single flatness control mechanism on each flatness is a weighted linear combination of the basic modes of flatness deviation:

[0077] Δσ i (y) = Δu i [c 1i f 1 (y)+c 2i f 2 (y)+c 3i f 3 (y)+c 4i f4 (y)+c 5i f 5 (y)] (3)

[0078] Then the shape deviation influence capacity of each shape control mechanism including the electroplastic shape control roller means for online regulation of strip plastic deformation resistance is:

[0079]

[0080] Rearranging the above formula yields:

[0081]

[0082] The goal of flatness control is to minimize the residual deviation of the flatness after control, that is:

[0083] R=Δσ(y)-Δσ i (y)≈0 (5)

[0084] Substituting equations (3) and (4) into equation (5), we can obtain the following relationship:

[0085]

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

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

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

[0089] n means that the rolling mill has a total of n types of flatness control methods, and the mth type is the flatness control method of electro-plastic regulation of strip plastic deformation resistance.

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

[0091] After determining the deviation Δσ(y) between the target shape and the measured shape, the change in the strip plastic deformation resistance Δu is determined according to equations (2) and (6): m , and then combined with formula (1), the local strip temperature T after being controlled by the electroplastic shape control roller system is determined according to the current strip temperature and deformation resistance. f .

[0092] In addition, the implementation form of step S3 is: the number of conductive copper rings in the two sets of electroplastic plate shape control roller systems is an even number, and the width direction is symmetrically arranged about the center axis of the strip. When the center of the strip is taken as the origin of the horizontal coordinate, the width of the conductive copper ring is b d , the width of the insulating ceramic ring is b j ,

[0093] Then the scope set of the conductive copper ring in the first group of electroplastic plate shape control roller posture is A, which contains n scopes:

[0094] {[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 ]}

[0095] The scope set of the insulating ceramic rings in the first group of electroplastic shape control rollers is B, which contains n-1 scopes:

[0096]

[0097] The scope set of the conductive copper rings in the second group of electroplastic shape control rollers is C, which contains n-1 segments of scope:

[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 rings in the second group of electroplastic shape control roller systems is D, which contains n scopes:

[0100]

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

[0102] At this time, the PLC controller in the first group of electroplastic plate shape control roller system controls the mth contactor control coil to be turned on, and then the mth path in the main circuit is connected through the contactor, so that the mth section of the conductive copper ring in the first group of electroplastic plate shape control roller system is connected to the positive pole of the power supply. At the same time, the PLC controller in the second group of electroplastic plate shape control roller system controls the kth contactor control coil to be turned on, and then the kth path in the main circuit is connected through the contactor, so that the kth section of the conductive copper ring in the second group of electroplastic plate shape control roller system is connected to the negative pole of the power supply.

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

[0104] At this time, the PLC controller in the first group of electroplastic plate 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 section of the conductive copper ring in the first group of electroplastic plate shape control roller system is connected to the positive pole of the power supply, and the kth section of the conductive copper ring in the first group of electroplastic plate shape control roller system is connected to the negative pole of the power supply.

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

[0106] At this time, the PLC controller in the second group of electroplastic plate shape control roller system controls the mth contactor control coil to be turned on, and then the mth path in the main circuit is connected through the contactor, so that the mth section of the conductive copper ring in the second group of electroplastic plate shape control roller system is connected to the positive pole of the power supply. At the same time, the PLC controller in the first group of electroplastic plate shape control roller system controls the kth contactor control coil to be turned on, and then the kth path in the main circuit is connected through the contactor, so that the kth section of the conductive copper ring in the first group of electroplastic plate shape control roller system is connected to the negative pole of the power supply.

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

[0108] At this time, the PLC controller in the second group of electroplastic plate shape control roller system controls the mth and kth contactor control coils to be turned on, and then the mth and kth paths in the main circuit are connected through the contactor, so that the mth section of the conductive copper ring in the second group of electroplastic plate shape control roller system is connected to the positive pole of the power supply, and the kth section of the conductive copper ring in the second group of electroplastic plate shape control roller system is connected to the negative pole of the power supply.

[0109] ⑤ When there are multiple shape defects at the same longitudinal position on the strip surface, the control logic of the conductive copper ring circuits on the two sets of electroplastic shape control roller systems is similar to ①-④. It is necessary to ensure that all the conductive copper rings on the same electroplastic shape control roller system are connected to the same pole of the power supply, and all the conductive copper rings on the other electroplastic shape control roller system are connected to the opposite pole of the power supply. The control circuits of the two sets of electroplastic deformation control roller systems must communicate with each other and coordinate control to ensure that the conductive copper rings on the two sets of electroplastic deformation control roller systems are respectively connected to the two opposite polarity electrodes of the power supply.

[0110] The electroplastic plate shape control roller system mentioned in the present method includes a plate shape control roller core shaft 1, and the two ends of the plate shape control roller core shaft 1 are respectively inserted into the bearing seat 4 for fixation, and the outer walls of the two ends of the plate shape control roller core shaft 1 are respectively sleeved with conductive rotary joints 10, and the outer wall of the middle part of the plate shape control roller core shaft 1 is sleeved with a plurality of conductive copper rings 2, and insulating ceramic rings 3 are arranged between adjacent conductive copper rings 2, so as to isolate the conductive copper rings 2, and a plurality of channels 11 are opened inside the plate shape control roller core shaft 1, and insulated wires 5 are arranged in the channels 11, one end of the insulated wire 5 is connected to the inner wall of the conductive copper ring 2, and the other end is connected to the conductive rotary joint 10 for current transmission, and the conductive rotary joint 10 is connected to the main circuit and the control circuit, and is used to realize the on-off control of different conductive copper rings 2.

[0111] The main circuit includes 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 respectively connected to one end of the first multi-way contactor 701, and the other end of the first multi-way contactor 701 is connected to the conductive rotary joint 10 at one end of the plate shape control roller core shaft 1. The negative pole of the power supply 8 is connected to one end of the multi-way thermal relay heating coil 704, and the other end of the multi-way thermal relay heating coil 704 is connected to one end of the second multi-way contactor 703, and the other end of the second multi-way contactor 703 is connected to the conductive rotary joint 10 at the other end of the plate shape control roller core shaft 1. The conductive rotary joints 10 at both ends of the plate shape control roller core shaft 1 are respectively connected to the corresponding conductive copper rings 2 through insulated wires 5. A multi-way fuse 702 is provided on the line connecting the positive pole of the power supply 8 in the main circuit with the first multi-way contactor 701 to protect the normal operation of the main circuit.

[0112] The control circuit includes 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 to one end of SB1-SB3 of the input master button 905, and the other ends of SB1-SB3 of the input master button 905 are connected to the pin COM of the PLC controller 901; the pin COM0 of the PLC controller 901 is connected to one end of the output circuit fuse 904, and the other end of the output circuit fuse 904 is connected to the positive electrode of the power supply 8, and the PLC controller 9 Pins Y000-Y00n of 01 are respectively connected to one end of KM1-KMn in the multi-way contactor control coil 902, and pins Y00(n+1)-Y00(2n) of the PLC controller 901 are respectively connected to one end of KM1a-KMna in the multi-way contactor control coil 902, and the other end of KM1a-KMna in the multi-way contactor control coil 902 is respectively connected to one end of KH1a-KHna in the multi-way thermal relay 903, and 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 both connected to 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 invention and are not intended to limit them. Any modification or equivalent replacement that does not deviate from the spirit and scope of the present invention shall be included in the scope of the technical solutions of the present invention.

Claims

1. An electroplastic rolling method with independent control of transverse zones, characterized in that: The steps include: S1: A matrix of point temperature measuring instruments is arranged along the strip width direction at the entrance of the rolling mill to realize the temperature measurement in the strip width direction at the entrance of the deformation zone; a flatness meter is arranged at the exit of the rolling mill as an online detection method for flatness defects; two sets of electroplastic flatness control roller systems are arranged at the entrance of the rolling deformation zone, and the conductive copper rings in the two sets of electroplastic flatness control roller systems are arranged alternately along the strip width direction, and guide rollers are provided on the front and rear sides of the electroplastic flatness control roller system to ensure that the outer surface of the conductive copper ring in the electroplastic flatness control roller system is always in good contact with the strip; S2: According to the actual measurement results of the strip shape by the shape meter, the shape closed-loop control algorithm of the influence matrix method is used to determine the resistance of the electroplastic shape control roller system to adjust the strip deformation, and then the local heating temperature T of the electroplastic shape control roller system is determined based on the strip deformation resistance-temperature rheological curve. f ; S3: According to the plate shape closed-loop control algorithm and the strip width, determine the serial number i of the conductive copper ring that needs to be electrically heated in the two sets of plate shape control roller systems l and i r , thereby determining the connection mode of the control circuits in the two sets of plate shape control roller systems; S4: Use the control circuit to l and i r The conductive copper ring that needs to be heated is subjected to pulse power supply heating control, temperature feedback is realized according to the temperature measuring instrument matrix, and the pulse power supply voltage, current, pulse frequency and duty cycle are determined based on the electric pulse heating equation to realize local electric heating temperature control of the strip; S5: Perform rolling control according to the S2-S4 cycle to achieve local heating or softening of the strip, change the metal deformation resistance in the rolling deformation zone, and achieve a closed loop of plate shape.

2. The electroplastic rolling method with independent control of transverse zones according to claim 1, characterized in that: The strip deformation resistance-temperature rheological curve in step S2 is obtained by using the experimental data fitting method, which satisfies: where σ s is the strip deformation resistance, α is the material coefficient, κ is the deflection coefficient, and T is the temperature; Taking 1-5th order Legendre polynomials as the basic mode of flatness deviation (f1(y), f2(y), f3(y), f4(y), f5(y)), the flatness deviation is decomposed into 1-5th order Legendre polynomials, namely: Δσ(y)=Δa1f1(y)+Δa2f2(y)+Δa3f3(y)+Δa4f4(y)+Δa5f5(y) (2) The influence function theory is used to adjust the performance of the flatness control mechanism. It is considered that the influence of a single flatness control mechanism on each flatness is a weighted linear combination of the basic modes of flatness deviation: 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) Then the shape deviation influence capacity of each shape control mechanism including the electroplastic shape control roller means for online regulation of strip plastic deformation resistance is: Rearranging the above formula yields: The goal of flatness control is to minimize the residual deviation of the flatness after control, that is: R=Δσ(y)-Δσ i (y)≈0 (5) Substituting equations (3) and (4) into equation (5), we can obtain the following relationship: Thus, the relationship between the strip plastic deformation resistance and the longitudinal residual stress deviation is established, where: Δa i (i=1,2,3,4,5) is the characteristic parameter of plate shape deviation, c ij is the influence matrix coefficient, which refers to the influence coefficient of the change of the unit adjustment amount of the plate shape control mechanism in the jth rolling mill on the i-th plate shape basic mode (i=1,2,3,4,5); n means that the rolling mill has a total of n types of flatness control methods, and the mth type is the flatness control method of electro-plastic regulation of strip plastic deformation resistance. Δu j (j=1,2,…m…,n-1,n) is the adjustment amount of each plate shape control means, Δu m Indicates the change in plastic deformation resistance at the local position corresponding to the strip defect; After determining the deviation Δσ(y) between the target shape and the measured shape, the change in the strip plastic deformation resistance Δu is determined according to equations (2) and (6): m , and then combined with formula (1), the local strip temperature T after being controlled by the electroplastic shape control roller system is determined according to the current strip temperature and deformation resistance. f .

3. The electroplastic rolling method with independent control of transverse zones according to claim 2, characterized in that: The implementation form of step S3 is: the number of conductive copper rings in the two sets of electroplastic plate shape control roller systems is an even number, and the width direction is symmetrically arranged about the center axis of the strip. When the center of the strip is taken as the origin of the horizontal coordinate, the width of the conductive copper ring is b d , the width of the insulating ceramic ring is b j , Then the scope set of the conductive copper ring in the first group of electroplastic plate shape control roller posture is A, which contains n scopes: {[and s1 ,and s1 +b d ],[and s2 ,and s2 +b d ],……,[and s(n-1) ,and s(n-1) +b d ],[and sn ,and sn +b d ]} The scope set of the insulating ceramic rings in the first group of electroplastic shape control rollers is B, which contains n-1 scopes: The scope set of the conductive copper rings in the second group of electroplastic shape control rollers is C, which contains n-1 segments of scope: {[and x1 ,and x1 +b d ],[and x2 ,and x2 +b d ],……,[and x(n-2) ,and x(n-2) +b d ],[and x(n-1) ,and x(n-1) +b d ]} The scope set of the insulating ceramic ring in the second group of electroplastic shape control roller system is D, which contains n scopes:

4. The electroplastic rolling method with independent control of transverse zones according to claim 3, characterized in that: When the left limit position of the strip shape defect is located in the mth conductive copper ring interval y of the first set of electro-plastic shape control roller system ql ∈[y sm ,y sm +b d ], then i l = m, the right limit position is located in the kth conductive copper ring section y in the second set of electroplastic plate shape control roller system qr ∈[y xk ,y xk +b d ], then i r = k; At this time, the PLC controller in the first group of electroplastic plate shape control roller system controls the mth contactor control coil to be turned on, and then the mth path in the main circuit is connected through the contactor, so that the mth section of the conductive copper ring in the first group of electroplastic plate shape control roller system is connected to the positive pole of the power supply. At the same time, the PLC controller in the second group of electroplastic plate shape control roller system controls the kth contactor control coil to be turned on, and then the kth path in the main circuit is connected through the contactor, so that the kth section of the conductive copper ring in the second group of electroplastic plate shape control roller system is connected to the negative pole of the power supply.

5. The electroplastic rolling method with independent control of transverse zones according to claim 3, characterized in that: When the left limit position of the strip shape defect is located in the mth conductive copper ring interval y of the first set of electroplastic shape control roller system ql ∈[y sm ,y sm +b d ], then i l = m, the right limit position is located in the kth section of the conductive copper ring interval y in the first group of electroplastic plate shape control roller system qr ∈[y sk ,y sk +b d ], then i r = k, At this time, the PLC controller in the first group of electroplastic plate 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 section of the conductive copper ring in the first group of electroplastic plate shape control roller system is connected to the positive pole of the power supply, and the kth section of the conductive copper ring in the first group of electroplastic plate shape control roller system is connected to the negative pole of the power supply.

6. The electroplastic rolling method with independent control of transverse zones according to claim 3, characterized in that: When the left limit position of the strip shape defect is located in the mth conductive copper ring interval y of the second set of electroplastic shape control roller system ql ∈[y xm ,y xm +b d ], then i l = m, the right limit position is located in the kth section of the conductive copper ring interval y in the first group of electroplastic plate shape control roller system qr ∈[y sk ,y sk +b d ], then i r = k, At this time, the PLC controller in the second group of electroplastic plate shape control roller system controls the mth contactor control coil to be turned on, and then the mth path in the main circuit is connected through the contactor, so that the mth section of the conductive copper ring in the second group of electroplastic plate shape control roller system is connected to the positive pole of the power supply. At the same time, the PLC controller in the first group of electroplastic plate shape control roller system controls the kth contactor control coil to be turned on, and then the kth path in the main circuit is connected through the contactor, so that the kth section of the conductive copper ring in the first group of electroplastic plate shape control roller system is connected to the negative pole of the power supply.

7. The electroplastic rolling method with independent control of transverse zones according to claim 3, characterized in that: When the left limit position of the strip shape defect is located in the mth conductive copper ring interval y of the second set of electroplastic shape control roller system ql ∈[y xm ,y xm +b d ], then i l = m, the right limit position is located in the kth section of the conductive copper ring interval y in the second set of electroplastic plate shape control roller system qr ∈[y xk ,y xk +b d ], then i r = k, At this time, the PLC controller in the second group of electroplastic plate shape control roller system controls the mth and kth contactor control coils to be turned on, and then the mth and kth paths in the main circuit are connected through the contactor, so that the mth section of the conductive copper ring in the second group of electroplastic plate shape control roller system is connected to the positive pole of the power supply, and the kth section of the conductive copper ring in the second group of electroplastic plate shape control roller system is connected to the negative pole of the power supply.

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