Electroplastic rolling method capable of implementing independent control in transverse zones

Abstract

An electroplastic rolling method capable of implementing independent control in transverse zones. The positions of conductive copper rings in respective electroplastic shape control roller systems are determined on the basis of the positions of strip shape defects; by means of a control circuit, it is ensured that two electroplastic shape control roller systems and a strip form an electrical loop, such that electroplastic regulation is implemented in transverse zones along the strip; a variation in the plastic deformation resistance of the strip is determined on the basis of an impact matrix method, and a local heating temperature of the electroplastic shape control roller systems is then determined in view of a deformation resistance and temperature rheological curve relationship of the strip; and online temperature regulation in the direction of width of the strip is realized at an entry of a deformation zone by means of the electroplastic shape control roller systems.

Description

A transversely partitioned, independently controlled electroplastic rolling method Technical Field

[0001] This invention belongs to the field of metal sheet and strip rolling technology, and particularly relates to an electroplastic rolling method with independent control of transverse partitions. Background Technology

[0002] Strip shape is an important indicator of strip quality. Rolling pressure distribution is the fundamental factor affecting strip shape. Rolling pressure distribution is affected by factors such as the transverse distribution of roll gap, front and rear tensile stress, and strip plasticity parameters. Conventional rolling generally uses methods such as bending rolls, shifting rolls (roll type), segmented adjustment of support rolls, segmented cooling, and high tension to control strip shape. However, conventional strip shape control methods have limited control range and are difficult to effectively control complex and high-order strip shapes. In particular, as strip rolling develops towards extremely thin, extremely hard, extremely wide strips and the control of center convexity towards the edge, the production process is prone to complex and high-order ripples and coupling phenomena of flatness and cross-sectional profile control.

[0003] As can be seen from the above, there is an urgent need for an electroplastic rolling method that allows for independent control of transverse partitions to control the sheet shape. Summary of the Invention

[0004] To address the shortcomings and deficiencies of existing technologies, a transversely partitioned, independently controlled electroplastic rolling method is provided. This method can solve the problem that existing conventional shape control methods have limited control ranges and are difficult to effectively achieve complex and high-order shape control.

[0005] To achieve the objective of this invention, a transversely partitioned, independently controlled electroplastic rolling method is provided, comprising the following steps:

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

[0007] S2: Based on the actual measurement results of the strip shape by the strip shape measuring instrument, and according to the strip shape closed-loop control algorithm of the influence matrix method, the resistance of the electroplastic strip shape control roller system used to adjust the strip deformation is determined. Then, based on the strip deformation resistance-temperature rheological curve, the local heating temperature of the electroplastic strip shape control roller system is determined. ;

[0008] S3: Based on the strip shape closed-loop control algorithm and strip width, determine the serial numbers of the conductive copper rings that need to be electrically heated in the two sets of strip shape control roller systems. and This allows us to determine the connection method of the control circuits in the two sets of plate-shaped control roller systems;

[0009] S4: Use the control circuit to control the sequence number... and The conductive copper ring that needs to be heated is controlled by pulse power supply. Temperature feedback is achieved based on the temperature measuring instrument matrix. The voltage, current, pulse frequency and duty cycle of the pulse power supply are determined based on the electric pulse heating equation to achieve local electric heating temperature control of the strip.

[0010] S5: Rolling control is performed 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 realize the plate shape closed loop.

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

[0012] (1)

[0013] in For strip deformation resistance, It is the material coefficient. It is the offset coefficient. It's temperature;

[0014] Using Legendre polynomials of degrees 1-5 as the basic model for plate shape deviation The plate shape deviation is decomposed into Legendre polynomials of degree 1-5, namely:

[0015] (2)

[0016] The performance adjustment of the plate shape control mechanism is carried out using the influence function theory. It is believed that the influence of a single plate shape control mechanism on each plate shape is a weighted linear combination of the basic plate shape deviation patterns.

[0017] (3)

[0018] The shape deviation influence capability of each shape control mechanism in the electroplastic shape control roller method, which includes online control of strip plastic deformation resistance, is as follows:

[0019]

[0020] Simplifying the above equation, we get:

[0021] (4)

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

[0023] (5)

[0024] Substituting equations (3) and (4) into equation (5) yields the following relationship:

[0025] (6)

[0026] This establishes the relationship between the strip's resistance to plastic deformation and the longitudinal residual stress deviation, where:

[0027] ) represents the characteristic parameter of plate shape deviation.

[0028] The influence matrix coefficients refer to the influence coefficients of the unit adjustment amount change of the j-th plate shape control mechanism of the rolling mill on the i-th basic plate shape mode (i=1,2,3,4,5).

[0029] n represents the total number of strip shape control methods in the rolling mill, where the m-th method is the electroplastic regulation of the strip's resistance to plastic deformation. (j=1,2,…m…,n-1,n) represents the adjustment amount of each plate shape control method. This indicates the change in plastic deformation resistance at the local location corresponding to a defect in the strip;

[0030] Determine the deviation between the target plate shape and the measured plate shape. Then, the change in resistance to plastic deformation of the strip is determined according to equations (2) and (6). Then, combined with equation (1), the local strip temperature after being regulated by the electroplastic sheet shape control roller system is determined based on the current strip temperature and deformation resistance. .

[0031] As a further improvement to the above scheme, step S3 is implemented as follows: the number of conductive copper rings in the two sets of electroplastic sheet shape control roller systems is even, and they are arranged symmetrically about the center axis of the strip in the width direction. When the center of the strip is taken as the origin of the abscissa, the width of the conductive copper rings is... The width of the insulating ceramic ring is Then, the set of domains of action of the conductive copper ring in the first group of electroplastic sheet shape control rollers is A, which contains n domains:

[0032]

[0033] The set of domains of action of the insulating ceramic ring in the first group of electroplastic plate shape control rollers is B, which contains n-1 domains:

[0034]

[0035] The set of active domains of the conductive copper rings in the second group of electroplastic sheet shape control rollers is C, which contains n-1 active domain segments:

[0036]

[0037] The set of domains of the insulating ceramic ring in the second group of electroplastic plate shape control roller system is D, which contains n domains:

[0038] .

[0039] As a further improvement to the above scheme, when the left limit position of the strip shape defect is located in the m-th conductive copper ring section of the first group of electroplastic shape control roller system... ,but The right limit position is located in the k-th conductive copper ring section of the second group of electroplastic sheet shape control roller system. ,but ;

[0040] At this time, the PLC controller in the first group of electroplastic sheet shape control roller system controls the m-th contactor control coil to be turned on, and then connects the m-th circuit in the main circuit through the contactor, so that the m-th conductive copper ring in the first group of electroplastic sheet shape control roller system is connected to the positive terminal of the power supply. At the same time, the PLC controller in the second group of electroplastic sheet shape control roller system controls the k-th contactor control coil to be turned on, and then connects the k-th circuit in the main circuit through the contactor, so that the k-th conductive copper ring in the second group of electroplastic sheet shape control roller system is connected to the negative terminal of the power supply.

[0041] As a further improvement to the above scheme, when the left limit position of the strip shape defect is located in the m-th conductive copper ring section of the first group of electroplastic shape control roller system...

[0042] ,but The right limit position is located in the k-th conductive copper ring section of the first group of electroplastic sheet shape control roller system.

[0043] ,but ,

[0044] At this time, the PLC controller in the first group of electroplastic sheet shape control roller system controls the control coils of the m-th and k-th contactors to be turned on, and then the m-th and k-th circuits in the main circuit are connected through the contactors, so that the m-th conductive copper ring in the first group of electroplastic sheet shape control roller system is connected to the positive terminal of the power supply, and the k-th conductive copper ring in the first group of electroplastic sheet shape control roller system is connected to the negative terminal of the power supply.

[0045] As a further improvement to the above scheme, when the left limit position of the strip shape defect is located in the m-th conductive copper ring section of the second group of electroplastic shape control roller system... ,but The right limit position is located in the k-th conductive copper ring section of the first group of electroplastic sheet shape control roller system. ,but ,

[0046] At this point, the PLC controller in the second group of electroplastic sheet shape control roller system controls the m-th contactor control coil to be turned on, thereby connecting the m-th circuit in the main circuit through the contactor, so that the m-th conductive copper ring in the second group of electroplastic sheet shape control roller system is connected to the positive terminal of the power supply. At the same time, the PLC controller in the first group of electroplastic sheet shape control roller system controls the k-th contactor control coil to be turned on, thereby connecting the k-th circuit in the main circuit through the contactor, so that the k-th conductive copper ring in the first group of electroplastic sheet shape control roller system is connected to the negative terminal of the power supply.

[0047] As a further improvement to the above scheme, when the left limit position of the strip shape defect is located in the m-th conductive copper ring section of the second group of electroplastic shape control roller system... ,but The right limit position is located in the k-th conductive copper ring section of the second group of electroplastic sheet shape control roller system.

[0048] ,but ,

[0049] At this point, the PLC controller in the second group of electroplastic sheet shape control roller system controls the control coils of the m and k contactors to be turned on, and then connects the m and k circuits in the main circuit through the contactors, so that the m section of conductive copper ring in the second group of electroplastic sheet shape control roller system is connected to the positive terminal of the power supply, and the k section of conductive copper ring in the second group of electroplastic sheet shape control roller system is connected to the negative terminal of the power supply.

[0050] The beneficial effects of this invention are:

[0051] Compared with existing technologies, this invention provides a transversely zoned electroplastic rolling method that clarifies the control logic and method of transversely zoned electroplastic shape control with the temperature at the location of strip shape defects as the control target. It considers the coupling effect of strip electroplasticity changes with other shape control methods, determines the position of the conductive copper ring in each electroplastic shape control roll system based on the location of shape defects, and ensures that the two sets of electroplastic shape control roll systems and the strip form an electrical loop through the control circuit, achieving transversely zoned electroplasticity adjustment along the strip. Furthermore, it determines the change in strip plastic deformation resistance based on the influence matrix method, and then, combined with the strip deformation resistance-temperature rheological curve relationship, determines the local strip temperature after shape control using the electroplastic shape control roll system. Combined with a matrix of point thermometers, it achieves online temperature control in the strip width direction at the deformation zone entrance through the electroplastic shape control roll system, leveraging the control capability of electroplasticity on shape and the flexibility of zoned control. This provides a more powerful shape control method for rolling extremely thin, extremely hard, and extremely wide high-quality strips, which is beneficial for improving strip quality. Attached Figure Description

[0052] Figure 1 is a schematic diagram of the system composition and working principle of the electroplastic rolling method with independent control of transverse partitions;

[0053] Figure 2 is a schematic diagram of the method for determining the serial number of the conductive copper ring in this invention;

[0054] Figure 3 is a front view of the method for determining the serial number of the conductive copper ring in this invention;

[0055] Figure 4 is a top view of the method for determining the serial number of the conductive copper ring in this invention;

[0056] Figure 5 is a front view of the equivalent circuit formed by two sets of electroplastic plate shape control roller systems near the defect location in this invention;

[0057] Figure 6 is a top view of the equivalent circuit formed by two sets of electroplastic plate shape control roller systems near the defect location in this invention.

[0058] Figure 7 is a schematic diagram of the electroplastic plate-type control roller system in this invention;

[0059] Figure 8 is a top view of the electroplastic plate-shaped control roller system in this invention;

[0060] Figure 9 is a cross-sectional view of AA in Figure 8;

[0061] Figure 10 is an enlarged schematic diagram of circle B in Figure 9;

[0062] Figure 11 is a schematic diagram of the main circuit and hardware connection of the electroplastic plate-type control roller system in this invention.

[0063] Figure 12 is a schematic diagram of the control circuit and hardware connection of the electroplastic sheet-type control roller system in this invention.

[0064] Among them, 1-plate shape control roller core shaft; 2-conductive copper ring; 3-insulating ceramic ring; 4-bearing seat; 5-insulating wire; 6-shock-absorbing rubber sleeve; 7-insulating ceramic roller sleeve; 8-power supply; 9-key; 10-conductive rotary joint; 11-channel; 701-multi-channel contactor; 702-multi-channel fuse; 703-multi-channel contactor; 704-multi-channel thermal relay heating coil; 901-PLC controller; 902-multi-channel contactor control coil; 903-multi-channel thermal relay; 904-output circuit fuse; 905-input master button. Detailed Implementation

[0065] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:

[0066] As shown in Figures 1-12, the present invention provides an electroplastic rolling method with independent control of transverse partitions, comprising the following steps:

[0067] S1: A matrix of point temperature measuring instruments is arranged along the width of the strip at the mill entrance to measure the temperature of the strip in the width direction at the entrance of the deformation zone; a shape measuring instrument is arranged at the mill exit as an online detection method for shape defects; two sets of electroplastic shape control roll systems are arranged at the entrance of the rolling deformation zone, and the conductive copper rings in the two sets of electroplastic shape control roll systems are arranged alternately along the width direction of the strip. Guide rollers are set on the front and rear sides of the electroplastic shape control roll system to ensure that the outer surface of the conductive copper rings in the electroplastic shape control roll system is always in good contact with the strip;

[0068] S2: Based on the actual measurement results of the strip shape by the strip shape measuring instrument, and according to the strip shape closed-loop control algorithm of the influence matrix method, the resistance of the electroplastic strip shape control roller system used to adjust the strip deformation is determined. Then, based on the strip deformation resistance-temperature rheological curve, the local heating temperature of the electroplastic strip shape control roller system is determined. ;

[0069] S3: Based on the strip shape closed-loop control algorithm and strip width, determine the serial numbers of the conductive copper rings that need to be electrically heated in the two sets of strip shape control roller systems. and This allows us to determine the connection method of the control circuits in the two sets of plate-shaped control roller systems;

[0070] S4: Use the control circuit to control the sequence number... and The conductive copper ring that needs to be heated is controlled by pulse power supply. Temperature feedback is achieved based on the temperature measuring instrument matrix. The voltage, current, pulse frequency and duty cycle of the pulse power supply are determined based on the electric pulse heating equation to achieve local electric heating temperature control of the strip.

[0071] S5: Rolling control is performed 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 realize the plate shape closed loop.

[0072] In step S2, the strip deformation resistance-temperature rheological curve is obtained by fitting experimental data and satisfies the following:

[0073] (1)

[0074] in For strip deformation resistance, It is the material coefficient. It is the offset coefficient. It's temperature;

[0075] Using Legendre polynomials of degrees 1-5 as the basic model for plate shape deviation The plate shape deviation is decomposed into Legendre polynomials of degree 1-5, namely:

[0076] (2)

[0077] The performance adjustment of the plate shape control mechanism is carried out using the influence function theory. It is believed that the influence of a single plate shape control mechanism on each plate shape is a weighted linear combination of the basic plate shape deviation patterns.

[0078] (3)

[0079] The shape deviation influence capability of each shape control mechanism in the electroplastic shape control roller method, which includes online control of strip plastic deformation resistance, is as follows:

[0080]

[0081] Simplifying the above equation, we get:

[0082] (4)

[0083] The objective of plate shape control is to minimize the residual deviation of the plate shape after control, that is:

[0084] (5)

[0085] Substituting equations (3) and (4) into equation (5) yields the following relationship:

[0086] (6)

[0087] This establishes the relationship between the strip's resistance to plastic deformation and the longitudinal residual stress deviation, where:

[0088] (i=1,2,3,4,5) are the characteristic parameters of plate shape deviation.

[0089] The influence matrix coefficient refers to the influence coefficient of the unit adjustment amount change of the j-th plate shape control mechanism of the rolling mill on the i-th basic plate shape mode (i=1,2,3,4,5).

[0090] n represents the total number of strip shape control methods in the rolling mill, where the m-th method is the electroplastic regulation of the strip's resistance to plastic deformation.

[0091] (j=1,2,…m…,n-1,n) represents the adjustment amount of each plate shape control method. This indicates the change in plastic deformation resistance at the local location corresponding to a defect in the strip;

[0092] Determine the deviation between the target plate shape and the measured plate shape. Then, the change in resistance to plastic deformation of the strip is determined according to equations (2) and (6). Then, combined with equation (1), the local strip temperature after being regulated by the electroplastic sheet shape control roller system is determined based on the current strip temperature and deformation resistance. .

[0093] Furthermore, step S3 is implemented as follows: the number of conductive copper rings in the two sets of electroplastic sheet shape control roller systems is even, and they are arranged symmetrically about the center axis of the strip in the width direction. When the center of the strip is taken as the origin of the abscissa, the width of the conductive copper rings is... The width of the insulating ceramic ring is ,

[0094] Then, the set of domains of action of the conductive copper ring in the first group of electroplastic sheet shape control rollers is A, which contains n domains:

[0095]

[0096] The set of domains of action of the insulating ceramic ring in the first group of electroplastic plate shape control rollers is B, which contains n-1 domains:

[0097]

[0098] The set of active domains of the conductive copper rings in the second group of electroplastic sheet shape control rollers is C, which contains n-1 active domain segments:

[0099]

[0100] The set of domains of the insulating ceramic ring in the second group of electroplastic plate shape control roller system is D, which contains n domains:

[0101] .

[0102] ① When the left limit position of the strip shape defect is located in the m-th conductive copper ring section of the first group of electroplastic shape control roller system ,but The right limit position is located in the k-th conductive copper ring section of the second group of electroplastic sheet shape control roller system. ,but ;

[0103] At this time, the PLC controller in the first group of electroplastic sheet shape control roller system controls the m-th contactor control coil to be turned on, and then connects the m-th circuit in the main circuit through the contactor, so that the m-th conductive copper ring in the first group of electroplastic sheet shape control roller system is connected to the positive terminal of the power supply. At the same time, the PLC controller in the second group of electroplastic sheet shape control roller system controls the k-th contactor control coil to be turned on, and then connects the k-th circuit in the main circuit through the contactor, so that the k-th conductive copper ring in the second group of electroplastic sheet shape control roller system is connected to the negative terminal of the power supply.

[0104] ② When the left limit position of the strip shape defect is located in the m-th conductive copper ring section of the first group of electroplastic strip shape control roller system ,but The right limit position is located in the k-th conductive copper ring section of the first group of electroplastic sheet shape control roller system. ,but ,

[0105] At this time, the PLC controller in the first group of electroplastic sheet shape control roller system controls the control coils of the m-th and k-th contactors to be turned on, and then the m-th and k-th circuits in the main circuit are connected through the contactors, so that the m-th conductive copper ring in the first group of electroplastic sheet shape control roller system is connected to the positive terminal of the power supply, and the k-th conductive copper ring in the first group of electroplastic sheet shape control roller system is connected to the negative terminal of the power supply.

[0106] ③ When the left limit position of the strip shape defect is located in the m-th conductive copper ring section of the second group of electroplastic strip shape control roller system ,but The right limit position is located in the k-th conductive copper ring section of the first group of electroplastic sheet shape control roller system. ,but ,

[0107] At this point, the PLC controller in the second group of electroplastic sheet shape control roller system controls the m-th contactor control coil to be turned on, thereby connecting the m-th circuit in the main circuit through the contactor, so that the m-th conductive copper ring in the second group of electroplastic sheet shape control roller system is connected to the positive terminal of the power supply. At the same time, the PLC controller in the first group of electroplastic sheet shape control roller system controls the k-th contactor control coil to be turned on, thereby connecting the k-th circuit in the main circuit through the contactor, so that the k-th conductive copper ring in the first group of electroplastic sheet shape control roller system is connected to the negative terminal of the power supply.

[0108] ④ When the left limit position of the strip shape defect is located in the m-th section of the conductive copper ring in the second group of electroplastic shape control roller system ,but The right limit position is located in the k-th conductive copper ring section of the second group of electroplastic sheet shape control roller system. ,but ,

[0109] At this point, the PLC controller in the second group of electroplastic sheet shape control roller system controls the control coils of the m and k contactors to be turned on, and then connects the m and k circuits in the main circuit through the contactors, so that the m section of conductive copper ring in the second group of electroplastic sheet shape control roller system is connected to the positive terminal of the power supply, and the k section of conductive copper ring in the second group of electroplastic sheet shape control roller system is connected to the negative terminal of the power supply.

[0110] ⑤ When there are multiple sheet shape defects at the same longitudinal position on the strip surface, the control logic of the conductive copper ring circuit on the two sets of electroplastic sheet shape control roller systems is similar to ①-④. It is necessary to ensure that all conductive copper rings on the same electroplastic sheet shape control roller system are connected to the same pole of the power supply, and all conductive copper rings on the other electroplastic sheet 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 poles of the power supply.

[0111] The electroplastic plate-shaped control roller system mentioned in this method includes a plate-shaped control roller mandrel 1. Both ends of the plate-shaped control roller mandrel 1 are inserted into bearing seats 4 for fixation. Conductive rotary joints 10 are respectively sleeved on the outer walls of both ends of the plate-shaped control roller mandrel 1. Multiple conductive copper rings 2 are sleeved on the outer wall of the middle part of the plate-shaped control roller mandrel 1. Insulating ceramic rings 3 are set between adjacent conductive copper rings 2 to isolate the conductive copper rings 2. Multiple channels 11 are opened inside the plate-shaped control roller mandrel 1. Insulated wires 5 are set in each channel 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. The conductive rotary joint 10 is connected to the main circuit and the control circuit to realize the on and off power control of different conductive copper rings 2.

[0112] The main circuit includes a power supply 8, a first multi-channel contactor 701, a second multi-channel contactor 703, and a multi-channel thermal relay heating coil 704. The positive terminal of the power supply 8 is connected to one end of the first multi-channel contactor 701, and the other end of the first multi-channel contactor 701 is connected to the conductive rotary joint 10 at one end of the plate-shaped control roller spindle 1. The negative terminal of the power supply 8 is connected to one end of the multi-channel thermal relay heating coil 704, and the other end of the multi-channel thermal relay heating coil 704 is connected to one end of the second multi-channel contactor 703. The other end of the second multi-channel contactor 703 is connected to the conductive rotary joint 10 at the other end of the plate-shaped control roller spindle 1. The conductive rotary joints 10 at both ends of the plate-shaped control roller spindle 1 are connected to the corresponding conductive copper rings 2 through insulated wires 5. A multi-channel fuse 702 is installed on the line connecting the positive terminal of the power supply 8 to the first multi-channel contactor 701 in the main circuit to protect the normal operation of the main circuit.

[0113] The control circuit includes a power supply 8, a PLC controller 901, a multi-channel contactor control coil 902, a multi-channel thermal relay 903, an output circuit fuse 904, and an input master button 905. 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 end of SB1-SB3 of the input master button 905 is connected to pin COM of the PLC controller 901. 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 terminal of the power supply 8. Pins Y000-Y00n of PLC controller 901 are connected to one end of KM1-KMn in multi-channel contactor control coil 902, respectively. Pins Y00(n+1)-Y00(2n) of PLC controller 901 are connected to one end of KM1a-KMna in multi-channel contactor control coil 902, respectively. The other end of KM1a-KMna in multi-channel contactor control coil 902 is connected to one end of KH1a-KHna in multi-channel thermal relay 903, respectively. The other end of KM1-KMn in multi-channel contactor control coil 902 and the other end of KH1a-KHna in multi-channel thermal relay 903 are both connected to the negative pole of power supply 8.

[0114] 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 modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of the technical solutions of the present invention.

Claims

1. A method of transverse zonal independent control electroplastic rolling, characterized in that: Includes the following steps: S1: A matrix of point temperature measuring instruments is arranged along the width of the strip at the mill entrance to measure the temperature of the strip in the width direction at the entrance of the deformation zone; a shape measuring instrument is arranged at the mill exit as an online detection method for shape defects; two sets of electroplastic shape control roll systems are arranged at the entrance of the rolling deformation zone, and the conductive copper rings in the two sets of electroplastic shape control roll systems are arranged alternately along the width direction of the strip. Guide rollers are set on the front and rear sides of the electroplastic shape control roll system to ensure that the outer surface of the conductive copper rings in the electroplastic shape control roll system is always in good contact with the strip; S2: Based on the actual measurement results of the strip shape by the strip shape measuring instrument, and according to the strip shape closed-loop control algorithm of the influence matrix method, the resistance of the electroplastic strip shape control roller system used to adjust the strip deformation is determined. Then, based on the strip deformation resistance-temperature rheological curve, the local heating temperature of the electroplastic strip shape control roller system is determined. ； S3: Based on the strip shape closed-loop control algorithm and strip width, determine the serial numbers of the conductive copper rings that need to be electrically heated in the two sets of strip shape control roller systems. and This allows us to determine the connection method of the control circuits in the two sets of plate-shaped control roller systems; S4: Use the control circuit to control the sequence number... and The conductive copper ring that needs to be heated is controlled by pulse power supply. Temperature feedback is achieved based on the temperature measuring instrument matrix. The voltage, current, pulse frequency and duty cycle of the pulse power supply are determined based on the electric pulse heating equation to achieve local electric heating temperature control of the strip. S5: Rolling control is performed 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 realize the plate shape closed loop.

2. The transverse zoned independent control electioplastic rolling method according to claim 1, characterized in that: The strip deformation resistance-temperature rheological curve in step S2 is obtained by fitting experimental data and satisfies the following: （1） in for the strip deformation resistance, is a material coefficient, It is the offset coefficient. It's temperature; Using Legendre polynomials of degrees 1-5 as the basic model for plate shape deviation The plate shape deviation is decomposed into Legendre polynomials of degree 1-5, namely: （2） The performance adjustment of the plate shape control mechanism is carried out using the influence function theory. It is believed that the influence of a single plate shape control mechanism on each plate shape is a weighted linear combination of the basic plate shape deviation patterns. （3） The shape deviation influence capability of each shape control mechanism in the electroplastic shape control roller method, which includes online control of strip plastic deformation resistance, is as follows: ； Simplifying the above equation, we get: （4） The objective of plate shape control is to minimize the residual deviation of the plate shape after control, that is: （5） Substituting equations (3) and (4) into equation (5) gives the following relationship: （6） This establishes the relationship between the strip's resistance to plastic deformation and the longitudinal residual stress deviation, where: (i=1,2,3,4,5) are the characteristic parameters of plate shape deviation. The influence matrix coefficient refers to the influence coefficient of the unit adjustment amount change of the j-th plate shape control mechanism of the rolling mill on the i-th basic plate shape mode (i=1,2,3,4,5). n represents the total number of strip shape control methods in the rolling mill, where the m-th method is the electroplastic regulation of the strip's resistance to plastic deformation. (j=1,2,…m…,n-1,n) represents the adjustment amount of each plate shape control method. This indicates the change in plastic deformation resistance at the local location corresponding to a defect in the strip; In determining the target plate shape and the measured plate shape deviation Then, the change in resistance to plastic deformation of the strip is determined according to equations (2) and (6). Then, combining equation (1), the local strip temperature after adjustment by the electroplastic sheet shape control roller system is determined based on the current strip temperature and deformation resistance. 。 3. A transverse zoned independent control electioplastic rolling method according to claim 2, characterized in that: The implementation of step S3 is as follows: the number of conductive copper rings in the two sets of electroplastic sheet shape control roller systems is even, and they are arranged symmetrically about the center axis of the strip in the width direction. When the center of the strip is taken as the origin of the abscissa, the width of the conductive copper rings is... The width of the insulating ceramic ring is , Then, the set of domains of action of the conductive copper ring in the first group of electroplastic sheet shape control rollers is A, which contains n domains: ； The set of domains of action of the insulating ceramic ring in the first group of electroplastic plate shape control rollers is B, which contains n-1 domains: ； The set of active domains of the conductive copper rings in the second group of electroplastic sheet shape control rollers is C, which contains n-1 active domain segments: ； The set of domains of the insulating ceramic ring in the second group of electroplastic plate shape control roller system is D, which contains n domains: 。 4. The transverse zoned independent control electioplastic rolling method according to claim 3, characterized in that: When the left limit position of the strip shape defect is located in the m-th conductive copper ring section of the first group of electroplastic strip shape control roller system ,but The right limit position is located in the k-th conductive copper ring section of the second group of electroplastic sheet shape control roller system. ,but ; At this time, the PLC controller in the first group of electroplastic sheet shape control roller system controls the m-th contactor control coil to be turned on, and then connects the m-th circuit in the main circuit through the contactor, so that the m-th conductive copper ring in the first group of electroplastic sheet shape control roller system is connected to the positive terminal of the power supply. At the same time, the PLC controller in the second group of electroplastic sheet shape control roller system controls the k-th contactor control coil to be turned on, and then connects the k-th circuit in the main circuit through the contactor, so that the k-th conductive copper ring in the second group of electroplastic sheet shape control roller system is connected to the negative terminal of the power supply.

5. The transverse zoned independent control electioplastic rolling method according to claim 3, characterized in that: When the left limit position of the strip shape defect is located in the m-th section of the conductive copper ring in the first group of electroplastic strip shape control roller system ,but The right limit position is located in the k-th conductive copper ring section of the first group of electroplastic sheet shape control roller system. ,but , At this time, the PLC controller in the first group of electroplastic sheet shape control roller system controls the control coils of the m-th and k-th contactors to be turned on, and then the m-th and k-th circuits in the main circuit are connected through the contactors, so that the m-th conductive copper ring in the first group of electroplastic sheet shape control roller system is connected to the positive terminal of the power supply, and the k-th conductive copper ring in the first group of electroplastic sheet shape control roller system is connected to the negative terminal of the power supply.

6. The transverse zoned independent control electioplastic rolling method according to claim 3, characterized in that: When the left limit position of the strip shape defect is located in the m-th section of the conductive copper ring in the second group of electroplastic strip shape control roller system ,but The right limit position is located in the k-th conductive copper ring section of the first group of electroplastic sheet shape control roller system. ,but , At this point, the PLC controller in the second group of electroplastic sheet shape control roller system controls the m-th contactor control coil to be turned on, thereby connecting the m-th circuit in the main circuit through the contactor, so that the m-th conductive copper ring in the second group of electroplastic sheet shape control roller system is connected to the positive terminal of the power supply. At the same time, the PLC controller in the first group of electroplastic sheet shape control roller system controls the k-th contactor control coil to be turned on, thereby connecting the k-th circuit in the main circuit through the contactor, so that the k-th conductive copper ring in the first group of electroplastic sheet shape control roller system is connected to the negative terminal of the power supply.

7. The transverse zoned independent control electioplastic rolling method according to claim 3, characterized in that: When the left limit position of the strip shape defect is located in the m-th section of the conductive copper ring in the second group of electroplastic strip shape control roller system ,but The right limit position is located in the k-th conductive copper ring section of the second group of electroplastic sheet shape control roller system. ,but , At this point, the PLC controller in the second group of electroplastic sheet shape control roller system controls the control coils of the m and k contactors to be turned on, and then connects the m and k circuits in the main circuit through the contactors, so that the m section of conductive copper ring in the second group of electroplastic sheet shape control roller system is connected to the positive terminal of the power supply, and the k section of conductive copper ring in the second group of electroplastic sheet shape control roller system is connected to the negative terminal of the power supply.

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