A cold-rolled differential thickness plate coordinated support roller, a roller profile determination method, and a rolling mill platform

Abstract

The present invention provides a matching support roller for cold-rolled differential thickness plates, a method for determining a roller profile, and a rolling mill platform. The matching support roller has a roller profile, and its shape matches the target thickness difference variation trajectory of the differential thickness plates. The roller profile is divided into n angular zones, and the n angular zones correspond to n differential thickness variation control cycles of the differential thickness plates. The platform for the cold-rolling mill for differential thickness plates adopts a bilaterally symmetrical structure, with the mill body at the very center of the platform, which is used to implement variable thickness rolling of differential thickness plates; the inlet-side thickness gauge and the outlet-side thickness gauge are used to provide real-time feedback of the plate thickness signal; the inlet-side curling roller and the outlet-side curling roller are used to implement the curling of the cold-rolled differential thickness plates; the inlet-side guide roller and the outlet-side guide roller are used to dynamically adjust the inlet-side tension value and the outlet-side tension value during the rolling process of the differential thickness plates; the outlet-side guide roller can move up and down, and the tension levels on both sides are dynamically adjusted by changing its position. The present invention can be used for cold-rolling production of differential thickness plates to mechanically match and correct the rolling trajectory of differential thickness plates.

Description

Technical Field

[0001] The invention belongs to the technical field of plate and strip rolling mills, and in particular relates to a cold-rolled differential thickness plate coordinated support roll, a roll profile determination method, and a rolling mill platform. Background Art

[0002] Due to its rolling thickness difference and one-piece forming characteristics, differential thickness plate can replace welded equal thickness plate and serve as a high-quality base material for sheet metal components in the fields of aerospace, shipbuilding and vehicles. Unlike traditional rolling, the core of differential thickness plate rolling lies in regulating the roll gap opening, adapting the differential thickness trajectory by changing the opening, and thus ensuring the stable production of differential thickness plate. Among them, the dynamic adjustment of the roll gap opening, the adaptation detection of the differential thickness trajectory, and the dynamic adjustment after the adaptation deviation are the difficulties of this technology. At the same time, in order to ensure the stability of the single plate specification of differential thickness plate, the coordination between the production links such as the pressure control, rolling control, and detection feedback of the differential thickness plate rolling mill is also extremely demanding. The excellent coordination is crucial to the stable production of differential thickness plate, especially cold-rolled differential thickness plate.

[0003] Currently, the industry has proposed various solutions to the problem of differential thickness plate production from the perspectives of rolling equipment and rolling methods. Regarding differential thickness plate rolling equipment, patents CN201520563368.9, CN201510246066.3, CN201510460213.7, and CN201520313015.3 propose various differential thickness plate rolling dies. These inventions use matching dies as the slab thickness differential forming device. However, due to the die pressing design rather than the closed arch design, their rolling capacity is limited, making them unsuitable for high-strength base metal production and high-reduction rolling.

[0004] Patent CN109759449A proposes a work roll for differential thickness plate in a single-stand twin-roll mill. The axial single roll segment has a circumferential diameter difference, which is used to replicate the differential thickness track. However, this roll profile is located above the work roll, which directly contacts the workpiece, making it susceptible to surface quality issues and roll profile damage. Furthermore, the two-roll feature of this invention makes thin plate rolling and shape control difficult.

[0005] From the perspective of differential thickness plate rolling methods, Patent CN201210152272.4 proposes a thickness difference control method for differential thickness plate rolling; Patent CN202110246835.5 proposes a differential thickness plate rolling method with dynamically changing reduction rate; Patent CN201410256378.8 proposes a medium and thick plate differential thickness preparation device that adjusts the thickness by adjusting the width. Patent CN201810160115.5 and Patent CN201810160114.0 propose a variable thickness rolling method for double-plate bonding for asymmetric two-stage and asymmetric three-stage differential thickness plates. The above inventions mainly consider the application of rolling methods, and rolling is achieved by adjusting the roll gap opening. The adjustment of the roll gap opening is inseparable from the roll reduction. The high-precision roll reduction requires high-precision monitoring and adjustment of the control system and detection system, and places extremely high demands on the coordination of subsystems at all levels.

[0006] While the aforementioned patents provide devices and methods for rolling differentially thick plates, issues such as device power, equipment rigidity, control accuracy, and overall system coordination remain prominent. To meet the production requirements of cold-rolling differentially thick plates, including high rolling force, high precision, and stable plate flow, a device and method for cold-rolling differentially thick plates with high power, high rigidity, easy adjustment, and coordination is urgently needed. Summary of the Invention

[0007] The purpose of the present invention is to provide a cold-rolled differential thickness plate coordinated support roller, which can be used in the cold rolling production of differential thickness plates and mechanically coordinate and correct the rolling trajectory of the differential thickness plates.

[0008] Another object of the present invention is to provide a cold rolling mill platform for plates with different thicknesses, which is mounted on a four-roll mill through coordinated support rollers to achieve cold rolling of plates with different thicknesses.

[0009] Another object of the present invention is to provide a method for determining the roll profile of the coordinated support roll for cold-rolled differential thickness plates, perform feedback adjustment based on online detection data, realize dynamic compensation of the coordinated rolling trajectory, and thereby ensure stable control and continuous production of variable thickness in differential thickness plate production.

[0010] To this end, the technical solutions provided by the present invention are as follows:

[0011] The utility model discloses a coordinated support roller for cold-rolling differential thickness plates. The coordinated support roller has a roller profile, and its shape is consistent with the target thickness difference variation trajectory of the differential thickness plates.

[0012] The roller profile is divided into n angular zones, and the n angular zones correspond to n differential plate thickness change control cycles.

[0013] The roller profile includes an arc-shaped transition zone roller profile and a straight-line transition zone roller profile.

[0014] A differential thickness plate cold rolling mill platform includes a mill body, the mill body includes working rolls and coordinated support rolls, the coordinated support rolls are two, namely an upper coordinated support roll and a lower coordinated support roll, the working rolls are two, namely an upper working roll and a lower working roll, the upper coordinated support roll, the upper working roll, the lower working roll and the lower coordinated support roll are arranged in sequence from top to bottom and their rotation centers are all in the same vertical plane, and the differential thickness plate strip is between the upper working roll and the lower working roll.

[0015] It also includes a control system and an inlet side thickness gauge and an outlet side thickness gauge, an inlet side guide roller and an outlet side guide roller, an inlet side curling roller and an outlet side curling roller, which are symmetrically arranged on both sides of the rolling mill body from near to far. The inlet side thickness gauge and the outlet side thickness gauge are both connected to the control system by electrical signals.

[0016] The cross sections of the upper working roll and the lower working roll are both circular, and the roll profiles of the upper coordinated support roll and the lower coordinated support roll are the same.

[0017] A method for determining the roll profile of a cold-rolled differentially thick plate supporting roll comprises the following steps:

[0018] Step 1) Obtain the thickness variation of the target thickness difference plate in the longitudinal direction and obtain the single-cycle thickness fluctuation function h(l);

[0019] Step 2) Extract the rolling speed function v(l) in a single cycle, obtain the single cycle work roll pressure lift time t=l / v(l), and then obtain the single cycle work roll stroke function g arc (t) = h(l) / t;

[0020] Step 3) According to the rolling speed function v(l), the working roll speed ω W The matching relationship between the work roll radius r and the hysteresis relationship k between the work roll and the rolled product is taken into account. z , calculate the value of the working roller radius r=v / (k z ω W );

[0021] Step 4) The roll profile of the coordinated support roll is taken as n periods, and the support roll radius is R = nr;

[0022] Step 5) Calculate the angle of the support roller according to the formula θ = ω B t, the working roll stroke function g arc (t) is converted into the radius variation function h of the coordinated support roller within a single cycle are (θ), and draw the single-cycle roll profile of the coordinated support roll;

[0023] Step 6) According to the radius variation function h within a single cycle are(θ), the roll profile of n periods is uniformly configured for the coordinated support rolls, and the processing line test is carried out.

[0024] The online testing process in step 6) is as follows:

[0025] (1) Setting the allowable error Δf of the support roller profile function BR ;

[0026] (2) The plate strip with different thickness is transferred from the entry side curling roller to the entry side of the rolling mill through the entry side guide roller. Before the plate strip with different thickness bites into the mill, the thickness difference distribution of the incoming material is detected by the entry side thickness gauge, and the entry side thickness difference fluctuation function f1(l) of the plate strip with different thickness is obtained in real time, where l is the strip length coordinate within one cycle, -T <l<T;

[0027] (3) After the plate with different thickness is bitten, the thickness gauge at the exit side obtains the thickness difference fluctuation function f2(l) of the plate with different thickness in real time;

[0028] (4) If the difference between the thickness fluctuation function of the inlet side and the outlet side Δf=f2(l)-f1(l) in the support roller profile function f BR Permissible error Δf of (θ) BR If it is inside, it indicates that the variable thickness control of the cold-rolled differential thickness plate is effective and the roll profile of the support roll meets the requirements;

[0029] If the thickness fluctuation function difference between the inlet side and the outlet side Δf=f2(l)-f1(l) exceeds the support roller profile function f BR Permissible error Δf of (θ) BR , then re-grind the support roller profile.

[0030] The beneficial effects of the present invention are:

[0031] The present invention can be used for the cold rolling production of differential thickness plates, mechanically coordinates and corrects the rolling trajectory of the differential thickness plates, and performs feedback adjustment based on online detection data to achieve dynamic compensation of the coordinated rolling trajectory, thereby ensuring stable control of variable thickness and continuous production in the production of differential thickness plates.

[0032] The cold rolling mill platform for differential thickness plates of the present invention adopts a bilaterally symmetrical structure, with a mill body provided in the very center of the platform for implementing variable thickness rolling of differential thickness plates; an inlet-side thickness gauge and an outlet-side thickness gauge are symmetrically arranged at equal intervals on both sides of the inlet and outlet of the mill body for real-time feedback of plate thickness signals; an inlet-side curling roller and an outlet-side curling roller are respectively equidistantly arranged at positions away from the inlet-side thickness gauge and the outlet-side thickness gauge at positions of the mill body for implementing curling of cold-rolled differential thickness plates; in order to dynamically adjust the inlet-side tension value and the outlet-side tension value during the rolling of differential thickness plates, an inlet-side guide roller and an outlet-side guide roller are respectively installed, and the outlet-side guide roller can move up and down at its position, and the tension level on both sides can be dynamically adjusted by means of position changes.

[0033] The present invention can realize the production of differential thickness plate rolling in arc-shaped transition zones and straight-line transition zones. Compared with existing technologies for rolling dies, the present invention not only gives the plate and strip mill the ability to roll differential thickness plates, but also retains the mill's rigidity, providing a foundation for the cold rolling production of differential thickness plates. Compared with two-roll mills with specially designed roll profiles on the working rolls, the present invention can directly avoid damage caused by direct contact between the contoured rolls and the rolled piece, and the working rolls have a small diameter, which is conducive to the production of thin-gauge differential thickness plates. Compared with existing control methods, the mechanical variable thickness rolling method adopted by the present invention can reduce the manufacturing cost and control difficulty of the control device and supporting systems, maximize the linkage of the entire machine system, and reduce the complexity of the entire differential thickness plate rolling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the outline of the coordinated support rollers for cold-rolling differentially thick plates in the arc-shaped transition zone of the present invention;

[0035] Figure 2 This is the outline and coordination diagram of the coordinated support rolls for the cold-rolled differential thickness plate in the arc-shaped transition zone of the present invention;

[0036] Figure 3 This is the profile of the coordinated support roll for cold-rolled differentially thick plates in the straight transition zone of the present invention;

[0037] Figure 4 This is a schematic diagram of the configuration of the support rolls for cold-rolled differentially thick plates in a straight-line transition zone according to the present invention;

[0038] Figure 5 This is a schematic structural diagram of an embodiment of a rolling mill body of the present invention;

[0039] Figure 6 This is a schematic structural diagram of an embodiment of a cold rolling mill platform for differentially thick plates of the present invention;

[0040] Figure 7 It is a comparison chart of the actual thickness and ideal thickness of the differential thickness plate within a single cycle.

[0041] In the figure: 1. Curling roller on the entrance side; 2. Guide roller on the entrance side; 3. Plate and strip with different thickness; 4. Thickness gauge on the entrance side; 5. Rolling mill body; 6. Thickness gauge on the exit side; 7. Guide roller on the exit side; 8. Curling roller on the exit side; 5-1. Upper coordinated support roller; 5-2. Upper working roller; 5-3. Lower working roller; 5-4. Lower coordinated support roller. DETAILED DESCRIPTION

[0042] The following describes the embodiments of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0043] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so as to provide a thorough and complete disclosure of the present invention and fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0044] Unless otherwise specified, the terms used herein (including technical terms) have the meanings commonly understood by those skilled in the art. In addition, it is understood that terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0045] Example 1

[0046] This embodiment provides a coordinated support roller for cold-rolling differential thickness plates. The coordinated support roller has a roller profile, and its shape is consistent with the target thickness difference variation trajectory of the differential thickness plates.

[0047] like Figure 1 and Figure 3 As shown, the coordinated support roll has a roll profile and can be used for cold rolling production of differential thickness plates to mechanically coordinate and correct the rolling trajectory of differential thickness plates.

[0048] Example 2

[0049] On the basis of Example 1, this embodiment provides a support roller for cold-rolling differential thickness plate, wherein the roller profile is divided into n angular zones, and the n angular zones correspond to n differential thickness plate variable thickness control cycles.

[0050] The roller profile is divided into n angle zones, and the angle value corresponding to each angle zone is 2π / n, which can realize n cycles of differential thickness plate variable thickness control.

[0051] Example 3

[0052] On the basis of Example 1, this embodiment provides a cold-rolled differential thickness plate coordinated support roller, wherein the roller profile includes an arc-shaped transition zone roller profile and a straight-line transition zone roller profile.

[0053] like Figure 2 As shown, the roller profile is an arc-shaped transition zone roller profile, and the corresponding differential thickness plate has an arc-shaped transition zone; Figure 4 As shown, the roller profile is a straight transition zone roller profile, and the corresponding differential thickness plate has a straight transition zone.

[0054] Example 4

[0055] This embodiment provides a cold rolling mill platform for differentially thick plates, such as Figure 5 As shown, it includes a rolling mill body 5, and the rolling mill body 5 includes working rolls and coordinated support rolls. There are two coordinated support rolls, namely, an upper coordinated support roll 5-1 and a lower coordinated support roll 5-4. There are two working rolls, namely, an upper working roll 5-2 and a lower working roll 5-3. The upper coordinated support roll 5-1, the upper working roll 5-2, the lower working roll 5-3 and the lower coordinated support roll 5-4 are arranged in sequence from top to bottom and the rotation centers are all in the same vertical plane. The plate strip 3 with different thickness is between the upper working roll 5-2 and the lower working roll 5-3.

[0056] The rolling mill body 5 is used to implement variable thickness rolling of differential thickness plates, and the roll system has no offset and no crossover.

[0057] Example 5

[0058] Based on Example 4, this embodiment provides a differential thickness plate cold rolling mill platform, which also includes a control system and an inlet side thickness gauge and an outlet side thickness gauge 6, an inlet side guide roller 2 and an outlet side guide roller 7, an inlet side curling roller 1 and an outlet side curling roller 8, which are symmetrically arranged on both sides of the rolling mill body 5 from near to far, and the inlet side thickness gauge and the outlet side thickness gauge 6 are both electrically connected to the control system signal.

[0059] like Figure 6 As shown, the coordinated support rollers can be mounted on a four-high rolling mill, adopting a bilaterally symmetrical structure. The center of the platform is the mill body 5, and along the rolling direction are the entry-side curling roller 1, the entry-side guide roller 2, the entry-side thickness gauge 4, the mill body 5, the exit-side thickness gauge 6, the exit-side guide roller 7, and the exit-side curling roller 8. This differential thickness plate cold rolling mill platform adopts unidirectional rolling, and the same rolling direction is used for coil changing and second-pass rolling to ensure that the thickness variation of the differential thickness plate matches the coordinated profile of the support rollers. After the single-pass rolling of the differential thickness plate is completed, the coil needs to be unloaded by the exit-side curling roller 8, and a new differential thickness plate strip 3 needs to be loaded at the entry-side curling roller 1, and then the strip is threaded and the next rolling pass is carried out.

[0060] Example 6

[0061] Based on Example 1, this example provides a differential thickness plate cold rolling mill platform, wherein the cross-sections of the upper working roll 5-2 and the lower working roll 5-3 are both circular, and the upper coordinated support roll 5-1 and the lower coordinated support roll 5-4 have the same roll profile.

[0062] like Figure 5 and Figure 6 As shown, the upper work roll 5-2 and the lower work roll 5-3 are both circular in cross-section and have no special roll profile. The upper and lower coordinated backup rolls 5-1 and 5-4 have the same roll profile to avoid asymmetric rolling caused by offset of the rolling centerline during rolling and to ensure that the upper and lower surfaces of the differential thickness plate strip 3 have the same thickness variation trajectory.

[0063] The present invention uses an upper working roll 5-2 and a lower working roll 5-3 without a special roll profile, which can directly avoid damage caused by the rolls with profiles directly contacting the rolled piece. In addition, the working rolls have a small diameter (1 / n of the matching support rolls), which is conducive to the production of thin-gauge and differentially thick plates.

[0064] Example 7

[0065] This embodiment provides a method for determining the roll profile of a cold-rolled differentially thick plate with a support roll, comprising the following steps:

[0066] Step 1) Obtain the thickness variation of the target thickness difference plate in the longitudinal direction and obtain the single-cycle thickness fluctuation function h(l);

[0067] Step 2) Extract the rolling speed function v(l) in a single cycle, obtain the single cycle work roll pressure lift time t=l / v(l), and then obtain the single cycle work roll stroke function g arc (t) = h(l) / t;

[0068] Step 3) According to the rolling speed function v(l), the working roll speed ω W The matching relationship between the work roll radius r and the hysteresis relationship k between the work roll and the rolled product is taken into account. z , calculate the value of the working roller radius r=v / (k z ω W );

[0069] Step 4) The roll profile of the coordinated support roll is taken as n periods, and the support roll radius is R = nr;

[0070] Step 5) Calculate the angle of the support roller according to the formula θ = ω B t, the working roll stroke function g arc (t) is converted into the radius variation function h of the coordinated support roller within a single cycle are (θ), and draw the single-cycle roll profile of the coordinated support roll;

[0071] Step 6) According to the radius variation function h within a single cycle are (θ), the roll profile of n periods is uniformly configured for the coordinated support rolls, and the processing line test is carried out.

[0072] To reduce the dead zone caused by the inaccessibility of the work rolls, the present invention requires that the work rolls be within a single backup roll angle zone, effectively completing a single thickness change control. Therefore, the ratio of the diameters of the coordinated backup rolls to the work rolls must be equal to the number of angle zones, n, in the backup roll profile.

[0073] The present invention performs feedback adjustment according to online detection data to achieve dynamic compensation of the coordinated rolling trajectory, thereby ensuring stable control of variable thickness and continuous production in the production of differential thickness plates.

[0074] Example 8

[0075] Based on Example 7, this embodiment provides a method for determining the roll profile of a cold-rolled differentially thick plate with a support roll. The online test process in step 6) is as follows:

[0076] (1) Setting the allowable error Δf of the support roller profile function BR ;

[0077] (2) The plate strip 3 with different thickness is transferred from the inlet side curling roller 1 to the inlet side of the rolling mill body 5 via the inlet side guide roller 2. Before the plate strip 3 with different thickness bites into the mill, the thickness difference distribution of the incoming material is detected by the inlet side thickness gauge 4. The inlet side thickness difference fluctuation function f1(l) of the plate strip 3 with different thickness is obtained in real time, where l is the strip length coordinate within one cycle, -T <l<T;

[0078] (3) After the differential thickness plate is bitten, the outlet side thickness gauge 6 obtains the outlet side thickness difference fluctuation function f2(l) of the differential thickness plate strip 3 in real time;

[0079] (4) If the difference between the thickness fluctuation function of the inlet side and the outlet side Δf=f2(l)-f1(l) in the support roller profile function f BR Permissible error Δf of (θ) BR If it is inside, it indicates that the variable thickness control of the cold-rolled differential thickness plate is effective and the roll profile of the support roll meets the requirements;

[0080] If the thickness fluctuation function difference between the inlet side and the outlet side Δf=f2(l)-f1(l) exceeds the support roller profile function f BR Permissible error Δf of (θ) BR , then re-grind the support roller profile.

[0081] In order to further illustrate the present invention, the method of the present invention is described in detail by taking the transition zone of the differential thickness plate as an arc-shaped transition zone as an example.

[0082] The product has an arc-shaped transition zone, and the support roller profile is divided into 6 angle zones, each of which corresponds to an angle of 60°; within the same cycle, the spacing between two arc-shaped transition zones is 100mm, and the spacing between adjacent cycles is 100mm; the arc-shaped transition zone adopts a quarter-elliptical arc transition, with a major axis of 20mm and a minor axis of 1mm.

[0083] The method for determining the roll profile of the support roll for cold-rolled differentially thick plate comprises the following steps:

[0084] Step 1: Obtain the thickness variation of the plate in the length direction. According to the periodic variation of the plate thickness of the target product, extract the single-cycle thickness fluctuation function h(l)

[0085]

[0086] Step 2: Extract the rolling speed function v(l) = 10 000 mm / min in a single cycle, and calculate the work roll lifting time t = 300 / 10 000 = 0.03 min in a single cycle; then obtain the work roll stroke function g in a single cycle arc (t)

[0087]

[0088] Step 3: According to the rolling speed v = 10 000 mm / min and the working roll speed ω W =2.7rad / s and the matching relationship between the work roll radius r, and taking into account the hysteresis relationship k between the work roll and the rolled product z =1, calculate the value of the working roll radius r = v / (k z ω W )=60mm;

[0089] Step 4: Take the roll profile of the coordinated support roll as 6 periods, then the radius of the coordinated support roll is R = nr = 360 mm;

[0090] Step 5: Then, calculate the angle of the support roller according to the formula θ = ω B t, the working roll can be lifted by the function g arc (t) is converted into the radius variation function h of the coordinated support roller within a single cycle are (θ), and draw the single-cycle roll profile of the coordinated support roll;

[0091]

[0092] Step 6: According to the radius variation function h within a single cycle are (θ) is the roll profile of the uniformly configured 6 cycles of the supporting rolls, and the processing line test is carried out.

[0093] The roll profile is divided into n angular zones, and the corresponding angular value of each angular zone is 2π / n, and the differential thickness control of the differential thickness plate for n cycles can be correspondingly realized. The backup roll profile function is f BR (θ), which can reflect the roll diameter change at different angular positions. To determine whether the thickness fluctuation of the differential thickness plate meets the preset requirements, it is necessary to set the allowable error Δf of the backup roll profile function before rolling BR , which is set to 0.15 mm in this embodiment. During the cold rolling of the differential thickness plate, the differential thickness plate strip 3 is transmitted from the inlet side coiling roll 1 through the inlet side guide roll 2 to the inlet side of the rolling mill. Before entering the rolling process, the incoming thickness difference distribution is detected by the inlet side thickness gauge 4, and the inlet side thickness difference fluctuation function f1(l) of the differential thickness plate strip 3 is obtained in real time, where l is a single-cycle variable, -T < l < T. Then the rolling starts, and the outlet side thickness difference fluctuation function f2(l) of the differential thickness plate strip 3 is obtained in real time by the outlet side thickness gauge 6. After detection, as Figure 7 shown, the thickness difference fluctuation value is less than 0.15 mm, which is lower than the allowable error value, indicating that the coordinated backup roll profile control of the cold rolled differential thickness plate is effective and the rolling can continue

[0094] The above examples are only illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. Any design identical or similar to the present invention falls within the protection scope of the present invention

Claims

1. A method for determining the roll profile of a cold-rolled differential thickness plate with a support roll, wherein the support roll has a roll profile whose shape matches the target thickness variation trajectory of the differential thickness plate. The roll profile is divided into n Angle area, n Angular area corresponds to n A thickness control cycle for differential plate thickness variation, characterized in that: The following steps are involved: Step 1) Obtain the thickness variation of the target thickness plate in the longitudinal direction and obtain the single-cycle thickness fluctuation function h ( l ),in l is the belt length coordinate within a period; Step 2) Extract the rolling speed function within a single cycle v ( l ), get the single cycle working roller pressing and lifting time t = l / v ( l ), and then obtain the working roll stroke function within a single cycle g arc ( t )= h ( l ) / t ; Step 3) According to the rolling speed function v ( l ), working roll speed ω W With the working roll radius r The matching relationship between the work roll and the rolled product is taken into consideration. k z , calculate the value of the working roller radius r=v / (k z ω W ); Step 4) Take the roll profile of the coordinated support roll as n cycles, the support roller radius is R = nr ; Step 5) Calculate the angle of the support roller according to the formula θ = ω B t , the working roll stroke function g arc ( t ) is converted into the radius variation function of the coordinated support roller within a single cycle h are ( θ ), and draw the single-cycle roll profile of the coordinated support roll; Step 6) According to the radius variation function within a single cycle h are ( θ ), for uniform configuration of the supporting rollers n The roll profile of each cycle is determined and tested on the production line.

2. The method for determining the roll profile of a cold-rolled differentially thick plate supporting roll according to claim 1, characterized in that: The roller profile includes an arc-shaped transition zone roller profile and a straight-line transition zone roller profile.

3. The method for determining the roll profile of a cold-rolled differentially thick plate coordinated support roll according to claim 1, characterized in that: There are two coordinated support rolls, namely an upper coordinated support roll and a lower coordinated support roll, and there are two working rolls, namely an upper working roll and a lower working roll. The upper coordinated support roll, the upper working roll, the lower working roll and the lower coordinated support roll are arranged in sequence from top to bottom and their rotation centers are all in the same vertical plane. There is a plate and strip of different thickness between the upper working roll and the lower working roll.

4. The method for determining the roll profile of a cold-rolled differentially thick plate supporting roll according to claim 1, characterized in that: It also includes a control system and an inlet side thickness gauge and an outlet side thickness gauge, an inlet side guide roller and an outlet side guide roller, an inlet side curling roller and an outlet side curling roller, which are symmetrically arranged on both sides of the rolling mill body from near to far. The inlet side thickness gauge and the outlet side thickness gauge are both connected to the control system by electrical signals.

5. The method for determining the roll profile of the cold-rolled differentially thick plate coordinated support roll according to claim 3, characterized in that: The cross sections of the upper working roll and the lower working roll are both circular, and the roll profiles of the upper coordinated support roll and the lower coordinated support roll are the same.

6. The method for determining the roll profile of a cold-rolled differentially thick plate supporting roll according to claim 4, characterized in that: The online testing process in step 6) is as follows: (1) Setting the allowable error of the support roller profile function Δf BR ; (2) The plate strip with different thickness is transferred from the entrance side curling roller to the entrance side of the rolling mill through the entrance side guide roller. Before the plate strip with different thickness is bitten, the thickness difference distribution of the incoming material is detected by the thickness gauge on the entrance side, and the thickness difference fluctuation function of the plate strip with different thickness is obtained in real time. f 1( l ); (3) After the thickness difference plate is bitten, the thickness gauge on the outlet side obtains the thickness difference fluctuation function of the thickness difference plate strip in real time. f 2( l ); (4) If the difference in thickness fluctuation function between the inlet and outlet sides is Δf = f 2( l )- f 1( l ) in the support roller profile function f BR ( θ ) allowable error Δf BR If it is inside, it indicates that the variable thickness control of the cold-rolled differential thickness plate is effective and the roll profile of the support roll meets the requirements; If the thickness fluctuation function difference between the inlet and outlet sides Δf = f 2( l )- f 1( l ) has exceeded the support roller profile function f BR ( θ ) allowable error Δf BR , then re-grind the support roller profile.

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