A rough rolling pass correction control method and system

Abstract

The present application proposes a rough rolling pass correction control method and system, comprising: recalculating the flat roll gap and flat roll rolling force of the current pass according to the actually measured flat roll rolling force and the actually measured flat roll gap of the previous pass, so as to obtain the corrected flat roll gap and flat roll rolling force of the current pass; recalculating the vertical roll gap of the current pass according to the actually measured vertical roll rolling force and the actually measured vertical roll gap of the previous pass, so as to obtain the corrected vertical roll gap of the current pass; recalculating the inlet side guide plate opening and the outlet side guide plate opening of the current pass according to the actually measured vertical roll gap of the previous pass and the rough rolling exit width gauge data, so as to obtain the corrected inlet side guide plate opening and the outlet side guide plate opening of the current pass; sending the corrected flat roll gap, flat roll rolling force, vertical roll gap, inlet side guide plate opening and outlet side guide plate opening of the current pass to the rough rolling mill control end to complete the rough rolling pass correction control.

Description

Technical Field

[0001] The present application relates to the field of intelligent steel production applications, and in particular to a rough rolling pass correction control method and system. Background Art

[0002] At present, the rough rolling presetting of hot rolling production line generally adopts the discharge temperature calculated by the secondary combustion control model of the heating furnace for rough rolling presetting calculation. In daily production, due to the deviation between the actual discharge temperature of the slab and the discharge temperature calculated by the model, the measured rolling force, roll gap and other parameters in each rough rolling process have large deviations from the preset values, resulting in large deviations between the thickness and width of the intermediate billet and the target value. If the deviation of the thickness or width of the intermediate billet is too large, the steel will be directly piled up at the hot coil box or the finishing rolling entrance, affecting the stable and smooth production.

[0003] Application Contents

[0004] In view of the above problems existing in the prior art, the present application proposes a rough rolling pass correction control method and system, which mainly solves the problem that the existing control technology has no frequent rough rolling pass correction calculations, resulting in excessive deviations in intermediate billet thickness and width and waste steel.

[0005] In order to achieve the above-mentioned purpose and other purposes, the technical solution adopted in this application is as follows.

[0006] The present application provides a rough rolling pass correction control method, comprising:

[0007] Obtain the actual flat roll rolling force, actual flat roll gap, actual vertical roll rolling force, actual vertical roll gap and rough rolling exit width gauge data of the previous pass;

[0008] Recalculating the flat roll gap and the flat roll rolling force of the current pass according to the actually measured flat roll rolling force and the actually measured flat roll gap of the previous pass, so as to obtain the corrected flat roll gap and the flat roll rolling force of the current pass;

[0009] Recalculate the vertical roll gap of the current pass according to the actually measured vertical roll rolling force and the actually measured vertical roll gap of the previous pass to obtain a corrected vertical roll gap of the current pass;

[0010] Recalculate the guide plate opening degree at the entrance side and the guide plate opening degree at the exit side of the current pass according to the measured vertical roll gap of the previous pass and the rough rolling exit width gauge data, and obtain the corrected guide plate opening degree at the entrance side and the guide plate opening degree at the exit side of the current pass;

[0011] The flat roll gap, flat roll rolling force, vertical roll gap, inlet guide plate opening and outlet guide plate opening corrected for the current pass are sent to the rough rolling mill control end to complete the rough rolling pass correction control.

[0012] In one embodiment of the present application, recalculating the flat roll gap and the flat roll rolling force of the current pass according to the actually measured flat roll rolling force and the actually measured flat roll gap of the previous pass includes:

[0013] Calculating the bounce roll gap of the previous pass according to the measured flat roll rolling force;

[0014] Calculate the slab outlet thickness of the previous pass according to the measured flat roll gap and the bounce roll gap of the previous pass;

[0015] Calculate the slab outlet thickness of the current pass according to the slab outlet thickness of the previous pass and the relative reduction rate of the flat rollers of the current pass;

[0016] The flat roll gap of the current pass is recalculated according to the slab outlet thickness of the current pass.

[0017] In one embodiment of the present application, the method of calculating the bounce roll gap of the previous pass according to the measured flat roll rolling force includes:

[0018] S(i)=(F(i)-F0) / M

[0019] Wherein, F(i) is the measured rolling force of the ith pass; F0: rough rolling zero adjustment pressure; M: rough rolling mill stiffness;

[0020] The method of calculating the slab outlet thickness of the previous pass according to the measured flat roll gap and the bouncing roll gap of the previous pass includes: the slab outlet thickness of the previous pass = the measured flat roll gap of the previous pass + (the bouncing roll gap of the previous pass + the roll system deformation - the oil film thickness) - the zero adjustment position;

[0021] According to the slab outlet thickness of the previous pass and the relative reduction rate of the flat rollers of the current pass, the method of calculating the slab outlet thickness of the current pass includes: the slab outlet thickness of the current pass = the slab outlet thickness of the previous pass - the relative reduction rate of the flat rollers of the current pass × the slab outlet thickness of the previous pass;

[0022] The method of recalculating the flat roller gap of the current pass according to the slab outlet thickness of the current pass includes: the flat roller gap of the current pass = the slab outlet thickness of the current pass - (the current bounce roller gap + roller system deformation - oil film thickness) + zero adjustment position.

[0023] In one embodiment of the present application, recalculating the flat roll gap and the flat roll rolling force of the current pass according to the actually measured flat roll rolling force and the actually measured flat roll gap of the previous pass includes:

[0024] F(i)=B(i)×Lc(i)×Qp(i)×Km(i)×(1+Qpf(i))

[0025] Where, F(i) is the flat roll rolling force of the i-th pass, B(i) is the entrance width of the i-th pass, Lc(i) is the roller contact arc length, Qp(i) is the stress state coefficient, Km(i) is the deformation resistance, and Qpf(i) is the rolling force self-learning coefficient; In the formula: Ri: radius of the working roll of the roughing mill, Hi: entrance thickness of the i-th pass, hi: exit thickness of the i-th pass.

[0026] In one embodiment of the present application, the vertical roll gap of the current pass is recalculated according to the measured vertical roll rolling force and the measured vertical roll gap of the previous pass to obtain the corrected vertical roll gap of the current pass, including:

[0027] If the current pass is an odd pass, the calculation method for the correction of the vertical roll gap of the current pass includes: the vertical roll gap of the odd pass = the exit width - the measured vertical roll rolling force of the previous pass / the vertical roll mill stiffness; wherein the exit width = the entrance width - the vertical roll side pressure of the current pass;

[0028] If the current pass is an even pass, the calculation method for correcting the roll gap of the vertical rollers of the current pass includes: roll gap of the vertical rollers of even passes = entrance width + increase in roll gap of the vertical rollers; wherein the entrance width is the actually measured width at the exit of the previous pass.

[0029] In one embodiment of the present application, the side pressure of the vertical roll in the current pass = (slab width - intermediate billet target width + flat roll width expansion) × vertical roll load distribution coefficient.

[0030] In one embodiment of the present application, the inlet guide plate opening and the outlet guide plate opening of the current pass are recalculated according to the measured vertical roll gap of the previous pass and the rough rolling exit width gauge data to obtain the corrected inlet guide plate opening and the outlet guide plate opening of the current pass, including:

[0031] If the current pass is an odd pass, the calculation method of the guide plate opening degree on the inlet side and the guide plate opening degree on the outlet side of the current pass includes:

[0032] The opening degree of the guide plate on the entrance side of the odd channel = the entrance width of the vertical roller + the opening margin on the entrance side + the correction amount of the guide plate on the entrance side;

[0033] The opening degree of the guide plate at the exit of the odd channel = the setting value of the exit width gauge + the opening margin at the exit + the correction value of the guide plate at the exit;

[0034] If the current pass is an even pass, the calculation method of the guide plate opening degree on the inlet side and the guide plate opening degree on the outlet side of the current pass includes:

[0035] Even-pass entrance side guide plate opening = even-pass entrance width + entrance side opening margin + exit side guide plate correction;

[0036] The guide plate opening on the even-pass exit side = the even-pass vertical roller exit width + the exit side opening margin + the inlet side guide plate correction amount.

[0037] The present application also provides a rough rolling pass correction control system, comprising:

[0038] The data acquisition module is used to obtain the actual flat roll rolling force, the actual flat roll gap, the actual vertical roll rolling force, the actual vertical roll gap and the rough rolling exit width gauge data of the previous pass;

[0039] A flat roll correction calculation module, used for recalculating the flat roll gap and the flat roll rolling force of the current pass according to the actually measured flat roll rolling force and the actually measured flat roll gap of the previous pass, so as to obtain the corrected flat roll gap and the flat roll rolling force of the current pass;

[0040] A vertical roll gap correction calculation module is used to recalculate the vertical roll gap of the current pass according to the measured vertical roll rolling force and the measured vertical roll gap of the previous pass, so as to obtain a corrected vertical roll gap of the current pass;

[0041] An opening degree correction calculation module is used to recalculate the opening degree of the guide plate on the entrance side and the guide plate on the exit side of the current pass according to the measured roll gap of the vertical rolls of the previous pass and the rough rolling exit width gauge data, so as to obtain the corrected opening degree of the guide plate on the entrance side and the guide plate on the exit side of the current pass;

[0042] The correction module is used to send the corrected flat roll gap, flat roll rolling force, vertical roll gap, inlet side guide plate opening and outlet side guide plate opening of the current pass to the rough rolling mill control end to complete the rough rolling pass correction control.

[0043] As described above, the present application provides a rough rolling pass correction control method and system, which have the following beneficial effects.

[0044] The present application obtains the actual flat roll rolling force, the actual flat roll gap, the actual vertical roll rolling force, the actual vertical roll gap and the rough rolling exit width gauge data of the previous pass; recalculates the flat roll gap and the flat roll rolling force of the current pass according to the actual flat roll rolling force and the actual flat roll gap of the previous pass, and obtains the corrected flat roll gap and the flat roll rolling force of the current pass; recalculates the vertical roll gap of the current pass according to the actual vertical roll rolling force and the actual vertical roll gap of the previous pass, and obtains to the corrected vertical roll gap of the current pass; recalculate the entrance guide plate opening and exit guide plate opening of the current pass according to the measured vertical roll gap of the previous pass and the rough rolling exit width gauge data, and obtain the corrected entrance guide plate opening and exit guide plate opening of the current pass; send the corrected flat roll gap, flat roll rolling force, vertical roll gap, entrance guide plate opening and exit guide plate opening of the current pass to the rough rolling mill control end to complete the rough rolling pass correction control. The present application can correct and calculate the preset data of the current pass according to the measured rolling force and roll gap data of the previous pass, and then automatically correct the preset data of each pass to ensure that the thickness and width of the intermediate billet of each pass meet the production requirements of the subsequent process, reduce the recurrence of scrap steel accidents caused by excessive deviations in the thickness and width of the intermediate billet, and ensure smooth and stable production. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a flow chart of a rough rolling pass correction control method in one embodiment of the present application.

[0046] Figure 2 It is a module diagram of a rough rolling pass correction control system in one embodiment of the present application. DETAILED DESCRIPTION

[0047] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0048] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0049] In one embodiment, the existing hot coil production line of a steel rolling mill is equipped with a 4-roll reversible rough rolling mill. At present, the rough rolling pre-setting uses the discharge temperature calculated by the secondary combustion control model of the heating furnace for the rough rolling pre-setting calculation. The existing secondary model of rough rolling has no inter-pass setting correction calculation, resulting in the inability to correct the next pass pre-setting data according to the measured rolling force, roll gap, width, temperature, etc. after each rough rolling pass is completed. During the production process, due to the deviation between the actual temperature of the slab and the discharge temperature calculated by the model, the measured rolling force, roll gap and other parameters during each rough rolling pass deviate greatly from the preset values, resulting in a large deviation between the thickness and width of the intermediate billet and the target value. If the deviation of the thickness or width of the intermediate billet is too large, steel will be directly piled up at the hot coil box or the entrance of the finishing rolling, affecting the stable and smooth production.

[0050] The main problems of existing control technology are as follows:

[0051] 1. The rough rolling preset accuracy of existing control technology is low.

[0052] 2. The existing control technology only has one rough rolling preset calculation, and no correction setting calculation between rough rolling passes, and cannot correct the control deviation caused by the rough rolling preset.

[0053] 3. The thickness and width of the intermediate billet in the existing control technology deviate greatly from the target value, and the intermediate billet is often too thick or too wide at the entrance of the hot coil box or the entrance of the finishing rolling mill.

[0054] Based on the above problems existing in the prior art, the present application provides the following technical solutions to solve the above problems. The technical solutions of the present application will be elaborated in detail below in conjunction with specific implementation methods.

[0055] See also Figure 1 In one embodiment, the present application provides a rough rolling pass correction control method, which includes the following steps.

[0056] Step S01, obtaining the actual measured flat roll rolling force, the actual measured flat roll gap, the actual measured vertical roll rolling force, the actual measured vertical roll gap and the rough rolling exit width gauge data of the previous pass.

[0057] In one embodiment, the measured data of the corresponding pass can be obtained through the sensor equipment at the corresponding position of each pass of the rough rolling mill, wherein the sensor equipment may include a laser rangefinder, a pressure sensor, etc. The selection and setting position of the specific sensor equipment can be adjusted according to the actual application requirements and are not limited here.

[0058] In one embodiment, after each rough rolling pass is completed (exemplarily, it can be set to 5 passes), post-pass calculation is performed based on the measured rolling force, roll gap, width, temperature, etc., and the pass correction setting calculation is started.

[0059] Step S02, recalculating the flat roll gap and the flat roll rolling force of the current pass according to the actually measured flat roll rolling force and the actually measured flat roll gap of the previous pass, to obtain the corrected flat roll gap and the flat roll rolling force of the current pass.

[0060] In one embodiment, recalculating the flat roll gap and the flat roll rolling force of the current pass according to the actually measured flat roll rolling force and the actually measured flat roll gap of the previous pass includes:

[0061] Calculating the bounce roll gap of the previous pass according to the measured flat roll rolling force;

[0062] Calculating the slab outlet thickness of the previous pass according to the measured flat roll gap and the bounce roll gap of the previous pass;

[0063] Calculate the slab outlet thickness of the current pass according to the slab outlet thickness of the previous pass and the relative reduction rate of the flat rollers of the current pass;

[0064] The flat roll gap of the current pass is recalculated according to the slab outlet thickness of the current pass.

[0065] In one embodiment, the method of calculating the bounce roll gap of the previous pass according to the measured flat roll rolling force includes:

[0066] S(i)=(F(i)-F0) / M

[0067] Wherein, F(i) is the measured rolling force of the ith pass; F0: rough rolling zero adjustment pressure; M: rough rolling mill stiffness;

[0068] The method of calculating the slab outlet thickness of the previous pass according to the measured flat roll gap and the bouncing roll gap of the previous pass includes: the slab outlet thickness of the previous pass = the measured flat roll gap of the previous pass + (the bouncing roll gap of the previous pass + the roll system deformation - the oil film thickness) - the zero adjustment position;

[0069] According to the slab outlet thickness of the previous pass and the relative reduction rate of the flat rollers of the current pass, the method of calculating the slab outlet thickness of the current pass includes: the current pass outlet thickness = the previous pass outlet thickness - the current pass flat roller relative reduction rate × the previous pass outlet thickness;

[0070] The method of recalculating the flat roller gap of the current pass according to the slab outlet thickness of the current pass includes: the flat roller gap of the current pass = the slab outlet thickness of the current pass - (the current bounce roller gap + roller system deformation - oil film thickness) + zero adjustment position.

[0071] In one embodiment, recalculating the flat roll gap and the flat roll rolling force of the current pass according to the actually measured flat roll rolling force and the actually measured flat roll gap of the previous pass includes:

[0072] F(i)=B(i)×Lc(i)×Qp(i)×Km(i)×(1+Qpf(i))

[0073] Where, F(i) is the flat roll rolling force of the i-th pass, B(i) is the entrance width of the i-th pass, Lc(i) is the roller contact arc length, Qp(i) is the stress state coefficient, Km(i) is the deformation resistance, and Qpf(i) is the rolling force self-learning coefficient; In the formula: Ri: radius of the working roll of the roughing mill, Hi: entrance thickness of the i-th pass, hi: exit thickness of the i-th pass.

[0074] Step S03, recalculating the vertical roll gap of the current pass according to the actually measured vertical roll rolling force and the actually measured vertical roll gap of the previous pass, to obtain a corrected vertical roll gap of the current pass.

[0075] In one embodiment, taking 5 passes as an example, the rolling force and roll gap of the vertical rollers in the previous pass are measured (odd passes: 1, 3, 5 passes, even passes (vertical rollers pass empty): 2, 4 passes), and the roll gap of each pass is recalculated.

[0076] In one embodiment, the vertical roll gap of the current pass is recalculated according to the actually measured vertical roll rolling force and the actually measured vertical roll gap of the previous pass to obtain the corrected vertical roll gap of the current pass, including:

[0077] If the current pass is an odd pass, the calculation method for the correction of the vertical roll gap of the current pass includes: the vertical roll gap of the odd pass = the exit width - the measured vertical roll rolling force of the previous pass / the vertical roll mill stiffness; wherein the exit width = the entrance width - the vertical roll side pressure of the current pass;

[0078] If the current pass is an even pass, the vertical roller gap correction calculation method of the current pass includes: vertical roller gap of even passes = inlet width + vertical roller gap increase; wherein the inlet width is the measured width at the outlet of the previous pass. The vertical roller gap increase can be set to 150mm (empty vertical rollers in even passes).

[0079] In one embodiment, the vertical roll side pressure of the current pass = total width expansion (slab width - intermediate billet target width + flat roll width expansion) × vertical roll load distribution coefficient. The vertical roll load distribution coefficient can be set in the secondary process parameter table.

[0080] Step S04, recalculating the inlet guide plate opening and outlet guide plate opening of the current pass according to the measured vertical roll gap of the previous pass and the rough rolling exit width gauge data, to obtain the corrected inlet guide plate opening and outlet guide plate opening of the current pass.

[0081] In one embodiment, the guide plate opening degree at the entrance side and the guide plate opening degree at the exit side of each pass can be recalculated based on the data of the vertical roll gap and the exit width gauge actually measured in the previous pass.

[0082] In one embodiment, the inlet guide plate opening and the outlet guide plate opening of the current pass are recalculated according to the measured vertical roll gap of the previous pass and the rough rolling exit width gauge data to obtain the corrected inlet guide plate opening and the outlet guide plate opening of the current pass, including:

[0083] If the current pass is an odd pass, the calculation method of the guide plate opening degree on the inlet side and the guide plate opening degree on the outlet side of the current pass includes:

[0084] The opening degree of the guide plate on the entrance side of the odd channel = the entrance width of the vertical roller + the opening margin on the entrance side + the correction amount of the guide plate on the entrance side; among them, the opening margin on the entrance side (steel biting direction) can be set to 40mm, and the correction amount of the guide plate on the entrance side can be set according to needs in the operator screen.

[0085] The opening degree of the odd-pass exit guide plate = the setting value of the exit width gauge + the exit opening margin + the exit guide plate correction; among them, the exit opening margin (steel throwing direction) can be set to 80mm, and the exit guide plate correction can be set according to needs on the operator screen.

[0086] If the current pass is an even pass, the calculation method of the guide plate opening degree on the inlet side and the guide plate opening degree on the outlet side of the current pass includes:

[0087] The guide plate opening on the even-pass entrance side = the even-pass entrance width + the entrance side opening margin + the exit side guide plate correction; among them, the entrance side opening margin (steel biting direction) can be set to 40mm, and the exit side guide plate correction can be set according to needs on the operator screen.

[0088] The opening of the guide plate on the even-pass exit side = the exit width of the even-pass vertical roller + the outlet opening margin + the inlet guide plate correction. Among them, the outlet opening margin (steel throwing direction) can be set to 80mm, and the inlet guide plate correction can be set according to needs on the operator screen.

[0089] Step S05, sending the corrected flat roll gap, flat roll rolling force, vertical roll gap, inlet guide plate opening and outlet guide plate opening of the current pass to the rough rolling mill control end to complete the rough rolling pass correction control.

[0090] In one embodiment, post-pass calculation is performed based on the measured rolling force, roll gap, width, temperature, etc., the pass correction setting calculation is started, and the new setting value is sent to the roughing equipment for execution. Through the correction calculation of the roughing vertical rolls, flat roll gap, etc., the width and thickness of the intermediate billet in each pass are adjusted, thereby achieving the purpose of correcting the control deviation generated by the model preset in the previous pass in the next pass.

[0091] This embodiment also provides a rough rolling pass correction control system for executing the rough rolling pass correction control method described in the above method embodiment. Since the technical principle of the system embodiment is similar to that of the above method embodiment, the same technical details will not be repeated.

[0092] See also Figure 2 In one embodiment, a roughing pass correction control system comprises:

[0093] The data acquisition module 10 is used to obtain the actual flat roll rolling force, the actual flat roll gap, the actual vertical roll rolling force, the actual vertical roll gap and the rough rolling exit width gauge data of the previous pass;

[0094] A flat roll correction calculation module 11 is used to recalculate the flat roll gap and the flat roll rolling force of the current pass according to the actually measured flat roll rolling force and the actually measured flat roll gap of the previous pass, so as to obtain the corrected flat roll gap and the flat roll rolling force of the current pass;

[0095] A vertical roll gap correction calculation module 12 is used to recalculate the vertical roll gap of the current pass according to the actually measured vertical roll rolling force and the actually measured vertical roll gap of the previous pass, so as to obtain a corrected vertical roll gap of the current pass;

[0096] The opening degree correction calculation module 13 is used to recalculate the opening degree of the guide plate on the entrance side and the guide plate on the exit side of the current pass according to the measured roll gap of the vertical rolls of the previous pass and the rough rolling exit width gauge data, so as to obtain the corrected opening degree of the guide plate on the entrance side and the guide plate on the exit side of the current pass;

[0097] The correction module 14 is used to send the corrected flat roll gap, flat roll rolling force, vertical roll gap, inlet side guide plate opening and outlet side guide plate opening of the current pass to the rough rolling mill control end to complete the rough rolling pass correction control.

[0098] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A rough rolling pass correction control method, characterized in that: include: Obtain the actual flat roll rolling force, actual flat roll gap, actual vertical roll rolling force, actual vertical roll gap and rough rolling exit width gauge data of the previous pass; Recalculate the flat roll gap and flat roll rolling force of the current pass according to the measured flat roll rolling force and the measured flat roll gap of the previous pass to obtain the corrected flat roll gap and flat roll rolling force of the current pass; recalculate the flat roll gap and flat roll rolling force of the current pass according to the measured flat roll rolling force and the measured flat roll gap of the previous pass, including: calculate the bounce roll gap of the previous pass according to the measured flat roll rolling force; calculate the slab outlet thickness of the previous pass according to the measured flat roll gap and the bounce roll gap of the previous pass; calculate the slab outlet thickness of the current pass according to the slab outlet thickness of the previous pass and the relative reduction rate of the flat rolls of the current pass; recalculate the flat roll gap of the current pass according to the slab outlet thickness of the current pass; the method of calculating the bounce roll gap of the previous pass according to the measured flat roll rolling force includes: S(i)=(F(i)-F0) / M Wherein, F(i) is the measured rolling force of the ith pass; F0: rough rolling zero adjustment pressure; M: rough rolling mill stiffness; The method of calculating the slab outlet thickness of the previous pass according to the measured flat roll gap and the bouncing roll gap of the previous pass includes: the slab outlet thickness of the previous pass = the measured flat roll gap of the previous pass + (the bouncing roll gap of the previous pass + the roll system deformation - the oil film thickness) - the zero adjustment position; According to the slab outlet thickness of the previous pass and the relative reduction rate of the flat rollers of the current pass, the method of calculating the slab outlet thickness of the current pass includes: the current pass outlet thickness = the previous pass outlet thickness - the current pass flat roller relative reduction rate × the previous pass outlet thickness; The method of recalculating the flat roll gap of the current pass according to the slab outlet thickness of the current pass includes: the flat roll gap of the current pass = the slab outlet thickness of the current pass - (the bounce roll gap of the current pass + the deformation of the roller system - the oil film thickness) + the zero adjustment position; Recalculate the vertical roll gap of the current pass according to the actually measured vertical roll rolling force and the actually measured vertical roll gap of the previous pass to obtain a corrected vertical roll gap of the current pass; Recalculate the guide plate opening degree at the entrance side and the guide plate opening degree at the exit side of the current pass according to the measured vertical roll gap of the previous pass and the rough rolling exit width gauge data, and obtain the corrected guide plate opening degree at the entrance side and the guide plate opening degree at the exit side of the current pass; The flat roll gap, flat roll rolling force, vertical roll gap, inlet guide plate opening and outlet guide plate opening corrected for the current pass are sent to the rough rolling mill control end to complete the rough rolling pass correction control.

2. The rough rolling pass correction control method according to claim 1, characterized in that: Recalculating the flat roll gap and the flat roll rolling force of the current pass according to the actually measured flat roll rolling force and the actually measured flat roll gap of the previous pass, including: F(i)=B(i)×Lc(i)×Qp(i)×Km(i)×(1+Qpf(i)) Where, F(i) is the flat roll rolling force of the i-th pass, B(i) is the entrance width of the i-th pass, Lc(i) is the roller contact arc length, Qp(i) is the stress state coefficient, Km(i) is the deformation resistance, and Qpf(i) is the rolling force self-learning coefficient; In the formula: Ri: radius of the working roll of the roughing mill, Hi: entrance thickness of the i-th pass, hi: exit thickness of the i-th pass.

3. The rough rolling pass correction control method according to claim 1, characterized in that: Recalculating the vertical roll gap of the current pass according to the actually measured vertical roll rolling force and the actually measured vertical roll gap of the previous pass to obtain a corrected vertical roll gap of the current pass, including: If the current pass is an odd pass, the correction calculation method of the vertical roll gap of the current pass includes: the vertical roll gap of the odd pass = the exit width - the measured vertical roll rolling force of the previous pass / the vertical roll mill stiffness; wherein, the exit width = the entrance width - the vertical roll side pressure of the current pass; If the current pass is an even pass, the method for calculating the correction of the roll gap of the vertical rollers of the current pass includes: the roll gap of the vertical rollers of the even pass = the entrance width + the increase in the roll gap of the vertical rollers; wherein the entrance width is the actually measured width at the exit of the previous pass.

4. The rough rolling pass correction control method according to claim 3, characterized in that: The vertical roll side pressure of the current pass = (slab width - intermediate billet target width + flat roll width expansion) × vertical roll load distribution coefficient.

5. The rough rolling pass correction control method according to claim 1, characterized in that: According to the measured vertical roll gap of the previous pass and the rough rolling exit width gauge data, the inlet guide plate opening and the outlet guide plate opening of the current pass are recalculated to obtain the corrected inlet guide plate opening and the outlet guide plate opening of the current pass, including: If the current pass is an odd pass, the calculation method of the guide plate opening degree on the inlet side and the guide plate opening degree on the outlet side of the current pass includes: The opening degree of the guide plate on the entrance side of the odd channel = the entrance width of the vertical roller + the opening margin on the entrance side + the correction amount of the guide plate on the entrance side; The opening degree of the guide plate at the exit of the odd channel = the setting value of the exit width gauge + the opening margin at the exit + the correction value of the guide plate at the exit; If the current pass is an even pass, the calculation method of the guide plate opening degree on the inlet side and the guide plate opening degree on the outlet side of the current pass includes: Even-pass entrance side guide plate opening = even-pass entrance width + entrance side opening margin + exit side guide plate correction; The guide plate opening on the even-pass exit side = the even-pass vertical roller exit width + the exit side opening margin + the inlet side guide plate correction amount.

6. A rough rolling pass correction control system, characterized in that: include: The data acquisition module is used to obtain the actual flat roll rolling force, the actual flat roll gap, the actual vertical roll rolling force, the actual vertical roll gap and the rough rolling exit width gauge data of the previous pass; A flat roll correction calculation module is used to recalculate the flat roll gap and flat roll rolling force of the current pass according to the actually measured flat roll rolling force and the actually measured flat roll gap of the previous pass, and obtain the corrected flat roll gap and flat roll rolling force of the current pass; recalculate the flat roll gap and flat roll rolling force of the current pass according to the actually measured flat roll rolling force and the actually measured flat roll gap of the previous pass, including: calculating the bounce gap of the previous pass according to the actually measured flat roll rolling force; calculating the slab outlet thickness of the previous pass according to the actually measured flat roll gap and the bounce gap of the previous pass; calculating the slab outlet thickness of the current pass according to the slab outlet thickness of the previous pass and the relative reduction rate of the flat rolls of the current pass; recalculating the flat roll gap of the current pass according to the slab outlet thickness of the current pass; the method of calculating the bounce gap of the previous pass according to the actually measured flat roll rolling force includes: S(i)=(F(i)-F0) / M Wherein, F(i) is the measured rolling force of the ith pass; F0: rough rolling zero adjustment pressure; M: rough rolling mill stiffness; The method of calculating the slab outlet thickness of the previous pass according to the measured flat roll gap and the bouncing roll gap of the previous pass includes: the slab outlet thickness of the previous pass = the measured flat roll gap of the previous pass + (the bouncing roll gap of the previous pass + the roll system deformation - the oil film thickness) - the zero adjustment position; According to the slab outlet thickness of the previous pass and the relative reduction rate of the flat rollers of the current pass, the method of calculating the slab outlet thickness of the current pass includes: the current pass outlet thickness = the previous pass outlet thickness - the current pass flat roller relative reduction rate × the previous pass outlet thickness; The method of recalculating the flat roll gap of the current pass according to the slab outlet thickness of the current pass includes: the flat roll gap of the current pass = the slab outlet thickness of the current pass - (the bounce roll gap of the current pass + the deformation of the roller system - the oil film thickness) + the zero adjustment position; A vertical roll gap correction calculation module is used to recalculate the vertical roll gap of the current pass according to the measured vertical roll rolling force and the measured vertical roll gap of the previous pass, so as to obtain a corrected vertical roll gap of the current pass; A vertical roll opening correction calculation module is used to recalculate the guide plate opening degree at the entrance side and the guide plate opening degree at the exit side of the current pass according to the measured vertical roll gap of the previous pass and the rough rolling exit width gauge data, so as to obtain the corrected guide plate opening degree at the entrance side and the guide plate opening degree at the exit side of the current pass; The correction module is used to send the corrected flat roll gap, flat roll rolling force, vertical roll gap, inlet side guide plate opening and outlet side guide plate opening of the current pass to the rough rolling mill control end to complete the rough rolling pass correction control.

Images