CN115740025A - Rolling method for reducing longitudinal unevenness of ultra-thick plate alloy - Google Patents
Rolling method for reducing longitudinal unevenness of ultra-thick plate alloy Download PDFInfo
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- CN115740025A CN115740025A CN202211653520.3A CN202211653520A CN115740025A CN 115740025 A CN115740025 A CN 115740025A CN 202211653520 A CN202211653520 A CN 202211653520A CN 115740025 A CN115740025 A CN 115740025A
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Abstract
The invention discloses a rolling method for reducing the longitudinal unevenness of an ultra-thick plate alloy, which comprises the following steps: determining the number of initial transition passes, strong deformation passes and finished product passes, and the rolling reduction and rolling force of each pass; controlling the plates to enter each initial transition pass in sequence; controlling the plate to enter each strong deformation pass; controlling the plate to move continuously, controlling the roll gap distance of the rollers in the finished product pass to increase a preset distance before each finished product pass is started, controlling the roll gap distance to decrease the preset distance after the plate moves to the preset length of the front end of the roller in the finished product pass, controlling the plate to be rolled reversely after the plate is rolled in the pass, and controlling the plate to move reversely again to the next finished product pass or finish rolling after the plate is rolled in the pass again; the preset distance is larger than the rolling reduction of the corresponding finished product pass. The method avoids the buckle head defect formed by the plate biting, reduces the longitudinal unevenness, reduces the straightening process, and saves time, energy and labor cost.
Description
Technical Field
The invention relates to the field of rolling methods, in particular to a rolling method for reducing the longitudinal unevenness of an ultra-thick plate alloy.
Background
Due to the limitation of the size of a cast ingot, the rolling of the ultra-thick plate alloy is often limited by the insufficient amount of metal, the minimum incoming material length of a stretcher cannot be met, and stretching and straightening cannot be performed, so that the plate shape formed by hot rolling is the final finished plate shape.
In the prior art, because the types of rolling mills are limited, the middle-lower horizontal line of the rolling mill is fixed and cannot be adjusted, the climbing type gripping fixed stub bar can be buckled, and the product with high requirement on longitudinal unevenness is difficult to meet the requirement. The existing production method does not consider the capacity limit of equipment, so that the unevenness of a plurality of batches of products exceeds the standard, the condition that the equipment limit cannot be stretched and straightened is caused, the yield is lost, the product cannot be timely guaranteed, and a user cannot use the product if the product is normally delivered out of a factory, so that the quality complaint problem is caused, and the income and image of an enterprise are influenced.
Therefore, how to effectively reduce the unevenness of the ultra-thick plate alloy and improve the yield is a technical problem which needs to be solved by the technical personnel in the field at present.
Disclosure of Invention
The invention aims to provide a rolling method for reducing the longitudinal unevenness of an ultra-thick plate alloy, which is used for improving the rolling quality of the ultra-thick plate alloy, reducing the unevenness and meeting the subsequent processing requirement.
In order to achieve the purpose, the invention provides the following technical scheme:
a rolling method for reducing the longitudinal unevenness of an ultra-thick plate alloy comprises the following steps:
step S1: determining the number of initial transition passes, strong deformation passes and finished product passes, and the rolling reduction and rolling force of each pass;
step S2: controlling the plate to enter each initial transition pass in sequence, and rolling the head and the tail of the plate body until the shape of the plate body is matched with that of the roller;
and step S3: controlling the plate to enter each strong deformation pass until the thickness of the plate body is a strong deformation target thickness;
and step S4: controlling the plate to continuously move, controlling the roll gap distance of the roller in each finished product pass to increase a preset distance before the plate enters each finished product pass, controlling the roll gap distance to decrease the preset distance after the plate moves to the preset length of the front end of the roller in each finished product pass, controlling the plate to be reversely rolled after the plate is rolled in the pass, and controlling the plate to reversely move to the next finished product pass or finish rolling after the plate is rolled in the pass; the preset distance is larger than the rolling reduction corresponding to the finished product pass.
Preferably, the step S4 further includes controlling the feeding speed of the roller in the final pass to be 15-25m/min before the plate is moved to the preset length of the front end of the final pass, and controlling the feeding speed of the roller to return to the target speed after the plate is moved to the preset length of the front end of the roller in the final pass.
Preferably, in the step S4, the preset length is 20% to 40% of the total length of the plate.
Preferably, in step S1, the number of passes of the initial transition pass is 1 or 2, and the number of passes of the final product pass is 2 or 3.
Preferably, the reduction of each pass in the initial transition pass is 10-15mm.
Preferably, the reduction of each pass in the strong deformation pass is 30-50mm.
Preferably, the reduction of each pass in the finished product pass is 4-6mm.
Preferably, the rolling force of each pass in the finished product passes is 600-1000T.
Preferably, the method further comprises the steps of:
and closing an AGC thickness control program in the finished product pass.
Preferably, the method further comprises the steps of:
and closing the emulsion spraying program in the finished product pass.
The rolling method for reducing the longitudinal unevenness of the ultra-thick plate alloy provided by the invention comprises the following steps: step S1: determining the number of initial transition passes, strong deformation passes and finished product passes, and the rolling reduction and rolling force of each pass; step S2: controlling the plate to enter each initial transition pass in sequence, and rolling the head and the tail of the plate body until the shape of the plate body is matched with that of the roller; and step S3: controlling the plate to enter each strong deformation pass until the thickness of the plate body is a strong deformation target thickness; and step S4: controlling the plate to continuously move, controlling the roll gap distance of the roller in each finished product pass to increase a preset distance before the plate enters each finished product pass, controlling the roll gap distance to decrease the preset distance after the plate moves to the preset length of the front end of the roller in each finished product pass, controlling the plate to be reversely rolled after the plate is rolled in the pass, and controlling the plate to reversely move to the next finished product pass or finish rolling after the plate is rolled in the pass; and the preset distance is greater than the rolling reduction corresponding to the finished product pass. According to the rolling method provided by the invention, the biting process of the plate is reduced in the finished product pass, the plate is rolled after the plate exceeds the finished product pass by a preset length, then the rolling process of the front end of the plate body in the pass is completed through the reverse rolling process, and the front end and the rear end of the plate do not need to be bitten, so that the head buckling defect of the plate due to biting is effectively avoided, the longitudinal unevenness of the ultra-thick plate alloy is fundamentally reduced, the straightening process is reduced, and the time, the energy and the labor cost are saved.
In a preferred embodiment, the step S4 further includes controlling the feeding speed of the rolls in the final pass to be 15-25m/min before the plate is moved to the preset length of the front end of the final pass, and controlling the feeding speed of the rolls to return to the target speed after the plate is moved to the preset length of the front end of the rolls in the final pass. According to the arrangement, before the plate does not move to the set position, the roller in the finished product pass is controlled to rotate at the lowest speed for feeding, so that the roller gap distance is reduced by the preset distance at the set position, and the phenomenon that the plate is buckled or turned over due to the fact that the roller gap distance cannot be timely recovered due to the fact that the plate moves at the too high speed is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of one embodiment of the rolling method for reducing longitudinal unevenness of an ultra-thick plate alloy according to the present invention;
FIG. 2 is a flow chart of another embodiment of the rolling method for reducing longitudinal unevenness of an ultra-thick plate alloy provided by the invention.
Detailed Description
The core of the invention is to provide a rolling method for reducing the longitudinal unevenness of the super-thick plate alloy, which can reduce the longitudinal unevenness of the super-thick plate alloy, improve the yield, and has low cost and convenient control.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 and fig. 2, fig. 1 is a flow chart of an embodiment of the rolling method for reducing the longitudinal unevenness of the ultra-thick plate alloy according to the present invention; FIG. 2 is a flow chart of another embodiment of the rolling method for reducing the longitudinal unevenness of the ultra-thick plate alloy provided by the invention.
In this embodiment, the rolling method for reducing the longitudinal unevenness of an ultra-thick plate alloy comprises the steps of:
step S1: determining the number of initial transition passes, strong deformation passes and finished product passes, and the rolling reduction and rolling force of each pass; the method can be specifically set according to the type of the plate, the rolling thickness and the conditions of rolling equipment;
step S2: controlling the plate to enter each initial transition pass in sequence, and rolling the head and the tail of the plate body until the shape of the plate body is matched with that of the roller; specifically, the edge position of a cuboid blank can be rolled into an arc shape from an edge angle, and the cuboid blank can be better matched with a roller, so that the cuboid blank can be conveniently bitten in a strong deformation pass;
and step S3: controlling the plate to enter each strong deformation pass, and carrying out strong deformation on the plate until the thickness of the plate body is the target thickness of strong deformation; the target thickness of the strong deformation is the thickness of the finished product of the plate body minus the total rolling thickness of each finished product pass;
and step S4: controlling the plate to move continuously, controlling the roll gap distance of the roller in the finished product pass to increase a preset distance before the plate enters each finished product pass, controlling the roll gap distance to decrease the preset distance after the plate moves to the preset length of the front end of the roller in the finished product pass, controlling the plate to be rolled reversely after the plate is rolled in the pass, and controlling the plate to move reversely again to the next finished product pass or finish rolling after the plate is rolled in the pass again; the preset distance is greater than the rolling reduction of the corresponding finished product pass.
Specifically, the ultra-thick plate alloy refers to a plate with the thickness of more than or equal to 120mm, before the plate enters each finished product pass, the roll gap distance of the roll in the finished product pass is controlled to be increased by a preset distance, the preset distance is larger than the rolling reduction corresponding to the finished product pass, that is, before the plate begins to enter the roll of the finished product pass, the thickness of the plate is smaller than the roll gap distance, so that the plate does not have the problem of biting, after the plate continuously moves to the preset length of the roll beyond the finished product pass, the roll gap distance is adjusted to be proper rolling reduction from the middle of the plate, then the plate is reversely moved, at the moment, the roll gap distance of the roll at the rear end of the plate is not changed, when the plate is reversely moved, the plate does not need to be bitten, when the plate moves for a certain length, the length is the total length of the plate minus the preset length, at the moment, the finished product at the front end of the plate begins to roll the front end of the plate, and the thickness adjustment of the pass is completed; and (5) after the processing of the pass is finished, continuing to rotate the roller, continuing to move the plate to the next finished pass, repeating the step S4, continuing to finish the processing of the next pass, and discharging after all passes are finished.
According to the rolling method provided by the invention, the biting process of the plate is reduced in the finished product pass, the plate is rolled after the plate exceeds the preset length of the finished product pass, then the rolling process of the front end of the plate body in the pass is completed through the reverse rolling process, and the front end and the rear end of the plate do not need to be bitten, so that the head buckling defect caused by biting of the plate is effectively avoided, the longitudinal unevenness of the ultra-thick plate alloy is fundamentally reduced, the straightening process is reduced, and the time, the energy and the labor cost are saved.
In some embodiments, step S4 further includes controlling the feeding speed of the rolls in the final pass to be 15-25m/min before the plate is moved to the preset length of the front end of the final pass, and controlling the feeding speed of the rolls to return to the target speed after the plate is moved to the preset length of the front end of the rolls in the final pass. According to the arrangement, before the plate does not move to the set position, the roller in the finished product pass is controlled to rotate at the lowest speed for feeding, so that the distance between the roller gaps is reduced by the preset distance at the set position, and the defect that the plate is buckled or turned over due to the fact that the distance between the roller gaps cannot be recovered timely because the plate moves at an excessively high speed is avoided.
In some embodiments, in step S4, the preset length is 20% to 40%, preferably 30% to 35%, of the total length of the plate, and is set to avoid that the preset length is too large to cause the front end of the plate to tilt down, and to avoid that the preset length is too short to cause the front end of the plate to tilt up.
In some embodiments, in step S1, the number of passes in the initial transition pass is 1 or 2, and the number of passes in the final product pass is 2 or 3.
Specifically, the total number of the initial transition pass, the strong deformation pass and the finished product pass is N, and the number of the strong deformation pass = the total number of the passes N — the number of the initial transition pass and the number of the finished product pass. The total number of passes N depends on the total thickness of the rolled sheet, the material of the sheet, the properties of the rolls, etc.
In some embodiments, the reduction in each pass in the initial transition pass is 10-15mm, and the reduction in each pass in the initial transition pass may be relatively small to facilitate subsequent biting.
In some embodiments, the rolling reduction of each pass in the strong deformation pass is 30-50mm, and the strong deformation stage is entered, so that the cast structure is changed into the processed structure as soon as possible, and the rolling reduction can be increased.
In some embodiments, the reduction of each pass in the finished product pass is 4-6mm, preferably 5mm, and the small reduction is set to ensure the rolling quality of the plate and improve the dimensional accuracy.
In some embodiments, the rolling force of each pass in the final pass is 600-1000T. Specifically, the rolling force of the finished product pass is selected, the rolling reduction of the finished product pass is preferably 5mm, the rolling force cannot be too large, generally the rolling force can be selected from 600-1000T, so that the difference of the rolled materials on the same plate difference in the longitudinal direction is not large, and the plate shape is good.
In some embodiments, further comprising the step of:
and closing the AGC thickness control program in the finished product pass. Specifically, the thickness meter is automatically controlled to be closed, and because the rolling mode adopted in the finished product pass is in conflict with the AGC thickness control program, the automatic control of the thickness meter is closed when the rolling in the finished product pass is activated, and the adjustment of the rolling reduction is manually interfered.
In some embodiments, further comprising the step of:
and closing the emulsion spraying program in the finished product pass. Specifically, the emulsion of the initial transition pass and the strong deformation pass is normally used, and when the final finished product is rolled, the used emulsion can be sintered to form oil spots due to the low speed of the main machine, and the emulsion is not sprayed at the moment.
In a specific embodiment, the initial transition pass is reduced, the high-reduction-amount tissue improvement stage is entered as soon as possible, namely the high-deformation pass, which affects the thickness of the finished product of the ultra-thick plate, the total processing rate is limited, the low reduction amount is adopted in the first 1-2 passes, the thickness is about 10-15mm, and the head and the tail of the rough material form a contact amplitude similar to the shape of a roller so as to meet the biting condition in the high-deformation stage; starting to use large rolling reduction in the 3 rd pass, entering a strong deformation stage, and enabling the cast structure to be changed into a processed structure as soon as possible, wherein the rolling reduction is controlled to be about 30-50 mm; and (3) a finished product pass control mode: in the last two passes, when the thickness is about +10mm of the target thickness value, entering a plate shape control and thickness control stage, namely a pass stage, wherein the reduction amount is controlled to be 5mm, the roller is lifted by oil pressure for about 8mm when biting, the roller is rotated at the lowest speed for feeding, when the length of the front third of the plate material length is reached, the gap distance of the roller is pressed to the target thickness by oil pressure, and meanwhile, the roller does not stop rotating, and the material feeding and the pressing are carried out simultaneously; the process is repeated by reverse rolling, so that the defect of head buckling caused by head biting is effectively avoided.
The rolling method for reducing the longitudinal unevenness of the ultra-thick plate alloy provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A rolling method for reducing the longitudinal unevenness of an ultra-thick plate alloy is characterized by comprising the following steps:
step S1: determining the number of initial transition passes, strong deformation passes and finished product passes, and the rolling reduction and rolling force of each pass;
step S2: controlling the plate to enter each initial transition pass in sequence, and rolling the head and the tail of the plate body until the shape of the plate body is matched with that of the roller;
and step S3: controlling the plate to enter each strong deformation pass until the thickness of the plate body is a strong deformation target thickness;
and step S4: controlling the plate to continuously move, controlling the roll gap distance of the roller in each finished product pass to increase a preset distance before the plate enters each finished product pass, controlling the roll gap distance to decrease the preset distance after the plate moves to the preset length of the front end of the roller in each finished product pass, controlling the plate to be reversely rolled after the plate is rolled in the pass, and controlling the plate to reversely move to the next finished product pass or finish rolling after the plate is rolled in the pass; and the preset distance is greater than the rolling reduction corresponding to the finished product pass.
2. The rolling method for reducing the longitudinal unevenness of an ultra-thick plate alloy according to claim 1, wherein the step S4 further comprises controlling the feeding speed of the rolls in the finishing pass to be 15-25m/min before the plate is moved to the preset length of the front end of the finishing pass, and controlling the feeding speed of the rolls to return to the target speed after the plate is moved to the preset length of the front end of the rolls in the finishing pass.
3. The rolling method for reducing the longitudinal unevenness of an ultra-thick plate alloy according to claim 1, wherein the predetermined length in the step S4 is 20 to 40 percent of the total length of the plate.
4. The rolling method for reducing the longitudinal unevenness of an ultra-thick plate alloy according to claim 1, wherein in the step S1, the number of the initial transition pass is 1 or 2, and the number of the final pass is 2 or 3.
5. The rolling method for reducing the longitudinal unevenness of an ultra-thick plate alloy according to claim 1, wherein the reduction of each pass in the initial transition pass is 10-15mm.
6. The rolling method for reducing the longitudinal unevenness of an ultra-thick plate alloy according to claim 1, wherein the reduction of each pass in the strong deformation pass is 30-50mm.
7. The rolling method for reducing the longitudinal unevenness of an ultra-thick plate alloy according to claim 1, wherein the reduction in each pass of the finished product is 4-6mm.
8. The rolling method for reducing the longitudinal unevenness of an ultra-thick plate alloy according to claim 1, wherein the rolling force of each pass in the final pass is 600 to 1000T.
9. The rolling method for reducing the longitudinal unevenness of an ultra-thick plate alloy according to any one of claims 1 to 8, further comprising the steps of:
and closing the AGC thickness control program in the finished product pass.
10. The rolling method for reducing the longitudinal unevenness of an ultra-thick plate alloy according to any one of claims 1 to 8, further comprising the steps of:
and closing the emulsion spraying program in the finished product pass.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211653520.3A CN115740025A (en) | 2022-12-21 | 2022-12-21 | Rolling method for reducing longitudinal unevenness of ultra-thick plate alloy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211653520.3A CN115740025A (en) | 2022-12-21 | 2022-12-21 | Rolling method for reducing longitudinal unevenness of ultra-thick plate alloy |
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| CN115740025A true CN115740025A (en) | 2023-03-07 |
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| CN202211653520.3A Pending CN115740025A (en) | 2022-12-21 | 2022-12-21 | Rolling method for reducing longitudinal unevenness of ultra-thick plate alloy |
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