CN113751502B - Method for rolling same cold-rolled steel strip into different thicknesses - Google Patents
Method for rolling same cold-rolled steel strip into different thicknesses Download PDFInfo
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- CN113751502B CN113751502B CN202110895956.2A CN202110895956A CN113751502B CN 113751502 B CN113751502 B CN 113751502B CN 202110895956 A CN202110895956 A CN 202110895956A CN 113751502 B CN113751502 B CN 113751502B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
- B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/24—Automatic variation of thickness according to a predetermined programme
- B21B37/26—Automatic variation of thickness according to a predetermined programme for obtaining one strip having successive lengths of different constant thickness
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a method for rolling the same cold-rolled steel strip with different thicknesses, which adopts a reciprocating rolling process, and changes a rolling deformation area by repeatedly re-marking the stroke position of a tension cylinder, so that samples with various thicknesses are obtained from the same cold-rolled raw material, and are used for comparing and researching mechanical properties and the like. The method successfully realizes that the same test material can be used for producing samples with different thickness specifications, and is more beneficial to performance comparison.
Description
Technical Field
The invention relates to the field of steel rolling control, in particular to a method for rolling the same cold-rolled steel strip to different thicknesses.
Background
Currently, the patent of application number 201310478174.4 discloses a rolling method of a cold-rolled steel strip. The straightening machine straightening strip head is arranged in front of an original rolling mill housing, a CPC centering device is arranged on an uncoiler to center a strip into the rolling mill housing for rolling, a main rolling mill is a six-roller rolling mill with an upper middle roller and a lower middle roller having an axial transverse movement function and an upper working roller and a lower working roller having a positive roller and a negative roller bending function, an AGC hydraulic pressure reduction control system is additionally arranged on the main rolling mill, an X-ray thickness gauge is respectively arranged in front of the main rolling mill and behind the main rolling mill, a vacuum oil removing device is respectively arranged in front of the main rolling mill and behind the main rolling mill, and an upper exhaust knife and a lower exhaust knife are respectively arranged in front of the main rolling mill and behind the main rolling mill. The pickled steel strip is rolled by five steps of uncoiling preparation, threading rolling, reversible rolling, finished product rolling and coil stripping, so that the technical problems that the working rolls need original convexity, the diameters of the working rolls are difficult to reduce, the roll bending cannot effectively play a role, the stock quantity of the standby working rolls and the roll consumption are increased and the thickness control precision and the surface cleanliness are improved.
The patent of application number 201410148617.8 discloses a control method for thickening and rolling the head of cold-rolled strip steel. The method is judged by an industrial computer in real time, if the set rolling thickness of the current steel coil is smaller than 0.3mm, when the head of the cold-rolled strip steel runs to be within 4m from a first cold rolling mill, the thickness value of 0.25mm is automatically increased on the basis of the set rolling thickness value of the strip steel; 2) Converting the thickness value into an additional speed factor of the cold rolling mill through an industrial computer, inputting the additional speed factor into a speed slope generator program module, generating a speed output value of each rolling mill, controlling the speed of each rolling mill, and automatically performing strip steel head thickening rolling; 3) When the distance between the head of the strip steel and the last sub-cold rolling mill is more than 15m, automatically stopping thickening rolling of the head of the strip steel, and recovering the rolling thickness to be the set value thickness issued by an industrial computer database. The problem that manual judgment errors are easy to occur because operators manually select the thickening rolling of the head of the cold-rolled strip steel, and even forget to select the thickening of the head of the strip steel, the head of the strip steel is too small in thickness and insufficient in hardness and is wound on a coiling machine, a steel coil cannot be dismounted, only the steel coil can be cut and damaged, and therefore finished steel coils are wasted and a large amount of production time is consumed.
The patent of application number 201710014476.4 discloses a rolling method for cold-rolled variable-thickness plates. The invention is characterized in that: (1) setting a target profile of a finished plate to be rolled; (2) Setting the number of rolling passes and the reduction of each pass in the rolling process according to the specification of the incoming material, the target profile of the finished plate and the capacity of the rolling mill; (3) setting a target plate shape for each pass; (4) performing variable-thickness rolling on the incoming material in each pass. The rolling reduction is shared by a plurality of (more than or equal to 2) passes, so that the strip shape and the surface quality of the strip can be ensured, the rolling reduction is particularly suitable for rolling thick products with the thickness difference of nearly 50%, and the requirements of critical deformation of the thin area and the thick area are met. Solves the problem that the prior variable-thickness plate rolling cannot ensure the plate shape and the surface quality.
Disclosure of Invention
In order to solve the problems that repeated loading and unloading are carried out in the rolling process and test samples with different thickness specifications of the same material cannot be provided due to shortage of raw materials, the invention aims to provide a method for rolling the same cold-rolled steel strip with different thicknesses.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for rolling different thicknesses of the same cold-rolled steel strip, comprising:
s1, strip steel sample feeding
Lifting the roll gap to enable the strip steel to pass through the roller, clamping a strip steel sample by using a clamp of a tension cylinder at one side, controlling the tension cylinder at the clamping side to stretch out for feeding, slowly rotating the roller to enable the strip steel to pass through the roller smoothly, feeding the tension cylinder to a limit position, and stopping stretching out the tension cylinder and stopping rotating the roller; the clamping device extends out of the tension cylinder clamp device at the other side to clamp the sample, and the tension cylinder clamps at the two sides clamp the sample firmly; the initial roll gap is set, the knob is controlled to be pressed down for pre-pressing the strip steel, the rolling force is observed, the tension setting is adjusted, tension cylinders on two sides output the tension of the strip steel, so that the strip steel is straightened, and the feeding is completed;
s2, selecting the running mode of the rolling mill,
selecting a linkage mode to synchronize the rotation linear speed of the roller with the horizontal movement speed of the tension cylinder;
limiting and clearing the tension cylinder to ensure that the tension cylinder outputs full stroke, thereby realizing rolling of the strip steel in the maximum deformation zone;
rolling the first thickness: the rolling reduction is gradually adjusted, and the first thickness specification is obtained through multi-pass rolling. As in fig. 3.
And (3) rolling the second thickness: and (3) recalibrating the stroke position of the tension cylinder, determining a second thickness rolling area, gradually adjusting the rolling reduction, and rolling the second thickness specification through multiple passes. As in fig. 4.
Third and fourth thickness rolling: repeating the Zhang Ligang stroke position and adjusting the rolling reduction to roll to realize rolling of third and fourth thickness specifications;
s3, unloading
And (3) resetting tension setting, namely selecting a single-action mode, lifting the roll gap, loosening a clamp of a tension cylinder on one side, rotating a roller, simultaneously retracting the clamp of the tension cylinder on the other side, simultaneously withdrawing the strip steel from the rolling mill, loosening the clamp, taking down the finished product of the strip steel, and finishing variable-thickness rolling.
Further, the method also comprises the step of removing surface iron scales from the strip steel sample by acid washing before feeding, and displaying the natural color of the steel.
A system for realizing the method of rolling the same cold-rolled steel strip with different thicknesses comprises a four-roller reversible experimental rolling mill, a matched PLC control system, a process machine and an HMI human-machine interface system; the HMI human-computer interface system is used for monitoring the sample rolling process, changing process parameters and carrying out sample reciprocating rolling through an operation button; the PLC control system is used for collecting rolling process data and accurately controlling the rolling speed, the thickness reduction, the stepping position of the tension cylinder and the like of the strip steel according to the operation instruction.
Compared with the prior art, the invention has the beneficial technical effects that:
in the reciprocating cold rolling process, after an experimental steel strip is rolled to a first thickness specification, the initial position of a tension cylinder is re-marked, the position of a second (or a third) deformation zone is changed, the second (or third) thickness rolling is carried out according to a pre-designed process, and products with different thickness specifications are produced from the same raw material, so that a series of repeated rolling operation processes of feeding, roll gap adjustment and the like are solved, and meanwhile, the problem that under the condition that cold rolling raw materials are short of, the same cold rolling raw material is developed to roll products with various thickness specifications is solved, so that samples with different compression ratios of the same raw material are provided for researching mechanical properties, tissue properties and the like.
The test material can be used for successfully producing samples with different thickness specifications by the same test material, and the performance comparison is facilitated.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 is a cold rolling mill layout;
FIG. 2 is a cold rolling loading diagram;
FIG. 3 is a schematic view of rolling a first thickness;
FIG. 4 is a schematic diagram of a recalibration rolling second thickness;
FIG. 5 is a schematic diagram of a third thickness of the recalibration by calibration;
FIG. 6 is a schematic diagram comparing the final product specification with the raw material specification.
Detailed Description
A method for rolling the same cold-rolled steel strip with different thicknesses comprises the following steps:
acid washing, clamping feeding, pre-pressing, tension setting, linkage synchronous selection, calibrating a rolling area, adjusting the rolling reduction to reciprocally roll a first thickness, recalibrating a second rolling area, adjusting the rolling reduction to reciprocally roll a second thickness, repeating the process to roll to an Nth thickness, returning the tension to zero, lifting a roll gap, single-action selection, loosening Zhang Ligang discharging and rolling.
The specific technical scheme is as follows:
a four-roller reversible experimental rolling mill is adopted, as arranged in fig. 1, and is matched with a PLC control system, a process machine and an HMI human-machine interface system. The man-machine interface monitors the sample rolling process, changes the process parameters, and performs sample reciprocating rolling through the operation buttons. The PLC system collects rolling process data and precisely controls the rolling speed, thickness reduction, stepping position of the tension cylinder and the like of the strip steel according to the operation instruction. The specific operation process is as follows:
and (5) pickling the strip steel sample to remove the surface iron scale, and displaying the natural color of the strip steel.
Strip steel sample feeding:
and lifting the roll gap to enable the strip steel to pass through the roll, clamping a strip steel sample by using a clamp of a tension cylinder at one side, controlling the tension cylinder at the clamping side to stretch out for feeding, slowly rotating the roll to enable the strip steel to pass through the roll smoothly, feeding the tension cylinder to a limit position, and stopping stretching out the tension cylinder and stopping rotating the roll. The clamping device extends out of the tension cylinder clamp device at the other side to clamp the sample, and the tension cylinder clamps at the two sides clamp the sample firmly. The initial roll gap (namely, the thickness of the raw materials) is set, the pressing knob is controlled to press the strip steel in a pre-pressing mode, the rolling force is observed to be about 100kN (the pre-pressing rolling force is reasonably adjusted according to the material of the strip steel), the tension setting is adjusted, tension cylinders on two sides output tension to the strip steel, and the strip steel is straightened, and the feeding is completed. As shown in fig. 2.
Selecting a rolling mill operation mode:
the control button selects a linkage mode to synchronize the rotation linear speed of the roller with the horizontal movement speed of the tension cylinder.
And the limit of the tension cylinder is cleared, so that the tension cylinder outputs full stroke, and rolling of the strip steel maximum deformation zone is realized.
And rolling the first thickness, gradually adjusting the rolling reduction, and rolling to the first thickness specification through multiple passes. As shown in fig. 3.
And (3) rolling the second thickness, recalibrating the stroke position of the tension cylinder, determining a second thickness rolling area, gradually adjusting the rolling reduction, and rolling the second thickness specification through multiple passes. As shown in fig. 4.
And rolling the third thickness and the fourth thickness, and repeating the Zhang Ligang stroke position and the rolling reduction adjustment to realize rolling of the third thickness and the fourth thickness. As shown in fig. 5.
And (3) unloading:
and resetting tension setting, wherein a control button selects a single-action mode, a roll gap is lifted, a clamp of a tension cylinder on one side is loosened, a roll is rotated, the clamp of the tension cylinder on the other side is retracted, strip steel is withdrawn from a rolling mill, the clamp is loosened, a finished product of the strip steel is taken down, and variable-thickness rolling is completed. The pair of rolled product and stock is shown in fig. 6.
The cold rolling experimental process is implemented by recalibrating the left and right Zhang Ligang positions of a single side after rolling to finish the first thickness specification, and the recalibration position of the single side tension cylinder is equal to the length dimension of a sample required by subtracting the required first thickness from the current position of the tension cylinder as shown in fig. 4. And calibrating the second thickness rolling area and the third thickness rolling area in the same way.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (3)
1. A method for rolling the same cold-rolled steel strip with different thicknesses is characterized by comprising the following steps: comprising the following steps:
s1, strip steel sample feeding
Lifting the roll gap to enable the strip steel to pass through the roll, clamping a strip steel sample by using a clamp of a tension cylinder at one side, controlling the tension cylinder at the clamping side to stretch out for feeding, slowly rotating the roll to enable the strip steel to pass through the roll smoothly, feeding the tension cylinder to a limit position, and stopping stretching out the tension cylinder and stopping rotating the roll; the clamping device extends out of the tension cylinder clamp device at the other side to clamp the sample, and the tension cylinder clamps at the two sides clamp the sample firmly; the initial roll gap is set, the knob is controlled to be pressed down for pre-pressing the strip steel, the rolling force is observed, the tension setting is adjusted, tension cylinders on two sides output the tension of the strip steel, so that the strip steel is straightened, and the feeding is completed;
s2, selecting the running mode of the rolling mill,
selecting a linkage mode to synchronize the rotation linear speed of the roller with the horizontal movement speed of the tension cylinder;
limiting and clearing the tension cylinder to ensure that the tension cylinder outputs full stroke, thereby realizing rolling of the strip steel in the maximum deformation zone;
rolling the first thickness: gradually adjusting the rolling reduction, and rolling to a first thickness specification through multiple passes;
and (3) rolling the second thickness: recalibrating the stroke position of the tension cylinder, determining a second thickness rolling area, gradually adjusting the rolling reduction, and rolling a second thickness specification through multiple passes;
third and fourth thickness rolling: repeating the Zhang Ligang stroke position and adjusting the rolling reduction to roll to realize rolling of third and fourth thickness specifications;
s3, unloading
And (3) resetting tension setting, namely selecting a single-action mode, lifting the roll gap, loosening a clamp of a tension cylinder on one side, rotating a roller, simultaneously retracting the clamp of the tension cylinder on the other side, simultaneously withdrawing the strip steel from the rolling mill, loosening the clamp, taking down the finished product of the strip steel, and finishing variable-thickness rolling.
2. The method for rolling different thicknesses of the same cold-rolled steel strip according to claim 1, characterized in that: the method also comprises the step of removing surface iron scales of the strip steel sample by acid washing before feeding, and displaying the natural color of the steel.
3. A system for implementing the method for rolling the same cold-rolled steel strip with different thicknesses according to claim 1, characterized in that: the device comprises a four-roller reversible experimental rolling mill, a matched PLC control system, a process machine and an HMI human-machine interface system; the HMI human-machine interface system is used for monitoring the sample rolling process, changing process parameters and carrying out sample reciprocating rolling through an operation button; the PLC control system is used for collecting rolling process data and accurately controlling the rolling speed, the thickness reduction and the stepping position of the tension cylinder according to the operation instruction.
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| CN202110895956.2A CN113751502B (en) | 2021-08-05 | 2021-08-05 | Method for rolling same cold-rolled steel strip into different thicknesses |
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| CN202110895956.2A CN113751502B (en) | 2021-08-05 | 2021-08-05 | Method for rolling same cold-rolled steel strip into different thicknesses |
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| CN115608775B (en) * | 2022-12-16 | 2023-03-17 | 江苏甬金金属科技有限公司 | Reciprocating type high-strength titanium alloy steel plate cold rolling device |
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| JPS6021107A (en) * | 1983-07-18 | 1985-02-02 | Nippon Kokan Kk <Nkk> | Production of differential thickness plate |
| CN1850374A (en) * | 2006-04-29 | 2006-10-25 | 东北大学 | Method for rolling step-thickness steel plate |
| CN104338752B (en) * | 2013-07-24 | 2016-08-10 | 宝山钢铁股份有限公司 | A kind of length control method during Varying-thickness rolling |
| JP6135390B2 (en) * | 2013-08-09 | 2017-05-31 | 新日鐵住金株式会社 | Work roll or backup roll processing method for use in differential thickness steel plate manufacturing equipment |
| CN104741377B (en) * | 2015-03-30 | 2017-01-04 | 宝山钢铁股份有限公司 | There is the milling method of the sheet material of longitudinal different-thickness |
| CN106513436B (en) * | 2016-12-02 | 2018-02-16 | 东北大学 | A kind of milling method of one side periodic variable-thickness Strip |
| CN108284130A (en) * | 2017-01-09 | 2018-07-17 | 宝山钢铁股份有限公司 | A kind of milling method of cold rolling Varying-thickness plank |
| CN106975664A (en) * | 2017-05-27 | 2017-07-25 | 辽宁科技大学 | A kind of micro- milling method of very thin variable-thickness strip |
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