CN108637022B - Method for accurately calibrating rough rolling horizontal roll gap - Google Patents
Method for accurately calibrating rough rolling horizontal roll gap Download PDFInfo
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- CN108637022B CN108637022B CN201810486372.8A CN201810486372A CN108637022B CN 108637022 B CN108637022 B CN 108637022B CN 201810486372 A CN201810486372 A CN 201810486372A CN 108637022 B CN108637022 B CN 108637022B
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/10—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-gap, e.g. pass indicators
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Abstract
The invention relates to a method for accurately calibrating a rough rolling horizontal roll gap, which is characterized by comprising the following steps of: comprises the following steps that D1 is dynamically pressed against the working roll for the first time to reach a calibrated rolling force FSign boardEliminating equipment clearance; d2 second dynamic pressing against working roll to nominal rolling force FSign boardConfirming the work rollThe rolling force deviation conforms to the range; d3 static copper bar pressing calibration and leveling of a horizontal roll gap; d4 dynamic pressing working roll for the third time to the nominal rolling force FSign boardEliminating roll bounce; and D5, clearing the roll gap, lifting the working roll, finishing the calibration process and normally carrying out rolling production. The invention considers the state of the roughing mill under the real production condition, utilizes the advanced dynamic pressing before calibration to eliminate the adverse effect of roller bounce and rolling mill clearance on the calibration precision to the maximum extent; meanwhile, a rolling force deviation leveling idea is introduced, and leveling is comprehensively carried out by utilizing a method of combining copper bar pressing leveling and calibrated rolling force deviation compensation, so that the roll gap level of the rolling mill under normal load production is comprehensively improved.
Description
Technical Field
The invention relates to the technical field of hot rolling, in particular to a method for accurately calibrating a rough rolling horizontal roll gap.
Background
In the prior art, after a supporting roller or other related equipment is replaced in rough rolling maintenance and other situations, the horizontal roll gap of a rough rolling mill is generally calibrated in a mode that a roller is pressed against a copper bar, and the roll gap deviation value at two sides of the roller is reflected and adjusted by measuring the thickness difference at two sides of the extruded copper bar, so that the aim of leveling the horizontal roll gap of the rough rolling mill is fulfilled. The specific leveling principle is shown in fig. 1. In fig. 1, point A, B is the center position of the roughing mill screw or hydraulic cylinder, point C, D is the position for placing the calibration copper bar, and point O is the center line of the work roll (rolling center line). The copper bar is symmetrically placed on a lower working roll by taking an O point as a center, a roll gap is pressed by the lower working roll to enable the upper working roll to be in contact with the copper bar to generate a certain rolling force, the section shape of the copper bar after being extruded by the roll gap is CC1D1D, the section shape of a horizontal roll gap of a rolling mill is AA1B1B, the thickness difference delta H between two ends of the copper bar after being pressed is hDD1-hCC1, and according to the similar triangle theorem, the delta H/delta H is (HBB1-HAA1)/(hDD1-hCC1) is AB/CD, so that the roll gap deviation delta H between the A point and the B point, namely the horizontal roll gap deviation of the rough rolling mill, is indirectly obtained.
Because the copper bar pressing process is that the roughing mill is statically pressed to a rolling force of hundreds of tons, the rolling force is small, and the influence of the gap between the rolling mill equipment on the roll gap calibration is not effectively eliminated, so that the thickness deviation of two sides obtained by directly pressing the copper bar cannot accurately reflect the real deviation of the roll gaps of two sides of the roll, the calibration data obtained by directly pressing the copper bar is low in accuracy, the calibration quality of the roughing roll cannot be guaranteed, the phenomena of poor plate shape and poor production stability after initial rolling often occur, and the production accident can be caused in serious cases.
In the prior art, the calibration mode of the horizontal roll gap of the roughing mill is single and fixed, and the calibration condition does not consider the influence of complex conditions such as the equipment clearance of the rolling mill, the bounce of the rolling mill and the like, so that the calibration result is not ideal, and the production stability of the calibrated roughing mill cannot be effectively ensured.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a method for accurately calibrating a rough rolling horizontal roll gap.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for accurately calibrating a rough rolling horizontal roll gap comprises the following steps:
d1 dynamic pressing working roller for the first time to reach the calibrated rolling force FSign boardEliminating equipment clearance
After the new supporting roll or the working roll is replaced, the rolling mill is firstly rotated, and the working roll is manually pressed down to ensure that the horizontal roll gap reaches the calibrated rolling force FSign boardAt the +/-20 t position, the roll is kept to rotate for 60 +/-10 s under the load, and the rolling force deviation of the working roll shows certain regularity and stability during calibration in each supporting roll period, so the calibration rolling force deviation delta F1 of the working roll is obtained+/-20 t is the standard, the horizontal roll gap of the machine roll of the sleeve is firstly pre-adjusted, and the roll gap is lifted at a low speed until the rolling force is not pressed after the pre-adjustment is finished;
d2 second dynamic pressing against working roll to nominal rolling force FSign boardConfirming the working roll rolling force deviation in accordance with the range
After the horizontal roll gap has been preset in D1, the work rolls are again pressed against the nominal rolling force FSign boardChecking whether the rolling force of the working roll is still within the range of delta F1 +/-20 t at the +/-20 t position, if so, lifting the horizontal roll gap at a low speed until the rolling force does not depend on the pressure, and then lifting the roll gap at a high speed until the diameter D of the calibrated copper rod is more than that of the calibrated copper rod, so that the copper rod calibration facility can be smoothly placed in the roll gap, otherwise, adjusting;
d3 static copper bar pressing calibration and leveling horizontal roll gap
The rolling mill is stopped, as shown in figure 1, two copper bars are placed at a preset position C, D of a lower working roll, the copper bars are statically pressed against a horizontal roll gap until the rolling force is 500t +/-50 t, the roll gap is lifted after the rolling force is kept about 30s +/-5 s, the copper bars are taken out, the thicknesses of the copper bars on two sides are measured by a micrometer, the thickness difference delta h of the two sides is calculated, and AB/CD times thickness deviation value adjustment is carried out on the roll gap according to the principle of similar triangles;
further, when the absolute value | delta h | of the thickness deviation of the copper rods on the two sides is less than or equal to 0.10mm, the roll gap can be not adjusted; when the absolute value of the deviation | delta h | is more than 0.50mm, the copper bar pressing leveling should be carried out again after the roll gap is correspondingly adjusted, and the leveling accuracy of the rough roll gap is improved by the method of combining the roll gap pre-adjusted by the rolling force deviation and the copper bar pressing leveling roll gap.
D4 dynamic pressing working roll for the third time to the nominal rolling force FSign boardTo eliminate bounce of the working roll
After the copper bar is pressed and the horizontal roll gap is leveled in the step D3, the rolling mill is turned, the working roll is manually pressed down, and the rolling mill is dynamically pressed against the calibrated rolling force FSign boardAt the +/-20 t position, the purpose of pressing at this time is to eliminate roller bounce, determine the zero position of the roll gap, and record the deviation value delta F2 after observing that the rolling force deviation of the working roller is stable, so as to be used as data reference for the next horizontal roll gap leveling;
and D5, clearing the roll gap, lifting the working roll, finishing the calibration process and normally carrying out rolling production.
The invention has the following beneficial effects: the invention considers the state of the roughing mill under the real production condition, utilizes the advanced dynamic pressing before calibration to eliminate the adverse effect of roller bounce and rolling mill clearance on the calibration precision to the maximum extent; meanwhile, a rolling force deviation leveling idea is introduced, and leveling is comprehensively carried out by utilizing a method combining copper bar pressing leveling and calibrated rolling force deviation compensation, so that the roll gap level of the rolling mill under normal load production is comprehensively improved; the rolling mill adopts a method of firstly dynamically pressing and adjusting a roll gap under a large rolling force and then statically pressing a copper bar and leveling the roll gap under a small rolling force, thereby eliminating the adverse effect of the gap of rolling mill equipment on the calibration precision of the roll gap in the traditional method and improving the real reflection level of the copper bar pressing on the roll gap; the rolling force deviation value when the upper set of working rolls is pressed against the calibration is fully utilized to provide reference data for the calibration of the next set of working rolls; the real working state of the rolling mill is balanced, and the calibration precision of the roll gap is improved by a method of combining the roll gap preset by the rolling force deviation and the roll gap leveling by the copper bar pressing, and the steel passing stability of the rolling mill under real production is comprehensively improved.
Drawings
FIG. 1 is a schematic view of the static pressing copper bar leveling horizontal roll gap of the present invention.
FIG. 2 is a flow chart of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings.
According to the method for accurately calibrating the rough rolling horizontal roll gap shown in fig. 1 and 2, the method comprises the following steps:
d1 dynamic pressing working roller for the first time to reach the calibrated rolling force FSign boardEliminating equipment clearance
After the new supporting roll or the working roll is replaced, the rolling mill is firstly rotated, and the working roll is manually pressed down to ensure that the horizontal roll gap reaches the calibrated rolling force FSign boardAt the +/-20 t position, the roll is kept to rotate for 60 +/-10 s under the load, and the rolling force deviation of the working roll shows certain regularity and stability during calibration in each supporting roll period, so that the set of working rolls worksThe deviation delta F1 +/-20 t of the roller calibration rolling force is taken as a standard, the horizontal roll gap of the machine roller of the sleeve is firstly pre-adjusted, and the roll gap is lifted at a low speed until the rolling force is not pressed after the pre-adjustment is finished;
d2 second dynamic pressing against working roll to nominal rolling force FSign boardConfirming the working roll rolling force deviation in accordance with the range
After the horizontal roll gap has been preset in D1, the work rolls are again pressed against the nominal rolling force FSign boardChecking whether the rolling force of the working roll is still within the range of delta F1 +/-20 t at the +/-20 t position, if so, lifting the horizontal roll gap at a low speed until the rolling force does not depend on the pressure, and then lifting the roll gap at a high speed until the diameter D of the calibrated copper rod is more than that of the calibrated copper rod, so that the copper rod calibration facility can be smoothly placed in the roll gap, otherwise, adjusting;
d3 static copper bar pressing calibration and leveling horizontal roll gap
The rolling mill is stopped, as shown in fig. 1, two copper bars are placed at a preset position C, D of a lower working roll, one end of the working roll close to C is set as A, one end of the working roll close to D is set as D, the working roll is statically pressed against a horizontal roll gap until the rolling force is 500 +/-50 t, the roll gap is lifted after the rolling force is kept for about 30 +/-5 s, the copper bars are taken out, the thicknesses of the copper bars on two sides are measured by a micrometer, the thickness difference delta h of the two sides is calculated, and thickness deviation value adjustment of AB/CD times is carried out on the roll gap according to the principle of similar;
further, when the absolute value | delta h | of the thickness deviation of the copper rods on the two sides is less than or equal to 0.10mm, the roll gap can be not adjusted; when the absolute value of the deviation | delta h | is more than 0.50mm, the copper bar pressing leveling should be carried out again after the roll gap is correspondingly adjusted, and the leveling accuracy of the rough roll gap is improved by the method of combining the roll gap pre-adjusted by the rolling force deviation and the copper bar pressing leveling roll gap.
D4 dynamic pressing working roll for the third time to the nominal rolling force FSign boardTo eliminate bounce of the working roll
After the copper bar is pressed and the horizontal roll gap is leveled in the step D3, the rolling mill is turned, the working roll is manually pressed down, and the rolling mill is dynamically pressed against the calibrated rolling force FSign boardThe +/-20 t position is used for pressing for eliminating roll bounce, determining the zero position of the roll gap, observing the stable deviation of the rolling force of the working roll, and recording the deviation value delta F2 as the next horizontal roll gapLeveling for data reference;
and D5, clearing the roll gap, lifting the working roll, finishing the calibration process and normally carrying out rolling production.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the protection scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (2)
1. A method for accurately calibrating a rough rolling horizontal roll gap is characterized by comprising the following steps: the method comprises the following steps:
d1 dynamic pressing working roller for the first time to reach the calibrated rolling force FSign boardEliminating equipment clearance; the specific operation is as follows: after the new supporting roll or the working roll is replaced, the rolling mill is firstly rotated, and the working roll is manually pressed down to ensure that the horizontal roll gap reaches the calibrated rolling force FSign boardAt the +/-20 t position, keeping the roll rotating for 60 +/-10 s under load, taking the deviation delta F1 +/-20 t of the calibrated rolling force of the working roll as a standard, firstly pre-adjusting the horizontal roll gap of the machine roll of the sleeve, and after the pre-adjustment is finished, lifting the roll gap at a low speed until the rolling force is not pressed;
d2 second dynamic pressing against working roll to nominal rolling force FSign boardConfirming that the rolling force deviation of the working roll meets the range; the specific operation is as follows: after the horizontal roll gap has been preset in D1, the work rolls are again pressed against the nominal rolling force FSign boardChecking whether the rolling force of the working roll is still within the range of delta F1 +/-20 t at the +/-20 t position, if so, lifting the horizontal roll gap at a low speed until the rolling force does not depend on, and then lifting the roll gap at a high speed until the diameter of the calibrated copper rod is more than that of the calibrated copper rod, so that the copper rod calibration facility can be smoothly placed in the roll gap, otherwise, adjusting;
d3 static copper bar pressing calibration and leveling of a horizontal roll gap; the specific operation is as follows: stopping the rolling mill, placing two copper bars at preset positions of a lower working roll, statically pressing the two copper bars against a horizontal roll gap until the rolling force is 500 +/-50 t, keeping the roll gap for 30 +/-5 s, lifting the roll gap, taking out the copper bars, measuring the thicknesses of the copper bars on two sides by using a micrometer, calculating a difference value delta h of the thicknesses on two sides, and adjusting the deviation value of the roll gap according to a similar triangle principle;
d4 dynamic pressing working roll for the third time to the nominal rolling force FSign boardEliminating the bounce of the working roll; the specific operation is as follows: after the copper bar is pressed and the horizontal roll gap is leveled in the step D3, the rolling mill is turned, the working roll is manually pressed down, and the rolling mill is dynamically pressed against the calibrated rolling force FSign boardDetermining a roll gap zero position at the +/-20 t position, observing that the rolling force deviation of the working roll is stable, recording the deviation value delta F2, and taking data reference for the next horizontal roll gap leveling;
and D5, clearing the roll gap, lifting the working roll, finishing the calibration process and normally carrying out rolling production.
2. The method for accurately calibrating the rough rolling horizontal roll gap according to claim 1, characterized by comprising the following steps: in the step D3, when the absolute value | delta h | of the thickness deviation of the copper rods on the two sides is less than or equal to 0.10mm, the roll gap can be not adjusted; when the absolute value of the deviation | delta h | is more than 0.50mm, the copper bar pressing leveling should be carried out again after the roll gap is correspondingly adjusted, and the leveling accuracy of the rough roll gap is improved by the method of combining the roll gap pre-adjusted by the rolling force deviation and the copper bar pressing leveling roll gap.
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| CN109821905B (en) * | 2019-01-30 | 2021-04-27 | 北京首钢股份有限公司 | Control method and device for preventing burning loss of supporting roll bearing of finishing mill |
| CN110064669B (en) * | 2019-05-08 | 2020-04-28 | 北京科技大学设计研究院有限公司 | Quick zero adjustment method for non-pressure detection instrument |
| CN111872132A (en) * | 2020-06-22 | 2020-11-03 | 邯郸钢铁集团有限责任公司 | Automatic control method for solving camber of rough rolling plate blank |
| CN111842504B (en) * | 2020-07-15 | 2022-06-07 | 上海宝立自动化工程有限公司 | Novel cold continuous rolling mill hot strip soft start thickness control method and system |
| CN111872133B (en) * | 2020-08-03 | 2022-03-15 | 华峰铝业有限公司 | Metal composite material bonding rolling method for improving defects of air bubbles and leather material deviation |
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| US4131004A (en) * | 1977-09-14 | 1978-12-26 | Blaw-Knox Foundry & Mill Machinery, Inc. | Rolling mill gauge and flatness calibration system |
| JPH1177109A (en) * | 1997-07-02 | 1999-03-23 | Hiroyuki Hoshino | Rolling mill |
| CN100518975C (en) * | 2007-08-07 | 2009-07-29 | 攀枝花新钢钒股份有限公司 | Method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill |
| CN102039316B (en) * | 2009-10-10 | 2012-07-11 | 北京理工大学 | Zero-point calibration method for hot continuous rolling machine frame |
| CN102989792B (en) * | 2011-09-16 | 2014-07-09 | 上海梅山钢铁股份有限公司 | Calibration method for clearance between rolls of hot-rolling vertical rolls |
| CN105665454A (en) * | 2016-03-16 | 2016-06-15 | 山东钢铁股份有限公司 | F-type rolling mill calibrating tool for hot continuous rolling production line |
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