CN117947427A - Control method for edge wave shape of hot substrate pickling galvanized product - Google Patents
Control method for edge wave shape of hot substrate pickling galvanized product Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000000758 substrate Substances 0.000 title claims abstract description 16
- 238000005554 pickling Methods 0.000 title claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 73
- 239000010959 steel Substances 0.000 claims description 73
- 238000005096 rolling process Methods 0.000 claims description 16
- 238000004088 simulation Methods 0.000 claims description 8
- 230000002950 deficient Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 abstract description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 25
- 229910052725 zinc Inorganic materials 0.000 description 25
- 239000011701 zinc Substances 0.000 description 25
- 230000007547 defect Effects 0.000 description 14
- 230000008569 process Effects 0.000 description 10
- 239000007788 liquid Substances 0.000 description 8
- 238000004364 calculation method Methods 0.000 description 6
- 238000010924 continuous production Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 230000008719 thickening Effects 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000001816 cooling Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
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- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
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Abstract
The invention discloses a control method for the shape of the edge waves of a hot substrate pickling galvanized product, which belongs to the field of pickling galvanized sheet production and comprises the steps of controlling the shape of a raw material section and carrying out early warning judgment on the high point of the edge of the raw material section. The invention controls the shape of the section of the raw material according to the thickness of the target finished product of the product, sets an early warning value for the height of the high point of the profile, and judges times when the judging value exceeds the early warning value, thereby reducing the production of the galvanized production line by winding the high point at the edge of the section of the raw material.
Description
Technical Field
The invention relates to a steel production method, in particular to a method for controlling the edge wave shape of a galvanized product based on a hot substrate pickling galvanization continuous production line.
Background
The galvanized sheet has good corrosion resistance, and the thicker the zinc layer is, the stronger the corrosion resistance of the galvanized sheet is, and the service life of the steel substrate can be longer through the thick zinc layer. The ultra-thick zinc layer product has higher production difficulty and is easy to generate the situation of side wave shape, and the control method and the control device (CN 201410077506.2) of the side wave shape of the galvanized sheet in the rolling process realize control through the injection valve of the fine cooling equipment of the cold rolling acid rolling mill group production line.
However, with the urgent demand of downstream users for steel cost reduction, the rapid development of hot rolling technology is promoted, the development of thin hot rolled plates is successful, and the realization that a large number of thin hot base plate pickling galvanized products replace the traditional galvanized products after cold rolling by hot replacing cold finished products is realized. Therefore, how to control the edge wave formation of galvanized products based on a hot substrate pickling galvanization continuous production line is an industrial problem.
The production difficulty of the ultra-thick zinc layer product is high, one of the reasons is the problem of edge bulging, and the edge bulging causes edge wave-shaped defects, so that customers cannot use the ultra-thick zinc layer product. The other reason is that the shape of the section of the hot base plate is abnormal, high points or severe wedge-shaped sections exist at the edges, and in the cold rolling and coiling process of the strip steel, the local high points or severe wedge-shaped areas of the edges are overlapped and bulge to cause edge wave-shaped defects, so that galvanized products cannot be used. The edge of the strip steel is thickened due to abnormal technological parameters such as the rib lifting wave shape of the edge of the raw material, the quality of the edge of the raw material, the pressure of the air knife, the distance between the air knife and the strip steel and the like. In the coiling process of the galvanized coil, the edge thickening area is overlapped and raised along with the increase of the coil layers, so that the strip steel in the overlapped area is deformed to generate the wave defect.
Therefore, related researches are carried out by each enterprise, and the control method is mainly focused on two aspects of air knife gap adjustment and baffle distance reduction. The former is as in method for eliminating zinc ripple defect of alloyed hot-dip galvanized steel sheet (CN 202110598871.8), which solves the quality problem of zinc ripple by controlling the temperature of zinc liquid in zinc pot and the temperature of strip steel entering into pot, controlling the mass percent content of aluminum in zinc liquid and the running speed of strip steel, increasing the blowing pressure of air knife, expanding the gap of air knife and improving unit finishing rolling force. The latter is to control the baffle plate at the driving side and the operating side of the zinc pot to be 1-5 mm away from the side of the strip steel, as in the method for producing cold-rolled thick zinc layer hot-dip pure zinc strip and controlling the surface quality (CN 202010938210.0). However, in actual production, most air knives can only perform gap adjustment on line, so that production of multi-specification strip steel cannot be met, and the distance between the baffle plate and the strip steel is shortened, so that the risk of slag adhesion of the baffle plate is increased, and after a certain amount of slag adhesion is accumulated, the air knives are blocked to generate other defects.
Therefore, a control method capable of solving the edge wave defect of the hot substrate pickling galvanized product, which can be used for real industrial continuous production, is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a control method for controlling the shape of the edge waves of a hot substrate pickling galvanized product, which controls the shape of the section of the raw material, controls the rib lifting of the edge and reduces the high point of the edge of the raw material; meanwhile, by optimizing the deviation rectifying function of the galvanization coiling machine, staggered coiling in the strip steel coiling process is realized, and the wave defect caused by superposition of the steel coil in the edge thickening area is relieved.
The technical scheme for solving the technical problems is as follows: a control method for the edge wave shape of a hot substrate pickling galvanized product is characterized by comprising the following steps: the method comprises the steps of controlling the shape of the section of the raw material and the high-point early warning judgment of the edge part of the section of the raw material;
The cross-sectional shape of the raw materials is controlled as follows: setting a convexity C target value according to the thickness h of the finished product of the rolled hot rolled coil, and setting a wedge value W target value to be 0 mu m; the hot continuous rolling finishing mill group controls convexity to a target value under the condition of ensuring flatness of the strip steel at a finish rolling outlet, and the control requirement on the wedge is that the wedge is controlled within the threshold value range under the condition of ensuring convexity;
The high-point early warning judgment of the side part of the raw material section is as follows: measuring thickness variation in the width direction of the strip steel in real time through thickness section detection equipment of a production line, and generating a dynamic profile thickness curve graph of the strip steel section; selecting early warning high points a and b, and calculating Da and Db, wherein the early warning high points comprise: the point a is the highest edge high point higher than the 0 point line and is higher than the middle high point of the convexity of the steel plate, and Da represents the distance from the point a to the L simulation line; the point b is the lowest edge high point lower than the 0 point line, and Db represents the distance from the point b to the L simulation line; setting an a point early warning standard, a b point early warning standard, a convexity early warning standard and a wedge value early warning standard according to the thickness specification; if wedge value early warning occurs or any two of an a point early warning standard, a b point early warning standard and a convexity early warning standard occur, the raw materials judge the defective products and do not enter a galvanization production line for production.
Further, if h is 1.0mm or less, the convexity C target value is 10 μm, and if h is 1.0 to 4.0mm, the convexity C target value is (hx1%) μm.
In the optimization scheme, the method also comprises the step of controlling the section temperature difference of the strip steel to be less than or equal to 30 ℃.
Furthermore, the selection range of the early warning high points is within 40-200 mm from the longitudinal side.
Compared with the prior art, the invention can be used for continuous production in real industry, and solves the problem of edge wave shape of the hot substrate pickling galvanized product.
Drawings
FIG. 1 is a dynamic profile thickness profile of a strip of the present invention.
FIG. 2 is a schematic diagram of a misalignment reeling operation according to the present invention.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
For the purposes of the following detailed description, it is to be understood that the invention may assume various alternative variations and step sequences, except where expressly specified to the contrary. Furthermore, all numbers expressing, for example, quantities of ingredients used in the specification and claims, other than in any operating example or where otherwise indicated, are to be understood as being modified in all instances by the term "about". At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.
Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.
It should also be understood that any numerical range recited herein is intended to include all sub-ranges subsumed therein. For example, a range of "1 to 10" is intended to include all subranges between (and including) the stated minimum value of 1 and the stated maximum value of 10, that is, having a minimum value equal to or greater than 1 and a maximum value equal to or less than 10.
In the present application, the use of the singular includes the plural and plural encompasses singular, unless specifically stated otherwise. In addition, in the present application, unless explicitly stated otherwise, the use of "or" means "and/or", even if "and/or" may be explicitly used in some cases. Further, in the present application, the use of "a" or "an" means "at least one" unless specifically stated otherwise. For example, "a" first material, "a" coating composition, etc., refer to one or more of any of these items.
The invention provides a control method of edge wave shape of a hot substrate pickling galvanized product, which controls the cross-sectional shape of a raw material according to the thickness of a target finished product of the product, sets an early warning value for the height of a high point of a cross-sectional profile, and judges times when the judging value exceeds the early warning value, so as to reduce the winding with the overhigh high point of the edge of the cross-sectional side of the raw material for the production of the galvanized product line.
The specific control comprises the following steps: and controlling the shape of the section of the raw material and carrying out early warning judgment on the high point of the edge of the section of the raw material.
1. Control of raw material cross-section shape
1. Convexity C and wedge value W of hot-rolled strip steel are set
The convexity C of the hot rolled strip, also called the strip transverse thickness difference, refers to the thickness difference of the plate strip in the width direction.
Wherein: h 0 is the thickness of the middle part of the cross section of the strip steel, and the thickness of the strip steel at the two side edges of H 1、H2 is 40 mm.
Wedge value W of hot rolled strip:
W＝H1-H2
According to the thickness h of the finished product of the rolled hot rolled coil, different convexity and wedge values are set:
The hot continuous rolling finishing mill group controls convexity to a target value under the condition of ensuring flatness of the strip steel at a finish rolling outlet, and the control requirement on the wedge shape is that the wedge shape is controlled within the threshold value range under the condition of ensuring convexity.
The main factor influencing the rolling force is temperature, and the change of the temperature can directly lead to the change of the rolling force, thereby influencing the convexity of the strip steel outlet. And roll thermal convexity, roll wear convexity, convexity caused by lateral flow of strip steel are physical processes. The main control means for controlling convexity of hot rolled strip steel is set control, and its principle is that according to rolling data (rolling force, contact arc length, outlet thickness of each stand, etc.) of current strip steel calculated by fine rolling set calculation program (FSU), PDI data (target width, thickness, target convexity, flatness, etc.), roll data (diameter, convexity, roll length, etc.) provided by roll management application program (working roll and supporting roll), thermal convexity of each pass strip steel calculated by thermal convexity calculation module, abrasion convexity data of each pass strip steel provided by roll abrasion calculation module, current PC angle and roll bending force value transmitted from L1, roll system deformation of each stand and convexity of outlet of each stand are calculated by using a series of models, so as to calculate set value of plate shape control mechanism of each stand, and ensure strip steel to reach target convexity and flatness requirements. The specific control method is prior art in the field, and is not developed here again in terms of production line hardware and software.
2. Strip steel section temperature control
The temperature difference of the section is controlled to be less than or equal to 30 ℃.
Since the strip temperature greatly affects the rolling force, and determines the metal flow in the strip width direction. Therefore, the invention limits the control of the temperature of the section of the strip steel, and the temperature difference of the section of the hot rolled strip steel is less than or equal to 30 ℃.
The specific control measures are as follows: the section temperature of the strip steel is measured by a plate surface temperature detector, and the section temperature of the strip steel is controlled by controlling the continuous casting drawing speed and the strip steel edge heater.
2. Raw material section edge high-point early warning judgment
During the ESP process, local high points exist at the contour edge of the section of the strip steel due to the temperature difference of the edge of the strip steel or the abrasion of rollers, and the high points accumulate during the galvanization coiling process to cause the bulge of the edge of the whole strip steel, so that the problem of plate shape is caused.
1. Local high-point classification setting of profile edge
The thickness section detection equipment of the production line measures thickness variation in the width direction of the strip steel in real time, a dynamic curve graph (shown in figure 1) of the profile thickness of the strip steel section is generated, and software automatically generates a 0-point straight line and an L-shaped simulation line. As shown in fig. 1, the upper straight line in the figure is a 0-point straight line (a target thickness curve of the strip steel), the lower straight line is an L-shaped simulation line, and the dynamic line is a section thickness profile of the strip steel.
And selecting an early warning high point, wherein the selection range is within 40-200 mm from the longitudinal side.
The point a is the highest edge high point higher than the 0 point straight line and is higher than the middle high point of the convexity of the steel plate, and Da represents the distance from the point a to the L simulation line.
The point b is the lowest edge high point of the straight line lower than the point 0, and Db represents the distance from the point b to the L simulation line.
2. Setting early warning standard
And setting an a-point early warning standard, a b-point early warning standard, a convexity early warning standard and a wedge value early warning standard according to the thickness specification, wherein the following table is provided:
| thickness interval/mm | Da/μm | Db/μm | Convexity/μm | Wedge value |
| 0.8≤t＜1.2 | ≥1 | ≥16 | ≤6 | Wedge value > convexity value |
| 1.2≤t＜2.0 | ≥5 | ≥21 | ≤9 | Wedge value > convexity value |
| 2.0≤t＜3.0 | ≥7 | ≥26 | ≤11 | Wedge value > convexity value |
3. Judging the times
After the high points of the edges of the raw materials are galvanized in a galvanization production line, the local high points of the edges still exist, after the raw materials are coiled by a coiling machine of the galvanization production line, the edges of the strip steel have the condition that the high points are overlapped, and meanwhile, due to the blowing effect of a galvanization air knife, the overlapping effect is aggravated, so that the wave shape of a galvanization product is aggravated.
Therefore, if wedge value early warning occurs or any two of an a point early warning standard, a b point early warning standard and a convexity early warning standard occur, the raw materials are judged to be defective, and the raw materials do not enter a galvanization production line for production, so that the defect of side waves generated in the galvanization production line is avoided.
By controlling from the raw material level, the incidence rate of edge waviness of galvanized products is reduced from 0.6% to 0.2% based on a hot substrate pickling galvanization continuous production line.
Besides the high points of the edges of the raw materials, the edge of the galvanized product is thickened to form a superposed wave shape, and two main reasons are that the edge effect of the steel strip causes the air flow of the air knife to change at the edge of the steel strip, so that the zinc scraping capability of the air flow is reduced; on the other hand, when the zinc plating is performed, after the air knife scrapes off redundant zinc liquid on the surface of the steel belt, the zinc liquid on the surface of the steel belt is not completely solidified, and the zinc liquid layer is gathered from the edges of other ground directions due to the action of the surface tension of the zinc liquid, so that the edges are thickened and overlapped to generate wave defects. The thicker the zinc layer, the lower the blowing pressure of the air knife, the more serious the zinc scraping capability of the side air flow is reduced, and meanwhile, more zinc liquid is gathered from the middle to the side, and the greater the probability of overlapping wave shapes is caused by the thickening of the side due to two factors.
Therefore, besides the measures, the EPC deviation correcting device of the galvanized coiling machine can be utilized to realize regular staggered coiling, and the edge wave defect caused by the fact that the drum starting position of the galvanized edge is always overlapped and stressed is avoided, so that the edge wave defect of a galvanized product is solved. The EPC deviation correcting device is an existing structure in the current galvanization coiling machine and is used for correcting deviation, and the hardware structure and software of the EPC deviation correcting device are not described here.
The following are specific examples: the thickness of the zinc layer is more than or equal to 300/m 2, and the staggered coiling is carried out.
Step1 generation of a command for a misalignment curl
The calculation formula of the target length L is:
L＝L1+n×d×π
Wherein: l 1 is the distance from the slitting shear to the tangent point of the strip steel and the coiling drum of the coiling machine;
n is the number of turns of the strip steel on the crimping machine;
d, the diameter of the excircle of the winding machine mandrel.
Step2 calculation of the misalignment position
As shown in fig. 2, when the outlet cuts and shears instantly clears the length of the head of the strip steel, the automatic system automatically calculates the position value of the head of the strip steel in the threading process, and when the system detects that the position of the head of the strip steel is greater than the target length L, a staggered edge curling command is generated and sent to the EPC deviation correcting device.
After receiving the command, the EPC automatically stores the current strip steel edge position value as a reference position S 1 of the staggered edge curling position; in the rolling process of the strip steel, EPC detects the edge position of the strip steel in real time, and according to the deviation value delta S between the current position S 2 of the edge of the current strip steel and the reference position S 1, the calculation formula of the deviation value delta S is as follows:
ΔS＝S2－S1
wherein: s 1, taking the reference position;
s 2, the current position.
Step3, transversely moving a coiling machine mandrel to realize the staggered edge curling of the strip steel
And automatically calculating and adjusting the opening degree K of a servo valve of a mandrel hydraulic cylinder of the coiling machine, and realizing the staggered edge curling of the strip steel through the lateral movement of the mandrel.
K＝k1×f(t)×ΔS
Wherein: f (t) is a staggered edge model analytic formula;
k 1 is a conversion coefficient;
Δs is the deviation value.
In the invention, a sine wave model coiling with zero initial phase angle is selected on site, and the calculation formula of the wrong side model analytic formula f (t) is as follows:
wherein: a is amplitude, i.e. depth of staggered layer;
t is the staggered layer period time;
t is the time in the staggered layer process.
In the optimization scheme, the period T is a given period T of the actual torque of the coiling machine. Because the mandrel continuously and repeatedly moves, in order to ensure the stable curling effect, the EPC feeds back the real-time detected mandrel transverse position value to an automation system, and the automation system automatically calculates a coiling machine torque given compensation value delta T according to the detected position value, wherein the formula of the actual coiling machine torque given period T is as follows:
T＝T0+ΔT1+ΔT2+ΔT3
wherein: t 0 is the motor torque value corresponding to the tension of the coiled strip steel;
Delta T 1 is the torque compensation quantity of the motor for overcoming the moment of inertia;
delta T 2 is the torque compensation quantity of the motor for overcoming the friction between the roll surface and the surface of the strip steel;
the delta T 3 motor overcomes the torque compensation quantity of the mandrel position deviation.
In addition to the above measures, the following control can be performed:
1. quality requirements of cold roll system
The rubber rollers of the galvanizing line wear to taper or form obvious steps on the rollers after wear, and when the strip steel contacts the wear roller system, uneven deformation of the strip steel edge can be generated to generate edge wave defects. Therefore, the wear of the roller system of the production line is definitely required, and the wear of the polyurethane rubber roller system of the galvanized production line is less than or equal to 2mm. When the wear level is greater than >2mm, it must be replaced. Monthly line engineers use the maintenance period to schedule wear of the roll system twice.
2. Distance between the air knife baffles at two sides and the strip steel:
The air knife baffle is 2-3mm away from the edge of the strip steel, so that the phenomenon that the baffle sticks slag due to the fact that the distance from the edge of the strip steel is too small (less than 2 mm) can be effectively avoided, and slag is extremely easy to hang on the strip steel after a certain amount of slag is accumulated, so that other defects are caused, meanwhile, the phenomenon that the distance is too far is avoided, and the effect of the baffle is reduced.
The reasons for influencing the thickening of the galvanized edge to cause the edge wave shape, the air knife gap, the blowing angle, the zinc liquid temperature, the aluminum content of the zinc pot and the like belong to the conventional process, and the invention is not stated in the description.
And the high-definition camera can be installed through coiling of a galvanized outlet, the situation that local bulges appear at the edge in the coiling process of the galvanized coil is found through the high-definition camera, the situation is improved, the situation is remained temporarily, the edge wave shape is verified through uncoiling of a recoiling machine set, and quality judgment is carried out according to the wave shape standard.
It is noted that while the present invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various modifications can be made therein without departing from the spirit and scope thereof.
Claims (4)
1. A control method for the edge wave shape of a hot substrate pickling galvanized product is characterized by comprising the following steps: the method comprises the steps of controlling the shape of the section of the raw material and the high-point early warning judgment of the edge part of the section of the raw material;
The cross-sectional shape of the raw materials is controlled as follows: setting a convexity C target value according to the thickness h of the finished product of the rolled hot rolled coil, and setting a wedge value W target value to be 0 mu m; the hot continuous rolling finishing mill group controls convexity to a target value under the condition of ensuring flatness of the strip steel at a finish rolling outlet, and the control requirement on the wedge is that the wedge is controlled within the threshold value range under the condition of ensuring convexity;
The high-point early warning judgment of the side part of the raw material section is as follows: measuring thickness variation in the width direction of the strip steel in real time through thickness section detection equipment of a production line, and generating a dynamic profile thickness curve graph of the strip steel section; selecting early warning high points a and b, and calculating Da and Db, wherein the early warning high points comprise: the point a is the highest edge high point higher than the 0 point line and is higher than the middle high point of the convexity of the steel plate, and Da represents the distance from the point a to the L simulation line; the point b is the lowest edge high point lower than the 0 point line, and Db represents the distance from the point b to the L simulation line; setting an a point early warning standard, a b point early warning standard, a convexity early warning standard and a wedge value early warning standard according to the thickness specification; if wedge value early warning occurs or any two of an a point early warning standard, a b point early warning standard and a convexity early warning standard occur, the raw materials judge the defective products and do not enter a galvanization production line for production.
2. The method for controlling the edge waviness of a hot substrate acid-washed galvanized product according to claim 1, wherein: if h is less than or equal to 1.0mm, the convexity C target value is 10 μm, and if h is between 1.0 and 4.0mm, the convexity C target value is (hx1%) μm.
3. The method for controlling the edge waviness of a hot substrate acid-washed galvanized product according to claim 1, wherein: the method also comprises the step of controlling the temperature difference of the section of the strip steel to be less than or equal to 30 ℃.
4. The method for controlling the edge waviness of a hot substrate acid-washed galvanized product according to claim 1, wherein: the selection range of the early warning high points is within 40-200 mm away from the longitudinal side.
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