CN109201747B - Control method for heating temperature of plate blank - Google Patents
Control method for heating temperature of plate blank Download PDFInfo
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- CN109201747B CN109201747B CN201810861922.XA CN201810861922A CN109201747B CN 109201747 B CN109201747 B CN 109201747B CN 201810861922 A CN201810861922 A CN 201810861922A CN 109201747 B CN109201747 B CN 109201747B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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Abstract
The invention discloses a method for controlling the heating temperature of a plate blank, which belongs to the technical field of steel rolling and comprises the following steps: obtaining a steel loading distance according to a code disc on a plate blank steel loading machine, and controlling a gap between plate blanks of the continuous casting plate blanks in the heating furnace according to the steel loading distance; controlling the pressure in the heating furnace, wherein the pressure range is 20-30 Pa; and controlling the retention time of the continuous casting slab at the furnace end at the furnace outlet side by using the rolling time and the rolling pause time of a single steel block during steel rolling, and determining the distance from the front end surface of the continuous casting slab to the laser detector according to a material tracking system in the heating furnace. The problem that in the prior art, when the temperatures of two sides of a continuous casting slab are inconsistent, the thicknesses of intermediate slabs on the two sides are inconsistent, so that an intermediate slab wedge is generated is solved; or the camber of the intermediate blank caused by inconsistent extension of the two sides in the thermoplastic deformation process, thereby achieving the technical effects of simple method, strong operability and improved temperature uniformity in the width direction of the plate blank.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a method for controlling the heating temperature of a plate blank.
Background
The production process flow of the traditional hot continuous rolling production line is as follows: heating a continuous casting plate blank → rough rolling of a rough rolling unit → finish rolling of a finishing rolling unit → laminar cooling to a target coiling temperature → coiling of a coiling unit. Firstly, a continuous casting plate blank is heated in a heating furnace, then thermoplastic deformation rolling of rough rolling and finish rolling is carried out, and the uniformity of the heating temperature of the plate blank directly influences the smoothness and stability of subsequent rolling. The slab temperature uniformity comprises slab length direction temperature uniformity and slab width direction temperature uniformity, wherein the length direction temperature uniformity is researched more, but a control method of the temperature uniformity along the slab cross section direction is not involved. The temperature uniformity in the plate width direction is directly related to the wedge shape and the camber of the intermediate plate blank after rough rolling and the wedge shape and the camber of the hot rolled plate strip at the outlet of the finishing mill group, and the guarantee of the rolling stability and the plate shape quality of the product are seriously influenced.
However, in the process of implementing the technical solution of the invention in the embodiments of the present application, the inventors of the present application find that the above-mentioned technology has at least the following technical problems:
when the temperatures of two sides of the continuous casting slab in the width direction are inconsistent, on one hand, the thickness of the middle slabs at two sides is inconsistent to generate middle slab wedges due to the inconsistent rolling forces at two sides of a rough rolling unit in the rough rolling process; on the other hand, the camber of the intermediate slab occurs due to inconsistent extension of the two sides in the thermoplastic deformation process, the two problems increase the risk for the engagement of the finishing mill set, when the finishing mill set continues rolling, the defects of wedge shape and camber of the intermediate slab can be further enlarged, the wedge shape and camber of the hot rolled plate strip steel are slightly caused, the rolling waste of the finishing mill set is seriously caused, and the serious influence is brought to the production yield and the product quality, so the heating quality in the width direction of the continuous casting slab is very important.
Disclosure of Invention
The invention provides a method for controlling the heating temperature of a slab, which is used for solving the problem that in the prior art, when the temperatures of two sides of a continuous casting slab in the width direction are inconsistent, the thicknesses of intermediate slabs on the two sides are inconsistent, so that an intermediate slab wedge is generated; or the camber of the intermediate blank caused by inconsistent extension of the two sides in the thermoplastic deformation process, thereby achieving the technical effects of simple method, strong operability and improved temperature uniformity in the width direction of the plate blank.
The invention provides a method for controlling the heating temperature of a plate blank, which comprises the following steps: obtaining a steel loading distance according to a code disc on a plate blank steel loading machine, and controlling a gap between plate blanks of the continuous casting plate blanks in the heating furnace according to the steel loading distance; controlling the pressure in the heating furnace, wherein the pressure range is 20-30 Pa; and controlling the retention time of the continuous casting slab at the furnace end at the furnace outlet side by using the rolling time and the rolling pause time of a single steel block during steel rolling, and determining the distance from the front end surface of the continuous casting slab to the laser detector according to a material tracking system in the heating furnace.
Preferably, the distance from the front end face of the continuous casting slab to the laser detector is less than or equal to 1200 mm; the retention time is less than or equal to 3 min.
Preferably, the gap between the slabs is 50 mm-200 mm.
Preferably, the controlling of the pressure inside the heating furnace includes: and controlling the pressure in the heating furnace through opening and closing of a flue shutter in the heating furnace, wherein the pressure of the heating furnace has a set value.
Preferably, the controlling of the pressure in the heating furnace by opening and closing of a flue damper in the furnace includes: when the measured pressure value in the heating furnace is lower than the set value, the opening degree of a flue gate plate is reduced; and when the measured pressure value in the heating furnace is higher than the set value, the opening degree of the flue gate plate is increased.
One or more technical solutions in the embodiments of the present invention at least have one or more of the following technical effects:
the embodiment of the invention provides a method for controlling the heating temperature of a plate blank, which comprises the following steps: obtaining a steel loading distance according to a code wheel on a slab steel loading machine, and controlling a gap between slabs of the continuous casting slabs in the heating furnace according to the steel loading distance so as to meet the requirement of sufficient heat absorption of the edge of the continuous casting slabs and enable the temperature of the slabs to reach a tapping temperature target value when the temperature of the slabs reaches the tapping side of the heating furnace; controlling the pressure in the heating furnace, wherein the pressure range is 20-30Pa, so that the problem of influence of the external environment on the temperatures of two sides of the steel tapping side of the heating plate blank can be avoided, and the technical effect of fully absorbing heat at the edge of the continuous casting plate blank is further achieved; the method comprises the steps of controlling the furnace end staying time of a continuous casting plate blank on the tapping side by utilizing the rolling time and the rolling intermittence time of a single steel during steel rolling, determining the distance from the front end surface of the continuous casting plate blank to a laser detector according to a material tracking system in a heating furnace, and further achieving the technical effect of avoiding the influence of the external environment on the temperatures of two sides of the heating plate blank on the tapping side, so that the problem that the intermediate blank wedge is generated due to the fact that the thicknesses of the intermediate plate blanks on the two sides are inconsistent when the temperatures of the two sides of the continuous casting plate blank are inconsistent in the prior; or the camber of the intermediate blank caused by inconsistent extension of the two sides in the thermoplastic deformation process, thereby achieving the technical effects of simple method, strong operability and improved temperature uniformity in the width direction of the plate blank.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Fig. 1 is a schematic flow chart of a method for controlling a heating temperature of a slab according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method for controlling the heating temperature of a slab, which is used for solving the problem that in the prior art, when the temperatures of two sides of a continuous casting slab are inconsistent, the thicknesses of intermediate slabs on the two sides are inconsistent, so that an intermediate slab wedge is generated; or the camber of the intermediate blank caused by inconsistent extension of the two sides in the thermoplastic deformation process, thereby achieving the technical effects of simple method, strong operability and improved temperature uniformity in the width direction of the plate blank.
The technical scheme in the embodiment of the invention has the following general idea:
the embodiment of the invention provides a method for controlling the heating temperature of a plate blank, which comprises the following steps: obtaining a steel loading distance according to a code disc on a plate blank steel loading machine, and controlling a gap between plate blanks of the continuous casting plate blanks in the heating furnace according to the steel loading distance; controlling the pressure in the heating furnace, wherein the pressure range is 20-30 Pa; and controlling the retention time of the continuous casting slab at the furnace end at the furnace outlet side by using the rolling time and the rolling pause time of a single steel block during steel rolling, and determining the distance from the front end surface of the continuous casting slab to the laser detector according to a material tracking system in the heating furnace. The problem that in the prior art, when the temperatures of two sides of a continuous casting slab are inconsistent, the thicknesses of intermediate slabs on the two sides are inconsistent, so that an intermediate slab wedge is generated is solved; or the camber of the intermediate blank caused by inconsistent extension of the two sides in the thermoplastic deformation process, thereby achieving the technical effects of simple method, strong operability and improved temperature uniformity in the width direction of the plate blank.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Fig. 1 is a schematic flow chart of a method for controlling a heating temperature of a slab according to an embodiment of the present invention. As shown in fig. 1, the method includes:
step 110: obtaining a steel loading distance according to a code disc on a plate blank steel loading machine, and controlling a gap between plate blanks of the continuous casting plate blanks in the heating furnace according to the steel loading distance;
further, the range of the gap between the slabs is 50-200 mm.
Specifically, steel loading stroke detection is carried out through a code wheel on a steel loading machine for the plate blank, so that the control of the gap between the steel loading plate blank and the plate blank is realized, and the gap between the plate blank and the plate blank of the continuous casting plate blank in the heating furnace is controlled to be more than or equal to 50mm and less than or equal to 200 mm. The heating furnace of the hot continuous rolling production line is generally divided into a stepping heating furnace and a steel pushing heating furnace, when a continuous casting slab enters the heating furnace, the range of a gap between the slab and the slab is controlled to be between 50mm and 200mm, so that the requirement of full heat absorption of the edge of the continuous casting slab can be met, different steel types are heated according to a given heating system, and the temperature of the slab reaches a target tapping temperature when the temperature of the slab reaches the tapping side of the heating furnace.
Step 120: controlling the pressure in the heating furnace, wherein the pressure range is 20-30 Pa;
further, the pressure in the heating furnace is controlled by opening and closing a flue shutter in the heating furnace, and the pressure of the heating furnace has a set value.
Further, when the measured pressure value in the heating furnace is lower than the set value, the opening degree of the flue gate plate is reduced; and when the measured pressure value in the heating furnace is higher than the set value, the opening degree of the flue gate plate is increased.
Specifically, the pressure in the heating furnace is controlled within the range of 20-30 Pa. The control of the pressure in the heating furnace is controlled by the opening and closing degree of a flue shutter in the furnace, an automatic system compares the detected actual pressure measurement value in the furnace with a set pressure value, and when the pressure in the furnace is lower than the set value, the opening degree of the flue shutter is closed to be small; when the pressure in the furnace is higher than a set value, the opening degree of the flue gate plate is increased, and the adjustment amplitude of the gate plate is automatically controlled by an automatic system. When the furnace door of the tapping side of the heating furnace is opened, if the pressure in the furnace is improperly controlled, the furnace end of the heating furnace can suck cold air, and the temperature of the two sides of the heating plate blank is influenced. When the pressure in the furnace is controlled to be 20-30Pa, the problem that the external environment influences the temperatures of the two sides of the heating plate blank at the steel tapping side can be avoided, and the technical effect of fully absorbing heat at the edge of the continuous casting plate blank is further achieved.
Step 130: controlling the retention time of a furnace end of a continuous casting plate blank on a furnace outlet side by using the rolling time and the rolling pause time of a single piece of steel during steel rolling, and determining the distance from the front end surface of the continuous casting plate blank to a laser detector according to a material tracking system in a heating furnace;
further, the controlling of the residence time of the continuous casting slab at the furnace end of the tapping side and the determining of the distance of the front end of the continuous casting slab from the laser detector further comprise: the distance between the front end surface of the continuous casting slab and the laser detector is less than or equal to 1200 mm; the retention time is less than or equal to 3 min.
Specifically, the residence time of the continuous casting slab at the tapping side is controlled by the rolling time and the rolling pause time of a single piece of steel during steel rolling, the distance of the slab in the furnace passes through a material tracking system in the heating furnace, and the distance from the slab to a laser detector of a furnace end of the heating furnace is determined, wherein when the distance from the front end surface of the slab to the laser detector is smaller than or equal to 1200mm, the residence time of the furnace end of the slab at the tapping side is smaller than or equal to 3 min. The traditional hot continuous rolling production line is generally matched with 2-4 heating furnaces, each heating furnace alternately taps steel, and the starting running time of the plate blank at the furnace end of each heating furnace is determined according to the actual rolling rhythm of the hot continuous rolling production line and the unit stepping time of different types of heating furnaces, so that the staying time of the front end face of the plate blank within 1200mm from the laser detection distance is not more than 3 min. The technical effect of avoiding the influence of the external environment on the temperatures of the two sides of the heating plate blank at the steel tapping side is further achieved.
Example two
The following describes in detail a method for controlling a slab heating temperature in an embodiment of the present invention, specifically as follows:
taking the uniformity control of the heating temperature at two sides of the S18G steel plate blank as an example, the method specifically comprises the following steps: the 1580 hot continuous rolling production line and the 3 stepping heating furnaces heat the continuous casting slabs of the steel grade S18G to produce 2000 tons, and the specific control measures are as follows: the width of the continuous casting slab is 1250mm, the gap between the slab and the heating furnace is 100mm, the heating is carried out according to a given heating system, and the pressure in the furnace is controlled according to the target 25Pa in the heating process. And (3) alternately tapping by using the heating furnaces, wherein the rolling rhythm of the 1580 hot continuous rolling production line is 3 min/block, after the tapping of the No. 1 furnace, the furnace end plate blank stays at the original position, the front section of the plate blank is 300mm away from the laser detector, and the unit stepping distance of the heating furnace is 600 mm. When the No. 2 furnace performs tapping action, the No. 1 furnace blank stays at the original position, after the No. 3 furnace taps steel, the No. 2 furnace performs tapping action, and the three heating furnaces perform alternately. The continuous casting slab stays at the furnace end position of the tapping side of the heating furnace for 1 min.
The final result shows that the temperature difference of two sides of the discharged plate blank of the S18G steel grade is 3 ℃, the temperature difference of two sides of the intermediate plate blank is 8 ℃ after the rough rolling is finished, the temperature difference of the middle part and the edge part of the intermediate plate blank is 26 ℃, the rolling process is smooth and stable, the problem of difficult biting of a finishing mill set caused by camber does not occur, and the wedge hit rate of a hot rolled coil product reaches more than 97.13%.
EXAMPLE III
Another method for controlling the heating temperature of the slab in the embodiment of the present invention is described in detail below, specifically as follows:
taking the uniformity control of the heating temperature at two sides of the S40 steel plate blank as an example, the method specifically comprises the following steps: 1580 hot continuous rolling production line, 3 walking beam furnaces, on steel grade S40, adopting the control method in the above patent to heat the continuous casting slab, producing 10000 tons, the concrete control measures are as follows: the width of the continuous casting slab is 1300mm, the gap between the slabs in the heating furnace is 50mm, the heating is carried out according to a given heating system, and the pressure in the furnace is controlled according to a target 23Pa in the heating process. And (3) alternately tapping by using the heating furnaces, wherein the rolling rhythm of the 1580 hot continuous rolling production line is 3 min/block, after the tapping of the No. 1 furnace, the furnace end plate blank stays at the original position, the front section of the plate blank is 300mm away from the laser detector, and the unit stepping distance of the heating furnace is 600 mm. When the No. 2 furnace performs tapping action, the No. 1 furnace blank stays at the original position, after the No. 3 furnace taps steel, the No. 2 furnace performs tapping action, and the three heating furnaces perform alternately. The continuous casting slab stays at the furnace end position of the tapping side of the heating furnace for 1 min.
Test results show that the temperature difference between the two sides of the discharged plate blank of the S40 steel grade is 4 ℃, the temperature difference between the two sides of the intermediate plate blank is 10 ℃ after rough rolling is finished, the temperature difference between the middle part and the edge part of the intermediate plate blank is 28 ℃, the rolling process is smooth and stable, the problem of difficult biting of a finishing mill set caused by camber does not occur, and the wedge hit rate of a hot-rolled coil product reaches more than 98.04%.
Therefore, in the embodiment of the invention, the temperature uniformity of the width direction of the plate blank can be improved under the heating system of the existing heating furnace equipment by the method, the temperature difference of two sides of the plate blank after the furnace is discharged is controlled within 5 ℃, the temperature difference of two sides of the intermediate blank after the rough rolling is finished is controlled within 10 ℃, and the temperature difference of the middle part and the edge part is controlled within 30 ℃.
One or more technical solutions in the embodiments of the present invention at least have one or more of the following technical effects:
the embodiment of the invention provides a method for controlling the heating temperature of a plate blank, which comprises the following steps: obtaining a steel loading distance according to a code wheel on a slab steel loading machine, and controlling a gap between slabs of the continuous casting slabs in the heating furnace according to the steel loading distance so as to meet the requirement of sufficient heat absorption of the edge of the continuous casting slabs and enable the temperature of the slabs to reach a tapping temperature target value when the temperature of the slabs reaches the tapping side of the heating furnace; controlling the pressure in the heating furnace, wherein the pressure range is 20-30Pa, so that the problem of influence of the external environment on the temperatures of two sides of the steel tapping side of the heating plate blank can be avoided, and the technical effect of fully absorbing heat at the edge of the continuous casting plate blank is further achieved; the method comprises the steps of controlling the furnace end staying time of a continuous casting plate blank on the tapping side by utilizing the rolling time and the rolling intermittence time of a single steel during steel rolling, determining the distance from the front end surface of the continuous casting plate blank to a laser detector according to a material tracking system in a heating furnace, and further achieving the technical effect of avoiding the influence of the external environment on the temperatures of two sides of the heating plate blank on the tapping side, so that the problem that the intermediate blank wedge is generated due to the fact that the thicknesses of the intermediate plate blanks on the two sides are inconsistent when the temperatures of the two sides of the continuous casting plate blank are inconsistent in the prior; or the camber of the intermediate blank caused by inconsistent extension of the two sides in the thermoplastic deformation process, thereby achieving the technical effects of simple method, strong operability and improved temperature uniformity in the width direction of the plate blank.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (5)
1. A method for controlling the heating temperature of a sheet blank, the method comprising:
obtaining a steel loading distance according to a code disc on a plate blank steel loading machine, and controlling a gap between plate blanks of the continuous casting plate blanks in the heating furnace according to the steel loading distance;
controlling the pressure in the heating furnace, wherein the pressure range is 20-30 Pa;
and controlling the retention time of the continuous casting slab at the furnace end at the furnace outlet side by using the rolling time and the rolling pause time of a single steel block during steel rolling, and determining the distance from the front end surface of the continuous casting slab to the laser detector according to a material tracking system in the heating furnace.
2. The method according to claim 1, wherein the front end face of the continuous casting slab is located at a distance of 1200mm or less from the laser detector;
the retention time is less than or equal to 3 min.
3. The method according to claim 1, characterized in that the gap between the slabs is in the range 50mm to 200 mm.
4. The method of claim 1, wherein said controlling the pressure within said furnace comprises:
and controlling the pressure in the heating furnace through opening and closing of a flue shutter in the heating furnace, wherein the pressure of the heating furnace has a set value.
5. The method of claim 4, wherein said controlling pressure within said furnace by opening and closing a flue damper within said furnace comprises:
when the measured pressure value in the heating furnace is lower than the set value, the opening degree of a flue gate plate is reduced;
and when the measured pressure value in the heating furnace is higher than the set value, the opening degree of the flue gate plate is increased.
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| CN201810861922.XA CN109201747B (en) | 2018-08-01 | 2018-08-01 | Control method for heating temperature of plate blank |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5291763A (en) * | 1976-01-29 | 1977-08-02 | Tokyo Shibaura Electric Co | Device for controlling winding temperature of hot strip mill |
| JPS5814486B2 (en) * | 1976-10-20 | 1983-03-19 | 住友金属工業株式会社 | How to control a heating furnace |
| CN1824401A (en) * | 2005-02-26 | 2006-08-30 | 攀枝花新钢钒股份有限公司 | Control method of continuous blank heating temperature |
| CN101429592B (en) * | 2008-12-01 | 2011-05-11 | 重庆大学 | Fuzzy control method for temperature distribution of inner steel bloom of heating stove |
| CN104307911B (en) * | 2014-08-28 | 2016-03-02 | 首钢总公司 | Improve the method for high surface grade IF steel percentage elongation |
| CN207479193U (en) * | 2017-11-03 | 2018-06-12 | 南京净环热冶金工程有限公司 | A kind of constructional device of continuous casting blank temperature the Uniform Control |
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