CN110479775B - Process control method for shortening temperature difference of water-cooling section of high-speed wire - Google Patents
Process control method for shortening temperature difference of water-cooling section of high-speed wire Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 55
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
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- 238000009987 spinning Methods 0.000 abstract description 13
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- 229910000677 High-carbon steel Inorganic materials 0.000 description 5
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Abstract
The invention relates to a process control method for shortening the temperature difference of a water cooling section of a high-speed wire, which preferentially uses a front-pass water tank of a finishing mill group, a reducing mill group and a laying head, and when the water quantity of the front-pass water tank of the finishing mill group exceeds 150m3H, the water quantity of the rear water tank of the finishing mill group exceeds 120m3When the water flow is in the second pass, the water tanks in the last pass are used in sequence, and the water quantity of the idle water tank is controlled to be 5m3Within the volume of/h, in the normal production process, a group of positive blowing air, two groups of back blowing air and two groups of back blowing water of the water penetrating guide groove in the water tank are opened, on one hand, the water cooling in the water tank is sealed, the cooling effect is improved, on the other hand, the water stain on the surface of the part of the red steel after the water tank is discharged is removed, and the temperature difference of the cross section is reduced, so that the maximum value of the temperature difference of the cross section of the red steel surface is controlled within 25 ℃, and the temperature uniformity of the red steel entering the next rolling process or the spinning process.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a process control method for shortening the temperature difference of a water cooling section of a high-speed wire rod, which is used for controlling the water cooling uniformity of a poker during the rolling process of the high-speed wire rod.
Background
The core technology of high-speed wire production is controlled rolling and cooling, and the controlled cooling of the high-speed wire is formed by water cooling and air cooling after rolling. The water cooling control directly influences the production smooth running, the equipment stability and the key temperature control of the high-speed rolling area. Production accidents such as medium-high carbon steel blackheads, free-cutting steel split heads and the like are easily caused by improper water cooling control, quality accidents such as structural change of cord steel oxidation layers and low alloy steel martensite are caused, and in addition, head scratches of large-size low carbon steel in the sliding guide groove are induced.
At present, the equipment configuration of a high-speed area of a high-speed wire mill is mainly divided into a finishing mill group, a finishing mill group + 4-frame reducing sizing mill group, a finishing mill group + 2-frame reducing sizing mill group and the like, and a plurality of water tanks are arranged at the front and rear positions of the equipment and used for cold control before spinning. In the process of controlled cooling, in order to reduce production accidents, the red steel head is generally provided with high-temperature sections with different degrees, and the high-temperature section of the head is higher than the middle normal temperature by about 50-100 ℃. In order to ensure the product quality, shearing materials are required to be added subsequently, so that the production cost is increased.
Because the subsequent process of the single finishing mill group does not relate to the rolling process, the head of the red steel does not carry out rolling deformation any more, and the subsequent water cooling process is relatively simple to control. The water cooling control of the finishing mill group and the 4-frame reducing sizing mill group is relatively simpler than that of the finishing mill group and the 2-frame reducing sizing mill group because the finishing mill group and the 4-frame reducing sizing mill group are generally used for producing products with the specification of phi 16.0mm, and the finishing mill group and the 2-frame reducing sizing mill group are generally used for producing products with the specification of phi 5.5-16.0 mm. When a product with the specification of phi 5.5-6.5mm is produced, the finish rolling speed of 2 reducing units reaches more than 100m/s, and the difficulties of water penetration and steel piling, long head high-temperature section and the like in the production process of red steel are overcome. Therefore, the water cooling control problem of the finishing mill group and the 2-frame reducing mill group is solved, namely the water cooling control problem of equipment configuration of other high-speed areas of the high-speed wire mill at present can be basically solved.
For high-carbon steel with the initial rolling temperature higher than 1040 ℃ or low-alloy steel with the initial rolling temperature lower than 940 ℃, due to the influence of factors such as overhigh final rolling speed, large cooling amplitude, high rolling temperature rise and the like, the red steel is cooled by water passing through a water tank and then has a strip blackening phenomenon in the rolling direction in a rolling high-speed area, namely, the same section has obvious sun and shade surfaces. The maximum temperature difference of the surface section reaches 70-100 ℃ by temperature measurement. Such problems increase the risk of production quality accidents on the one hand and increase the uncertainty of damage to the main equipment and process pieces on the other hand. Through the analysis of the site production data of a certain plant, the failure rate of the steel grade is far greater than that of other steel grades, and the problem is attributed to the non-uniformity of water cooling control.
At present, no control technology is disclosed about high-speed wire water cooling uniformity, and at the same time, more than one hundred control modes are combined for each water tank. At present, an effective water cooling control method is urgently needed for improving the stability of the production process of medium and high-end wire rod products.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, the invention provides a process control method for shortening the temperature difference of a water cooling section of a high-speed wire, which achieves the process control of optimizing the water cooling process by controlling the use mode and parameter setting of each water tank and monitoring of an online pyrometer.
The technical scheme adopted by the invention for solving the technical problems is as follows: a process control method for shortening the temperature difference of a water cooling section of a high-speed wire comprises the following steps:
a. collecting electric signals by online pyrometers arranged in front of and behind the finishing mill group, the reducing mill group and the laying head to feed back temperature signals in real time, calculating the length of a high-temperature segment with the head temperature of the red steel and the middle stable temperature different by 25 ℃ according to the relation data of the temperature and the time stored in the PDA, judging the control level of the temperature difference of the red steel poker bars in each section in front of the finishing mill group, the reducing mill group and the laying head according to the temperature fluctuation condition in the PDA, and judging the control level of the temperature difference of the same section of the red steel by measuring the temperature by a handheld temperature measuring gun;
b. during normal operation, a three-way valve connected with a first water tank in front of a finishing mill set is opened, a three-way valve connected with a second water tank is closed, a three-way valve connected with a third water tank in front of a reducing mill set is opened, a three-way valve connected with a fourth water tank and a fifth water tank is closed, a three-way valve connected with a sixth water tank in front of a laying head is opened, a three-way valve connected with a seventh water tank is closed, a group of positive blowing air, two groups of back blowing air and two groups of back blowing water in the water penetrating guide grooves in the first water tank, the third water tank and the sixth water tank are synchronously opened, and a secondary valve in the middle of three secondary valves connected with the water penetrating guide grooves;
c. when the water quantity of the first water tank in front of the finishing mill group exceeds 150m3H, the water quantity of a third water tank behind the finishing mill group exceeds 120m3When the water tank is in the second water tank, the second water tank is opened before the finishing mill group, the fourth water tank and the fifth water tank are opened before the reducing mill group, and the seventh water tank is opened before the laying head;
d. the water pressure of each water tank in use is controlled within the range of 0.1-1.0 MPa.
Preferably, the three-way valve adopts a flow control mode, so that the initial water flow is greater than the intermediate process water flow, and the temperature of the three-way valve is high relative to the head temperature of the red steel and low relative to the intermediate temperature to form cooling complementation so as to achieve the effect of reducing the temperature difference of the section of the poker.
Further, at the moment of starting the three-way valve, the water pressure of the used water tank is larger than 0.2MPa, and when the pressure does not reach the control range, the opening degree of an overflow valve connected with the three-way valve is reduced by 1%.
The invention has the beneficial effects that: the invention preferentially uses the water tank of the previous pass to increase the time of the temperature return section of the red steel after forced cooling, and in addition, the water seals at the inlet and the outlet of the water tank and the air seals are utilized to remove the water film on the surface of the red steel, so that the maximum temperature difference of the surface section of the red steel is controlled within 25 ℃, and the temperature uniformity of the red steel entering the next rolling procedure or spinning procedure is ensured. The effect of using the water tank pressure boost is realized through changing water tank use quantity and overflow valve aperture control, and when water pressure increased, the red steel improved the cooling homogeneity of same cross-section because of the buoyancy increase in wearing water guide slot. In addition, a partial water tank centralized cooling mode is used for replacing all water tank distributed cooling modes in the water cooling process, and the non-overlapping transition length of the high-temperature sections of the red steel heads in the cooling control process of each water tank is reduced by reducing the using number of the water tanks. Furthermore, the water tank three-way valve adopts the flow control mode for the initial water flow is greater than middle process water flow, and this and red steel head temperature are high and middle temperature is low to form the cooling complementary, thereby reach the effect that reduces the poker cross-section difference in temperature.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic diagram of the layout structure of the high-speed wire rod rolling equipment.
Fig. 2 is a schematic diagram of the tank channel layout and tank water system control of fig. 1.
In the figure: 1. the system comprises a finishing mill unit, a reducing mill unit 2, a wire laying machine 3, a pinch roll 4, a first water tank 6, a second water tank 7, a third water tank 8, a fourth water tank 9, a fifth water tank 10, a sixth water tank 11, a seventh water tank 12, a flying shear 13, a water through guide groove 13, a positive blowing air source 14, a back blowing air source 15, a back blowing water source 16, a secondary valve 17, a three-way valve 18 and an overflow valve 19.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1 and 2, a high-speed wire rod rolling device comprises a finishing mill group 1, a reducing mill group 2 and a wire laying machine 3 which are sequentially arranged along a high-speed wire rod rolling direction, wherein a pair of pinch rolls 4 is arranged in front of the wire laying machine 3, a first water tank 5 and a second water tank 6 are arranged in front of the finishing mill group 1, a third water tank 7, a fourth water tank 8 and a fifth water tank 9 are arranged between the finishing mill group 1 and the reducing mill group 2, a sixth water tank 10 and a seventh water tank 11 are arranged between the reducing mill group 2 and the wire laying machine 3, and a flying shear 12 is further arranged in front of the finishing mill group 1. The arrows in fig. 1 and 2 indicate the rolling direction.
A plurality of water penetrating guide grooves 13 are arranged in each water tank along the rolling direction, the water penetrating guide grooves 13 at the end parts of the water tanks are connected with positive blowing air 14, the water penetrating guide grooves 13 at the tail ends of the water tanks are respectively connected with two groups of back blowing air 15 and two groups of back blowing water 16, the two groups of back blowing air 15 and the two groups of back blowing water 16 are arranged in a staggered mode, and the three water penetrating guide grooves 13 in the middle are respectively connected with a secondary valve 17 and a three-way valve 18 and an overflow valve 19.
A process control method for shortening the temperature difference of a water cooling section of a high-speed wire comprises the following steps:
a. collecting electric signals by online pyrometers arranged in front of and behind the finishing mill group 1, the reducing mill group 2 and the laying head 3 to feed back temperature signals in real time, calculating the length of a high-temperature section with the difference of the head temperature of the red steel and the middle stable temperature of 25 ℃ according to the relation data of the temperature and the time stored in the PDA, judging the control level of the temperature difference of the red steel poker bars in each section in front of the finishing mill group 1, the reducing mill group 2 and the laying head 3 according to the temperature fluctuation condition in the PDA, and judging the control level of the temperature difference of the same section of the red steel by measuring the temperature by a handheld temperature measuring gun;
b. during normal operation, a three-way valve 18 connected with a first water tank 5 in front of a finishing mill unit 1 is opened, the three-way valve 18 connected with a second water tank 6 is closed, a three-way valve 18 connected with a third water tank 7 in front of a reducing mill unit 2 is opened, the three-way valve 18 connected with a fourth water tank 8 and a fifth water tank 9 is closed, the three-way valve 18 connected with a sixth water tank 10 in front of a laying head 3 is opened, the three-way valve 18 connected with a seventh water tank 11 is closed, a group of positive blowing air 14, two groups of back blowing air 15 and two groups of back blowing water 16 in the water through guide grooves 13 in the first water tank 5, the third water tank 7 and the sixth water tank 10 are synchronously opened, and a secondary valve 17 in the middle of three secondary valves 17 connected with the water through guide grooves 13 in the first water;
c. when the water amount in the first water tank 5 exceeds 150m before the finishing mill group 13The water quantity of the third water tank 7 behind the finishing mill group 1 exceeds 120m3When the water tank is used for the first time, the water tanks of the last pass are used in sequence, namely the second water tank 6 is opened before the finishing mill group 1, the fourth water tank 8 and the fifth water tank 9 are opened before the reducing mill group 2, and the seventh water tank 11 is opened before the laying head 3;
d. the water pressure of each water tank in use is controlled within the range of 0.1-1.0 MPa, wherein the water quantity of each water tank in an idle state is controlled within 5m3Within/h.
Preferably, the three-way valve 18 adopts a flow control mode, so that the initial water flow is larger than the intermediate process water flow, and the cooling complementation is formed by the high temperature of the red steel head and the low intermediate temperature, thereby achieving the effect of reducing the temperature difference of the section of the poker.
Further, at the moment when the three-way valve 18 is started, the water pressure of the used water tank is greater than 0.2MPa, and when the pressure does not reach the control range, the opening degree of a relief valve 19 connected with the three-way valve 18 is reduced by 1%.
Example 1: a process control method for shortening the temperature difference of a water-cooling section of a high-carbon steel wire rod with the diameter of phi 5.5 mm.
160mm2The high-carbon steel of the square billet is rolled into a phi 5.5mm wire rod by a two-frame reducing unit 2 at a finish rolling speed of 100m/s, the start rolling temperature is 1040 +/-30 ℃, the temperature before finish rolling is 900 +/-20 ℃, the temperature before the reducing unit 2 is 900 +/-20 ℃, the spinning temperature is 930 +/-15 ℃, and the specific water cooling process control method is as follows:
(1) referring to fig. 1 and 2, before the finishing mill group 1, the three-way valve 18 of the first water tank 5 is opened, the three-way valve 18 of the second water tank 6 is closed, the forward blowing air 14, the back blowing air 15 and the back blowing water 16 of the water passing guide groove 13 of the first water tank 5 are opened, the second secondary valve 17 of the three secondary valves 17 connected with the first water tank 5 is closed, and the water amount is set to be 50-70 m3The water pressure is set to be more than 0.1MPa, the temperature difference of the red steel in the same direction before finish rolling is controlled within 25 ℃, and the temperature difference of the cross section is controlled within 20 ℃;
(2) before the reducing unit 2, the three-way valve 18 of the third water tank 7 is opened, and the three-way valves of the fourth water tank 8 and the fifth water tank 9 are closedA valve 18; the third water tank 7 opens the positive blowing air 14, the back blowing air 15 and the back blowing water 16 of the water through guide groove 13, closes the second secondary valve 17 of the three secondary valves 17 connected with the third water tank 7, and sets the water amount to be 70-90 m3The water pressure is set to be more than 0.1MPa, the opening of the overflow valve 19 is less than 35%, the temperature difference of the red steel in the front of the reducing unit 2 except the high-temperature section in the same direction is controlled within 20 ℃, and the temperature difference of the cross section is controlled within 20 ℃;
(3) the three-way valve 18 of the sixth water tank 10 is opened before the laying head 3, the three-way valve 18 of the seventh water tank 11 is closed, the forward blowing air 14, the back blowing air 15 and the back blowing water 16 of the water penetrating guide groove 13 of the sixth water tank 10 are opened, the second secondary valve 17 of the three secondary valves 17 connected with the sixth water tank 10 is closed, and the water amount is set to be 40-60 m3The water pressure is set to be more than 0.1MPa, the opening degree of the overflow valve 19 is less than 30%, the temperature difference of the same-direction poker bars of the red steel before spinning except the high-temperature section is controlled within 20 ℃, the temperature difference of the cross section is controlled within 15 ℃, and the high-temperature section of the spinning head is controlled within 20 circles.
Example 2: a process control method for shortening the temperature difference of a water-cooling section of a low alloy steel wire rod with the diameter of 8.0 mm.
160mm2The low alloy steel of the square billet is rolled into a phi 8.0mm wire rod by a two-frame reducing unit 2 at a finish rolling speed of 58m/s, the rolling temperature is 930 +/-30 ℃, the temperature before finish rolling is 900 +/-20 ℃, the temperature before the reducing unit 2 is 840 +/-20 ℃, the spinning temperature is 790 +/-15 ℃, and the specific water cooling process control method is as follows:
(1) referring to fig. 1 and 2, before the finishing mill group 1, the three-way valve 18 of the first water tank 5 is opened, the three-way valve 18 of the second water tank 6 is closed, the forward blowing air 14, the back blowing air 15 and the back blowing water 16 of the water passing guide groove 13 of the first water tank 5 are opened, the second secondary valve 17 of the three secondary valves 17 connected with the first water tank 5 is closed, and the water amount is set to be 90-110 m3The water pressure is set to be more than 0.1MPa, the temperature difference of the red steel in the same direction before finish rolling is controlled within 25 ℃, and the temperature difference of the cross section is controlled within 25 ℃;
(2) before the reducing unit 2, opening the three-way valves 18 of the third water tank 7 and the fourth water tank 8, and closing the three-way valve 18 of the fifth water tank 9; the third water tank 7 opens the positive blowing air 14, the back blowing air 15 and the back blowing water 16 of the water through guide groove 13 and closes the connectionThe second 17 of the three secondary valves 17 of the third tank 7, the water quantity set to 120m3H, the water pressure is set to be more than 0.1MPa, the opening degree of an overflow valve 19 is less than 40%, the fourth water tank 8 opens the forward blowing air 14, the back blowing air 15 and the back blowing water 16 of the water penetrating guide groove 13, closes the second secondary valve 17 of the three secondary valves 17 connected with the fourth water tank 8, and the water amount is set to be 50-80 m3And h, setting the water pressure to be more than 0.1MPa, controlling the opening of the overflow valve to be less than 40%, controlling the temperature difference of the red steel in the front of the reducing unit 2 in the same direction except the high-temperature section within 25 ℃, and controlling the temperature difference of the cross section within 20 ℃.
(3) Before the laying head 3, a three-way valve 18 of a sixth water tank 10 and a seventh water tank 11 is opened, the sixth water tank 10 opens forward blowing air 14, reverse blowing air 15 and reverse blowing water 16 of a water penetrating guide groove 13, a second secondary valve 17 of the sixth water tank 10 is closed, and the water quantity is set to be 120m3The water pressure is set to be more than 0.1MPa, and the opening degree of the overflow valve 19 is less than 35%; the seventh water tank 11 opens the positive blowing air 14, the back blowing air 15 and the back blowing water 16 of the water through guide groove 13, closes the second secondary valve 17 of the seventh water tank 11, and sets the water amount to be 50-80 m3The water pressure is set to be more than 0.1MPa, the opening degree of the overflow valve 19 is less than 35%, the temperature difference of the red steel in the same direction except the high-temperature section before spinning is controlled within 20 ℃, the temperature difference of the cross section is controlled within 20 ℃, and the high-temperature section of the spinning head is controlled within 10 circles.
Example 3: a process control method for shortening the temperature difference of a water-cooling section of a steel wire rod for a phi 13.0mm steel strand.
160mm2The high-carbon steel of the square billet is rolled into a phi 13.0mm wire rod by a two-frame type reducing unit 2 at a finish rolling speed of 32m/s, the initial rolling temperature is 1080 +/-30 ℃, the temperature before finish rolling is 900 +/-20 ℃, the temperature before reducing is 840 +/-20 ℃, the spinning temperature is 900 +/-15 ℃, and the specific water cooling process control method is as follows:
(1) referring to fig. 1 and 2, the three-way valve 18 of the first water tank 5 and the three-way valve 18 of the second water tank 6 are opened before the finishing mill group 1, the forward blowing air 14, the reverse blowing air 15 and the reverse blowing water 16 of the water through guide grooves 13 of the first water tank 5 are opened, the second secondary valve 17 of the first water tank 5 is closed, and the water quantity is set to be 150m3The water pressure is set to be more than 0.1 MPa; the second water tank 6 opens the positive blowing air 14, the back blowing air 15 and the back blowing water 16 of the water through guide groove 13 and closes the second water tankThe water quantity of the second secondary valve 17 of the second water tank 6 is set to be 90-120 m3And h, setting the water pressure to be more than 0.1MPa, controlling the temperature difference of the red steel in the same direction to be within 25 ℃ before finish rolling, and controlling the temperature difference of the cross section to be within 25 ℃.
(2) Before the reducing unit 2, a three-way valve 18 of a third water tank 7 is opened, three-way valves 18 of a fourth water tank 8 and a fifth water tank 9 are closed, a forward blowing gas 14, a back blowing gas 15 and a back blowing water 16 of a water penetrating guide groove 13 are opened by the third water tank 7, a second secondary valve 17 of the third water tank 7 is closed, and the water quantity is set to be 40-70 m3And h, setting the water pressure to be more than 0.1MPa, opening the overflow valve to be less than 35%, controlling the temperature difference of the red steel in the front of the reducing unit 2 except the high-temperature section in the same direction to be within 20 ℃, and controlling the temperature difference of the cross section to be within 20 ℃.
(3) The three-way valve 18 of the sixth water tank 10 is opened before the laying head 3, the three-way valve 18 of the seventh water tank 11 is closed, the forward blowing air 14, the back blowing air 15 and the back blowing water 16 penetrating through the water guide groove 13 of the sixth water tank 10 are opened, the second secondary valve 17 of the sixth water tank 10 is closed, and the water quantity is set to be 60-90 m3The water pressure is set to be more than 0.1MPa, the opening degree of the overflow valve 19 is less than 30%, the temperature difference of the same-direction poker bars of the red steel before spinning except the high-temperature section is controlled within 20 ℃, the temperature difference of the cross section is controlled within 15 ℃, and the high-temperature section of the spinning head is controlled within 4 circles.
In the normal production process, a group of positive blowing air 14, two groups of back blowing air 15 and two groups of back blowing water 16 which penetrate through the water guide grooves 13 in the first water tank 5, the third water tank 7 and the sixth water tank 10 are opened, on one hand, the cooling water in each water tank is sealed, the cooling effect is increased, and on the other hand, the surface water stain at the rear part of the red steel water outlet tank is removed, so that the temperature difference of the cross section is reduced.
The invention is obtained through a plurality of field tests, the water pressure of each water tank used in the water cooling process is generally controlled within the range of 0.1-1.0 MPa, and the water cooling uniformity of each specification wire rod can be obviously improved. When the pressure does not reach the control range, the secondary valves 17 of the water tanks are closed from back to front in sequence. The flow rate control mode is adopted for each three-way valve 18 using the tank, and the opening degree control mode is adopted for the relief valve 19. The flow control mode of the three-way valve 18 is to ensure stable water flow and avoid interference of external water pressure, thereby ensuring stable control of key temperature of the rolling line. The relief valve 19 adopts an opening control mode to produce a pressure build-up effect, thereby increasing the initial water flow rate. At the moment when the three-way valve 18 is started, the water pressure in the corresponding water tank is greater than 0.2MPa, and when the pressure does not reach the control range, the opening degree of the overflow valve 19 is reduced by 1%.
The invention has the advantages that: the time of the temperature return section of the red steel after forced cooling is increased by preferentially using the water tank of the previous pass, and in addition, the water seal and the air seal of the inlet and the outlet of the water tank are utilized to remove the water film on the surface of the red steel, so that the maximum value of the temperature difference of the surface section of the red steel is controlled within 25 ℃, and the temperature uniformity of the red steel entering the next rolling procedure or spinning procedure is ensured. The effect of pressurizing each used water tank is realized by changing the using quantity of the water tanks and controlling the opening degree of the overflow valve 19, and when the water pressure is increased, the cooling uniformity of the same section of the red steel is improved in the water passing guide groove 13 due to the increase of buoyancy. In addition, a partial water tank centralized cooling mode is used for replacing all water tank distributed cooling modes in the water cooling process, and the non-overlapping transition length of the high-temperature sections of the red steel heads in the cooling control process of each water tank is reduced by reducing the using number of the water tanks. Furthermore, the three-way valve 18 of each water tank adopts a flow control mode, so that the initial water flow is greater than the middle process water flow, and the initial water flow is complementary with the high temperature of the head of the red steel and the low temperature of the middle steel to form cooling, thereby achieving the effect of reducing the temperature difference of the cross section of the poker.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (3)
1. A process control method for shortening the temperature difference of a water cooling section of a high-speed wire is characterized by comprising the following steps: comprises the following steps:
a. collecting electric signals by online pyrometers arranged in front of and behind the finishing mill group, the reducing mill group and the laying head to feed back temperature signals in real time, calculating the length of a high-temperature segment with the head temperature of the red steel and the middle stable temperature different by 25 ℃ according to the relation data of the temperature and the time stored in the PDA, judging the control level of the temperature difference of the red steel poker bars in each section in front of the finishing mill group, the reducing mill group and the laying head according to the temperature fluctuation condition in the PDA, and judging the control level of the temperature difference of the same section of the red steel by measuring the temperature by a handheld temperature measuring gun;
b. during normal operation, a three-way valve connected with a first water tank in front of a finishing mill set is opened, a three-way valve connected with a second water tank is closed, a three-way valve connected with a third water tank in front of a reducing mill set is opened, a three-way valve connected with a fourth water tank and a fifth water tank is closed, a three-way valve connected with a sixth water tank in front of a laying head is opened, a three-way valve connected with a seventh water tank is closed, a group of positive blowing air, two groups of back blowing air and two groups of back blowing water in the water penetrating guide grooves in the first water tank, the third water tank and the sixth water tank are synchronously opened, and a secondary valve in the middle of three secondary valves connected with the water penetrating guide grooves;
a plurality of water through guide grooves are arranged in each water tank along the rolling direction, positive blowing air is connected to the water through guide grooves at the end parts of the water tanks, two groups of back blowing air and two groups of back blowing water are respectively connected to the water through guide grooves at the tail ends of the water tanks, the two groups of back blowing air and the two groups of back blowing water are arranged in a staggered manner, and three water through guide grooves in the middle of each water tank are respectively connected with a secondary valve and a three-way valve and an overflow valve;
c. when the water quantity of the first water tank in front of the finishing mill group exceeds 150m3H, the water quantity of a third water tank behind the finishing mill group exceeds 120m3When the water tank is in the second water tank, the second water tank is opened before the finishing mill group, the fourth water tank and the fifth water tank are opened before the reducing mill group, and the seventh water tank is opened before the laying head;
d. the water pressure of each water tank in use is controlled within the range of 0.1-1.0 MPa.
2. The process control method for shortening the temperature difference of the water cooling section of the high-speed wire as claimed in claim 1, which is characterized in that: the three-way valve adopts a flow control mode, so that the starting water flow is greater than the middle process water flow, and the starting water flow is complementary with the red steel head at high temperature and the middle temperature to form cooling so as to achieve the effect of reducing the temperature difference of the section of the poker.
3. The process control method for shortening the temperature difference of the water cooling section of the high-speed wire as claimed in claim 2, which is characterized in that: at the moment of starting the three-way valve, the water pressure of the used water tank is more than 0.2MPa, and when the pressure does not reach the control range, the opening degree of an overflow valve connected with the three-way valve is reduced by 1%.
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