CN110773575A - Control method for surface defects of wire rod - Google Patents

Control method for surface defects of wire rod Download PDF

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Publication number
CN110773575A
CN110773575A CN201911064698.2A CN201911064698A CN110773575A CN 110773575 A CN110773575 A CN 110773575A CN 201911064698 A CN201911064698 A CN 201911064698A CN 110773575 A CN110773575 A CN 110773575A
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China
Prior art keywords
water
water tank
wire rod
cooling
cooling nozzle
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Application number
CN201911064698.2A
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Chinese (zh)
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CN110773575B (en
Inventor
李成良
寻忠忠
刘春林
张广化
马超
吴德兴
王庆贺
胡娟
刘金源
刘安明
程羲
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SGIS Songshan Co Ltd
Shaogang Songshan Co Ltd Guangdong
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Shaogang Songshan Co Ltd Guangdong
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Priority to CN201911064698.2A priority Critical patent/CN110773575B/en
Publication of CN110773575A publication Critical patent/CN110773575A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0224—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

The application provides a control method of surface defects of wire rods, and belongs to the technical field of wire rod rolling. The control method of the surface defects of the wire rod is suitable for the wire rod processing production line. The wire rod processing production line comprises a pre-finish rolling device, a first water tank and a second water tank which are arranged in sequence. The wire rod can pass through the pre-finish rolling device, the first water tank and the second water tank in sequence along the rolling direction. The first water tank and the second water tank respectively comprise a plurality of water-cooling nozzles which are sequentially arranged along the rolling direction. The control method includes sequentially turning on all of the plurality of water-cooling nozzles of the first water tank in reverse with respect to the rolling direction and then sequentially turning on at least one of the plurality of water-cooling nozzles of the second water tank in reverse with respect to the rolling direction when the end of the wire rod passes through the water-cooling nozzle at the outlet of the first water tank. The control method can improve the pitted surface defect of the surface of the wire rod and enable the surface of the wire rod to be smoother.

Description

Control method for surface defects of wire rod
Technical Field
The application relates to the technical field of wire rod rolling, in particular to a control method for surface defects of a wire rod.
Background
The production process route of the wire rod is generally heating, high-pressure water descaling, rough rolling, medium rolling, pre-finish rolling, cooling, sizing reducing, cooling, spinning, stelmor air cooling line, coil collecting, PF line cooling, packaging and warehousing. The temperature of the wire rod is continuously increased in the pre-finish rolling process, and in order to meet the temperature requirement of the finish rolling process, cooling is required between the pre-finish rolling device and the finish rolling device; the temperature of the wire rod is continuously increased in the finish rolling process, and in order to meet the temperature requirement of the reducing and sizing process, the wire rod needs to be cooled between the finish rolling and the reducing and sizing device.
In the prior art, a plurality of water tanks are generally arranged between a pre-finishing rolling device and a finishing rolling device, and a plurality of water tanks are arranged between the finishing rolling device and the finishing rolling device, and the opening of the plurality of water tanks is controlled, so that a wire rod is cooled to a target temperature. The inventor finds that the existing cooling mode can cause pitted surface defects on the surface of the wire rod.
Disclosure of Invention
The application aims to provide a control method of surface defects of a wire rod, which can improve pitted surface defects on the surface of the wire rod and enable the surface of the wire rod to be smoother.
In a first aspect, an embodiment of the present application provides a control method for a surface defect of a wire rod, which is applicable to a wire rod processing production line, where the wire rod processing production line includes a pre-finish rolling device, a first water tank, and a second water tank, which are sequentially arranged. The wire rod can sequentially pass through a pre-finish rolling device, a first water tank and a second water tank along the rolling direction; the first water tank and the second water tank respectively comprise a plurality of water-cooling nozzles which are sequentially arranged along the rolling direction. The control method comprises the following steps: when the end of the wire rod passes through the water-cooling nozzle at the outlet of the first water tank, all of the plurality of water-cooling nozzles of the first water tank are sequentially opened in a reverse direction with respect to the rolling direction, and then when the end of the wire rod passes through the water-cooling nozzle at the outlet of the second water tank, at least one of the plurality of water-cooling nozzles of the second water tank is sequentially opened in a reverse direction with respect to the rolling direction.
After the wire rod is subjected to pre-finish rolling and rolling, when the wire rod is cooled, the plurality of water cooling nozzles of the first water tank are reversely opened, and then the at least one water cooling nozzle of the second water tank is reversely and sequentially opened, so that the wire rod can be rapidly cooled, the time of a high-temperature section is shortened, the metal oxide generated on the surface of the wire rod is reduced, the thickness of the metal oxide is reduced, the pitted surface defect of the finally obtained wire rod is reduced, and the surface of the wire rod is smoother.
In one possible embodiment, the control method further includes: after the plurality of water-cooling nozzles of the first water tank are all opened, the temperature of the wire rod at the outlet of the second water tank is detected. And if the temperature of the wire rod at the outlet of the second water tank is detected to be higher than the first cooling target temperature of the wire rod, sequentially opening a plurality of water cooling nozzles of the second water tank in a reverse direction relative to the rolling direction. And stopping opening the water-cooling nozzles remaining in the second water tank if it is detected that the temperature of the wire rod at the outlet of the second water tank is equal to or lower than the first cooling target temperature of the wire rod.
And after pre-finish rolling and rolling of different wire rods, the first cooling target temperatures of the different wire rods cooled by the first water tank and the second water tank are different. The arrangement of the water cooling nozzles of the water tanks is matched with the detected temperature at the outlet of the second water tank, so that the wire rods with different specifications can be rapidly cooled to the corresponding first cooling target temperature range, and pitted surface defects of different wire rods can be improved.
In one possible embodiment, if it is detected that the temperature of the wire rod at the outlet of the second water tank is lower than the first cooling target temperature of the wire rod, the flow rate of the water-cooling nozzle that was turned on last time is adjusted to be small so that the detected temperature of the wire rod at the outlet of the second water tank is within the range of the first cooling target temperature.
The number of the water cooling nozzles in the second water tank can be adjusted, the flow rate of the water cooling nozzles in the second water tank can be adjusted, so that the wire rods with different specifications can be cooled to the corresponding first cooling target temperature, and pitted surface defects of the wire rods with different specifications can be improved.
In a possible embodiment, a first water cooling nozzle, a second water cooling nozzle, a third water cooling nozzle, a fourth water cooling nozzle, a fifth water cooling nozzle and a sixth water cooling nozzle are arranged in the first water tank in sequence along the rolling direction, and a first water cooling nozzle, a second water cooling nozzle, a third water cooling nozzle, a fourth water cooling nozzle, a fifth water cooling nozzle, a sixth water cooling nozzle, a seventh water cooling nozzle and an eighth water cooling nozzle are arranged in the second water tank in sequence along the rolling direction.
The control method comprises the steps of starting an eighth water-cooling nozzle of the second water tank if the temperature of the wire rod at the outlet of the second water tank is detected to be higher than the first cooling target temperature of the wire rod; and if the temperature of the wire rod at the outlet of the second water tank is detected to be higher than the first cooling target temperature of the wire rod again, continuously opening the seventh water-cooling nozzle of the second water tank, and repeating the steps until the temperature of the wire rod at the outlet of the second water tank is within the range of the first cooling target temperature.
If the temperature of the wire rod at the outlet of the second water tank is detected to be higher than the first cooling target temperature of the wire rod, the eighth water-cooling nozzle of the second water tank is opened (it should be noted that, because the first cooling target temperatures of the wire rods with different specifications are different and the temperatures of the wire rods with different specifications after pre-finish rolling are also different, the seventh water-cooling nozzle, the sixth water-cooling nozzle, the fifth water-cooling nozzle, the fourth water-cooling nozzle, the third water-cooling nozzle, the second water-cooling nozzle and the first water-cooling nozzle in the second water tank may be continuously and sequentially opened in a reverse direction, and one of the water-cooling nozzles in the second water tank is selected to stop reversely opening the remaining water-cooling nozzles, but not only to stop opening the remaining water-cooling nozzles after the eighth water-cooling nozzle is opened, for example, when the seventh water-cooling nozzle is selected to be opened, it should be clear that the eighth water-cooling nozzles are all opened, the flow is maximum, and the first cooling target temperature cannot be met at the moment, so that a seventh water-cooling nozzle arranged in the reverse rolling direction is selected to be opened); and if the temperature of the wire rod at the outlet of the second water tank is detected to be lower than the first cooling target temperature of the wire rod again, adjusting the flow of an eighth water-cooling nozzle (correspondingly, any one of a seventh, a sixth, a fifth, a fourth, a third, a second or a first water-cooling nozzle) of the second water tank to be smaller, so that the detected temperature of the wire rod at the outlet of the second water tank is within the range of the first cooling target temperature. According to the cooling demand of the wire rod, six water-cooling nozzles are arranged in the first water tank, eight water-cooling nozzles are arranged in the second water tank, and the number of the water-cooling nozzles of the second water tank is adjusted, and the flow of the water-cooling nozzles of the second water tank is adjusted, so that the wire rods with different specifications can be cooled to the corresponding first cooling target temperature, and the pitted surface defects of different wire rods can be improved.
In a possible embodiment, the wire rod processing production line further comprises a finish rolling device, a third water tank and a fourth water tank which are positioned at the downstream of the second water tank and are sequentially arranged along the rolling direction, and the wire rod can sequentially pass through the finish pre-rolling device, the first water tank, the second water tank, the finish rolling device, the third water tank and the fourth water tank along the rolling direction; and the third water tank and the fourth water tank respectively comprise a plurality of water-cooling nozzles which are sequentially arranged along the rolling direction.
The control method further comprises the following steps: if the specification of the wire rod is less than 12.5mm, when the end of the wire rod passes through the water-cooling nozzles at the outlet of the third water tank, all of the plurality of water-cooling nozzles of the third water tank are sequentially opened in a reverse direction with respect to the rolling direction, and then when the end of the wire rod passes through the water-cooling nozzles at the outlet of the fourth water tank, at least one of the plurality of water-cooling nozzles of the fourth water tank is sequentially opened in a reverse direction with respect to the rolling direction.
And if the specification of the wire rod is larger than or equal to 12.5mm, the finish rolling device is empty, and the plurality of water cooling nozzles of the third water tank and the fourth water tank are all in a closed state.
If the specification of the wire rod is smaller than 12.5mm, the wire rod is cooled by the first water tank and the second water tank, then is subjected to finish rolling, and is cooled by the third water tank and the fourth water tank. The water cooling nozzles of the third water tank are reversely opened, and then the at least one water cooling nozzle of the fourth water tank is reversely opened, so that the wire rod with the specification smaller than 12.5mm can be rapidly cooled, the time of a high-temperature section is reduced, the metal oxide generated on the surface of the thin wire rod is reduced, the thickness of the metal oxide is reduced, the pitted surface defect of the finally obtained thin wire rod is reduced, and the surface of the thin wire rod is smoother.
If the gauge of the wire rod is greater than or equal to 12.5mm, rolling in the finishing mill group is not required, and cooling in the third and fourth water tanks is not required.
In a possible embodiment, the control method further comprises detecting the temperature of the wire rod at the outlet of the fourth water tank after all of the plurality of water cooling nozzles of the third water tank are turned on. And if the temperature of the wire rod at the outlet of the fourth water tank is detected to be higher than the second cooling target temperature of the wire rod, sequentially opening a plurality of water cooling nozzles of the fourth water tank in a reverse direction relative to the rolling direction. And stopping opening of the water-cooling nozzles remaining in the fourth water tank if it is detected that the temperature of the wire rod at the outlet of the fourth water tank is equal to or lower than the second cooling target temperature of the wire rod.
Different types of wire rods with the specification of less than 12.5mm are rolled by the finishing mill group, and the second cooling target temperatures of the wire rods cooled by the third water tank and the fourth water tank are different. The arrangement of the water cooling nozzles of the water tanks is matched with the detected temperature at the outlet of the fourth water tank, so that the wire rods with different specifications can be rapidly cooled to the corresponding second cooling target temperature range, and pitted surface defects of different wire rods can be improved.
In one possible embodiment, if it is detected that the temperature of the wire rod at the outlet of the fourth water tank is lower than the second cooling target temperature of the wire rod, the flow rate of the water-cooling nozzle that was turned on last time is adjusted to be small so that the temperature of the wire rod at the outlet of the fourth water tank is detected to be within the range of the second cooling target temperature.
The number of the water cooling nozzles in the fourth water tank can be adjusted, the flow rate of the water cooling nozzles in the fourth water tank can be adjusted, so that the wire rods with different specifications and diameters smaller than 12.5mm can be cooled to the corresponding second cooling target temperature, and pitted surface defects of the wire rods with different specifications can be improved.
In one possible embodiment, the first water-cooling nozzle, the second water-cooling nozzle, the third water-cooling nozzle, the fourth water-cooling nozzle, the fifth water-cooling nozzle, the sixth water-cooling nozzle, the seventh water-cooling nozzle and the eighth water-cooling nozzle are sequentially arranged in the third water tank along the rolling direction, and the first water-cooling nozzle, the second water-cooling nozzle, the third water-cooling nozzle, the fourth water-cooling nozzle, the fifth water-cooling nozzle, the sixth water-cooling nozzle, the seventh water-cooling nozzle and the eighth water-cooling nozzle are sequentially arranged in the fourth water tank along the rolling direction.
The control method comprises the steps of starting an eighth water-cooling nozzle of the fourth water tank if the temperature of the wire rod at the outlet of the fourth water tank is detected to be higher than a second cooling target temperature of the wire rod; and if the temperature of the wire rod at the outlet of the fourth water tank is detected to be higher than the second cooling target temperature of the wire rod again, continuously opening a seventh water-cooling nozzle of the fourth water tank, and repeating the steps until the temperature of the wire rod at the outlet of the fourth water tank is within the range of the second cooling target temperature.
If the temperature of the wire rod at the outlet of the fourth water tank is detected to be higher than the second cooling target temperature of the wire rod, the eighth water-cooling nozzle of the fourth water tank is opened (it should be noted that, because the second cooling target temperatures of the wire rods with different specifications are different and the temperatures of the different wire rods after being rolled by the finishing mill group are also different, the seventh water-cooling nozzle, the sixth water-cooling nozzle, the fifth water-cooling nozzle, the fourth water-cooling nozzle, the third water-cooling nozzle, the second water-cooling nozzle and the first water-cooling nozzle in the fourth water tank may be continuously and sequentially opened in a reverse direction, and one of the water-cooling nozzles in the fourth water tank is selected to stop reversely opening the remaining water-cooling nozzles, but not only to stop opening the remaining water-cooling nozzles after the eighth water-cooling nozzle is opened, for example, when the seventh water-cooling nozzle is selected to be opened, it should be clear that the eighth water-cooling nozzle is already opened completely, the flow is maximum, and the first cooling target temperature cannot be met at the moment, so that a seventh water-cooling nozzle arranged in the reverse rolling direction is selected to be opened); and if the temperature of the wire rod at the outlet of the fourth water tank is detected to be lower than the second cooling target temperature of the wire rod again, the flow rate of an eighth water-cooling nozzle (correspondingly, any one of a seventh, a sixth, a fifth, a fourth, a third, a second or a first water-cooling nozzle) of the fourth water tank is reduced, so that the detected temperature of the wire rod at the outlet of the fourth water tank is within the range of the second cooling target temperature.
According to the cooling demand of wire rods, eight water-cooling nozzles are arranged in the third water tank, eight water-cooling nozzles are arranged in the fourth water tank, and the number of the water-cooling nozzles of the fourth water tank is adjusted, and the flow of the water-cooling nozzles of the fourth water tank is adjusted, so that the wire rods with different specifications and the diameter smaller than 12.5mm can be cooled to the corresponding second cooling target temperature, and the pitted surface defects of the wire rods with different specifications can be improved.
In a possible embodiment, the wire rod processing line further comprises a reducing and sizing device, a fifth water tank and a laying head device which are positioned downstream of the fourth water tank and are arranged in sequence along the rolling direction, and the wire rod can pass through the pre-finishing device, the first water tank, the second water tank, the finishing device, the third water tank, the fourth water tank, the reducing and sizing device, the fifth water tank and the laying head device in sequence along the rolling direction; the fifth water tank comprises a plurality of water-cooling nozzles which are sequentially arranged along the rolling direction. And when the end of the wire rod moves to the water-cooling nozzle close to the outlet of the fifth water tank, the plurality of water-cooling nozzles in the fifth water tank are sequentially opened in a reverse direction relative to the rolling direction.
After the wire rod is rolled by the reducing sizing mill unit, a plurality of nozzles of the fifth water tank are reversely and sequentially opened, so that the wire rod can be rapidly cooled, the time of a high-temperature section is reduced, the metal oxide generated on the surface of the wire rod is reduced, the thickness of the metal oxide is reduced, the pitted surface defect of the finally obtained wire rod is reduced, and the surface of the wire rod is smoother.
In one possible embodiment, the water pressure of the water sprayed from the first water tank, the second water tank, the third water tank, the fourth water tank and the fifth water tank is not less than 350 KPa.
In the process of cooling the wire rod, the water pressure is high, so that the uniformity of the temperature on the surface of the wire rod is better, and the phenomena of water spraying, water soaking and the like are avoided.
The control method for the surface defects of the wire rod has the advantages that:
after the wire rod is rolled by the pre-finishing mill group, in the process of cooling the wire rod, the plurality of water-cooling nozzles of the first water tank are reversely opened firstly, and then at least one of the plurality of water-cooling nozzles of the second water tank is reversely opened, so that the wire rod can be rapidly cooled, the time of a high-temperature section is reduced, the metal oxide generated on the surface of the wire rod is reduced, the thickness of the metal oxide is reduced, the pitted surface defect of the finally obtained wire rod is reduced, and the surface of the wire rod is smoother.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments are briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive efforts and also belong to the protection scope of the present application.
Fig. 1 is a flow chart of a production line of a wire rod provided in an embodiment of the present application;
fig. 1A is a photograph of a wire rod provided in example 1 of the present application;
FIG. 1B is a photograph of the wire rod provided in comparative example 1;
FIG. 1C is a photograph of a wire rod provided in comparative example 2;
fig. 2A is a photograph of a wire rod provided in example 2 of the present application;
fig. 2B is a photograph of the wire rod provided in comparative example 3;
fig. 2C is a photograph of the wire rod provided in comparative example 4.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
Fig. 1 is a flowchart of a production line of a wire rod according to an embodiment of the present disclosure. Referring to fig. 1, in the present application, a production line of a wire rod includes a heating device, a high-pressure water descaling device, a rough rolling device, a middle rolling device, a pre-finish rolling device, a first water tank, a second water tank, a finish rolling device, a third water tank, a fourth water tank, a reducing and sizing device, a fifth water tank, a spinning device, a stelmor cooling control device, a coil collecting device, and a PF line cooling device, which are sequentially arranged along a rolling direction of the wire rod. The production process of the wire rod generally comprises heating, high-pressure water descaling, rough rolling, medium rolling, pre-finish rolling, primary cooling, finish rolling, secondary cooling, sizing reduction, tertiary cooling, spinning, stelmor air cooling line, coil collection, PF line cooling, packaging and warehousing.
In the embodiment of the application, the control method of the surface defects of the wire rod comprises the step that the wire rod sequentially passes through a heating device, a high-pressure water descaling device, a rough rolling device, a middle rolling device, a pre-finish rolling device, a first water tank, a second water tank, a finish rolling device, a third water tank, a fourth water tank, a reducing and sizing device, a fifth water tank, a spinning device, a stelmor cooling control device, a coil collecting device and a PF line cooling device along the rolling direction.
The first water tank and the second water tank are correspondingly cooled for the first time, the third water tank and the fourth water tank are correspondingly cooled for the second time, and the fifth water tank is correspondingly cooled for the third time. In the embodiment of the application, the first water tank, the second water tank, the third water tank, the fourth water tank and the fifth water tank all comprise a plurality of water cooling nozzles which are sequentially arranged along the rolling direction of the wire rod.
The production process of the wire rod comprises two types of specification ranges, namely: the specification of the wire rod is greater than or equal to 12.5 mm; the second type: the specification of the wire rod is less than 12.5 mm. Regardless of whether the specification of the wire rod belongs to the first type or the second type, the wire rod sequentially passes through a heating device, a high-pressure water descaling device, a rough rolling device, a middle rolling device, a pre-finish rolling device, a first water tank, a second water tank, a finish rolling device, a third water tank, a fourth water tank, a reducing and sizing device, a fifth water tank, a spinning device, a stelmor cooling control device, a coil collecting device and a PF line cooling device along the rolling direction in the production process.
The difference is that if the first type of wire rod passes through the finish rolling device, the finish rolling device is empty, the third water tank and the fourth water tank do not work, namely, although the first type of wire rod passes through the finish rolling device, the third water tank and the fourth water tank, the first type of wire rod cannot be rolled by the wire rod when passing through the finish rolling device, and when the first type of wire rod passes through the third water tank and the fourth water tank, the water cooling nozzles in the third water tank and the fourth water tank are all in a closed state, so that secondary cooling cannot be performed.
And if the second type of wire rod is the wire rod of the second type, the finish rolling device, the third water tank and the fourth water tank work, namely, the second type of wire rod is rolled by the finish rolling device and then is cooled for the second time by the third water tank and the fourth water tank.
The first cooling process performed in the first and second water tanks after the pre-finish rolling performed by the pre-finish rolling device is the same regardless of the first type of wire rod or the second type of wire rod. Wherein, when the end of wire rod transports the water-cooling nozzle through the exit of first water tank, open the whole of a plurality of water-cooling nozzles of first water tank in proper order for the rolling direction of wire rod is reverse, then when the end of wire rod passes the water-cooling nozzle of the exit of second water tank, open at least one in a plurality of water-cooling nozzles of second water tank in proper order for the rolling direction of wire rod is reverse.
Optionally, a first temperature measuring instrument for detecting the temperature of the wire rod is arranged at the outlet of the second water tank, and after all the water cooling nozzles of the first water tank are opened, the temperature of the wire rod at the outlet of the second water tank is detected by the first temperature measuring instrument. And if the temperature of the wire rod at the outlet of the second water tank is detected to be higher than the first cooling target temperature of the wire rod, sequentially opening a plurality of water cooling nozzles of the second water tank in a reverse direction relative to the rolling direction. And stopping opening the water-cooling nozzles remaining in the second water tank if it is detected that the temperature of the wire rod at the outlet of the second water tank is equal to or lower than the first cooling target temperature of the wire rod.
And if the temperature of the wire rod at the outlet of the second water tank is detected to be lower than the first cooling target temperature of the wire rod, the flow of the water-cooling nozzle which is opened last time is adjusted to be small, so that the temperature of the wire rod at the outlet of the second water tank is detected to be within the range of the first cooling target temperature.
Furthermore, a first water-cooling nozzle, a second water-cooling nozzle, a third water-cooling nozzle, a fourth water-cooling nozzle, a fifth water-cooling nozzle and a sixth water-cooling nozzle are sequentially arranged in the first water tank along the rolling direction of the wire rod. In the first water tank, a first water-spraying nozzle and a first gas-spraying blowing pipe are arranged at the downstream of the sixth water-cooling nozzle (the downstream refers to the rear end along the rolling direction of the wire rod, namely, the downstream passes through the plurality of water-cooling nozzles, and then passes through the first water-spraying nozzle and the first gas-spraying blowing pipe). And a first water-cooling nozzle, a second water-cooling nozzle, a third water-cooling nozzle, a fourth water-cooling nozzle, a fifth water-cooling nozzle, a sixth water-cooling nozzle, a seventh water-cooling nozzle and an eighth water-cooling nozzle are sequentially arranged in the second water tank along the rolling direction of the wire rod. And a second anti-flutter water spray nozzle and a second anti-flutter air purging pipe are further arranged at the downstream of the eighth water-cooling nozzle in the second water tank.
When the end of the wire rod passes through the sixth water-cooling nozzle of the first water tank, the sixth water-cooling nozzle, the fifth water-cooling nozzle, the fourth water-cooling nozzle, the third water-cooling nozzle, the second water-cooling nozzle and the first water-cooling nozzle of the first water tank are sequentially opened, the wire rod is cooled through the first water tank, and then passes through the first water-back water-spraying nozzle and the first air-back purging pipe in the first water tank (wherein, the first water tank works, the first water-back water-spraying nozzle and the first air-back purging pipe in the first water tank are always opened), and the first water-back water-spraying and the first air-back purging are carried out on the wire rod. And then when the end of the wire rod passes through an eighth water-cooling nozzle of the second water tank, sequentially opening an eighth water-cooling nozzle, a seventh water-cooling nozzle, a sixth water-cooling nozzle, a fifth water-cooling nozzle, a fourth water-cooling nozzle, a third water-cooling nozzle, a second water-cooling nozzle and a first water-cooling nozzle of the second water tank, cooling the wire rod through the second water tank, and then performing secondary anti-flutter water and secondary anti-flutter gas treatment on the wire rod through a second anti-flutter water nozzle and a second anti-flutter gas purging pipe in the second water tank (wherein, the second water tank works, the second anti-flutter water nozzle and the second anti-flutter gas purging pipe in the second water tank are always opened).
After the wire rod is subjected to pre-finish rolling, cooling the wire rod, reversely opening a plurality of water-cooling nozzles of a first water tank, and then performing first water and gas backwashing treatment on the wire rod; and reversely opening the plurality of water-cooling nozzles of the second water tank, and then carrying out secondary water and gas backwashing treatment on the wire rod. Can make the wire rod cool off fast, reduce the high temperature section time, get rid of the moisture on wire rod surface, guarantee not ponding on the surface of wire rod in wire rod cooling process, can reduce the wire rod surface and take place oxidation reaction, reduce the metal oxide that the wire rod surface produced, make metal oxide's thickness reduce to reduce the defect that the wire rod surface produced, make the surface of wire rod more smooth.
In the embodiment of the application, the plurality of water cooling nozzles in the second water tank are not necessarily all opened, and the first temperature measuring instrument for detecting the temperature of the wire rod is arranged at the outlet of the second water tank, so that the wire rod passing through the first water tank and the second water tank has a first cooling target temperature, the first temperature measuring instrument can measure the real-time temperature of the wire rod after being cooled by the first water tank and the second water tank, and if the real-time temperature is within the range of the first cooling target temperature, the wire rod meets the cooling requirement.
For example: after the six water-cooling nozzles in the first water tank are all opened in sequence, if the temperature of the wire rod at the outlet of the second water tank is higher than the first cooling target temperature of the wire rod, continuing to open the eighth water-cooling nozzle of the second water tank; and if the temperature of the wire rod at the outlet of the second water tank is detected to be higher than the first cooling target temperature of the wire rod again by the first temperature detector, continuously opening the seventh water-cooling nozzle of the second water tank, and repeating the steps until the temperature of the wire rod at the outlet of the second water tank is within the range of the first cooling target temperature.
In other embodiments, if it is detected that the temperature of the wire rod at the outlet of the second water tank is higher than the first cooling target temperature of the wire rod, the eighth water-cooling nozzle of the second water tank is turned on; and if the temperature of the wire rod at the outlet of the second water tank is detected to be lower than the first cooling target temperature of the wire rod again, the flow of the eighth water-cooling nozzle of the second water tank is reduced, so that the detected temperature of the wire rod at the outlet of the second water tank is within the range of the first cooling target temperature. Of course, the flow rates of the other water cooling nozzles of the second water tank may also be adjusted according to the cooling demand of the wire rod until the temperature of the wire rod at the outlet of the second water tank is within the range of the first cooling target temperature.
The number of the water-cooling nozzles of the second water tank can be adjusted, and the flow of the water-cooling nozzles of the second water tank can be adjusted, so that the wire rods with different specifications can be cooled to the corresponding first cooling target temperature, and pitted surface defects of different wire rods can be improved. Of course, the water cooling nozzles in the second water tank can also be opened completely in reverse order for the cooling requirements of the wire rod.
And if the wire rod is the second type wire rod (the specification of the wire rod is less than 12.5mm), the finish rolling device, the third water tank and the fourth water tank work. When the end of the wire rod moves to the water-cooling nozzle close to the outlet of the third water tank, all of the plurality of water-cooling nozzles of the third water tank are sequentially opened in a reverse direction relative to the rolling direction of the wire rod, and then when the end of the wire rod passes through the water-cooling nozzle at the outlet of the fourth water tank, at least one of the plurality of water-cooling nozzles of the fourth water tank is sequentially opened in a reverse direction relative to the rolling direction of the wire rod.
Optionally, a second temperature measuring instrument for detecting the temperature of the wire rod is arranged at the outlet of the fourth water tank, and after all the plurality of water-cooling nozzles of the third water tank are opened, the temperature of the wire rod at the outlet of the fourth water tank is detected by the second temperature measuring instrument. And if the temperature of the wire rod at the outlet of the fourth water tank is detected to be higher than the second cooling target temperature of the wire rod, sequentially opening a plurality of water cooling nozzles of the fourth water tank in a reverse direction relative to the rolling direction. And stopping opening of the water-cooling nozzles remaining in the fourth water tank if it is detected that the temperature of the wire rod at the outlet of the fourth water tank is equal to or lower than the second cooling target temperature of the wire rod.
And if the temperature of the wire rod at the outlet of the fourth water tank is detected to be lower than the second cooling target temperature of the wire rod, the flow of the water-cooling nozzle which is started at the last time is adjusted to be small, so that the temperature of the wire rod at the outlet of the fourth water tank is detected to be within the range of the second cooling target temperature.
Furthermore, a first water-cooling nozzle, a second water-cooling nozzle, a third water-cooling nozzle, a fourth water-cooling nozzle, a fifth water-cooling nozzle, a sixth water-cooling nozzle, a seventh water-cooling nozzle and an eighth water-cooling nozzle are sequentially arranged in the third water tank along the rolling direction of the wire rod. And a third anti-flapping water nozzle and a third anti-flapping air purging pipe are also arranged at the downstream of the eighth water-cooling nozzle in the third water tank. And a first water-cooling nozzle, a second water-cooling nozzle, a third water-cooling nozzle, a fourth water-cooling nozzle, a fifth water-cooling nozzle, a sixth water-cooling nozzle, a seventh water-cooling nozzle and an eighth water-cooling nozzle are sequentially arranged in the fourth water tank along the rolling direction of the wire rod. And a fourth reverse-flapping water nozzle and a fourth reverse-flapping air purging pipe are also arranged at the downstream of the eighth water-cooling nozzle in the fourth water tank.
When the end of the wire rod runs to the eighth water-cooling nozzle of the third water tank, the eighth water-cooling nozzle, the seventh water-cooling nozzle, the sixth water-cooling nozzle, the fifth water-cooling nozzle, the fourth water-cooling nozzle, the third water-cooling nozzle, the second water-cooling nozzle and the first water-cooling nozzle of the third water tank are sequentially opened, the wire rod is cooled through the third water tank, and then passes through the third water-back water-spraying nozzle and the third air-back blowing-pipe in the third water tank (wherein, when the third water tank works, the third water-back water-spraying nozzle and the third air-back blowing-pipe in the third water tank are always opened), and third water-back and third air-back processing are carried out on the wire rod. And then when the end of the wire rod runs to an eighth water-cooling nozzle of a fourth water tank, sequentially starting an eighth water-cooling nozzle, a seventh water-cooling nozzle, a sixth water-cooling nozzle, a fifth water-cooling nozzle, a fourth water-cooling nozzle, a third water-cooling nozzle, a second water-cooling nozzle and a first water-cooling nozzle of the fourth water tank, cooling the wire rod through the fourth water tank, and then carrying out fourth-time reverse water spraying and fourth-time reverse gas spraying treatment on the wire rod through a fourth reverse water spraying nozzle and a fourth reverse gas spraying purging pipe in the fourth water tank (wherein, the fourth water tank works, the fourth reverse water spraying nozzle and the fourth reverse gas spraying purging pipe in the fourth water tank are always opened).
After finish rolling of a wire rod (the specification of the wire rod is less than 12.5mm), cooling the wire rod, reversely opening a plurality of water-cooling nozzles of a third water tank, and then performing third-time backwashing water and third-time backwashing gas treatment on the wire rod; and reversely opening a plurality of water-cooling nozzles of the fourth water tank, and then carrying out fourth water and gas counterattack treatment on the wire rod. Can make the wire rod cool off fast, reduce the high temperature section time, get rid of the moisture on wire rod surface, guarantee not ponding on the surface of wire rod in wire rod cooling process, can reduce the wire rod surface and take place oxidation reaction, reduce the metal oxide that the wire rod surface produced, make metal oxide's thickness reduce to reduce the defect that the wire rod surface produced, make the surface of wire rod more smooth.
In the embodiment of the application, the plurality of water cooling nozzles in the fourth water tank are not necessarily all opened, and the outlet of the fourth water tank is provided with a second temperature measuring instrument for detecting the temperature of the wire rod, the wire rod after passing through the third water tank and the fourth water tank has a second cooling target temperature, the second temperature measuring instrument can measure the real-time temperature of the wire rod after being cooled through the third water tank and the fourth water tank, and if the real-time temperature is within the range of the second cooling target temperature, the wire rod meets the cooling requirement.
For example: after the eight water-cooling nozzles in the third water tank are all opened in sequence, if the temperature of the wire rod at the outlet of the fourth water tank is higher than the second cooling target temperature of the wire rod, the eighth water-cooling nozzle of the fourth water tank is continuously opened; and if the temperature of the wire rod at the outlet of the fourth water tank is detected to be higher than the second cooling target temperature of the wire rod again by the second temperature detector, continuously opening the seventh water-cooling nozzle of the fourth water tank, and repeating the steps until the temperature of the wire rod at the outlet of the fourth water tank is within the range of the second cooling target temperature.
In other embodiments, if it is detected that the temperature of the wire rod at the outlet of the fourth water tank is higher than the second cooling target temperature of the wire rod, the eighth water-cooling nozzle of the fourth water tank is turned on; and if the temperature of the wire rod at the outlet of the fourth water tank is detected to be lower than the second cooling target temperature of the wire rod again, the flow of the eighth water-cooling nozzle of the fourth water tank is reduced, so that the detected temperature of the wire rod at the outlet of the fourth water tank is in the range of the second cooling target temperature. Of course, the flow rates of the other water cooling nozzles of the fourth water tank may also be adjusted according to the cooling demand of the wire rod until the temperature of the wire rod at the outlet of the fourth water tank is within the range of the second cooling target temperature.
The number of the water-cooling nozzles of the fourth water tank can be adjusted, the flow of the water-cooling nozzles of the fourth water tank can be adjusted, so that the wire rods with different specifications can be cooled to the corresponding second cooling target temperature, and pitted surface defects of different wire rods can be improved. Of course, the water cooling nozzles in the fourth water tank may also be turned on in reverse order completely for the cooling requirements of the wire rod.
And (3) after the wire rod is subjected to pre-finish rolling, primary cooling, finish rolling and secondary cooling (the finish rolling and the secondary cooling process are optional, and the second type of wire rod needs to be subjected to finish rolling and the secondary cooling process), reducing and sizing rolling, and then carrying out tertiary cooling through a fifth water tank. And when the end of the wire rod passes through the water-cooling nozzles at the outlet of the fifth water tank, the plurality of water-cooling nozzles of the fifth water tank are sequentially opened in a reverse direction relative to the rolling direction of the wire rod.
Furthermore, the fifth water tank is sequentially provided with a first water-cooling nozzle, a second water-cooling nozzle, a third water-cooling nozzle, a fourth water-cooling nozzle, a fifth water-cooling nozzle, a sixth water-cooling nozzle, a seventh water-cooling nozzle and an eighth water-cooling nozzle along the rolling direction of the wire rod. And in the fifth water tank, a fifth anti-flutter water spray nozzle and a fifth anti-flutter air purging pipe are further arranged at the downstream of the eighth water-cooling nozzle.
When the end of the wire rod runs to the eighth water-cooling nozzle of the fifth water tank, the eighth water-cooling nozzle, the seventh water-cooling nozzle, the sixth water-cooling nozzle, the fifth water-cooling nozzle, the fourth water-cooling nozzle, the third water-cooling nozzle, the second water-cooling nozzle and the first water-cooling nozzle of the fifth water tank are sequentially opened, the wire rod is cooled through the fifth water tank, and then passes through the fifth water-backwashing nozzle and the fifth air-backwashing purging pipe in the fifth water tank (wherein, the fifth water tank works, the fifth water-backwashing nozzle and the fifth air-purging pipe in the fifth water tank are always opened), and the fifth water-backwashing and the fifth air-backwashing treatment are carried out on the wire rod.
In the embodiment of the application, the water spraying pressure of the first water tank, the second water tank, the third water tank, the fourth water tank and the fifth water tank is not less than 350 KPa. In the process of cooling the wire rod, the wire rod is cooled by adopting larger water pressure, so that the uniformity of the temperature on the surface of the wire rod is better, and the phenomena of water spraying, water soaking and the like are avoided.
It should be noted that each water-cooling nozzle in the first water tank, the first anti-flutter water nozzle and the first anti-flutter gas purging pipe in the first water tank, each water-cooling nozzle in the second water tank, the second anti-flutter water nozzle and the second anti-flutter gas purging pipe in the second water tank, each water-cooling nozzle in the third water tank, the third anti-flutter water nozzle and the third anti-flutter gas purging pipe in the third water tank, each water-cooling nozzle in the fourth water tank, the fourth anti-flutter water nozzle and the fourth anti-flutter gas purging pipe in the fourth water tank, each water-cooling nozzle in the fifth water tank, the fifth anti-flutter water nozzle and the fifth anti-flutter gas purging pipe in the fifth water tank correspond to a valve for controlling the opening of the valve, and the opening of the valve is opened correspondingly; the adjustment of the flow rate of the water-cooling nozzle is to control the opening degree of a valve corresponding to the water-cooling nozzle.
Example 1
In this example, the wire rod is a 1215MS grade wire rod with a gauge of 18 mm. The wire rod rolling device sequentially passes through a heating device, a high-pressure water descaling device, a rough rolling device, a middle rolling device, a pre-finish rolling device, a first water tank, a second water tank, a finish rolling device, a third water tank, a fourth water tank, a reducing and sizing device, a fifth water tank, a spinning device, a stelmor cooling control device, a coil collecting device and a PF line cooling device along the rolling direction of the wire rod. Wherein, the finish rolling device is empty, the third water tank and the fourth water tank do not work, the wire rod which is subjected to pre-finish rolling and is subjected to primary cooling through the first water tank and the second water tank obtains a wire rod with a first cooling target temperature of 1215MS mark and a specification of 18mm, and the wire rod enters the cooling target temperature of the reducing and sizing device, which is 900 plus 920 ℃.
The first water-cooling nozzle, the second water-cooling nozzle, the third water-cooling nozzle, the fourth water-cooling nozzle, the fifth water-cooling nozzle and the sixth water-cooling nozzle are sequentially arranged in the first water tank along the rolling direction, and the first water-cooling nozzle, the second water-cooling nozzle, the third water-cooling nozzle, the fourth water-cooling nozzle, the fifth water-cooling nozzle, the sixth water-cooling nozzle, the seventh water-cooling nozzle and the eighth water-cooling nozzle are sequentially arranged in the second water tank along the rolling direction. And when the head of the wire rod passes through the eighth water-cooling nozzle of the second water tank, the eighth water-cooling nozzle and the seventh water-cooling nozzle of the second water tank are sequentially opened. The temperature at the outlet of the second water tank was detected by the first thermometer to be 910 c, which was within the range of the first cooling target temperature.
Comparative example 1
Comparative example 1 differs from example 1 in that: and when the end of the wire rod passes through the eighth water-cooling nozzle of the second water tank, the first water-cooling nozzle and the second water-cooling nozzle of the second water tank are sequentially opened. The temperature at the outlet of the second water tank was detected by the first thermometer to be 908 deg.c, which was within the range of the first cooling target temperature.
Comparative example 2
Comparative example 2 differs from example 1 in that: and when the end of the wire rod passes through the eighth water-cooling nozzle of the second water tank, opening the eighth water-cooling nozzle, the seventh water-cooling nozzle, the sixth water-cooling nozzle, the fifth water-cooling nozzle, the fourth water-cooling nozzle, the third water-cooling nozzle, the second water-cooling nozzle and the first water-cooling nozzle of the second water tank in sequence, and then opening the sixth water-cooling nozzle of the first water tank. The temperature at the outlet of the second water tank was detected to be 900 ℃ by the first thermometer to be within the range of the first cooling target temperature.
Experimental example 1
A photograph was taken of the wire rod provided in example 1; the wire rod provided in comparative example 1 was photographed; the wire rod provided in comparative example 2 was photographed. Wherein, fig. 1A is a photograph of the wire rod provided in example 1; fig. 1B is a photograph of the wire rod provided in comparative example 1, and fig. 1C is a photograph of the wire rod provided in comparative example 2. As can be seen by comparing fig. 1A, 1B and 1C, the surface of the wire rod provided in example 1 is smooth, the pitted defect exists in the surface of the wire rod provided in comparative example 2, and the pitted defect exists in the surface of the wire rod provided in comparative example 1. Therefore, when the wire rod is a 1215MS wire rod with the specification of 18mm, the plurality of water-cooling nozzles of the first water tank are reversely opened first and then the plurality of water-cooling nozzles of the second water tank are reversely opened when the wire rod provided by the embodiment of the application is cooled, so that the pitted surface of the wire rod can be obviously improved.
Example 2
In this example, the wire rod is 1215MS grade wire rod with a specification of 9 mm. The wire rod sequentially passes through a heating device, a high-pressure water descaling device, a rough rolling device, a middle rolling device, a pre-finish rolling device, a first water tank, a second water tank, a finish rolling device, a third water tank, a fourth water tank, a reducing and sizing device, a fifth water tank, a spinning device, a stelmor cooling control device, a coil collecting device and a PF line cooling device. After the wire rod is subjected to pre-finish rolling and rolling, the wire rod with the first cooling target temperature of 1215MS mark and the specification of 9mm obtained after the first cooling is carried out through the first water tank and the second water tank enters a cooling target temperature of 920-940 ℃ in a finish rolling device. After the wire rod is subjected to finish rolling, the wire rod with the second cooling target temperature of 1215MS mark and the specification of 9mm obtained after the wire rod is subjected to secondary cooling through a third water tank and a fourth water tank enters the cooling target temperature of 910-plus 930 ℃ in the reducing and sizing device.
The first water-cooling nozzle, the second water-cooling nozzle, the third water-cooling nozzle, the fourth water-cooling nozzle, the fifth water-cooling nozzle and the sixth water-cooling nozzle are sequentially arranged in the first water tank along the rolling direction, and the first water-cooling nozzle, the second water-cooling nozzle, the third water-cooling nozzle, the fourth water-cooling nozzle, the fifth water-cooling nozzle, the sixth water-cooling nozzle, the seventh water-cooling nozzle and the eighth water-cooling nozzle are sequentially arranged in the second water tank along the rolling direction. And when the end of the wire rod passes through the sixth water-cooling nozzle of the first water tank, sequentially opening the sixth water-cooling nozzle, the fifth water-cooling nozzle, the fourth water-cooling nozzle, the third water-cooling nozzle, the second water-cooling nozzle and the first water-cooling nozzle of the first water tank, and then when the end of the wire rod passes through the eighth water-cooling nozzle of the second water tank, sequentially opening the eighth water-cooling nozzle and the seventh water-cooling nozzle of the second water tank. The temperature at the outlet of the second water tank, which was detected by the first thermometer, was 923 deg.c, which was within the range of the first cooling target temperature.
The first water-cooling nozzle, the second water-cooling nozzle, the third water-cooling nozzle, the fourth water-cooling nozzle, the fifth water-cooling nozzle, the sixth water-cooling nozzle, the seventh water-cooling nozzle and the eighth water-cooling nozzle are sequentially arranged in the third water tank along the rolling direction, and the first water-cooling nozzle, the second water-cooling nozzle, the third water-cooling nozzle, the fourth water-cooling nozzle, the fifth water-cooling nozzle, the sixth water-cooling nozzle, the seventh water-cooling nozzle and the eighth water-cooling nozzle are sequentially arranged in the fourth water tank along the rolling direction. And when the end of the wire rod passes through the eighth water-cooling nozzle of the third water tank, sequentially opening the eighth water-cooling nozzle, the seventh water-cooling nozzle, the sixth water-cooling nozzle, the fifth water-cooling nozzle, the fourth water-cooling nozzle, the third water-cooling nozzle, the second water-cooling nozzle and the first water-cooling nozzle of the third water tank, and then when the end of the wire rod passes through the eighth water-cooling nozzle of the fourth water tank, sequentially opening the eighth water-cooling nozzle, the seventh water-cooling nozzle and the sixth water-cooling nozzle of the fourth water tank. The temperature at the outlet of the fourth water tank was detected to be 912 deg.c by the second thermometer and was within the range of the second cooling target temperature.
Comparative example 3
Comparative example 3 differs from example 2 in that: and when the end of the wire rod passes through the sixth water-cooling nozzle of the first water tank, sequentially opening the first water-cooling nozzle, the second water-cooling nozzle, the third water-cooling nozzle, the fourth water-cooling nozzle, the fifth water-cooling nozzle and the sixth water-cooling nozzle of the first water tank, and then when the end of the wire rod passes through the eighth water-cooling nozzle of the second water tank, sequentially opening the first water-cooling nozzle and the second water-cooling nozzle of the second water tank. The temperature at the outlet of the second water tank detected by the first thermometer was 914 deg.c, which was within the range of the first cooling target temperature.
And when the end of the wire rod passes through the eighth water-cooling nozzle of the third water tank, sequentially opening the first water-cooling nozzle, the second water-cooling nozzle, the third water-cooling nozzle, the fourth water-cooling nozzle, the fifth water-cooling nozzle, the sixth water-cooling nozzle, the seventh water-cooling nozzle and the eighth water-cooling nozzle of the third water tank, and then when the end of the wire rod passes through the eighth water-cooling nozzle of the fourth water tank, sequentially opening the first water-cooling nozzle, the second water-cooling nozzle and the third water-cooling nozzle of the fourth water tank. The temperature at the outlet of the fourth water tank, which is detected by the second thermometer, is 905 deg.c, which is within the range of the second cooling target temperature.
Comparative example 4
Comparative example 4 differs from example 2 in that: and when the end of the wire rod passes through the eighth water-cooling nozzle of the second water tank, sequentially opening the eighth water-cooling nozzle, the seventh water-cooling nozzle, the sixth water-cooling nozzle, the fifth water-cooling nozzle, the fourth water-cooling nozzle, the third water-cooling nozzle, the second water-cooling nozzle and the first water-cooling nozzle of the second water tank, and then sequentially opening the sixth water-cooling nozzle and the fifth water-cooling nozzle of the first water tank. The temperature at the outlet of the second water tank was 916 ℃ detected by the first temperature detector and was within the range of the first cooling target temperature.
And when the end of the wire rod passes through the eighth water-cooling nozzle of the fourth water tank, opening the eighth water-cooling nozzle, the seventh water-cooling nozzle, the sixth water-cooling nozzle, the fifth water-cooling nozzle, the fourth water-cooling nozzle, the third water-cooling nozzle, the second water-cooling nozzle and the first water-cooling nozzle of the fourth water tank in sequence, and then opening the eighth water-cooling nozzle, the seventh water-cooling nozzle and the sixth water-cooling nozzle of the third water tank in sequence. The temperature at the outlet of the fourth water tank was 911 c, which was detected by the second thermometer, and was within the range of the second cooling target temperature.
Experimental example 2
A photograph was taken of the wire rod provided in example 2; the wire rod provided in comparative example 3 was photographed; the wire rod provided in comparative example 4 was photographed. Wherein, fig. 2A is a photograph of the wire rod provided in example 2; fig. 2B is a photograph of the wire rod provided in comparative example 3; fig. 2C is a photograph of the wire rod provided in comparative example 4. As can be seen by comparing fig. 2A, fig. 2B and fig. 2C, the surface of the wire rod provided in example 2 was smooth, the pitted defect was present in the surface of the wire rod provided in comparative example 4, and the pitted defect was present in the surface of the wire rod provided in comparative example 3. Therefore, when the wire rod is a wire rod with the specification of 1215MS mark and the diameter of 9mm, when the wire rod provided by the embodiment of the application is cooled, the plurality of water-cooling nozzles of the first water tank are reversely opened, the plurality of water-cooling nozzles of the second water tank are reversely opened, the plurality of water-cooling nozzles of the third water tank are reversely opened, and the plurality of water-cooling nozzles of the fourth water tank are reversely opened, so that the pitted surface of the wire rod can be obviously improved.
The embodiments described above are some, but not all embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.

Claims (10)

1. A control method of surface defects of a wire rod is suitable for a wire rod processing production line and is characterized in that the wire rod processing production line comprises a pre-finish rolling device, a first water tank and a second water tank which are sequentially arranged, and the wire rod can sequentially pass through the pre-finish rolling device, the first water tank and the second water tank along a rolling direction; the first water tank and the second water tank respectively comprise a plurality of water cooling nozzles which are sequentially arranged along the rolling direction;
the control method comprises the following steps:
when the end of the wire rod passes through the water-cooling nozzles at the outlet of the first water tank, all the plurality of water-cooling nozzles of the first water tank are sequentially opened in a reverse direction relative to the rolling direction, and then when the end of the wire rod passes through the water-cooling nozzles at the outlet of the second water tank, at least one of the plurality of water-cooling nozzles of the second water tank is sequentially opened in a reverse direction relative to the rolling direction.
2. The control method according to claim 1, characterized by further comprising:
detecting the temperature of the wire rod at the outlet of the second water tank after the plurality of water-cooling nozzles of the first water tank are all opened;
if the temperature of the wire rod at the outlet of the second water tank is higher than the first cooling target temperature of the wire rod, the plurality of water cooling nozzles of the second water tank are sequentially started in a reverse direction relative to the rolling direction;
and if the temperature of the wire rod at the outlet of the second water tank is detected to be equal to or lower than the first cooling target temperature of the wire rod, stopping starting the water cooling nozzles remained in the second water tank.
3. The control method according to claim 2, wherein if it is detected that the temperature of the wire rod at the outlet of the second water tank is lower than a first cooling target temperature of the wire rod, the flow rate of the water-cooling nozzle that was turned on most recently is adjusted to be small so that the temperature of the wire rod at the outlet of the second water tank is detected to be within the range of the first cooling target temperature.
4. The control method according to claim 3, wherein a first water-cooling nozzle, a second water-cooling nozzle, a third water-cooling nozzle, a fourth water-cooling nozzle, a fifth water-cooling nozzle and a sixth water-cooling nozzle are sequentially arranged in the first water tank along the rolling direction, and a first water-cooling nozzle, a second water-cooling nozzle, a third water-cooling nozzle, a fourth water-cooling nozzle, a fifth water-cooling nozzle, a sixth water-cooling nozzle, a seventh water-cooling nozzle and an eighth water-cooling nozzle are sequentially arranged in the second water tank along the rolling direction;
the control method comprises the following steps:
if the temperature of the wire rod at the outlet of the second water tank is detected to be higher than the first cooling target temperature of the wire rod, starting an eighth water-cooling nozzle of the second water tank; detecting again to obtain that the temperature of the wire rod at the outlet of the second water tank is higher than the first cooling target temperature of the wire rod, continuing to open a seventh water cooling nozzle of the second water tank, and repeating the steps until the temperature of the wire rod at the outlet of the second water tank is within the range of the first cooling target temperature;
if the temperature of the wire rod at the outlet of the second water tank is detected to be higher than the first cooling target temperature of the wire rod, starting an eighth water-cooling nozzle of the second water tank; and if the temperature of the wire rod at the outlet of the second water tank is detected to be lower than the first cooling target temperature of the wire rod again, adjusting the flow of an eighth water-cooling nozzle of the second water tank to be small, so that the detected temperature of the wire rod at the outlet of the second water tank is within the range of the first cooling target temperature.
5. The control method according to any one of claims 1 to 4, wherein the wire rod processing line further includes a finish rolling device, a third water tank, and a fourth water tank which are located downstream of the second water tank and are arranged in this order in the rolling direction, and the wire rod is capable of passing through the pre-finish rolling device, the first water tank, the second water tank, the finish rolling device, the third water tank, and the fourth water tank in this order in the rolling direction; the third water tank and the fourth water tank respectively comprise a plurality of water cooling nozzles which are sequentially arranged along the rolling direction;
the control method further comprises the following steps:
if the specification of the wire rod is less than 12.5mm, when the end of the wire rod passes through the water cooling nozzles at the outlet of the third water tank, sequentially opening all the water cooling nozzles of the third water tank in a reverse direction relative to the rolling direction, and then when the end of the wire rod passes through the water cooling nozzles at the outlet of the fourth water tank, sequentially opening at least one of the water cooling nozzles of the fourth water tank in a reverse direction relative to the rolling direction;
and if the specification of the wire rod is greater than or equal to 12.5mm, the finish rolling device is empty, and the plurality of water cooling nozzles of the third water tank and the fourth water tank are in a closed state.
6. The control method according to claim 5, characterized by further comprising:
detecting the temperature of the wire rod at the outlet of the fourth water tank after the plurality of water-cooling nozzles of the third water tank are all opened;
if the detected temperature of the wire rod at the outlet of the fourth water tank is higher than a second cooling target temperature of the wire rod, sequentially opening a plurality of water cooling nozzles of the fourth water tank in a reverse direction relative to the rolling direction;
and if the temperature of the wire rod at the outlet of the fourth water tank is detected to be equal to or lower than the second cooling target temperature of the wire rod, stopping starting the water cooling nozzles remained in the fourth water tank.
7. The control method according to claim 6, wherein if it is detected that the temperature of the wire rod at the outlet of the fourth water tank is lower than a second cooling target temperature of the wire rod, the flow rate of the water-cooling nozzle that was turned on most recently is adjusted to be small so that the temperature of the wire rod at the outlet of the fourth water tank is detected to be within the range of the second cooling target temperature.
8. The control method according to claim 7, wherein a first water-cooling nozzle, a second water-cooling nozzle, a third water-cooling nozzle, a fourth water-cooling nozzle, a fifth water-cooling nozzle, a sixth water-cooling nozzle, a seventh water-cooling nozzle and an eighth water-cooling nozzle are sequentially arranged in the third water tank along the rolling direction, and a first water-cooling nozzle, a second water-cooling nozzle, a third water-cooling nozzle, a fourth water-cooling nozzle, a fifth water-cooling nozzle, a sixth water-cooling nozzle, a seventh water-cooling nozzle and an eighth water-cooling nozzle are sequentially arranged in the fourth water tank along the rolling direction;
the control method comprises the following steps:
if the temperature of the wire rod at the outlet of the fourth water tank is detected to be higher than a second cooling target temperature of the wire rod, starting an eighth water-cooling nozzle of the fourth water tank; detecting again to obtain that the temperature of the wire rod at the outlet of the fourth water tank is higher than a second cooling target temperature of the wire rod, continuing to start a seventh water cooling nozzle of the fourth water tank, and repeating the steps until the temperature of the wire rod at the outlet of the fourth water tank is within the range of the second cooling target temperature;
if the temperature of the wire rod at the outlet of the fourth water tank is detected to be higher than a second cooling target temperature of the wire rod, starting an eighth water-cooling nozzle of the fourth water tank; and if the temperature of the wire rod at the outlet of the fourth water tank is detected to be lower than a second cooling target temperature of the wire rod again, adjusting the flow of an eighth water-cooling nozzle of the fourth water tank to be small, so that the detected temperature of the wire rod at the outlet of the fourth water tank is within the range of the second cooling target temperature.
9. The control method according to claim 5, wherein the wire rod processing line further comprises a reducing and sizing device, a fifth water tank and a laying device which are positioned downstream of the fourth water tank and are arranged in sequence in the rolling direction, and the wire rod can pass through the pre-finishing rolling device, the first water tank, the second water tank, the finishing rolling device, the third water tank, the fourth water tank, the reducing and sizing device, the fifth water tank and the laying device in sequence in the rolling direction; the fifth water tank comprises a plurality of water-cooling nozzles which are sequentially arranged along the rolling direction;
and when the end of the wire rod passes through the water-cooling nozzles at the outlet of the fifth water tank, the plurality of water-cooling nozzles in the fifth water tank are sequentially opened in a reverse direction relative to the rolling direction.
10. The control method according to claim 9, wherein the water pressure of the water spray from the first water tank, the second water tank, the third water tank, the fourth water tank, and the fifth water tank is not less than 350 KPa.
CN201911064698.2A 2019-11-01 2019-11-01 Control method for surface defects of wire rod Active CN110773575B (en)

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CN111363968A (en) * 2020-04-03 2020-07-03 阳春新钢铁有限责任公司 HPB300 steel and production method for improving surface scab of HPB300 steel
CN112958620A (en) * 2021-02-03 2021-06-15 广东韶钢松山股份有限公司 Control method and control equipment of water cooling system and water cooling control system

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