CN113059005B - Bar controlled rolling and cooling device and process - Google Patents
Bar controlled rolling and cooling device and process Download PDFInfo
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- CN113059005B CN113059005B CN202110327942.0A CN202110327942A CN113059005B CN 113059005 B CN113059005 B CN 113059005B CN 202110327942 A CN202110327942 A CN 202110327942A CN 113059005 B CN113059005 B CN 113059005B
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- 238000001816 cooling Methods 0.000 title claims abstract description 79
- 238000005096 rolling process Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000008569 process Effects 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 238000010583 slow cooling Methods 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 230000011218 segmentation Effects 0.000 claims description 10
- 239000000498 cooling water Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 description 31
- 229910000831 Steel Inorganic materials 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 7
- 229910000734 martensite Inorganic materials 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
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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
- 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
-
- 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
-
- 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
- B21B2045/0212—Cooling devices, e.g. using gaseous coolants using gaseous coolants
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a bar controlled rolling and cooling device and a bar controlled rolling and cooling process, wherein a heating furnace, a roughing mill set, a first flying shear, a middle mill set, a pre-water-through cooling section, a second flying shear, a finishing mill set, a main water-through cooling section, a third flying shear and a cooling bed are sequentially arranged along a rolling direction of the device; the main water-through cooling section comprises a water tank body, wherein an inlet guider, a cooler, a slow cooling pipe group and an outlet guider are sequentially arranged in the water tank body according to the rolling direction, the water tank body is provided with a closed shell, and the bottom of the water tank body is provided with a water and gas discharge port; the temperature measuring instrument is arranged at the outlet of the main water-through cooling section, and a measured temperature signal is fed back to the main water-through cooling section to adjust the cooling technological parameters of the main water-through cooling section and ensure that the bar meets the temperature requirement of entering the cooling bed.
Description
Technical Field
The invention relates to the field of steel production and processing, in particular to a bar controlled rolling and cooling process device.
Background
Because of the requirements on the metallographic structure of the bar in the new national standard GB/T1499.2-2018, the temperature requirements on online controlled rolling and controlled cooling are higher, if the temperature is too high, the mechanical property of the product can not meet the requirements, the mechanical property can only be improved by adding alloy, the production cost is increased, and if the temperature is too low, the base circle can easily generate martensite, so that the product can not meet the requirements of the new national standard, and the temperature for cooling the surface of the steel bar needs to be accurately controlled. The original equipment is easy to generate a large amount of fog in the cooling process, and especially the whole fog in a cooling control area is diffused, so that the temperature measurement is inaccurate, and the visual detection cannot be realized, so that the accurate temperature control and the disadvantage thereof are difficult to realize.
The conventional bar production line consists of single cutting, two cutting, three cutting and four cutting, and a few of the bar production lines are five-cutting growth lines. Because of the influence of the field environment, the original process only detects the temperature of the cooling bed on the finished product generally, the cooling temperature is not accurately controlled in the cooling control process, and tempered martensite is easily generated on the surface of the steel bar.
Disclosure of Invention
The invention aims to provide a bar rolling and cooling control device and a bar rolling and cooling control process, which ensure that the quality of bars reaches the standard through the accurate control of a cooling mode and temperature.
According to a first aspect of the invention, a bar rolling and cooling control device is provided, wherein a heating furnace, a rough rolling unit, a first flying shear, a middle rolling unit, a pre-water-through cooling section, a second flying shear, a finishing rolling unit, a main water-through cooling section, a third flying shear and a cooling bed are arranged in sequence along a rolling direction;
the main water-through cooling section comprises a water tank body, wherein an inlet guider, a cooler, a slow cooling pipe group and an outlet guider are sequentially arranged in the water tank body according to the rolling direction, the water tank body is provided with a closed shell, the bottom of the closed shell is provided with a water and gas discharge port, and a cooling water inlet quick connector and a compressed air inlet quick connector are arranged on the shell;
the temperature measuring instrument is arranged at the outlet of the main water-through cooling section, and a measured temperature signal is fed back to the main water-through cooling section to adjust the cooling technological parameters of the main water-through cooling section and ensure that the bar meets the temperature requirement of entering the cooling bed.
Preferably, the slow cooling pipe group comprises a plurality of air ejectors coaxially arranged along a straight line at intervals, each air ejector comprises an air ejecting base, a cavity is arranged in each air ejecting base, an air inlet pipeline is arranged at the upper part of each air ejecting base, the left side of each air ejecting base is connected with the front guide piece, and the right side of each air ejecting base is connected with the rear guide piece; the front guide piece and the rear guide piece are provided with transverse channels for the bars to pass through, the front end of the front guide piece and the rear end of the rear guide piece are butted in the cavity of the air injection base, annular air injection holes penetrating through the transverse channels are arranged on the peripheral wall of the front guide piece or the rear guide piece in the cavity, or air injection circular seams are formed by butting the front end of the front guide piece and the rear end of the rear guide piece.
Preferably, a multi-point temperature measuring instrument is arranged at an outlet of the main water cooling section, the multi-point temperature measuring instrument comprises a rack, an upper row and a lower row of temperature measuring instruments are arranged on the rack, two movable temperature measuring instruments are arranged on the upper row, and a first temperature measuring instrument and a second temperature measuring instrument are respectively arranged from left to right; three fixed thermometers are arranged on the lower row, and a third thermometer, a fourth thermometer and a fifth thermometer are respectively arranged from left to right;
the device comprises a first temperature measuring instrument, a second temperature measuring instrument, a third temperature measuring instrument, a fourth temperature measuring instrument, a third temperature measuring instrument and a fifth temperature measuring instrument, wherein a temperature measuring point of the fourth temperature measuring instrument is opposite to a rolling central line, the fourth temperature measuring instrument is used for detecting the temperature of a splitting line between single splitting and three splitting, and the third temperature measuring instrument and the fifth temperature measuring instrument are used for detecting the temperatures of two splitting lines outside the four splitting; the first temperature measuring instrument and the second temperature measuring instrument are used for detecting the temperatures of the two segmentation lines outside the two segmentations and the three segmentation lines and the two segmentation lines in the middle of the four segmentations.
Preferably, the movable temperature measuring instrument is matched with a slide rail on the sliding table through the movable sliding seat, and is driven by the stepping motor and the screw rod, so that the screw rod for driving the first temperature measuring instrument and the screw rod for driving the second temperature measuring instrument are positioned on the same axis but are arranged in opposite spiral directions and are driven by the same stepping motor.
According to a second aspect of the invention, a controlled rolling and cooling process for bars is provided, which comprises the following steps:
(1) providing a bar controlled rolling and cooling device according to the first aspect of the invention;
(2) heating a steel material to be rolled to a rolling temperature by a heating furnace, and enabling the steel material to sequentially pass through a roughing mill group, a middle mill group, a pre-water-through cooling section, a finishing mill group, a main water-through cooling section and a cooling bed by a conveying roller way;
(3) and feeding back a temperature signal measured by a temperature measuring instrument at the outlet of the main through water cooling section to the main through water cooling section for adjusting the cooling process parameters of the main through water cooling section and ensuring that the bar meets the temperature requirement of entering the cooling bed.
Preferably, the plurality of air sprayers in the slow cooling pipe group in the main water-passing cooling section are divided into two groups according to the front and back direction, the first group is used for spraying nitrogen, and the second group is used for spraying air or oxygen; the bar after being rolled and penetrated with water passes through the transverse channel of each air injector from left to right, the first group of air injectors are used for drying the residual water on the surface of the bar, and the second group of air injectors are used for oxidizing the surface of the dried bar to form an oxidation film.
In the specific case, the initial rolling temperature: 1020 ℃ to 1050 ℃; finish rolling inlet temperature: 900 ℃ and 960 ℃; the finishing temperature is as follows: 900 ℃ and 1000 ℃.
According to the bar rolling and cooling control device and the bar rolling and cooling control process, the temperature of the lowest cooling point on the surface of the steel bar can be accurately controlled, so that the phase transformation starting points of bainite and martensite at the edge part are reduced, the ferrite grain size at the center part of the steel bar is controlled in a refining manner, the martensite is not generated on the surface of a base circle, the microhardness difference of the center surface is not more than 40Hv, and the optimal matching of high quality and low cost of products is realized; meanwhile, the actual use condition of the field device and the convenience and the practicability of the field device replacement are considered, the combined equipment of the water tank and the controlled rolling and controlled cooling device is developed, the combined equipment has the advantages of simplicity and convenience in installation, the cooler can be replaced offline according to different specifications in production, and the like, meanwhile, the water tank can prevent the generation of fog in the cooling process, and the online temperature measurement accuracy is ensured.
Drawings
Fig. 1 is an overall schematic view of a bar controlled rolling and cooling device according to the present invention.
FIG. 2 is a schematic front view of the main water-passing cooling segment of the present invention.
FIG. 3 is a schematic top view of the main pass-water cooling panel of the present invention.
Fig. 4 is a schematic structural view of the water inlet nozzle of the cooler shown in fig. 2.
FIG. 5 is a schematic cross-sectional view of the air sparger of the present invention.
Fig. 6 is a schematic front view of the multipoint thermometer of the present invention.
Fig. 7 is a schematic sectional view taken along the direction B-B in fig. 6.
Fig. 8 is a schematic sectional view taken along the direction C-C in fig. 6.
Fig. 9 is a schematic sectional view taken along the direction D-D in fig. 6.
Detailed Description
The following describes the embodiments of the bar controlled rolling and cooling device and process of the present invention in detail with reference to the accompanying drawings. It should be understood by those skilled in the art that the embodiments described below are only illustrative of the present invention and are not intended to limit it in any way.
Referring to fig. 1, according to the rolling and cooling control device for metal bars of the present invention, a heating furnace 1, a roughing mill set 2, a first flying shear 3, a middle mill set 4, a pre-water cooling section 6, a second flying shear 7, a finishing mill set 8, a main water cooling section 9, a third flying shear 11 and a cooling bed 12 are sequentially arranged along a rolling direction (arrow direction in the figure).
Referring to fig. 2-3, the main water cooling section 9 includes a water tank body 20, and an inlet guide 21, a cooler 22, a slow cooling tube group 23 and an outlet guide 25 are sequentially arranged in the water tank body 20 according to a rolling direction, wherein the water tank body 20 has a closed housing, a water and gas discharge port is provided at the bottom, and a cooling water inlet quick coupling 26 and a compressed air inlet quick coupling 27 are provided on the housing. The water tank body 20 can be internally provided with single-cutting, two-cutting, three-cutting and/or four-cutting cold control equipment in parallel according to production requirements.
The water inlet of the cooler 22 is connected with a cooling water inlet quick coupling 26 on the shell through a metal hose, and the air inlet of the slow cooling pipe group 23 is connected with a compressed air inlet quick coupling 27 on the shell through a metal hose.
The cooler 22 is comprised of a water inlet section 221, a turbulence tube 222, and a water outlet section 223. Referring to fig. 4, the water inlet section 221 adopts a spiral nozzle 225, a front end 2251 of the spiral nozzle 225 is conical, and a spiral annular gap 2252 is formed on the outer surface of the front end 2251. The forward end 2251 of spiral nozzle 225 interfaces with turbulence tube 222. During operation, cooling water enters the turbulence pipe 222 from the cooling water inlet 224 through the spiral annular gap 2252 of the spiral nozzle 225 in a tangential direction, and the rod enters the turbulence pipe 222 through the inner cavity of the spiral nozzle 225 in an axial direction.
The water outlet section 223 of the cooler 22 comprises a water discharging section and a water intercepting section, cooling water in the turbulent pipe 222 naturally drains through the water discharging section, the rod with surface water enters the water intercepting section, and the water intercepting section is coaxially provided with a water outlet guide 226 and a water intercepting nozzle 227 in the rolling direction. The water outlet compressed air inlet 228 is vertically arranged at the rear end of the water outlet guide 226 and is used for vertically cutting off water on the surface of the bar; the water-intercepting compressed air inlet 229 is connected with the water-intercepting nozzle 227 to intercept the water of the bar material circumferentially. Through the combination of vertical water interception and circumferential water interception, the water on the surface of the bar is efficiently removed.
Referring specifically to fig. 5, the slow cooling tube group 23 has a plurality of air jets 28 arranged in the rolling line direction. The air sparger 28 comprises an air sparging base 232, with a cavity 235 disposed in the air sparging base 232. An air inlet pipeline 234 is arranged at the upper part of the air injection base 232, and the air inlet pipeline 234 is communicated with the cavity 235. The left side of the air injection base is connected to the front guide 231, and the right side of the air injection base is connected to the rear guide 233. The front end of the front guide 231 and the rear end of the rear guide 233 are butted in a cavity 235 of the air spouting base 232.
The front guide 231 and the rear guide 233 are both hollow cylindrical structures, each having a transverse passage for the rod to pass through, with their central axes aligned. The lateral channel of the front guide 231 is divided into a left expanded port, a middle contracted section and a right expanded port, and the lateral channel of the rear guide 233 is divided into a left expanded port, a middle contracted section and a right expanded port. The right expanded port of the front guide 231 is butted against the left expanded port of the rear guide 233. The left and right expanded ports of the front guide 231 and the rear guide 233 are provided with expanded ports to guide the introduction and discharge of the bar material. The inner diameters of the middle constricted sections of the front guide 231 and the rear guide 233 are set to be equivalent to the diameter of the rod material, slightly larger than the diameter of the rod material.
The front guide 231 and the rear guide 233 are detachably fixed to the air injection base 232 by bolts via fixing portions, and form a closed cavity 235 after assembly. An annular air hole 234 penetrating the horizontal passage is provided in the peripheral wall of the right expansion port of the front guide 231. In other embodiments, an annular gas orifice may also be provided on the peripheral wall of the left expanded port of the rear guide 233. Further, in a preferred embodiment, the annular gas injection holes may be replaced by circular slits formed by abutting the front end of the front guide 231 and the rear end of the rear guide 233, thereby simplifying the manufacture of the front guide 231 and the rear guide 233. The right expanded port of the front guide 231 is butted with the left expanded port of the rear guide 233 to form an inner cavity with a convex middle portion, so that air can be blown out to both ends conveniently. The high-pressure gas can be uniformly sprayed on the whole outer surface of the passing bar through the annular gas spraying holes or the annular gas spraying seams.
In the preferred embodiment, the plurality of jets 28 in the same row may be divided into two groups in the forward and backward direction, the first group for injecting compressed nitrogen gas and the second group for injecting compressed air or oxygen gas. The bar after wearing the water with the steel rolling from a left side to the right side passes through every air jet 28's transverse channel, and first group air jet spouts compressed nitrogen gas to the bar for weather the remaining moisture in bar surface, thereby the effective quick water film of cleaing away the bar surface and forming. And the second group of air sprayers spray compressed air or oxygen to the bar, and the surface of the dried bar is oxidized to form an oxide film. Through the process treatment, the whole outer surface of the bar can be uniformly subjected to dewatering and oxidation treatment, so that the surface of steel is prevented from rusting, and the surface strength of the bar is increased.
In some cases, the cooling degree of the bar materials needs to be increased, the slow cooling pipe group 23 can be replaced by another group of coolers 22, so that a standby water catcher 24 is arranged at the tail end of the main water-through cooling section 9, and the water catcher 24 is coaxially provided with a water catcher guide 241 and a water catcher nozzle 242. The water capture compressed air inlet 243 is connected to the water capture nozzles 242 for capturing water circumferentially on the rod.
Both the water intercept nozzles 227 and the water capture nozzles 242 of the present invention described hereinabove may be of similar construction to the air jets 28 described hereinabove.
The outlet of the main water cooling section 9 of the metal bar controlled rolling and cooling process device is provided with a multi-point temperature measuring instrument 10. Referring to fig. 6-9, the multipoint thermometers 10 comprise a rack 101, two rows of upper thermometers and lower thermometers are arranged on the rack 101, two movable thermometers are arranged on the upper row, and a first thermometer 105 and a second thermometer 106 are arranged from left to right; three fixed thermometers are arranged on the lower row, namely a third thermometer 103, a fourth thermometer 102 and a fifth thermometer 104 from left to right.
The temperature measuring point of the fourth temperature measuring instrument 102 is opposite to the rolling center line 120, the fourth temperature measuring instrument 102 is used for detecting the temperature of the splitting line between the single splitting and the three splitting, and the third temperature measuring instrument 103 and the fifth temperature measuring instrument 104 are used for detecting the temperature of the two splitting lines 123 and 124 outside the four splitting; the first temperature detector 105 and the second temperature detector 106 are used for detecting the temperatures of the two split lines outside the two-split and three-split and the two split lines 121 and 122 in the middle of the four-split.
In a specific case, the fixed thermometer is fixed to the frame 101 by a fixed support 112. The movable temperature measuring instrument is matched with a slide rail on the sliding table 110 through a movable sliding seat 111, and is driven by a stepping motor 107 and a screw rod, a first screw rod 108 for driving a first temperature measuring instrument 105 and a second screw rod 109 for driving a second temperature measuring instrument 106 are positioned on the same axis, but are arranged in opposite spiral directions, and are driven by the same stepping motor 107. The center of the connecting line between the first temperature measuring instrument 105 and the second temperature measuring instrument 106 is located on the rolling center line 120, and the first temperature measuring instrument and the second temperature measuring instrument are driven by the stepping motor to be linked and can be close to or far away from each other, so that the positions can be adjusted according to the cutting number of the rolling production line, and the temperature detection device can be used for detecting the temperature of two cutting lines, the cutting line outside the three cutting lines and the temperature of two cutting lines in the middle of the four cutting lines. All thermometers adopt double-colorimetric infrared thermometers.
The general production line of a rod and wire manufacturer consists of single cutting, two cutting, three cutting and four cutting, and the multipoint thermodetector provided by the invention consists of three fixed thermodetectors and two movable thermodetectors, wherein the total number of the thermodetectors is 5. The fixed thermometers at the middle of the fixed thermometers are used for detecting the temperature of the cutting line between the single cutting and the three cutting, and the fixed thermometers at the two sides are used for detecting the temperature of the two cutting lines at the outer side of the four cutting; the movable temperature measuring instrument is used for detecting the temperatures of the two cutting lines outside the two cutting lines and the three cutting lines and the two cutting lines in the middle of the four cutting lines, the movable temperature measuring instrument is driven by a stepping motor according to the actual production requirement, the movable temperature measuring instrument is moved to a required position for measuring the temperature, then a real-time detection temperature signal is fed back to the PLC of the main water-through cooling section, and the PLC adjusts the water inflow of cooling water according to the real-time temperature, so that the bar can meet the temperature requirement of entering the cooling bed, including the initial temperature of entering the cooling bed and the temperature uniformity of each cutting line. The phase transformation starting point of bainite and martensite at the edge part is reduced, the grain size of ferrite at the core part of the steel bar is controlled in a refining way, and the martensite is not generated on the surface of a base circle.
The above description is only an embodiment of the present invention, and is not intended to limit the present invention, and all changes and modifications made according to the present invention are within the scope of the protection scheme of the present patent.
Claims (3)
1. A bar controlled rolling and controlled cooling device is provided with a heating furnace, a roughing mill set, a first flying shear, a middle mill set, a pre-water-through cooling section, a second flying shear, a finishing mill set, a main water-through cooling section, a third flying shear and a cooling bed in sequence along a rolling direction;
the main water-through cooling section comprises a water tank body, wherein an inlet guider, a cooler, a slow cooling pipe group and an outlet guider are sequentially arranged in the water tank body according to the rolling direction, the water tank body is provided with a closed shell, the bottom of the closed shell is provided with a water and gas discharge port, and a cooling water inlet quick connector and a compressed air inlet quick connector are arranged on the shell;
the multi-point temperature measuring instrument is arranged at the outlet of the main through water cooling section, and a measured temperature signal is fed back to the main through water cooling section to be used for adjusting the cooling process parameters of the main through water cooling section and ensuring that the bar material meets the temperature requirement of entering the cooling bed;
the multipoint thermometers comprise a rack, an upper row of thermometers and a lower row of thermometers are arranged on the rack, two movable thermometers are arranged on the upper row, and a first thermometer and a second thermometer are respectively arranged from left to right; three fixed thermometers are arranged on the lower row, and a third thermometer, a fourth thermometer and a fifth thermometer are respectively arranged from left to right;
the device comprises a first temperature measuring instrument, a second temperature measuring instrument, a third temperature measuring instrument, a fourth temperature measuring instrument, a third temperature measuring instrument and a fifth temperature measuring instrument, wherein a temperature measuring point of the fourth temperature measuring instrument is opposite to a rolling center line, the fourth temperature measuring instrument is used for detecting the temperature of a splitting line between single splitting and three splitting, and the third temperature measuring instrument and the fifth temperature measuring instrument are used for detecting the temperatures of two splitting lines outside the four splitting; the first temperature measuring instrument and the second temperature measuring instrument are used for detecting the temperatures of the two segmentation lines outside the two segmentations and the three segmentation lines and the two segmentation lines in the middle of the four segmentations.
2. A bar controlled rolling and cooling device according to claim 1, wherein the slow cooling tube set comprises a plurality of air jets coaxially arranged along a straight line at intervals, each air jet comprises an air jet base, a cavity is arranged in each air jet base, an air inlet pipeline is arranged at the upper part of each air jet base, the left side of each air jet base is connected with the front guide piece, and the right side of each air jet base is connected with the rear guide piece; the front guide piece and the rear guide piece are provided with transverse channels for the bars to pass through, the front end of the front guide piece and the rear end of the rear guide piece are butted in the cavity of the air injection base, annular air injection holes penetrating through the transverse channels are arranged on the peripheral wall of the front guide piece or the rear guide piece in the cavity, or air injection circular seams are formed by butting the front end of the front guide piece and the rear end of the rear guide piece.
3. A bar rolling and cooling control device according to claim 1, wherein the movable temperature measuring instruments are matched with the slide rails on the sliding table through movable sliding seats, and are driven by stepping motors and screw screws, so that the screw screws of the first temperature measuring instrument and the screw screws of the second temperature measuring instrument are positioned on the same axis but are arranged in opposite spiral directions and are driven by the same stepping motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110327942.0A CN113059005B (en) | 2021-03-26 | 2021-03-26 | Bar controlled rolling and cooling device and process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110327942.0A CN113059005B (en) | 2021-03-26 | 2021-03-26 | Bar controlled rolling and cooling device and process |
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| CN113059005A CN113059005A (en) | 2021-07-02 |
| CN113059005B true CN113059005B (en) | 2022-06-03 |
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|---|---|---|---|---|
| CN113843286A (en) * | 2021-08-31 | 2021-12-28 | 欧开来 | Optical fiber sensing intelligent monitoring system |
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| CN116678255B (en) * | 2022-08-31 | 2024-02-09 | 烟台中能环境科技有限公司 | Cooling bed heat exchange equipment, cooling bed heat exchange system and waste heat recovery method of cooling bed heat exchange system |
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