CN114405992B - Production method and system for controlling double high-speed bar sunny and shady surfaces - Google Patents
Production method and system for controlling double high-speed bar sunny and shady surfaces Download PDFInfo
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- CN114405992B CN114405992B CN202210098678.2A CN202210098678A CN114405992B CN 114405992 B CN114405992 B CN 114405992B CN 202210098678 A CN202210098678 A CN 202210098678A CN 114405992 B CN114405992 B CN 114405992B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 54
- 238000005096 rolling process Methods 0.000 claims abstract description 223
- 238000001816 cooling Methods 0.000 claims abstract description 79
- 239000000498 cooling water Substances 0.000 claims abstract description 48
- 238000005520 cutting process Methods 0.000 claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 17
- 239000010959 steel Substances 0.000 claims abstract description 17
- 230000011218 segmentation Effects 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 61
- 238000000034 method Methods 0.000 claims description 14
- 238000009529 body temperature measurement Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 229910000997 High-speed steel Inorganic materials 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 238000010008 shearing Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 2
- 230000008520 organization Effects 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 14
- 230000008901 benefit Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910001341 Crude steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
- B21B2015/0021—Cutting or shearing the product in the rolling direction
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- Metal Rolling (AREA)
Abstract
The invention belongs to the technical field of steel production, and relates to a production method and a system for controlling the sunny and shady surfaces of double high-speed bars, wherein the production method comprises a pre-finish rolling cutting unit, a finish rolling unit, a high-speed flying shear, a tail clamping brake and a cooling bed which are sequentially arranged along the rolling production direction; the finish rolling unit comprises a first finish rolling unit, a flying shear before finish rolling, a second finish rolling unit and a cooling water tank, wherein the first finish rolling unit, the flying shear before finish rolling and the second finish rolling unit are arranged in series along the rolling production direction; the cooling water tanks are arranged behind the pre-finish rolling segmentation unit, the first finishing mill unit and the second finishing mill unit; and a pinch roll for clamping the rolled piece is arranged behind the cooling water tank. According to the invention, the finish rolling unit adopts a multi-line parallel mode, each branch is independently controlled, and the control of the sunny and shady surfaces of the double high-speed bars and the efficient production are realized by independently controlled cooling water tanks, pinch rolls, calipers and thermometers. The control parameters of each branch are controlled differently according to actual conditions, so that the organization and mechanical property differences of products of each branch are reduced.
Description
Technical Field
The invention belongs to the technical field of steel production, and relates to a production method and a system for controlling the sunny and shady surfaces of double high-speed bars.
Background
The bar is mainly divided into a deformed steel bar for construction and a super steel bar, and is widely used in the industries of construction, automobiles, engineering machinery, bridges and metal products. As a threaded steel bar with the highest single yield and specific gravity, the yield of the threaded steel bar reaches 26639 ten thousand tons in 2020, and the threaded steel bar accounts for 25.3% of the crude steel yield in China.
At present, two production modes are mainly adopted aiming at medium and small specification deformed steel bars: a split rolling production mode and a high-speed bar rolling production mode.
1. Cutting and rolling: namely, a rolling technology for longitudinally cutting a rolled piece into two or more lines by using roll passes, cutting wheels in guide devices or other cutting devices in the rolling process. With the progress and maturity of the technology, the final two-split rolling is developed to the maximum six-split, and the yield of a single production line can reach 120-180 ten thousand tons/year. Although the cutting technology can effectively improve the hour output and the annual output of the rolling line, the method still has the following problems and disadvantages:
(1) The cutting rolling speed limit can only reach 18m/s at most, and most production lines only have 14-16m/s at present;
(2) The precise negative deviation rolling of the split rolling product cannot be realized under the influence of multi-line rolling;
(3) The material requirements are more strict, deviation is easy to occur in multi-line control, and compared with single-line rolling, the head cutting amount is increased by 0.5%;
(4) After the cutting and rolling, burrs and edge defects of the product are easy to occur, folding or crack defects are easy to cause, and the yield is low;
(5) After splitting, the product is required to be twisted, a twisting guide is required to be equipped, and the twisting rolling is easy to scratch, so that the surface quality of the product is influenced, the expansion in the rolling process is influenced, and the dimensional accuracy of the final product is further influenced;
(6) The cutting rolling process is easy to fail, the labor intensity of workers is high, and the utilization rate of the rolling mill is reduced.
2. High-speed bar rolling: namely, the rolling technology is that after rolling by a roll collar rolling mill in the rolling process, the high-speed flying shear is used for shearing the steel plate into a rotating hub, and the steel plate is forced to brake by a pinch roll and then enters a cooling bed. With the technical maturity and progress of high-speed bars, the speed of high-speed steel feeding reaches 50m/s, and the yield of a single high-speed bar production line can reach 70-90 ten thousand tons/year.
Besides a single high-speed bar production line, a double high-speed bar production line is more and more favored by manufacturers, and the principle of the double high-speed bar production line is that a pre-finishing mill group is used for slitting and rolling, and rolled pieces after slitting are respectively subjected to 45-degree finishing mill group rolling after being respectively subjected to steel feeding through a high-speed steel feeding system and cooling by a cooling bed. As two finished products can be rolled simultaneously, the annual output of the double high-speed bars can reach 140-160 ten thousand tons/year, the two finished products are respectively rolled by the roller rings of the finishing mill group, the precision of the finished products is high, the surface quality is good, and the temperature control can be realized through the water cooling sections before and after the finish rolling, so that the alloy cost is reduced. However, the present dual high speed bar still has the following problems and disadvantages:
(1) Because the cutting position is in the middle of the rolled piece, the rolled piece has a 'sunny and shady surface' after cutting, the temperature of the rolled piece is easy to fluctuate, and the water cooling parameters are easy to fluctuate;
(2) The rolled piece is easy to twist after being cut, and the rolled piece is easy to cause rolling line faults due to the phenomenon of rotation in the conveying process;
(3) The temperature measuring instrument arranged on the two branches is positioned at one side of the rolled piece, and the temperature deviation of the rolled piece is large due to different measuring positions;
(4) Because of the difference of the temperature and the size of the two branches, the temperature rise and the temperature control difference are caused, and the difference of the tissue and the mechanical property of the two branches is further caused.
Aiming at the problems existing in the existing production of cut bars and double high-speed bars, the invention provides a production method for controlling the sunny and shady sides of double high-speed bars, which can greatly improve the structural uniformity and stability of two-branch products, reduce the difference of mechanical properties, improve the production stability, improve the utilization rate of a rolling mill and improve the economic benefit.
Disclosure of Invention
In view of the above, the invention aims to solve the defects in the prior art, and provides a production method and a system for controlling the sunny and shady surfaces of double high-speed bars, which can greatly improve the structural uniformity and stability of products, reduce the difference of mechanical properties, improve the production stability, improve the utilization rate of a rolling mill and improve the economic benefit.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a production system for controlling the concave and convex surfaces of double high-speed bars comprises a pre-finish rolling cutting unit, a finish rolling unit, a high-speed flying shear, a tail clamping brake and a cooling bed which are sequentially arranged along the rolling production direction; the finish rolling units are at least two groups and are arranged between the pre-finish rolling cutting unit and the high-speed flying shears side by side;
the finish rolling unit comprises a first finish rolling unit, a flying shear before finish rolling, a second finish rolling unit and a cooling water tank, wherein the first finish rolling unit, the flying shear before finish rolling and the second finish rolling unit are arranged in series along the rolling production direction; the cooling water tanks are arranged behind the pre-finish rolling segmentation unit, the first finishing mill unit and the second finishing mill unit; and a pinch roll for clamping the rolled piece is arranged behind the cooling water tank.
Furthermore, the first finishing mill group and the front of the flying shears before finishing mill are respectively provided with a diameter measuring instrument and a temperature measuring instrument.
Further, the thermometers are arranged on two sides of the rolled piece.
Further, a plurality of cooling water tanks which are arranged in series are arranged behind the first finishing mill group and the second finishing mill group.
Furthermore, a diameter measuring instrument is arranged in front of the high-speed flying shears, and a temperature measuring instrument is arranged behind the high-speed flying shears.
Further, the pre-finish rolling splitting unit comprises at least 4 horizontal rolling mills arranged in series along the rolling production direction.
A production method for controlling the female and male surfaces of double high-speed bars adopts the production system, and comprises the following steps:
(1) Splitting and rolling by a pre-finishing mill group: pre-splitting and splitting rolling are carried out on the rolled piece rolled by the middle rolling mill set by adopting a two-frame horizontal rolling mill, and then the rolled piece is rolled by the two-frame horizontal rolling mill; the average elongation coefficient of 4-pass rolling is 1.05-1.35,4, and the temperature of 900-1050 ℃;
(2) Water-cooling temperature control before finish rolling: performing temperature control water cooling before finish rolling on the rolled piece subjected to splitting rolling in the step (1), enabling the rolled piece to enter a cooling water tank before finish rolling after passing through a splitting unit, performing rapid water cooling, performing temperature measurement and diameter measurement on the rolled piece through a temperature measuring instrument and a diameter measuring instrument before a first finish rolling unit, and controlling the temperature of the rolled piece entering an inlet of the first finish rolling unit to be 830-900 ℃;
(3) Rolling by a first finishing mill group: the rolled piece is distributed into a first finishing mill group of each finishing mill unit for 2-pass rolling, the deformation compression ratio of each pass is controlled to be 1.15-1.35 in the rolling process, and the deformation temperature is 830-950 ℃;
(4) Water-cooling temperature control after the first finish rolling: performing temperature control water cooling on the rolled piece rolled by the first finishing mill group in the step (3), enabling the rolled piece to enter the first finishing mill group, then enabling a cooling water tank to be rapidly cooled by water, performing temperature measurement through a front diameter measuring instrument and a temperature measuring instrument of the second finishing mill group, and controlling the temperature of the rolled piece entering an inlet of the second finishing mill group to be 750-850 ℃;
(5) Finish rolling by a second finishing mill group: rolling the rolled piece by a 2-pass second finishing mill group, wherein the deformation compression ratio of each pass is controlled to be 1.2-1.35 in the rolling process, and the deformation temperature is 750-850 ℃;
(6) And (3) water-cooling and temperature controlling after the second finishing mill group: the rolled piece enters a cooling water tank for controlled water cooling after entering a second finishing mill group, the rolled piece is subjected to temperature measurement by a temperature measuring instrument and diameter measurement by a diameter measuring instrument after passing through the second finishing mill group, and the temperature of a cooling bed on the double-wire rolled piece is controlled to be 800-920 ℃;
(7) Shearing and high-speed steel feeding of high-speed flying shears: the rolled piece is subjected to temperature control and water cooling after passing through a second finishing mill group, is sheared by a high-speed flying shear in multiple length, and sequentially enters a double-layer channel of a double-channel guide groove; the speed and the distance of a cooling bed on the bar are controlled by a tail clamping brake, so that steel feeding is completed;
(8) Cooling and collecting and bundling by a cooling bed: the high-speed bars are cooled in a cooling bed, cut to length by cold shears, counted, bundled and aligned, and then are collected after weighing.
Further, when the cooling water tank is adopted for water cooling, a cooling water nozzle is opened after the head of the rolled piece is discharged out of the cooling water tank; a recovery section is arranged between two adjacent cooling water tanks to prevent the surface temperature of the rolled piece from being too low.
Furthermore, the hole type system is an elliptic-circular hole type system during rolling, and guide devices are arranged in front of and behind each rolling mill.
Further, the conveying speed of the rolled piece after the last rolling of the second finishing mill group is finished is 10 m/s-60.0 m/s.
The invention has the beneficial effects that:
1) The finish rolling unit adopts a multi-line parallel mode, and each branch is independently controlled and not affected. The control parameters of each branch are controlled differently according to actual conditions, so that the difference of the organization and mechanical properties of each branch product is reduced, and the stability of the organization and mechanical properties of each branch product is improved.
2) The diameter measuring instrument which is independently arranged can effectively reduce the temperature rise difference caused by the dimensional deviation of the rolled piece;
3) The temperature measuring instruments are independently arranged and are respectively positioned at two sides of the rolled piece, so that the temperature deviation of the rolled piece caused by different measuring positions is effectively reduced, and the phenomenon of 'sunny and shady sides' is further reduced.
4) The pinch roll is arranged behind the cooling water tank, so that the phenomenon of rotation of rolled pieces in the conveying process is avoided, the same temperature measuring position in the front-back conveying process of the rolled pieces is ensured, the process parameters are accurately controlled, and the control precision is improved;
5) The system has wide application range and is suitable for producing bars with the specification range of phi 6.0 mm-phi 22.0 mm.
6) The single independent control rolling method is adopted, so that the product size precision is high; can realize accurate negative deviation rolling and improve the metal yield.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a dual high speed bar line layout employed in the present invention;
reference numerals: 1-a pre-finish rolling segmentation unit; 2-a cooling water tank before finish rolling; 3-a rear pinch roll of the water tank; 4-a front calliper and a thermometer of the first finishing mill group; 5-a first finishing mill group; 6-a first finishing mill group rear cooling water tank; 7-pinch rolls between the water tanks; 8-a second finishing mill group front calliper and a thermometer; 9-flying shears before finish rolling; 10-a second finishing mill group; 11-a second finishing mill group rear cooling water tank; 12-pinch rolls between water tanks; 13-a calliper; 14-high-speed flying shears; 15-a thermometer; 16-tail clamping brake; 17-cooling bed.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1, a production system for controlling the sunny and shady surfaces of double high-speed bars comprises a pre-finish rolling cutting unit, a finish rolling unit, a high-speed flying shear 14, a tail clamping brake 16 and a cooling bed 17 which are sequentially arranged along the rolling production direction; the finish rolling unit comprises a first finish rolling unit 5, a flying shear 9 before finish rolling, a second finish rolling unit 10 and a cooling water tank, wherein the first finish rolling unit 5, the second finish rolling unit 10 and the cooling water tank are arranged in series along the rolling production direction; cooling water tanks are arranged behind the pre-finishing-rolling segmentation unit 1, the first finishing-rolling unit 5 and the second finishing-rolling unit 10; and a pinch roll for clamping the rolled piece is arranged behind the cooling water tank.
The diameter measuring instrument 13 and the temperature measuring instrument 15 are arranged in front of the first finishing mill group 5 and the flying shear 9 before finishing. A diameter measuring instrument 13 is arranged in front of the high-speed flying shears 14, and a temperature measuring instrument 15 is also arranged behind the high-speed flying shears 14. The thermometers 15 are installed on both sides of the rolled piece.
In this embodiment, the finishing rolling units have two groups, which form A, B double lines with the same equipment configuration, and are arranged between the pre-finishing rolling cutting unit and the high-speed flying shears 14 side by side. The first finishing mill group 5 and the second finishing mill group 10 are respectively provided with a plurality of cooling water tanks which are arranged in series and are independently controlled. The pre-finish rolling splitting unit comprises at least 4 horizontal rolling mills arranged in series along the rolling production direction.
Taking line A as an example, according to the rolling production direction, the rolling mill comprises a pre-finishing mill cutting unit 1, a cooling water tank 2 before finishing mill, a pinch roll 3 behind the water tank, a front calliper and thermometer 4 of the first finishing mill, a first finishing mill 5, a rear cooling water tank 6 of the first finishing mill, a pinch roll 7 among the water tanks, a front calliper and thermometer 8 of the second finishing mill, a flying shear 9 before finishing mill, a second finishing mill 10, a rear cooling water tank 11 of the second finishing mill, a pinch roll 12 among the water tanks, a calliper 13, a high-speed flying shear 14, a thermometer 15, a tail clamping brake 16 and a cooling bed 17.
The method for producing 12mm screw-thread steel by adopting the production system in the embodiment comprises the following specific steps:
(1) Splitting and rolling by a pre-finishing mill group: the rolling piece rolled by the vertical box holes of the horizontal interchange rolling mill of the middle rolling mill set is pre-split and split rolled by adopting a 2-frame horizontal rolling mill, and the equivalent area of the rolling piece at the outlet of the vertical box holes is 1210mm 2 The average elongation coefficient of the pre-splitting and splitting rolling passes is 1.11, and the area of the rolled piece after splitting is 488mm 2 Then rolling the rolled piece by two-frame horizontal rolling mill, wherein the pass system is an oval-round hole system, guide devices are arranged in front and back of each rolling mill, the average extension coefficient of twice rolling is 1.32, the diameter of the rolled piece after rolling is 18.7mm, the running speed of the rolled piece is 17.5m/s, and the rolling temperature of 4-pass pre-finishing mill group split rolling is 900-1050 ℃;
(2) Water-cooling temperature control before finish rolling: and (3) performing temperature control water cooling before finish rolling on the rolled piece subjected to split rolling in the step (1), enabling the rolled piece to enter a cooling water tank 2 before finish rolling after passing through a splitting unit, performing rapid water cooling, wherein a cooling water tank nozzle is opened after the head of the rolled piece is discharged from the water tank during water cooling, and a pinch roll arranged at an outlet of the water tank is used for preventing the phenomenon of 'rotation' of the rolled piece due to irregular shape of the rolled piece after split rolling, wherein a recovery section is arranged between the two cooling water tanks so as to prevent the surface temperature of the rolled piece from being too low. The water system of the line A and the line B are independently controlled and are not affected by each other, the temperature and the diameter of the rolled piece are measured by a front thermometer and a diameter gauge 4 of the first finishing mill group, the independent control of the temperature of the rolled piece of the line A is realized, and after the temperature control and water cooling, the temperature of the rolled piece entering an inlet of the first finishing mill group 5 is 830-900 ℃;
(3) Rolling by a first finishing mill group: the rolled piece enters a first finishing mill group 5 for 2-pass rolling, a pass system is an oval-round hole system during rolling, guide devices are arranged in front of and behind each rolling mill, the deformation compression ratio of each pass is controlled to be 1.28 during rolling, the deformation temperature is 830-950 ℃, the equivalent diameter of the rolled piece after rolling is 14.5mm, and the running speed of the rolled piece is 28.6m/s;
(4) Water-cooling temperature control after the first finish rolling: performing temperature control water cooling on the rolled piece rolled in the step (3) by the first finishing mill group 5, rapidly performing water cooling on a cooling water tank after the rolled piece enters the first finishing mill group 5, performing temperature measurement and diameter measurement on the rolled piece by a front diameter measuring instrument and a temperature measuring instrument 8 of a second finishing mill group, wherein the temperature of the inlet of the rolled piece entering the second finishing mill group 10 after the temperature control water cooling is 750-850 ℃;
(5) Finish rolling by a second finishing mill group: rolling the rolled piece by a 2-pass second finishing mill group 10, wherein a pass system is an oval-round hole system, guide devices are arranged in front of and behind each rolling mill, the deformation compression ratio of each pass is controlled to be 1.25 in the rolling process, the deformation temperature is 750-850 ℃, the equivalent diameter of the rolled piece after rolling is 12.0mm, and the running speed of the rolled piece is 45m/s;
(6) And (3) water-cooling and temperature controlling after the second finishing mill group: the rolling piece enters a cooling water tank 11 after a second finishing mill group to control water cooling, a water blocking phenomenon is prevented during water cooling, a water tank nozzle is opened after the head of the rolling piece is discharged from the water tank, a pinch roll is arranged at the outlet of each water tank to prevent the rolling piece from rotating, a return section is arranged between the water tanks, the surface cooling temperature of the rolling piece is higher than a martensitic transformation point to prevent the surface temperature of the rolling piece from being too low, an A line water system and a B line are independently controlled and are not influenced, the temperature of the rolling piece is measured by a temperature measuring instrument 15 and the diameter measuring instrument 13 after the rolling piece passes through the second finishing mill group 10, the independent control of the temperature of the A line rolling piece is realized, and the temperature of a cooling bed 17 on the double-line rolling piece is 800-920 ℃ after the temperature control water cooling;
(7) Shearing and high-speed steel feeding of high-speed flying shears: the rolled piece is subjected to water cooling at a controlled temperature after passing through the second finishing mill group 10, is sheared by a high-speed flying shear with a length of 14 times, and sequentially enters a double-layer channel of a double-channel guide groove; the speed and the distance of a cooling bed 17 on the bar are controlled through a tail clamping brake 16, so that steel feeding is completed;
(8) Cooling and collecting and bundling by a cooling bed: the high-speed bars are cooled in a cooling bed 17, cut to length by cold shears, counted, bundled and aligned and weighed and then collected.
The method for producing 18mm screw-thread steel by adopting the production system in the embodiment comprises the following specific steps:
(1) Splitting and rolling by a pre-finishing mill group: the rolling piece rolled by the vertical box holes of the horizontal interchange rolling mill of the middle rolling mill set is pre-split and split rolled by adopting a 2-frame horizontal rolling mill, and the equivalent area of the rolling piece at the outlet of the vertical box holes is 2400mm 2 The average extension coefficient of the pre-splitting and splitting rolling passes is 1.17, and the area of the rolled piece after splitting is 870mm 2 Then rolling the rolled piece by two-frame horizontal rolling mill, wherein the pass system is an oval-round hole system, guide devices are arranged in front and back of each rolling mill, the average extension coefficient of twice rolling is 1.31, the diameter of the rolled piece after rolling is 25.3mm, the running speed of the rolled piece is 9.7m/s, and the rolling temperature of 4-pass pre-finishing mill group split rolling is 900-1050 ℃;
(2) Water-cooling temperature control before finish rolling: and (3) performing temperature control water cooling before finish rolling on the rolled piece subjected to split rolling in the step (1), enabling the rolled piece to enter a cooling water tank 2 before finish rolling after passing through a splitting unit, performing rapid water cooling, wherein a cooling water tank nozzle is opened after the head of the rolled piece is discharged from the water tank during water cooling, and a pinch roll arranged at an outlet of the water tank is used for preventing the phenomenon of 'rotation' of the rolled piece due to irregular shape of the rolled piece after split rolling, wherein a recovery section is arranged between the two cooling water tanks so as to prevent the surface temperature of the rolled piece from being too low. The water system of the line A and the line B are independently controlled and are not affected by each other, the temperature and the diameter of the rolled piece are measured by a front thermometer and a diameter gauge 4 of the first finishing mill group, the independent control of the temperature of the rolled piece of the line A is realized, and after the temperature control and water cooling, the temperature of the rolled piece entering an inlet of the first finishing mill group 5 is 830-900 ℃;
(3) Rolling by a first finishing mill group: the rolled piece enters a first finishing mill group 5, and the rolling mill is emptied when rolling the specification;
(4) Water-cooling temperature control after the first finish rolling: performing temperature control water cooling on the rolled piece, rapidly cooling the rolled piece by a cooling water tank after entering the first finishing mill group 5, measuring the temperature and the diameter of the rolled piece by a front diameter measuring instrument and a temperature measuring instrument 8 of the second finishing mill group, wherein the temperature of the rolled piece entering an inlet of the second finishing mill group 10 after the temperature control water cooling is 750-850 ℃;
(5) Finish rolling by a second finishing mill group: rolling the rolled piece by a 2-pass second finishing mill group 10, wherein a pass system is an oval-round hole system, guide devices are arranged in front of and behind each rolling mill, the deformation compression ratio of each pass is controlled to be 1.28 in the rolling process, the deformation temperature is 750-850 ℃, the equivalent diameter of the rolled piece after rolling is 20.0mm, and the running speed of the rolled piece is 16m/s;
(6) And (3) water-cooling and temperature controlling after the second finishing mill group: the rolling piece enters a cooling water tank 11 after a second finishing mill group to control water cooling, a water blocking phenomenon is prevented during water cooling, a water tank nozzle is opened after the head of the rolling piece is discharged from the water tank, a pinch roll is arranged at the outlet of each water tank to prevent the rolling piece from rotating, a return section is arranged between the water tanks, the surface cooling temperature of the rolling piece is higher than a martensitic transformation point to prevent the surface temperature of the rolling piece from being too low, an A line water system and a B line are independently controlled and are not influenced, the temperature of the rolling piece is measured by a temperature measuring instrument 15 and the diameter measuring instrument 13 after the rolling piece passes through the second finishing mill group 10, the independent control of the temperature of the A line rolling piece is realized, and the temperature of a cooling bed 17 on the double-line rolling piece is 800-920 ℃ after the temperature control water cooling;
(7) Shearing and high-speed steel feeding of high-speed flying shears: the rolled piece is subjected to water cooling at a controlled temperature after passing through the second finishing mill group 10, is sheared by a high-speed flying shear with a length of 14 times, and sequentially enters a double-layer channel of a double-channel guide groove; the speed and the distance of a cooling bed 17 on the bar are controlled through a tail clamping brake 16, so that steel feeding is completed;
(8) Cooling and collecting and bundling by a cooling bed: the high-speed bars are cooled in a cooling bed 17, cut to length by cold shears, counted, bundled and aligned and weighed and then collected.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (9)
1. The production method for controlling the female and male surfaces of the double high-speed bars is characterized by adopting a production system for controlling the female and male surfaces of the double high-speed bars to produce, wherein the production system for controlling the female and male surfaces of the double high-speed bars comprises a pre-finish rolling cutting unit, a finish rolling unit, a high-speed flying shear, a tail clamping brake and a cooling bed which are sequentially arranged along the rolling production direction; the finish rolling units are at least two groups and are arranged between the pre-finish rolling cutting unit and the high-speed flying shears side by side;
the finish rolling unit comprises a first finish rolling unit, a flying shear before finish rolling, a second finish rolling unit and a cooling water tank, wherein the first finish rolling unit, the flying shear before finish rolling and the second finish rolling unit are arranged in series along the rolling production direction; the cooling water tank is arranged behind the pre-finish rolling segmentation unit, the first finishing mill group and the second finishing mill group; a pinch roll for clamping rolled pieces is arranged behind the cooling water tank;
the production method comprises the following steps:
(1) Splitting and rolling by a pre-finishing mill group: pre-splitting and splitting rolling are carried out on the rolled piece rolled by the middle rolling mill set by adopting a two-frame horizontal rolling mill, and then the rolled piece is rolled by the two-frame horizontal rolling mill; the average elongation coefficient of 4-pass rolling is 1.05-1.35, and the temperature of 4-pass rolling is 900-1050 ℃;
(2) Water-cooling temperature control before finish rolling: performing temperature control water cooling before finish rolling on the rolled piece subjected to splitting rolling in the step (1), enabling the rolled piece to enter a cooling water tank before finish rolling after passing through a splitting unit, performing rapid water cooling, performing temperature measurement and diameter measurement on the rolled piece through a temperature measuring instrument and a diameter measuring instrument before a first finish rolling unit, and controlling the temperature of the rolled piece entering an inlet of the first finish rolling unit to be 830-900 ℃;
(3) Rolling by a first finishing mill group: the rolled piece is distributed into a first finishing mill group of each finishing mill unit for 2-pass rolling, the deformation compression ratio of each pass is controlled to be 1.15-1.35 in the rolling process, and the deformation temperature is 830-950 ℃;
(4) Water-cooling temperature control after the first finish rolling: performing temperature control water cooling on the rolled piece rolled by the first finishing mill group in the step (3), enabling the rolled piece to enter the first finishing mill group, then enabling a cooling water tank to be rapidly cooled by water, performing temperature measurement through a front diameter measuring instrument and a temperature measuring instrument of the second finishing mill group, and controlling the temperature of the rolled piece entering an inlet of the second finishing mill group to be 750-850 ℃;
(5) Finish rolling by a second finishing mill group: rolling the rolled piece by a 2-pass second finishing mill group, wherein the deformation compression ratio of each pass is controlled to be 1.2-1.35 in the rolling process, and the deformation temperature is 750-850 ℃;
(6) And (3) water-cooling and temperature controlling after the second finishing mill group: the rolled piece enters a cooling water tank for controlled water cooling after entering a second finishing mill group, the rolled piece is subjected to temperature measurement by a temperature measuring instrument and diameter measurement by a diameter measuring instrument after passing through the second finishing mill group, and the temperature of a cooling bed on the double-wire rolled piece is controlled to be 800-920 ℃;
(7) Shearing and high-speed steel feeding of high-speed flying shears: the rolled piece is subjected to temperature control and water cooling after passing through a second finishing mill group, is sheared by a high-speed flying shear in multiple length, and sequentially enters a double-layer channel of a double-channel guide groove; the speed and the distance of a cooling bed on the bar are controlled by a tail clamping brake, so that steel feeding is completed;
(8) Cooling and collecting and bundling by a cooling bed: the high-speed bars are cooled in a cooling bed, cut to length by cold shears, counted, bundled and aligned, and then are collected after weighing.
2. The method for producing the double high-speed bar male and female surface control according to claim 1, wherein the method comprises the following steps: and the diameter measuring instrument and the temperature measuring instrument are arranged in front of the first finishing mill group and the flying shear before finishing mill.
3. The method for producing the double high-speed bar male and female surface control according to claim 2, wherein the method comprises the following steps: the temperature measuring instrument is arranged at two sides of the rolled piece.
4. The method for producing the double high-speed bar male and female surface control according to claim 2, wherein the method comprises the following steps: and a plurality of cooling water tanks which are arranged in series are arranged behind the first finishing mill group and the second finishing mill group.
5. The method for producing the double high-speed bar male and female surface control according to claim 1, wherein the method comprises the following steps: the front of the high-speed flying shear is also provided with a diameter measuring instrument, and the rear of the high-speed flying shear is provided with a temperature measuring instrument.
6. The method for producing the double high-speed bar male and female surface control according to claim 1, wherein the method comprises the following steps: the pre-finish rolling segmentation unit comprises at least 4 horizontal rolling mills which are arranged in series along the rolling production direction.
7. The method for producing the double high-speed bar male and female surface control according to claim 1, wherein the method comprises the following steps: when the cooling water tank is used for water cooling, the cooling water nozzle is opened after the head of the rolled piece is discharged out of the cooling water tank; a recovery section is arranged between two adjacent cooling water tanks to prevent the surface temperature of the rolled piece from being too low.
8. The method for producing the double high-speed bar male and female surface control according to claim 1, wherein the method comprises the following steps: the pass system is an elliptic-circular hole system during rolling, and guide devices are arranged at the front and the back of each rolling mill.
9. The method for producing the double high-speed bar male and female surface control according to claim 1, wherein the method comprises the following steps: the conveying speed of the rolled piece after the last rolling of the second finishing mill group is 10 m/s-60.0 m/s.
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