CN212442552U - High-yield high-precision bar cutting production line - Google Patents
High-yield high-precision bar cutting production line Download PDFInfo
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Abstract
The utility model discloses a high-yield high accuracy segmentation rod production line belongs to the rolling technical field of ferrous metallurgy industry rod, the production line includes the heating system who sets gradually along rolling direction of production, rolling system and cold district arrangement system, rolling system is by the roughing mill group, well rolling mill group, water tank and answer section before the finish rolling, finish rolling segmentation rolling mill group, water tank and answer section after the finish rolling, the finishing mill group, water tank and answer section constitute after the finish rolling, it is oval in proper order to be equipped with the pass behind the segmentation rolling pass among the finish rolling segmentation rolling mill group, two rolling passes of circle, the finishing mill group is short stress formula or prestressing type rolling mill. The invention solves the problems of the production bottleneck, high precision, high failure rate coexistence and the like of the typical high-speed bar production line and the slitting bar production line.
Description
Technical Field
The utility model belongs to the technical field of the ferrous metallurgy industry rod is rolling, concretely relates to high yield high accuracy segmentation rod production line.
Background
The yield of crude steel in China reaches 9.96 hundred million tons in 2019, the innovation history is high, the yield is increased by 7.33 percent on a year-by-year basis, wherein the yield of deformed steel bars reaches 2.50 hundred million tons, the yield is increased by 4010 ten thousand tons in the same period in 2018, the yield reaches 25.10 percent of the total amount of steel in China, and the method is widely applied to industries such as buildings, bridges, rail transit and the like. After years of development, the advanced production technology of the deformed steel bar is mature day by day. The bar continuous rolling technology, the endless rolling technology, the hot charging and hot delivery technology, the continuous casting and continuous rolling technology, the low-temperature rolling technology, the water cooling technology, the high-speed steel feeding technology, the splitting rolling technology and the like are mature and applied to a plurality of screw-thread steel manufacturers at home and abroad. At present, the traditional small-specification deformed steel bar is mainly produced by adopting a high-speed steel feeding mode and a splitting rolling mode at home.
1. And (3) a high-speed steel feeding mode: after the bar is rolled by a finishing mill group and cut by a double-length flying shear, a tail clamping brake is adopted for braking, and steel feeding is realized through a rotating hub. According to the production mode, due to the fact that single rolling and steel feeding are adopted, the relative size precision is high, the failure rate is low, and along with the steel used for the reinforced concrete in 2018, 11, 1 and 1 GB/T1499.2-2018, the steel used for the reinforced concrete is part 2: the implementation of hot rolling ribbed steel bars is more and more popular with screw-thread steel production plants, and the production line is easier to realize the controlled rolling and controlled cooling process of screw-thread steel bars, is beneficial to enterprises to reduce the production cost, and can be rapidly popularized and applied in China in two years. In order to improve the production line yield, a two-line cutting and high-speed steel feeding system is combined, a double-high-speed bar production process is adopted, and the annual yield of the current high-speed bar production line and the annual yield of the double-high-speed bar production line can reach 80 ten thousand tons and 150 ten thousand tons respectively.
2. A splitting rolling mode: the bars are pre-split and split by a full horizontal rolling mill in a finishing mill group, and then a single rolling line is split into two or three bars, and partial manufacturers realize four-line splitting, five-splitting and even six-splitting rolling technologies. A typical apron board is adopted for steel feeding in a splitting rolling technology, and a plurality of rolled pieces are simultaneously fed in a multi-line splitting process, so that the rolled pieces are mutually interfered, and faults are easily caused. Meanwhile, the slitting rolling has the following defects: (1) the slitting rolled product cannot realize negative deviation rolling; (2) after slitting and rolling, burrs are easy to appear on the product, and folding or crack defects are easy to cause; (3) the multi-line splitting rolling process is easy to have faults, and the utilization rate of the rolling mill is reduced; (4) special guides and guards are required for slitting rolling, and the slitting process has high requirements on rolling line adjustment workers, particularly slitting over four lines; (5) the prior slitting process can not realize a controlled rolling and controlled cooling process, and the alloy cost of the deformed steel bar is higher, so that the production cost is higher; (6) the cut rate and the yield are mutually restricted. The annual output of the existing deformed steel bar cutting production line is generally 80-150 ten thousand tons.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a high-yield high accuracy segmentation rod production line solves the output bottleneck, high accuracy and the coexistence of high fault rate, the technological realization scheduling problem that does not adapt to under the new national standard situation that above-mentioned typical high-speed rod production line and segmentation rod production line exist.
The utility model discloses a realize through following technical scheme:
the utility model also provides a high-yield high accuracy segmentation rod production line, include the heating system who sets gradually along rolling direction of production, rolling system and cold district arrangement system, rolling system mainly by the roughing mill group of arranging in succession, well rolling mill group, water tank and reply section before the finish rolling, finish rolling segmentation rolling mill group, water tank and reply section behind the finish rolling, the finishing mill group, water tank and reply section constitute behind the finish rolling, it is oval in proper order to be equipped with the pass behind the segmentation rolling pass in the finish rolling segmentation rolling mill group, two rolling passes of circle, the finishing mill group is short stress formula or prestressing type rolling mill.
Further, the heating system adopts a heating furnace or an electromagnetic induction heat supplementing device; a cutting head flying shear A, a cutting head flying shear B and a cutting head flying shear C are respectively arranged in front of a middle rolling mill group, a finish rolling mill group and a finishing rolling mill group of the rolling system; the cold area arrangement system comprises a multi-length flying shear, a multi-line roller way, a skirt board, a cooling bed, an output roller way, a fixed-length cold shear, a finished product collecting device and a waste product collecting device.
Further, the final rolling mill group adopts two-pass rolling with hole patterns of ellipse and circle in sequence.
Furthermore, one prestressed rolling mill in the final rolling mill set comprises a pre-tightening hydraulic cylinder, a screw rod, a lower bearing seat, a roller, an upper bearing seat and a pressing mechanism which are arranged on the stand; the upper bearing seat and the lower bearing seat are respectively provided with a roller and are connected through a screw rod and a left-handed screw and a right-handed screw which are respectively arranged on the screw rod; the screw rod is also connected with a pressing mechanism; the pre-tightening hydraulic cylinders are arranged in a vertically corresponding mode and act on the upper bearing block and the lower bearing block through convex surface pads respectively; spherical pads are also arranged on the left-handed screw and the right-handed screw.
The utility model has the advantages that: the utility model discloses an adopt the segmentation rolling to guarantee to produce the hourly output of line, and adopt oval-round pass system rolling after the segmentation, guarantee the product rule behind the finishing mill group, do benefit to the refrigerated homogeneity of control, and guarantee through the combination of water-cooling section and answer section that the rolled piece gets into the top layer temperature and the core table difference in temperature of finishing mill group and satisfy the technological requirement, the rolling is rolled under the low temperature of finishing mill group and the big reduction, do benefit to the tissue and refine, and through the water-cooling control tissue after the finishing rolling, this production line, the technology is arranged simply, it is high to produce the annual output of line, screw-thread steel size precision is high, the production fault rate is lower, the construction cost is low, easily realize industrial production, obvious economic benefits has.
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 objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a high-yield high-precision bar material slitting production line of the present invention; the arrow represents the rolling production direction.
FIG. 2 is a schematic structural view of a pre-stressed rolling mill of the finishing train of the present invention; a is a side sectional view and b is a front view.
Fig. 3 is a typical cooling curve of phi 14 mm.
Element number description: a heating furnace 1; a roughing mill train 2; a head cutting flying shear A3, a head cutting flying shear B6 and a head cutting flying shear C9; a medium mill group 4; a water tank and a recovery section 5 before finish rolling; a finishing rolling splitting rolling unit 7; a water tank and a recovery section 8 after finish rolling; a finishing train 10; a water tank and a return section 11 after final rolling; a multiple length flying shear 12; a multi-line roller table 13; the skirt panels 14; a cooling bed 15; a run-out table 16; a sizing cold shear 17; a finished product collection device 18; a waste collector 19. Pre-tightening the hydraulic cylinder 10-1; convex pad 10-2; 10-3 of a screw rod; spherical pads 10-4; 10-5 parts of left-handed screws; 10-6 parts of right-handed screw; 10-7 of a lower bearing seat; 10-8 parts of a roller; an upper bearing block 10-9; 10-10 of a frame; and a pressing mechanism 10-11.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.
The utility model provides a high yield high accuracy segmentation rod production line, high accuracy and the high fault rate that exist to typical high-speed rod production line and segmentation rod production line coexist, adapt to the problem that the technology under the new national standard situation realized, the utility model provides a high yield high accuracy segmentation rod production line adopts the multi-thread segmentation rolling through the finishing mill group to two adopt oval-round hole type systems behind the finishing mill group, adopt the water-cooling behind the finishing mill group, the finishing mill group adopts rolling technology under the low temperature big push down, and the finishing mill group rolls after through the cooling of control after the braking of skirtboard after, the cooling bed cooling on, this production technology can improve screw-thread steel rod annual output, improve size precision, realize the controlled rolling controlled cooling technology, reduce production fault rate, improve economic benefits.
As shown in fig. 1, the production line for high-yield and high-precision slit bars provided in this embodiment mainly includes a heating furnace 1 or an electromagnetic induction heat-compensating device, a roughing mill group 2, a crop flying shear a3, a middle mill group 4, a water tank and a recovery section 5 before finish rolling, a crop flying shear B6, a finish rolling slit mill group 7, a water tank and a recovery section 8 after finish rolling, a crop flying shear C9, a finishing mill group 10, a water tank and a recovery section 11 after finish rolling, a double-length flying shear 12, a multi-line roller table 13, a skirt plate 14, a cooling bed 15, an output roller table 16, a fixed-length cold shear 17, a finished product collecting device 18, and a waste collecting device 19, which are sequentially arranged along a rolling production direction. The finish rolling segmentation rolling unit adopts a segmentation process of 2 to 6 segmentation; after the slitting rolling, carrying out oval-round two-time rolling, carrying out finish rolling and then cooling control; after finish rolling, the section of the cooling bar is regular and round; and the final mill group adopts a short stress type or a prestressed type mill.
The number of single lines of the final rolling unit in the embodiment is not more than 3 in single pass; the bar material has high product precision, less winding, stable production line, high yield and low failure rate, and is easy to reduce the alloy cost through controlled rolling and controlled cooling.
The finishing train in this embodiment is in a horizontal-horizontal arrangement; the hole pattern is ellipse-circle; and if the final rolling two-line rolling is carried out, the final rolling mill groups are arranged in a staggered mode. As shown in FIG. 2, a pre-stressed rolling mill in the final rolling mill set comprises a pre-tightening hydraulic cylinder 10-1, a screw rod 10-3, a lower bearing seat 10-7, a roller 10-8, an upper bearing seat 10-9 and a pressing mechanism 10-11 which are arranged on a frame 10-10; the upper bearing seat 10-9 and the lower bearing seat 10-7 are respectively provided with a roller 10-8 and are connected through a screw rod 10-3 and a left-handed screw 10-5 and a right-handed screw 10-6 which are respectively arranged on the screw rod; the screw rod 10-3 is also connected with a pressing mechanism 10-11; the pre-tightening hydraulic cylinders 10-1 are arranged up and down correspondingly and act on the upper bearing seat 10-9 and the lower bearing seat 10-7 through the convex surface pads 10-2 respectively; the left-handed screw 10-5 and the right-handed screw 10-6 are also provided with a spherical pad 10-4.
The single-skirt-plate or double-skirt-plate braking mode is adopted for the cooling on the deformed steel bars in the embodiment, and when the single skirt plate brakes, no more than 3 deformed steel bars are braked simultaneously.
Specifically, the production method of the high-yield high-precision slitting bar production line comprises the following steps:
(1) heating: the steel billet with the cross section size of 150mm multiplied by 150mm to 200mm multiplied by 200mm is heated to 900 to 1300 ℃ by adopting a walking beam type heating furnace or an electromagnetic induction heat supplementing device.
(2) Rolling by a roughing mill set: and (2) rolling the square blank heated in the step (1) by adopting a horizontal-vertical alternative or flat-roller rolling mode through a 6-pass or 8-pass short-stress-line rough rolling unit, wherein when the rough rolling unit is used for rolling, a non-pass rolling mode and a pass rolling mode can be adopted, when the pass rolling mode is adopted, the rough rolling unit is a box-oval-round pass system, when the pass rolling mode is adopted, a guide and guard are arranged at the front and the rear of each rolling machine, a cutting head flying shear A is arranged behind the rough rolling unit, the deformation compression ratio of each pass is controlled to be 1.20-1.45 in the rolling process, the deformation temperature is 880-1200 ℃, and the running speed of the rolled piece in the rolling process of the rough rolling unit is 0.075 m/s-3..
(3) Rolling by a medium rolling mill set: and (3) carrying out 6-pass or 8-pass short stress line intermediate rolling mill set rolling on the rolled piece subjected to rough rolling in the step (2) and subjected to head and tail cutting by the head and tail cutting flying shear A, wherein a pass system is an oval-round pass system during rolling, guides and guards are arranged at the front and the back of each rolling mill, the deformation compression ratio of each pass is controlled to be 1.20-1.40, the deformation temperature is 850-1100 ℃, and the running speed of the rolled piece is 1.0-10.00 m/s in the rolling process.
(4) Rolling by a finishing mill group: and (3) after the intermediate rolling, the rolled piece which is subjected to the water tank before the finish rolling and the recovery section and subjected to the head and tail cutting by the head cutting flying shear B is subjected to 6-pass short stress line finishing mill set splitting rolling, the rolling mill set is arranged into a horizontal rolling mill, a vertical rolling mill, a horizontal rolling mill and a horizontal rolling mill, a hole pattern system during the rolling is a flat roller, a box type, pre-splitting, an ellipse and a circular hole pattern system, guides and guards are arranged at the front and the rear of each rolling mill, the deformation compression ratio of each pass is controlled to be 1.10-1.20, the deformation temperature is controlled to be 900-1050 ℃, and the running speed of the rolled piece is 1.0-18.00 m/s.
(5) And (3) controlling and cooling after the finishing mill group: and (4) carrying out multi-water tank combined type sectional cooling on the rolled piece subjected to splitting, finish rolling and rounding in the step (4), and after cooling recovery, feeding the rolled piece into a finishing mill group at the temperature of 700-900 ℃.
(6) And (3) rolling by a final rolling group: and (3) further rolling the rolled piece subjected to controlled cooling in the step (5) by using a final rolling mill group, wherein the final rolling mill group can be a short-stress type rolling mill or a pre-stress type rolling mill, the pass system is an oval-round pass system, guides and guards are arranged at the front and the back of each rolling mill during rolling, the deformation compression ratio of each pass is controlled to be 1.20-1.30, the deformation temperature is 700-900 ℃, and the running speed of the rolled piece is 1.0-18.0 m/s.
(7) And (3) controlling and cooling after the finishing mill set: and (4) carrying out multi-water tank combined type sectional cooling on the rolled piece rolled by the final rolling unit in the step (6) so as to control the phase change process of the rolled piece.
(8) Multiple-length shearing and cold bed loading: and (4) performing multi-length shearing on the bar subjected to the controlled cooling in the step (7), and then enabling the multi-wire rolled piece to enter a cooling bed through an apron board or a double apron board.
(9) Cooling by a cooling bed: after being loaded on a cooling bed, the multi-length deformed steel bar runs on the cooling bed in a stepping mode and is aligned on an alignment roller way, and the temperature of the bar in the cooling bed is 300-750 ℃;
(10) bundling and collecting: and (4) conveying the deformed steel bar cooled by the cooling bed in the step (9) through a roller way, performing fixed-length cold shearing, and completing collection and warehousing after cross inspection, counting, bundling, label hanging and weighing.
Compared with a high-speed steel feeding system and a common production line for splitting the deformed steel bars, the production line for splitting the deformed steel bars with high energy and high precision can ensure the hourly yield of the production line by adopting splitting rolling, adopts an oval-round hole type system for rolling after splitting, ensures the product rule after a finishing mill set, is favorable for controlling the uniformity of cooling, ensures that the surface temperature and the core surface temperature difference of a rolled piece entering the finishing mill set meet the process requirements by combining a water cooling section and a return section, is favorable for tissue refinement by low-temperature rolling and high-pressure rolling of the finishing mill set, and controls the tissue by water cooling after finishing rolling. The production line has the advantages of high annual output of the production line, high size precision of the deformed steel bar, low production failure rate, high economic benefit of the production line and the like. The method comprises the following specific steps:
1) and when the induction heat compensation is adopted for the continuous casting billet, the investment cost and the operation cost are saved.
2) And a temperature control water tank is arranged behind the finishing mill group to control the rolling temperature of the finishing mill group, the finishing mill group rolls at low temperature and high pressure, and the mechanical property of the finished product is improved by fine grain strengthening and phase change strengthening in combination with cooling after rolling.
3) Compared with a conventional bar splitting production line, the steel on the cooling bed rack is placed in a mode of being at most three, the precision of bar products is high, the winding is few, the production line is stable, the yield is high, the failure rate is low, and the alloy cost is easily reduced through controlled rolling and controlled cooling.
4) The production specification range of the product is wide, and all deformed steel bar products with the specification range of phi 12.0 mm-phi 50.0mm can be produced.
5) The production line has high yield, and the annual yield of a single line can reach 180-250 ten thousand tons.
6) And because the number of the finish rolling mill group rolled at the same time is small, the product size precision is high.
7) And the section of the rolled piece after finish rolling is regular and circular, and the rolled piece is cooled uniformly.
8) The negative deviation rolling can be realized, and the metal yield is high.
9) The rolling speed range of the finished product deformed steel bar is 1.0-18.0 m/s.
Example 1
Referring to fig. 3 and table 1, according to the present invention, the production process sequence includes: heating, rough rolling, intermediate rolling, finish rolling, cooling after finish rolling, multiple-length shearing, and cooling on a skirtboard on a cooling bed and a cooling bed. Taking the cut production of the deformed steel bar 4 with the diameter of 16.0mm as an example, the process comprises the following steps:
(1) heating: a walking beam type heating furnace or an electromagnetic induction heat supplementing device is adopted to heat or supplement heat to 900-1300 ℃ for the blank with the section size of 165mm multiplied by 12000mm, and the temperature difference between the head and the tail and the temperature difference between the core surface are not more than 30 ℃.
(2) Rolling by a roughing mill set and cutting the head after roughing: and (2) carrying out 6-pass short stress line rough rolling unit rolling on the square billet heated in the step (1) by adopting a horizontal and vertical alternative rolling mill, wherein the deformation compression ratio of each pass in the rolling process is 1.32, the diameter of the equivalent circle after rough rolling is 82.0mm, the deformation temperature is 880-950 ℃, the rough rolling biting speed is 0.465m/s, and the outlet speed of the rough rolling unit is 2.46 m/s.
(3) Rolling by a medium rolling mill set: and (3) after rough rolling in the step (2), performing 2-pass short stress line intermediate mill set rolling, wherein the deformation compression ratio of each pass is controlled to be 1.281 in the rolling process, the diameter of the equivalent circle after intermediate rolling is 64.0mm, the deformation temperature is 850-900 ℃, the intermediate rolling biting speed is 2.46m/s, and the outlet speed of the intermediate mill set is 4.04 m/s.
(4) Rolling by a finishing mill group: and (4) after the intermediate rolling in the step (3), performing 4-split rolling by using a 6-pass short-stress-line finishing mill group, wherein the deformation compression ratio of each pass in the rolling process is 1.16, the diameter of each line equivalent circle after the finish rolling is 41.0mm, the deformation temperature is 900-1000 ℃, the finish rolling biting speed is 4.04m/s, and the outlet speed of the finishing mill group is 9.85 m/s.
(5) And (3) controlling and cooling after the finishing mill group: and (4) carrying out multi-water tank combined type sectional cooling on the rolled piece subjected to splitting, finish rolling and rounding in the step (4), and after cooling recovery, feeding the rolled piece into a finishing mill group at the temperature of 700-900 ℃.
(6) And (3) rolling by a final rolling group: and (4) further rolling the rolled piece subjected to the controlled cooling in the step (5) by using a final rolling mill group, wherein the final rolling mill group is a prestressed rolling mill, the deformation compression ratio of each pass is controlled to be 1.265, the deformation temperature is 700-800 ℃, the final rolling biting speed is 9.85m/s, and the outlet speed of the final rolling mill group is 15.7m/s in the rolling process.
(7) And (3) controlling and cooling after the finishing mill set: and (4) carrying out multi-water tank combined type sectional cooling on the rolled piece rolled by the final rolling unit in the step (6), wherein the lowest temperature of the surface layer is more than 450 ℃ during cooling.
(8) Multiple-length shearing and cold bed loading: and (3) performing multiple-length shearing on the bar subjected to the controlled cooling in the step (7), enabling the two lines to enter a roller way of a left line for running, and enabling the other two lines to enter a roller way of a right line for running to enter a cooling bed through a left skirt board and a right skirt board respectively.
(9) Cooling by a cooling bed: after the multi-length deformed steel bar is put on a cooling bed, the multi-length deformed steel bar runs on the cooling bed in a stepping mode and is aligned on a roller way, and the temperature of the bar in the cooling bed is 350.
(10) Bundling and collecting: and (4) conveying the deformed steel bar cooled by the cooling bed in the step (9) through an output roller way, performing fixed-length cold shearing, and completing collection and warehousing after cross inspection, counting, bundling, tag hanging and weighing.
Table 1 bar specification rolling parameter table
Example 2
Referring to fig. 3 and table 1, according to the present invention, the production process sequence includes: heating, rough rolling, intermediate rolling, finish rolling, cooling after finish rolling, multiple-length shearing, and cooling on a double-apron plate cooling bed and a cooling bed. Taking the cut production of the deformed steel bar 2 with the diameter of 25.0mm as an example, the process comprises the following steps:
(1) heating: a walking beam type heating furnace or an electromagnetic induction heating device is adopted to heat or supplement heat to 900-1300 ℃ for the blank with the section size of 165mm multiplied by 12000mm, and the temperature difference between the head and the tail and the temperature difference between the core surface are not more than 30 ℃.
(2) Rolling by a roughing mill set and cutting the head after roughing: and (2) carrying out 6-pass short stress line rough rolling unit rolling on the square billet heated in the step (1) by adopting a horizontal and vertical alternative rolling mill, wherein the deformation compression ratio of each pass in the rolling process is 1.32, the diameter of the equivalent circle after rough rolling is 82.0mm, the deformation temperature is 880-950 ℃, the rough rolling biting speed is 0.465m/s, and the outlet speed of the rough rolling unit is 2.46 m/s.
(3) Rolling by a medium rolling mill set: and (3) after rough rolling in the step (2), performing 2-pass short stress line intermediate mill set rolling, wherein the deformation compression ratio of each pass is controlled to be 1.21 in the rolling process, the diameter of the equivalent circle after intermediate rolling is 68.0mm, the deformation temperature is 850-900 ℃, the intermediate rolling biting speed is 2.46m/s, and the outlet speed of the intermediate mill set is 3.58 m/s.
(4) Rolling by a finishing mill group: and (4) after the intermediate rolling in the step (3), performing 6 times of cutting rolling by using a short stress line finishing mill group 2, wherein the deformation compression ratio of each time in the rolling process is 1.15, the diameter of each line equivalent circle after the finish rolling is 45.3mm, the deformation temperature is 900-1000 ℃, the finish rolling biting speed is 3.58m/s, and the outlet speed of the finishing mill group is 8.07 m/s.
(5) And (3) controlling and cooling after the finishing mill group: and (4) carrying out multi-water tank combined type sectional cooling on the rolled piece subjected to splitting, finish rolling and rounding in the step (4), and after cooling recovery, feeding the rolled piece into a finishing mill group at the temperature of 700-900 ℃.
(6) And (3) rolling by a final rolling group: and (4) further adopting a final rolling mill group to roll the rolled piece subjected to the controlled cooling in the step (5), wherein the final rolling mill group can be a short-stress rolling mill, the deformation compression ratio of each pass is controlled to be 1.265, the deformation temperature is 700-800 ℃, the final rolling biting speed is 8.07m/s, and the outlet speed of the final rolling mill group is 12.9m/s in the rolling process.
(7) And (3) controlling and cooling after the finishing mill set: and (4) carrying out multi-water tank combined type sectional cooling on the rolled piece rolled by the final rolling unit in the step (6), wherein the lowest temperature of the surface layer is more than 450 ℃ during cooling.
(8) Multiple-length shearing and cold bed loading: and (4) performing multiple-length shearing on the bar subjected to controlled cooling in the step (7), then feeding one line of the bar into a left-line roller way to run, and feeding the other line of the bar into a right-line roller way to run respectively through a left skirt board and a right skirt board to enter a cooling bed.
(9) Cooling by a cooling bed: after the multi-length deformed steel bar is put on a cooling bed, the multi-length deformed steel bar runs on the cooling bed in a stepping mode and is aligned on a roller way, and the temperature of the bar in the cooling bed is 350.
(10) Bundling and collecting: and (4) conveying the deformed steel bar cooled by the cooling bed in the step (9) through an output roller way, performing fixed-length cold shearing, and completing collection and warehousing after cross inspection, counting, bundling, tag hanging and weighing.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it is obvious that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (4)
1. The high-energy-yield high-precision slitting bar production line comprises a heating system, a rolling system and a cold area arrangement system which are sequentially arranged along the rolling production direction, and is characterized in that the rolling system mainly comprises a rough rolling unit (2), a middle rolling unit (4), a water tank and a return section (5) before finish rolling, a finish rolling slitting rolling unit (7), a water tank and a return section (8) after finish rolling, a final rolling unit (10), a water tank and a return section (11) after finish rolling, two rolling passes of which the hole patterns are oval and round in sequence are arranged behind the slitting rolling pass in the finish rolling slitting rolling unit, and the final rolling unit is a short-stress type or pre-stress type rolling mill.
2. The production line for high-yield and high-precision slit bars according to claim 1, characterized in that the heating system adopts a heating furnace (1) or an electromagnetic induction heat-compensating device; a cutting head flying shear A (3), a cutting head flying shear B (6) and a cutting head flying shear C (9) are respectively arranged in front of a middle rolling mill group, a finish rolling and splitting rolling mill group and a finishing rolling mill group of the rolling system; the cold area tidying system comprises a multi-length flying shear (12), a multi-line roller way (13), an apron board (14), a cooling bed (15), an output roller way (16), a fixed-length cold shear (17), a finished product collecting device (18) and a waste product collecting device (19).
3. The production line for high-yield and high-precision slitting bars according to claim 1, wherein the final rolling mill set adopts two passes of rolling with hole patterns sequentially being oval and round.
4. The production line for high-yield and high-precision segmented bars according to any one of claims 1 to 3, wherein one pre-stressed rolling mill in the final rolling mill group comprises a pre-stressed hydraulic cylinder (10-1) arranged on a frame (10-10), a screw rod (10-3), a lower bearing seat (10-7), a roller (10-8), an upper bearing seat (10-9) and a screw-down mechanism (10-11); the upper bearing seat and the lower bearing seat are respectively provided with a roller and are connected through a screw rod and a left-handed screw (10-5) and a right-handed screw (10-6) which are respectively arranged on the screw rod; the screw rod is also connected with a pressing mechanism; the pre-tightening hydraulic cylinders are arranged up and down correspondingly and act on the upper bearing block and the lower bearing block through convex surface pads (10-2) respectively; spherical pads (10-4) are also arranged on the left-handed screw and the right-handed screw.
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| CN (1) | CN212442552U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113600613A (en) * | 2021-08-19 | 2021-11-05 | 宝武集团鄂城钢铁有限公司 | Bar rolling method and application thereof |
| CN114472510A (en) * | 2022-01-19 | 2022-05-13 | 山西建龙实业有限公司 | Multi-line cutting rolling and cooling control process production line |
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2020
- 2020-07-31 CN CN202021563924.XU patent/CN212442552U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113600613A (en) * | 2021-08-19 | 2021-11-05 | 宝武集团鄂城钢铁有限公司 | Bar rolling method and application thereof |
| CN113600613B (en) * | 2021-08-19 | 2023-02-21 | 宝武集团鄂城钢铁有限公司 | Bar rolling method and application thereof |
| CN114472510A (en) * | 2022-01-19 | 2022-05-13 | 山西建龙实业有限公司 | Multi-line cutting rolling and cooling control process production line |
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