CN116159862A - Method for controlling bending degree of deformed steel bar - Google Patents

Method for controlling bending degree of deformed steel bar Download PDF

Info

Publication number
CN116159862A
CN116159862A CN202310146213.4A CN202310146213A CN116159862A CN 116159862 A CN116159862 A CN 116159862A CN 202310146213 A CN202310146213 A CN 202310146213A CN 116159862 A CN116159862 A CN 116159862A
Authority
CN
China
Prior art keywords
rolling mill
rolling
rolled piece
deformed steel
hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310146213.4A
Other languages
Chinese (zh)
Inventor
陈祖政
张鑫
陈海明
胡学民
巫献华
陈琴
余欢
李班
幸岚春
王丘轲
杨子亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Zhongnan Iron and Steel Co Ltd
Original Assignee
Guangdong Zhongnan Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Zhongnan Iron and Steel Co Ltd filed Critical Guangdong Zhongnan Iron and Steel Co Ltd
Priority to CN202310146213.4A priority Critical patent/CN116159862A/en
Publication of CN116159862A publication Critical patent/CN116159862A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • B21B1/46—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 metal immediately subsequent to continuous casting
    • B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • 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
    • 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
    • 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
    • B21B37/68—Camber or steering control for strip, sheets or plates, e.g. preventing meandering
    • 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
    • B21B45/004—Heating 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
    • 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
    • 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
    • B21B45/0269—Cleaning
    • B21B45/0275—Cleaning devices
    • B21B45/0278—Cleaning devices removing liquids
    • B21B45/0281—Cleaning devices removing liquids removing coolants
    • 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
    • B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
    • 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
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

The embodiment of the invention provides a method for controlling the bending degree of deformed steel bars, which comprises the following steps of: smelting raw materials to obtain molten steel; continuous casting, namely pouring the molten steel into a continuous casting machine to obtain a continuous casting blank; heating, namely transferring the continuous casting blank into a heating furnace for heating to obtain rolled pieces, and rolling the rolled pieces to obtain deformed steel bars; cooling, namely cooling the deformed steel bar by adopting a water penetrating tank; shearing, namely shearing the cooled deformed steel bars by using a double-length shear. The temperature difference between the upper surface and the lower surface of the rolled piece is controlled within 10 ℃ so as to ensure the uniformity of temperature distribution from the upper surface to the lower surface of the rolled piece and reduce the possibility of bending deformed steel bars; the back-blowing air pipe is arranged in the water penetrating tank, so that water on the surface of the deformed steel bar can be dried, water drops are prevented from being concentrated on the lower surface of the deformed steel bar, and the temperature difference between the upper surface and the lower surface of the deformed steel bar is effectively controlled.

Description

Method for controlling bending degree of deformed steel bar
Technical Field
The invention relates to the technical field of deformed steel bar processing, in particular to a method for controlling bending degree of deformed steel bar.
Background
In the process of processing the deformed steel bar, because the process parameter is unreasonable to be set, or the stability of the process and the equipment fluctuates, the phenomenon that the deformed steel bar is easy to generate an elbow after being put on a cooling bed occurs, the deformed steel bar is easy to cause a series of problems of disorder steel of the cooling bed, forking steel of a roller way before shearing, shearing and folding elbow by fixed length and the like, the production quality and the efficiency are seriously influenced, and potential safety hazards are easy to cause.
In view of this, the present application is specifically proposed.
Disclosure of Invention
Objects of the present invention include, for example, providing a method of controlling the bending of a deformed steel bar that is capable of controlling the bending of the deformed steel bar and reducing the phenomenon of bending.
Embodiments of the invention may be implemented as follows:
in a first aspect, the present invention provides a method of controlling the bending of a deformed steel bar, comprising the steps of, in order:
smelting raw materials to obtain molten steel;
continuous casting, namely pouring the molten steel into a continuous casting machine to obtain a continuous casting blank;
heating, namely transferring the continuous casting blank into a heating furnace for heating to obtain a rolled piece, wherein the temperature difference between the upper surface and the lower surface of the rolled piece is less than 10 ℃;
rolling, namely rolling the rolled piece to obtain deformed steel bars;
the method comprises the steps of cooling, namely cooling screw steel by adopting a water penetrating tank, wherein the water penetrating tank is sequentially provided with a forward gas seal, a first water cooler, a first reverse water seal, a second water cooler, a second reverse water seal, a third water cooler, a third reverse water seal, a first reverse gas seal and a second reverse gas seal along the steel feeding-in-to-steel tapping direction;
shearing, namely shearing the cooled deformed steel bars by using a double-length shear;
an air inlet and an air outlet are arranged in the water penetrating tank between the third reverse water seal and the first reverse air seal, and a back-blowing air pipe facing the lower surface of the screw steel is connected to the air inlet;
and/or an air inlet and an air outlet are arranged in the water penetrating tank between the first reverse air seal and the second reverse air seal, and a back-blowing air pipe facing the lower surface of the screw steel is connected to the air inlet.
In an alternative embodiment, the strand outlet of the continuous casting machine is connected with the strand inlet of the heating furnace by a conveying device, and a heat-insulating cover is arranged on the conveying device.
In an alternative embodiment, a feeding rack is arranged at the outer side of the continuous casting billet inlet of the heating furnace, and a heat preservation cover is arranged on the feeding rack.
In an alternative embodiment, the continuous casting machine further comprises a conveying trolley for transferring the continuous casting billet leaving the continuous casting machine into a loading rack or a heating furnace, wherein a heat preservation cover is arranged on the conveying trolley.
In an alternative embodiment, the first water cooler, the second water cooler and the third water cooler are respectively provided with a cooling water inlet and a cooling water outlet, and the cooling water inlet is connected with a circular seam type nozzle with adjustable circular seam size.
In an alternative embodiment, when the screw steel is sheared, the shearing edge of the multiple-length shearing machine moves in the same direction with the screw steel, and the ratio of the linear speed of the shearing edge of the multiple-length shearing machine to the linear speed of the screw steel is 1.10-1.15.
In an alternative embodiment, when the tail of the tail section of the sheared deformed steel bar is not bent, and the tail of the other sections are bent, the advance rate of the length-doubling shear is reduced;
when the head of the first section of the sheared deformed steel bar is not bent and the heads of the other sections are bent, the advance rate of the length-doubling shearing is increased.
In an alternative embodiment, the rolling step adopts three-line slitting rolling, and the rolled piece passes through a pre-finish rolling device, wherein the pre-finish rolling device comprises 4 frames 450 rolling mills and 2 frames 350 rolling mills which are sequentially arranged, and the numbers are 11#, 12#, 13#, 14#, 15#, and 16#, respectively; wherein, the 12# rolling mill is a vertical rolling mill, and the other five frames are horizontal rolling mills; the 11# rolling mill adopts non-hole rolling, the 12# rolling mill hole is a box hole, the 13# rolling mill hole is a pre-cutting hole, the 14 rolling mill hole is a cutting hole, the 15# rolling mill hole is an elliptical hole, and the 16# rolling mill hole is a finished round hole; the width of the rolled piece entering the 11# rolling mill is 6-8mm larger than the height of the rolled piece entering the 12# rolling mill, and the height of the rolled piece entering the 11# rolling mill is matched with the width of the groove bottom of the cutting hole of the 12# rolling mill.
In an alternative embodiment, after the rolled piece passes through the 12# rolling mill, the width of the black strip at the edge of the rolled piece accounts for 70% -80% of the width of the rolled piece;
preferably, the area of the middle hole of the cutting hole of the No. 13 rolling mill is 3-5% smaller than that of the holes at the two sides;
preferably, the feeding side of the No. 13 rolling mill is provided with a double-row wheel guide, and the distance between two vertical wheels of the guide is 0.15-0.25mm greater than the height of a rolled piece after passing through the No. 12 rolling mill;
preferably, the width of the cutting hole of the No. 13 rolling mill is 90mm, and the width of the cutting hole of the No. 14 rolling mill is 94.46mm.
In an alternative embodiment, for two adjacent rolling mills in the roughing and intermediate rolling mill, the rolling current or torque of the former rolling mill is 2% -3% less than the rolling current or torque of the latter rolling mill when the latter rolling mill bites steel.
The beneficial effects of the embodiment of the invention include, for example:
the temperature difference between the upper surface and the lower surface of the rolled piece is controlled within 10 ℃ so as to ensure the uniformity of the temperature distribution from the upper surface to the lower surface of the rolled piece and reduce the possibility of bending the deformed steel bars.
The back-blowing air pipe is arranged in the water penetrating tank, so that water on the surface of the deformed steel bar can be dried, water drops are prevented from being concentrated on the lower surface of the deformed steel bar, and the temperature difference between the upper surface and the lower surface of the deformed steel bar is effectively controlled.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of the split holes of a 12# to 17# rolling mill.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The embodiment of the invention provides a method for controlling the bending degree of deformed steel bars, which comprises the following steps of:
smelting raw materials to obtain molten steel;
continuous casting, namely pouring the molten steel into a continuous casting machine to obtain a continuous casting blank;
heating, namely transferring the continuous casting blank into a heating furnace for heating to obtain a rolled piece, wherein the temperature difference between the upper surface and the lower surface of the rolled piece is less than 10 ℃;
rolling, namely rolling the rolled piece to obtain deformed steel bars;
the method comprises the steps of cooling, namely cooling screw steel by adopting a water penetrating tank, wherein the water penetrating tank is sequentially provided with a forward gas seal, a first water cooler, a first reverse water seal, a second water cooler, a second reverse water seal, a third water cooler, a third reverse water seal, a first reverse gas seal and a second reverse gas seal along the steel feeding-in-to-steel tapping direction;
shearing, namely shearing the cooled deformed steel bars by using a double-length shear;
an air inlet and an air outlet are arranged in the water penetrating tank between the third reverse water seal and the first reverse air seal, and a back-blowing air pipe facing the lower surface of the screw steel is connected to the air inlet;
and/or an air inlet and an air outlet are arranged in the water penetrating tank between the first reverse air seal and the second reverse air seal, and a back-blowing air pipe facing the lower surface of the screw steel is connected to the air inlet.
The blank is heated in a heating furnace, and the temperature of the blank is increased, so that the deformation resistance of the steel blank is reduced, the plasticity of the steel blank is improved, and the rough rolling large-reduction deformation is facilitated. When the heating system of the heating furnace is unreasonable, temperature difference between the upper surface and the lower surface, temperature difference between the head and the tail or temperature non-uniformity of the left side and the right side of a through strip generated when hot blank feeding and field cold blank alternately enter the furnace can be generated, and the rolled piece can be bent after being sheared by double-length shears, so that the temperature difference between the upper surface and the lower surface of the rolled piece which is discharged from the furnace is controlled within 10 ℃ so as to ensure the uniformity of temperature distribution from the upper surface to the lower surface of the rolled piece.
After the deformed steel bar passes through the three water coolers, a reverse water seal and two reverse air seals are arranged, and the surface of the deformed steel bar is reversely purged between a third reverse water seal and a first reverse air seal and/or between the first reverse air seal and a second reverse air seal, so that the purpose of cleaning cooling water stained on the surface of the deformed steel bar is achieved. If the water on the surface of the deformed steel bar cannot be removed, the lower surface of the rolled piece is provided with water under the action of gravity and the upper surface is anhydrous due to the transverse ribs after the deformed steel bar is discharged from the water tank, so that the temperature of the lower surface is low relative to that of the upper surface, the temperature difference between the upper surface and the lower surface can be increased, stress is generated, and the tail of the steel is bent towards the direction with low temperature after the steel bar is sheared by the double-length shear. Reverse blowing can effectively avoid bending of the deformed steel bars caused by uneven temperature of the upper surface and the lower surface. When the device is specifically arranged, the valve can be arranged on the reverse blowing pipe, the blowing flow can be adjusted, and the reverse blowing pressure is ensured to be enough to clean the water on the surface of the rolled piece. In addition, the temperature of the back-blowing air should be set as needed.
In other alternative embodiments of the present application, the strand outlet of the continuous casting machine and the strand inlet of the heating furnace are connected by a conveying device, and a heat-insulating cover is arranged on the conveying device.
In other optional embodiments of the present application, a feeding rack is arranged outside the continuous casting billet inlet of the heating furnace, and a heat insulation cover is arranged on the feeding rack.
In other alternative embodiments of the present application, the continuous casting machine further comprises a delivery trolley for transferring the continuous casting billet leaving the continuous casting machine into a loading rack or a heating furnace, wherein the delivery trolley is provided with a heat preservation cover.
The temperature non-uniformity generated by alternate feeding of cold and hot blanks is difficult to compensate in the heating system, so the problem can be improved by the following three measures: 1. a heat preservation cover is added between the heating furnace and the continuous casting machine, so that on one hand, heat dissipation of the continuous casting blank is reduced, and on the other hand, the temperature difference between the continuous casting blank and the conveying device is reduced, and the uniformity of the temperature of the continuous casting blank is improved; 2. the feeding racks are arranged, one or more feeding racks can be arranged according to the process requirement, the feeding racks can store red blank feeding when the steel rolling rhythm is slow and the process is stopped for a long time, and the heat dissipation can be reduced by arranging the heat preservation cover; 3. the flat car is arranged, and meanwhile, a flat car heat preservation device is additionally arranged on the flat car, so that the temperature of a continuous casting billet is reduced by more than 100 ℃ before the continuous casting billet leaves a continuous casting machine to enter a furnace. Through the transformation, the hot charging rate of the production line can be improved to 90% from the original 60%, the problem that the temperature of the steel billet charged into the furnace is low during production sequence is solved, and the charging of cold billets is reduced.
In other optional embodiments of the present application, a cooling water inlet and a cooling water outlet are all provided in the first water cooler, the second water cooler and the third water cooler, and the cooling water inlet is connected with a circular seam type nozzle with an adjustable circular seam size.
When the annular seam of the nozzle of the water cooler is smaller, the upper limit of the cooling capacity is easy to reach, when large-specification deformed steel bars are produced, the steel recovery temperature is higher, the mechanical property is too low, the water pressure in the water penetrating device is insufficient due to the lower water penetrating flow, the phenomenon that the rolled piece is unevenly cooled up and down to generate a sunny surface occurs, and the rolled piece is bent under the action of shearing force at a double-length shearing position; when the circumferential seam is larger, the water penetration flow is higher, a closed-loop tempered martensitic structure is easy to form, and the national standard requirement is not met. The nozzle with the adjustable circumferential seam is adopted, so that the circumferential seam is convenient to adjust according to the process conditions. During adjustment, the gap between the water gap and the circumferential seam of the water penetrating device is adjusted, so that the water flow of the circumferential seam is ensured to be equal.
The QTB (Quenehing Tempering Bars) technology generally adopts turbid circulating water cooling, which is easy to cause the situation that an annular cooling water gap is blocked by dirt, so that cooling water in a cooling water pipe is not full, steel passes through a nozzle, the upper surface and the lower surface are unevenly cooled, and the steel is also bent on an upper cooling bed. Therefore, impurities in the water penetrating device are cleaned during the maintenance period, so that the water penetrating device is ensured to be free of impurities, and the stability of the water penetrating process is ensured.
In other alternative embodiments of the present application, when the screw steel is sheared, the shearing blade of the multiple-length shearing machine moves in the same direction with the screw steel, and the ratio of the linear speed of the shearing blade of the multiple-length shearing machine to the linear speed of the screw steel is 1.10-1.15.
In other optional embodiments of the present application, when the tail of the tail section of the cut deformed steel bar is not bent, and the tail of the other sections are bent, the advance rate of the double-length shear is reduced;
when the head of the first section of the sheared deformed steel bar is not bent and the heads of the other sections are bent, the advance rate of the length-doubling shearing is increased.
The length doubling scissors are segmented scissors in front of a cooling bed on a rolled piece, the cutting edge speed of the length doubling scissors is set to be related to the speed of the rolled piece at the outlet of the last rolling machine, the linear speed of the length doubling scissors is slightly higher than the speed of the rolled piece at the outlet of the rolling machine, namely, a certain advance rate exists, the general set value is between 1.10 and 1.15, the set value is closely related according to the rolling linear speed, and when the rolling linear speed is increased or reduced, the advance rate of the length doubling scissors needs to be adjusted slightly. If the lead rate of the double-length shears is set to be too large, namely the linear speed of the shears is far greater than the linear speed of the rolled piece at the outlet of the final rolling machine, the tail part of the rolled piece at the front section after segmentation is easy to bend by the rotating shear blade, so that the tail part of the rolled piece is bent; if the advance rate of the double-length shear is set smaller, the head of the segmented second section of rolled piece can strike the shear blade to generate bent steel at the head of the rolled piece, and when the bent steel is severe, the skirt roller way is disordered.
In other optional embodiments of the present application, the rolling step adopts three-line splitting rolling, and the rolled piece passes through a pre-finish rolling device, wherein the pre-finish rolling device comprises a 4-frame 450 rolling mill and a 2-frame 350 rolling mill which are sequentially arranged, and the numbers are 11#, 12#, 13#, 14#, 15#, and 16#, respectively; wherein, the 12# rolling mill is a vertical rolling mill, and the other five frames are horizontal rolling mills; the 11# rolling mill adopts non-hole rolling, the 12# rolling mill hole is a box hole, the 13# rolling mill hole is a pre-cutting hole, the 14 rolling mill hole is a cutting hole, the 15# rolling mill hole is an elliptical hole, and the 16# rolling mill hole is a finished round hole; the width of the rolled piece entering the 11# rolling mill is 6-8mm larger than the height of the rolled piece entering the 12# rolling mill, and the height of the rolled piece entering the 11# rolling mill is matched with the width of the groove bottom of the cutting hole of the 12# rolling mill, as shown in fig. 1.
The line difference stability is the core of the splitting rolling technology, and when the line difference is stable, the outlet speeds of all the line rolled pieces are consistent, and the production is smooth; when the line difference is unstable, namely the outlet speeds of all the line rolled pieces are inconsistent, and when the rolled pieces reach the double-length shear, the speed of the rolled pieces with long line difference is high, and the line can possibly strike the shear blade to generate head bending; the speed of the rolled piece is low, and the wire can be impacted by the shearing blade to generate tail bent steel. Therefore, the pre-cutting guide position and the pre-cutting feed size are adjusted according to the length of the line difference, so that the line difference is ensured to be level.
The 11# rolling mill selects no hole type, the flat roller is characterized by being unlimited in expansion relative to the hole type roller, mainly comprises from expansion, has drum-shaped expansion at two sides, and is relatively small in elongation and reduction of area.
In order to meet the correction of the box hole of the 12# rolling mill of the next pass, the material width of the 11# rolling mill is 6-8mm higher than that of the 12# rolling mill. If the width of the material is too small, the pass on two sides is full and unsaturated when the rolled piece is cut by a No. 13 rolling mill, and the phenomenon that the line difference is long in the middle and short on two sides can occur. If the width of the material is too large, the head is easy to bend sideways, and even the steel pile is punched out. The material height of the 11# rolling mill is consistent with the width of the bottom of the box-shaped hole of the 12# rolling mill, and when the material height is too small, rolled pieces can roll diagonally in the box-shaped hole, so that the service life of the inlet of the 12# rolling mill is influenced.
In other alternative embodiments of the present application, the width of the black strip at the edge of the rolled piece is 70% -80% of the width of the rolled piece after the rolled piece passes through the 12# rolling mill; the 12# rolling mill cutting hole is a vertical box hole type with a certain side wall inclination, and aims to flush the drum-shaped expanding finishing generated in the K8 pass so as to provide a good condition for the next pre-cutting. In the actual production process, the rolling reduction of the 12# rolling mill needs to be strictly controlled, and if the rolling reduction is too small, the trimming effect cannot be achieved, and the rolling reduction is too large, so that irregular material type is easily caused by deformation of double drums at two sides, and the rolling stability is affected.
In the actual production process, the roller is cooled by using cooling water, the temperature of the roller is far lower than that of the rolled piece, the part of the rolled piece, which is deformed when in contact with the roller, can generate heat conduction, a black band which is different from an undeformed area can appear at the edge of the rolled piece, and the proportion of the black band width is more ideal in 70-80% when observed in the same horizontal line direction.
Preferably, the area of the middle hole of the cutting hole of the No. 13 rolling mill is 3-5% smaller than that of the holes at the two sides; the pre-cutting pass is an important factor for determining the metal flow in each hole pattern of the material distribution, is also the most direct factor influencing the line difference, and is difficult to adjust if the area of the three holes is designed to be as large when designing the pre-cutting holes; if the area of the side hole is designed to be too large, the two sides of the wire difference are too long to adjust, so the area of the middle hole is 3-5% smaller than that of the holes at the two sides. Fully considering the filling degree of the rolled piece in the hole type, when the rolled piece is not filled in the hole type, the side wall of the hole type has no supporting effect on the rolled piece, and the sizes of two sides of the rolled piece after cutting are fluctuated, so that the sizes of the two finished products are also randomly changed, and the three-line difference is difficult to control. The hole type abrasion is accelerated if the rolling reduction is too large; too little reduction increases the load on the rear rolling mill.
Preferably, the feeding side of the No. 13 rolling mill is provided with a double-row wheel guide, and the distance between two vertical wheels of the guide is 0.15-0.25mm greater than the height of a rolled piece after passing through the No. 12 rolling mill; the inlet of the No. 13 rolling mill uses double-row wheel guide, and in the actual control process, the space between the vertical wheels is about 0.2mm higher than the height of the No. 12 rolling mill, so that the rolled piece is allowed to move a little in the inlet of the No. 13 rolling mill. If the distance is too large, the 12# rolling mill inlet guide Wei Li wheel can not guide the rolled piece into the middle of the hole, so that the rolled piece is easy to deviate or twist and is not easy to control. If the distance is too small, the inlet guide Wei Lilun of the 12# rolling mill is stressed too much, and the service life of the inlet guide is shortened.
Preferably, for rolling the 18 # deformed steel bar, the cutting hole width of the 13# rolling mill is 90mm, and the cutting hole width of the 14# rolling mill is 94.46mm.
In the present application, a comparative example was set, and based on the foregoing example, the 13# rolling mill split hole width was 91.6mm, and the 14# rolling mill split hole width was 96.01mm.
The size of the cutting hole of the rolling mill has great influence on line difference, if the cutting hole is bigger, the line difference in the comparative example is expressed as long in the middle and short on two sides, in order to ensure the line difference to be even, post workers can receive too much small pre-cutting pass material types, so that the flow quantity of metal in the middle pass to two sides is increased, the cutting wedge is worn too fast, the situation that the middle is long and short on two sides can occur again due to the line difference, the operation workers can receive the small pre-cutting Kong Xingliao types continuously, so that vicious circle is formed, and the pass is not durable. In addition, the pre-cutting material is too large, and meanwhile, the subsequent pass is difficult to digest, the finished product is heavy, the negative deviation is difficult to control, and the production cost of ton steel is increased. The above embodiment effectively improves the sign of hole type durability and high negative deviation after resetting the parting hole. In other embodiments of the present application, the rolled piece passes through a rough rolling device and a middle rolling device in sequence before passing through a pre-finish rolling device, where the rough rolling device includes 6 rolling mills 650 which are sequentially arranged, and the numbers are 1#, 2#, 3#, 4#, 5#, and 6#, respectively. The middle rolling equipment comprises 4 frames 550 of rolling mills with serial numbers of 7# and 8# and 9# and 10# which are arranged in sequence.
In other alternative embodiments of the present application, the rolling current or torque of the former mill is 2% -3% less than the rolling current or torque of the latter mill for adjacent two mills in the roughing and intermediate mill installations when the latter mill bites the steel.
In actual control, when tension adjustment is poor, the line difference can show that the line difference of the first sections of multiple scales is larger, and the line difference of the last section of multiple scales is level. At this time, the frames with unequal second flow on the rolling line are required to be adjusted. The rough rolling and the medium rolling can be judged according to rolling current, namely, after the latter frame bites steel, the current (moment) of the frame is optimal when the current (moment) is 2% -3%. The tension of the pre-finish rolling and the finish rolling can be judged according to the condition that the rolled piece is in the looper, and when symmetrical radian exists between the looper wheel and the pinch roller, the tension state is good. If the rolled piece is changed into a straight line from a certain radian after the loop is sleeved, the situation that the set height of the loop is lower and steel pulling exists is indicated, the set height of the loop needs to be increased, and if the rolled piece is in a straight line during the loop lifting, the situation that the rotating speed of a previous rolling mill is lower is indicated, and the rotating speed of the previous rolling mill needs to be increased. When the steel is thrown on the second frame in front of the loop, the shaking of the rolled piece does not indicate that the tension state is good, and if the shaking of the rolled piece indicates that the tension is large, the former frame needs to be lifted up or the height of the loop needs to be increased. When the sectional area of the rolled piece is smaller and no loop exists, the rolled piece can be stirred by using a steel rod, the tension state is good when the rolled piece can be stirred easily, and when the rolled piece is stirred more forcefully, the fact that the front and rear rolling mills have larger tension is indicated, and the front frame needs to be accelerated.
The distance between the rear channel of the double-length shear and the double-length shear is also very important, the upper shearing blade of the rolled piece can give a downward force to the tail end of the front part of the rolled piece in the double-length shear shearing process, when the two parts are too far away, the tail of the rolled piece can strike the edge of the bottom plate of the rear channel of the double-length shear, so that the tail of the rolled piece is impacted and bent, and the rolled piece is characterized by larger bending degree and scratch trace at the bending position. If impact marks exist at the bending positions of the bending steel, whether the impact marks are caused by improper positions of the double-length scissors and the post-scissors channels or not is checked, and the impact marks are timely adjusted.
The production line of the factory is stopped for 212 minutes due to bending steel, forking steel and the like in 3-4 months; after 5-6 months, the method is utilized to control the bending degree of the deformed steel bars, the bending and forking of the deformed steel bars and other reasons, the downtime is 55 minutes, the month is saved by 78 minutes, the month is taken as an example with the machine hour yield of 200 tons, the month is extracted by 240 tons, the bending degree and the frequency of the deformed steel bars at the cooling bed are greatly reduced, the bending condition of the deformed steel bars of the cooling bed is obviously improved, and the unnecessary downtime is saved for production. In addition, the steel can be aligned at the alignment roller, so that a worker does not need to adjust bent steel to the original position, and the labor intensity of the worker is reduced. The cutting head is reduced from 400mm to below 100mm, and the yield is improved by 0.3%.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A method for controlling the bending of a deformed steel bar, comprising the following steps in sequence:
smelting raw materials to obtain molten steel;
continuous casting, namely pouring the molten steel into a continuous casting machine to obtain a continuous casting blank;
heating, namely transferring the continuous casting blank into a heating furnace for heating to obtain a rolled piece, wherein the temperature difference between the upper surface and the lower surface of the rolled piece is less than 10 ℃;
rolling, namely rolling the rolled piece to obtain deformed steel bars;
the method comprises the steps of cooling, namely cooling screw steel by adopting a water penetrating tank, wherein the water penetrating tank is sequentially provided with a forward gas seal, a first water cooler, a first reverse water seal, a second water cooler, a second reverse water seal, a third water cooler, a third reverse water seal, a first reverse gas seal and a second reverse gas seal along the steel feeding-in-to-steel tapping direction;
shearing, namely shearing the cooled deformed steel bars by using a double-length shear;
an air inlet and an air outlet are arranged in the water penetrating tank between the third reverse water seal and the first reverse air seal, and a back-blowing air pipe facing the lower surface of the screw steel is connected to the air inlet;
and/or an air inlet and an air outlet are arranged in the water penetrating tank between the first reverse air seal and the second reverse air seal, and a back-blowing air pipe facing the lower surface of the screw steel is connected to the air inlet.
2. The method for controlling bending of deformed steel bar according to claim 1, wherein the strand outlet of the continuous casting machine and the strand inlet of the heating furnace are connected by a transfer device, and the transfer device is provided with a heat-insulating cover.
3. The method for controlling bending of deformed steel bar according to claim 1, wherein a feeding rack is arranged at the outer side of a continuous casting billet inlet of the heating furnace, and a heat preservation cover is arranged on the feeding rack.
4. A method of controlling bending of a threaded steel according to claim 3, further comprising transferring the strand leaving the caster to a delivery trolley in a loading rack or a furnace, the delivery trolley having a heat retaining hood disposed thereon.
5. The method for controlling bending of deformed steel bar according to claim 1, wherein a cooling water inlet and a cooling water outlet are respectively arranged in the first water cooler, the second water cooler and the third water cooler, and the cooling water inlet is connected with a circular seam type nozzle with adjustable circular seam size.
6. The method of controlling bending of a screw-thread steel according to claim 1, wherein the cutting edge of the multiple-length scissors moves in the same direction as the screw-thread steel when the screw-thread steel is sheared, and the ratio of the linear velocity of the cutting edge of the multiple-length scissors to the linear velocity of the screw-thread steel is 1.10-1.15.
7. The method for controlling bending of a deformed steel bar according to claim 6, wherein when the tail of the tail section of the deformed steel bar after shearing is not bent, the advance rate of the double-length shearing is reduced when the tail of the rest sections are bent;
when the head of the first section of the sheared deformed steel bar is not bent and the heads of the other sections are bent, the advance rate of the length-doubling shearing is increased.
8. The method for controlling bending of deformed steel bar according to claim 1, wherein the rolling step is three-wire splitting rolling, and the rolled piece is passed through a pre-finishing rolling apparatus comprising a 4-frame 450 rolling mill and a 2-frame 350 rolling mill which are sequentially arranged, and the numbers are 11#, 12#, 13#, 14#, 15#, and 16#, respectively; wherein, the 12# rolling mill is a vertical rolling mill, and the other five frames are horizontal rolling mills; the 11# rolling mill adopts non-hole rolling, the 12# rolling mill hole is a box hole, the 13# rolling mill hole is a pre-cutting hole, the 14 rolling mill hole is a cutting hole, the 15# rolling mill hole is an elliptical hole, and the 16# rolling mill hole is a finished round hole; the width of the rolled piece entering the 11# rolling mill is 6-8mm larger than the height of the rolled piece entering the 12# rolling mill, and the height of the rolled piece entering the 11# rolling mill is matched with the width of the groove bottom of the cutting hole of the 12# rolling mill.
9. The method of controlling the bending of a deformed steel bar according to claim 8, wherein the width of the black strip at the edge of the rolled piece is 70-80% of the width of the rolled piece after the rolled piece passes through the 12# rolling mill;
preferably, the area of the middle hole of the cutting hole of the No. 13 rolling mill is 3-5% smaller than that of the holes at the two sides;
preferably, the feeding side of the No. 13 rolling mill is provided with a double-row wheel guide, and the distance between two vertical wheels of the guide is 0.15-0.25mm greater than the height of a rolled piece after passing through the No. 12 rolling mill;
preferably, the width of the cutting hole of the No. 13 rolling mill is 90mm, and the width of the cutting hole of the No. 14 rolling mill is 94.46mm.
10. A method of controlling bending of a deformed steel bar according to claim 8, wherein for adjacent two rolling mills in the roughing mill and the intermediate mill, the rolling current or torque of the former rolling mill is 2% -3% less than the rolling current or torque of the latter rolling mill when the latter rolling mill bites the steel.
CN202310146213.4A 2023-02-20 2023-02-20 Method for controlling bending degree of deformed steel bar Pending CN116159862A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310146213.4A CN116159862A (en) 2023-02-20 2023-02-20 Method for controlling bending degree of deformed steel bar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310146213.4A CN116159862A (en) 2023-02-20 2023-02-20 Method for controlling bending degree of deformed steel bar

Publications (1)

Publication Number Publication Date
CN116159862A true CN116159862A (en) 2023-05-26

Family

ID=86414461

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310146213.4A Pending CN116159862A (en) 2023-02-20 2023-02-20 Method for controlling bending degree of deformed steel bar

Country Status (1)

Country Link
CN (1) CN116159862A (en)

Similar Documents

Publication Publication Date Title
CN107695100A (en) A kind of steel exempt from heating and directly roll system and method
CN101391264A (en) Technique method of thin middle plate continuous casting and rolling production
CN106077091A (en) Low energy consumption hot continuous casting blank Direct Rolling shaped steel Bar Wire Product production method
CN110052495A (en) A kind of long material endless rolling production line of short route and its milling method
CN111389906A (en) Method and system for producing medium and large-sized bars
CN108941196B (en) Method for continuously rolling small-specification bar by using 200 large-section square billet
CN213162449U (en) Large and medium-sized bar production system
CN109158565A (en) A kind of continuous casting billet is quickly heat-fed process and device
CN1016762B (en) Method and device for rolling continuous casting sections
CN101829678A (en) Method for endless rolling of sectional material and rod and wire material and flexible connecting device thereof
CN102294356B (en) The method and apparatus of casting and continuous rolling for manufacturing elongated metal rolled products
CN105817487B (en) The control method of bearing Steel Bar net carbide and the device for implementing this method
AU717049B2 (en) Copper cathode starting sheets
CN111438188B (en) Long material direct rolling casting blank heat preservation device, production line and method
CN201150982Y (en) Wedge-shaped casting blank online cutting equipment
CN210253551U (en) Short-flow endless rolling production line for long materials
CN116159862A (en) Method for controlling bending degree of deformed steel bar
CN102310078B (en) Continuous-casting continuous-rolling method for producing sectional materials and bar-wire materials by using residual heat of molten steel
CN112090960A (en) Method for producing 400-500 MPa high-strength anti-seismic deformed steel bar by non-heating low-temperature slitting rolling
CN111872114A (en) High-yield high-precision slitting bar production method and production line
CN215614062U (en) Economical process arrangement of welding endless rolled bar production line
CN102343358B (en) For the manufacture of the casting of elongated metal rolled products and continuous rolling method and equipment
CN1475314A (en) No heating processing method in bar steel continuous casting and continuous rolling process
CN111282993A (en) Near-net shape rail blank short-flow continuous casting and rolling production method and system
CN209476915U (en) A kind of aluminium alloy rod continuous casting and continuous rolling mill

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination