CN112090957A - Preparation method of high-ductility cold-rolled ribbed steel bar - Google Patents
Preparation method of high-ductility cold-rolled ribbed steel bar Download PDFInfo
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- CN112090957A CN112090957A CN202010918823.8A CN202010918823A CN112090957A CN 112090957 A CN112090957 A CN 112090957A CN 202010918823 A CN202010918823 A CN 202010918823A CN 112090957 A CN112090957 A CN 112090957A
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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
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
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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
- B21B39/002—Piling, unpiling, unscrambling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
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- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Metal Rolling (AREA)
Abstract
The invention provides a preparation method of a high-ductility cold-rolled ribbed steel bar, which comprises an unreeling step, a cold rolling step, a heat treatment step and a reeling step, and is characterized in that the cold rolling step comprises three times of active rolling, the tempering temperature of the heat treatment step is 540-630 ℃, and a warm rolling forming step by utilizing the heat energy of the heat treatment step is arranged between the heat treatment step and the reeling step. The preparation method adopts a production process combining active rolling and online tempering, the product has good ductility and high strength, a layer of rust-proof oxide film can be formed on the surface, the rust-proof capability is good, the steel bar is full and uniform, and the reinforcement bar reinforcement wrong-fixation performance is improved; the tensile strength of the produced steel bar is obviously higher than that of the common ribbed steel bar, and the using amount of the steel bar can be saved in the application of construction engineering; the steel bar is particularly suitable for reinforcing bars of plate members and stressed main bars of medium and small prestressed members, can replace plain-faced cold-drawn low-carbon steel wires, and does not generate cracks on the surface of a bent part when a cold-rolled ribbed steel bar is bent.
Description
Technical Field
The invention mainly relates to the related technical field of steel bar preparation, in particular to a preparation method of a high-ductility cold-rolled ribbed steel bar.
Background
The cold-rolled ribbed steel bar is a crescent steel bar with two or three surfaces formed by hot-rolled wire rods through multiple cold-rolling reducing, rib pressing and internal stress elimination, and has low elongation.
The requirement for the elongation of the steel bar in various projects is gradually improved, but the process for producing the high-ductility cold-rolled ribbed steel bar by most domestic manufacturers is complicated, the operation is complex, the production period is long, the elongation of the steel bar is still low, and the engineering requirement cannot be met.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a method for manufacturing a high-ductility cold-rolled ribbed steel bar, the high-ductility cold-rolled ribbed steel bar manufactured by the method has a tensile strength significantly higher than that of a common ribbed steel bar, a product has good ductility and high strength, the amount of steel bar used can be saved in construction engineering applications,
the invention is realized by the following technical scheme:
a preparation method of a high-ductility cold-rolled ribbed steel bar comprises an unreeling step, a cold rolling step, a heat treatment step and a reeling step, wherein the cold rolling step comprises three times of active rolling, the tempering temperature of the heat treatment step is 540-630 ℃, and a warm rolling forming step by utilizing the heat energy of the heat treatment step is included between the heat treatment step and the reeling step.
Further, the unreeling step comprises a feeding step, a butt welding step and a phosphorus removal step.
Further, the rolling step comprises a diameter measuring step, a low-temperature spinning step, a coil collecting and dividing step, a packing and weighing inspection step and a coil unloading finished product warehousing step.
Furthermore, a twist-free pay-off system is adopted in the unreeling step, and the number of the twist-free pay-off systems is multiple.
Furthermore, the rolling mills adopted in the cold rolling step are 4 active rolling mills, and the stand of each active rolling mill corresponds to one rolling mill module.
Furthermore, the driving rolling mill is a cantilever rolling mill, the maximum rolling speed is 1000m/min, the driving rolling mill comprises a roll collar and a roll box, the specification of the roll collar is 263mm, the roll box is arranged at an angle of 45 degrees with the ground, and the driving rolling mill adopts an insertion type structure.
Further, a medium-frequency induction heating furnace is adopted in the heat treatment step, the external dimension of the medium-frequency induction heating furnace is 13000mm multiplied by 1000mm multiplied by 1360mm, and the medium-frequency induction heating furnace comprises 3 heating elements with high power of more than 700KW of monomer power.
Further, the medium-frequency induction heating furnace comprises a heating coil, a copper pipe, a heat-resistant insulating ceramic pipe and a guide wheel set, wherein the heating coil is a hollow rectangular copper pipe, the copper pipe is cooled by softened circulating water, the heat-resistant insulating ceramic pipe is adopted between the copper pipe and a reinforcing steel bar, and the guide wheel set is arranged between the heating coils; and an infrared pyrometer is arranged at an outlet of the medium-frequency induction heating furnace.
The invention has the beneficial effects that:
(1) the high-ductility cold-rolled ribbed steel bar adopts a production process combining three times of active rolling and heat treatment-online annealing, the product has good ductility and high strength, a layer of rust-proof oxide film can be formed on the surface, the rust-proof capability is good, the steel bar is high, full and uniform, and the reinforcement reinforcing bar reinforcing property is improved.
(2) The tensile strength of the high-ductility cold-rolled ribbed steel bar prepared by the method is obviously higher than that of the common ribbed steel bar, and the using amount of the steel bar can be saved in the application of construction engineering.
(3) The high-ductility cold-rolled ribbed steel bar prepared by the method is particularly suitable for reinforcing bars of plate members and stress main bars of medium and small prestressed members, can replace smooth-surface cold-drawn low-carbon steel wires, and does not generate cracks on the surface of a bent part when the cold-rolled ribbed steel bar is bent.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The preferred mechanisms and methods of motion realization of the present invention are further described below in conjunction with the figures and the detailed description.
Example 1
A preparation method of a high-ductility cold-rolled ribbed steel bar comprises the following steps:
(1) feeding: the Q235 low-carbon steel hot-rolled wire rod is used as a raw material, a raw material coil is hung on a vacant core rod of a pay-off machine by a crane, the coil on the core rod is horizontally turned to a vertical pay-off station under the action of a hydraulic oil cylinder, and the actions can be repeated if multiple times of feeding are needed. The wire-preventing machine adopted in the step adopts a twisting-free paying-off system, and the number of the wire-preventing machines can be multiple.
(2) And (4) butt welding: the tail end of the previous coil of steel bar raw material and the beginning of the next coil of steel bar raw material are connected and fixed by a welding method, so that the trouble of frequently exchanging steel coils is avoided.
(3) And (3) dephosphorization: the steel bar on the raw material coil can form a layer of oxide skin on the surface of the steel bar due to the contact with air and water, the content of the oxide skin in the raw material is about 4.5 percent through detection, the main components of the oxide skin are FeO, Fe304 and Fe2O3, the content ratio of the FeO, the Fe304 and the Fe2O3 is about 7: 3: 1, and the oxide skin on the surface of the steel bar needs to be removed to ensure the product quality. The method comprises the following steps that the raw material disc is straightened by a feeding die and then enters the phosphorus removing machine to be bent and phosphorus removed under the guiding action of a feeding guide wheel, phosphorus is removed by adopting a bending roller mode, namely a mechanical friction mode, the bent phosphorus removing part in the phosphorus removing machine is arranged in a closed space, and a special guide pipe is arranged in the closed space so as to lead oxide skin into an oxide skin storage box on the lower side. The descaling efficiency of the mechanical bending is about 99%.
(4) Cold rolling: and after removing phosphorus, the steel bars enter a rolling mill for rolling through the guide groove, and the rolling mill processes the steel bars through three times of active rolling. The three-pass active rolling is different from the most traditional one-pass active rolling and two-pass passive rolling, the traditional one-pass active rolling can be operated to drive the rollers of the rolling mill to move, the two-pass passive rolling is realized by driving the rollers to move depending on the movement of materials on the rollers, the invention adopts the three-pass active rolling, and the rollers of the rolling mill all actively move, so that the steel bar core part can be subjected to compressive stress, and the compressive stress can make the steel produce great plastic deformation, thereby improving the yield point of the steel and improving the performance of the steel. The rolling mill adopts 4 active rolling mills, one stand corresponds to one rolling mill module, but a motor is adopted to directly drive a cone box of each active rolling mill. The rolling mill is a cantilever rolling mill, the maximum rolling speed is 1000m/min, the specification of a roll collar is 263mm, and a roll box is arranged at an angle of 45 degrees with the ground. A loop is arranged between the rolling mills, and the loop realizes micro-tension rolling between the two frames according to the loop quantity. The rolling mill is provided with a rolling guide so as to ensure the centering of a rolled piece, and the roll collar arranged on the rolling mill is used for compressed air purging, roll collar cooling and roll groove cleaning. Protective covers are arranged at the front and the rear of the rolling mill, and the protective covers form a closed space, so that a rolled piece is prevented from penetrating out to hurt people when the rolling mill starts.
(5) Heat treatment-on-line annealing: and (4) carrying out on-line annealing heat treatment on the cold-rolled steel bar in an induction heating furnace. In order to meet the requirement of high-speed rolling, a medium-frequency induction heating furnace is adopted in the step, the external dimension of the medium-frequency induction heating furnace is 13000mm multiplied by 1000mm multiplied by 1360mm, the medium-frequency induction heating furnace comprises 3 high-power heating elements with the monomer power of more than 700KW, the heat treatment temperature is adjusted according to the specification and the actual measurement performance, and the temperature is 540 ℃. The induction heating furnace adopts an efficient inverse transformation tapping technology (namely a technology for achieving the purpose of saving electricity by adjusting power) to improve the heating efficiency. An infrared pyrometer is arranged at an outlet of the induction heating furnace to monitor the heat treatment temperature in real time, and the heat treatment temperature is adjusted through an HIMI picture modification formula and an adjusting button.
(6) Warm rolling and forming: the steel bar raw material is subjected to forming rolling in one pass after passing through the induction heating furnace, the heat energy is fully utilized, the rolling deformation rate of the steel bar can be matched to the maximum extent, and the rolling strengthening effect is exerted. The steel bar raw material is rolled to form crescent transverse ribs and longitudinal ribs on two sides. Compared with cold rolling, warm rolling forming enables the reinforcing steel bars to be concentrated in a ferrite area to deform, and the elongation and the toughness of the steel are improved.
(7) And (3) diameter measurement: and a thread diameter measuring instrument is arranged behind the rolling mill, the diameter measuring instrument adopts a high-precision multi-channel laser dynamic imaging thread detection technology, a specially developed cold-rolled deformed steel bar data processing algorithm is used, data such as transverse rib height, longitudinal rib height, base circle, single weight and the like are displayed on line in real time, and the real-time thread detection technology realizes on-line quality control.
(8) Low-temperature spinning: the steel bars after heat treatment are sequentially sent into a pinch roll and a wire-feeding machine, a steel pouring device is arranged at the outlet of the wire-feeding machine, the steel bars with the temperature lower than 500 ℃ are bent into a roll shape at high speed through the cooperation of the pinch roll, the wire-feeding machine and the steel pouring device, the steel bars are stacked on a conveying roller way according to the sequence of steel bar rolling, and the steel bars after wire feeding are circularly conveyed to a coil collecting station for coil collection through the conveying roller way. The size of the laying steel bar coil is adjusted by the speed of the laying head, and the speed adjustment of the laying head is realized by modifying the speed leading coefficient operation speed master command of the laying head through HIMI pictures. The speed change of the laying head not only influences the diameter of the laying steel bar coil, but also influences the placement position of the laying steel bar coil on the conveying roller way, and the laying head is deviated to the left side when the speed is high, otherwise, the laying head is deviated to the other side. In order to realize that the reinforcing steel bars enter the collecting drum at the middle position of the conveying roller way and achieve the effect of improving the collecting and winding quality, the speed of the laying head and the straightening guide wheel on the conveying roller way are adjusted according to the field condition.
(9) Collecting and dividing rolls: the roll-shaped reinforcing steel bars are continuously conveyed to a coil collecting station by the conveying roller way in the previous process, and the reinforcing steel bars fall into the coil collecting device and are sleeved on the nose cone of the coil collecting device. In the process of coiling, a weighing sensor is arranged on the lifting tray, the weight of the steel bar coil can be detected in real time, once the weight of the steel bar coil reaches a set value, the lifting tray descends in an accelerated manner to pull open a coil gap, and the hydraulic coil splitting shear acts to complete coil splitting. The nose cone, the separating claw, the winding collecting drum, the winding splitting scissors, the lifting tray, the movable bracket, the lifting device and other equipment of the winding collecting device act together to complete the functions of winding, collecting and winding, shaping, weight fixing and winding splitting.
(10) Packaging, weighing and checking: the steel bar coil which is completed with the coil collection is placed on the movable bracket, is sent to a semi-automatic packing machine and a movable packing machine after being sampled and inspected by a PF line through a coil transport vehicle along a ground roller line, the movable bracket is lifted and positioned by a packing machine center device, and the compaction device and the packing head act to complete actions such as coil compaction, wire threading, wire winding and twisting, and the like, so that the coil packing is completed. The packing machine compaction device and the packing head return to the original positions, the central device descends, the ground roller line stops conveying the packed coil to the weighing station, weighing, checking and listing are carried out, secondary checking is carried out on the fixed weight result of the coil collecting station, and basis is provided for product warehousing.
(11) Coil unloading and finished product warehousing: and weighing the packed steel bar coil, conveying the weighed steel bar coil to an uncoiling station, and lifting a U-shaped hook on a hanger by an uncoiling trolley to separate the U-shaped hook from the steel bar coil. The platform surface of the coil stripping trolley descends to the original position and moves to the outside of the PF line, and the coil stripping trolley upper coil screws are lifted by a crown block to enter a finished product storage area and placed on a designated cargo space.
Example 2
The high ductility cold rolled ribbed bar of this example was prepared similar to example 1 except that the heat treatment temperature was 600 ℃.
Example 3
The high ductility cold rolled ribbed bar of this example was prepared similar to example 1 except that the heat treatment temperature was 630 ℃.
Finally, it should be noted that: although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (8)
1. A preparation method of a high-ductility cold-rolled ribbed steel bar comprises an unreeling step, a cold rolling step, a heat treatment step and a reeling step, and is characterized in that the cold rolling step comprises three times of active rolling, the tempering temperature of the heat treatment step is 540-630 ℃, and a warm rolling forming step by utilizing the heat energy of the heat treatment step is included between the heat treatment step and the reeling step.
2. The method for preparing the high-ductility cold-rolled ribbed steel bar according to claim 1, wherein the unreeling step includes a feeding step, a butt welding step and a phosphorus removal step.
3. The method for preparing the high-ductility cold-rolled ribbed steel bar according to claim 1, wherein the rolling step comprises a diameter measuring step, a low-temperature wire laying step, a coil collecting and dividing step, a packing and weighing inspection step and a coil unloading finished product warehousing step.
4. The method for preparing a high-ductility cold-rolled ribbed steel bar as claimed in claim 1, wherein a twist-free pay-off system is adopted in the unwinding step, and the twist-free pay-off system is multiple.
5. The method of claim 1, wherein the rolling mills used in the cold rolling step are 4 active rolling mills, and each active rolling mill has a stand corresponding to one rolling mill module.
6. The method of claim 5, wherein the driving rolling mill is a cantilever rolling mill having a maximum rolling speed of 1000m/min, the driving rolling mill includes a roll collar of 263mm gauge and a roll box set at 45 ° to the ground, and the driving rolling mill is of a plunge construction.
7. The method for preparing a high ductility cold rolled ribbed bar as claimed in claim 1, wherein the heat treatment step employs a medium frequency induction heating furnace, the external dimension of the medium frequency induction heating furnace is 13000mm x 1000mm x 1360mm, and the medium frequency induction heating furnace comprises 3 heating elements with a single power of 700KW or more.
8. The method for preparing the high-ductility cold-rolled ribbed steel bar according to claim 1, wherein the medium-frequency induction heating furnace comprises a heating coil, a copper pipe, a heat-resistant insulating ceramic pipe and a guide wheel group, the heating coil is a hollow rectangular copper pipe, the copper pipe is cooled by softened circulating water, the heat-resistant insulating ceramic pipe is adopted between the copper pipe and the steel bar, and the guide wheel group is arranged between the heating coils; and an infrared pyrometer is arranged at an outlet of the medium-frequency induction heating furnace.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010918823.8A CN112090957A (en) | 2020-09-03 | 2020-09-03 | Preparation method of high-ductility cold-rolled ribbed steel bar |
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| CN202010918823.8A CN112090957A (en) | 2020-09-03 | 2020-09-03 | Preparation method of high-ductility cold-rolled ribbed steel bar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115488147A (en) * | 2022-09-15 | 2022-12-20 | 马鞍山延隆新材料科技有限公司 | Multi-pass low-temperature rolling method for high-ductility cold-rolled ribbed steel bar |
Citations (5)
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|---|---|---|---|---|
| CN2297259Y (en) * | 1994-11-16 | 1998-11-18 | 陆燮明 | Production technology and equipment for cold-rolling ribbed reinforcing bar roller |
| CN102212667A (en) * | 2011-05-05 | 2011-10-12 | 安阳市合力高速冷轧有限公司 | Production process of high-ductility cold-rolled ribbed steel bars |
| CN102382950A (en) * | 2011-11-08 | 2012-03-21 | 建科机械（天津）股份有限公司 | Conductive wheel electric heating device for cold-rolled ribbed steel bar production line |
| CN107185995A (en) * | 2017-07-20 | 2017-09-22 | 四川桂利节能科技有限公司 | A kind of cold rolled reinforcing steel bar with ribs processing technology |
| CN109877155A (en) * | 2019-03-26 | 2019-06-14 | 巩义市金迪冶金设备有限公司 | A kind of high ductility cold-rolled ribbed bars production technology |
-
2020
- 2020-09-03 CN CN202010918823.8A patent/CN112090957A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| CN2297259Y (en) * | 1994-11-16 | 1998-11-18 | 陆燮明 | Production technology and equipment for cold-rolling ribbed reinforcing bar roller |
| CN102212667A (en) * | 2011-05-05 | 2011-10-12 | 安阳市合力高速冷轧有限公司 | Production process of high-ductility cold-rolled ribbed steel bars |
| CN102382950A (en) * | 2011-11-08 | 2012-03-21 | 建科机械（天津）股份有限公司 | Conductive wheel electric heating device for cold-rolled ribbed steel bar production line |
| CN107185995A (en) * | 2017-07-20 | 2017-09-22 | 四川桂利节能科技有限公司 | A kind of cold rolled reinforcing steel bar with ribs processing technology |
| CN109877155A (en) * | 2019-03-26 | 2019-06-14 | 巩义市金迪冶金设备有限公司 | A kind of high ductility cold-rolled ribbed bars production technology |
Non-Patent Citations (1)
| Title |
|---|
| 李军红: "冷轧带肋钢筋工艺的现代优化方法及质量控制", 中国博士学位论文全文数据库 工程科技Ⅰ辑, no. 06, pages 99 - 101 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115488147A (en) * | 2022-09-15 | 2022-12-20 | 马鞍山延隆新材料科技有限公司 | Multi-pass low-temperature rolling method for high-ductility cold-rolled ribbed steel bar |
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