CN113333484A - Technological method for improving phenomenon of shearing bend of bar hot-rolled ribbed steel bar - Google Patents
Technological method for improving phenomenon of shearing bend of bar hot-rolled ribbed steel bar Download PDFInfo
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- CN113333484A CN113333484A CN202110585440.8A CN202110585440A CN113333484A CN 113333484 A CN113333484 A CN 113333484A CN 202110585440 A CN202110585440 A CN 202110585440A CN 113333484 A CN113333484 A CN 113333484A
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- shearing
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- ribbed steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0224—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars
-
- 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
- B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B43/00—Cooling beds, whether stationary or moving; Means specially associated with cooling beds, e.g. for braking work or for transferring it to or from the bed
-
- 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
- B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
- B21B2015/0021—Cutting or shearing the product in the rolling direction
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a process method for improving the phenomenon of shearing bend of a bar hot-rolled ribbed steel bar, which comprises the following steps of firstly cooling the surface temperature of the bar hot-rolled ribbed steel bar; then carrying out fixed-length shearing on the bar hot-rolled ribbed steel bar; finally, cooling the shearing part of the bar hot-rolled ribbed steel bar. The invention can not only prevent the bar hot-rolled ribbed steel bar from forming a tempered martensite structure, but also obviously improve the phenomenon of shearing an elbow of the hot-rolled ribbed steel bar.
Description
Technical Field
The invention relates to the field of steel production processes, in particular to a process method for improving the phenomenon of shearing bends of hot-rolled ribbed steel bars of bars.
Background
The new national standard of hot-rolled ribbed steel bars has stricter requirements on quality, wherein the influence on the performance of steel products is larger, the metallographic structure of the steel bars mainly comprises ferrite and pearlite, and tempered martensite structures do not appear on a base circle. The strength and hardness of metal can be reduced along with the rise of temperature, the molding can be raised along with the rise of temperature, the temperature of the steel bar at the position of the fixed-length shear is raised due to process change, the hardness of the steel bar is reduced, the deformation resistance is small, the end part is easy to bend downwards to form a steel bar elbow, and the quality of the steel bar is seriously influenced. At present, the engineering construction process and the quality are improved by generally adopting a threading process, if the end part of a reinforcing steel bar is provided with an elbow and needs to be straightened, the threading processing is inconvenient, the construction progress is influenced, the product sale is adversely affected, the shearing elbow needs to be manually rejected in the production link, the batch judgment of waste products is caused, the enterprise benefit is seriously affected, and the serious waste of resources is caused. The difficulty of improving the shearing elbow mainly lies in how to solve the problem that tempered martensite structures do not appear while the temperature of a steel bar shearing part is reduced.
Disclosure of Invention
The invention aims to provide a process method for improving the phenomenon of shearing bends of hot-rolled ribbed bars of bars, and the process method is used for solving the problem that the shearing bends are easy to appear at the shearing parts after the bars are sheared in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a technological method for improving the phenomenon of shearing an elbow of a hot-rolled ribbed steel bar of a bar is used for improving the material performance of a shearing part in the fixed-length shearing process of the hot-rolled ribbed steel bar of the bar and is characterized in that: firstly, naturally cooling the surface temperature of the bar hot-rolled ribbed steel bar to be below 400 ℃; then spraying the spray liquid with the water pressure of more than or equal to 0.4MPa and the temperature of less than or equal to 40 ℃ to the shearing part of the bar hot-rolled ribbed steel bar until the temperature of the shearing part of the bar hot-rolled ribbed steel bar is reduced to 100-200 ℃, and finally carrying out fixed-length shearing segmentation on the bar hot-rolled ribbed steel bar.
The process method for improving the phenomenon of bend shearing of the hot-rolled ribbed steel bar of the bar is characterized by comprising the following steps of: the bar hot-rolled ribbed steel bar is obtained by heating and rolling a square billet.
The process method for improving the phenomenon of bend shearing of the hot-rolled ribbed steel bar of the bar is characterized by comprising the following steps of: the bar hot-rolled ribbed steel bar adopts a natural cooling mode to cool the surface temperature to be below 400 ℃.
The process method for improving the phenomenon of bend shearing of the hot-rolled ribbed steel bar of the bar is characterized by comprising the following steps of: and shearing the unqualified part of the head of the bar hot-rolled ribbed steel bar at first during fixed-length shearing, and shearing the bar hot-rolled ribbed steel bar according to the fixed length to obtain a plurality of bar hot-rolled ribbed steel bar segments.
The process method for improving the phenomenon of bend shearing of the hot-rolled ribbed steel bar of the bar is characterized by comprising the following steps of: the temperature of the shearing part of the bar hot-rolled ribbed steel bar is reduced to 100-200 ℃ by adopting a spraying mode.
The process method for improving the phenomenon of bend shearing of the hot-rolled ribbed steel bar of the bar is characterized by comprising the following steps of: when spraying, spraying liquid with the water pressure of more than or equal to 0.4MPa and the temperature of less than or equal to 40 ℃ to the shearing part of the bar hot-rolled ribbed steel bar until the temperature of the shearing part of the bar hot-rolled ribbed steel bar is reduced to 100-200 ℃.
The process method for improving the phenomenon of bend shearing of the hot-rolled ribbed steel bar of the bar is characterized by comprising the following steps of: the temperature of the shearing part of the bar hot-rolled ribbed steel bar is reduced to 100-200 ℃.
In the invention, after a square billet is heated and rolled to obtain a bar hot-rolled ribbed steel bar, the bar hot-rolled ribbed steel bar is naturally cooled to below 400 ℃; then, carrying out fixed-length shearing on the bar hot-rolled ribbed steel bar so as to remove the unqualified part of the head and carry out fixed-length segmentation; after cutting to length, spraying the cutting part to reduce the temperature of the cutting part to 100-200 ℃. Therefore, the temperature of the shearing part can be reduced, the shearing elbow is avoided, and the phenomenon of tempered martensite structure is avoided.
According to the principle of the transformation of a metallurgical iron-carbon alloy phase diagram, namely the TMCP process principle, the martensite structure is formed by heating steel to an austenite state, and then rapidly cooling the steel to a temperature below the Ms point at a cooling speed higher than the critical cooling speed, so that the martensite is formed under the conditions of a certain cooling speed and deep supercooling (lower than the Ms point), and according to practical experience and process data statistics, when the surface temperature of a steel bar is higher than 450 ℃, the rapid cooling is easy to generate a tempered martensite structure, so that the invention requires that the natural cooling of the hot-rolled ribbed steel bar of the bar is reduced to below 400 ℃, and then the spray cooling is carried out on the shearing part of the steel bar to 100-plus 200 ℃.
Compared with the prior art, the invention has the advantages that:
by adopting the scheme, after the steel bars are naturally cooled by the cooling bed, the surface temperature is reduced to be below 400 ℃, then the automatic spraying device is started to spray and cool the shearing surface, and the temperature of the shearing surface is reduced to 100-plus-200 ℃, so that the tempered martensite structure formed by the hot-rolled ribbed steel bars of the bars can be avoided, the phenomenon of shearing elbows of the hot-rolled ribbed steel bars can be obviously improved, and the batch judgment of waste products can be reduced. By adopting the invention, the hot-rolled ribbed steel bar is not bent after being cut to length, and simultaneously, tempered martensite structure does not appear, thereby solving the problems in the prior art.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in FIG. 1, the process for improving the shear bend phenomenon of the hot rolled ribbed steel bar of the bar comprises the following steps:
step 1, heating and rolling the square billet to obtain the bar hot-rolled ribbed steel bar.
And 2, naturally cooling the surface temperature of the hot-rolled ribbed steel bar of the bar to be lower than 400 ℃, wherein the upper limit temperature value is 400 ℃.
Step 3, carrying out fixed-length shearing on the bar hot-rolled ribbed steel bar; and shearing the unqualified part of the head of the bar hot-rolled ribbed steel bar at first during fixed-length shearing, and shearing the bar hot-rolled ribbed steel bar according to the fixed length to obtain a plurality of bar hot-rolled ribbed steel bar segments.
And 4, spraying spray liquid to the shearing part to reduce the temperature of the shearing part of the bar hot-rolled ribbed steel bar to 100-200 ℃ and the optimal upper limit temperature is 200 ℃.
When spraying, spraying liquid with the water pressure of more than or equal to 0.4MPa and the temperature of less than or equal to 40 ℃ to the shearing part of the bar hot-rolled ribbed steel bar until the temperature of the shearing part of the bar hot-rolled ribbed steel bar is reduced to 100-200 ℃.
Example 1
The technological method for improving the shearing elbow of the hot-rolled ribbed steel bar (phi 25 steel bar for short) with the phi 25 specification of the bar comprises the following steps:
(1) selecting a square billet as a blank, heating and rolling to produce a phi 25 steel bar, setting the delivery length to be 9m and the length of the phi 25 steel bar on a cooling bed to be 109m times of length according to the requirements of customers, and conveying the phi 25 steel bar to an output roller bed through the cooling bed;
(2) phi 25 steel bars with the length of multiple length of 109m are driven by an output roller way motor to drive an output driving roller to move towards the direction of the fixed length shear;
(3) when the phi 25 steel bar head with the multiple length of 109m passes over the shear blade of the fixed length shear by 0.5m, the run-out roller stops moving;
(4) the fixed-length shearing and pressing device is pressed downwards, the upper shearing edge moves downwards, unqualified reinforcing steel bars of 0.5m are sheared off, and meanwhile, the automatic spraying device is started; the automatic spraying device is arranged at a position 9m away from the center line of the shear blade of the fixed-length shear, the water pressure is set to be 0.4MPa, the spraying radius of the nozzle is set to be 75mm, the position of the double-length material 9m away from the shear blade of the fixed-length shear is sprayed, and the temperature of the shear surface of the steel bar is reduced to be below 200 ℃;
(5) after the shearing is finished, the upper shearing edge of the fixed-length shear is lifted, the material pressing roller is lifted, and the automatic spraying device stops running;
(6) the phi 25 steel bars continue to be conveyed through the output roller way and stop when the phi 25 steel bars cross the shear blades by 9 m.
(7) And (4) repeating the steps (4) to (6) until the phi 25 steel bars are all cut to 9m fixed length, and the unqualified part with the tail part of 0.5m is cut off.
(8) And (5) repeating the steps (1) to (6) to obtain the phi 25 hot-rolled ribbed steel bar with the length of 9m required by a customer.
Example 2
The technological method for improving the shearing elbow of the phi 12 specification hot-rolled ribbed steel bar (called phi 12 steel bar for short) of the bar comprises the following steps:
(1) selecting a square billet as a blank, heating and rolling to produce a phi 12 steel bar, setting the delivery length to be 9m and the length of a cooling bed on the phi 12 steel bar to be 109m times of length according to the requirements of customers, and conveying the steel bar to an output roller bed through the cooling bed;
(2) phi 12 steel bars with the length of multiple length of 109m are driven by an output roller way motor to drive an output driving roller to move towards the direction of the fixed length shear;
(3) when the phi 12 steel bar head with the multiple length of 109m passes over the shear blade of the fixed length shear by 0.5m, the run-out roller stops moving;
(4) the fixed-length shearing and pressing device is pressed downwards, the upper shearing edge moves downwards, unqualified reinforcing steel bars of 0.5m are sheared off, and meanwhile, the automatic spraying device is started; the automatic spraying device is arranged at a position 9m away from the center line of the shear blade of the fixed-length shear, the water pressure is set to be 0.4MPa, the spraying radius of the nozzle is set to be 150mm, the position of the double-length material 9m away from the shear blade of the fixed-length shear is sprayed, and the temperature of the shear surface of the steel bar is reduced to be below 150 ℃;
(5) after the shearing is finished, the upper shearing edge of the fixed-length shear is lifted, the pressure roller is lifted, and the automatic spraying device is stopped;
(6) the phi 12 steel bars continue to be conveyed through the run-out roller way and stop when the phi 12 steel bars cross the shear blades by 9 m.
(7) And (4) repeating the actions (4) to (6) until the phi 12 steel bars are all cut to 9m fixed length, and the unqualified part with the tail part of 0.5m is cut off.
(8) And (5) repeating the steps (1) to (6) to obtain the phi 12 hot-rolled ribbed steel bar with the length of 9m required by a customer.
The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, and the technical content of the present invention which is claimed is fully set forth in the claims.
Claims (7)
1. A technological method for improving the phenomenon of shearing an elbow of a hot-rolled ribbed steel bar of a bar is used for improving the material performance of a shearing part in the fixed-length shearing process of the hot-rolled ribbed steel bar of the bar and is characterized in that: firstly, cooling the surface temperature of a bar hot-rolled ribbed steel bar to be below 400 ℃; then, carrying out fixed-length shearing on the bar hot-rolled ribbed steel bar; finally, the temperature of the shearing part of the bar hot-rolled ribbed steel bar is reduced to 100-200 ℃.
2. The process method for improving the shearing elbow phenomenon of the hot-rolled ribbed steel bars of the bars according to claim 1, characterized by comprising the following steps: the bar hot-rolled ribbed steel bar is obtained by heating and rolling a square billet.
3. The process method for improving the shearing elbow phenomenon of the hot-rolled ribbed steel bars of the bars according to claim 1, characterized by comprising the following steps: the bar hot-rolled ribbed steel bar adopts a natural cooling mode to cool the surface temperature to be below 400 ℃.
4. The process method for improving the shearing elbow phenomenon of the hot-rolled ribbed steel bars of the bars according to claim 1, characterized by comprising the following steps: and shearing the unqualified part of the head of the bar hot-rolled ribbed steel bar at first during fixed-length shearing, and shearing the bar hot-rolled ribbed steel bar according to the fixed length to obtain a plurality of bar hot-rolled ribbed steel bar segments.
5. The process method for improving the shearing elbow phenomenon of the hot-rolled ribbed steel bars of the bars according to claim 1, characterized by comprising the following steps: the temperature of the shearing part of the bar hot-rolled ribbed steel bar is reduced to 100-200 ℃ by adopting a spraying mode.
6. The process method for improving the shearing elbow phenomenon of the hot-rolled ribbed steel bars of the bars, according to claim 5, is characterized in that: when spraying, spraying liquid with the water pressure of more than or equal to 0.4MPa and the temperature of less than or equal to 40 ℃ to the shearing part of the bar hot-rolled ribbed steel bar until the temperature of the shearing part of the bar hot-rolled ribbed steel bar is reduced to 100-200 ℃.
7. The process method for improving the shearing elbow phenomenon of the hot rolled ribbed steel bars of the bars according to any one of claims 1, 5 and 6, characterized by comprising the following steps: the temperature of the shearing part of the bar hot-rolled ribbed steel bar is reduced by 100-200 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110585440.8A CN113333484A (en) | 2021-05-27 | 2021-05-27 | Technological method for improving phenomenon of shearing bend of bar hot-rolled ribbed steel bar |
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| CN202110585440.8A CN113333484A (en) | 2021-05-27 | 2021-05-27 | Technological method for improving phenomenon of shearing bend of bar hot-rolled ribbed steel bar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115608795A (en) * | 2022-10-21 | 2023-01-17 | 武钢集团昆明钢铁股份有限公司 | A device and method for reducing shear bends of hot-rolled ribbed steel bars |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3940294A (en) * | 1973-10-17 | 1976-02-24 | British Steel Corporation | Cooling of hot rolled steel stock |
| JP2012024805A (en) * | 2010-07-23 | 2012-02-09 | Jfe Steel Corp | Method for manufacturing bar steel |
| CN204194426U (en) * | 2014-10-15 | 2015-03-11 | 新疆八一钢铁股份有限公司 | Anti-head bending device sheared by screw-thread steel |
| CN204353215U (en) * | 2014-12-21 | 2015-05-27 | 武钢集团昆明钢铁股份有限公司 | A kind of Bar Cooling Bed water mist cooling apparatus |
| CN110586667A (en) * | 2019-09-03 | 2019-12-20 | 石横特钢集团有限公司 | Forced cooling device for cooling bed and cooling bed adopting same |
| CN211249353U (en) * | 2019-12-13 | 2020-08-14 | 四川德胜集团钒钛有限公司 | Front spray cooling device of cold shearing machine |
| CN211538997U (en) * | 2019-12-27 | 2020-09-22 | 抚顺新钢铁有限责任公司 | Cooling device for hot-rolled threaded steel bar shearing area |
-
2021
- 2021-05-27 CN CN202110585440.8A patent/CN113333484A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3940294A (en) * | 1973-10-17 | 1976-02-24 | British Steel Corporation | Cooling of hot rolled steel stock |
| JP2012024805A (en) * | 2010-07-23 | 2012-02-09 | Jfe Steel Corp | Method for manufacturing bar steel |
| CN204194426U (en) * | 2014-10-15 | 2015-03-11 | 新疆八一钢铁股份有限公司 | Anti-head bending device sheared by screw-thread steel |
| CN204353215U (en) * | 2014-12-21 | 2015-05-27 | 武钢集团昆明钢铁股份有限公司 | A kind of Bar Cooling Bed water mist cooling apparatus |
| CN110586667A (en) * | 2019-09-03 | 2019-12-20 | 石横特钢集团有限公司 | Forced cooling device for cooling bed and cooling bed adopting same |
| CN211249353U (en) * | 2019-12-13 | 2020-08-14 | 四川德胜集团钒钛有限公司 | Front spray cooling device of cold shearing machine |
| CN211538997U (en) * | 2019-12-27 | 2020-09-22 | 抚顺新钢铁有限责任公司 | Cooling device for hot-rolled threaded steel bar shearing area |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115608795A (en) * | 2022-10-21 | 2023-01-17 | 武钢集团昆明钢铁股份有限公司 | A device and method for reducing shear bends of hot-rolled ribbed steel bars |
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Application publication date: 20210903 |