CN115488147A - Multi-pass low-temperature rolling method for high-ductility cold-rolled ribbed steel bar - Google Patents
Multi-pass low-temperature rolling method for high-ductility cold-rolled ribbed steel bar Download PDFInfo
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- CN115488147A CN115488147A CN202211123553.7A CN202211123553A CN115488147A CN 115488147 A CN115488147 A CN 115488147A CN 202211123553 A CN202211123553 A CN 202211123553A CN 115488147 A CN115488147 A CN 115488147A
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- steel bar
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 69
- 239000010959 steel Substances 0.000 title claims abstract description 69
- 238000005096 rolling process Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 28
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000005496 tempering Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims 3
- 238000009413 insulation Methods 0.000 claims 1
- 239000010953 base metal Substances 0.000 description 6
- 230000003014 reinforcing effect Effects 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Classifications
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a multi-pass low-temperature rolling method of a high-ductility cold-rolled ribbed steel bar, which relates to the technical field of processing of the cold-rolled ribbed steel bar. The rolling method reduces the processing cost of the ribbed steel bar, has good performance, and is energy-saving and environment-friendly.
Description
Technical Field
The invention belongs to the technical field of processing of cold-rolled ribbed steel bars, and particularly relates to a multi-pass low-temperature rolling method of high-ductility cold-rolled ribbed steel bars.
Background
The high-ductility cold-rolled ribbed steel bar is a cold-rolled ribbed steel bar with higher elongation. However, most of the existing manufacturers produce the high-ductility cold-rolled ribbed steel bar by a complex process, complex operation and long production period, the produced cold-rolled ribbed steel bar has a thick and uneven metallographic structure, and the metallographic structure contains martensite, austenite, ferrite and pearlite, so that the elongation of the steel bar is still low, and the performance of the processed steel bar sometimes cannot meet the engineering requirements.
Disclosure of Invention
The invention aims to provide a multi-pass low-temperature rolling method of a high-ductility cold-rolled ribbed steel bar, which is characterized in that after a common carbon steel wire rod is processed, the internal structure and the grain size of the steel bar are changed, so that the strength and the elongation of the steel bar are effectively improved.
In order to solve the technical problem, the technical scheme adopted by the invention is a multi-pass low-temperature rolling method of a high-ductility cold-rolled ribbed steel bar, which comprises the following steps:
the method comprises the following steps: the left pay-off rack and the right pay-off rack are utilized to pay off the hot-rolled wire rod reinforcing steel bars in an auxiliary mode, so that the safety production is guaranteed, and the production efficiency is improved.
Step two: straightening the hot-rolled wire rod reinforcing steel bar in the step one by using a dephosphorization machine, and enabling the surface oxide skin to fall off.
Step three: and (4) rolling and reducing the hot rolled wire rod straightened in the step two by using a multi-pass reducing mill, and rolling the hot rolled base metal with the diameter of 8mm into an elliptical strip size with the height of 4.2mm and the width of 10.2 mm.
Step four: and tempering the elliptical strip-shaped steel bars in the third step by using an intermediate frequency heating furnace, wherein the tempering temperature is 530-570 ℃.
Step five: and (4) continuously reducing the heated elliptical reinforcing steel bars in the fourth step by using a forming rolling mill, and scoring while reducing the diameter to roll the elliptical reinforcing steel bars into cold-rolled ribbed reinforcing steel bars meeting set requirements.
Step six: and D, shearing the cold-rolled ribbed steel bars which do not meet the set temperature requirement in the fifth step by using a flying shear, stopping the flying shear when the tapping temperature reaches the set value, and enabling the steel bars to enter the next step.
Step seven: and (4) feeding the cold-rolled ribbed steel bars which have been subjected to the specific tempering temperature in the sixth step into a wire laying head by utilizing a pinch roll.
Step eight: and (4) discharging the cold-rolled ribbed steel bars sent in the step seven by using a wire-feeding machine, forming a coiled screw on an air-cooled roller way, and conveying the coiled screw to a coil collecting cylinder.
Step nine: and (4) conveying the coiled steel bars in the centralized winding drum in the step eight out for bundling, weighing, inspecting and warehousing by using a centralized winding machine.
Preferably, two pay off stands are vertically placed, and during feeding, the vertically placed pay off stands are turned to the horizontal through a turning device, and the pay off stands are turned to the vertical through the turning device after the feeding is finished.
Preferably, the reducing mill consists of three rolling mills, and materials are sequentially rolled into oval, round and oval rolled pieces.
The intermediate frequency heating furnace is composed of three heating furnaces with the power of 7000kW, and when the rolled piece is tempered, the tempering temperature is 530-570 ℃, and the tempering temperatures of different specifications are different.
The reducing rolling mill and the forming rolling mill are alternately arranged at an angle of 45 degrees, a loop device is arranged between the rolling mills, and the fluctuation of the loop is controlled by an electric control device, so that the non-tension or micro-tension rolling of the production line is realized.
The motor used by the flying shear is an alternating current motor, and a scrap steel groove is arranged below the flying shear, so that unqualified steel bars can be collected conveniently.
The air cooling roller way is provided with the heat preservation cover, so that the controlled cooling of the rolled steel bar can be realized, and the stable performance of the steel bar is ensured.
Compared with the prior art, the invention has the beneficial effects that:
the common carbon steel wire rod is subjected to paying off, descaling, two-time diameter reduction, heat treatment, forming, spinning, cooling and coil collection to change the internal structure and the grain size of the steel bar, so that the strength and the elongation of the steel bar are improved;
in the process of re-rolling and reducing, the steel bar is changed into an oval flat steel bar inclined at 45 degrees from a hot-rolled round base metal, the method increases the deformation rate, the internal and external deformation of the material is more uniform, the work hardening phenomenon is more obvious, and a cold-rolled steel bar with higher strength can be obtained;
in addition, after the flat reinforcing steel bar obtained after reducing is sent into the intermediate frequency heating furnace, the temperature of the reinforcing steel bar is favorably improved, the internal temperature of the reinforcing steel bar can quickly reach the specified temperature, and the internal and external heating of the reinforcing steel bar is more uniform; the method has the advantages that the diameter reduction and rib pressing are rapidly carried out after the steel bar is tempered, so that the rolling load of a forming rolling mill can be reduced, the temperature of the steel bar is increased during rolling, the temperature which is decreased after the steel bar is discharged from a furnace is complemented, the tempering time is prolonged, the elongation is improved, the cost is reduced, and the method is energy-saving and environment-friendly.
Drawings
FIG. 1 is a flow chart of the production process of the present invention;
FIG. 2 is a flow chart of the production apparatus of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1:
(1) When high-ductility cold-rolled ribbed steel bars are processed, the head and the tail of steel coils on two pay-off frames are welded by a butt welder, continuous pay-off is guaranteed, and production efficiency is improved.
(2) And straightening and dephosphorizing the hot-rolled base metal by using a dephosphorizing machine to remove iron scales on the surface of the steel bar. A collecting pipeline is arranged below the phosphorus removing machine, so that the fallen iron oxide scales are collected and sold, and the production cost is saved.
(3) After the dephosphorization is straightened by the dephosphorization machine, the hot-rolled steel bar base metal with the diameter of 8mm is reduced by the rolling of the first reducing mill to obtain an oval bar with the height of 5.2mm and the width of 10.2mm, the base metal is reduced by the rolling of the second reducing mill to obtain an approximately square bar with the height of 8.6mm and the width of 5.8mm, and finally the base metal is reduced by the rolling of the third reducing mill to generate an oval bar with the height of 4.2mm and the width of 10.2mm, so that the deformation of the steel bar is increased as much as possible, meanwhile, the deformation in the steel bar is more uniform, and the strength of the high-ductility cold-rolled steel bar is improved.
(4) And (3) carrying out low-temperature tempering heat treatment on the bar-shaped steel bar subjected to 3-pass rolling and reducing by using an intermediate frequency heating furnace, wherein the tempering temperature is 530 ℃, so that the strength of the cold-rolled ribbed steel bar is reduced, and the elongation is increased. Because the bar reinforcing bar be oval-shaped, and with 45 horizontal contained angle slant entering into the heating furnace make the rate of heating of reinforcing bar fast, the inside and outside heating of reinforcing bar is also more even, is favorable to improving production speed, improves production efficiency.
(5) And (3) performing forming rolling on the bar-shaped steel bar subjected to low-temperature tempering by using a forming rolling mill, and performing rib pressing while reducing the diameter of the steel bar so as to obtain the product size meeting the national standard. Because the bar-shaped reinforcing steel bar still has higher temperature, the rolling load of a rolling mill is greatly reduced, and the strength and the elongation rate of the high-ductility cold-rolled ribbed reinforcing steel bar are improved.
(6) And measuring the temperature of the cold-rolled ribbed steel bar after forming and rolling by using a temperature measuring instrument, and cutting off the cold-rolled ribbed steel bar which does not meet the set temperature requirement by using a flying shear until the temperature of the cold-rolled ribbed steel bar after forming is qualified.
(7) The pinch roll is used for feeding rolled steel bars into a wire-feeding machine for wire feeding, and because the flying shear cuts off cold steel with insufficient tempering temperature at the head, the steel bars conveyed by the pinch roll have high temperature and low strength, thereby greatly reducing the phenomena of wire clamping and wire breaking of the wire-feeding machine. The steel bar is discharged by the wire-feeding machine and then falls into the air-cooled roller way to form a spiral shell. The reinforcing steel bars forming the spiral coils are conveyed forwards to a coil collecting machine set while being cooled on an air cooling roller way, and are packed, weighed and inspected through a PF (power factor) conveying line after coil collecting and separating by the coil collecting machine, and finally are unloaded and stored in a warehouse through an uncoiling machine.
Three loop devices are arranged in the whole production line and are respectively positioned among all rolling mills, and non-tension or micro-tension rolling on the whole production line can be realized by changing the storage amount of the loops, namely, the rolled pieces between the racks have no steel drawing relation in the rolling process. Tension generated between the racks is prevented from causing the section of the rolled piece to be drawn and contracted, and the precision of the size of the rolled piece is prevented from being influenced; meanwhile, the steel piling accident between the machine frames caused by steel piling can be prevented.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (7)
1. A method for multi-pass low temperature rolling of high ductility cold rolled ribbed steel bar, said method comprising the following equipment: butt welding machine, pay-off rack, dephosphorization machine, rolling mill, loop, intermediate frequency heating furnace, thermoscope, flying shear, steel rolling machine, pinch roll, laying head, air-cooled roller way, coil collecting station, PF line, baling press, weighing machine and coil unloading station.
The method comprises the following steps:
the method comprises the following steps: and carrying out auxiliary paying-off on the hot-rolled wire rod reinforcing steel bars through two pay-off frames, and welding the tail part of the steel coil on one pay-off frame and the head part of the steel coil on the other pay-off frame together by using a butt welding machine.
Step two: and (4) introducing the hot-rolled wire rod reinforcing steel bar in the step one into a dephosphorization machine for straightening, so that the oxide skin on the surface of the reinforcing steel bar falls off.
Step three: and (4) feeding the hot rolled wire rod straightened in the step two into three reducing mills for rolling and reducing.
Step four: and (4) sending the elliptic strip-shaped reinforcing steel bars in the third step into an intermediate frequency heating furnace for tempering treatment.
Step five: and C, feeding the oval steel bars heated in the fourth step into a forming rolling mill for continuous reducing, and scoring while reducing to roll the oval steel bars into cold-rolled ribbed steel bars meeting set requirements.
Step six: and D, sending the cold-rolled ribbed steel bars which do not meet the set temperature requirement in the step five into a flying shear to be sheared, stopping the flying shear when the tapping temperature reaches a set value, and enabling the steel bars to enter the next step.
Step seven: and sending the cold-rolled ribbed steel bars subjected to the specific tempering temperature in the sixth step into a wire laying head through a pinch roll for laying wires.
Step eight: and C, placing the cold-rolled ribbed steel bars discharged in the step seven on an air-cooling roller way for air cooling.
Step nine: and (5) conveying the steel bars subjected to air cooling in the step eight into a collecting drum for collecting and coiling, and finally bundling, weighing, inspecting and warehousing.
2. The method of claim 1, wherein the method comprises the following steps: during feeding, the pay-off stand which is vertically placed is turned to be horizontal through the turning device, and the pay-off stand is turned to be vertical through the turning device after the feeding is finished.
3. The method of claim 1, wherein the method comprises the following steps: the three reducing mills are respectively a first reducing mill, a second reducing mill and a third reducing mill, and the three reducing mills sequentially roll the supplied materials into oval, round and oval rolled pieces.
4. The method of claim 1, wherein the method comprises the following steps: the intermediate frequency heating furnace is composed of three heating furnaces with the power of 7000kW, and when the rolled piece is tempered, the tempering temperature is 530-570 ℃, and the tempering temperatures of different specifications are different.
5. A method for multi-pass low-temperature rolling of high-ductility cold-rolled ribbed steel bars according to claims 1 and 3, characterized in that: the rolling mills are alternately arranged at an angle of 45 degrees, a loop device is arranged between the rolling mills, and the fluctuation of the loop is controlled by an electric control device, so that the non-tension or micro-tension rolling of the production line is realized.
6. The method of claim 1, wherein the method comprises the following steps: the motor used by the flying shear is an alternating current motor, and a scrap steel groove is arranged below the flying shear, so that unqualified steel bars can be collected conveniently.
7. The method of claim 1, wherein the method comprises the following steps: and a heat insulation cover is arranged on the air cooling roller way.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211123553.7A CN115488147A (en) | 2022-09-15 | 2022-09-15 | Multi-pass low-temperature rolling method for high-ductility cold-rolled ribbed steel bar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211123553.7A CN115488147A (en) | 2022-09-15 | 2022-09-15 | Multi-pass low-temperature rolling method for high-ductility cold-rolled ribbed steel bar |
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| CN115488147A true CN115488147A (en) | 2022-12-20 |
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| CN202211123553.7A Pending CN115488147A (en) | 2022-09-15 | 2022-09-15 | Multi-pass low-temperature rolling method for high-ductility cold-rolled ribbed steel bar |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4134178A1 (en) * | 1991-10-16 | 1993-04-22 | Juergen Dr Ing Pietsch | Hollow ribbed reinforcement bar prodn. - by flattening starter tube and ribbing outer surface by rolling with profiled rolls |
| CN101185938A (en) * | 2006-11-09 | 2008-05-28 | 钢铁研究总院 | Method for producing steel bar with rib |
| CN105436233A (en) * | 2015-12-16 | 2016-03-30 | 重庆麦拓科技有限公司 | Processing technology of cold-rolled steel bar |
| CN106269853A (en) * | 2016-08-16 | 2017-01-04 | 重庆市晟庄建材有限责任公司 | A kind of high ductility cold-rolled ribbed bars processing method |
| CN109877154A (en) * | 2019-03-13 | 2019-06-14 | 河南省鼎鼎实业有限公司 | A kind of production system and production method of high ductility Ribbed Bar |
| 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 |
| CN112090957A (en) * | 2020-09-03 | 2020-12-18 | 马鞍山延隆新材料科技有限公司 | Preparation method of high-ductility cold-rolled ribbed steel bar |
| CN112239830A (en) * | 2020-08-31 | 2021-01-19 | 盐城市联鑫钢铁有限公司 | Low-cost high-ductility disc strip for CRB600H and rolling process thereof |
-
2022
- 2022-09-15 CN CN202211123553.7A patent/CN115488147A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4134178A1 (en) * | 1991-10-16 | 1993-04-22 | Juergen Dr Ing Pietsch | Hollow ribbed reinforcement bar prodn. - by flattening starter tube and ribbing outer surface by rolling with profiled rolls |
| CN101185938A (en) * | 2006-11-09 | 2008-05-28 | 钢铁研究总院 | Method for producing steel bar with rib |
| CN105436233A (en) * | 2015-12-16 | 2016-03-30 | 重庆麦拓科技有限公司 | Processing technology of cold-rolled steel bar |
| CN106269853A (en) * | 2016-08-16 | 2017-01-04 | 重庆市晟庄建材有限责任公司 | A kind of high ductility cold-rolled ribbed bars processing method |
| CN109877154A (en) * | 2019-03-13 | 2019-06-14 | 河南省鼎鼎实业有限公司 | A kind of production system and production method of high ductility Ribbed Bar |
| 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 |
| CN112239830A (en) * | 2020-08-31 | 2021-01-19 | 盐城市联鑫钢铁有限公司 | Low-cost high-ductility disc strip for CRB600H and rolling process thereof |
| CN112090957A (en) * | 2020-09-03 | 2020-12-18 | 马鞍山延隆新材料科技有限公司 | Preparation method of high-ductility cold-rolled ribbed steel bar |
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Application publication date: 20221220 |
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