CN112872106B - Method for straightening low-carbon steel by using withdrawal and straightening machine - Google Patents
Method for straightening low-carbon steel by using withdrawal and straightening machine Download PDFInfo
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- CN112872106B CN112872106B CN202110041776.8A CN202110041776A CN112872106B CN 112872106 B CN112872106 B CN 112872106B CN 202110041776 A CN202110041776 A CN 202110041776A CN 112872106 B CN112872106 B CN 112872106B
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- tension leveler
- welding seam
- tension
- straightening
- steel
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 14
- 238000003466 welding Methods 0.000 claims abstract description 54
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 38
- 239000010959 steel Substances 0.000 claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 8
- 230000009467 reduction Effects 0.000 claims abstract description 4
- 230000009471 action Effects 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000005554 pickling Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Straightening Metal Sheet-Like Bodies (AREA)
Abstract
The invention discloses a method for straightening low-carbon steel by a tension leveler, which comprises the following steps: when the welding seam reaches the front of the tension leveler, the whole speed of the production line is not reduced, and the original speed is maintained unchanged; when the welding seam reaches the front of the tension leveler, setting the roll gap of each tension leveler roll according to the small meshing degree or the small rolling reduction of the front steel and the rear steel in the process of passing the welding seam of the tension leveler; when the welding seam reaches the front of the tension leveler, in the process of passing the welding seam of the tension leveler, the set value of the elongation percentage of the tension leveler adopts the parameter with small set values of two steels before and after the welding seam; when the welding seam reaches the front of the tension leveler, the tension roller is closed before and after the tension leveler passes the welding seam. The invention aims to solve the problem that the production line cannot stably and smoothly run due to the accident that the welding seam breaks under the stretching and straightening action of a stretching and straightening machine when the welding seam passes through the stretching and straightening machine, and simultaneously ensures the production efficiency.
Description
Technical Field
The invention relates to a method for straightening low-carbon steel by a tension leveler.
Background
The acid rolling production line is a production line for changing hot rolling raw materials into cold rolled steel coils through transportation, uncoiling, head and tail straightening, welding, withdrawal straightening, acid washing, trimming, rolling and coiling. The main process flow is that the hot rolled coil is transported from a raw material storage span to a cold rolled span walking beam. The walking beam is provided with a steel coil outer diameter measuring device, a steel coil width detecting device and a steel coil weighing station, and after the steel coil outer diameter data is recorded, the hot rolled coils are automatically positioned to the corresponding mandrel heights of the uncoiler by the coiling trolley. A centering device is also arranged for correcting the deviation of the position of the coil. The centered steel coil is transported to the carrier roller of the uncoiler, and the steel coil strapping tape is manually removed on the carrier roller of the uncoiler. After the strapping is dismantled, the rotating idler rotates the steel belt head, and the steel belt head is fed into the uncoiler. The feeding action is realized by a carrier roller. By rotating the unwinder in the opposite direction, the web head is bent upwards. The pre-bending of the head of the strap can simplify the threading process through the straight-head machine. After the steel coil is pre-bent, the walking beam conveyor conveys the steel coil to the uncoiler for uncoiling. The coiled steel coil after uncoiling is subjected to straightening of the head and the tail of the steel belt by a straight head machine, welding by a welding machine, withdrawal and straightening of the steel belt by a withdrawal and straightening machine, pickling by a pickling tank, rinsing by a rinsing tank, drying by a dryer, trimming and shearing, rolling by a rolling mill and coiling by a coiling machine to obtain a qualified cold rolled coil.
In order to ensure continuous and stable operation of a unit and ensure good pickling effect, a withdrawal and straightening machine is generally arranged at the inlet of an acid tank, and the withdrawal and straightening machine mainly plays roles of descaling and withdrawal and straightening. The scale breaking mainly means that iron scales are broken, compact iron oxide skins generally exist on the surface of the steel belt, the compact iron scales restrict the pickling effect, and the compact iron scales can be broken through reciprocating bending, so that the pickling effect is improved; the tension leveler mainly aims to obtain a good plate shape, eliminate the problems of plate surface wave edges, wave shapes, buckling and the like, greatly improve the flatness of a steel plate, and improve the anisotropy of materials, so that the thickness of the plate is uniform. The stretching and straightening machine mainly realizes the functions of scale breaking and stretching and straightening through a certain elongation percentage, and the elongation percentage of the stretching and straightening machine is 3% at most under the general condition. The bending device is generally arranged in the tension leveler, and mainly aims to straighten the strip steel by using the tension roller alone, so that the tension generated by the tension roller exceeds the yield strength of the strip steel, a large amount of energy is consumed, the requirement on the transmission device is high, and the equipment wear and failure rate are high. The bending function is to bend the strip steel on the roller, thereby greatly promoting the straightening effect. The stretching and straightening machine stretches and straightens the welding seam in the process of straightening the steel belt, and the strength and toughness of the welding seam are higher than those of the base metal under normal conditions, so that the welding seam is not influenced in the stretching and straightening process. Otherwise, once the strength and toughness of the welding seam can not meet the requirement of tension leveler, the welding seam can be disconnected at the tension leveler, so that accidents occur, and abnormal shutdown of the production line is caused.
The main steel grade of cold rolling production is low carbon steel, and the low carbon steel has low carbon content and low manganese and silicon content, so that a severe hardening structure or a quenching structure is not generated due to welding under normal conditions. The welded joint of the low-carbon steel has good plasticity and impact toughness, and the welding process generally does not need preheating, interlayer temperature control and post heat control, and the structure is not improved by adopting heat treatment after welding, so that the whole welding process does not need special technological measures, and the welding performance is excellent. In a few cases, however, difficulties arise in welding: 1. the nitrogen content in smelting steel is high, the impurity content is high, so that the cold brittleness is high, the ageing sensitivity is increased, the quality of a welded joint is reduced, and the weldability is poor. 2. The boiling steel is incomplete in deoxidization, high in oxygen content, uneven in impurity distribution such as P, and high in aging sensitivity and cold brittleness sensitivity, and the hot cracking tendency is increased, wherein the content of local areas exceeds the standard. 3. The welding process selection of the production line is unreasonable, so that the quality of the welding line can not meet the requirements. Therefore, the withdrawal and straightening machine needs to be properly adjusted at the welding seam position so as to ensure the stable and smooth operation of the production line.
Disclosure of Invention
The invention aims to provide a method for straightening low-carbon steel by a tension leveler, which solves the problem that a production line cannot stably and smoothly run due to the accident of strip breakage of a welding seam under the action of stretching and straightening of the tension leveler when the welding seam passes through the tension leveler, and simultaneously ensures the production efficiency.
In order to solve the technical problems, the invention adopts the following technical scheme:
A method for straightening low carbon steel by a withdrawal and straightening machine, comprising:
When the welding seam reaches the front of the tension leveler, the whole speed of the production line is not reduced, and the original speed is maintained unchanged;
when the welding seam reaches the front of the tension leveler, setting the roll gap of each tension leveler roll according to the small meshing degree or the small rolling reduction of the front steel and the rear steel in the process of passing the welding seam of the tension leveler;
when the welding seam reaches the front of the tension leveler, in the process of passing the welding seam of the tension leveler, the set value of the elongation percentage of the tension leveler adopts the parameter with small set values of two steels before and after the welding seam;
When the welding seam reaches the front of the tension leveler, the tension roller is closed before and after the tension leveler passes the welding seam.
Further, when the weld passes through the tension leveler, the compression rollers of the front tension roller and the rear tension roller of the tension leveler are all opened.
Compared with the prior art, the invention has the beneficial technical effects that:
in the process of straightening low-carbon steel by the tension leveler, a strategy of not slowing down and not opening a roll gap is adopted, but the setting of smaller elongation and meshing degree is selected in the selection of elongation and roll gap values, so that the production efficiency is improved, the productivity is increased, and meanwhile, the stable operation of a production line is effectively ensured.
Drawings
The invention is further described with reference to the following description of the drawings.
Fig. 1 is a diagram showing the arrangement of a tension leveler and front and rear tension rollers.
FIG. 2 is a roller system diagram of a withdrawal and straightening machine;
Reference numerals illustrate: 1. a correction roller; 2. a steering roller; 3. a tension roller in front of the tension leveler; 4. a tension leveler roller system; 5. a tension roller behind the tension leveler; 6. a pickling tank; 7. a roller box; 8. bending roller of withdrawal and straightening machine.
Detailed Description
A method for straightening low-carbon steel by a tension leveler mainly aims at avoiding the occurrence of the accident of strip breakage of a welding seam under the action of stretching and straightening of the tension leveler when the welding seam passes through the tension leveler. The configuration diagram of the tension leveler and the front and rear tension rollers is shown in fig. 1. The specific technical scheme is as follows:
A method for straightening low carbon steel by a withdrawal and straightening machine, comprising:
When the welding seam reaches the front of the tension leveler, the whole speed of the production line is not reduced, and the original speed is maintained unchanged.
When the welding seam reaches the front of the tension leveler, the roll gaps of the tension leveler rolls reach the set roll gaps according to the small meshing degree (or rolling reduction) value (the two steel belts before and after the welding seam are different in meshing degree set values due to different factors such as steel types, widths, thicknesses and the like), the larger the meshing degree is, the larger the deformation of the steel belts is, and the smaller the meshing degree is, the smaller the deformation of the steel belts is. The roller system diagram of the tension leveler is shown in fig. 2;
When the welding line reaches the front of the tension leveler, the elongation of the tension leveler reaches the set elongation according to the small elongation value (the two steel belts before and after the welding line have different elongation set values due to factors such as steel types, widths, thicknesses and the like, the larger the elongation is, the larger the deformation of the steel belts is, and the smaller the elongation is, the smaller the deformation of the steel belts is);
When the welding seam reaches the front of the tension leveler, the compression rollers of the front tension roller and the rear tension roller of the tension leveler are all pressed down; when the welding seam passes through the tension leveler, the compression rollers of the front tension roller and the rear tension roller of the tension leveler are all opened, and the steel belt can be pressed in time when a belt breakage accident occurs, so that accident loss is reduced.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (2)
1. A method for straightening low carbon steel by a tension leveler, comprising:
When the welding seam reaches the front of the tension leveler, the whole speed of the production line is not reduced, and the original speed is maintained unchanged;
when the welding seam reaches the front of the tension leveler, setting the roll gap of each tension leveler roll according to the small meshing degree or the small rolling reduction of the front steel and the rear steel in the process of passing the welding seam of the tension leveler;
when the welding seam reaches the front of the tension leveler, in the process of passing the welding seam of the tension leveler, the set value of the elongation percentage of the tension leveler adopts the parameter with small set values of two steels before and after the welding seam;
When the welding seam reaches the front of the tension leveler, the tension roller is closed before and after the tension leveler passes the welding seam.
2. The method for straightening low-carbon steel by a tension leveler according to claim 1, wherein the press rolls of the tension rolls before and after the tension leveler are all opened when the weld passes through the tension leveler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110041776.8A CN112872106B (en) | 2021-01-13 | 2021-01-13 | Method for straightening low-carbon steel by using withdrawal and straightening machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110041776.8A CN112872106B (en) | 2021-01-13 | 2021-01-13 | Method for straightening low-carbon steel by using withdrawal and straightening machine |
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| Publication Number | Publication Date |
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| CN112872106A CN112872106A (en) | 2021-06-01 |
| CN112872106B true CN112872106B (en) | 2024-06-11 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203955774U (en) * | 2014-05-19 | 2014-11-26 | 北京佰能电气技术有限公司 | A kind of withdrawal straightening machine control device and system |
| DE102015219877A1 (en) * | 2014-10-20 | 2016-04-21 | Berndorf Band Gmbh | Method and device for straightening a metal strip |
| CN106424170A (en) * | 2016-09-28 | 2017-02-22 | 邯钢集团邯宝钢铁有限公司 | Pickling line tandem cold mill withdrawal and straightening machine control method |
| CN110586691A (en) * | 2019-09-09 | 2019-12-20 | 新余钢铁股份有限公司 | Control method for passing welding line of silicon steel strip through withdrawal and straightening machine |
| CN111185482A (en) * | 2020-01-15 | 2020-05-22 | 北京科技大学 | Stretch bending straightening mechanical system with over-weld self-adaptive function |
-
2021
- 2021-01-13 CN CN202110041776.8A patent/CN112872106B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203955774U (en) * | 2014-05-19 | 2014-11-26 | 北京佰能电气技术有限公司 | A kind of withdrawal straightening machine control device and system |
| DE102015219877A1 (en) * | 2014-10-20 | 2016-04-21 | Berndorf Band Gmbh | Method and device for straightening a metal strip |
| CN106424170A (en) * | 2016-09-28 | 2017-02-22 | 邯钢集团邯宝钢铁有限公司 | Pickling line tandem cold mill withdrawal and straightening machine control method |
| CN110586691A (en) * | 2019-09-09 | 2019-12-20 | 新余钢铁股份有限公司 | Control method for passing welding line of silicon steel strip through withdrawal and straightening machine |
| CN111185482A (en) * | 2020-01-15 | 2020-05-22 | 北京科技大学 | Stretch bending straightening mechanical system with over-weld self-adaptive function |
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| Publication number | Publication date |
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| CN112872106A (en) | 2021-06-01 |
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