CN102672415A - Steel coil opening and leveling method for reducing warping of steel plate after cutting - Google Patents
Steel coil opening and leveling method for reducing warping of steel plate after cutting Download PDFInfo
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- CN102672415A CN102672415A CN2012101331267A CN201210133126A CN102672415A CN 102672415 A CN102672415 A CN 102672415A CN 2012101331267 A CN2012101331267 A CN 2012101331267A CN 201210133126 A CN201210133126 A CN 201210133126A CN 102672415 A CN102672415 A CN 102672415A
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Abstract
The invention discloses a steel coil opening and leveling method for reducing warping of a steel plate after cutting and belongs to the technical fields of metal plastic processing and molding. The opening and leveling method comprises opening the coil, longitudinally cutting edges, keeping smooth, straightening, transversely cutting and determining size, refinedly correcting, detecting, collecting and bundling finally. The steel coil opening and leveling method is characterized by adopting a two-roller or multi-roller leveling process, enabling residual stress of two surfaces of the steel plate to be unanimous in direction, and then straightening. The steel coil opening and leveling method can reduce deformation of an opening and leveling plate caused by residual stress release during processing, improves overall performance indexes and plate face stability of the opening and leveling plate, does not need any heat treatment and has the advantages of being capable of saving energy and reducing consumption, reducing treatment cost and shortening production cycles.
Description
Technical field
The invention belongs to the Metal Forming field shaping technique, be specifically related to a kind of coil of strip extraction of square root method that steel plate is cut the back warpage that reduces.
Background technology
For improving the production efficiency and being convenient to transportation, when dispatching from the factory, hot rolled strip is the cylindric rolling supply of material, then open flat processing, " opening plate " that the flat board that forms thus promptly is commonly called as before the use through machining.Manufacturing procedure by steel band to opening plate comprises: uncoiling-→ the rip cutting limit-→ aligning-→ the crosscut scale-→ collect, bundling.According to the GB GB/T 709-2006 definition of new revision, opening plate is called as shears steel plate (or continuous-milling steel plate), and corresponding therewith former flat board then is called as single rolled steel plate (singly offseting plate).
Although two types of steel plates can be accomplished indifference on material, comparing opening plate with former flat board still has following deficiency:
1, with regard to outer shape, the continuous-milling steel plate tolerance grade is higher, but width is narrower, gauge thickness is thin partially, and plate face unevenness will obviously be inferior to single rolled steel plate.
2, because tradition is opened flat processing carries out at the normal temperature state, process can't produce replys and crystallization again, and it is heavily stressed residual that plastic deformation and the work hardening that causes cause opening plate to exist, and surface quality and stability are relatively poor relatively.
3, opening plate internal stress distribution situation changes with the difference of working process parameter, still is difficult to accurately hold theoretically its regularity of distribution at present; The internal stress of uneven distribution causes sheet material different parts actual bearer capacity variance big (along laterally differing particularly evident), and is bigger to the use restriction of opening plate.
4, opening plate will slowly discharge internal residual stress after placing a period of time, and the different arcuation camber of degree can appear in the plate face; Meet processing such as bending, cutting or welding, opening plate more will discharge abundant residues stress fast, produce the distortion of proofreading and correct difficulty.This type of plate facial disfigurement can influence the use of sheet material.
5, in shipbuilding, dynamo-electric and pressure vessel manufacturing etc. sheet material is had the application of high surface quality and mechanical property coherence request, the application of opening plate is very limited.
As seen from the above analysis the residual stress of opening plate is big, causes plate face processing back because Stress Release causes its distortion, is the most fatal defect factors of opening plate quality.Patent CN1979161 discloses a kind of method of testing of hot continuous rolling high strength steel plate residual stress; This method is used resistance strain gauge the overstrain value of sample is measured; In conjunction with the value of COMPUTER CALCULATION sample residual stress, analyze whole sample residual stress distribution.The method of testing of the hot continuous rolling high strength steel plate residual stress that this invention provides is consistent, the result is accurate; Can intuitively measure hot continuous rolling high-intensity steel plate residual stress numerical value rapidly; The situation of change of complete quantitative response aligning process hot continuous rolling high-intensity steel plate residual stress distribution can be hot continuous rolling high-intensity steel plate straightening process theoretical foundation and technical support is provided.But this method only provides the detection method of steel plate residual-stress value, does not relate to and how to reduce the steel plate residual stress.Patent 200910083475 discloses a kind of deep processing treatment system for hot rolling strip steel, belongs to band steel deep process technology field, comprise one independently hot-strip open flat-bed machine group and a heat-treatment lines; Heat-treatment lines comprises a quenching heat treatment line and/or a normalizing heat-treatment lines; Hot-strip is opened flat-bed machine group and heat-treatment lines and is arranged in adjacent finished product strides, and hot-strip is opened opening plate that the flat-bed machine group produced and striden flat car or other means of transportation and be transported to that heat-treatment lines quenches or temper through crossing.Advantage is to have characteristics such as compound mode is simple, process route flexible, adaptation steel grade scope is wide; When satisfying domestic consumer's demand, but also production high-performance, high value-added product, to satisfy the specific demand of high-end user, panel products during part substitutes.But this method only is out the simple combination of flat production line and heat-treatment production line; Quench or temper not only invest big, processing cost is higher, the production cycle is long, oxidation has a strong impact on surface quality, and quenching or temper can cause steel plate and be out of shape once more.
Summary of the invention
To the existing deficiency of opening flat technology, the present invention provides a kind of coil of strip extraction of square root method that steel plate is cut the back warpage that reduces.
A kind of steel plate that reduces provided by the present invention is cut the concrete steps of the coil of strip extraction of square root method of back warpage and is: uncoiling, rip cutting limit, smooth, aligning, crosscut scale, smartly rectify, check, collect at last, bundling.Saidly smoothly be: use two rollers or multiple roll planisher that coil of strip is carried out the smooth processing of percentage elongation as 0.5-5%.
Opening plate mainly produces residual stress when uncoiling, and residual stress concentrates on the steel plate top layer basically, and the residual stress on two surfaces is in the opposite direction, and Stress Release forms stack moment after processing, has aggravated camber of sheet.In opening flat process, set up the smooth operation of steel strip surface; Can change the residual stress direction on two surfaces; Make their directions identical; Stress Release stress does not only produce stack moment after processing, and cancels out each other, and so significantly reduces opening plate and discharges the distortion that produces because of processing like residual stress in the processing such as bending, cutting or welding.
The present invention increases a smooth operation newly existing opening in the flat production line; Adopt two rollers or multiple roll planisher that opening plate is carried out smooth processing after the uncoiling; Smooth percentage elongation is at 0.5-5%; Smooth back gets into aligning, and the aligning under this state can change opening plate residual stress distribution and direction, thus but riser face quality stability and improve combination property.
The inventive method is through changing opening plate residual stress aspect and distribution; Reduce opening plate and discharge the deformation extent that produces like residual stress in the processing such as bending, cutting or welding because of processing; Improve opening plate integrated performance index and plate face quality stability; Simultaneously without any need for heat treatment step, energy-saving and cost-reducing, reduce processing cost, shorten the production cycle.
Cold working has generality, adaptability to method provided by the present invention to sheet material normal temperature, and is promptly very suitable to a series of sheet material deep processings that comprise cold-rolled forming section production.
The specific embodiment
Embodiment 1: open at the conventional steel band of certain factory and install a cover two-high dressing mill on the horizontal line additional.
Opening flat steel band is 6 * 1800, rolls up heavyly 20 tons, and steel grade is Q235B, and opening plate is of a size of 6 * 1800 * 120000.
At first adopt common process to carry out uncoiling and cut edge, launch the two-high dressing mill before the aligning afterwards, to steel plate carry out percentage elongation be 1% smooth, align afterwards, crosscut, smart rectifying collected after the check, packed.
To shearing processing, specifically be longitudinally to cut 200mm respectively, detect the warpage degree of steel plate head with sawing method at the steel plate of opening after putting down with the opening plate of the inventive method and produced in conventional processes.Assay is as shown in table 1.Decline to a great extent from the visible warpage degree of the opening plate head of the inventive method production that adopts of table 1.
The warpage degree test comparison of the opening plate head of table 1 the inventive method and produced in conventional processes
| Limit portion (Mpa) | Center (Mpa) | |
| The warpage degree of traditional handicraft | 10 | 6 |
| The warpage degree of new technology | 3 | 2 |
Embodiment 2: open at the conventional steel band of certain factory and install a cover four roller planishers on the horizontal line additional.
Opening flat steel band is 10 * 1800, rolls up heavyly 22 tons, and steel grade is Q345B, and opening plate is of a size of 10 * 1800 * 120000.
At first adopt common process to carry out uncoiling and cut edge, launch the two-high dressing mill before the aligning afterwards, to steel plate carry out percentage elongation be 1.5% smooth, align afterwards, crosscut, smart rectifying collected after the check, packed.
To shearing processing, specifically be longitudinally to cut 200mm respectively, detect the warpage degree of steel plate head with sawing method at the steel plate of opening after putting down with the opening plate of the inventive method and produced in conventional processes.Assay is as shown in table 2.Decline to a great extent from the visible warpage degree of the opening plate head of the inventive method production that adopts of table 2.
| ? | Limit portion (Mpa) | Center (Mpa) |
| The warpage degree of traditional handicraft (mm) | 8 | 5 |
| The warpage degree of new technology (mm) | 2.5 | 2 |
Embodiment 3:
Open at the conventional steel band of certain factory and to install a cover four roller planishers on the horizontal line additional.
Opening flat steel band is 16 * 2000, rolls up heavyly 30 tons, and steel grade is Q235B, and opening plate is of a size of 16 * 2000 * 120000.
At first adopt common process to carry out uncoiling and cut edge, launch the two-high dressing mill before the aligning afterwards, to steel plate carry out percentage elongation be 3% smooth, align afterwards, crosscut, smart rectifying collected after the check, packed.
To shearing processing, specifically be longitudinally to cut 200mm respectively, detect the warpage degree of steel plate head with sawing method at the steel plate of opening after putting down with the opening plate of the inventive method and produced in conventional processes.Assay is as shown in table 3.Decline to a great extent from the visible warpage degree of the opening plate head of the inventive method production that adopts of table 3.
The warpage degree test comparison of the opening plate head of table 3 the inventive method and produced in conventional processes
| Limit portion (Mpa) | Center (Mpa) | |
| The warpage degree of traditional handicraft (mm) | 6 | 5 |
| The warpage degree of new technology (mm) | 1.5 | 1.5 |
Claims (2)
1. one kind is reduced the coil of strip extraction of square root method that steel plate is cut the back warpage, it is characterized in that said coil of strip extraction of square root method concrete steps are: uncoiling, rip cutting limit, smooth, aligning, crosscut scale, smartly rectify, check, collect at last, bundling.
2. a kind of coil of strip extraction of square root method that steel plate is cut the back warpage that reduces according to claim 1 is characterized in that saidly smoothly being: use two rollers or multiple roll planisher that coil of strip is carried out the smooth processing of percentage elongation as 0.5-5%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101331267A CN102672415A (en) | 2012-05-03 | 2012-05-03 | Steel coil opening and leveling method for reducing warping of steel plate after cutting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101331267A CN102672415A (en) | 2012-05-03 | 2012-05-03 | Steel coil opening and leveling method for reducing warping of steel plate after cutting |
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| CN102672415A true CN102672415A (en) | 2012-09-19 |
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| CN2012101331267A Pending CN102672415A (en) | 2012-05-03 | 2012-05-03 | Steel coil opening and leveling method for reducing warping of steel plate after cutting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103495850A (en) * | 2013-07-24 | 2014-01-08 | 李庆中 | Low residual stress steel belt decoiling technology |
| CN111975289A (en) * | 2020-07-16 | 2020-11-24 | 烟台宝井钢材加工有限公司 | Method for using non-precision-cut edge of ultra-long weld joint as welding edge |
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| CN101486051A (en) * | 2009-02-24 | 2009-07-22 | 武钢集团昆明钢铁股份有限公司 | Method for leveling titanium board coil |
| CN101670372A (en) * | 2009-09-25 | 2010-03-17 | 首钢总公司 | Method for eliminating defect of strip shape of hot-rolled high-strength steel |
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| JPH0976002A (en) * | 1995-09-12 | 1997-03-25 | Hitachi Metals Ltd | Method for rolling wire rod |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103495850A (en) * | 2013-07-24 | 2014-01-08 | 李庆中 | Low residual stress steel belt decoiling technology |
| CN111975289A (en) * | 2020-07-16 | 2020-11-24 | 烟台宝井钢材加工有限公司 | Method for using non-precision-cut edge of ultra-long weld joint as welding edge |
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Application publication date: 20120919 |