CN112831648A - Method for eliminating single-side wave defect of oriented silicon steel - Google Patents
Method for eliminating single-side wave defect of oriented silicon steel Download PDFInfo
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- CN112831648A CN112831648A CN202110006701.6A CN202110006701A CN112831648A CN 112831648 A CN112831648 A CN 112831648A CN 202110006701 A CN202110006701 A CN 202110006701A CN 112831648 A CN112831648 A CN 112831648A
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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
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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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
- C21D6/00—Heat treatment of ferrous alloys
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- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
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Abstract
The invention discloses a method for eliminating the single-side wave defect of oriented silicon steel, which comprises the following steps: 1) manufacturing a special cover plate; the special cover plate comprises an annular plate, and a plurality of shearing positions are arranged on the outer edge of the annular plate; 2) hoisting the oriented silicon steel coil to be charged to a high-temperature annealing furnace platform; 3) paving the special cover plate on the outer ring of the upper end surface of the oriented silicon steel coil; 4) bending each cut part on the special cover plate downwards to hook the outer edge of the oriented silicon steel coil; 5) buckling an inner cover, and performing sand sealing on the bottom edge of the inner cover; 6) and feeding the steel coil into a furnace to finish the high-temperature annealing process. The invention can effectively protect the edge of the steel coil and prevent the upper end surface of the steel coil from flanging; the method can also discharge the moisture in the steel coil, and avoid the oxidation of the surface of the steel strip.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for eliminating the single-side wave defect of oriented silicon steel in the high-temperature annealing process of the oriented silicon steel.
Background
Oriented silicon steel is also called cold-rolled transformer steel, is an important ferrosilicon alloy applied to manufacturing transformer iron cores, is a tower top product in the steel industry all the time due to complex production process, strict manufacturing technology, long working procedure and many influencing factors, and is called as a steel artwork. When a user uses the oriented silicon steel to manufacture the transformer core, the oriented silicon steel strip needs to be cut and laminated, the quality of the laminated steel strip is affected when the plate type of the steel strip is poor, and the performance of the transformer is reduced, so that the requirement of the user on the plate type of the oriented silicon steel is very strict. At present, the condition of flanging of the upper end surface of an oriented silicon steel coil subjected to high-temperature annealing always exists, and the influence caused by the flanging is divided into two aspects, namely that the edge wave defect of a finished coil cannot be completely removed in the finished product process, the product grade is reduced, the step rate is increased, and the finished product process is forced to increase the edge shearing amount, so that the yield is reduced. The problem of flanging of the upper end surface of the oriented silicon steel after high-temperature annealing needs to be solved.
The shape of the upper end panel of the oriented silicon steel after high-temperature annealing is influenced by many factors, such as the raw material coil type, the coating water content, the inner cover state, the sealed sand state, the inner cover pressure and the like. When the oriented silicon steel is annealed at high temperature, a steel coil is placed in a closed inner cover, sand is sealed at the bottom end of the inner cover for sealing, protective gas with different proportions is introduced into the inner cover after the steel coil is placed in a furnace according to process requirements, on one hand, new protective gas needs to be continuously supplied into the inner cover from the outside, on the other hand, water vapor carried by a steel coil coating and waste gas generated in the high-temperature annealing process are diffused and discharged into the atmosphere through a sand sealing and diffusing system, meanwhile, relatively stable pressure is maintained in the inner cover, a supply and exhaust pipe is a sleeve formed by sleeving a large heat-resistant steel pipe and a small heat-resistant steel pipe with different calibers, the sleeve is placed at the bottom of the steel coil, small pipe air inlet and large pipe exhaust air outlet are carried out, because the upper end face of the steel coil is exposed outside, the protective gas is continuously injected into the inner cover from the bottom to the top, the waste gas generated in the annealing process is continuously discharged through the, the outer steel coil is not supported and protected by the inner and outer steel bands, bears positive pressure at high temperature for a long time, finally causes deformation of edges to form a flanging, and causes the defect of single edge wave of a finished coil, so the outer ring of the upper end face of the steel coil must be protected, and the stress deformation of the steel coil is reduced.
The protection of the upper end face of the high-temperature annealing steel coil needs to consider the problem of derivative defects, namely, new defects cannot be generated while flanging is eliminated, more typical derivative defects are surface oxidation of the steel coil, and various existing schemes lose feasibility due to breeding of oxidation defects because drainage in the temperature rising process of the steel coil is blocked, so that water vapor is locally gathered in the steel coil, and the reducing atmosphere of the part is damaged to cause oxidation.
Therefore, a new method for eliminating the single-side wave defect of the oriented silicon steel is urgently needed so as to protect the edge of the steel coil and avoid the surface oxidation of the steel coil.
Disclosure of Invention
The invention aims to provide a method for eliminating the single-side wave defect of oriented silicon steel, which can effectively protect the edge of a steel coil and prevent the upper end surface of the steel coil from flanging; the method can also discharge the moisture in the steel coil, and avoid the oxidation of the surface of the steel strip.
The technical scheme adopted by the invention is as follows:
a method for eliminating the single edge wave defect of oriented silicon steel comprises the following steps:
1) manufacturing a special cover plate; the special cover plate comprises an annular plate, and a plurality of shearing positions are arranged on the outer edge of the annular plate;
2) hoisting the oriented silicon steel coil to be charged to a high-temperature annealing furnace platform;
3) paving the special cover plate on the outer ring of the upper end surface of the oriented silicon steel coil;
4) bending each cut part on the special cover plate downwards to hook the outer edge of the oriented silicon steel coil so as to reduce the play of the cover plate in the high-temperature annealing process;
5) buckling an inner cover, sealing the contact part of the bottom edge of the inner cover and the furnace platform by using sealing sand, wherein the sealing sand cannot be hardened;
6) and feeding the steel coil into a furnace to finish the high-temperature annealing process.
According to the scheme, the annular plate consists of 2 semi-annular plates, and no obvious gap can be formed between the 2 semi-annular plates;
according to the scheme, three shearing positions are arranged on each semi-annular plate and are respectively arranged at two ends and the middle position.
According to the scheme, the width of the cut part is 100-150 mm, and the depth is 100-150 mm.
According to the scheme, the width of the annular plate is 300-600 mm; the outer diameter of the annular plate is 50-150 mm larger than the outer diameter of the steel coil.
According to the scheme, the pressure of the inner cover is 100-350 Pa.
According to the scheme, the annular plate is provided with the holes, so that water vapor in the steel coil can be conveniently discharged in the high-temperature annealing process.
The invention has the beneficial effects that:
the edge of the steel coil can be effectively protected by adopting a special cover plate and combining a conventional oriented silicon steel high-temperature annealing process, and the upper end surface of the steel coil is prevented from flanging; the method can also discharge the moisture in the steel coil, thereby avoiding the oxidation of the surface of the steel strip;
the special cover plate is arranged on the outer ring of the upper end face of the oriented silicon steel coil, and the pressure of the inner cover in the high-temperature annealing process is controlled at the same time, so that the effect of the deformation force of the outer ring of the steel coil is reduced, the problem of flanging during high-temperature annealing is thoroughly solved, the step rate is reduced by more than 80% due to the single-edge wave defect after the steel coil finished product is subjected to finishing and edge shearing, and meanwhile, the edge shearing amount can be reduced in the finishing process due to the improvement of the plate type of the edge part;
the special cover plate with a special structure and size is adopted, so that the water drainage in the process of heating the steel coil cannot be retarded, and derived defects cannot be propagated.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural view of a semi-annular plate;
FIG. 2 is a schematic view of a steel coil charging furnace;
FIG. 3 is the special cover plate arranged on the outer ring of the upper end surface of the steel coil;
in the figure: 1. an inner cover; 2. a special cover plate; 2.1, a semi-annular plate; 2.2, cutting off the position; 3. a steel coil; 4. a base plate; 5. a pillar; 6. an air inlet pipe; 7. sand sealing; 8. a furnace platform; 9. and (4) exhausting the gas.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1-3, the arrows in the figures represent the direction of flow of the shielding gas. A method for eliminating the single edge wave defect of oriented silicon steel comprises the following steps:
1) manufacturing a special cover plate according to the requirements of a drawing; the special cover plate comprises annular plates consisting of 2 semi-annular plates, and no obvious gap can be formed between the 2 semi-annular plates; the outer edge of each semi-annular plate is provided with three cutting positions which are respectively arranged at two ends and the middle position;
2) commanding the crown block to hoist and convey the oriented silicon steel coil to be charged to the high-temperature annealing furnace platform;
3) paving the special cover plate on the outer ring of the upper end surface of the oriented silicon steel coil, and tightly butting the joint;
4) bending each cut part on the special cover plate downwards to hook the outer edge of the oriented silicon steel coil so as to reduce the play of the cover plate in the high-temperature annealing process;
5) buckling an inner cover, sealing the contact part of the bottom edge of the inner cover and the furnace platform by using sealing sand, wherein the sealing sand cannot be hardened;
6) and feeding the steel coil into a furnace to finish the high-temperature annealing process.
In order to achieve better effect, the width of the cutting part is designed to be 130mm, and the depth is 140 mm; the width of the annular plate is designed to be 500 mm; the outer diameter of the annular plate is larger than the outer diameter of the steel coil by 100 mm; the internal shroud pressure was brought to 280 Pa.
To better illustrate the effects of the present invention, the following table specifically illustrates the analysis of comparative examples and inventive examples:
it will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (8)
1. A method for eliminating the single edge wave defect of oriented silicon steel is characterized by comprising the following steps:
1) manufacturing a special cover plate; the special cover plate comprises an annular plate, and a plurality of shearing positions are arranged on the outer edge of the annular plate;
2) hoisting the oriented silicon steel coil to be charged to a high-temperature annealing furnace platform;
3) paving the special cover plate on the outer ring of the upper end surface of the oriented silicon steel coil;
4) bending each cut part on the special cover plate downwards to hook the outer edge of the oriented silicon steel coil;
5) buckling an inner cover, and tightly covering the bottom of the inner cover by using sand seal;
6) and feeding the steel coil into a furnace to finish the high-temperature annealing process.
2. The method for eliminating the single-side wave defect of the oriented silicon steel as set forth in claim 1, wherein: the annular plate is composed of 2 semi-annular plates.
3. The method for eliminating the single-side wave defect of the oriented silicon steel as set forth in claim 1 or 2, wherein the method comprises the following steps: three cutting positions on each semi-annular plate are respectively arranged at two ends and the middle position.
4. The method for eliminating the single-side wave defect of the oriented silicon steel as set forth in claim 3, wherein: the width of the cut part is 100-150 mm, and the depth is 100-150 mm.
5. The method for eliminating the single-side wave defect of the oriented silicon steel as set forth in claim 1, wherein: the width of annular plate is 300 ~ 600 mm.
6. The method for eliminating the single-side wave defect of the oriented silicon steel as set forth in claim 1, wherein: the annular plate is provided with a hole.
7. The method for eliminating the single-side wave defect of the oriented silicon steel as set forth in claim 1, wherein: the outer diameter of the annular plate is 50-150 mm larger than the outer diameter of the steel coil.
8. The method for eliminating the single-side wave defect of the oriented silicon steel as set forth in claim 1, wherein: the pressure of the inner cover is 100-350 Pa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110006701.6A CN112831648A (en) | 2021-01-05 | 2021-01-05 | Method for eliminating single-side wave defect of oriented silicon steel |
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| CN202110006701.6A CN112831648A (en) | 2021-01-05 | 2021-01-05 | Method for eliminating single-side wave defect of oriented silicon steel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113862447A (en) * | 2021-09-15 | 2021-12-31 | 首钢智新迁安电磁材料有限公司 | Method, device, equipment and storage medium for controlling edge waves of oriented silicon steel |
| CN114085973A (en) * | 2021-11-16 | 2022-02-25 | 武汉钢铁有限公司 | Method for improving surface quality of inner ring, outer ring and edge part of oriented silicon steel and annular furnace |
| CN114277241A (en) * | 2022-01-05 | 2022-04-05 | 首钢智新迁安电磁材料有限公司 | Device for high-temperature annealing of oriented silicon steel and high-temperature annealing method of oriented silicon steel |
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| CN203007337U (en) * | 2012-11-14 | 2013-06-19 | 云南钛业股份有限公司 | Titanium and titanium alloy sheet stacking type bell type annealing furnace |
| CN107475504A (en) * | 2017-08-04 | 2017-12-15 | 北京首钢股份有限公司 | A kind of device and method for oriented silicon coil of strip high annealing |
| CN108070708A (en) * | 2017-11-22 | 2018-05-25 | 武汉钢铁有限公司 | For carrying out the insulation board of oriented steel the high temperature anneal combination unit and method |
| CN109112267A (en) * | 2018-10-23 | 2019-01-01 | 首钢智新迁安电磁材料有限公司 | A kind of low temperature high magnetic induction grain-oriented silicon steel high annealing method |
-
2021
- 2021-01-05 CN CN202110006701.6A patent/CN112831648A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203007337U (en) * | 2012-11-14 | 2013-06-19 | 云南钛业股份有限公司 | Titanium and titanium alloy sheet stacking type bell type annealing furnace |
| CN107475504A (en) * | 2017-08-04 | 2017-12-15 | 北京首钢股份有限公司 | A kind of device and method for oriented silicon coil of strip high annealing |
| CN108070708A (en) * | 2017-11-22 | 2018-05-25 | 武汉钢铁有限公司 | For carrying out the insulation board of oriented steel the high temperature anneal combination unit and method |
| CN109112267A (en) * | 2018-10-23 | 2019-01-01 | 首钢智新迁安电磁材料有限公司 | A kind of low temperature high magnetic induction grain-oriented silicon steel high annealing method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113862447A (en) * | 2021-09-15 | 2021-12-31 | 首钢智新迁安电磁材料有限公司 | Method, device, equipment and storage medium for controlling edge waves of oriented silicon steel |
| CN113862447B (en) * | 2021-09-15 | 2023-04-18 | 首钢智新迁安电磁材料有限公司 | Method, device, equipment and storage medium for controlling edge waves of oriented silicon steel |
| CN114085973A (en) * | 2021-11-16 | 2022-02-25 | 武汉钢铁有限公司 | Method for improving surface quality of inner ring, outer ring and edge part of oriented silicon steel and annular furnace |
| CN114277241A (en) * | 2022-01-05 | 2022-04-05 | 首钢智新迁安电磁材料有限公司 | Device for high-temperature annealing of oriented silicon steel and high-temperature annealing method of oriented silicon steel |
| CN114277241B (en) * | 2022-01-05 | 2023-07-28 | 首钢智新迁安电磁材料有限公司 | High-temperature annealing method of oriented silicon steel |
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Application publication date: 20210525 |