CN116651939A - Straightening and crack-stopping method for eliminating edge cracks during rolling of ultrathin strip - Google Patents
Straightening and crack-stopping method for eliminating edge cracks during rolling of ultrathin strip Download PDFInfo
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- CN116651939A CN116651939A CN202110017274.1A CN202110017274A CN116651939A CN 116651939 A CN116651939 A CN 116651939A CN 202110017274 A CN202110017274 A CN 202110017274A CN 116651939 A CN116651939 A CN 116651939A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000009467 reduction Effects 0.000 claims abstract description 22
- 239000007769 metal material Substances 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000005097 cold rolling Methods 0.000 claims abstract description 4
- 238000005336 cracking Methods 0.000 claims description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 2
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000009966 trimming Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 5
- 238000005056 compaction Methods 0.000 abstract 1
- 239000011888 foil Substances 0.000 description 9
- 230000008901 benefit Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- 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
- B21B1/40—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 foils which present special problems, e.g. because of thinness
-
- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/021—Rolls for sheets or strips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to the technical field of metal material processing, and discloses a straightening and crack-stopping method for eliminating edge cracks during rolling an ultrathin strip, which comprises the following steps of: step one: selecting materials: selecting a metal material with the thickness of 1-10 mm; step two: rough rolling with large rolling reduction: the thickness of the metal material in the first step is reduced to 0.1 mm-0.15 mm through 5-15 times of cold rolling; step three: small reduction plate shape adjustment rolling: after threading is completed, applying pre-compaction force of 50-200 kN, wherein the initial tension is 10-20% of the yield stress of the metal material with the same thickness, rolling the metal material with the same thickness through 1-4 times of small rolling reduction, wherein the rolling reduction of the metal material is 5-15%, and rolling the metal plate strip to the thickness of 0.09-0.075 mm; step four: edge crack straightening rolling: and adjusting the roll gap of the working roll until the roll end of the working roll is pressed against. The straightening and crack-stopping method for eliminating the edge cracks during rolling the ultrathin strip can effectively remove the edge crack defects in the rolling process of the ultrathin strip, eliminate the trimming process, greatly improve the stability of the rolling process, improve the yield of products and reduce the production cost.
Description
Technical Field
The invention relates to the technical field of metal material processing, in particular to a straightening and crack-stopping method for eliminating edge cracks during rolling of an ultrathin strip.
Background
The metal ultrathin strips are also called foil materials, and the regulations of different countries and industries on different kinds of foil materials are different. The maximum thickness of copper, steel, nickel and other metal foils specified in China is 0.05mm, while the maximum thickness of the fine adhesion gold foil specified in the United states is 0.127mm.
The foil is very widely used, for example, stainless steel and alloy foil are mainly used for parts of aviation, precision instruments and other departments; the iron core of the miniature high-frequency pulse transformer is generally made of an iron-nickel soft magnetic alloy foil; titanium alloy foils are commonly used in heat shields for aerospace planes; the hastelloy stainless steel foil can be used for spacers and long-size high-temperature superconducting cables of an engine; the copper foil can be used for a power battery of an electric automobile. High quality foil is one of the important markers of the micro-forming and micro-manufacturing capabilities of a country.
However, in the rolling process of the metal ultrathin belt, because the accumulated deformation is large, the edge of the rolled piece often generates serious crack defects, if the crack defects are not eliminated in time, belt breakage accidents are easy to occur, and the normal production is seriously influenced. Currently, most enterprises mainly use edge cutting shears to cut and remove edge cracks and defect areas (such as microcracks) possibly developing into cracks. However, although the process has a certain inhibiting effect on edge cracking during rolling after trimming, the process has no effect on edge cracking during rolling pass before trimming, and can not completely avoid strip breakage, and the trimming can reduce the yield of extremely thin strips, so that the economic benefit of enterprises is seriously affected.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a straightening and crack-stopping method for eliminating edge cracks when rolling an ultrathin strip, which has the advantage of eliminating the edge cracks, and solves the problems that the edge cracks do not act on rolling passes before trimming at present, the strip breakage cannot be completely avoided, the yield of the ultrathin strip can be reduced by trimming, and the economic benefit of enterprises is seriously influenced.
(II) technical scheme
In order to achieve the purpose of eliminating edge cracks, the invention provides the following technical scheme: a straightening and crack-stopping method for eliminating edge cracks when rolling an ultrathin strip comprises the following steps:
step one: selecting materials: selecting a metal material with the thickness of 1-10 mm;
step two: rough rolling with large rolling reduction: the thickness of the metal material in the first step is thinned to 0.1 mm-0.15 mm through 5-15 times of cold rolling;
step three: small reduction plate shape adjustment rolling: after threading is completed, applying precompaction force of 50-200 kN, wherein the initial tension is 10-20% of the yield stress of the metal material with the same thickness, rolling the metal material with the same thickness by 1-4 times of small rolling reduction, wherein the rolling reduction of the time is 5-15%, and rolling the metal plate belt to the thickness of 0.09-0.075 mm;
step four: edge crack straightening rolling: adjusting the roll gap of the working roll until the roll end of the working roll is pressed against, compacting the edge of the thin strip, and further thinning the metal thin strip in the third step to 0.05-0.01 mm by utilizing the specially designed working roll; the edge of the thin strip is subjected to three-dimensional compressive stress by utilizing an edge negative roll gap rolling method, so that edge cracks caused by oversized deformation are converted into U-shaped from V-shaped due to transverse flow of metal under the action of the three-dimensional compressive stress in the rolling process;
step five: the metal at the bottom of the U-shaped crack flows towards the edge according to the Mises flow rule, and the crack is gradually straightened, so that the purpose of eliminating the crack at the edge is achieved.
Preferably, the metal material is oxygen-free copper, high-purity titanium, nickel and magnesium alloy.
Preferably, the diameter of the working roller in the third step is 90-300 mm, and the length is 200-600 mm.
Preferably, the diameter of the working roll is 20-90 mm, the width of the roll surface is 100-650 mm, and the curve of the roll surface of the working roll is a piecewise function:
wherein: b-width of rolled piece; h-thickness of rolled piece; l-roll surface length.
Preferably, in the rolling process of the step two, the convexity of the lower working roll is 0-2 mu m, and the convexity of the upper working roll is 40-70 mu m.
(III) beneficial effects
Compared with the prior art, the invention provides a straightening and crack-stopping method for eliminating edge cracks when rolling an ultrathin strip, which has the following beneficial effects:
according to the straightening crack-stopping method for eliminating the edge cracks during rolling of the ultrathin strip, in the process of rolling of the ultrathin strip, a three-step method of rough rolling with large rolling reduction, plate shape adjusting rolling with small rolling reduction and edge crack straightening rolling is adopted, and a plurality of sections of variable-order curve convexity working rolls are combined, so that the edge cracks of the ultrathin strip can be effectively straightened, the purpose of eliminating the edge cracks is achieved, the production efficiency of the ultrathin strip is improved, the production cost is reduced, the economic benefit of enterprises is improved, and a strong pushing effect is provided for the development of the rolling process of the ultrathin strip.
Drawings
FIG. 1 is a schematic diagram of a conventional rolling process (a) and a negative roll gap rolling process (b);
FIG. 2 is a schematic diagram of rough rolling with large rolling reduction, plate shape adjusting rolling with small rolling reduction and edge crack straightening rolling process in sequence from left to right;
FIG. 3 is a graph of a multi-segment variable-order roll surface;
FIG. 4 is a graph of the 1/4 surface of a 50X 250mm specially designed roll.
FIG. 5 is a graph of the crack propagation process at the edge of an ultrathin strip.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-4, a method for straightening and stopping cracking for eliminating edge cracks during rolling of an ultrathin strip comprises the following steps:
step one: selecting materials: selecting industrial pure titanium with the thickness of 8mm and the width of 120 mm;
step two: rough rolling with large rolling reduction: the thickness of the metal material in the first step is reduced to 0.15mm through 12 times of cold rolling, wherein the convexity of the lower working roll is 2 mu m, and the convexity of the upper working roll is 50 mu m in the rolling process;
step three: small reduction plate shape adjustment rolling: after threading is completed, applying pre-compression force of 100kN, wherein the initial tension is 15% of the yield stress of the metal material with the same thickness, the diameter of a working roll is 90mm, the length of the working roll is 200mm, the rolling is carried out by 2-pass small rolling reduction, the pass rolling reduction is 10%, and the metal plate strip is rolled to the thickness of 0.08mm;
step four: edge crack straightening rolling: adjusting the roll gap of the working roll until the roll end of the working roll is pressed against, compacting the edge of the thin strip, and further thinning the metal thin strip in the third step to 0.05mm by utilizing the specially designed working roll; the edge of the thin strip is subjected to three-dimensional compressive stress by utilizing an edge negative roll gap rolling method, so that edge cracks caused by oversized deformation are converted into U-shaped from V-shaped due to transverse flow of metal under the action of the three-dimensional compressive stress in the rolling process;
step five: the metal at the bottom of the U-shaped crack flows towards the edge according to the Mises flow rule, and the crack is gradually straightened, so that the purpose of eliminating the crack at the edge is achieved.
The third step is that the convexity roller is specially designed, the diameter of the working roller is 20-90 mm, the width of the roller surface is 100-650 mm, and the curve of the 1/4 roller surface of the working roller is a piecewise function:
wherein: b-width of rolled piece; h-thickness of rolled piece; l-roll surface length.
In summary, the method for eliminating edge crack and straightening crack stop during rolling of the ultrathin strip adopts a three-step method of rough rolling with large rolling reduction, plate shape adjusting rolling with small rolling reduction and edge crack and straightening rolling, and combines a multi-section variable-order curve convexity working roll, so that the edge crack of the ultrathin strip can be effectively straightened, the purpose of eliminating the edge crack is achieved, the production efficiency of the ultrathin strip is improved, the production cost is reduced, the economic benefit of enterprises is improved, and the method has a strong pushing effect on the development of the rolling process of the ultrathin strip.
It should be noted that the term "comprises," "comprising," or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The straightening and crack-stopping method for eliminating edge cracks during rolling of the ultrathin strip is characterized by comprising the following steps of:
step one: selecting materials: selecting a metal material with the thickness of 1-10 mm;
step two: rough rolling with large rolling reduction: the thickness of the metal material in the first step is thinned to 0.1 mm-0.15 mm through 5-15 times of cold rolling;
step three: small reduction plate shape adjustment rolling: after threading is completed, applying precompaction force of 50-200 kN, wherein the initial tension is 10-20% of the yield stress of the metal material with the same thickness, rolling the metal material with the same thickness by 1-4 times of small rolling reduction, wherein the rolling reduction of the time is 5-15%, and rolling the metal plate belt to the thickness of 0.09-0.075 mm;
step four: edge crack straightening rolling: adjusting the roll gap of the working roll until the roll end of the working roll is pressed against, compacting the edge of the thin strip, and further thinning the metal thin strip in the third step to 0.05-0.01 mm by utilizing the specially designed working roll; the edge of the thin strip is subjected to three-dimensional compressive stress by utilizing an edge negative roll gap rolling method, so that edge cracks caused by oversized deformation are converted into U-shaped from V-shaped due to transverse flow of metal under the action of the three-dimensional compressive stress in the rolling process;
step five: the metal at the bottom of the U-shaped crack flows towards the edge according to the Mises flow rule, and the crack is gradually straightened, so that the purpose of eliminating the crack at the edge is achieved.
2. The method for straightening and stopping cracking during rolling of an ultrathin strip according to claim 1, wherein the method comprises the following steps of: the metal material is oxygen-free copper, high-purity titanium, nickel and magnesium alloy.
3. The method for straightening and stopping cracking during rolling of an ultrathin strip according to claim 1, wherein the method comprises the following steps of: the diameter of the working roll in the third step is 90-300 mm, and the length is 200-600 mm.
4. The method for straightening and stopping cracking during rolling of an ultrathin strip according to claim 1, wherein the method comprises the following steps of: the diameter of the working roll is 20-90 mm, the width of the roll surface is 100-650 mm, and the curve of the roll surface of the working roll is a piecewise function:
wherein: b-width of rolled piece; h-thickness of rolled piece; l-roll surface length.
5. The method for straightening and stopping cracking during rolling of an ultrathin strip according to claim 1, wherein the method comprises the following steps of: in the rolling process of the step two, the convexity of the lower working roll is 0-2 mu m, and the convexity of the upper working roll is 40-70 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110017274.1A CN116651939A (en) | 2021-01-07 | 2021-01-07 | Straightening and crack-stopping method for eliminating edge cracks during rolling of ultrathin strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110017274.1A CN116651939A (en) | 2021-01-07 | 2021-01-07 | Straightening and crack-stopping method for eliminating edge cracks during rolling of ultrathin strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116651939A true CN116651939A (en) | 2023-08-29 |
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| CN202110017274.1A Pending CN116651939A (en) | 2021-01-07 | 2021-01-07 | Straightening and crack-stopping method for eliminating edge cracks during rolling of ultrathin strip |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104561485A (en) * | 2014-12-31 | 2015-04-29 | 南阳汉冶特钢有限公司 | Production method for rolling crack-free steel plate |
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- 2021-01-07 CN CN202110017274.1A patent/CN116651939A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104561485A (en) * | 2014-12-31 | 2015-04-29 | 南阳汉冶特钢有限公司 | Production method for rolling crack-free steel plate |
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