CN104368621A - Manufacturing method of metal plate - Google Patents
Manufacturing method of metal plate Download PDFInfo
- Publication number
- CN104368621A CN104368621A CN201410598512.2A CN201410598512A CN104368621A CN 104368621 A CN104368621 A CN 104368621A CN 201410598512 A CN201410598512 A CN 201410598512A CN 104368621 A CN104368621 A CN 104368621A
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- spinning
- cylinder
- cylinder base
- length
- base
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
-
- 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/14—Spinning
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a manufacturing method of a metal plate. A plate is obtained by spinning to mold a cylinder, splitting and flattening along the bus direction of the cylinder. One-pass or multi-pass spinning process is adopted; when multi-pass spinning is carried out, in order to recover the plasticity of materials to facilitate continuous spinning, thermal treatment is adopted during two passes so as to improve the material plasticity and reduce processing hardening; when final-passing spinning is carried out, in order to control the wall thickness of the spinning cylinder to be within the qualified range, a test spinning method is adopted, so that a plate meeting the requirement can be met. Because materials are subjected to plastic deformation, the mechanical performance is improved, so that performance of the plate subjected to flattening is superior to the performance of a cylinder blank before spinning. The manufacturing method of the metal plate is suitable for manufacturing plates with high precision and special wall-thickness specification, and can be used for manufacturing metal plates with different specifications flexibly.
Description
Technical field
The present invention relates to machine industry, specifically a kind of method for manufacturing different size sheet metal flexibly.
Background technology
Along with the development of machinery manufacturing industry, more and more diversified to the demand of sheet metal specification.Particularly for the individual demand of different-thickness stock board, market is difficult to meet.Adopt the method such as traditional cold, hot rolling to manufacture sheet material, often for production in enormous quantities, and the production cycle is long.Publication number is disclose a kind of steel plate and preparation method thereof in the innovation and creation of CN103820717A, describing a kind of smelting process by optimizing steel, making the steel plate of acquisition have excellent chemical element proportioning.By techniques such as smelting, continuous casting, rolling, heat treatments, manufacture the superhigh intensity of low-cost and easy-to welding, the wear-resisting steel plate of high tenacity.Publication number is disclose a kind of steel plate and preparation method thereof in the innovation and creation of CN103938101A, and the key step of the method is forging and hot rolling, pickling and cold-rolling, continuous annealing, obtains finished product.Publication number is disclose a kind of material flowability control method for metal sheet forming in the innovation and creation of CN103894468A, the method utilizes eddy current coil in the flange region inductive loop of sheet metal, and the region producing inductive loop is placed in containing the magnetic field perpendicular to the axial field component in plate face, under the acting in conjunction in eddy current and magnetic field, produce and be parallel to pointing to concave die cavity by sheet metal flange region or being pointed to the transversal electromagnetic force of sheet metal flange region by concave die cavity of plate face, this transversal electromagnetic force and axial plastic force cooperatively interact, realize the control to material flowability.Publication number is the forming method and the formation system that disclose a kind of sheet metal in the innovation and creation of CN103464679A, utilize the three-dimensional stereo model of computer software design sheet metal, utilize gypsum or sand mfg. moulding die, casting metals liquid, after molten metal coagulation forming, the demoulding obtains sheet metal.Said method adopts the processes such as casting or rolling to manufacture sheet metal mostly.
Summary of the invention
For mostly adopting the processes such as casting or rolling to manufacture sheet metal in prior art, the present invention proposes a kind of manufacture method of sheet metal.
Detailed process of the present invention is:
Step 1, manufactures the cylinder base of spinning cylinder.The appearance and size of spinning cylinder cylinder base comprises the diameter of a base, length and wall thickness.
The diameter D of described spinning cylinder cylinder base is determined by formula (1),
D＝a/π+△D (1)
According to the principle of plastic deformation constancy of volume, the cylinder base substrate that cylinder base length and wall thickness determine amasss the volume that should be greater than made sheet metal.The length of described spinning cylinder cylinder base and wall thickness relationship are determined by formula (2),
L＝tb(D+t)/(D+t
0)t
0+△L (2)
In formula (1) and formula (2), D is spinning cylinder base internal diameter, and △ D is spinning cylinder base internal diameter process allowance, and L is spinning cylinder base length, and △ L is spinning cylinder base length process surplus, t
0be a base thickness, t is the thickness of Forming Workpiece.
Step 2, mould pressing.
Adopt shear spinning forming technology to carry out spinning to spinning cylinder cylinder base, make its wall thickness reduction, length.Spinning pass can be a time also can be multi-pass.When limit attenuating rate close to material of total reduction of the continuous spinning of multi-pass, the plasticity of heat-treating methods restorer need be taked, be beneficial to follow-up continuation mould pressing.Material limits reduction ψ max determines according to ψ max ≈ ψ/(0.17+ ψ).The required thickness that the thickness of workpiece of final mould pressing is institute's panel.
Step 3, removes stub bar by the method for machining and rises and revolve place's flange clout.Cut along any generatrix direction of cylinder as line of cut.
Step 4, the cylinder smoothing of will cut with plate straightening roll.
The present invention is mainly used in the manufacture of high accuracy, special wall thickness specifications sheet material, can manufacture the sheet metal of different size flexibly.
The present invention is based on spinning forming process, and other householder methods can realize the manufacture of different size sheet metal in addition.Mould pressing belongs to plastic working, and therefore this method is applicable to the manufacture of the sheet metal with certain plasticity, as steel, copper, aluminium etc.
Spinning process is a kind of advanced manufacturing process combining the process characteristics such as forging, extruding, stretching, bending, looping mill rolling and roll extrusion.Mould pressing is a kind of Near net shape processing method, and its essence is pressed on blank for utilizing spinning roller to increase, rotary billet by external force along shaping dies carry out local gradually spreading produce plastic deformation and thinning, thus obtain high accuracy Thin-wall Revolving Part.This process characteristic makes employing the present invention manufacture sheet material becomes possibility.The wall thickness of spinning cylinder determines primarily of the gap of spinning roller and mould.Therefore by adjustment spinning clearance control wall thickness of cylinder, thus the sheet material of various thickness specification is manufactured flexibly.Because mould pressing cylinder is revolving parts, therefore spinning part can launch along any bus.Launch sheet material one side length to be determined by cylinder section girth, another side length is then the bus length of cylinder.Because spinning cylinder is enclosed within mould, barrel bore is substantially constant.According to the principle of plastic deformation constancy of volume, wall thickness of cylinder is thinning, and length is corresponding growth thereupon.Therefore can by design spinning cylinder base internal diameter, length and gauge, through rotary pressing processing, cylinder launches the sheet material length and width size that can obtain needing.The method can obtain the sheet material of certain length and width specification flexibly by design spinning cylinder base size.The sheet material of different-thickness specification can be obtained flexibly by controlling spinning cylinder wall thickness.
The present invention is by mould pressing cylinder, and the method then cut open along cylinder generatrix direction, flattened manufactures sheet material.According to the dimensions of the principle determination spinning cylinder base of constancy of volume.Spinning process can be a time also can be multi-pass.During multi-pass spinning, the plasticity in order to restorer is conducive to continuing spinning, and heat-treating methods can be adopted between passage to improve material plasticity, reduces work hardening.During last passage spinning, for controlling spinning cylinder wall thickness in acceptability limit, adopting the method for trying to revolve, namely measuring the wall thickness at spinning position after a bit of length of spinning, if meet wall thickness requirement, proceed spinning; If do not meet wall thickness requirement, then carry out examination again according to the springback capacity relation between the wall thickness of spun portion and given spinning gap again given spinning gap and revolve until wall thickness is qualified.Because material is through plastic deformation, mechanical performance gets a promotion.Thus the plate property through launching to obtain is better than the performance of spinning placket base.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of spinning cylinder base;
Fig. 2 is the schematic diagram of cylinder after rotary pressing processing;
Fig. 3 is the schematic diagram that removal clout is cut open along spinning cylinder generatrix direction, flattened.In figure:
1. a base; 2. cylinder; 3. flange line of cut; 4. stub bar line of cut; 5. pair cutting secant; 6. stub bar; 7. flange.
Detailed description of the invention
Embodiment one
The present embodiment is a kind of method manufacturing 30CrMnSiA steel board, and the specification of steel board is a × b × t=600 × 800 × 2.2+0.20mm, wherein: a is a length of side of sheet material, and b is another length of side of sheet material, and t is the thickness of sheet material.
Detailed process is:
Step 1, manufactures the cylinder base of spinning cylinder.Spinning cylinder blank is added by seamless pipe machine and forms.The appearance and size of spinning cylinder blank comprises the diameter of a base, length and wall thickness.Wherein:
Cylinder base diameter D is determined by formula (1),
D＝a/π+△D (1)
Cylinder base length L is determined by formula (2),
L＝tb(D+t)/(D+t
0)t
0+△L (2)
The limit attenuating rate of this material is determined according to formula (3),
ψ
max≈ψ/(0.17+ψ) (3)
In formula (1) and formula (2), D is spinning cylinder base internal diameter, and △ D is spinning cylinder base internal diameter process allowance, and L is spinning cylinder base length, and △ L is spinning cylinder base length process surplus, t
0be a base thickness, t is the thickness of shaping workpiece.
ψ in formula (3)
maxfor the limit attenuating rate of material, ψ is the contraction percentage of area of material.
In the present embodiment, cylinder base diameter D=600/ π+△ D ≈ 200mm.Cylinder base thickness t
0=8mm, 30CrMnSiA material limits reduction ψ
max≈ 0.45/ (0.17+0.45) ≈ 72.6%, spinning cylinder base is thinned to 2.2mm from 8mm, total reduction 72.5% close to the limit attenuating rate of material, heat treatment restorer plasticity of therefore once annealing between spinning pass.Cylinder base length L=2.2*800 (200+2.2)/(200+8) * 8+ △ L ≈ 250mm.
Step 2, mould pressing.
Power spinning machine carries out spinning by derotation process, is completed by three passage spinning.During spinning, spinning cylinder base is enclosed within spinning mold, and along with spinning mold rotation.Every time given different gap between spinning roller from spinning mold, spinning roller along spinning cylinder base axis direction with certain speed feeding.After such every time spinning of spinning cylinder base, thickness is thinning gradually, and length increases.Specifically:
First passage spinning parameter is as follows: the gap of spinning roller and spinning mold is 5.3 ~ 5.7mm, and the feed speed of spinning roller is 100 ~ 60mm/min, and the rotating speed of spinning mold is 100r/min.After first passage spinning, the wall thickness control of spinning cylinder is at 6.0 ~ 6.2mm.In the present embodiment, the gap of spinning roller and spinning mold is 5.5mm, and the feed speed of spinning roller is 80mm/min,
Second passage spinning parameter is as follows: the gap of spinning roller and spinning mold is 3.8 ~ 3.4mm, and the feed speed of spinning roller is 100 ~ 60mm/min, and the rotating speed of spinning mold is 100r/min.After second passage spinning, the wall thickness control of spinning cylinder is at 4.0 ~ 4.2mm.In the present embodiment, the gap of spinning roller and spinning mold is 3.6mm, and the feed speed of spinning roller is 80mm/min,
Carry out annealing in process to the cylinder after the second passage spinning, annealing temperature is 650 DEG C, is incubated after 30 minutes and is cooled to 600 DEG C of air coolings of coming out of the stove to room temperature with furnace temperature.Improved the work hardening of front two passage spinning cylinder materials by annealing in process, restorer plasticity, is conducive to the 3rd passage spinning.
First carry out examination in 3rd passage spinning to revolve, the parameter of trying to revolve is as follows: the gap of spinning roller and spinning mold is 1.5 ~ 1.9mm, and the feed speed of spinning roller is 70 ~ 110mm/min, and the rotating speed of spinning mold is 100r/min.When examination is revolved, stop spinning after spinning roller feeding 20mm length, the wall thickness measuring rotary pressure deformation partial cylinder is 2.3 ~ 2.4, meets the requirement of wall thickness 2.2+0.20mm, carries out follow-up spinning to terminating according to this parameter.In the present embodiment, the gap of spinning roller and spinning mold is 1.7mm, and the feed speed of spinning roller is 90mm/min,
After spinning, overall barrel length degree is 865mm, and effective length is 830mm, and residue stub bar is about 15mm; The length of described effective length to be wall thickness be 2.2+0.20; Described residue stub bar is the region that the halt distance spinning cylinder cylinder base end face of spinning roller feeding does not deform.Rise and revolve place due to material end face and cause flange length to be about 20mm without constraint.
Step 3, excises stub bar with plasma and rises and revolve place's flange.Along any generatrix direction of cylinder as line of cut, cut with plasma.
Step 4, the cylinder smoothing of will cut with plate straightening roll.Remove burr with edge planer, ensure 600mm × 800mm specification.
Embodiment two
The present embodiment is a kind of method manufacturing copper plate, and the specification of red copper sheet material is a × b × t=300 × 500 × 1.5+0.150mm, wherein: a is a length of side of sheet material, and b is another length of side of sheet material, and t is the thickness of sheet material.
Detailed process is:
Step 1, manufactures the cylinder base of spinning cylinder.Spinning cylinder blank is that copper rod machine adds and forms.The appearance and size of spinning cylinder cylinder base comprises the diameter of a base, length and wall thickness.
Wherein:
Cylinder base diameter D is determined by formula (1),
D＝a/π+△D (1)
Cylinder base length L is determined by formula (2),
L＝tb(D+t)/(D+t
0)t
0+△L (2)
The limit attenuating rate of this material is determined according to formula (3),
ψ
max≈ψ/(0.17+ψ) (3)
In the present embodiment, according to formula (1) cylinder base diameter D=300/ π+△ D ≈ 100mm, cylinder base thickness t
0=5mm, according to formula (3), red copper material limits reduction ψ
max≈ 0.65/ (0.17+0.65)=79.3%, the thickness of spinning cylinder base is thinned to 1.5mm from 5mm, and total reduction 70%, is less than the limit attenuating rate of material, therefore between spinning pass without the need to heat-treating.According to formula (2) cylinder base length L=1.5*500 (100+1.5)/(100+5) * 5+ △ L ≈ 190mm.
Step 2, mould pressing.
Power spinning machine carries out spinning by shear spinning process, is completed by two passage spinning.Design parameter is as follows:
First passage spinning parameter: the gap of spinning roller and spinning mold is 2.6mm, the feed speed of spinning roller is 100mm/min, and the rotating speed of spinning mold is 150r/min.After first passage spinning, the wall thickness of spinning cylinder is at 2.9 ~ 3.1mm.
Second passage spinning parameter: the gap of spinning roller and spinning mold is 1.2mm, the feed speed of spinning roller is 100mm/min, and the rotating speed of spinning mold is 150r/min.When examination is revolved, stop spinning after spinning roller feeding 20mm length, the wall thickness measuring rotary pressure deformation partial cylinder is 1.55 ~ 1.65mm, meets the requirement of wall thickness 1.5+0.15 0mm, carries out follow-up spinning to terminating according to this parameter.
Step 3, excises stub bar with plasma and rises and revolve place's flange.Along any generatrix direction of cylinder as line of cut, cut with plasma.
Step 4, the cylinder smoothing of will cut with plate straightening roll.Remove burr with edge planer, ensure 300mm × 500mm specification.
Embodiment three
The present embodiment is a kind of method manufacturing 3A21 aluminium sheet, and the specification of aluminium sheet sheet material is a × b × t=100 × 400 × 3.7 ± 0.2mm, wherein: a is a length of side of sheet material, and b is another length of side of sheet material, and t is the thickness of sheet material.
Detailed process is:
Step 1, manufactures the cylinder base of spinning cylinder:
Wherein:
Cylinder base diameter D is determined by formula (1),
D＝a/π+△D (1)
Cylinder base length L is determined by formula (2),
L＝tb(D+t)/(D+t
0)t
0+△L (2)
The limit attenuating rate of this material is determined according to formula (3),
ψ
max≈ψ/(0.17+ψ) (3)
In the present embodiment, spinning cylinder cylinder base adopts 3A21 aluminium sheet to revolve cup cylinder at the bottom of forming belt through general.The thickness of aluminium sheet is 8mm, diameter phi 260mm.The general thickness revolving the rear wall of cup that is shaped is 7.8 ~ 8.2mm.Cup shell diameter phi=150mm, the cup cylinder height of shaping is 55mm.According to formula (3), 3A21 material limits reduction ψ
max≈ 0.6/ (0.17+0.6)=77.9%, is thinned to 3.7mm by 8mm, and total reduction is 54%, much smaller than the limit attenuating rate of material, without the need to heat-treating therefore.
Step 2, mould pressing.
Power spinning machine adopts dextrorotation process carry out spinning, completed by two passage spinning.Design parameter is as follows:
First passage spinning parameter: the gap of spinning roller and spinning mold is 5.0 ± 0.2mm, the feed speed of spinning roller is 100 ± 20mm/min, and the rotating speed of spinning mold is 150r/min.After first passage spinning, the wall thickness 5.3 ~ 5.7mm of spinning cylinder.
Second passage spinning parameter: the gap of spinning roller and spinning mold is 3.4mm, the feed speed of spinning roller is 100 ± 20mm/min, and the rotating speed of spinning mold is 180r/min.When examination is revolved, spinning is stopped after spinning roller feeding 25mm length, the wall thickness measuring rotary pressure deformation partial cylinder is 3.7 ~ 4.0mm, local exceeds the wall thickness requirement upper limit, the gap of adjustment spinning roller and spinning mold is that 3.25 continuation try to revolve, the wall thickness measuring rotary pressure deformation partial cylinder is 3.6 ~ 3.9mm, and wall thickness meets the demands, and carries out follow-up spinning to terminating according to this parameter.
Step 3, excises at the bottom of cup and stub bar by oxy-acetylene flame cutting method.Along any generatrix direction of cylinder as line of cut, cut with plasma.
Step 4, the cylinder smoothing of will cut with plate straightening roll.Remove burr with edge planer, ensure 100mm × 400mm specification.
Claims (3)
1. a manufacture method for sheet metal, is characterized in that, detailed process is:
Step 1, makes the cylinder base of spinning cylinder: the appearance and size of cylinder base comprises the diameter of a base, length and wall thickness; Made cylinder base substrate amasss the volume that should be greater than made sheet metal;
Step 2, shear spinning is shaped: adopt shear spinning method to the cylinder base of the spinning cylinder obtained, by a time spinning or multi-pass spinning, make a base wall thickness reduction, length, be met the spinning cylinder of sheet metal thickness and length requirement;
When the reduction of spinning cylinder base is close to determined limit attenuating rate ψ max, cylinder base is heat-treated, the plasticity of restorer, be beneficial to continue mould pressing;
Step 3, making sheet: described making sheet be any bus of the spinning cylinder obtained as line of cut, carry out machine cuts and obtain after smoothing.
2. the manufacture method of sheet metal as claimed in claim 1, is characterized in that, the diameter D of described spinning cylinder cylinder base is determined by formula (1),
D＝a/π+△D (1)
The length of described spinning cylinder cylinder base and thickness relationship are determined by formula (2),
L＝tb(D+t)/(D+t
0)t
0+△L (2)
In formula (1) and formula (2), D is spinning cylinder base internal diameter, and △ D is spinning cylinder base internal diameter process allowance, and L is spinning cylinder base length, and △ L is spinning cylinder base length process surplus, t
0be a base thickness, t is the thickness of shaping workpiece, and a is the width of institute's panel, and b is the length of institute's panel.
3. the manufacture method of sheet metal as claimed in claim 1, is characterized in that, the limit attenuating rate ψ of described spinning cylinder cylinder base material
maxdetermined by formula (3);
ψ
max≈ψ/(0.17+ψ) (3)
ψ in formula (3)
maxfor the limit attenuating rate of material, ψ is the contraction percentage of area of material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410598512.2A CN104368621B (en) | 2014-10-30 | 2014-10-30 | A kind of manufacture method of sheet metal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410598512.2A CN104368621B (en) | 2014-10-30 | 2014-10-30 | A kind of manufacture method of sheet metal |
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| Publication Number | Publication Date |
|---|---|
| CN104368621A true CN104368621A (en) | 2015-02-25 |
| CN104368621B CN104368621B (en) | 2016-04-20 |
Family
ID=52547963
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|---|---|---|---|
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105363823A (en) * | 2015-12-02 | 2016-03-02 | 贵州安大航空锻造有限责任公司 | Method for rolling aluminum alloy sheet forge pieces |
| CN106865103A (en) * | 2017-04-16 | 2017-06-20 | 王海朋 | A kind of easy-to-assemble suspension type building waste treatment channel |
| CN107088657A (en) * | 2017-03-22 | 2017-08-25 | 郭和谦 | A kind of preparation method of the ultra-wide aluminium alloy sheet based on the metallurgical silumin of Rapid Solidification Powder |
| CN111331064A (en) * | 2020-03-11 | 2020-06-26 | 通裕重工股份有限公司 | Forming method of large-size plate forging |
| CN114161085A (en) * | 2021-11-23 | 2022-03-11 | 西安泰金工业电化学技术有限公司 | Manufacturing method of super-large-width spinning cathode roller |
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| GB556061A (en) * | 1942-07-21 | 1943-09-17 | Frederic Barnes Waldron | Improvements in the manufacture of iron and steel sheets |
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| JP2000190020A (en) * | 1998-12-22 | 2000-07-11 | Kobe Steel Ltd | Manufacture of plate and bar and manufacture of welded groove tube |
| CN102974676A (en) * | 2012-12-18 | 2013-03-20 | 西安航天动力机械厂 | Method for pressing conical cover reinforcing ribs |
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| GB556061A (en) * | 1942-07-21 | 1943-09-17 | Frederic Barnes Waldron | Improvements in the manufacture of iron and steel sheets |
| JPH02127918A (en) * | 1988-11-04 | 1990-05-16 | Yasuyoshi Fukui | Manufacture of plate-like inclining function material applying centrifugal casting method and unbending working method |
| JP2000190020A (en) * | 1998-12-22 | 2000-07-11 | Kobe Steel Ltd | Manufacture of plate and bar and manufacture of welded groove tube |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105363823A (en) * | 2015-12-02 | 2016-03-02 | 贵州安大航空锻造有限责任公司 | Method for rolling aluminum alloy sheet forge pieces |
| CN107088657A (en) * | 2017-03-22 | 2017-08-25 | 郭和谦 | A kind of preparation method of the ultra-wide aluminium alloy sheet based on the metallurgical silumin of Rapid Solidification Powder |
| CN106865103A (en) * | 2017-04-16 | 2017-06-20 | 王海朋 | A kind of easy-to-assemble suspension type building waste treatment channel |
| CN111331064A (en) * | 2020-03-11 | 2020-06-26 | 通裕重工股份有限公司 | Forming method of large-size plate forging |
| CN114161085A (en) * | 2021-11-23 | 2022-03-11 | 西安泰金工业电化学技术有限公司 | Manufacturing method of super-large-width spinning cathode roller |
| CN114161085B (en) * | 2021-11-23 | 2023-09-19 | 西安泰金新能科技股份有限公司 | Manufacturing method of spinning cathode roller with ultra-large width |
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|---|---|
| CN104368621B (en) | 2016-04-20 |
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