CN101528951B - Unidirectional magnetic steel sheet excellent in iron loss characteristic - Google Patents
Unidirectional magnetic steel sheet excellent in iron loss characteristic Download PDFInfo
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- CN101528951B CN101528951B CN2007800391681A CN200780039168A CN101528951B CN 101528951 B CN101528951 B CN 101528951B CN 2007800391681 A CN2007800391681 A CN 2007800391681A CN 200780039168 A CN200780039168 A CN 200780039168A CN 101528951 B CN101528951 B CN 101528951B
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
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- 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
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
- C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1294—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a localized treatment
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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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- H—ELECTRICITY
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
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- H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14708—Fe-Ni based alloys
- H01F1/14716—Fe-Ni based alloys in the form of sheets
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Abstract
A unidirectional magnetic steel sheet excellent in iron loss to conventional is produced by dividing the iron loss of a unidirectional magnetic steel sheet into which strain is introduced by laser beam application into the hysteresis loss and the eddy current loss and quantitatively and adequately controlling the distributions including the direction of the sheet thickness of the strain and the residual stress in view of the eddy current loss. By applying a laser beam or the like, linear strain generally perpendicular to the rolling direction is introduced into a unidirectional magnetic steel sheet uniformly in the direction of the sheet thickness and periodically in the rolling direction to control the magnetic domains. The strain is so introduced that the integral of the compression residual stress in the rolling direction computed in the region of the cross-section where the compression residual stress is present lies in a predetermined range, in the two-dimensional distribution of the residual stress in the rolling direction caused near one strain-introduced portion in the cross-section perpendicular to the direction of the sheet width.
Description
Technical field
The present invention relates to implement the one-way electromagnetic steel plate of the excellent in iron loss characteristic of magnetic domain control by importing unrelieved stresss such as laser radiations.
Background technology
Have the one-way electromagnetic steel plate of easy magnetizing axis in the rolling direction of steel plate, mainly be used to the iron core of transformer etc., from the viewpoint of save energy, strong request reduces iron loss unshakable in one's determination in recent years.
Iron loss (the iron loss of electro-magnetic steel plate; Iron loss), roughly comprise magnetic hysteresis loss and eddy-current loss.Known magnetic hysteresis loss is influenced by crystalline orientation, defective, crystal boundary etc., and in addition, eddy-current loss is influenced by thickness of slab, resistance, magnetic domain width etc.There is the limit in the method for controlling in order to reduce magnetic hysteresis loss and improving crystalline orientation, and therefore, in recent years in order to reduce the eddy-current loss that accounts for more iron loss, once having proposed more magnetic domain width sectionalization is the magnetic domain control techniques.
As its method, in the special fair 6-19112 communique of Japan, the manufacture method as one-way electromagnetic steel plate had once proposed: by the YAG laser radiation, periodically import linear strain with the rolling direction approximate vertical in rolling direction, reduce the method for iron loss.The principle that is called as this method of laser magnetic domain control is, results from the surface strains that is caused by scanning ground illuminating laser beam, and 180 ° of magnetic domain width are segmented, and can reduce iron loss.
In addition, in TOHKEMY 2005-248291 communique, proposed to be conceived to peaked new departure of the unrelieved stress of the rolling direction that forms at surface of steel plate.
Summary of the invention
About import partial strain to surface of steel plate, the sectionalization of 180 ° of magnetic domain width is reduced this laser magnetic domain control of iron loss, comprise as most of motion prior art patent document 1, up to now, the result who attempts, further define the more radiation parameters such as kind, laser beam condensation point shape, laser energy density, laser radiation interval of laser, the content of motion is very unilateral, lacks unity.Its reason is: do not relate to as the strain of the principal element that causes magnetic domain sectionalization, reduction iron loss or the quantitative discussion of unrelieved stress.Say, improving by laser radiation aspect the iron loss, even identical illuminate condition, according to the specific absorption (forming decision) of steel plate, the difference of leather film thickness by optical maser wavelength, surface texture, shape, epithelium, can be also different by laser to the conversion of heat energy (temperature distribution, temperature course), even therefore laser irradiation condition is identical, because the proterties difference of steel plate, the strain of importing is also different.And even identical heat energy (temperature distribution, temperature course), because composition (for example Si content) difference of steel plate, physics value (for example Young's modulus, yield value of stress) is also different, so unrelieved stress is also different.Therefore, promptly allow to obtain laser irradiation condition for the best of the steel plate of certain condition, as long as it is the state of tunicle changes a little, also different by the strained mode of entrance that laser causes, core loss value can change, so lasing condition is not corresponding one to one with the reduction of iron loss.Therefore, for iron loss, require to find more essential factor of influence.Though speak of to patent documentation 2 quantitative property unique strain, unrelieved stress, if just only control strain, the stretching unrelieved stress of surface of steel plate, then there is the limit in the reduction of iron loss.
Problem of the present invention is, the iron loss of one-way electromagnetic steel plate is divided into magnetic hysteresis loss and eddy-current loss, especially from the viewpoint of eddy-current loss, not only surperficial, also comprise inner thickness of slab direction, quantitatively with the suitable condition controlling strain and the distribution of unrelieved stress, provide thus compared with the past aspect iron loss the one-way electromagnetic steel plate of excellence.
Present inventors carry out the experiment of magnetic domain control, import strain, unrelieved stress by laser radiation etc. to one-way electromagnetic steel plate, diligently study the distribution of the unrelieved stress that inquiry agency imports for the low iron loss one-way electromagnetic steel plate that obtains.It found that, if find the dependency between unrelieved stress and the eddy-current loss, carries out compression stress value and the control of answering changing distance, just can realize the one-way electromagnetic steel plate of excellent in iron loss characteristic.Main idea of the present invention is as follows.
(1) a kind of one-way electromagnetic steel plate, thereby be to have one-way electromagnetic steel plate with the linear strain of rolling direction approximate vertical by the irradiation continuous-wave laser beam, described linear strain, with the vertical direction of rolling direction be that plate is transversely even, and on rolling direction, be periodically, this one-way electromagnetic steel plate is characterised in that, near the compressive residual stress of the rolling direction that place strain introduction part, produces, with the horizontal vertical cross section of plate on bivariate distribution in, with the compressive residual stress of rolling direction in the regional integrates that has compressive residual stress in this cross section and the value that obtains is 0.20N～0.80N.
(2) according to above-mentioned (1) described one-way electromagnetic steel plate, it is characterized in that, by laser beam irradiation cause above-mentioned plate transversely strain uniformly on the rolling direction, periodically be spaced apart 2mm～8mm.
Description of drawings
Fig. 1 is the mode chart that is used for the device of one-way electromagnetic steel plate manufacture method of the present invention.
Fig. 2 is near the bivariate distribution of unrelieved stress on rolling direction/thickness of slab direction cross section of the rolling direction the laser irradiating position.
Fig. 3 is the maximum value and the iron loss W of the stretching unrelieved stress of rolling direction
17/50Graph of a relation.
Fig. 4 is the graph of a relation (the irradiation fixed interval is at 4mm) of integration compression stress value σ S and eddy-current loss We.
Fig. 5 is integration compression stress value σ S and iron loss W
17/50Graph of a relation (irradiation fixed interval at 4mm).
Fig. 6 is irradiation PL and iron loss W at interval
17/50Graph of a relation (the irradiation diameter DC that the irradiation diameter DL of rolling direction is fixed on 0.1mm, scanning direction is fixed on 0.5mm).
Fig. 7 is the maximum value and the iron loss W of the compressive residual stress of rolling direction
17/50Graph of a relation.
Embodiment
Present inventors are at the surface irradiation laser to one-way electromagnetic steel plate, thereby the linear strain that imports at certain intervals on rolling direction with the rolling direction approximate vertical improves in the method for iron loss, for various laser irradiation conditions, be conceived to the horizontal vertical cross section of plate on the bivariate distribution of unrelieved stress of rolling direction and the laser radiation of rolling direction (spacing) at interval, found the condition that can obtain the one-way electromagnetic steel plate of excellent in iron loss characteristic.At this, plate laterally is and the vertical direction of rolling direction.Import the method for linear strain as described above as surface to one-way electromagnetic steel plate, except laser irradiation, can also list ion implantation, electrodischarge machining(E.D.M.) method, local electroplating method, ultrasonic vibration method etc., this condition all is suitable for for adopting any method to import the strained one-way electromagnetic steel plate.Below with accompanying drawing the one-way electromagnetic steel plate that obtains by laser radiation of the present invention is described.
Fig. 1 is the explanatory view of the laser light irradiation method that the present invention relates to.In the present embodiment, use polygon mirror 4 and f θ lens 5, will shine on the one-way electromagnetic steel plate 1 by the laser beam LB scanning of the continuous oscillation (CW) of laser aid 3 outputs.By the distance between change f θ lens 5 and the one-way electromagnetic steel plate 1, and the rolling direction optically focused diameter d 1 of laser beam is changed.The 6th, cylindrical lens or a plurality of cylinder group lens, focal point about laser beam, optically focused diameter (scanning direction length) dc of the scanning direction (horizontal with the vertical plate of rolling direction) of light beam is changed, be used to control the optically focused shape from circle to ellipse.Average irradiation energy density Ua[mJ/mm
2], use laser power P[W], plate transverse scan (scan) the speed Vc[m/s of the horizontal laser beam of plate], the laser radiation of rolling direction PL[mm at interval], be defined as: Ua (mJ/mm
2)=P/ (Vc * PL).Laser scanning speed is by the decision of the speed of rotation of polygon mirror, therefore, can make laser power, polygon mirror speed of rotation, laser radiation interval variation and averages the adjustment of irradiation energy density.Fig. 1 has been to use the example of one group of laser and laser beam flying device, but also can transversely dispose many same devices at plate according to the plate width of steel plate.
It is the continuous oscillation fiber laser device of 10 μ m that present inventors use fiber core diameter, various combinations by focal point shape and average irradiation energy density Ua change illuminate condition, to the one-way electromagnetic steel plate surface, with the direction of rolling direction approximate vertical with the wire scanning laser beam, implement the experiment of laser radiation.Bivariate distribution and the iron loss and the magnetic hysteresis loss of the unrelieved stress of the rolling direction on mensuration and the horizontal vertical cross section of plate are separated into magnetic hysteresis loss with iron loss and eddy-current loss is investigated.With the mensuration of the bivariate distribution of the unrelieved stress of rolling direction on the horizontal vertical cross section of plate, be to adopt X-ray diffraction method to measure spacing of lattice, use the physics value of Young's modulus etc. to convert stress to.Iron loss adopts SST (monolithic tester; Single Sheet Tester) tester is measured W
17/50W
17/50Iron loss when being frequency 50Hz, peakflux density 1.7T.For the one-way electromagnetic steel plate sample that uses in the present embodiment, be under the situation of 0.23mm at thickness of slab, prelaser W
17/50Be 0.86W/kg.Magnetic hysteresis loss calculates according to magnetic hysteresis loop, and eddy-current loss is for to deduct the value that magnetic hysteresis loss obtains from above-mentioned iron loss.
The compressive residual stress that Fig. 2 is illustrated near the rolling direction that produces the laser irradiating position with the horizontal vertical cross section of plate on the representational example of bivariate distribution.About the steel plate that can see that iron loss is improved, though according to laser irradiation condition, the absolute value of unrelieved stress there are differences, and has bigger tensile stress near surface of steel plate, in the following existence that can see stress under compression of its thickness of slab direction.Moreover, there is the width of the rolling direction of unrelieved stress and plastix strain, roughly proportional with the rolling direction diameter d 1 of laser focusing point.
Present inventors are for the steel plate that uses the continuous oscillation laser apparatus to carry out laser radiation, and the stretching unrelieved stress of surface of steel plate and the maximum value of compressive residual stress and the relation of iron loss are investigated.The maximum value of stretching unrelieved stress and the relation of iron loss are shown in Fig. 3, the maximum value of compressive residual stress and the relation of iron loss are shown in Fig. 7.About stretching unrelieved stress maximum value, can't see and/or optimum value relevant with iron loss.On the other hand, about the maximum value of compressive residual stress, be the 100MPa that is represented by long and short dash line when above, iron loss is good, but higher limit and unclear.Its result, the iron loss in the magnetic domain of being undertaken by the laser radiation control can not describe with the maximum value of stretching unrelieved stress, also can not describe with the maximum value of compressive residual stress fully.Can expect the possibility that the additional features amount exists.
Therefore, the result of the careful investigation of present inventors data as first starting point, is conceived to: the maximum value of stretching unrelieved stress than the compression unrelieved stress big and stretching residual stress concentrations in narrow region; Reaching yielding stress according to illuminate condition is the plastix strain zone; On the other hand, the maximum value of compressive residual stress and iron loss can be seen many relations, as second starting point, are conceived to: even the maximum value of compressive residual stress is identical, compressive residual stress be distributed in exist in the expansion of depth direction different.That is, realize that iron loss reduces and the principal element of magnetic domain sectionalization, consider from first starting point, significant is not tensile stress, but stress under compression is considered from second starting point, significant is not the maximum value of unrelieved stress, but the expansion that distributes.
Present inventors as characteristic quantity " integration compression stress value σ S ", define as shown in the formula (1) when the distribution of the stress under compression of expression realization reduction iron loss like that.
σS＝∫
S?σds ...(1)
Promptly, near laser irradiating part, near the compressive residual stress of the rolling direction that produces the strain introduction part just, in the bivariate distribution on the cross section horizontal perpendicular to plate, about integration compression stress value σ S[N], the compressive residual stress of rolling direction is made as σ [MPa], the zone that has compressive residual stress in this cross section is made as S[mm
2], surface elemant is made as ds, σ S is defined as that in region S counter stress σ carries out integration and the value that obtains.That is, the integration compression stress value is the summation of the compressive residual stress that imports by laser radiation.
The laser radiation interval PL of rolling direction is made as 4mm (constant), laser focusing is put shape to be made as: 20 * 2500 μ m, 100 * 500 μ m, 100 * 2000 μ m, 300 * 200 μ m, about for this each situation, the one-way electromagnetic steel plate that changes laser power interimly and shone adopts aforesaid method to obtain the integration compression stress value.On the other hand, the iron loss by measuring for each situation deducts magnetic hysteresis loss, obtains eddy-current loss.Fig. 4 is for each electro-magnetic steel plate, draws eddy-current loss We at drawing integration compression stress value σ S on the X-coordinate, on ordinate zou, thus the figure of expression the relationship of the two.From this result, integration compression stress value and eddy-current loss, regardless of the focal point shape, all inversely proportional relation.The reduction that this means eddy-current loss is that sectionalization effect in magnetic domain district is proportional with the summation of the compressive residual stress that is imported.Investigate this phenomenon from the physical property principle, as described below.Magnetoelastic energy E:
E＝-C×σ×M×cos
2θ
Wherein, C is a constant, and σ is a unrelieved stress, and M is a magnetic moment, and θ is the angle that σ and M constitute.At this moment, under the situation that has compressive residual stress on the rolling direction, therefore E minimum when θ is 90 ° notices that σ is a negative value, and the direction of magnetic moment is vertical with rolling direction.Therefore, because stress under compression, easy magnetizing axis also can produce in its vertical direction not only in rolling direction.Usually, it is called as the circulation magnetic domain.If there is the circulation magnetic domain, then magnetostatic energy increases, and becomes unstable, therefore can consider the magnetic domain sectionalization, carries out stabilization thereby reduce magnetostatic energy.Therefore can think that the circulation magnetic domain is many more, i.e. strong the and generation broadly of compressive residual stress, then magnetic domain sectionalization effect is high more, and eddy-current loss reduces more.
Fig. 5 is to use the data used and the iron loss of mensuration in Fig. 4, at drawing integration compression stress value σ S on the X-coordinate, draw on ordinate zou and arrive iron loss W
17/50Thereby, the figure of expression the relationship of the two.From this result, in scope, with the iron loss W before the magnetic domain control by the 0.20N shown in the long and short dash line≤σ S≤0.80N
17/50=0.86W/kg compares, and can realize that by the iron loss improvement rate shown in the dotted line be (W more than 13%
17/50≤ 0.75W/kg) this good iron loss.Moreover iron loss improvement rate η is defined as: η (%)={ iron loss of (iron loss of material-arrival iron loss)/material } * 100.Since at integration compression stress value σ S during less than 0.20N, the eddy-current loss height, so iron loss can not reduce.Can think, at integration compression stress value σ S during,, because the plastix strain that causes by the stretching unrelieved stress of near surface, so the magnetic hysteresis loss increase, can not reduce iron loss though eddy-current loss reduces greater than 0.80N.As previously discussed as can be known, if integration compression stress value σ S is adjusted to the scope of 0.20N≤σ S≤0.80N, then can obtains good iron loss and improve.If more preferably be adjusted to the scope of 0.40N≤σ S≤0.70N as can be known, the effect of the iron loss that then can be further improved.
In described in front, with the laser radiation of rolling direction at interval PL be fixed on 4mm and carry out, but the laser radiation that further changes rolling direction PL and investigated its influence at interval.At this moment, the focal point shape of laser beam is that the rolling direction diameter is that 0.1mm, scanning direction (plate is horizontal) diameter are 0.5mm, adjusts Ua and makes that integration compression stress value σ S is the scope of 0.20N≤σ S≤0.80N.Fig. 6 is drawing the laser radiation interval PL of rolling direction, drawing iron loss W on ordinate zou on the X-coordinate
17/50Thereby the figure of expression the relationship of the two.From this result, PL can realize that iron loss improvement rate is 13% good iron loss when being the scope of 2mm～8mm.When PL was scope less than 2mm, magnetic hysteresis loss increased, and therefore can not reduce iron loss.When PL is scope greater than 8mm, can not reduce eddy-current loss, therefore can not reduce iron loss.If as described above the laser radiation interval PL of rolling direction is adjusted to the scope of 2mm≤PL≤8mm as can be known, then can obtains the improvement of good iron loss.
Embodiment 1
Use the one-way electromagnetic steel plate of thickness of slab, adopt continuous wave laser this surface of steel plate to be shone, after the mensuration unrelieved stress, calculate the integration compression stress value, measure iron loss (W separately with illuminate condition as shown in table 1 as 0.23mm
17/50).The results are summarized in table 1.In present embodiment 1, the laser radiation fixed interval that laser power is fixed on 200W, rolling direction is shone at 4mm.The calculating of integration compression stress value is to use X-ray diffraction method to measure the unrelieved stress (strain) of rolling direction, is tried to achieve by formula (2) for stress under compression.
Know clearly by table 1, electro-magnetic steel plate shown in test No.1～No.8 (example of the present invention), therefore the integration compression stress value σ S of its rolling direction can be reduced to the low core loss value (W as iron loss improvement rate 13% all at scope 0.20N given to this invention≤σ S≤0.80N
17/50) below the 0.75W/kg.On the other hand, the electro-magnetic steel plate shown in test No.9～No.12 (comparative example) of disengaging condition and range 0.20N≤σ S≤0.80N can not be realized low core loss value (W
17/50) below the 0.75W/kg.So, if adopt the present invention, then can access the one-way electromagnetic steel plate of excellent in iron loss characteristic.
To thickness of slab is the surface of the one-way electromagnetic steel plate of 0.23mm, and the illuminate condition irradiation continuous wave laser with as shown in table 2 after the unrelieved stress of mensuration irradiation portion, calculates the integration compression stress value, and measures iron loss (W
17/50), these numerical value are summarized in table 2.In present embodiment 2, laser power is fixed as the 200W identical with embodiment noted earlier and carries out.
Know clearly by table 2, electro-magnetic steel plate shown in test No.1～No.6 (example of the present invention), the integration compression stress value σ S of its rolling direction and the laser radiation of rolling direction be (answering changing distance) PL at interval, all, therefore can be reduced to low core loss value (W as iron loss improvement rate 13% at scope 0.20N given to this invention≤σ S≤0.80N, 2mm≤PL≤8mm
17/50) below the 0.75W/kg.On the other hand, though integration compression stress value σ S satisfies condition, test No.7 that the condition of irradiation interval PL departs from and the electro-magnetic steel plate shown in the No.8 can not be realized low core loss value (W
17/50) below the 0.75W/kg.So, if adopt the present invention, then can access the one-way electromagnetic steel plate of excellent in iron loss characteristic.
Utilize possibility on the industry
According to the present invention, by quantitative ground suitably control import to residual stress compressive residual stress especially in the one-way electromagnetic steel plate, compared with the past, can stably obtain the one-way electromagnetic steel plate of excellent in iron loss characteristic. By one-way electromagnetic steel plate of the present invention is used as iron core, can make high efficiency and small-sized transformer, therefore the value on the industry of the present invention is very high.
Among the present invention the expression number range " more than " and " following " include given figure.
Claims (1)
1. the manufacture method of a low iron loss one-way electromagnetic steel plate, it is characterized in that, with the direction of rolling direction approximate vertical on, and the periodic compartment of terrain irradiation continuous-wave laser beam of 2mm～8mm is set on rolling direction, give linear strain with the rolling direction approximate vertical, make and near the place strain introduction part of described low iron loss one-way electromagnetic steel plate, produce, in the bivariate distribution perpendicular to the compressive residual stress of the rolling direction on the horizontal cross section of plate, the value that in the zone of the compressive residual stress that has rolling direction the compressive residual stress integration of this rolling direction is obtained is 0.20N～0.80N.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006287709A JP5613972B2 (en) | 2006-10-23 | 2006-10-23 | Unidirectional electrical steel sheet with excellent iron loss characteristics |
| JP287709/2006 | 2006-10-23 | ||
| PCT/JP2007/070507 WO2008050700A1 (en) | 2006-10-23 | 2007-10-16 | Unidirectional magnetic steel sheet excellent in iron loss characteristic |
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| Publication Number | Publication Date |
|---|---|
| CN101528951A CN101528951A (en) | 2009-09-09 |
| CN101528951B true CN101528951B (en) | 2010-12-29 |
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| CN2007800391681A Active CN101528951B (en) | 2006-10-23 | 2007-10-16 | Unidirectional magnetic steel sheet excellent in iron loss characteristic |
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| US (1) | US20090272464A1 (en) |
| EP (1) | EP2083091B1 (en) |
| JP (1) | JP5613972B2 (en) |
| KR (1) | KR20090064419A (en) |
| CN (1) | CN101528951B (en) |
| BR (1) | BRPI0717360B1 (en) |
| PL (1) | PL2083091T3 (en) |
| RU (1) | RU2400542C1 (en) |
| TW (1) | TW200831676A (en) |
| WO (1) | WO2008050700A1 (en) |
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| JP5923882B2 (en) * | 2010-06-30 | 2016-05-25 | Ｊｆｅスチール株式会社 | Oriented electrical steel sheet and manufacturing method thereof |
| CN102477484B (en) * | 2010-11-26 | 2013-09-25 | 宝山钢铁股份有限公司 | Quick laser scribing method |
| JP5429213B2 (en) * | 2011-02-23 | 2014-02-26 | 新日鐵住金株式会社 | Method for producing unidirectional electrical steel sheet with excellent iron loss characteristics |
| CN103596720B (en) * | 2011-06-01 | 2016-03-23 | 新日铁住金株式会社 | The manufacturing installation of grain-oriented magnetic steel sheet and the manufacture method of grain-oriented magnetic steel sheet |
| US10745773B2 (en) * | 2011-12-27 | 2020-08-18 | Jfe Steel Corporation | Device to improve iron loss properties of grain-oriented electrical steel sheet |
| JP5884165B2 (en) | 2011-12-28 | 2016-03-15 | Ｊｆｅスチール株式会社 | Oriented electrical steel sheet and manufacturing method thereof |
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| CN1761764A (en) * | 2003-03-19 | 2006-04-19 | 新日本制铁株式会社 | Grain-oriented magnetic steel sheet excellent in magnetic characteristic and its manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5518566A (en) * | 1978-07-26 | 1980-02-08 | Nippon Steel Corp | Improving method for iron loss characteristic of directional electrical steel sheet |
| JPH0619112B2 (en) | 1986-09-26 | 1994-03-16 | 新日本製鐵株式会社 | Method for improving iron loss value of electrical steel sheet |
| JP4344264B2 (en) | 2004-03-08 | 2009-10-14 | 新日本製鐵株式会社 | Low iron loss unidirectional electrical steel sheet |
| JP4272588B2 (en) * | 2004-05-26 | 2009-06-03 | 新日本製鐵株式会社 | Method for producing grain-oriented electrical steel sheet |
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Also Published As
| Publication number | Publication date |
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| BRPI0717360A2 (en) | 2011-11-08 |
| EP2083091A1 (en) | 2009-07-29 |
| WO2008050700A1 (en) | 2008-05-02 |
| JP5613972B2 (en) | 2014-10-29 |
| TWI372786B (en) | 2012-09-21 |
| TW200831676A (en) | 2008-08-01 |
| EP2083091A4 (en) | 2012-07-25 |
| JP2008106288A (en) | 2008-05-08 |
| PL2083091T3 (en) | 2021-06-14 |
| EP2083091B1 (en) | 2020-12-02 |
| BRPI0717360B1 (en) | 2014-11-04 |
| US20090272464A1 (en) | 2009-11-05 |
| RU2400542C1 (en) | 2010-09-27 |
| KR20090064419A (en) | 2009-06-18 |
| CN101528951A (en) | 2009-09-09 |
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