EP2803737A2 - Procédé de fabrication de pièce moulée par compression et feuille d'acier pour travail à la presse - Google Patents

Procédé de fabrication de pièce moulée par compression et feuille d'acier pour travail à la presse Download PDF

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Publication number
EP2803737A2
EP2803737A2 EP20140166981 EP14166981A EP2803737A2 EP 2803737 A2 EP2803737 A2 EP 2803737A2 EP 20140166981 EP20140166981 EP 20140166981 EP 14166981 A EP14166981 A EP 14166981A EP 2803737 A2 EP2803737 A2 EP 2803737A2
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EP
European Patent Office
Prior art keywords
steel sheet
silicon steel
siliconizing
manufacturing
pressed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20140166981
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German (de)
English (en)
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EP2803737A3 (fr
Inventor
Tsukuru Kinoshita
Koji Moritani
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Sumitomo Heavy Industries Ltd
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Sumitomo Heavy Industries Ltd
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Publication date
Application filed by Sumitomo Heavy Industries Ltd filed Critical Sumitomo Heavy Industries Ltd
Publication of EP2803737A2 publication Critical patent/EP2803737A2/fr
Publication of EP2803737A3 publication Critical patent/EP2803737A3/fr
Withdrawn legal-status Critical Current

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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
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • 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
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1255—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest with diffusion of elements, e.g. decarburising, nitriding
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/04—Diffusion into selected surface areas, e.g. using masks
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/06—Solid state diffusion of only metal elements or silicon into metallic material surfaces using gases
    • C23C10/08—Solid state diffusion of only metal elements or silicon into metallic material surfaces using gases only one element being diffused
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/60—After-treatment
    • 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
    • C21D2221/00—Treating localised areas of an article
    • 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
    • C21D2261/00—Machining or cutting being involved

Definitions

  • the present invention relates to a method of manufacturing a pressed part such as a motor core or a transformer core with a silicon steel sheet, and a steel sheet for press working used in the manufacturing of the pressed part.
  • a core such as a motor core or a transformer core requires a low core loss and a high magnetic flux density as characteristics thereof.
  • a silicon steel sheet having the Si content of 4.0% by weight or greater is widely used as a material that satisfies a low core loss.
  • There are a siliconizing treatment, direct casting and the like as a method of acquiring the silicon steel sheet (refer to Japanese Unexamined Patent Application Publication No. 2000-178699 ).
  • the silicon steel sheet has excellent low core loss characteristics, and the steel sheet becomes hardened to the extent that the Si content increases, and press formability sharply deteriorates. Since the steel sheet becomes hardened, a metallic mold such as a punch and a die used for press working is likely to wear or be damaged, and a frequency of maintenance of the metallic mold increases.
  • the present invention is made in light of the problems, and an object of the present invention is to provide a method of manufacturing a pressed part, which imparts excellent formability on a steel sheet, and a steel sheet for press working used in the manufacturing of the pressed part when the pressed part is manufactured with a silicon steel sheet.
  • An aspect of the present invention relates to a method of manufacturing a pressed part.
  • the method of manufacturing a pressed part includes a process of pressing a to-be-pressed portion of a silicon steel sheet as a workpiece in which the to-be-pressed portion is softer than other portions.
  • the silicon steel sheet in which the to-be-pressed portion is softer than the other portions is pressed, the steel sheet is excellent in formability during the press working.
  • a method of manufacturing a pressed part according to another aspect of the present invention includes a process of pressing a low-silicon steel sheet which becomes a material of a high-silicon steel sheet; and a process of siliconizing the low-silicon steel sheet to obtain the high-silicon steel sheet.
  • the low-silicon steel sheet which is softer and is better in formability than the high-silicon steel sheet, is pressed and then undergoes the siliconizing treatment, the steel sheet is excellent in formability during the press working.
  • Still another aspect of the present invention relates to a steel sheet for press working.
  • a to-be-pressed portion of a silicon steel sheet is softer than other portions thereof.
  • the steel sheet is excellent in formability during the press working.
  • the method of manufacturing a pressed part according to the aspect of the present invention imparts excellent formability on the steel sheet during the press working.
  • the steel sheet for press working according to the aspect of the present invention is excellent in formability during the press working.
  • a pressed part which can be obtained by a manufacturing method according to a first embodiment is made of a high-silicon steel sheet.
  • the high-silicon steel sheet contains Si of 4.0% by weight or greater.
  • Si is an element which is effective for improving core loss characteristics, and when the Si content is equal to or greater than 4.0% by weight, excellent low core loss characteristics are obtained.
  • the Si content is equal to or greater than 4.0% by weight, there is a problem in that the steel sheet becomes hardened to the extent that the Si content increases, and press formability deteriorates.
  • the high-silicon steel sheet can be obtained by a siliconizing treatment or direct casting.
  • An upper limit value of the Si content is not particularly limited.
  • the upper limit value exceeds 7.0% by weight, a saturation magnetic flux density remarkably decreases, and thus the upper limit value is preferably equal to or less than 7.0% by weight.
  • the lower limit value of the Si content is equal to or greater than 6.0% by weight, more excellent low core loss characteristics are obtained, and thus the lower limit value is preferably equal to or greater than 6.0% by weight.
  • the high-silicon steel sheet may contain components and ranges of components' content which can be obtained in a widely known steel manufacturing process.
  • the high-silicon steel sheet may contain alloy elements such as Al, Cr, Mo, W, V, Ti and Sb, each of which is contained so as not to degrade the core loss characteristics and the formability.
  • Fig. 1 illustrates a high-silicon steel sheet 18 as a workpiece 10 used for obtaining a pressed part according to the first embodiment. It is possible to obtain the pressed part by forming the workpiece 10 into a predetermined shape by means of press working such as punching. Hereinafter, a case where a stator core of a motor is obtained as the pressed part will be described.
  • Fig. 1 illustrates a portion 12 by a two-dot chain line, which becomes an exterior shape of the stator core seen from the top.
  • the high-silicon steel sheet 18 is obtained by siliconizing a low-silicon steel sheet whichbecomes a material of the high-silicon steel sheet 18.
  • the low-silicon steel sheet contains Si of less than 4.0% by weight.
  • components of the low-silicon steel sheet components other than Si and ranges of the other components' contents are not particularly limited.
  • the low-silicon steel sheet may contain components and ranges of components' content that can be obtained in a widely known steel manufacturing process.
  • the Si content is preferably equal to or less than 3.5% by weight.
  • the siliconizing treatment is performed using a chemical vapor deposition method (a CVD method).
  • the siliconizing treatment is performed by disposing a steel sheet in a non-oxidizing atmosphere that contains source gas such as SiCl 4 or SiH 4 which is a source of Si, by heating the steel sheet to a predetermined temperature, and by retaining the steel sheet at the heated temperature. Accordingly, Si penetrates into a surface layer of the steel sheet, and Si in the surface layer of the steel sheet diffuses in a steel-sheet thickness direction.
  • the heated temperature of the steel sheet is, for example, 1023°C to 1230°C.
  • Fig. 2 illustrates a state where the low-silicon steel sheet 14 undergoes the siliconizing treatment.
  • An example in Fig. 2 illustrates a state where the low-silicon steel sheet 14 is disposed on a stage 20 provided in a chamber, and the low-silicon steel sheet 14 undergoes the siliconizing treatment via a single surface in a steel-sheet thickness direction thereof.
  • a surface of a to-be-pressed portion 16 (hereinafter, referred to as a to-be-worked portion 16) of the low-silicon steel sheet 14 is coated with a mask 30, and the siliconizing treatment is performed on the low-silicon steel sheet 14.
  • the to-be-worked portion 16 indicates a portion which undergoes a plastic deformation during press working. If the press working is punching, the to-be-worked portion 16 is a portion which is sheared by a cutting edge of a punch and a cutting edge of a die.
  • the to-be-worked portion 16 is illustratively surrounded by a two-dot chain line to simplify a description.
  • a mechanical mask such as a metallic foil formed in a predetermined pattern is used as the mask 30.
  • the pattern is formed in such a manner that the surface of the to-be-worked portion 16 of the low-silicon steel sheet 14 is coated with the pattern, and that surfaces of other portions of the low-silicon steel sheet 14 are exposed.
  • a metallic material such as pure iron or silicon steel, or a ceramic material such a glass is used as a material of the mechanical mask so as to resist heating during the siliconizing treatment.
  • Si progressively penetrates into portions other than the to-be-worked portion 16, which are not coated with the mask 30, and Si is prevented frompenetrating into the to-be-workedportion 16 that is coated with the mask 30. That is, the to-be-worked portion 16 is not siliconized, and the portions other than the to-be-worked portion 16 are siliconized. Accordingly, it is possible to obtain the high-silicon steel sheet 18 in which the to-be-worked portion 16 has the Si content less than that of the other portions. The steel sheet becomes hardened to the extent that the Si content increases, and thus it is possible to obtain the high-silicon steel sheet 18 in which the to-be-worked portion 16 is softer than the other portions.
  • siliconizing treatment conditions are adjusted in such a manner that the Si content of the to-be-worked portion 16 becomes less than 4.0% by weight and the Si contents of the other portions become equal to or greater than 4.0% by weight. More preferably, the siliconizing treatment conditions are adjusted in such a manner that the Si content of the to-be-worked portion 16 becomes equal to or less than 3.5% by weight and the Si contents of the other portions become equal to or greater than 6.0% by weight.
  • the adjusted siliconizing treatment conditions are a concentration of the source gas in the non-oxidizing atmosphere in which the steel sheet is disposed, a heated temperature of the steel sheet, and a time period of retaining the heated steel sheet.
  • the to-be-worked portion 16 of the low-silicon steel sheet 14 is provided to extend along an in-plane direction of the low-silicon steel sheet 14.
  • a direction A is defined as a direction that is perpendicular to the direction in which the to-be-worked portion 16 extends, and is the in-plane direction of the low-silicon steel sheet 14
  • the low-silicon steel sheet 14 is preferably coated with the mask 30 in a range in the direction A greater than the to-be-worked portion 16.
  • the coating range of the mask 30 indicates a range in the direction A, within which the to-be-worked portion 16 is interposed, and the to-be-worked portion 16 is disposed at a substantially center position in the direction A.
  • Si when Si penetrates into the surface layer of the steel sheet to diffuse in the steel-sheet thickness direction, Si is prevented from diffusing to the to-be-worked portion 16, and thus it is possible to stablyperformpress working without requiring high accuracy of locating positions of the workpiece and the metallic mold during the press working.
  • the coating range of the mask 30 is set to be equal to or greater than 3.0 mm, Si is reliably prevented from diffusing to the to-be-worked portion 16.
  • the to-be-worked portion 16 is pressed so as to form the shape of the stator core. That is, the to-be-worked portion 16 is pressed so as to form the predetermined shape of the pressed part.
  • Fig. 3 illustrates a state where the to-be-worked portion 16 of the workpiece 10 is pressed.
  • the to-be-worked portion 16 of the workpiece 10 is disposed between a cutting edge 31a of a punch 31 and a cutting edge 33a of a die 33.
  • the punch 31 moves in a vertical direction, it is possible to obtain a press formed part with the shape of the stator core by shearing and punching the workpiece 10 along the to-be-worked portion 16 by the cutting edge 31a of the punch 31 and the cutting edge 33a of the die 33.
  • the steel sheet 18 in which the to-be-pressed portion 16 is softer than the other portions is pressed, the steel sheet is excellent in formability during the press working. Since the to-be-pressed portion 16 is softer than the other portions, the metallic mold such as the punch and the die used for the press working is unlikely to wear or be damaged, and a frequency of maintenance of the metallic mold decreases.
  • the high-silicon steel sheet 18 is obtained by siliconizing the low-silicon steel sheet 14 which is a material of the high-silicon steel sheet 18.
  • the siliconizing treatment is performed in a state where the surface of the low-silicon steel sheet 14 is not coated with a mask, and descriptions on other points are the same as those in the first embodiment.
  • the high-silicon steel sheet 18 which can obtained by the siliconizing treatment is coated with the mask 30 in such a manner that the surface of the to-be-worked portion 16 is exposed, and the high-silicon steel sheet 18 is etched.
  • a mechanical mask formed in a predetermined pattern is used as the mask 30. The pattern is formed in such a manner that the surface of the to-be-worked portion 16 of the high-silicon steel sheet 18 is exposed, and that surfaces of other portions of the high-silicon steel sheet 18 are coated with the mask 30.
  • the etching is performed by painting or spraying an etching solution such as FeCl 3 .
  • etching conditions are adjusted in such a manner that a concave portion 16a is formed in the to-be-worked portion 16 of the high-silicon steel sheet 18, and that the to-be-worked portion 16 is not penetrated.
  • the adjusted etching conditions are a time period of exposure to the etching solution, the type of the etching solution or the like.
  • the etching makes progress in the to-be-worked portion 16 that is not coated with the mask 30.
  • the etching is prevented in the portions other than the to-be-worked portion 16, which is coated with the mask 30. Accordingly, it is possible to obtain the high-silicon steel sheet 18 in which the to-be-worked portion 16 has a thickness thinner than that of the other portions. Since a portion becomes softened to the extent that a thickness of the portion is thin, it is possible to obtain the high-silicon steel sheet 18 in which the to-be-worked portion 16 is softer than the other portions. That is, according to the etching using the mask 30, the to-be-worked portion 16 of the high-silicon steel sheet 18 becomes softened.
  • the range of the etching of the high-silicon steel sheet 18 is preferably in the direction A wider than the to-be-worked portion 16 of the high-silicon steel sheet 18.
  • the etching range indicates a range in the direction A, within which the to-be-worked portion 16 is interposed, and the to-be-worked portion 16 is disposed at a substantially center position in the direction A. It is possible to stably perform press working without requiring high accuracy of locating positions of the workpiece and the metallic mold during the press working.
  • a thickness of the etched portion of the high-silicon steel sheet 18 is t x 1/4 or greater and t x 3/4 or less with respect to a thickness t of the other portions of the high-silicon steel sheet 18, it is possible to limit a time period of the etching and to obtain effects by which the to-be-worked portion 16 is sufficiently softened.
  • the to-be-worked portion 16 of the high-silicon steel sheet 18 as the workpiece 10 is pressed so as to form a shape of a pressed part.
  • the manufacturing method according to the second embodiment imparts excellent in formability on the steel sheet during the press working, and a frequency of maintenance of the metallic mold decreases. Since the concave portion 16a is formed in the to-be-pressed portion 16 of the high-silicon steel sheet 18 by the etching, it is possible to easily recognize the position of the to-be-pressed portion 16 by visual observation, and it becomes an easy task to locate the positions of the workpiece and the metallic mold during the press working.
  • the high-silicon steel sheet 18 is obtained by siliconizing the low-silicon steel sheet 14 which is a material of the high-silicon steel sheet 18.
  • the siliconizing treatment is performed in a state where the surface of the low-silicon steel sheet 14 is not coated with the mask 30, and descriptions on other points are the same as those in the first embodiment.
  • a steel product 40 for de-siliconizing is brought into contact with the surface of the to-be-worked portion 16, and a heat treatment is performed in such a manner that Si diffuses from the high-silicon steel sheet 18 to the steel product 40 for de-siliconizing.
  • the steel product 40 for de-siliconizing is a steel product that has the Si content less than that of the high-silicon steel sheet 18, and for example, is made of the low-silicon steel sheet 14 that contains the Si content of less than 4.0% by weight.
  • the steel product 40 for de-siliconizing is formed to coat the surface of the to-be-worked portion 16 of the high-silicon steel sheet 18 with the steel product 40 for de-siliconizing. That is, the steel product 40 for de-siliconizing is formed to be shaped along the to-be-worked portion 16 of the high-silicon steel sheet 18.
  • the heat treatment is performed by disposing the steel product 40 for de-siliconizing and the high-silicon steel sheet 18 in a non-oxidizing atmosphere, by heating the steel product 40 for de-siliconizing and the high-silicon steel sheet 18 to a predetermined temperature, and by retaining the steel product 40 for de-siliconizing and the high-silicon steel sheet 18 which are heated at the temperature.
  • the heated temperature is set to a temperature, for example, 1000°C to 1200°C, at which Si can diffuse from the high-silicon steel sheet 18 to the steel product 40 for de-siliconizing.
  • the heat treatment described above it is possible to obtain the high-silicon steel sheet 18 in which the to-be-worked portion 16 in contact with the steel product 40 for de-siliconizing has the Si content less than those of the other portions. That is, according to the heat treatment using the steel product 40 for de-siliconizing, the to-be-worked portion 16 of the high-silicon steel sheet 18 becomes softened.
  • heat treatment conditions or components and a size of the steel product 40 for de-siliconizing are adjusted in such a manner that the Si content of the to-be-worked portion 16 becomes less than 4.0% by weight and the Si contents of the other portions become equal to or greater than 4 . 0% by weight . More preferably, the heat treatment conditions and the like are adjusted in such a manner that the Si content of the to-be-worked portion 16 becomes equal to or less than 3.5% by weight and the Si contents of the other portions become equal to or greater than 6.0% by weight.
  • the adjusted heat treatment conditions are a heated temperature of the steel sheet, and a time period of retaining the heated steel sheet.
  • the adjusted components of the steel product 40 for de-siliconizing are the Si content of the steel product 40 for de-siliconizing and the like, and Si is likely to diffuse from the high-silicon steel sheet 18 to the steel product 40 for de-siliconizing to the extent that the Si content is small.
  • the adjusted sizes of the steel product 40 for de-siliconizing are a thickness of the steel product 40 for de-siliconizing and the like relative to the thickness of the high-silicon steel sheet 18.
  • the to-be-worked portion 16 of the high-silicon steel sheet 18 as the workpiece 10 is pressed so as to form a shape of a pressed part.
  • the manufacturing method according to the third embodiment imparts excellent formability on the steel sheet during the press working, and a frequency of maintenance of the metallic mold decreases.
  • the low-silicon steel sheet 14 which is a material of the high-silicon steel sheet 18, is pressed as the workpiece 10 into a predetermined shape of a pressed part 19.
  • the high-silicon steel sheet 18 is obtained by siliconizing the low-silicon steel sheet 14 which is formed in the shape of the pressed part as a material.
  • the siliconizing treatment is performed in a state where the surface of the low-silicon steel sheet 14 is not coated with a mask. In other points, the siliconizing treatment is the same as that described in the first embodiment.
  • the low-silicon steel sheet 14 which is softer and is better in formability than the high-silicon steel sheet 18, is pressed as the workpiece 10 and then undergoes the siliconizing treatment, and thus the steel sheet is excellent in formability during the press working. Since the low-silicon steel sheet 14 softer than the high-silicon steel sheet 18 is pressed, the metallic mold such the punch and the die used for the press working is unlikely to wear and be damaged, and a frequency of maintenance of the metallic mold decreases.
  • the stator core of the motor is exemplified as the pressed part manufactured by the manufacturing method according to the present invention.
  • the present invention is not limited to the embodiment, and the pressed part may be a core or other part of electrical equipment such as a generator or a transformer.
  • the siliconizing treatment method using the CVD method is described, but the siliconizing treatment is not limited to the CVD method.
  • the siliconizing treatment using another method may be performed by painting a coating composite which contains Si as a main component on the low-silicon steel sheet, and by annealing the low-silicon steel sheet in a non-oxidizing atmosphere.
  • the punching is exemplified as the press working, but the press working may be bending, drawing or the like in addition to the punching.
  • the mechanical mask is exemplified as the mask 30.
  • a part of the surface of the steel sheet can be preferably coated with the mask 30, and for example, the mask 30 may be photoresist or the like.
  • the photoresist is used as the mask 30, the steel sheet is coated with the photoresist, the pattern of which is formed by a photolithography method.
  • the siliconizing treatment is performed in a state where the surface of the low-silicon steel sheet 14 is not coated with the mask 30.
  • the surface of the low-silicon steel sheet 14 is coated with the mask 30, the siliconizing treatment is performed, and then the etching may be performed.
  • the high-silicon steel sheet 18 in which the to-be-worked portion 16 has the Si content less than that of the other portions, and the thickness thinner than that of the other portions.
  • the siliconizing treatment is performed, and then the etching is performed.
  • the siliconizing treatment may be performed while the etching is being performed. That is, if the steel sheet used as the workpiece 10 for press working is coated with the mask 30 in such a manner that the surface of the to-be-worked portion 16 is exposed, and the etching process is performed, the siliconizing treatment may be performed either before or after the etching process.
  • the method of siliconizing the low-silicon steel sheet 14 is exemplified as the method of obtaining the high-silicon steel sheet 18.
  • the method of obtaining the high-silicon steel sheet 18 is not limited to the siliconizing treatment, and widely known methods may be used.
  • there is direct casting in which the high-silicon steel sheet is obtained by cooling molten steel which contains the same components as those of the high-silicon steel sheet 18, and by forming the molten sheet into a sheet shape by a plurality of rolls or the like.
  • the to-be-worked portion 16 is not siliconized by using the mask 30 and the other portions are siliconized. However, means for preventing the to-be-worked portion 16 from being siliconized is not limited to the mask 30.
  • the to-be-worked portion 16 is softened by using the etching or the steel product 40 for de-siliconizing, but means for softening the to-be-worked portion 16 is not limited to the etching or the steel product 40 for de-siliconizing.
  • the manufacturing method according to the present invention may be realized by a batch process in which each process is sequentially performed on a steel sheet with predetermined unit dimensions, or may be realized by a continuous process in which each process is performed on a steel strip that is continuously transported.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Soft Magnetic Materials (AREA)
  • Punching Or Piercing (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
EP14166981.2A 2013-05-16 2014-05-05 Procédé de fabrication de pièce moulée par compression et feuille d'acier pour travail à la presse Withdrawn EP2803737A3 (fr)

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JP2013103763A JP2014223641A (ja) 2013-05-16 2013-05-16 プレス加工品の製造方法及びプレス加工用鋼板

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108581057A (zh) * 2018-05-04 2018-09-28 山东大学 一种用于难加工材料高效切削的表层合金化弱化处理辅助加工方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109647956B (zh) * 2019-01-10 2020-11-20 宁波富技精工汽车零部件有限公司 精密高速动力电机铁芯硅钢片冲压工艺

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000178699A (ja) 1998-12-09 2000-06-27 Nkk Corp 磁束密度が高く加工性に優れた高珪素鋼板
WO2004044251A1 (fr) 2002-11-11 2004-05-27 Posco Composition de revetement et procede de fabrication de tole magnetique en acier a haute teneur en silicium utilisant cette composition

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62227078A (ja) * 1986-03-28 1987-10-06 Nippon Kokan Kk <Nkk> 連続ラインにおける高珪素鋼帯の製造方法
JP3045009B2 (ja) * 1994-06-23 2000-05-22 日本鋼管株式会社 珪素鋼帯
JP2001107218A (ja) * 1999-09-30 2001-04-17 Nkk Corp 気体浸珪処理法による高珪素鋼帯の製造方法
CN102510141B (zh) * 2011-10-31 2014-01-29 安泰科技股份有限公司 轴向磁通电机用非晶、微晶或纳米晶合金定子铁心及其制造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000178699A (ja) 1998-12-09 2000-06-27 Nkk Corp 磁束密度が高く加工性に優れた高珪素鋼板
WO2004044251A1 (fr) 2002-11-11 2004-05-27 Posco Composition de revetement et procede de fabrication de tole magnetique en acier a haute teneur en silicium utilisant cette composition

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108581057A (zh) * 2018-05-04 2018-09-28 山东大学 一种用于难加工材料高效切削的表层合金化弱化处理辅助加工方法
CN108581057B (zh) * 2018-05-04 2020-02-11 山东大学 一种用于难加工材料高效切削的表层合金化弱化处理辅助加工方法

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CN104164645B (zh) 2017-04-12
CN104164645A (zh) 2014-11-26
EP2803737A3 (fr) 2015-11-04

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