Abstract: A punch processing method for electrical steel sheets to manufacture core segments includes: stacking a plurality of electrical steel sheets; and punching out the plurality of electrical steel sheets in a stacked state simultaneously to manufacture the core segments, wherein in a case where the core segments are applied to a stator core in which a maximum magnetic flux density at a tooth portion is to be higher than a maximum magnetic flux density at a back yoke portion, degrees of Vickers hardness of an electrical steel sheet located second from a bottom side and above in the stacked state are set to 180 HV or higher, and 10 HV or higher than a value of degree of Vickers hardness of an electrical steel sheet located on the bottom side in the stacked state.

Abstract: A motor comprising a steel sheet used as a core material of the motor, wherein the steel sheet includes a composition including: by mass %, 0.010% or less of C; 2.0% to 7.0% of Si; 2.0% or less of Al; 0.05% to 1.0% of Mn; 0.005% or less of S; 0.005% or less of N; and balance Fe and inevitable impurities; the steel sheet includes a magnetic flux density changing area where a change ?B in magnetic flux density to a change ?H=50 A/m in a magnetic field, is equal to or higher than 0.50 T; a thickness of the steel sheet is 0.05 mm to 0.20 mm; and an eddy-current loss of the steel sheet, at 1000 Hz?1.0 T, is equal to or less than 0.55 of a total iron loss.

Abstract: A material for laminated iron cores is used as plural steel sheets to be overlapped with one another and punched when a laminated iron core is manufactured. A surface roughness of the steel sheets forming the material for laminated iron cores is at an arithmetic mean roughness Ra of 0.40 [?m] or less, and a sheet thickness deviation in a sheet width direction of at least a portion used as the laminated iron core is 3 [?m] or less per 500 [mm], the portion being of the steel sheets forming the material for laminated iron cores.

Abstract: A punching method includes: punching out a plurality of electrical steel sheets in a stacked state by a mold, wherein sheet thicknesses of the electrical steel sheets are set to be 0.35 mm or less, a Vickers hardness (test force 1 kg) of the sheets is set to be 150 to 400, and an average crystal grain size of the sheets is set to be 50 to 250 ?m, a clearance of the mold is set to be 7% or more of a minimum sheet thickness of the sheet thicknesses of the electrical steel sheets and equal to or lower than 7% of a total sheet thickness of the electrical steel sheets, and a pressure that a sheet presser of the mold applies to the electrical steel sheets is set to be 0.10 MPa or more.

Abstract: A Laminated core manufacturing device includes: an overlapping unit configured to overlap the plurality of laminated core materials conveyed along different conveyance routes; an edge aligning unit configured to align edge positions in a width direction of the plurality of laminated core materials between the plurality of laminated core materials; an uplift prevention unit configured to prevent uplift of the plurality of laminated core materials; an edge position correction unit configured to correct the edge positions in the width direction of the plurality of laminated core materials; and a punching unit configured to punch out the plurality of laminated core materials which are overlapped by the overlapping unit and have been subjected to an edge position alignment process performed by the edge aligning unit, an uplift prevention process performed by the uplift prevention unit, and an edge position correction process performed by the edge position correction unit.

Abstract: A laminated core manufacturing device includes: an overlapping unit configured to overlap the plurality of laminated core materials conveyed along different conveyance routes; an edge position correction unit configured to align edge positions in a width direction of the plurality of laminated core materials between the plurality of laminated core materials and to correct shift of each edge position of the plurality of laminated core materials with respect to a standard edge position; an uplift prevention unit configured to prevent uplift of the plurality of laminated core materials; and a punching unit configured to punch out the plurality of laminated core materials which are overlapped by the overlapping unit and have been subjected to a process to align the edge positions and to correct shift of the edge positions performed by the edge position correction unit, and a process to prevent the uplift performed by the uplift prevention unit.

Abstract: A punch processing method for a laminated iron core includes sequentially feeding the steel sheets to a mold; and performing a plurality of processes in the mold, the plurality of processes includes fixing the steel sheets being stacked to each other at a first fixing part that is positioned outside a closed curved line corresponding to an outermost periphery of the laminated iron core and a second fixing part that is positioned in a portion that finally serves as the laminated iron core; and performing punch processing on the outermost periphery of the laminated iron core while the steel sheets are stacked.

Abstract: Further lower iron loss can be achieved in a grain-oriented electrical steel sheet including: a predetermined film mainly composed of forsterite on a front and back surfaces thereof; and a plurality of grooves on the front surface thereof, in which the plurality of grooves have an average depth of 6% or more of a thickness of the steel sheet and are spaced a distance of 1 mm to 15 mm from respective adjacent grooves, the steel sheet has a specific magnetic permeability ?r15/50 of 35000 or more when subjected to alternating current magnetization at a frequency of 50 Hz and a maximum magnetic flux density of 1.5 T, and the steel sheet includes isolated parts having a presence frequency of 0.3/?m or less, the isolated parts being separated from a continuous part of the film in an interface between the steel sheet and the film in a cross section orthogonal to the rolling direction of the steel sheet.

Abstract: A method of manufacturing a grain oriented electrical steel sheet includes subjecting a steel slab to a rolling process including cold rolling to obtain a steel sheet with a final sheet thickness, the steel slab containing by mass % C: 0.01% to 0.20%, Si: 2.0% to 5.0%, Mn: 0.03% to 0.20%, sol. Al: 0.010% to 0.05%, N: 0.0010% to 0.020%, at least one element selected from S and Se in a total of 0.005% to 0.040%, and the balance including Fe and incidental impurities; forming, by a chemical process, a linear groove extending in a direction forming an angle of 45° or less with a direction orthogonal to a rolling direction of the steel sheet; subjecting the steel sheet to decarburization annealing; applying an annealing separator thereon mainly composed of MgO; and subjecting the steel sheet to final annealing to manufacture a grain oriented electrical steel sheet.

Abstract: Provided is a grain-oriented electrical steel sheet having better transformer iron loss property than conventional grain-oriented electrical steel sheets. A grain-oriented electrical steel sheet comprises: a steel substrate; a forsterite film on a surface of the steel substrate; and a Cr-depleted layer at a boundary between the steel substrate and the forsterite film, the Cr-depleted layer having a Cr concentration that is 0.70 times to 0.90 times a Cr concentration of the steel substrate.

Abstract: To predict the iron loss of a non-oriented electrical steel sheet after shearing, a non-oriented electrical steel sheet is sheared to a certain width, and iron loss Wt(B0) of the non-oriented electrical steel sheet after shearing is estimated according to a predetermined relational expression based on iron loss Wn(B1) in a non-machining-affected zone in which no machining strain is introduced by the shearing and iron loss Wi(B2) in a machining affected zone in which machining strain is introduced.

Abstract: A punch processing method for electrical steel sheets to manufacture core segments includes: stacking a plurality of electrical steel sheets; and punching out the plurality of electrical steel sheets in a stacked state simultaneously to manufacture the core segments, wherein in a case where the core segments are applied to a stator core in which a maximum magnetic flux density at a tooth portion is to be higher than a maximum magnetic flux density at a back yoke portion, degrees of Vickers hardness of an electrical steel sheet located second from a bottom side and above in the stacked state are set to 180 HV or higher, and 10 HV or higher than a value of degree of Vickers hardness of an electrical steel sheet located on the bottom side in the stacked state.

Abstract: A non-oriented electrical steel sheet has low iron loss even under inverter excitation and can be suitably used as the iron core of a motor. The non-oriented electrical steel sheet has a specific chemical composition and an average grain size r of 40 ?m to 120 ?m. An area ratio R of a total area of grains having a grain size of ? or less of the thickness of the steel sheet to a cross-sectional area of the steel sheet is 2% or greater, and the average grain size r (?m) and the area ratio R (%) satisfy a condition represented by Expression (1), R>?2.4×r+200 (1).

Abstract: A method of manufacturing a laminated iron core includes: inserting a plurality of electrical steel strips in a superposed state to feed rolls including a pair of upper and lower feed rolls that are driven by a drive device to feed the electrical steel strips in a superposed state into a die having a plurality of punching processes in sequence; joining a part or all of the superposed electrical steel strips together before entering the die or at an upstream stage portion of the die after feeding out the electrical steel strips from the pair of upper and lower feed rolls; and punching simultaneously the plurality of electrical steel strips in a superposed state in the die.

Abstract: A laminated core manufacturing device includes: an overlapping unit configured to overlap the plurality of laminated core materials conveyed along different conveyance routes; an edge position correction unit configured to align edge positions in a width direction of the plurality of laminated core materials between the plurality of laminated core materials and to correct shift of each edge position of the plurality of laminated core materials with respect to a standard edge position; an uplift prevention unit configured to prevent uplift of the plurality of laminated core materials; and a punching unit configured to punch out the plurality of laminated core materials which are overlapped by the overlapping unit and have been subjected to a process to align the edge positions and to correct shift of the edge positions performed by the edge position correction unit, and a process to prevent the uplift performed by the uplift prevention unit.

Abstract: A Laminated core manufacturing device includes: an overlapping unit configured to overlap the plurality of laminated core materials conveyed along different conveyance routes; an edge aligning unit configured to align edge positions in a width direction of the plurality of laminated core materials between the plurality of laminated core materials; an uplift prevention unit configured to prevent uplift of the plurality of laminated core materials; an edge position correction unit configured to correct the edge positions in the width direction of the plurality of laminated core materials; and a punching unit configured to punch out the plurality of laminated core materials which are overlapped by the overlapping unit and have been subjected to an edge position alignment process performed by the edge aligning unit, an uplift prevention process performed by the uplift prevention unit, and an edge position correction process performed by the edge position correction unit.

Abstract: A grain-oriented electrical steel sheet having a composition containing, in mass %, C: 0.005% or less, Si: 2.0% to 4.5%, and Mn: 0.5% or less, and also containing Sb and P in respective ranges satisfying 0.01%?[% Sb]?0.20% and 0.02%?[% P]?2.0×[% Sb], with a balance being Fe and incidental impurities, wherein when the steel sheet is excited to 1.0 T at 50 Hz in a rolling transverse direction, a magnetizing force (TD-H10) and an iron loss (TD-W10) are respectively (TD-H10)?200 A/m and (TD-W10)?1.60 W/kg. Thus, a grain-oriented electrical steel sheet having excellent transformer core loss can be obtained industrially stably at low cost.

Abstract: A punching method includes: punching out a plurality of electrical steel sheets in a stacked state by a mold, wherein sheet thicknesses of the electrical steel sheets are set to be 0.35 mm or less, a Vickers hardness (test force 1 kg) of the sheets is set to be 150 to 400, and an average crystal grain size of the sheets is set to be 50 to 250 ?m, a clearance of the mold is set to be 7% or more of a minimum sheet thickness of the sheet thicknesses of the electrical steel sheets and equal to or lower than 7% of a total sheet thickness of the electrical steel sheets, and a pressure that a sheet presser of the mold applies to the electrical steel sheets is set to be 0.10 MPa or more.

Abstract: A punch processing method for a laminated iron core includes sequentially feeding the steel sheets to a mold; and performing a plurality of processes in the mold, the plurality of processes includes fixing the steel sheets being stacked to each other at a first fixing part that is positioned outside a closed curved line corresponding to an outermost periphery of the laminated iron core and a second fixing part that is positioned in a portion that finally serves as the laminated iron core; and performing punch processing on the outermost periphery of the laminated iron core while the steel sheets are stacked.

Abstract: A material for laminated iron cores is used as plural steel sheets to be overlapped with one another and punched when a laminated iron core is manufactured. A surface roughness of the steel sheets forming the material for laminated iron cores is at an arithmetic mean roughness Ra of 0.40 [?m] or less, and a sheet thickness deviation in a sheet width direction of at least a portion used as the laminated iron core is 3 [?m] or less per 500 [mm], the portion being of the steel sheets forming the material for laminated iron cores.