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公开(公告)号：US20240033804A1
公开(公告)日：2024-02-01
申请号：US18484254
申请日：2023-10-10
CPC分类号： B21D28/34 , B23D15/04 , B23D35/005 , B26D1/01 , B26D7/06 , B26D7/2628 , B26D2001/0066
摘要： A shearing method of a plate-shaped workpiece for applying a shear force in a thickness direction of the plate-shaped workpiece includes: a step for starting applying the shear force on the workpiece with a clearance between action points in a surface direction orthogonal to the thickness direction of the workpiece; a step for applying the shear force after the start of applying the shear force until a fractured surface is created in the workpiece; and a step for increasing the clearance depending on a deformation of the workpiece in the thickness direction after starting applying the shear force until the fractured surface is created in the workpiece.
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公开(公告)号：US20230140766A1
公开(公告)日：2023-05-04
申请号：US17908553
申请日：2021-04-21
发明人： Eisaku SAKURADA , Takashi YASUTOMI , Genki ABUKAWA
IPC分类号： C21D8/02 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C23C2/40 , B21C47/02
摘要： This hot-rolled steel sheet has a predetermined chemical composition and predetermined metallographic structure, a ratio between a maximum depth of a region where, on one surface, a rotation angle between a normal line of the one surface and a (011) pole near the normal line of the one surface is 5° or less and a maximum depth of a region where, on the other surface, a rotation angle between a normal line of the other surface and a (011) pole near the normal line of the other surface is 5° or less is 1.00 to 1.20, and a tensile strength is 1150 MPa or more.
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公开(公告)号：US20240068066A1
公开(公告)日：2024-02-29
申请号：US18280105
申请日：2022-02-22
发明人： Yasuaki TANAKA , Shohei YABU , Hiroshi SHUTO , Koutarou HAYASHI , Takashi YASUTOMI , Eisaku SAKURADA
CPC分类号： C21D9/46 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/14 , C22C38/60
摘要： There is provided a steel sheet having a chemical composition comprising, in mass %, C: 0.05 to 0.25%, Si: 0.2 to 2.0%, Mn: 1.2 to 3.0%, P: 0.030% or less, S: 0.050% or less, Al: 0.01 to 0.55%, N: 0.0100% or less, and Ti: 0.010 to 0.250%, with the balance: Fe and impurities, wherein a random intensity ratio of a texture in a near-surface portion of the steel sheet is 8.0 or less, and a minimum angle formed between a maximum strength orientation in a {110} pole figure of the texture and a normal direction of a rolled surface of the steel sheet is 10° or less.
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公开(公告)号：US20230250521A1
公开(公告)日：2023-08-10
申请号：US18008639
申请日：2021-08-06
IPC分类号： C22C38/02 , C22C38/04 , C22C38/06 , C22C38/60 , C22C38/00 , C22C38/22 , C22C38/32 , C22C38/46 , C22C38/48 , C22C38/42 , B32B15/01
CPC分类号： C22C38/02 , C22C38/04 , C22C38/06 , C22C38/60 , C22C38/001 , C22C38/22 , C22C38/32 , C22C38/46 , C22C38/48 , C22C38/42 , B32B15/011 , B32B2311/30 , B32B2307/536 , B32B2307/54
摘要： Provided is a steel sheet comprising a sheet thickness center part and a first surface layer part and a second surface layer part respectively arranged at two sides of the sheet thickness center part, wherein the first surface layer part and second surface layer part respectively independently have thicknesses of more than 10 μm to 30% or less of the sheet thickness, the first surface layer part and second surface layer part have average Vickers hardnesses different from the average Vickers hardness of a sheet thickness ½ position, and a first hardness cumulative value at a region from a surface of the first surface layer part side to 30% of the sheet thickness is 1.05 times or more of a second hardness cumulative value at a region from a surface of the second surface layer part side to 30% of the sheet thickness.
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公开(公告)号：US20230097055A1
公开(公告)日：2023-03-30
申请号：US17794672
申请日：2021-04-21
发明人： Eisaku SAKURADA , Takashi YASUTOMI , Genki ABUKAWA
IPC分类号： C21D9/46 , C22C38/38 , C22C38/34 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/06 , C21D8/02
摘要： Adopted are a hot-rolled steel sheet having a predetermined chemical composition, in which a region, where a rotation angle between a normal line of a surface and a (011) pole near the normal line becomes 5° or less, is 0.150 or less from the surface in terms of a sheet thickness direction position standardized by a sheet thickness, and a region, where the rotation angle becomes 20° or more, is 0.250 or more from the surface in terms of the sheet thickness direction position standardized by the sheet thickness and a manufacturing method thereof.
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公开(公告)号：US20220250177A1
公开(公告)日：2022-08-11
申请号：US17438056
申请日：2020-01-09
摘要： There is provided a cutting method for cutting a workpiece using a cutting tool comprising a die and a punch, including: arranging the workpiece between the die and the punch, and in a state in which a wedge-shaped first cutting part of the die and a wedge-shaped second cutting part of the punch are opposed, pushing the punch relatively to the die side to cut the workpiece; wherein: a front end angle θ1 of the first cutting part and a front end angle θ2 of the second cutting part are each 100 or more and 1200 or less, and a front end radius R1 of the first cutting part and a front end radius R2 of the second cutting part are each 0.5% or more and 35.0% or less of a sheet thickness.
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公开(公告)号：US20230416859A1
公开(公告)日：2023-12-28
申请号：US18031104
申请日：2021-11-18
IPC分类号： C21D9/46 , C22C38/38 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D8/02 , C21D6/00 , C21D1/18
CPC分类号： C21D9/46 , C21D2211/001 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/002 , C22C38/001 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D6/002 , C21D6/005 , C21D6/008 , C21D1/18 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C21D2211/009 , C22C38/38
摘要： This steel sheet has a predetermined chemical composition, has a microstructure in which a number density of alloy carbides present at grain boundaries and having a major axis of 10 to 100 nm is 1.0×108 to 1.0×1011/cm2 and a number density of alloy carbides present in grains and having a major axis of 10 nm or less is 1.0×1016 to 1.0×1019/cm3, and has a tensile strength of 1,030 MPa or more.
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公开(公告)号：US20230407430A1
公开(公告)日：2023-12-21
申请号：US18036996
申请日：2021-11-19
发明人： Takashi YASUTOMI , Eisaku SAKURADA
IPC分类号： C21D9/46 , C22C38/38 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D8/02 , C21D6/00 , C21D1/18
CPC分类号： C21D9/46 , C22C38/38 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/002 , C22C38/001 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D6/002 , C21D6/005 , C21D6/008 , C21D1/18 , C21D8/021 , C21D8/0278 , C21D2211/002 , C21D2211/008
摘要： This steel sheet has predetermined chemical composition and microstructure, in a crystal orientation distribution function of a texture at a sheet thickness ¼ position, when A/B that is a ratio of a maximum value A of pole densities at Φ=20° to 60° and φ1=30° to 90° in a cross section of φ2=45° to a maximum value B of pole densities at Φ=120° to 60° and φ1=30° to 90° in the cross section of φ2=45° is 1.50 or less, a total of the maximum value A and the maximum value B is 6.00 or less, and a tensile strength is 1030 MPa or more.
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公开(公告)号：US20230257844A1
公开(公告)日：2023-08-17
申请号：US18012882
申请日：2021-08-06
IPC分类号： C21D9/46 , C21D8/02 , C21D6/00 , C22C38/60 , C22C38/14 , C22C38/12 , C22C38/16 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C22C38/10 , C22C38/08 , C22C38/18 , C21D3/04
CPC分类号： C21D9/46 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D6/005 , C21D6/008 , C22C38/60 , C22C38/14 , C22C38/12 , C22C38/16 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/008 , C22C38/002 , C22C38/10 , C22C38/08 , C22C38/18 , C22C38/001 , C22C38/005 , C21D3/04 , C21D8/0257
摘要： Provided is a steel sheet comprising a sheet thickness center part and a first surface layer softened part and a second surface layer softened part respectively arranged at two sides of the sheet thickness center part, wherein the first surface layer softened part and second surface layer softened part have 10 μm or more average thicknesses and have average Vickers hardnesses of 0.90 time or less of the average Vickers hardness of a sheet thickness ½ position, and the first surface layer softened part has an average Vickers hardness of 1.05 times or more the average Vickers hardness of the second surface layer softened part.
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公开(公告)号：US20220241838A1
公开(公告)日：2022-08-04
申请号：US17626321
申请日：2020-07-10
发明人： Jun NITTA , Takashi YASUTOMI , Ryo TABATA
摘要： The present invention has as its technical problem to provide a punching method able to stably secure a stretch-flangeability equal to or greater than the case of using a punch having a flat blade at its bottom surface. The punching method of the present invention is a method of punching a metal sheet using a punching and shearing device provided with a punch having an upper blade having a horizontal part with respect to the cutting line in part and having parts other than the horizontal part comprised of inclined parts and a die having a lower blade wherein the upper blade used for the punching process has a shape where the inclined parts first contact the metal sheet at the time of a punching process.
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