公开(公告)号：US20240189881A1

公开(公告)日：2024-06-13

申请号：US18286881

申请日：2021-12-15

Applicant: JFE Steel Corporation

Inventor： Daiki Hioka ,  Yukihiro Matsubara ,  Noriki Fujita ,  Masaki Hino ,  Tetsuya Arakawa ,  Miwa Ohashi

IPC: B21B1/22

CPC classification number: B21B1/22 ,  B21B2001/221

Abstract: A manufacturing method of a cold-rolled steel sheet in which the method uses a transverse-type full-width heating device that heats a steel sheet over an entire area in a width direction of the steel sheet, and a cold rolling mill that rolls the steel sheet and that is arranged on a downstream side in a rolling direction with respect to the transverse-type full-width heating device, the method includes: heating the steel sheet by using the transverse-type full-width heating device in such a manner that temperatures of end portions in the width direction becomes higher than a temperature of a central portion in the width direction of the steel sheet on an entry side of the cold rolling mill.

公开(公告)号：US11772142B2

公开(公告)日：2023-10-03

申请号：US17629190

申请日：2020-02-10

Applicant: JFE Steel Corporation

Inventor： Noriki Fujita ,  Yukihiro Matsubara ,  Yu Nagai ,  Yoshimitsu Harada

IPC: B21B27/10 ,  B21B45/02 ,  B21B1/28

CPC classification number: B21B45/0257 ,  B21B1/28 ,  B21B27/10

Abstract: A rolling oil supply system is configured to supply rolling oil to a rolling stand selected from a plurality of rolling stands included in a tandem rolling mill, a first rolling oil supply system configured to circulate and supply rolling oil after removing wear powder generated by rolling, and a second rolling oil supply system configured to supply rolling oil containing the wear powder generated by rolling are provided. Mixed rolling oil in which the rolling oil supplied from the first rolling oil supply system and the rolling oil supplied from the second rolling oil supply system are mixed is supplied to selected fourth and fifth rolling stands.

公开(公告)号：US20240316697A1

公开(公告)日：2024-09-26

申请号：US18275070

申请日：2021-10-26

Applicant: JFE Steel Corporation

Inventor： Noriki Fujita ,  Yukihiro Matsubara ,  Takayuki Fukunaga

IPC: B23K26/38 ,  B21B1/22 ,  B21B15/00

CPC classification number: B23K26/38 ,  B21B1/22 ,  B21B15/0007 ,  B21B2001/221

Abstract: A laser cutting method for a steel strip, includes cutting an end in a width direction of the steel strip including a joint obtained by joining a rear end of a preceding steel strip and a front end of a following steel strip by using a laser beam, wherein the steel strip is cut such that an interval between pieces of dross having an aspect ratio of 1.0 or more is set to 1.0 mm or more and an interval between dross having an aspect ratio of 1.0 or more and dross having an aspect ratio of less than 1.0 is set to 1.0 mm or more in the end in the width direction after cutting.

公开(公告)号：US20240123542A1

公开(公告)日：2024-04-18

申请号：US18276488

申请日：2021-10-26

Applicant: JFE Steel Corporation

Inventor： Noriki Fujita ,  Yukihiro Matsubara ,  Takayuki Fukunaga

IPC: B23K26/0622 ,  B21B15/00 ,  B23K26/14 ,  B23K26/38 ,  B23K26/40

CPC classification number: B23K26/0622 ,  B21B15/00 ,  B23K26/14 ,  B23K26/38 ,  B23K26/40 ,  B23K2103/04

Abstract: A laser cutting method for a steel strip, includes cutting a vicinity of a joint obtained by joining a rear end of a preceding steel strip and a front end of a following steel strip by using a pulse-type laser beam, wherein output of the pulse-type laser beam is set to 0.5 kw or more per 1 ms, a processing point diameter of the pulse-type laser beam is set to 0.1 mm or more and less than 0.6 mm, and a ratio between a pulse period time and a down-time is set to 0.3 or more and less than 0.8.

公开(公告)号：US20240282491A1

公开(公告)日：2024-08-22

申请号：US18565274

申请日：2022-05-27

Applicant: JFE Steel Corporation

Inventor： Masanori Takenaka ,  Takeshi Imamura ,  Mari Takahashi ,  Noriki Fujita

IPC: H01F1/147 ,  C21D1/74 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/32 ,  C22C38/34 ,  C22C38/42 ,  C22C38/44 ,  C22C38/50 ,  C22C38/60

CPC classification number: H01F1/14775 ,  C21D1/74 ,  C21D6/001 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1283 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/32 ,  C22C38/34 ,  C22C38/42 ,  C22C38/44 ,  C22C38/50 ,  C22C38/60 ,  C21D2201/05 ,  C22C2202/02

Abstract: A method for producing a grain-oriented electrical steel sheet includes: heating a steel slab containing a specific composition; subsequently performing hot rolling; performing hot-band annealing as necessary; performing cold rolling either once or two or more times with intermediate annealing between each rolling to obtain a cold-rolled sheet having a final sheet thickness; performing primary recrystallization annealing which also serves as decarburization annealing; and performing finishing annealing. In the method for producing a grain-oriented electrical steel sheet, the heating temperature for the slab is 1300° C. or higher. In the rough rolling of the hot rolling, one of rolling passes is performed in the temperature range of 1200° C. or higher, and subsequently, a next rolling pass is performed in an opposite direction after a time interval of 5 seconds or longer, with a total rolling reduction of the rough rolling achieved 75% or higher.

公开(公告)号：US20240091833A1

公开(公告)日：2024-03-21

申请号：US18275064

申请日：2021-10-29

Applicant: JFE Steel Corporation

Inventor： Noriki Fujita ,  Takuya Kitamura ,  Tetsuya Arakawa ,  Yoshiki Ikoma ,  Miwa Ohashi

IPC: B21B37/00

CPC classification number: B21B37/007

Abstract: A cold rolling mill rolling condition calculation method includes: an estimation step of estimating a rolling constraint condition with respect to a target steady rolling condition of a roll target material, by inputting second multi-dimensional data to a prediction model, the prediction model having been trained with explanatory variable and response variable, the explanatory variable being first multi-dimensional data generated based on non-steady rolling performance data, among past rolling performance in rolling a roll material by a cold rolling mill, and the response variable being steady rolling performance data and rolling constraint condition data during steady rolling, and the second multi-dimensional data having been generated based on non-steady rolling performance data of the roll target material; and a change step of changing the target steady rolling condition so that the estimated rolling constraint condition satisfies a predetermined condition.

公开(公告)号：US12083568B2

公开(公告)日：2024-09-10

申请号：US17423476

申请日：2019-02-19

Applicant: JFE STEEL CORPORATION

Inventor： Noriki Fujita ,  Yukio Takashima

IPC: B21B3/02 ,  G05B19/4097

CPC classification number: B21B3/02 ,  G05B19/4097

Abstract: A production specification determination method, a production method, and a production specification determination apparatus that can increase robustness against disturbances during production of a metal material are provided. Included are the steps of acquiring at least one piece of performance data established after a predetermined process during production of a metal material, performing back analysis based on the at least one piece of performance data and a prediction model that relates production specifications and material characteristics, and searching for production specifications for after the predetermined process such that an estimated value for the material characteristics asymptotically approaches a desired value.

公开(公告)号：US20240165683A1

公开(公告)日：2024-05-23

申请号：US18283550

申请日：2021-12-15

Applicant: JFE Steel Corporation

Inventor： Daiki Hioka ,  Yukihiro Matsubara ,  Noriki Fujita ,  Masaki Hino ,  Tetsuya Arakawa ,  Miwa Ohashi

IPC: B21B1/28 ,  B21B38/00 ,  B21B1/22

CPC classification number: B21B1/28 ,  B21B38/006 ,  B21B2001/221

Abstract: A manufacturing method of a cold-rolled steel sheet in which the method uses a full-width heating device that heats a steel sheet over an entire area in a width direction of the steel sheet, an edge heating device that heats end portions in the width direction of the steel sheet, and a cold rolling mill that rolls the steel sheet and that is arranged on a downstream side in a rolling direction with respect to the full-width heating device and the edge heating device, the method includes: heating the steel sheet by using the full-width heating device and the edge heating device in such a manner that temperatures of the end portions in the width direction becomes higher than a temperature of a central portion in the width direction of the steel sheet on an entry side of the cold rolling mill.

公开(公告)号：US20240033797A1

公开(公告)日：2024-02-01

申请号：US18276095

申请日：2021-10-29

Applicant: JFE Steel Corporation

Inventor： Noriki Fujita ,  Takuya Kitamura ,  Tetsuya Arakawa

IPC: B21B37/00

CPC classification number: B21B37/007

Abstract: A method of detecting chattering in a cold rolling mill, the method includes: a step of predicting occurrence of chattering during rolling of a material to be rolled, by inputting second multidimensional data to a prediction model, the second multidimensional data having been generated based on condition data corresponding to array data related to the material to be rolled, and the prediction model having been trained with an explanatory variable and an objective variable, the explanatory variable being first multidimensional data generated based on one-dimensional array data representing a past rolling record of rolling of rolled materials by means of a cold rolling mill, and the objective variable being a past record of occurrence of chattering corresponding to the past rolling record.

公开(公告)号：US20220250129A1

公开(公告)日：2022-08-11

申请号：US17629190

申请日：2020-02-10

Applicant: JFE Steel Corporation

Inventor： Noriki Fujita ,  Yukihiro Matsubara ,  Yu Nagai ,  Yoshimitsu Harada

IPC: B21B45/02 ,  B21B1/28 ,  B21B27/10

Abstract: A rolling oil supply system is configured to supply rolling oil to a rolling stand selected from a plurality of rolling stands included in a tandem rolling mill, a first rolling oil supply system configured to circulate and supply rolling oil after removing wear powder generated by rolling, and a second rolling oil supply system configured to supply rolling oil containing the wear powder generated by rolling are provided. Mixed rolling oil in which the rolling oil supplied from the first rolling oil supply system and the rolling oil supplied from the second rolling oil supply system are mixed is supplied to selected fourth and fifth rolling stands.