Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Arcelor France

Mitsubishi Jukogyo Kabushiki Kaisha

Arcelormittal France

Shigeru Ogawa

Atsushi Ishii

Toshiyuki Shiraishi

Yoshihiro Serizawa

Kenji Yamada

Daisuke Kasai

Ryuji Yamamoto

Yasuhiro Nishiyama

Guy Hauret

Yoshiki Takahama

Luc Vanel

Hironori Ueno

Yasuhiro Higashida

Tooru Akashi

Tetsuo Kishimoto

Masahiro Doki

Noriyuki Hishinuma

Hiroki Kato

Isao Yoshii

Yoji Nakamura

Hitoshi Nikaidoh

Yuuto Okabe

Satoru Ohta

Katsuhiko Koumoto

Shinji Ida

Nobuhiro Takagi

Maxime Laugier

Pascal Masson

Noriyuki Suzuki

Toshiaki Mizoguchi

Kazuo Koyama

Koe Nakajima

Masanori Ueda

Yoshiyuki Ueshima

Hidehiko Sumitomo

Toshiyuki Suehiro

Hiromi Matsumoto

Kunimasa Sasaki

Satoshi Akamatsu

Yoshikazu Matsumura

Takashi Furuya

Shigenori Tanaka

Toshio Kikuma

Takeo Itoh

Kiyomi Shio

Yuji Uehori

Hiroyuki Kajioka

Yoshio Morimoto

Shingo Kuriyama

Takehiro Nakamoto

Tsuyoshi Higo

Yasuhiro Higeshida

Takashi Hisatsune

Hisayoshi Matsunaga

Shyuichi Hamauzu

Yutaka Akase

Atsumu Yamane

Hiroshi Omi

Taisuke Iwaki

Kunihiko Wakatsuki

A provisional elongation strain difference distribution &#x394;&#x3b5;(x) of a metal strip during rolling is found under conditions in which out-of-plane deformation of the metal strip is restrained. A critical buckling strain difference distribution &#x394;&#x3b5;(x) is found based on the provisional elongation strain difference distribution &#x394;&#x3b5;(x), a strip thickness and strip width of the metal strip, and tension acting on the metal strip at exit from a rolling mill. When the provisional elongation strain difference distribution &#x394;&#x3b5;(x) exceeds the critical buckling strain difference distribution &#x394;&#x3b5;(x), the difference between the provisional elongation strain difference distribution &#x394;&#x3b5;(x) and the critical buckling strain difference distribution &#x394;&#x3b5;(x) is found, and added to the provisional elongation strain difference distribution &#x394;&#x3b5;(x) to find a true elongation strain difference distribution &#x394;&#x3b5;'(x). Rolling conditions are set based on the true elongation strain difference distribution &#x394;&#x3b5;&#x2032;(x), and the metal strip is rolled, thereby controlling the metal strip's profile.

Rolling control method for metal strip, rolling control apparatus, and manufacturing method for rolled metal strip

[Object] To provide a rolling apparatus capable of accurately detecting a rolling direction force applied to a work roll chock. [Solution] A rolling apparatus for flat-rolled metal materials including a pair of upper and lower work rollsandincludes a pair of work roll chocksandconfigured to hold the respective work rollsand, housingsconfigured to hold the work roll chocks, and rolling direction force measurement devices, andconfigured to measure rolling direction forces. The rolling direction force measurement devices include a plurality of load detection devices on an entry side or an exit side of the work roll chocks in a rolling direction, and the plurality of load detection devices are provided to one of the housings, and the plurality of load detection devices are disposed in a manner that, during rolling of the flat-rolled metal materials, at least two of the load detection devices are arranged adjacent to each other in a draft direction facing a side surface of a corresponding one of the work roll chocks. In this case, the at least two load detection devices are disposed in a manner that a line extending in the rolling direction and including a roll axis, which is a point of effort of a rolling direction force, is interposed between the at least two load detection devices in the draft direction.

Rolling apparatus for flat-rolled metal materials

[Object] To provide a rolling apparatus capable of accurately detecting a rolling direction force applied to a work roll chock. [Solution] A rolling apparatus for flat-rolled metal materials includes a pair of upper and lower work rollsand, and a pair of upper and lower backup rollsand. The rolling apparatus includes a pair of work roll chocksandconfigured to hold the respective work rolls, housingsconfigured to hold the work roll chocks, and load detection devicestoprovided in the work roll chocks, the load detection devices each detecting a load acting on one of the housings from one of the work roll chocks on an entry side in a rolling direction or on an exit side in the rolling direction. The load detection devices are each disposed so as to face one of the housings using a point of effort of a rolling direction force of one of the work rolls as a reference, such that a rotation moment generated on each of the work roll chocks caused by the rolling direction force is equal to a counter rotation moment generated by counterforce against the rotation moment.

A method for manufacturing a steel sheet of the invention includes a hot-rolling process in which a steel material is hot-rolled using a finishing mill so as to obtain a hot-rolled steel sheet; and a cooling process in which the hot-rolled steel sheet is cooled. The hot-rolling process includes a target steepness-setting process in which a target steepness of the edge wave shape is set based on first correlation data indicating a correlation between a steepness of the edge wave shape of the hot-rolled steel sheet and a temperature standard deviation Y; and a shape-controlling process in which operation parameters of the finishing mill are controlled so as to match the steepness of the edge wave shape with the target steepness.

Method for manufacturing steel sheet

A cooling method of a thick-gauge steel plate by spraying water from a plurality of spray nozzles on the top and bottom surfaces of the thick-gauge steel plate conveyed between the adjoining pairs of constraining rolls, each comprising a top roll and bottom roll, constraining and conveying the steel plate so as to efficiently cool the top and bottom surfaces of thick-gauge steel plate to secure symmetry of temperatures of the top and bottom surfaces and uniformity of temperature in the plate width direction and achieve improvement of flatness of thick-gauge steel plate and uniformity of quality.

Cooling apparatus of thick-gauge steel plate

A cooling apparatus for hot rolling is installed on a downstream side of a finishing mill of a continuous hot rolling mill, and cools a steel sheet rolled by the finishing mill while being conveyed. The cooling apparatus includes first pinch rolls which, during an interval when the steel sheet fed out from a final stand of the finishing mill moves from a position of the final stand to a position where a surface temperature of the steel sheet reaches 850&#xb0; C. or less, pinch the steel sheet while applying tension of 3.9 MPa or greater.

Cooling apparatus and cooling method for hot rolling

The present invention discovers that a rolling direction force occurs even with conventional adjustment by the kiss roll state, pinpoints that the rolling direction force does not affect the roll thrust force, and thereby enables more precise initial roll gap position adjustment of a rolling mill (rolling zero adjustment). That is, this is based on the fact that high precision rolling zero adjustment becomes possible without being affected by any thrust force acting between rolls if performing differential asymmetrical roll gap zero point adjustment of the work side and the drive side so that the difference of the rolling direction forces acting on the roll chocks of the work side and the drive side of the work roll at the work side and the drive side (in practice, within &#xb1;5% of the sum of the rolling direction forces at the work side and the drive side).

Rolling mill and method of zero adjustment of rolling mill

The present invention provides a method of cooling a hot-rolled steel strip which has passed through a finishing rolling, including: cooling the hot-rolled steel strip from a first temperature of not lower than 600&#xb0; C. and not higher than 650&#xb0; C. to a second temperature of not higher than 450&#xb0; C. with cooling water having the water amount density of not lower than 4 m/m/min and not higher than 10 m/m/min, wherein with respect to the area of the target surface, the area of a portion where a plurality of spray jets of the cooling water directly strikes on the target surface is at least 80%.

Cooling device of hot-rolled steel strip

The present invention provides a method for supplying lubricant to various kinds of steel sheets with different qualities in cold rolling without any restrictions, such as lubricant supplying apparatus or lubrication conditions. This method comprises storing two or more kinds of lubricant such as A and B, having different compositions, selecting one lubricant or a mixture lubricant of the above A and B in accordance with the friction coefficient between the steel sheet to be cold rolled and a work-rolls, and supplying an emulsion comprising a mixture of the lubricant A and/or B and heated water.

Method of supplying lubrication oil in cold rolling

The present invention provides a rolling mill of a plate or a sheet which eliminates rolling trouble due to warping of the rolled material and wavy shaped flatness defects running through the plate or sheet width direction such as 'waviness', 'full waves, and &#x201c;small waves' by providing a pair of a top and bottom work rolls, a pair of electric motors independently driving the pair of rolls, and control means for controlling one electric motor using the roll rotational speed as a control target value and controlling the other electric motor using the rolling torque applied to the rolled material from the work roll driven by that electric motor becoming substantially constant as a control target and using the drive torque as a control amount and a control technique of such a rolling mill of a plate or a sheet.

Rolling mill for a plate or a sheet and its control technique

The object is to strictly eliminate the difference in offset of work rolls at the upper and lower and left and right of the rolling mill occurring in the kiss roll state before rolling or during rolling and eliminate the problem of warping of the flat products or meander or camber due to the thrust force acting between the work rolls and backup rolls. For this, there are provided a rolling mill for flat products having a pair of upper and lower work rolls driven by electric motors, a pair of upper and lower backup rolls, and devices for applying substantially horizontal direction external forces to barrels or shafts of the work rolls at positions of at least one location each at the work side and drive side, for the respective upper and lower work rolls, from the entrance side or exit side of the rolling mill, the external forces being supported through work roll chocks by project blocks of the rolling mill housing or work roll chock support members connected to backup roll chocks, and the value of the rolling direction offset of the work roll axial center position and backup roll axial center position divided by the sum of the work roll radius and backup roll radius being 0.0025 or less for both the upper and lower rolls, and a rolling method for flat products using the same.

Rolling mill and rolling method for flat products of steel

A method of supplying lubricating oil in cold-rolling by emulsion lubrication, characterized by comprising:

Method of supplying lubricating oil in cold-rolling

Cooling method of hot-rolled steel strip

The object is to eliminate the difference in offset of work rolls at the upper and lower and left and right of the rolling mill occurring in the kiss roll state of the zero point adjustment work before rolling or during rolling and eliminate the problem of warping of the flat products or meander or camber due to the thrust force acting between the work rolls and backup rolls. For this, there are provided a rolling mill for flat products having a pair of upper and lower work rolls driven by electric motors, a pair of upper and lower backup rolls contacting the work rolls and supporting the rolling reaction force applied to the work rolls, and devices for applying substantially horizontal direction external forces to the upper and lower work rolls, the rolling mill for flat products characterized in that a direction of horizontal direction external forces applied to the work rolls is the same direction as the horizontal direction force component of the rolling reaction force applied to the work rolls due to the rolling direction offset and in that the horizontal direction external forces applied to the work rolls are supported by rolling mill housing project blocks or work roll chock support members, and a rolling method for flat products using the same.

Growing community of inventors

Tokyo, Japan

Shigeru Ogawa