OPERATION CONTROL METHOD OF TANDEM ROLLING MILL, AND METHOD FOR PRODUCING HOT-ROLLED STEEL SHEET USING SAME

WIPO Patent Application WO/2011/125498

A1

Disclosed is an operation control method of tandem rolling mill that enables rolling under high pressure at a latter-stage stand that is of the tandem rolling mill and that is necessary in such purposes as the production of fine-grained steel. Further disclosed is a method for producing a hot-rolled steel sheet. The operation control method of a tandem rolling mill includes a first step for determining outgoing-side sheet thickness at each stand when rolling a constant region of a rolled member, and a second step for determining the outgoing-side sheet thickness of each stand when rolling the tip of the rolled member in a manner so that a pre-fastening load is no greater than a set value; the rolled member is rolled in a manner so as to become the outgoing-side sheet thickness determined in the second step at least until the very tip of the rolled member is engaged by each stand; the constant region of the rolled member is rolled to the outgoing-side sheet thickness determined in the first step by means of the N-m+1-th stand to the N-th stand; and the outgoing-side sheet thickness from the N-m+1-th stand to the N-th stand determined in the second step is thicker than the outgoing-side sheet thickness determined in the first step. The method for producing a hot-rolled steel sheet has a step that rolls a steel sheet using a hot-finishing mill array, the operation of which is controlled by said operation control method.

NIKKUNI, Daisuke (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
新國　大介 (〒41 大阪府大阪市中央区北浜４丁目５番３３号　住友金属工業株式会社内 Osaka, 〒5410041, JP)
FUKUSHIMA, Suguhiro (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
福島　傑浩 (〒41 大阪府大阪市中央区北浜４丁目５番３３号　住友金属工業株式会社内 Osaka, 〒5410041, JP)
WASHIKITA, Yoshiro (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
鷲北　芳郎 (〒41 大阪府大阪市中央区北浜４丁目５番３３号　住友金属工業株式会社内 Osaka, 〒5410041, JP)

JP2011/056926

October 13, 2011

March 23, 2011

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SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 Osaka, 〒5410041, JP)
MITSUBISHI-HITACHI METALS MACHINERY, INC. (34-6, Shiba 5-chome Minato-k, Tokyo 14, 〒1080014, JP)
三菱日立製鉄機械株式会社 (〒14 東京都港区芝五丁目３４番６号 Tokyo, 〒1080014, JP)
NIKKUNI, Daisuke (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
新國　大介 (〒41 大阪府大阪市中央区北浜４丁目５番３３号　住友金属工業株式会社内 Osaka, 〒5410041, JP)
FUKUSHIMA, Suguhiro (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
福島　傑浩 (〒41 大阪府大阪市中央区北浜４丁目５番３３号　住友金属工業株式会社内 Osaka, 〒5410041, JP)

B21B37/72; B21B1/26

YAMAMOTO, Noriaki et al. (3rd Floor Oak Building Kyobashi, 16-10, Kyobashi 1-chome, Chuou-k, Tokyo 31, 〒1040031, JP)

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