Title:
A flatness measuring device of the degree measuring method of flat of board material, and board material, and a manufacturing method of a steel plate
Document Type and Number:
Japanese Patent JP5994937
Kind Code:
B2
Abstract:
A method for measuring flatness of a sheet includes a step of acquiring a pattern image by projecting a light and dark pattern composed of light portions and dark portions onto a surface of the sheet, which is traveling between adjacent rolling stands, from a projection unit situated between the rolling stands, and capturing an image of the light and dark pattern with an image capture unit situated between the rolling stands, and a step of measuring the flatness by analyzing the acquired pattern image. Arrangement parameters L 0 , ±, ², hc and hp satisfy the following mathematical expression (1). 0.75 L 0 ¤ tan ± + tan ² 1 / h C 1 / h P ¤ 1.5 L 0
Inventors:
Yoshihito Isei
Tomoya Kato
Yasuhiro Aihara
Tomoya Kato
Yasuhiro Aihara
Application Number:
JP2015517125A
Publication Date:
September 21, 2016
Filing Date:
May 14, 2014
Export Citation:
Assignee:
Nippon Steel & Sumitomo Metal Corporation
International Classes:
G01B11/25; B21B38/02
Domestic Patent References:
| JPH05157537A | 1993-06-22 | |||
| JP4666272B1 | 2011-04-06 |
Attorney, Agent or Firm:
Patent Service Corporation Taiyo International Patent Office
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