Title:
板材の平坦度測定方法及びこれを用いた鋼板の製造方法
Document Type and Number:
Japanese Patent JP4666272
Kind Code:
B1
Abstract:
An objective of the present invention is to provide a method for measuring the flatness of a sheet material, in which even in the case where an image pickup device is arranged at a position at which the specularly reflected light of a light and dark pattern projected onto the surface of a sheet material having a strong specular reflection property can be received, the surface shape and the flatness of the sheet material can be measured with high accuracy. The method of the present invention uses a staggered pattern as the light and dark pattern projected onto the surface of the sheet material, the staggered pattern being composed of light portions arranged in a staggered form at a predetermined preset pitch in a longitudinal direction and a transverse direction. The method sets a shape measurement line extending along the longitudinal direction of the staggered pattern in the acquired pattern image by the image pickup device. The method averages picture element concentrations on a straight line which passes through a picture element on the shape measurement line and extends in the transverse direction of the staggered pattern, and has a length two times or more the transverse preset pitch between the light portions to calculate an average picture element concentration. The method calculates a surface shape of the sheet material based on the average picture element concentration distribution along the shape measurement line, and calculates the flatness of the sheet material based on the calculated surface shape.
Inventors:
Yoshihito Isei
Tomoya Kato
Masahiro Osugi
Tomoya Kato
Masahiro Osugi
Application Number:
JP2010541650A
Publication Date:
April 06, 2011
Filing Date:
August 03, 2010
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
G01B11/30; B21C51/00
Domestic Patent References:
| JP2008058036A | 2008-03-13 |
Attorney, Agent or Firm:
Minoru Ohnaka