DETECTION METHOD FOR PLATE WARPAGE OF THICK STEEL PLATE AND PLATE WARPAGE DETECTION SYSTEM

• Main Authors: KURIMOTO ATSUSHI, NITTA KAZUHIRO, MIYANO TAIKI, OKADA NOBUYASU, KOBAYASHI NAOTO
• Format: Patent
• Language: English; Japanese
• Published: 13.12.2021
• Subjects: AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL; MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PHYSICS; PUNCHING METAL; ROLLING OF METAL; TESTING; TRANSPORTING

To make it possible that an end of a warped thick steel plate does not collide a sensor or the like installed between rolls of a table roller.SOLUTION: A detection method for plate warpage of a thick steel plate comprises: a step of measuring, by using a non-contact type range finder 3, a distance to a surface of a thick steel plate, which is transported on a thick steel plate manufacturing line; a step of discriminating, by using a distance measurement value by the non-contact range finder and line speed information concerning the manufacturing line, a shape (upward warpage or downward warpage) of the thick steel plate; a step of calculating, by using the a distance measurement value by the non-contact range finder, self-weight distortion due to non-existence of support for a tip and a tail end of the thick steel plate at an opening between rolls on the manufacturing line, and self-weight distortion in a downward warped thick steel plate during distance measurement, an upward warpage quantity or a downward warpage quantity of the thick steel plate; and a step of stopping the manufacturing line when the calculated upward warpage quantity or downward warpage quantity exceeds each preset threshold.SELECTED DRAWING: Figure 1 【課題】 板反りした厚鋼板の端部がテーブルローラーのロール間に設置したセンサーなどに衝突しないようにする。【解決手段】 本発明に係る厚鋼板の板反り検知方法は、非接触式距離計３を用いて、厚鋼板の製造ラインを搬送される厚鋼板の表面までの距離を測定し、前記非接触式距離計による距離測定値と、前記製造ラインのライン速度情報とを用いて、厚鋼板の形状（上反りまたは下反り）を判別し、前記非接触式距離計による距離測定値と、前記製造ラインのロール間の開口部で厚鋼板の先端部及び尾端部の支持が無くなることによる自重たわみと、下反り厚鋼板における距離測定中の自重たわみと、を用いて、厚鋼板の上反り量または下反り量を算出し、算出した上反り量または下反り量が予め設定したそれぞれの閾値を超えたときに、前記製造ラインを停止させる。【選択図】 図１