ARITHMETIC UNIT AND ARITHMETIC METHOD

PROBLEM TO BE SOLVED: To correct a metal plate having various defects of a shape to obtain an excellent plate shape.SOLUTION: A process computer (6) includes a main operation unit (12) which calculates a correction amount of tensile force of a tension leveler (3), and a correction amount of crowning quantity of each of divided parts (341-349) in a lower side back-up roll (34). The main operation unit (12) calculates the correction amount by using a mathematical formula including an influence coefficient individually representing an influence degree of the tensile force, and an influence degree of the correction amount of the crowning quantity on a difference between a target value and a measured value for an elongation percentage difference between two points arrayed in a width direction of the metal plate (8).SELECTED DRAWING: Figure 7 【課題】種々の形状不良を有する金属板を、良好な板形状に矯正する。【解決手段】プロセスコンピュータ（６）は、テンションレベラ（３）の、張力の補正量、および下側バックアップロール（３４）の各分割部（３４１〜３４９）のクラウニング量の補正量を算出する主演算部（１２）を備える。主演算部（１２）は、金属板（８）の幅方向に沿って配列する２点間の伸び率差の目標値と実測値との差に及ぼす、張力の補正量の影響度、およびクラウニング量の補正量の影響度をそれぞれ示す影響係数を含む数式を用いて補正量を算出する。【選択図】図７