OPENING METHOD AND DEVICE THEREOF

摘要

An opening radial dimension is set as a radial direction permissible dimension K of the metal coil as expressed by the following equation or lower.;K=Yp×Z2EIR2(Θ-sinΘcosΘ);Wherein: K is a radial direction permissible dimension at the load action point position in mm; Yp is a yield stress of the metal sheet, in kgf/mm2; Z is a section modulus of the metal sheet, in mm3; R=(a metal coil radius r)−½(the plate thickness t of the metal sheet), in mm; E is a Young's modulus of the metal sheet, in kgf/mm2; I is a second moment of area of the metal sheet in mm4; and Θ is an angle in radians about the axis of the metal coil from the load action point to the nearest restraining roll along a rewind direction of the metal coil.

主权项

1. An opening method, comprising:
restraining an outer peripheral surface of a metal coil of a wound metal sheet with a plurality of restraining rolls; disposing an opening blade body so as to satisfy the following Equation (1) and Equation (2), and contacting a blade tip of the opening blade body onto the outer peripheral surface of the metal coil; and rotating the metal coil in an opposite direction to a take-up direction of the metal coil, separating a leading end portion of the metal sheet from the metal coil using the opening blade body, and supporting an inner peripheral surface of the metal sheet using the opening blade body with the leading end portion of the metal sheet in a free state:K=Yp×Z2EIR2(Θ-sinΘcosΘ)[Equation(1)]U≤K[Equation(2)] wherein: U is an opening radial direction dimension, from a load action point at which the inner peripheral surface of the metal sheet is supported by the opening blade body, to the outer peripheral surface of the metal coil, in mm; K is a radial direction permissible dimension at the load action point position, from the inner peripheral surface of the metal sheet to the outer peripheral surface of the metal coil, in mm; Yp is a yield stress of the metal sheet, in kgf/mm2; Z is a section modulus of the metal sheet (=(⅙)bt2), in mm3, wherein b is a width of the metal sheet, in mm, and t is a plate thickness of the metal sheet, in mm; R is a metal coil radius r from which one-half of the plate thickness t of the metal sheet has been subtracted (r−(½) t), in mm; E is a Young's modulus of the metal sheet, in kgf/mm2; I is a second moment of area of the metal sheet, in mm4; and Θ is an angle in radians about an axis of the metal coil from the load action point to a portion restrained by a nearest restraining roll of the restraining rolls along a rewind direction of the metal coil.