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US 10,112,793 B2Granted
Opening method and device thereof
AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsYoshiaki Nunota, Takahiro Fujioka
Life of this patent
Estimating the term…
Abstract
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 × Z 2 EI R 2 ( 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.
Claims16
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 and contacting a blade tip of the opening blade body onto the outer peripheral surface of the metal coil;
- rotating the metal coil in an opposite direction to a take-up direction of the metal coil to insert the blade tip inside the metal sheet from a leading end portion of the metal sheet to separate the leading end portion of the metal sheet from the metal coil using the opening blade body;
- and
- continuing rotation of the metal coil in the opposite direction to support an inner peripheral surface of the metal sheet at a load action point of the metal sheet at which the inner peripheral surface of the metal sheet is supported by a supporting portion of the opening blade body using the opening blade body with the leading end portion of the metal sheet in a free state so as to satisfy the following Equation (1) and Equation (2):
- K
- =
- Yp
- ×
- Z
- 2
-
- EI
-
- R
- 2
-
- (
- Θ
- -
- sin
-
-
- Θcos
-
-
- Θ
- )
- [
- Equation
-
-
- (
- 1
- )
- ]
- U
- ≤
- K
- [
- Equation
-
-
- (
- 2
- )
- ]
- wherein:
- U is an opening radial direction dimension, from the load action point of the metal sheet 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 −( 1/2 ) 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 that is nearest to the load action point along a rewind direction of the metal coil.
54 more elements
An opening device, comprising:
- a cradle mechanism including a plurality of restraining rolls that rotatably restrain an outer peripheral surface of a metal coil of a wound metal sheet;
- a drive section that drives the cradle mechanism so that the metal coil is rotated in a take-up direction or an opposite direction to the take-up direction;
- a disposing mechanism that is configured to dispose an opening blade body such that a blade tip of the opening blade body is contacted onto an outer peripheral surface of the metal coil, when the metal coil is rotated in the opposite direction to the take-up direction of the metal coil by the cradle mechanism and the drive section, the blade tip is inserted inside the metal sheet from a leading end portion of the metal sheet to separate the leading end portion of the metal sheet from the metal coil using the opening blade body, and when rotation of the metal coil in the opposite direction is continued by the cradle mechanism and the drive section, an inner peripheral surface of the metal sheet is supported at a load action point of the metal sheet at which the inner peripheral surface of the metal sheet is supported by a supporting portion of the opening blade body using the opening blade body with the leading end portion of the metal sheet in a free state so as to satisfy the following Equation (1) and Equation (2);
- and
- a cutter that cuts the leading end portion of the metal sheet, to obtain a test sample, in a state in which the opening blade body is disposed such that the inner peripheral surface of the metal sheet is supported at the load action point of the metal sheet by the opening blade body so as to satisfy the following Equation (1) and Equation (2):
- K
- =
- Yp
- ×
- Z
- 2
-
- EI
-
- R
- 2
-
- (
- Θ
- -
- sin
-
-
- Θcos
-
-
- Θ
- )
- [
- Equation
-
-
- (
- 1
- )
- ]
- U
- ≤
- K
- [
- Equation
-
-
- (
- 2
- )
- ]
- wherein:
- U is an opening radial direction dimension, from the load action point 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 an 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 (=( 1/6 ) 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 −( 1/2 ) 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 that is nearest to the load action point along a rewind direction of the metal coil.
54 more elements
Dependencies are inferred from the claim text.