Mastering of trimming knives position

Patent metadata

Field	Value
Publication number	US-2023415250-A1
Application number	US-202118036456-A
Country	US
Kind code	A1
Filing date	Dec 8, 2021
Priority date	Dec 15, 2020
Publication date	Dec 28, 2023
Grant date	—

Abstract

A trimming device for metallic sheets including: an upper knife, comprising a central circular face having a diameter D 1 and a thickness T 1 , mounted on an upper shaft, a lower knife, comprising a central circular face having a diameter D 2 and a thickness T 2 , mounted on a lower shaft, wherein said upper knife and said lower knife are vertically shifted with an overlap (D OVERLAP ) so as to define a shear of said metallic sheet and wherein at least one of said upper or lower shaft is able to be moved vertically, a first distance sensor, able to measure a vertical distance to the upper end of said upper knife, a second distance sensor, able to measure a vertical distance to the lower end of said lower knife, a computer able to compute the overlap.

First claim

1 - 9 . (canceled)

10 : A trimming device for metallic sheets comprising:
an upper knife including an upper knife central circular face having an upper knife diameter and an upper knife thickness, the upper knife being mounted on an upper shaft; a lower knife including a lower knife central circular face having a lower knife diameter and a lower knife thickness, the lower knife mounted on a lower shaft; the upper knife and the lower knife being vertically shifted with an overlap so as to define a shear of the metallic sheet; at least one of the upper and lower shafts being movable vertically; a first distance sensor able to measure a first vertical distance to an upper end of the upper knife; a second distance sensor able to measure a second vertical distance to a lower end of the lower knife; and a computer able to compute the overlap.

11 : The trimming device as recited in claim 10 wherein the upper knife and said lower knife are horizontally shifted to define a gap distance, at least one of the upper and lower shafts is able to be moved horizontally; the computer is able to compute the gap distance, and the trimming device further comprising: a third distance sensor able to measure a first horizontal distance to the upper knife, and a fourth distance sensor able to measure a horizontal distance to said lower knife.

12 : The trimming device as recited in claim 11 wherein the first, second, third and fourth distance sensors are inductive sensors.

13 : The trimming device as recited in claim 10 wherein the first shaft and the second shaft are both able to be moved vertically.

14 : A method of trimming metallic sheets by the trimming device as recited in claim 10 , comprising the steps of:
measuring a first vertical distance between the first distance sensor and the upper knife central circular face; measuring a second vertical distance between the second distance sensor and the lower knife central circular face; and computing an overlap based on the first and second vertical distances, the diameters of the upper and lower knives and a position of the first distance sensor relative to the position of the second distance sensor.

15 : The method as recited in claim 14 wherein an overlap working range, from L MINIMUM to L MAXIMUM , is defined, the method further comprising the steps of:
comparing L MEASURED to L MINIMUM and L MAXIMUM ,
if L MEASURED is smaller than L MINIMUM , moving vertically at least one of the upper and lower shafts to set L MEASURED at least equal to L MINIMUM ,
if L MEASURED is greater than L MAXIMUM , moving vertically at least one of the upper and lower shafts to set L MEASURED at maximum to L MAXIMUM .

16 : The method as recited in claim 14 further comprising the steps of:
measuring a first horizontal distance between a third distance sensor and the upper knife;
measuring a second horizontal distance between the fourth distance sensor and the lower knife;
computing a gap distance based on the third and fourth distances, thicknesses of the upper and lower trimming knives and a position of the third distance sensor relative to the position of the fourth distance sensor.

17 : The method as recited in claim 16 wherein a gap working range, from G MINIMUM to G MAXIMUM , is defined and wherein the method comprises the steps of:
comparing the gap distance to G MINIMUM and G MAXIMUM ,
if the gap distance is smaller than G MINIMUM , moving horizontally at least one of the upper and lower shafts to set the gap distance at least equal to G MINIMUM ,
if the gap distance is greater than G MAXIMUM , moving horizontally at least one of the upper and lower shafts to set the gap distance at maximum to G MAXIMUM .

18 : A method for assessing the wear of a trimming device for metallic sheet having:
an upper knife including an upper knife central circular face having an upper knife diameter and an upper knife thickness, the upper knife being mounted on an upper shaft; a lower knife including a lower knife central circular face having a lower knife diameter and a lower knife thickness, the lower knife mounted on a lower shaft; the upper knife and the lower knife being vertically shifted with an overlap so as to define a shear of the metallic sheet; at least one of the upper and lower shafts being movable vertically; a first distance sensor able to measure a first vertical distance to an upper end of the upper knife; a second distance sensor able to measure a second vertical distance to a lower end of the lower knife; and a computer able to compute the overlap; the method comprising:
while the upper and lower trimming knives are still, measuring an overlap, L STILL , using the method as recited in claim 14 ;
measuring an overlap, L ROTATING , with the upper and lower trimming knives being rotating, using the method;
comparing the two measurements, L STILL and L ROTATING ; and
emitting an alert if a difference between L STILL and L ROTATING is greater than a predefined threshold value L DANGER .

Assignees

• Arcelormittal

Inventors

• Touche Thomas
• Champemaud Sébastien
• Ertz Stéphane
• Hemmen Jean-Marc

Classifications

• B23D35/007 Primary

  for circular cutting members · CPC title

• B23D19/04

  having rotary shearing discs arranged in co-operating pairs · CPC title