Patent ID: 7188496
Filing Date: 2007-03-13
Classification: B21B

Abstract:
1. A method for detecting the vibrations of a roll stand of the type comprising two pillars which each form a ring and between which are located a set of rolling rolls, formed by at least two working rolls, which enable the thickness of the product to be rolled to be reduced and which are stacked in a substantially vertical plane constituting the adjusting plane and are mounted to rotate in chocks forming bearings, which chocks are mounted to slide vertically between guide surfaces supported by the upright portions of the pillars, the roll stand comprising means for adjusting the rolls by means of hydraulic jacks resting on a horizontal portion of each pillar and exerting the adjusting force on the chocks of the rolls, the hydraulic jacks also comprising a position sensor which gives at each instant a signal representative of the position of the mobile portion of the hydraulic jack, and of the chock, relative to the fixed portion of the hydraulic jack, and to the horizontal portion of each pillar, wherein the measurement signal of the position sensor is memorized in real time and permanently, in that a sample of that signal is compared directly with a spatio-temporal observation window, the size of the sample and the dimensions of the window being chosen as a function of the roll stand and the frequency of the vibrations to be detected, and in that a vibration detection signal is triggered when the signal sample is no longer contained within the window.