Method and device for controlling a rolled product thickness at a tandem rolling mill exit
AssigneeSiemens Vai Metals Technologies GmbH
InventorsMichel Abi Karam, Stéphane Gouttebroze
Life of this patent
Estimating the term…
Abstract
A method and device for controlling the final thickness of a rolled product at a tandem rolling mill exit which make it possible to remove the cyclic defects of the product thickness variation. The method includes using at least one rolling stand provided with hydraulic adjustment devices located on the tandem rolling mill exit and in compensating the cyclic defects of the product thickness variation generated upstream through the entire rolling mill on the stand with the aid of an adjuster (R) coordinated with the frequency of defects. The method and device are suitable for tandem cold rolling mills producing metal strips. The thickness defects are detectable by a thickness sensor.
Claims18
A method for controlling a final thickness of a rolled product at an exit of a rolling mill comprising the steps of:
- operating in tandem at least two rolling mill stands equipped with adjustable clamping means of a set of rolling rolls, linking the mill to an automatic device for controlling an exit thickness and tension of the product in each space between two successive stands and to a general device for monitoring the speeds of the rolling mill stands, installing hydraulically controlled clamping means on at least a last stand, and compensating a thickness cyclic perturbation present in the product and likely to be measured on the rolling mill by action of a regulator tuned to a frequency of said cyclic perturbation on the hydraulically controlled clamping means of at least one stand situated downstream from the stand from which the cyclic perturbation originated.
A device for controlling a thickness of a strip at an exit of a rolling mill comprising at least two stands operating in tandem, each said stand being equipped with adjustable clamping means for a set of rolling rolls, hydraulically controlled means on at least a last one of said stands, the rolling mill being linked to an automatic device for controlling an exit thickness and tension of the strip in each space between two successive stands, and to a general device for monitoring speeds of the rolling stands, and at least one compensation device for compensating thickness cyclic perturbations present in the rolled strip, acting in closed loop and in real time on the hydraulically controlled clamping means of at least one stand situated downstream from the stand from which the cyclic perturbations originated by forming a compensation signal from a signal from a thickness gauge.
A rolling mill comprising at least two rolling mill stands operating in tandem, each stand being equipped with adjustable clamping means for a set of rolling rolls, the mill being linked to an automatic device for controlling an exit thickness and tension of a product in each space between two successive stands, and to a general device for monitoring speeds of the rolling mill stands, hydraulically controlled means on at least a last stand for clamping rolls and at least one compensation circuit for compensating thickness cyclic perturbations present in the rolled product, acting in closed loop on the hydraulically controlled clamping means of at least one stand situated downstream from the stand from which the cyclic perturbations originated.
Dependencies are inferred from the claim text.