Method and device for the inspection of a rolled strip

Abstract

The invention relates to a method and device for the inspection of a rolled strip, wherein a strip sample (M) is inspected on a first surface thereof and then turned over in order to inspect the second surface thereof. According to the invention, by displacement parallel to the longitudinal axis thereof, the strip sample (M) is placed is placed between two spaced squeezing devices (6, 6') (7, 7') which are respectively tightened on each transversal extremity (M1, M2) of the sample (M); the two squeezing devices (6, 6') (7, 7') are longitudinally separated from each other in order to place the sample in a state of tension for the visual inspection of a first surface, then the sample is turned over by simultaneous rotation of the two squeezing devices (6, 6') (7, 7') about the longitudinal axis O, with maintenance of the applied tension, in order to carry out inspection of the second surface, said tension being sufficient in order to carry out inspection without the need for placement on a table. The invention makes it possible to inspect a strip as it exits from a continuous rolling line.

Description

technical field [0001] [01] The present invention relates to a method and apparatus for inspecting strip products, in particular rolled metal strip. Background technique [0002] [02] During the rolling of a strip-shaped product such as a plate, a marquage may develop on one or the other surface of the product, for example when it comes into contact with a roll, and this marquage may be removed during the rolling process Repeats periodically, and thus continues along the coil after the tape has been wound. It is therefore necessary to regularly inspect the plate coming out of the rolling mill in order to check for possible geometrical defects in the product. For this purpose, it is proposed, for example, to use a device of the unwinder / winder type comprising an unwinder / winder connected to an inspection table. The coils to be inspected thus come out of a conventional conveyor in order to be placed on the unwinder which unwinds a length of strip on an inspection table for ...

AI Technical Summary

Problems solved by technology

Such a technique can be used on small strip samples, the inversion being done by hand, but it is often desirable to inspect over a larger length, say 10m to 15m in length, in order to detect defects that periodically occur during rolling, and these defects may have different causes

For this purpose, a sample of the desired length can be taken from the strip, but if this sample is placed on a table for honing the upper surface, the lower surface runs the risk of scarring from contact with the table, and after turning over , it is difficult to know whether these possible found defects come from the rolling or from the honing operation itself, since these defects are of the artéfact type

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