Measuring and testing – Sheet – woven fabric or fiber
Patent
1979-12-26
1982-01-12
Yasich, Daniel M.
Measuring and testing
Sheet, woven fabric or fiber
324207, G01B 714, G01L 504, G01R 3312
Patent
active
043099025
ABSTRACT:
A method for continuously measuring the steepness of a defective flatness of a metal strip during rolling, which comprises: detecting a variation in the relative distance between a metal strip during rolling and a distance-detecting means arranged adjacent to the surface of said metal strip, during the travel thereof between two support rolls arranged at a prescribed spacing, by means of said distance-detecting means, as a vibration including a vibration corresponding to a defective flatness produced in said metal strip; calculating the natural vibration frequency of said metal strip during the travel thereof between said two support rolls, from the detected value of the tension applied to said metal strip during the travel thereof between said two support rolls, the specific weight of said metal strip, and the distance between said two support rolls; cutting off the frequency components, which are below said calculated value of the frequency of said metal strip, from said detected value of the vibration of said metal strip obtained by said distance-detecting means, to detect the vibration of said metal strip, which corresponds to only the defective flatness of said metal strip; detecting, from said detected value thus obtained of the vibration of said metal strip, which corresponds to only said defective flatness, the amplitude and the frequency of said vibration; and, continuously calculating the ratio amplitude/(travelling speed/frequency) of said vibration, i.e., the accurate steepness of the defective flatness of said metal strip, from the detected values thus obtained of the amplitude and the frequency of said vibration, and the separately determined travelling speed of said metal strip.
REFERENCES:
patent: 3403548 (1968-10-01), Petrik et al.
patent: 3499306 (1970-03-01), Pearson
patent: 3502968 (1970-03-01), Tobin, Jr. et al.
patent: 3548640 (1970-12-01), Deason et al.
patent: 3720818 (1973-03-01), Spragg et al.
patent: 4031752 (1977-06-01), Sanders
patent: 4103542 (1978-08-01), Wheeler et al.
Ando Seigo
Sano Kazuo
Watanabe Katsujiro
Nippon Kokan Kabushiki Kaisha
Yasich Daniel M.
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