Method and apparatus for determining the eccentricity of a...

Details Method and apparatus for determining the eccentricity of a... Method and apparatus for determining the eccentricity of a...

B - Operations, Transporting

21

B

B21B 38/04 (2006.01) G01B 17/02 (2006.01) G06F 17/14 (2006.01) B21B 19/04 (2006.01) B21B 37/78 (2006.01)

Patent

CA 2434105

A method of determining eccentricity of a hollow billet in the course of rolling in seamless tubing or seamless pipe manufacture whereby at the outlet side of an inclined roll mill at least one measurement head is provided for ultrasonic wall thickness measurement and the results of a number of measurements are processed by Fast Fourier Transform analysis series elements which approximate the eccentricity as a result of the helical or spiral superimposition of an eccentricity amplitude on the mean eccentricity in terms of the wall thickness of the hollow billet.

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