Method of measuring the normalized magnitude of ring opening...

Details Method of measuring the normalized magnitude of ring opening... Method of measuring the normalized magnitude of ring opening...

G - Physics

05

D

354/21

G05D 15/01 (2006.01) B21C 51/00 (2006.01) G01B 7/16 (2006.01) G01B 7/24 (2006.01)

Patent

CA 1182220

ABSTRACT First, an equation expressing the relationships among the equivalent of subsurface residual stress at a given point of the material strip before entering a spiral-pipe forming machine, the equivalent of the subsurface residual stress at the corresponding point of formed pipe, the dimensions of the material strip, the outside diameter of the pipe, and the normalized magnitude of ring opening in the pipe is established using their measured values. when, the equivalents of the subsurface residual stresses are measured while the pipe is being manufactured, and the normalized magnitude of the ring opening in the pipe is indirectly determined from the above equation using the measured equivalents.

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