Method of measuring the normalized magnitude of ring opening in

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

1982-08-18

1984-12-04

Combs, E. Michael

Metal deforming

With use of control means energized in response to activator...

Metal deforming by use of roller or roller-like tool element

72 49, B21B 3700, B21C 3712

Patent

active

044856504

ABSTRACT:
First, an equation expressing the relationships among the equivalent of the subsurface residual stress at a given point of 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. Then, 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.

REFERENCES:
patent: 3639760 (1972-02-01), Mizunuma
patent: 3792348 (1974-02-01), Rollwitz et al.
patent: 3845645 (1974-11-01), Gebauer
patent: 3979231 (1976-09-01), Gondo et al.
patent: 4128762 (1978-12-01), Nagao et al.
patent: 4316146 (1982-02-01), Jilken
patent: 4416131 (1983-11-01), Davis
patent: 4436239 (1984-03-01), Tsuyama et al.

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