Method for eliminating of longitudinal upset seams

Details Method for eliminating of longitudinal upset seams Method for eliminating of longitudinal upset seams

1990-04-10

1991-09-24

Larson, Lowell A.

Metal deforming

By use of non-deforming work-gripping clamp and relatively...

Plural or complex apparatus

72356, B21J 0506

Patent

active

050504193

ABSTRACT:
In accordance with the invention, immediately after the completion of the upsetting process using an upset tool to form a pipe end of increased wall thickness, the upset half shells which have been pressed together are opened and the supporting mandrel is withdrawn. After the lifting of the pipe end out of the tool, the longitudinal upset seams formed during the upset operation are rotated through a predetermined angle in a plane to which the axis of the pipe is perpendicular and out of the parting plane of the upset half shells. The pipe end is again pressed into the working plane while maintaining its previous axial position to the tool. After the reintroduction of the supporting mandrel, the pipe end is additionally pressed radially to substantially eliminate the longitudinal upset seams.

REFERENCES:
patent: 2027406 (1936-01-01), Spatta
patent: 2212903 (1940-08-01), Steigerwalt
patent: 3570298 (1971-03-01), Detzel et al.

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