Method of manufacturing a weld neck flange

Details Method of manufacturing a weld neck flange Method of manufacturing a weld neck flange

1984-07-30

1985-10-08

Crane, Daniel C.

Metal deforming

With cutting

By shearing tool-couple

72325, 291574, 291571R, B21D 2802

Patent

active

045452318

ABSTRACT:
A pipe flange with a heavy welding neck which is hot formed from a circular section of steel plate having a small co-axial hole in the center.
The steel around the hole is shear-formed downward and outward by a tapered die plug which is forced through the small hole, forming an integral neck on the flange. A supporting ring die is radiused at its inner corner to form a suitable fillet radius at the junction of the neck with the flange proper. A suitable preforming or post-forming operation may be required to compensate for any deflection in the workpiece out of planar configuration.

REFERENCES:
patent: 580845 (1897-04-01), Buxton
patent: 2058064 (1936-10-01), Culbertson
patent: 2157354 (1939-05-01), Sherman
patent: 2859510 (1958-11-01), Baxa
patent: 3412593 (1968-11-01), Price
patent: 4339112 (1982-07-01), Connolly et al.
Timmerbeil, F. W., "Das Durchziehen von Kragen an Ebenen Blechen", from Werkstattstechnik und Maschinenbau, vol. 44, No. 5, May, 1954.
Lindberg, Roy A., Processes and Materials of Manufacture, Allyn and Bacon, Inc., Boston, Mass., Mar. 1969.

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