Process and apparatus for forming oversized circular pipe

Details Process and apparatus for forming oversized circular pipe Process and apparatus for forming oversized circular pipe

2006-11-21

2006-11-21

Suhol, Dmitry (Department: 3725)

Metal deforming

By tool-couple pressing together adjacent surface portions...

To form helically-seamed tube

C072S370230, C072S370250

Reexamination Certificate

active

07137281

ABSTRACT:
A process for forming oversized circular pipe has the steps of affixing an elliptically-shaped forming head onto a spiral pipe forming machine, driving a metal strip along the forming head such that the metal strip takes on a shape of the forming head, moving said metal strip out of the forming head into a spiral pattern such that edges of the metal strip engage with each other so as to form an elliptically-shaped spiral pipe, removing the spiral pipe from the forming machine, and forming the elliptically-shaped pipe into a circular shape. The circular pipe has a diameter of greater then forty-eight inches. The forming head has an adjustable diameter.

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