Method for forming a through-hole through the circumferential wa

Details Method for forming a through-hole through the circumferential wa Method for forming a through-hole through the circumferential wa

1998-11-12

2000-08-08

Larson, Lowell A.

Metal deforming

Process

Tube making or reshaping

29890142, 239568, B21D 2828

Patent

active

060984414

ABSTRACT:
A method for forming a through-hole through the circumferential wall of a metal pipe includes the steps of forming at least a thin portion by removing an outside circumferential surface portion of a metal pipe, and forming a through-hole in the thin portion from outside or inside and, at the same time, forming a cylindrical burring wall on the inside or outside circumferential surface side of the metal pipe. The through-hole may be formed by pressing the thin portion from outside with a punch. Alternatively, a preparatory through-hole may be formed together with the thin portion by removing the outside circumferential surface portion of the metal pipe. As a further alternative, the through-hole may be formed from outside with a punch having a larger diameter than the preparatory through-hole, or may be formed by pressing the thin portion from outside or inside by means of fluid pressure or a sphere.

REFERENCES:
patent: 4161873 (1979-07-01), Mabery
patent: 4457200 (1984-07-01), Borzym
patent: 5544514 (1996-08-01), Maier et al.

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