Cold rolling process for metal tubes

Details Cold rolling process for metal tubes Cold rolling process for metal tubes

2007-04-03

2007-04-03

Suhol, Dmitry (Department: 3725)

Metal deforming

By use of roller or roller-like tool-element

With tool inside hollow work

C072S370010

Reexamination Certificate

active

11475115

ABSTRACT:
In the cold rolling process by pilger rolling that holds a mandrel between each of paired roll-dies, by optimizing the side relief rate SR and the pass schedule factors such as the Area Rd, ID Rd and the feed rate F of the workpiece material, and further by properly selecting the taper θ1in the primary deformation zone of mandrel and the taper θ2in the final size reduction zone thereof, the dimension-related shape characteristics (near-perfect round shape) of the tube inside surface after the final finishing rolling process by pilger rolling can be ascertained to thereby ensure excellent surface property without requiring a new apparatus, and further without causing the decrease of the product yield and/or the increase of the manufacturing costs. Thus, this can be widely applied for producing steam generator tubes which exhibits high S/N ratio in the inner coil eddy current testing.

REFERENCES:
patent: 1858990 (1932-05-01), Foren
patent: 2074271 (1937-03-01), Peters
patent: 5156035 (1992-10-01), Lampe et al.
patent: 5218851 (1993-06-01), Imae
patent: 5657659 (1997-08-01), Yamada
patent: 6250125 (2001-06-01), Ukai et al.
patent: 6-019902 (1994-03-01), None
patent: 2001-105009 (2001-04-01), None

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