Cold rolling process for metal tubes

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

2007-03-13

2007-03-13

Suhol, Dmitry (Department: 3725)

Metal deforming

By use of roller or roller-like tool-element

With tool inside hollow work

C072S370010

Reexamination Certificate

active

11475116

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 mandrel factors like the taper θ1in the primary deformation zone of the mandrel and the taper θ2in the final size reduction zone thereof, and the feed rate F of the workpiece material, and at the same time by properly adjusting the relationship between the side relief rate SR and the feed rate F, 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.

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patent: 2001-105009 (2001-04-01), None

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