Method and apparatus for manufacturing hollow steel bars

Details Method and apparatus for manufacturing hollow steel bars Method and apparatus for manufacturing hollow steel bars

1996-06-11

1997-12-23

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

With modification or control of temperature of work, tool or...

72 97, B21B 1904

Patent

active

056996900

ABSTRACT:
A method of manufacturing hollow steel bars comprising the steps of preparing a hollow billet with the dimensions meeting a condition expressed by the following formula (1) by piercing a steel billet with a piercer after heating, inserting a mandrel as an inner surface sizing tool into a hollow billet, and then rolling the hollow billet on a cross-rolling mill having three rolls arranged around a pass line to provide plastic working for reduction of the outside diameter and adjustment of the wall thickness of the hollow billet so as to meet a condition expressed by the following formula (2), and a manufacturing apparatus comprising an electric resistance heating unit, the piercer, and the cross-rolling mill, wherein

REFERENCES:
patent: 1993427 (1935-03-01), Widuch
patent: 2264455 (1941-12-01), Peck
patent: 4510787 (1985-04-01), Hayashi et al.
Iron and Steel Handbook, vol. 3, 2, Iron and Steel Association of Japan, Jan. 1982, pp. 984-996.
Evans et al., "Diescher--The Mill for Tomorrows's Quality", Iron and Steel Engineer, Feb. 1968, pp. 93-98.

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