Hot-rolled steel bar with helically extending ribs, method of an

Details Hot-rolled steel bar with helically extending ribs, method of an Hot-rolled steel bar with helically extending ribs, method of an

1988-10-25

1990-09-04

Larson, Lowell A.

Metal deforming

By use of 'flying tool' engaging moving work

Included in plural deforming stations or passes

72198, B21H 300

Patent

active

049533797

ABSTRACT:
In the production of a hot-rolled steel bar, such as a concrete reinforcing bar, a continuous thread is formed on the bar. The thread is arranged so that an anchoring or connecting member with a female thread can be screwed onto the male thread formed on the bar. Initially, first ribs are hot rolled on the bar surface with the ribs located on opposite sides of the bar and extending only for a portion of the circumference of the bar. Immediately following the formation of the first ribs, second ribs are hot rolled extending between and interconnecting the first ribs whereby the first and second ribs form a continuous thread. The ribs are formed in a unit made up of adjacent roll stands, each containing two rolls, the axes of the rolls in one stand are offset by 90.degree. to the axes of the rolls in the other stand. The rolls are interconnected so as to move together. The rolls in each roll stand form a roll gap with shaped surfaces on the rolls for defining the partial ribs forming the continuous thread.

REFERENCES:
patent: 116218 (1871-06-01), Prosser
patent: 879444 (1908-02-01), Crane
patent: 2089311 (1937-08-01), Tolles
patent: 3653246 (1972-04-01), Bock et al.
patent: 3722249 (1973-03-01), Stosha et al.
patent: 4137686 (1979-02-01), Kern
"Als Betonbewehrung dienender Spannstahl", Eisenwerk-Gesellschaft Maximilianshutte mbH. Sulzbach-Rosenberg Hutte, Apr. 30, 1964.

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