Process and installation for preparing metal billets to be extru

Cutting – Processes – Plural cutting steps

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Details

83 768, 83168, 83170, 83364, 83365, 83370, B23D 3302

Patent

active

049442066

ABSTRACT:
The invention relates to a process for preparing metal billets from bars (5) and to an installation comprising a heating furnace (2), means (10) for advancing the bars (5, 51) one behind the other along a straight path through the furnace (2), and hot shears (3) defining a shearing plane (Q) placed after the exit of the furnace (2).
According to the invention, the possible passage of the parting plane (6) between the bar (5) being cut and the following bar (51) through a stationary locating plane (P) intersecting the path of the bars at a point placed at a distance (Y) upstream of the shearing plane (Q) at least equal to the length (b) of a billet is monitored, and, in the event that such a passage is detected, from that moment the length of advance (X) of the bar (5) up to the stopping of the latter for shearing is measured continuously, then the remaining length (a=Y-X) of the bar (15) being cut and then the expected length of the remnant (c=a-nb) after the cutting of a whole number (n) of billets of normal length (b) counted from said detected passage moment are calculated, and the said remaining length (c) is compared with a given limit (L) in order to command the elimination of the oddments of a length below the said limit.

REFERENCES:
patent: 4152959 (1979-05-01), Elhaus
patent: 4328725 (1982-05-01), Gschwend
patent: 4534002 (1985-08-01), Urban
patent: 4559854 (1985-12-01), Jurgens
patent: 4651602 (1987-03-01), Harrold et al.
patent: 4677838 (1987-07-01), Bessey et al.
patent: 4787281 (1988-11-01), Gardner

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