Metal deforming – With use of control means energized in response to activator... – Metal deforming by use of roller or roller-like tool element
Patent
1993-10-12
1995-04-04
Crane, Daniel C.
Metal deforming
With use of control means energized in response to activator...
Metal deforming by use of roller or roller-like tool element
72339, 83208, 83 73, B21D 4328
Patent
active
054026636
DESCRIPTION:
BRIEF SUMMARY
The application is a 371 of PCT/FR92/00989, filed Oct. 21, 1992.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The subject of the present invention is a facility for hot forging workpieces starting from bars.
2. Discussion of the Background
A facility is known for hot forging workpieces starting from bars which comprises a means for heating the bars, for example using an induction furnace, a means for longitudinally moving the bars in the said facility, a shearing machine for cutting, hot, to a defined length, billets intended to be forged by closed-die forging, and including a stop for setting the billet length and a means for holding the cut billet in order to direct it towards a forging die, a means for detecting ends of the bars and a means for rejecting the billets which have a length shorter than the planned length.
This facility detects the ends of the bars by identifying a space existing between the heated bars at approximately two or three bar lengths upstream of the shearing machine.
The means for identifying the ends of the bars comprises an optical camera or a charge-coupled sensor or else photoelectric sensors which indicate the space between the said bars.
This facility therefore has the main drawback of detecting only the ends of the bars.
Now, the detected clearance, existing between the bars at a distance of two or three bar lengths before the shearing machine, is generally absorbed by slip on account of the fact that the movement of the bars is a constant-speed movement, whereas the last bar at shearing moves sequentially, by being brought up against a stop before the shearing.
The distance between and the slip of the bars, pressing up against the bar being cut, lead to a significant error in determining the length and necessitates, on average, for safety reasons, at least three billets being rejected per bar, and sometimes five or seven.
The rejection of these billets therefore generates a significant loss of material, at least three empty-die forging operations per bar and a reduction in the output in terms of the number of forged workpieces per hour.
SUMMARY OF THE INVENTION
The object of the present invention is to overcome these drawbacks by proposing a facility which ensures a minimum scrap loss of material and consequently a saving of material and a gain in production.
The subject of the present invention is therefore a facility for hot forging workpieces starting from bars, comprising a means for heating the bars, a means for longitudinally moving the bars in said facility, a shearing machine cutting, hot, to a length l, billets intended to be forged by closed-die forging, and including a stop for setting the billet length and a means for holding the cut billet in order to direct it towards a forging die, a means for detecting the ends of the bars and a means for rejecting the billets which have a length shorter than l, characterized in that the detection means is composed of at least one sensor of the image of the adjoined or non-adjoined ends of the bars, which means is placed at a distance L from the shearing machine, and a computer determining the number n=L/l of billets starting from the detected end and connected, on the one hand, to said sensor and, on the other hand, to a means for measuring the length L.sub.1 of the bars, said computer controlling the means for rejecting the billets which have a length shorter than l or which is formed by two adjoined ends of bars.
According to other characteristics of the invention: camera, operation, calibrated roller in non-slipping contact with said bars, detected, sensor is placed before the shearing machine and after the means for longitudinally moving the said bars.
BRIEF DESCRIPTION OF THE DRAWINGS
Other characteristics and advantages of the invention will appear on reading the description which follows, given solely by way of example and made with reference to the single attached figure which represents a diagram of a facility for hot forging workpieces starting from bars, according to the present invention.
DE
REFERENCES:
patent: 3972211 (1976-08-01), Linthicum
patent: 4283974 (1981-08-01), Kline
patent: 4343209 (1982-08-01), Moelbert
patent: 4727787 (1988-03-01), Schlosser
Hoffbeck Denise
Morgen Paul
Rit Jean-Paul
Ascometal
Crane Daniel C.
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