Metal deforming – With use of control means energized in response to activator... – Metal deforming by use of roller or roller-like tool element
Reexamination Certificate
2000-09-18
2001-10-02
Tolan, Ed (Department: 3725)
Metal deforming
With use of control means energized in response to activator...
Metal deforming by use of roller or roller-like tool element
C072S010100, C072S013400, C072S365200
Reexamination Certificate
active
06295851
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method of monitoring the distance between the rolls of roll pairs and the rollers of roller guides of said roll pairs in a rolling line or rolling mill that includes a plurality of mutually sequential roll units, each comprising a roll pair and a roller guide for guiding a bar section, billet or like stock into a respective roll unit, during a rolling operation.
The invention also relates to a device for use when applying the inventive method, and particularly for registering movements in the roller guide that can be later used in the monitoring process.
Rod or shapes are often rolled in a plurality of roll units co-ordinated in a rolling line with the various roll pairs arranged close together, said rolls being arranged in the rolling line in such close relationship as to make visual inspection of the rolling sequence between the roll pairs impossible to carry out. It is also possible that parts of the rolling line are enclosed in a protective casing in order to prevent cooling water from splashing from the rolls into the surroundings, among other things, which also makes inspection of the rolling result between the roll pairs impossible to carry out.
Consequently, the rolling result cannot be assessed until the rod/shape has left the rolling line, and then solely by a visual examination of the rolled product leaving said rolling line. If an adjustment needs to be made, it may be necessary to stop the rolling process so as to enable a manual adjustment to be made to one of the rolls, for instance. Hitherto, no method has been proposed by means of which a maladjusted roll in a roll unit can be determined directly. Instead, the adjustment has been made essentially with a starting point from past experiences of the machine operator and the adjustment is normally made at the place where the adjustment is expected to give the intended result.
SUMMARY OF THE INVENTION
Accordingly, the object of the present invention is to provide a method and means which enable the distance between the rolls of respective roll units to be monitored during a rolling operation and as a consequence thereof also to be adjusted, so as to obtain a rolled product of high and uniform quality.
The aforesaid objects have been achieved with a method and means having the characteristic features set forth in respective associated Claims.
The invention is based on continuously sensing vibrations in the roller guides and analysing their frequency and possibly also their amplitude, so that changes in certain frequencies can be used to give an indication of the state in the roll pair that precedes the roller guide and possibly also in the roll pair that lies downstream of the roller guide in the feed direction of the stock.
REFERENCES:
patent: 4520674 (1985-06-01), Canada et al.
patent: 5272443 (1993-12-01), Winchip et al.
patent: 5515731 (1996-05-01), Weisshaar et al.
patent: 5724846 (1998-03-01), Wang et al.
patent: 2 723 011 (1996-02-01), None
patent: 61-206512 (1986-09-01), None
patent: 1-262014 (1989-10-01), None
Morgardshammar AB
Tolan Ed
Young & Thompson
LandOfFree
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