Metal founding – Control means responsive to or actuated by means sensing or... – Control of feed material enroute to shaping area
Patent
1997-03-06
2000-04-04
Batten, Jr., J. Reed
Metal founding
Control means responsive to or actuated by means sensing or...
Control of feed material enroute to shaping area
1641544, 1641545, 1641547, 1641556, 164413, 164414, 164417, 164428, 1644491, B22D 1106, B22D 1112, B22D 1116
Patent
active
060448954
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention concerns a continuous casting and rolling system for steel strips and a corresponding control system.
BACKGROUND OF THE INVENTION
Since the very first continuous casting and rolling system as described in German patent 52,002, many different designs of such casting and rolling systems have been developed. What these developments have in common is that so far they have been successful only for low-alloy steel, when the casting system produces a so-called thin slab at least 50 mm thick (German patent 3712537), which is then fed to the first roller or cast as strips in the case of stainless steel as described in European patents 0458987 and 0481481.
OBJECT AND SUMMARY OF THE INVENTION
The object of this invention is to provide a continuous casting and rolling system and a control system that will allow production of steel strips of any grade within processing tolerances, assuming the cast strips are 5 to 20 mm thick.
This object is achieved with an optimized design of individual parts of the system with respect to their interaction to produce steel strips suitable for further processing and by coordinating the operations. Such coordination is preferably optimized by a neuro-fuzzy system.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of a control system in accordance with the invention.
FIG. 2 is a block diagram of another control system in accordance with the invention.
FIG. 3 is a block diagram of another control system in accordance with the invention.
FIG. 4 is a block diagram of another control system in accordance with the invention.
FIG. 5 is a schematic view of a rolling and casting system in accordance with the invention.
FIG. 6 is a view of the casting rolls in accordance with the invention.
FIG. 7 is an enlarged schematic view of the casting roll mechanism.
DETAILED DESCRIPTION
Advantageous details concerning the individual parts of the system and the control system are given in the following description.
Starting with a pouring stream discharged from a tundish or a fore-hearth, a hot-rolled strip approximately 2 to 4 mm thick is to be produced by rolling directly from the molten condition and subsequent forming. In individual cases, a thickness of 1 mm should be feasible. Continuous casting and rolling systems with the following basic electrotechnical components, some of which are already known, are used for this purpose.
Slide valve drive is provided with a regulation of the pouring stream on the tundish or fore-hearth. The pouring stream enters a precooling system, optionally an inlet mold, where the casting level is set with an accuracy of .+-.3 mm by means of a radiometric measurement such as that performed with an instrument manufactured by Dr. Berthold, for example. This setting does not depend on the cross section of the distribution and/or precooling system, which may be designed as a chamber or may be open at the top.
Coolant regulation and optionally a stirring device in the form of an electric coil are provided for the distribution and precooling systems, which can especially be designed as an inlet mold for thick cross sections, but it may also be designed as a distributor trough or as a box attachment with a cover. When designed as an inlet mold, it is advantageous for the design to be controllable, as described in German patent 4,030,683 A1.
The pair of casting rolls preferably have coolant regulation and also power regulation and position control and especially calculation of the instantaneous form. The shape of the casting and rolls is based on the requirements of the downstream rolling equipment, so as to yield a steel strip that conforms to the required tolerance with a minimum of adjustment. A rectangular outlet profile, especially with crowned edges, has proven to be especially suitable.
Downstream from the casting rolls, there will preferably be an electromagnetic strip control and appropriate strip guidance devices that at least partially replace the rolls customary in the past, which can lead to surface defects,
REFERENCES:
patent: 3358743 (1967-12-01), Adams
patent: 4951734 (1990-08-01), Hoffken et al.
patent: 5052467 (1991-10-01), Tanaka et al.
patent: 5058656 (1991-10-01), Hoffken et al.
Berger Thomas
Domnig Immo
Hohendahl Kurt
Horn Hannes Schulze
Kuttner Werner
Batten, Jr. J. Reed
Siemens Aktiengesellschaft
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