EP0894546A2 - Method and device for deflecting a rolled strand - Google Patents

Abstract

Deflection of a rolled material segment (2) moving at high speed is achieved by subjecting it to a perpendicular electromagnetic force (F). The force is produced by a current which flows through the material segment and through a fixed current conductor (5). As a consequence of this force, the material segment is pivoted away from the current conductor (5). The apparatus includes a current carrier (5) which has a contact electrode (6). The current carrier (5) is connected to another contact electrode with a current source (7), a capacitor (8) and a spark switching unit (9). The distance between the rolled material and the contact electrodes (6, 10) is such that an arc (11) can be produced between them.

Description

The invention relates to a method and a device for deflecting a roller core that moves at high speed.

It is known to scoop or separate a moving roll core at rolling speed in rolling mills in order, for. B. in the subsequent rolling stands to improve the tapping conditions or to separate areas that do not meet quality requirements and to feed the scrap.
In order to adapt to the high rolling speeds, the rolling vein is essentially cropped or separated using so-called flying shears (EP 0 297 313 B1; DE 35 23 046 A1).
However, with their high speeds and minimal switching times for the switches, these scissors represent very complicated mechanical systems. High drive power is required to accelerate the associated switch systems. The mechanical wear on the cutting blades and the switch parts is great.
At rolling speeds of over 80 m / s, these systems can only be mastered in terms of control technology and mechanically with great technical effort due to the acceleration forces.
To extend the switching times of the turnouts, the turnout systems have to be made very long.

It is also known to guide the rolling wire by means of switches to subsequently arranged machines or to feed the cut ends to a suitable scrap disposal facility. The switches are driven by means of hydraulic cylinders, pneumatic cylinders, electric motors, movement screws and / or a combination of these drives.
The biggest problem here, as already noted above, is in particular the switching times of the turnout systems with less than 1/10 seconds required at high rolling speeds.
DE 35 23 046 discloses such a guide device for deflecting the rolling core, which is brought into contact with the rolled material in order to guide it into the corresponding guide channels.

It should be noted that by direct contact of the roller core with the guide devices, the z. B. can also be designed as a deflector flap, it can lead to a breakout of the roller core and thus to an accident at high roller core speeds.
In order to eliminate these disadvantages described, it is known according to DD 145 503 to deflect the rolling wire in such a way that a force is exerted on it by means of an external magnetic field surrounding the rolling wire, generated by a correspondingly large magnetic coil and a current flowing through the rolling wire becomes.
The technical effort for generating the magnetic field can be assessed as considerable. Furthermore, the magnetic field in the magnetic coil is not very strong due to the large dimensions of the same and the relatively large distance from the magnetic field of the rolling core and is therefore only suitable for limited applications.
Likewise, the power supply via sliding contacts hardly seems practical since the wear strips would be used up very quickly at high rolling speeds. It is also not clear how the vein should be held on the strips.

The object of the present invention is to overcome the disadvantages of the introduction to avoid the described state of the art and at reasonable Capital expenditure and low mechanical engineering use To increase the performance of rolling mills, i.e. an elevated To achieve throughput and to improve the quality of the rolling veins. In particular, at high rolling speeds of over 80 m / s safe deflection of any sections of the roller core can be realized, where impulsive and widely adjustable forces on the rolling core are to be applied without significantly increasing the kinetic energy of the rolling core is reduced or the smooth running is impaired.

According to the invention, the object in a method of generic type according to the characterizing part of the Claim 1 solved in that the roll core perpendicular to Rolling direction an electromagnetic force caused by the A current flows through the rolling wire and one to the rolling wire in approximately the same level, permanently arranged Stromleiters, is applied, the deflection of the rolling core from Current conductor caused away.

In a particularly advantageous embodiment of the method, it is provided that the electrical current is transmitted to the rolling wire without contact by means of an arc.
Precisely because of the small effective distance of the magnetic fields acting on one another as a result of these measures, the prerequisite for the generation of correspondingly high magnetic forces is given.
It has been shown to be particularly suitable if the electromagnetic force is defined in a predetermined core section of the roller core and is applied in an abrupt manner.

Furthermore, it is proposed that the roller core be deflected by means of such a high electromagnetic force that the roller core automatically cross-divides when striking a shear element arranged in a stationary manner or moving at the rolling speed in the rolling direction.
As a result of this measure, the electromagnetic effect is used to produce high-speed shears, it being particularly advantageous to dispense with large masses to be moved, cost-intensive drives and control technology.

In a further embodiment of the method it is proposed that the electromagnetic force acting is used as a deflecting force for guiding the rolling wire in a direction other than the rolling direction.
Here the electromagnetic effect becomes. Generation of a high-speed switch used.
The advantage of this measure is in particular that due to the high speed of this new switch, the distance between the upstream facilities such. B. scissors and the switch according to the invention can be kept extremely low. Furthermore, the proportion of wearing parts is significantly reduced.

As a suitable measure, a defined one is also proposed generate electromagnetic counterforce during the deflection the roller core strikes fittings and / or guide devices the rolling mill with the disadvantages known per se prevented.

The invention also relates to a device for deflecting the rolling wire, which moves at high speed, the device according to the invention consisting of a permanently arranged, opposite contact with the rolling wire in an approximately same plane, provided with a contact electrode, which in turn via a current source, a capacitor and a triggered switching spark gap is connected to a further contact electrode and the contact electrodes are at such a distance from the rolling wire that an arc can be generated between the rolling wire and each contact electrode.
The special arrangement ensures on the one hand short distances between the acting magnetic fields, on the other hand there is the possibility of using arcs to transmit the required currents of up to 10 ⁵ A to the roller core, the pulse effect being advantageously used when the capacitor is discharged.

In a development of the device, it is provided that the current conductor parallel to Arrange the roll core.

Further variants provide that the current conductor is formed in a straight line, but is arranged at a defined angle to the rolling wire, that the current conductor has a defined curve shape, or that the current conductor can have different cross-sections over its length.
There is thus the possibility of concentrating the maximum force effect on a defined area, which is particularly noticeable when the device is used as high-speed shears.
In this case, a shear element is assigned to the device for deflecting the rolling wire according to the invention opposite in the deflection area of the rolling wire in such a way that the wire rod can be passed in the same plane between the device for deflecting and the shear element.
The shear element can be designed to be stationary or movable at rolling speed in the rolling direction.

Furthermore, it is advisable to use the shear element as Make anvil with a cutting edge that supports the cut.

In a further variant, it is possible to use the device for Deflection of a rolling wire in the rolling direction seen as electromagnetic High-speed switch immediately before the deflection area from the To arrange the rolling line.

In order for the deflected rolling core to strike against fittings and / or To prevent leadership, it may be appropriate Device for deflecting a rolling wire a functionally identical, arranged in mirror image on the opposite side of the rolling line Assign device for deflecting a roller core.

Fig. 1:

Situation beim Einlauf der Walzader in den Bereich der Vorrichtung zum Auslenken einer Walzader,

Fig. 2:

Situation beim Auslenken des nicht qualitätsgerechten Aderanfangs zum Abführen desselben in die Schrottbahn,

Fig. 3:

Situation während der Krafterzeugung zum Querteilen der Walzader,

Fig. 4:

Situation während des Abführens des Aderanfangs in die Schrottbahn,

Fig. 5:

Situation während des Einlaufens der Gutader in Richtung des Windungslegers,

Fig. 6:

eine weitere geeignete Ausführungsvariante.

Further details, features and advantages of the invention result from the following explanation of an exemplary embodiment shown schematically in the drawings.
The drawing shows the procedural sequence and the mode of operation of the device for deflecting a rolling wire, which in the present exemplary embodiment is arranged in front of a winding layer (not shown here) and can be used according to the invention as a high-speed shear and / or as a high-speed switch in order to separate scrap and good wires.
Show it:

Fig. 1:

Situation when the rolling wire enters the area of the device for deflecting a rolling wire,

Fig. 2:

Situation when deflecting the non-quality beginning of the wire to lead it into the scrap track,

Fig. 3:

Situation during the force generation for cross-cutting of the rolling core,

Fig. 4:

Situation during the removal of the core start into the scrap track,

Fig. 5:

Situation during the running of the Gutader towards the winding layer,

Fig. 6:

another suitable design variant.

1, the device 1 for deflecting the rolling wire 2 perpendicular to the rolling line, viewed in the direction of movement of the rolling wire 2, is arranged in front of a winding layer, not shown.
The rolling stock guide 3 opens into a funnel-shaped extension 4 between the device 1 and the winding layer and is divided into a scrap wire guide 3a and a good wire guide 3b, the scrap wire guide 3a leading out of the rolling line at a suitable angle. A further device 1 ′ for deflecting the rolling core 2 can be arranged between the device 1 and the winding layer in the immediate vicinity of the funnel-shaped extension 4 or in the funnel-shaped extension 4 of the rolling stock guide 3.

The device 1; 1 'for deflecting the roll core 2 consists of a Walzader 2 faced and fixed in approximately the same plane arranged current conductor 5, which in turn is one in the direction of the roll core 2 Pointing contact electrode 6 and a current source 7, one Capacitor 8 and a triggered switching spark gap 9 with another is connected to the rolling wire 2 facing contact electrode 10. The distance between roll core 2 and the contact electrode 6 and 10 is chosen so that an arc 11 between the wire core 2 and each contact electrode 6; 10th can be generated.

As can be seen in FIG. 1, the beginning of the wire of the roller core 2 moving at high speed has already passed the device 1 and reaches the device 1 ′ which is designed in the same way. At this moment, the previously charged capacitor 8 is discharged via the associated switching spark gap 9, which acts as a switch, an arc 11 is ignited at the contact electrodes 6 and 10 and the circuit is closed.
The magnetic fields generated both in the rolling wire 2 and in the current conductor 5 cause a repulsive magnetic force on the current-carrying parts, so that a force F, which acts perpendicular to the rolling line and in a jerky manner and away from the current conductor 5 on the wire beginning, applies the same in the direction of the scrap wire guide 3a deflects (Fig. 2).

The relative movement of the beginning of the wire is composed of the axial movement (V _A ) of the rolling core 2 and the radial movement (V _R ) of the beginning of the wire. The inlet of the core start is supported by a funnel-shaped design of the scrap wire guide 3a. The device 1 'thus functions in the present case as a high-speed switch.

Has the rolling core 2 run sufficiently far into the scrap core guide 3a and has reached the point at which the scrap vein is separated from the gut vein is to be, the switching spark gap 9 of the upstream Device 1 for deflecting the roller core 2 and the associated capacitor 8 unload. Ignite on the associated contact electrodes 6 and 10 by the applied high voltage potential from the capacitor 8 current-transmitting arcs 11, whereby the electromagnetic Working circuit is closed in an extremely short time. The through the Current flow generated magnetic fields, as already mentioned and in 3 shows a repulsive magnetic force on the current-carrying parts, so that the wire core 2 perpendicular to the rolling line and from the current conductor 5th away abruptly against a device 1 in approximately the same plane opposite and arranged in the deflection area of the rolling core 2 Shear element 12 strikes. The force F is for realizing one High-speed shear through the defined capacitor current discharge set so high that the rolling wire 2 automatically cross-divided (Fig. 4).

The shear element 12 is arranged stationary in the present case and as Anvil executed as well as with a cutting support Providing cutting edge 13, but it may be advantageous if to move the shear member 12 at the rolling speed in the rolling direction and then make the cut at a convenient location to make the To minimize braking effect on the rolling core 2 during the cut.

Furthermore, there is the possibility of changing the current conductor 5 itself in such a way that a maximum force effect on an arbitrarily defined area of the rolling core 2 is also concentrated in relation to the shear element 12. For example, the current conductor 5 can be straight, but be arranged at a defined angle to the rolling core 2, or the current conductor 5 has a defined curve shape in the plane and / or the current conductor 5 itself has a different cross-section over its length.
These measures make it possible to influence the intensity and effect of the magnetic fields in a region-specific manner.

5 shows the situation where the Gutader is now in the Roll line through the Gutaderführung 3b through not closer shown and known winding layer is performed. A if necessary, slight deformation of the core tip of the gut core is caused by balanced the funnel-shaped inlet of the Gutadführung. Usually will also be the core end of the wire core 2, which if necessary Quality defects, separated from the Gutader and the Scrap wire guide 3a fed. This happens as described above by means of the devices 1; 1 ', but in reverse Sequence.

In Fig. 6 an expedient arrangement is shown, in particular that Striking the roll core 2 during their deflection on fittings and / or to prevent guiding devices 14.

According to the devices 1; 1 'each one more functionally identical device 1 '', and assigned opposite be. This generates a counterforce that strikes the roller core 2 in prevented above described. Temporally and also in their force effect the devices 1 and 1 '' and 1 'and 1' 'are controlled so that they are do not adversely affect each other.

Moreover, it goes without saying that the devices 1 to 1 "of type according to the invention at further or other suitable locations of the Rolling line can be arranged to deflect the rolling core 2 achieve, d. H. the invention is not limited to the above Embodiment.

Claims (16)

Method of deflecting a roller core moving at high speed
characterized by
that an electromagnetic force F, caused by the flow of a current through the rolling wire (2) and a fixedly arranged current conductor (5) opposite the rolling wire (2) in approximately the same plane, is applied to the rolling wire (2) perpendicular to the rolling direction, which causes the wire core (2) to deflect away from the current conductor (5). Method according to claim 1,
characterized by
that the electrical current is transmitted to the roller core (2) without contact by means of an arc (11). Method according to one of claims 1 and 2,
characterized by
that the electromagnetic force F is defined in a predetermined wire section of the rolling core (2) and applied in a burst. Method according to one of claims 1 to 3,
characterized by
that the roller core (2) is deflected by means of such a high electromagnetic force F that the roller core (2) automatically cross-divides when it strikes a stationary shear element (12) which moves at the rolling speed in the rolling direction. Method according to one of claims 1 to 3,
characterized by
that the acting electromagnetic force F is used as a deflecting force for guiding the rolling core (2) in a direction other than the rolling direction. Method according to one of claims 1 to 5,
characterized by
that a defined electromagnetic counterforce is generated, which prevents the fittings and / or guide devices (14) of the rolling mill from striking during the deflection of the rolling core (2). Device for deflecting a rolling wire moving at high speed
characterized by
that the device (1) for deflecting a roller core (2) consists of a current conductor (5) which is arranged opposite and fixed to the roller core (2) in approximately the same plane and is provided with a contact electrode (6) and which in turn has a current source (7) , a capacitor (8) and a triggered switching spark gap (9) is connected to a further contact electrode (10) and the contact electrodes (6; 10) are at such a distance from the rolling core (2) that an arc (11) between the rolling core (2 ) and each contact electrode (6; 10) can be generated. Device according to claim 7,
characterized by
that the current conductor (5) is arranged parallel to the rolling core (2). Device according to claim 7,
characterized by
that the current conductor (5) is rectilinear, but is arranged at a defined angle to the rolling core (2). Device according to claim 7,
characterized by
that the current conductor (5) has a defined curve shape. Device according to one of claims 7 to 10,
characterized by
that the current conductor (5) can be designed differently over its length in cross section. Device according to one of claims 7 to 11,
characterized by
that the device (1) for deflecting the rolling wire (2) for generating a high-speed shear opposite in the deflection area of the rolling wire (2) is assigned a shear element (12) that the wire rod (2) in the same plane between the device (1) for Deflect and the shear element (12) can be passed. Device according to one of claims 7 to 12,
characterized by
that the shear element (12) is designed to be stationary or movable at rolling speed in the rolling direction. Device according to one of claims 12 and 13,
characterized by
that the shear element (12) is designed as an anvil with a cutting edge (13) supporting the cut. Device according to one of claims 7 to 11,
characterized by
that to generate a high-speed switch, a device (1 ') for deflecting a roller core (2), which corresponds to the device (1), is arranged in the rolling direction immediately before the deflection area from the rolling line. Device according to one of claims 7 to 15,
characterized by
that to generate a counterforce, the respective device (1; 1 ') for deflecting a roller core (2) is assigned a functionally identical device (1''), which is arranged in mirror image on the opposite side of the rolling line, for deflecting a roller core (2).

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