DE2919898A1 - Flame cutting of continuously cast slabs - where path travelled by cutting machine can be increased, esp. for removing scrap front end of slab - Google Patents

Abstract

Parent patent described the use of a flame cutting machine moving at the same speed as a slab. The speed of a burner travelling across the slab is synchronised with the casting speed so that e.g. the burner does not damage the roller track conveying the slab. The burner can be driven across the slab while the latter moves along a path which has an increased length. The pref. plant includes electronic appts. controlling the movements of the cutting machine and feeding signals to a visual display indicator, but manual adjustment of the burner is also possible. The system is readily adapted to changes in output rate etc. from the casting plant.

Description

Process and system for flame cutting of

Slabs at a continuous caster The invention relates to a method and a system for flame cutting that is suitable for carrying out the method of steel slabs or the like on continuous casting plants in which the flame cutting machine runs along with the casting speed of the strand during the flame cutting, wherein according to patent (patent application P 28 13 461.4) it is provided that the BrennschneidgeschtlJindigkeit the casting speed, also taking into account any short-term delays is automatically adjusted in the cutting sequence so that until the end of the flame cut a certain, specified Nitlauf distance is adhered to.

The plant proposed in the main patent for implementation of the existing control device is in able that Always control the cutting speed so that for all possible slab cross-sections as well as materials of the separating cut always after covering the same traveling distance is finished. This control device can automatically set a predetermined flame cutting path pretend that runs so that the strand supporting roles are not lowered Need to become.

Now, in continuous casting, there is also the normal separation process of Slabs from the moving cast strand through the rotating torch cutting machine still other operational processes, for example the so-called cropping, in which the front cropping piece of the strand over a crop removal device or a Bucket must be separated. This is the place for the bucket to be set up or the like. This can have an adverse effect on business operations and / or the structural design of the entire continuous caster.

The invention is based on the object, the method and the System of the type mentioned in such a way that over the normal In addition to cutting operations, flexible adaptation to special operating processes or

Requirements is necessary that arise when flame cutting on continuous casting plants can result.

On the process side, this object is achieved in that by an additional delay that deviates from the specified tracking route, changed idle run is stopped that is longer than the specified follow run and in the course of which roles that support the strand are bypassed.

In this way, the tracking route can be extended as required will. So the skip can now be moved to the end of the roller table, where the separated crop sections are easier and without disturbing the slab processing have it transported away.

A flexible extension of the follow-up route is also an example when burner malfunctions occur, this is advantageous because burner malfunctions affect them Way can be eliminated without interrupting the normal operating rhythm.

To then after covering such an extended follow-up route immediately back to the normal slab separation in the course of the specified traveling distance to be able to return is provided according to a further development of the inventive concept, that when flame cutting on a predetermined follow-up route after the preceding Carrying out a cutting process in the course of a #eanerten longer Follow-up path of the cutting torch around one of the desired length of one to be cut off Slab driven back the corresponding route, attached to the strand and attached to the reached attachment point on the moving strand in cutting activity is set, even if this attachment point is the normal flame cutting starting position has already happened.

Provision is preferably made for one consisting of the following steps Cycle: flame cutting on a given follow-up distance - retraction - start - Immediate start of cutting - to be repeated until the attachment point with the matches the normal cutting torch starting position again. This process can are referred to as "seal back."

It can also be advantageous to track the cutting torch position and to be displayed continuously. This can be particularly advantageous when the burner position corrected or controlled manually. A manual burner control can in particular be advantageous in case of burner malfunctions or the like, if used in one Automatic control system or the like no suitable program is pre-stored.

For the system for carrying out the method mentioned at the beginning the object is achieved in that the control device is the cutting torch delayed in such a way that it is on a route deviating from the normal tracking route, changed tracking distance is moved longer than the specified, normal tracking distance is and runs in such a way that the strand supporting roles are bypassed.

The control device can automatically select any desired cutting path by bypassing existing roles.

For better monitoring of the system it is provided that the cutting torch a position transmitter is assigned, which determines the current burner position and reports.

The burner position thus determined can advantageously be on a Display device are displayed visually.

This display device can provide a flow chart representation of the entire Contained continuous casting process or a part thereof. On this flow chart presentation can determine the essential contours of the cast strand and the position of the cutting torch are represented by individually controlled light sources that are correspondingly bright or be controlled dark.

These light sources can be formed by light emitting diodes shown in different colors are available inexpensively and are operated in an energy-saving manner can.

It can also be advantageous to display the cutting torch position in a color and / or light characteristic that deviates from the line position representation displayed, for example by rhythmic flashing.

When the cast strand or the cutting process from the display device can be seen, it may be sufficient to just turn the cutting torch on the display device.

According to another development of the inventive concept, it is provided set up a manual control device, preferably near the display device, with which the cutting torch, at least in special cases, such as can be performed manually in the event of burner malfunctions.

The invention is described below on the basis of a preferred exemplary embodiment explained in more detail in connection with a drawing. 1 shows a plan view on a cast strand supported by a roller table with a schematic representation different flame cutting paths, as they are with the help of the flame cutting system according to the invention can be produced; 2 shows a partial plan view of one assigned to the flame cutting system Display device; Fig. 3 is a graphical representation of a flame cutting process designated as tt return seals "and FIG. 4 shows a schematic Block diagram of the display device in connection with a control device the flame cutting machine.

The main patent ... t ............. (patent application P 28 13 461.4) in the local Fig. 6 shown control.

device corresponds to that in the attached Fig. 4 schematically control device 100 shown. It controls the cutting speed designated by V5 of a cutting torch 70 in relation to that running in the direction of the arrow in FIG Casting speed Vg of the cast strand 10 in such a way that the burner at normal Burning off a slab of the desired length from the cast strand 10 a in Fig. 1 normal flame cutting path 60 n, shown double-dot-dash.

This normal flame cutting path 60 n begins with one in FIG. 1 A denotes the normal cutting torch starting position and it ends at a with Zn designated target position after the cutting torch 70 with the moving Cast strand 10 has traveled along a normal follow-up path, denoted by x.

In addition to the normal severing of slabs from the cast strand 10 in the continuous casting operation still other BetriebsablciuÎe before, for example the so-called Schopien, in which an unusable head piece 11 only at the moment severed is to be, in which it is located exactly above a crop removal device, which is formed by a bucket 18 in the present case. This bucket is for operational reasons.

behind the normal Nitlauf section x, for example at the very end of the roller table.

In Fig. 1 is the flame cutting path predetermined by the control device 100 for the cropping process with 60 s bezeiclinot and, if already stated, as continuous line is drawn. The cutting torch 70 takes the one shown in FIG Position one after he has the cutting kerf labeled 72 already about two Third has finished as soon as the cutting torch 70 continues on the interrupted drawing Flame cutting path has reached a cropping target position Zs, the cropping piece becomes 11 in the bucket 18 between adjacent, disc-shaped rollers 12, the are mounted on axles 14, fall.

The cutting path 60s covered during cropping also avoids like the normal flame cutting path 60n, the passing over of existing rollers 12.

A special torch cutting track similar to the extended Brennschned track 60s can, for example, when a Burner malfunction or the like to be required. Such a special flame cutting path is either automatic predetermined by the control device 100, or it can if necessary by means of a Manual control device 121 at a control stand 120 manually into the control device 100 must be entered. Thus, the cutting torch 70 can not only be used in automatic mode, but also manually with an adapted cutting speed Vs to a desired one Guide cutting path 60s.

2 shows an exemplary embodiment for a display device according to the invention, with which a running cutting torch position designated by 52 is in relation can be followed at any time to a current position of the strand 10.

As can be seen from the block diagram of FIG. 4, the current position of the strand 10 by a position transmitter 112, and the position of the cutting torch 70 scanned by a position encoder 114 and in the form of corresponding Signals fed into the display device 110.

The latter is designed as a flow chart display and has a large one Number of display points 50 arranged like a matrix in the form of individually controllable, provided point-shaped light sources, for example in the form of light emitting diodes, which Can be installed to save space and operated in an energy-saving manner. In Fig. 2 are idle, d.1i. Im illuminated display points with 50, and activated or illuminated display points are designated by 50 '. On the front panel the Display device 110 are details such as rollers 12, 14, the roller table, the Bucket 18 and the like as well as the direction of advance of the strand 10 graphically shown. The contour of the cast strand 10 is indicated by the illuminated display points 501 continuously forms, and the cutting torch position 52 is for example by a different luminous color and / or, for example, by rhythmic flashing of the relevant display pointE is particularly highlighted.

If from the control station 120 indicated schematically in FIG. 4 the entire continuous caster can be viewed exactly, can optionally on a Positional representation of the cast strand on the display device 110 is dispensed with when the representation of the cutting torch position 52 for monitoring and control the system is sufficient. In this case, the display device is significantly simplified, A position encoder 112 for the line can then also be dispensed with, If the cutting machine is used, for example, with the previously described crops, in the event of a torch malfunction or for other reasons, the cutting torch 70 on a extended Brennschneidbalrn 60s according to FIG. 1 or the like in a transport direction behind the normal target position Zn (Fig * 1) has moved target position, for example after Zs over the bucket 18, then it is to separate the next slab from the Cast strand 10 is no longer possible, the cutting torch 70 in the normal cutting torch starting position A. to retract, because namely the one for the removal: '# - nen a desired slab length required starting point has already passed this starting position A. Vieffi the burner must now be at an initial position designated by A1 in FIG. 3 attached to the strand5 which corresponds to the desired length of the slab, which is the next to be separated from the cast strand 10. The normal separating cut that begins there is denoted by S1 in FIG. 3, becomes in the course of a normal follow-up route carried out and ends at a Z 'designated target point between the normal target point Zn and the target point Zs reached during cropping.

If also the normal one the next time the cutting torch is retracted Starting position A cannot yet be reached again, if an A " designated starting position and the next slab again by means of a normal severing cut S2, which ends in a target position Z. According to 4 the cutting torch only then reaches the normal cutting torch starting position A, so that the third and all subsequent normal separating cuts SD, S4 again can be carried out as usual in the course of the normal flame cutting path 60n (FIG. 1) can.

This cyclical return process after an extended Separation cut can be described as "seal back".

With a trained according to the embodiment described above Flame cutting system with control device 100 can have one or more cutting torches an'Brennschneidmaschine in the course of each desired or the respective operating requirements adapted flame cutting path automatically or by hand.

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Claims (16)

Process and system for flame cutting slabs on a continuous caster (Addition to patent ~ .............) (Application P 28 13 461.4) Patent claims: 1. Process for flame cutting of steel slabs or the like on continuous casting plants, in which the flame cutting machine during the casting speed of the strand of the flame cutting runs, in which according to the main patent ............. (Patent application P 28 13 461.4) is provided that the cutting speed the casting speed, also taking into account any short-term delays is automatically adjusted in the cutting sequence so that until the end of the flame cut a certain predetermined follow-up distance is maintained, d a d u r c Ii g e k E nn z i c h e t that by an additional delay one of the specified Nitlaufbahn different, modified follow-up route adhered to which is longer than the specified run-out distance and in the course of which rolls, that support the strand are bypassed. 2. The method according to claim 1, characterized in that the flame cutting on a specified follow-up route after a cutting process has been carried out in the course of a modified longer run-out distance of the cutting torch to one of the the desired length of a slab to be cut is retracted, attached to the strand and at the attachment point reached on the moving one Strand is put into cutting activity, even if this attachment point is the normal Has already passed the flame cutting starting position. 3. The method according to claim 2, characterized in that one off following steps of the existing cycle: flame cutting on a specified tracking path - move back - start cutting - start cutting immediately - as long as it is repeated, until the attachment point corresponds to the normal cutting torch starting position. 4. The method according to any one of claims 1 to 3, characterized in that that the cutting torch position is tracked and continuously displayed. 5. The method according to claim 4, characterized in that the burner position corrected or controlled manually. 6. Plant for performing the method according to one of the claims 1 to 5 with a flame cutting machine that is used for the duration of the severing of a specified flame cutting path with the casting speed in the direction of the strand feed runs along, whereby according to the main patent .................... (patent application P 28 13 461.4) it is provided that a control device controls the cutting speed so that the separation process with changing casting speed also taking into account any short-term delays in the cutting process after completing a certain Follow-up path is ended, that is, the control device (ion) the cutting torch (70) delayed in such a way that it is on one of the normal runoff distance (x) deviating, modified Follow-up route (A-Zs) is moved, which is longer than the specified normal tracking distance (x) and runs so that the strand (10) supporting roles (.12) are bypassed. 7. Plant according to claim 6, d a d u r c h g e k e n n z e i c h n e t that the control device (100) the cutting torch (70) when executing a Flame cutting process (S1) according to a new predetermined normal follow-up distance (x) prior to running through a modified, longer follow-up route (A - Zs) by one moves back the distance corresponding to the desired slab length, starts on the strand, starts the cutting process at the attachment point reached, even if this point on the moving cast strand the normal cutting torch starting position (A) has already happened. 8. Plant according to claim 6, d a d u r c h g e k e n n z e i c h n e t that the cutting torch (70) is assigned a position encoder (114), which determines and reports the current burner position. 9. Plant according to claim 8, characterized in that the current Burner position (52) is shown visually on a display device (110). 10. Plant according to claim 9, d a d u r c h g e k e n n z e i c h n e t that on the display device (110) further elements (see above) for visual representation of position data of the cast strand (10) are arranged. 11. Plant according to claim 10, d a d u r c h g e k e n n z e i c h n e t that the elements (see above) to represent the position of the cast strand (10) through The position transmitter (112) tracking the current position of the strand is activated will. 12. Plant according to claim 9 or 11, characterized in that the Display elements (50) for the burner and strand positions from the display device (110) distributed, separately controllable light sources. 13. Plant according to claim 12, characterized in that the light sources (see above) are at least partially formed by light-emitting diodes. 14. Plant according to claim 12 or 13, characterized in that for Position representation of the cutting torch (70) one of the strand position representation different light color and / or light characteristics are used. 15. Plant according to claim 14, characterized in that the burner position (52) is represented by a rhythmically flashing light display. 16. System according to claim 6, characterized by a manual control device (121) for manually guiding the cutting torch (70).