Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/12—Accessories for subsequent treating or working cast stock in situ
  • B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/16—Controlling or regulating processes or operations
  • B22D11/163—Controlling or regulating processes or operations for cutting cast stock

Definitions

• the invention relates to a method for operating a continuous casting system with a flame cutting machine for separating continuous cast pieces, in which measurement data, such as strand width, strand thickness and speed changes, are recorded and evaluated in a computing and control unit in order for the strand to be divided as loss-free as possible.
• the invention is therefore based on the object of producing continuous castings which have an exact value in terms of their amount of material, as used for the subsequent processing, e.g. when rolling out sheets.
• the solution to this problem according to the invention consists in that, in order to achieve a specific mass value or weight in the separated workpiece, the casting temperature, homogeneity over the running strand length, strand surface defects and specific material weight are determined and for cutting off a workpiece with a length that corresponds exactly or almost to a specific workpiece weight , are entered into the flame cutting machine itself.
• DE-OS 1932834 discloses a strand cutting machine with a track arranged parallel to the strand, on which the machine can be moved by means of a machine carriage and a follower device for hydraulic, pneumatic or motorized clamping and unclamping, as well as a multiple measuring device for determining the measurement data, such as strand width, strand thickness and casting speed changes for input into a computing and control device.
• the invention proposes that the multiple measuring device be provided on the flame cutting machine and that the casting temperature, the homogeneity over the running strand length, the strand surface defects and the specific material weight are recorded in order to achieve a certain mass value or weight for the separated workpiece.
• a further development of the invention is that the computing and control device is used to adjust the size of the casting mold.
• the computing and control device serves to control the deformation of the strand support rollers in the rolling stand under cooling conditions to reduce the convex and concave strand deformations.
• the computing and control unit advantageously sends out warning signals in order, for example, to initiate the replacement of the mold or the rollers during a subsequent repair.
• An advantageous embodiment of the invention is characterized in that marking devices are provided which are used for stamping and labeling on the top or front surface of the strand, for marking future strand pieces while passing by at the casting speed, for marking future strand pieces with a casting speed which results from the casting speed or Engine speed results or allows a combined marking.
• a scale removal device which removes the scale for marking or error removal, has a flame device for eliminating selection errors, and a device for detecting the weight of the material to be removed.
• flame cutting machine for cutting workpieces from the casting strand is to be understood to mean the entire flame cutting machine system with the conventional support structures, rails and other parts for travel movements, supply devices as well as the multiple measuring device, which includes a computing and control device, a marking device, a scale removal device and an error detection device is provided.
• the multiple measuring device goes far beyond the previous devices for piece length measurement. Above all, the width and the thickness of the workpiece are measured, so that the specific weight makes it possible to determine the weight of the workpiece to be cut.
• the multiple measuring device is designed such that scanning operations take place at several points with respect to the width and thickness of the workpiece, as well as from both sides, i.e. to the right and left of the casting strand and above and below to detect the exact shape of the workpiece, in particular any concave or convex shape.
• the measurement of the strand width can be carried out by pulse generators, which are firmly connected to the pinion and rack drive on burner transverse travel drives, and a pulse counter to measure the distances from predetermined ones and to determine repeatable zero points up to the two strand edges.
• Edge sensors are installed between the control of the torch travel and the cutting cycles so that the actual width of the strand can be measured for further processing and creation of correction factors or signals.
• pulse generators on the clip-on arm system for pincer-like connection to the string sides and to provide a pulse counter, the distances from the predetermined and repeatable, fully open zero positions to the clamped string sides being measured by touch, so that the actual string width for further processing can be passed on for the creation of correction factors or signals.
• Another option is to install pulse generators with pulse counters on two specially installed probe rod systems, which can be moved from specific and repeatable zero starting positions to contact on the strand sides at appropriate times and thus the actual strand width for further processing to create correction factors and give signals.
• the strand thickness measuring device with which the multiple measuring device of the flame cutting machine is provided, consists either of a pulse counter and a pulse generator, which meshes with a pinion in a toothed rack, which either from a predetermined and repeatable zero position with the machine parts to be placed on the strand for synchronization with the strand and to the flame cutting machine down to the point of contact when it is placed on the strand, and thus the actual thickness of the strand that is supported on a roller table or the like that has a certain level, as well as the flame cutting machine that is on rails with a certain level moves, for further processing for the creation of correction factors or signals, whereby signals are given for the further processing for the creation of correction factors, or a pulse counter and pulse generator is built in, which is driven by a swinging downward, with compressed air A clamping arm is moved to synchronize the friction of the flame cutting machine with the upper strand surface, which indicates the actual strand thickness for further processing and creation of correction factors and / or signals.
• a pulse counter and a pulse generator on a special height probe rod, which moves from a predetermined and repeatable zero position on the appropriate occasion until the strand surface is touched. This determines the actual strand thickness for processing and creating correction factors and / or signals.
• a pulse counter with a pulse generator can also be provided on the burner height adjustment buttons, with predetermined, repeatable zero positions for moving the burner downwards for the appropriate nozzle spacing after scanning the exact strand surface. This determines the actual strand thickness for further processing to create correction factors and signals.
• a pulse counter and a pulse generator can also be provided on a lever or slide in a slide guide on or in the area of the flame cutting machine. For length measurement, a measuring roller moves down from a certain and repeatable zero position, and another button is lowered onto the strand surface, thus determining the actual strand thickness for further processing and for setting correction factors and / or signals.
• two or more thickness measurement devices can be provided, which work against the lower strand surface from bottom to top.
• Existing devices or special drives and feeler mechanisms with pulse generators are used to create the thickness measurement results more precisely by forming the difference against the surface-measuring pulse measurement and counting device.
• the multiple measuring device also includes a temperature measuring device.
• thermometer installed inside or on parts that touch the strand for synchronous operation. Wear plates of the clamping arms or ride-on runners are to be mentioned here, from which temperature measurements can be carried out at certain times, i.e. especially for a correction shortly before determining the length of the next workpiece. For this purpose, appropriate signals are entered into the length measuring device.
• the multiple measuring device also includes devices for measuring the line speed. These are equipped with a pulse speed counter to determine the number of pulses emanating from the usual length measuring device, which is driven by a strand with a measuring wheel by friction and rotates a pulse generator. Within a predetermined time, e.g. 1 minute, the pulses are counted and the actual strand speed in the vicinity of the strand cutting machine is measured in order to process this speed in comparison with empirically determined correction factors or speed ratios and to forward improved correction factors to the length measuring device or to other points in the continuous casting installation.
• the multiple measuring device consists of a plurality of measuring devices, the most important of which have been explained, i.e. if the need to collect special data arises, the multimeter can be expanded accordingly.
• the multiple measuring device is assigned a computing and control device which processes the measured values obtained and transmits corresponding signals not only for the operation of the continuous cutting machine, but also for the entire continuous casting installation.
• appropriate connections and circuits are provided so that, for example, the size of the casting mold can be set on the basis of the signals obtained and emitted or the deforming position of the strand support or transport rollers in the rolling stand of the casting system can be set.
• Warning signals can also be emitted by the computing and control device of the flame cutting machine in order to indicate, if necessary, the need to replace the mold and the roller in the event of a future repair.
• a marking device is further provided on the flame cutting machine for stamping or labeling or signals to be applied in some other way in the form of letters and / or numbers on the top or front surfaces of the strand.
• This marking takes place with the movement of the flame cutting machine during cutting during the synchronous operation or with a device attached to the flame cutting machine, which can also be arranged directly in its vicinity.
• the future strand pieces are marked while the strand passes at the casting speed, or with the aid of a device attached to the flame cutting machine, the future strand piece passing at a speed that results from the casting speed and the flame cutting speed while the flame cutting machine is standing and back in the starting or starting position is running.
• the line speed pulse generator or counter is used to calculate the necessary relative speed, which corresponds to the marking speed.
• All of this data which is applied to the strand with the use of a one-, two- or multi-line marking, is used to control the operation of the continuous casting system or flame cutting machine, by using data or corresponding signals which relate to the material composition, the cutting temperature of the material used, the underlying cross-section and workpiece shape, originally requested piece length and other more. So it is possible, including more information, such as. B. the strand piece weight measurement, to determine the final, cold length or to regulate a statistical system for the end result of long-term optimization.
• a scale removal device is also used for the proper operation of a flame cutting machine with the devices described above. It is used for perfect marking, better error detection and better measurement. It preferably consists of a high-performance heating burner for melting and blowing away the scale in front of and in the area of the marking, preferably on the side surfaces. By removing the scale, a clean and reliable marking result is guaranteed, which at least up to the entry of the strand piece conveys the necessary information into the reheating furnaces. But also in the area of measuring probes or sensors, it is important that scale is removed in order to ensure an accurate temperature, thickness, width or shape measurement.
• the scale removal device can be provided with a flame burner in order to clean parts of the outer sides or surfaces for fault finding and to carry out selection error elimination by means of flames.
• the weight of the removed material is to be entered into the computing and control device by measuring and calculating the length, width and depth of flame paths in order to determine a piece length correction factor for optimization.
• the return speed of the flame cutting machine is predetermined in order to determine, together with the continuous casting speed, a relative speed which corresponds to the flame speed.
• a fault location device which is also located on the flame cutting machine, is used for in-line testing of hot, warm and cold strand surfaces by means of optical, induction heat or eddy current devices.
• the device works at casting speed, internal combustion engine travel speed or corresponding relative speeds.
• Correction factors are obtained by the error detection device, which are related to the size of the error, which influences the piece length measurement.
• an optimizing continuous cutting machine is made available which, with its facilities, enables a continuous casting plant to be operated under optimal operating conditions. Above all, the necessary tolerances when cutting workpieces are significantly reduced, which means that the production or output of the continuous casting plant is optimized. It is possible to cut a workpiece in a desired length in such a way that it corresponds exactly or almost to a certain workpiece weight.
• An unmistakable strand piece identification enables quality control and quality improvement, especially for the recommended energy-saving use of hot strand pieces in pusher furnaces.
• the strand flame cutting machine together with conventional piece measuring devices for delivering the start of cutting is the first device which is not used to produce a continuous strand, but rather to produce strand pieces.
• the strand flame cutting machine together with conventional piece measuring devices for delivering the start of cutting is the first device which is not used to produce a continuous strand, but rather to produce strand pieces.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Continuous Casting (AREA)
• Moulding By Coating Moulds (AREA)

Priority Applications (5)

Applications Claiming Priority (1)

Publications (2)

Family

ID=8193377

Family Applications (1)

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• 1985
  • 1985-03-16 AT AT85103051T patent/ATE44350T1/de not_active IP Right Cessation
  • 1985-03-16 DE DE8585103051T patent/DE3571303D1/de not_active Expired
  • 1985-03-16 EP EP85103051A patent/EP0195095B1/de not_active Expired
• 1986
  • 1986-02-28 US US06/834,618 patent/US4735399A/en not_active Expired - Fee Related
  • 1986-03-17 JP JP61057174A patent/JPS61212461A/ja active Granted

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