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

Definitions

• the invention relates to an apparatus for producing a metal strip by continuous casting, with a casting machine, in which a slab, preferably a thin slab, is poured, wherein in the conveying direction of the slab behind the casting machine at least one milling machine is arranged, in which at least one surface of the slab, preferably two opposing O- bermati, can be milled. Furthermore, the invention relates to a method for producing a metal strip.
• Continuous casting of slabs in a continuous casting plant can result in surface defects such as oscillation marks, casting powder defects or longitudinal and transverse surface cracks. These occur in conventional and thin slab casters. Depending on the intended use of the finished strip, therefore, the conventional slabs are partially flamed. Some slabs are generally flamed on customer request. The demands on the surface quality of thin slab plants are continuously increasing.
• flaming for surface treatment, flaming, grinding or milling are suitable.
• the flame has the disadvantage that the melted material can not be melted down again without treatment due to the high oxygen content.
• metal splinters mix with the grinding wheel dust, so that the abrasion must be disposed of. Both methods are difficult to adapt to the given transport speed. It therefore offers a surface treatment by milling.
• the hot milling chips are collected and can be packaged and smelted without processing without problems and thus add back to the production process.
• the cutter speed can be easily set to the transport speed (casting speed, finishing line feed speed).
• the device according to the invention of the type mentioned above therefore depends on the milling.
• a device of the type mentioned above with a milling machine, which is arranged behind a continuous casting plant is known. Reference is made to CH 584 085 and to DE 199 50 886 A1.
• a further embodiment of a surface milling machine is shown in DE 197 17 200 A1.
• the inline milling machine is generally not used for all products of a rolling program, but only for those where higher surface requirements are required. This is advantageous for application reasons and reduces the Fräsmaschinenabpart and is therefore useful.
• the inline milling machine requires installation space. Disturbing is the slab temperature loss in the area of the machine. This applies to the use of the caster, since the casting speed (mass flow) is usually low. But even before the finishing train, the temperature loss is disadvantageous because, especially with thinner strip, a high final rolling temperature is aimed at at an acceptable strip outlet speed from the finishing train.
• the present invention is therefore based on the object to improve an apparatus and a method for producing a metal strip by continuous casting using a milling machine so that an optimal slab processing is possible even with different procedural requirements.
• temperature losses during slab processing or - processing should be kept low.
• the solution of this problem by the invention is characterized in that at least one cutter of the milling machine, preferably the entire milling machine, is arranged displaceably in a direction transverse to the conveying direction of the slab.
• the thermal balance of the system can thus be optimized, as will be seen in more detail.
• the direction transverse to the conveying direction is preferably oriented horizontally.
• At least one cover element with a thermally insulating property can be provided, which is arranged displaceably in the direction transverse to the conveying direction.
• the thermally insulating material is preferably heat-stable.
• a thicker sheet or plate of refractory non-metallic material may already serve the purpose.
• the at least one cover is formed heatable.
• the cover has the function of a furnace.
• a furnace In the conveying direction before the milling machine, a furnace may be arranged.
• a cutter For the processing of the top and the bottom of the slab, a cutter can be arranged in each case. It is preferably provided that the two cutters are arranged spaced apart in the conveying direction. Furthermore, it has proven useful if each cutter interacts with a support roller arranged on the other side of the slab.
• An oven can be arranged between the two cutters which process the upper side or the lower side of the slab.
• a descaling system In the conveying direction behind the milling machine, a descaling system can be arranged. It can be provided that between the milling machine and the Entzu matterssstrom a furnace is arranged.
• An alternative embodiment of the invention provides that a descaling system is arranged at the same height in the conveying direction next to the milling machine, wherein the milling machine and the descaling system select way by moving means in the direction transverse to the conveying direction in the processing line or can be extended.
• the milling machine can be divided into two sub-machines, the distance from each other, for example, milling different sides of the slab.
• milling machine or parts thereof are integrated in a Entzu matterssstrom, which allows a compact structure.
• the method for operating a device for producing a metal strip by continuous casting is characterized in that it is decided by means of a running in a machine control in dependence of determined or predetermined surface properties of the slab, whether a use of the milling machine before rolling the slab or not.
• the simulation model is preferably a process model or a so-called level-3 system, which is known as such in the prior art.
• 1a is a schematic side view of an apparatus for producing a metal strip by continuous casting, in which a milling machine can be used,
• FIG. 1 b shows the top view associated with FIG. 1 a of the device
• FIG. 2a shows an alternative to Fig. 1a apparatus for producing a metal strip in side view
• FIG. 2b shows the plan view of the device associated with FIG. 2a, FIG.
• FIG. 3 shows schematically a milling machine similar to FIG. 1 in an enlarged view and with indicated insulation elements
• FIG. 4 shows a further side view of an alternative device to FIG. 1a, wherein the milling units are arranged at a distance from one another and mill different sides of the slab;
• Fig. 5 is an alternative to Fig. 4 device in side view and
• Fig. 6 is another to Fig. 1a alternative device in side view with an oven between the milling machine and the rolling train.
• Fig. 1a and 1 b an apparatus for producing a metal strip 1 is shown by continuous casting.
• the metal strip 1 or the corresponding slab 3 is continuously cast in a casting machine 2 in a known manner.
• the slab 3 is preferably a thin slab.
• the slab 3 is subjected to a slab cleaning in a cleaning system 15. This is followed by a surface inspection by means of a surface measuring device 16.
• the slab 3 enters an oven 8, so that it can be kept at a desired process temperature.
• the oven is followed by a ferry 17.
• the slab 3 enters a milling machine 4.
• this present - in the conveying direction F slightly spaced - two cutters 5 and 6 are arranged, with which the lower and the upper surface of the slab 3 are milled can.
• the respective opposite surface of the slab 3, d. H. the top and the bottom thereof is supported by support rollers 9.
• a collecting container 18 is collected in the milled material.
• the milling machine 4 can thus be positioned in a first position (shown with solid lines), in which it is retracted into the processing line and the slab 3 can mill. But it can also be arranged in a second position (shown with dashed lines), in which it is not used.
• a cover element 7 (see Fig. 1 b) is retracted into the processing line simultaneously with the removal of the milling machine 4 from the processing line, which is designed thermally insulating and thus prevents that the slab cools too much.
• the cover member 7 may also be formed as a furnace part, d. H. it can be heated.
• the unit consisting of milling machine 4 and cover element 7 can be moved simultaneously in the direction Q transverse to the conveying direction F.
• Fig. 2a and Fig. 2b an alternative solution is outlined.
• at least one upper descaling unit 11 ' is provided, which is then disengaged when the milling machine 4 has moved into the processing position.
• the descaling unit 11 ' is then in introduced the processing line when the milling machine 4 is disengaged by movement in the direction Q.
• the entire Entzu matterssstrom 11 can thus be swung out of the processing line or lifted to be replaced by the milling machine 4 and vice versa.
• a preferred embodiment provides that the Entzu matterssstrom 11 and the milling machine 4 are arranged one above the other and if necessary, the desired unit in the rolling line (processing line) is lifted or moved.
• Fig. 3 is again in detail, but only schematically indicated how the system can be constructed.
• a cutter 5 and 6 is arranged and a corresponding support roller 9 in order to mill the passing in the conveying direction F slab 3 on the top and bottom.
• cover elements 7 'with a thermally good insulating property can be arranged in a stationary manner next to the uprights 19, it is provided that the elements 9 and 6 (supporting roller and milling cutter) shown above the slab 3 on the one hand and the cover elements 7 on the other hand are arranged selectively and alternatively can. If the upper support roller 9 and the milling cutter 6 are thus in operation, the cover elements 7 are not in the position shown. Accordingly, in the case where the support members 7 are positioned as shown, the upper support roller 9 and the cutter 6 are brought out of position.
• the support roller 9 and the cutter 5 are exchangeable by the cover elements 7 and roller table rollers 22.
• FIG. 1 and Fig. 2 further alternative embodiment of the invention according to
• the milling machine 4 is divided into two sub-machines 4 'and 4 ".
• the upper side of the slab 3 is milled in the first milling machine 4' in the conveying direction F.
• the milling machine 4" mills the underside. from the bottom of the slab 3.
• an oven 10 is arranged between the two milling machines 4 ', 4 ".
• FIG. 5 provides that in the second milling machine 4 "Entzu mattersdüsenbalken 21 are integrated to make space-saving descaling combined with the milling can.
• a further alternative embodiment of the invention according to FIG. 6 provides that an oven 12 is arranged between the milling machine 4 and the descaling system 11. It can thus be achieved that, after milling, the slab 3 is held or brought to a desired optimum process temperature.
• the proposed in-line milling device 4, 4 ', 4 " can therefore be adjusted to the application and has the task of optimizing the temperature control as optimally as possible at high temperature for the subsequent rolling process or with a low temperature loss. 4 "is this pushed depending on the application only when needed in the rolling or transport line or is arranged so that a minimal temperature loss arises.
• the illustrated Figures 1 and 2 show the advantageous arrangement of milling machine, furnace and scale washer before a finishing train and the possibilities of adaptation.
• the rear part of the furnace or roller shutter enclosure is designed to be transversely displaceable so that a furnace segment or the inline milling machine can stand in the rolling line.
• the area of the milling machine can alternatively be designed with a passive roller table cover (insulation) and thus the temperature loss in the area of the milling machine can be reduced, as shown in FIG.
• insulation passive roller table cover
• the milling unit can be integrated at the bottom in the scale scrubber, as shown in FIG. 5.
• a milling machine behind the furnace at the bottom eliminates not only the casting defects, but also any damage to the slab surface by the furnace rollers.
• the surface treatment on both sides or only on the top in front of the furnace would also be conceivable, but is twice as expensive in a 2-strand plant.
• a favorable arrangement of the milling machine 4 with respect to the temperature control is also to place the entire milling machine 4 (milling from above and from below) behind the ferry 17 (in the middle of the furnace area), as shown in FIG.
• the temperature losses in the field of milling machine 4 can be compensated in an advantageous manner in the rear oven part again.
• an inductive heating system can also be installed behind the milling machine.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metal Rolling (AREA)
• Milling Processes (AREA)
• Continuous Casting (AREA)

Applications Claiming Priority (3)

Publications (1)

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ID=38438668

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• 2007
  • 2007-05-14 DE DE102007022927A patent/DE102007022927A1/de not_active Withdrawn
  • 2007-05-22 TW TW096118118A patent/TW200819222A/zh unknown
  • 2007-05-23 CA CA2651766A patent/CA2651766C/en not_active Expired - Fee Related
  • 2007-05-23 MX MX2008015084A patent/MX2008015084A/es not_active Application Discontinuation
  • 2007-05-23 EP EP07725498A patent/EP2032288A1/de not_active Withdrawn
  • 2007-05-23 US US12/227,556 patent/US20090139681A1/en not_active Abandoned
  • 2007-05-23 AU AU2007267415A patent/AU2007267415B2/en not_active Ceased
  • 2007-05-23 WO PCT/EP2007/004598 patent/WO2007137759A1/de active Application Filing
  • 2007-05-23 RU RU2008151765/02A patent/RU2404016C2/ru not_active IP Right Cessation
  • 2007-05-23 KR KR1020087027668A patent/KR101060123B1/ko not_active IP Right Cessation
  • 2007-05-23 BR BRPI0712475-9A patent/BRPI0712475A2/pt not_active IP Right Cessation
  • 2007-05-23 JP JP2009511406A patent/JP4880752B2/ja not_active Expired - Fee Related
  • 2007-05-24 AR ARP070102272A patent/AR061188A1/es unknown
• 2008
  • 2008-11-04 EG EG2008111806A patent/EG24982A/xx active

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