EP2531624B1 - Vorrichtung und verfahren zum wärmebehandeln von stahldrähten - Google Patents

Vorrichtung und verfahren zum wärmebehandeln von stahldrähten Download PDF

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Publication number
EP2531624B1
EP2531624B1 EP11702388.7A EP11702388A EP2531624B1 EP 2531624 B1 EP2531624 B1 EP 2531624B1 EP 11702388 A EP11702388 A EP 11702388A EP 2531624 B1 EP2531624 B1 EP 2531624B1
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EP
European Patent Office
Prior art keywords
oven
shaft
furnace
water bath
sections
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP11702388.7A
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German (de)
English (en)
French (fr)
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EP2531624A1 (de
Inventor
Gerhard Barta
Hans-Peter Pichler
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Steinklauber Industriebeteiligung & Vermoegensverw
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Steinklauber Industriebeteiligung & Vermogensverwaltung GmbH
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Publication of EP2531624A1 publication Critical patent/EP2531624A1/de
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C21D9/5732—Continuous furnaces for strip or wire with cooling of wires; of rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/28—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity for treating continuous lengths of work
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types

Definitions

  • the invention relates to a furnace for heat treating at least one elongated, in particular metallic object such as one or more wires, in particular steel wires, in a continuous process, comprising a furnace inlet and a furnace outlet and one or more furnace sections which extend between the furnace inlet and the furnace outlet and form a first shaft , wherein in the furnace, in particular in the first shaft, one or more heating elements are arranged for setting a temperature in the one or more furnace sections, and wherein the elongated, in particular metallic object can be transported along the first shaft, at least a second one with the first shaft connected shaft and at least one fan is provided with which an atmosphere in the furnace can be circulated in a circuit along the first shaft and the second shaft.
  • a furnace for heat treating at least one elongated, in particular metallic object such as one or more wires, in particular steel wires, in a continuous process
  • a furnace inlet and a furnace outlet and one or more furnace sections which extend between the furnace inlet and the furnace outlet and form a first shaft ,
  • the invention relates to a device with such an oven and a module for the heat treatment of at least one elongated, in particular metallic object such as one or more wires, in particular steel wires, in a continuous process, the module having a module inlet and a module outlet and in between a water bath and subsequently has a stop section with one or more heating devices.
  • the invention relates to a process for the heat treatment of at least one elongated metallic object, such as one or more wires, in particular steel wires, in a continuous process, the metallic object being passed through an oven and an adjoining module with a water bath and a holding section in order to ensure a structure of the adjust metallic object, wherein an atmosphere in the furnace (1) is continuously circulated in a circuit.
  • elongated metallic object such as one or more wires, in particular steel wires
  • continuous process means that the at least one elongated metallic object, for example a metallic wire such as a steel wire or a metallic strip such as a steel strip, is drawn off from an unwinding device and by a device for Heat treatment is performed.
  • a device for Heat treatment it can be intended, in particular, that the elongated metallic object to be treated is transferred into a structure that is possibly particularly suitable for further processing.
  • steel wires for example, it is known to carry out a heat treatment in order to obtain steel wires with a pearlitic structure, in particular for high-carbon steel wires with a carbon content of approximately more than 0.5 to 1.0 percent by weight.
  • a steel wire is first passed through a furnace for austenitizing the steel wire and then quenched in a module separate from the furnace to a temperature in the region of the pearlite nose of the structure before the steel wire is kept at a temperature of about 550 ° C. to convert the Structure in perlite without ensuring the formation of martensite ( EP 0 524 689 A1 or EP 0 216 434 A1 ).
  • GB 491 052 A discloses an oven with a subsequent water bath for the heat treatment of long metal products.
  • BE 834 316 A1 discloses a furnace for the heat treatment of long metal products, in which an atmosphere is circulated through an upper shaft and into a lower shaft.
  • Furnaces for the austenitization of a steel wire generally have a plurality of heating elements, for example in the form of gas burners, with which a wire, in particular steel wire, and optionally also a plurality of bundles of steel wires guided in parallel, are heated to or above an austenitization temperature, so that a subsequent setting of the Structure can be done in the manner described above.
  • a heating element for example in the form of gas burners, with which a wire, in particular steel wire, and optionally also a plurality of bundles of steel wires guided in parallel, are heated to or above an austenitization temperature, so that a subsequent setting of the Structure can be done in the manner described above.
  • Furnaces for the austenitization of steel wires or other elongated metallic objects have the disadvantage, among other things, that the furnaces are relatively long and therefore require a large amount of space.
  • modules that are used in connection with furnaces for the austenitization of steel wires have the disadvantage that, particularly with large wire diameters, several water baths must be provided, which can be switched alternately with air cooling zones, which also requires a large overall length or a considerable space requirement required.
  • the object of the invention is to provide a furnace of the type mentioned, which is shorter than the stoves specified in the prior art and with which an elongated, in particular metallic object such as a steel wire can be heated to austenitizing temperature or another temperature in a simple manner.
  • Another object of the invention is to provide a device with such a furnace and a module, which enables the setting of a desired structure, for example of a steel wire, over a short distance, if this has previously been heated to or above an austenitizing temperature.
  • control loops are provided for setting the temperature in the oven sections in an oven of the type mentioned at the outset.
  • the first shaft and the second shaft together form a circuit along which the fan provided atmosphere or circulating air in the furnace can be continuously circulated.
  • the atmosphere can be conducted in cocurrent or countercurrent over the steel wires, for example at a speed of 15 to 25 ms -1 , which leads to a large amount of convection. Because of the convection, there is good heat transfer and therefore rapid heating of an elongated metallic object passed through the furnace. This results in a shorter treatment distance and therefore shorter construction than is the case with an oven without recirculation of the atmosphere.
  • the circulation also results in better controllability in part-load operation and the atmosphere in the furnace is independent of the load.
  • the furnace has several furnace sections in which the temperatures can be set separately.
  • the background is that, for example, in the case of heat treatment of steel wires, the steel wires in the area of the furnace inlet are cold and therefore a higher temperature is required in the first furnace section than in the subsequent furnace sections, in which the steel wire is basically already warm and only ensures a homogeneous temperature distribution in it shall be.
  • control loops for temperature adjustment are provided in the furnace sections according to the invention. This allows an optimal temperature profile to be set in the furnace or along the individual furnace sections. With regard to setting a temperature profile, it proves expedient in many cases that two to ten, in particular two to six, furnace sections are provided.
  • the heating element or elements can be provided in the first and / or second shaft. As a rule, it is expedient for efficient heating and targeted setting of temperatures to arrange the heating element or elements in the first shaft.
  • a furnace according to the invention is preferably used in the patenting of steel wires for heating the steel wires to or above an austenitizing temperature, but can also be used in other heat treatment processes such as tempering, diffusing or stress-relieving, where appropriate Additional devices are connected downstream, for.
  • the at least one fan can in principle be positioned at any position of the furnace. It is preferably provided that the fan is arranged closer to the kiln outlet than to the kiln inlet because circulation of the atmosphere in the kiln is usually circulated counter to a transport direction of a material to be treated or in countercurrent and a temperature load for the fan in the region of the kiln outlet is less than in the area of the stove inlet. It is also possible that several fans with several partial circles are provided for circulating the atmosphere. It is also advantageous if an oxidizing or reducing gas can be supplied in each pitch circle via provided feed lines, so that a process-dependent atmosphere can be maintained.
  • heating elements can be provided as heating elements, e.g. B. electric heating elements.
  • the heating elements are usually arranged along the first shaft.
  • the heating elements can be gas burners with which hot combustion gas can be fed in normally or transversely to the transport direction of the material to be treated. While the energy supply in the first shaft takes place at different positions transversely to the elongated object, convection is improved by the circulation of the atmosphere at a higher speed of, for example, 15 to 25 ms -1 , so that overall the material to be treated is rapidly heated.
  • gas burners are provided, the furnace can have at least one exhaust air outlet through which excess furnace exhaust air can escape.
  • gas burners are provided, they are preferably recuperation burners, waste heat from the furnace being usable for heating combustion gases, and preferably the combustion air supplied to the recuperation burners is preheated to 130 ° C. to 250 ° C.
  • cold air burners or warm air burners with central preheating can also be provided.
  • the furnace advantageously has a device for measuring a calorific value of a (combustible) gas used and a regulating unit for regulating a volume flow of combustion air supplied to the gas burners.
  • the combustible gases supplied or supplied to the gas burners can have different qualities, which can lead to a locally different atmosphere in the furnace. This is usually not desirable and is avoided by this device.
  • the first shaft has indentations for deflecting the circulated atmosphere.
  • the atmosphere in the furnace is not only circulated, for example, in countercurrent to the good being carried out, but also there is occasional cross-flow of the good being carried out, which favors rapid heating of the good and thus ultimately a short construction of the furnace.
  • the indentations means having the same or a similar effect can also be provided.
  • first shaft at the top and bottom in cross section with straight side walls, but to arrange deflecting plates at one or more positions which, like the indentations, ensure that the circulated atmosphere is deflected towards the moving or carried-through material.
  • deflecting plates at one or more positions which, like the indentations, ensure that the circulated atmosphere is deflected towards the moving or carried-through material.
  • any means for redirecting the recirculated atmosphere are suitable.
  • indentations it would in principle be optimal if they were to have an angle of approximately 90 ° on the inflow side, but this is not practical in view of the simultaneous circulation of the atmosphere, for example in direct current. However, the desired effects can already be achieved in a practical manner if the indentations on the inflow side have an angle of approximately 30 ° to 60 °. The same applies if, instead of the indentations, agents having the same or a similar effect are provided.
  • the first shaft runs horizontally and the at least one second shaft is arranged directly below the first shaft.
  • the two shafts, insofar as they are not directly connected, by one intermediate element are separated so that a circulation of the atmosphere in a circuit is possible.
  • the two shafts can be largely separated from one another by ceramic plates located between them.
  • Such a construction also offers advantages in terms of efficient heat management when operating the furnace.
  • the furnace is preferably designed such that the first shaft and the at least one second shaft merge into one another in the region of the furnace inlet and the furnace outlet, so that the atmosphere in the furnace can be circulated. In the other areas, the shafts are separated from one another as mentioned. With such a design, the convection effect achieved by the circulation of the atmosphere can be used throughout the furnace. For this reason, at least the first shaft should extend at least over 65%, preferably at least over 75%, of the length of the furnace. If the furnace is used for diffusion processes, however, it may be advisable that at least the first shaft does not extend to the furnace outlet but ends beforehand, so that a holding zone with heating elements for subsequent heat treatment can be integrated between one end of the first shaft and the furnace outlet.
  • one or more heat exchangers are preferably provided for utilizing waste heat from the furnace and the recuperation burner.
  • the waste heat can be used, for example, to heat drying ovens.
  • the gas burners, in particular recuperation burners fresh air supplied can be preheated by means of heat exchangers from the flue gas, for. B. by guiding an acid-resistant supply air duct made of stainless steel in an exhaust air outlet or chimney.
  • An oven according to the invention can, for example, be completely or exclusively bricked. However, it is preferred that the furnace is only bricked up to a certain height, but is formed on the head side with a detachably fastened cladding. This makes it possible to open the furnace in the event of faults or service or maintenance work and to carry it out inside the same work without major problems. In this case, removable insulation is arranged underneath the detachably fastened cladding, so that the furnace is well insulated from the environment, similar to a brick-only furnace.
  • the further object of the invention is achieved by a device with an oven and a module of the type mentioned at the beginning, in which the length of the water bath can be variably adjusted and the holding distance to the water bath can be correspondingly extended or shortened.
  • An advantage achieved with such a device can be seen in the fact that it can be made relatively short and nevertheless a desired structure can be set, for example when patenting steel wires with a diameter of up to 10 mm.
  • the module also offers great flexibility, since the length of the water bath can be variably adjusted so that the dimensions of a good to be treated can be taken into account or a desired cooling can be set based on an austenitizing temperature. Even with larger dimensions of steel wires, it has proven to be sufficient if only a single water bath is provided, which is followed by a stop section in which the material to be treated is kept at a certain temperature in order to complete the structural change.
  • the stop distance can be extended or shortened corresponding to the water bath, so that the material to be treated can always be guided in a defined atmosphere after exiting the water bath.
  • the water bath is suitably elongated.
  • the water bath advantageously has a plurality of parallel sections which can be variably adjusted in length separately.
  • the stop section is then formed with correspondingly extendable or shortenable sections. This makes it possible, for example, for several bundles of steel wires of different dimensions to be passed through the module in parallel for the purpose of heat treatment, without having to forego the advantages set out above.
  • a plurality of supply lines and, if appropriate, at least one discharge line for setting a cooling medium can be provided along the length of the water bath or the sections thereof.
  • the module is completed and the length of the water bath or the sections thereof can be adjusted, in particular, manually and / or automatically from the outside.
  • this allows the length of the water bath to be adapted accordingly.
  • the length of the water bath or the sections thereof can be adjusted continuously or discretely with individual segments, the distance of the segments from the module inlet to the module outlet decreasing in particular logarithmically.
  • an optimal length of the water bath can be set in a simple manner for almost any dimensions of, for example, steel wires.
  • An advantage achieved with a device according to the invention can be seen in the fact that it has a short or compact construction and therefore enables, for example, patenting of steel wires over a short distance or generally the setting of a desired structure of a material to be treated.
  • the oven is connected in an airtight manner to the module inlet of the module and its water bath. This ensures that what is to be treated It is good that the furnace leaves the furnace at a relatively high temperature and does not come into contact with an uncontrolled or uncontrollable atmosphere before immersing it in the water bath.
  • a pull-in device with reels and at least one band is provided, the at least one band running through the device and preferably being arranged in a lateral region thereof.
  • the tape which remains permanently positioned in the device, advantageously consists of a high-temperature resistant alloy.
  • the further object of the invention is achieved by a method of the type mentioned at the outset if a temperature setting in the furnace sections is carried out in a furnace according to the invention with control circuits.
  • good circulation is achieved by circulating the atmosphere in the furnace, so that a good to be treated can be heated to a desired temperature over a relatively short distance before the good is immersed in a water bath.
  • the atmosphere is circulated at a speed of up to 50 ms -1 , preferably 15 to 25 ms -1 , in order to achieve the desired convection effect as effectively as possible.
  • the atmosphere is circulated countercurrent to the transport direction of the elongated metallic object. Nevertheless, it is of course also possible for circulation to be carried out in the direction of transport.
  • the elongated metallic object is guided from the furnace into the module in a controlled atmosphere in order to avoid undesired contact with an uncontrolled or uncontrollable atmosphere.
  • the elongated metallic object is preferably cooled in a water bath by film boiling, as is known per se from the prior art.
  • a suitable additive is added to the water bath.
  • water or additive is metered in via a metering unit and an associated control circuit in order to keep an additive content in the water bath constant or within predetermined limits while maintaining a constant coolant temperature.
  • FIG. 1 and 2nd A first variant of an oven 1 according to the invention is shown.
  • the furnace 1 is elongated and has a furnace inlet 3 or furnace outlet 4 at the end.
  • the furnace 1 can be part of a device for heat treating, in particular patenting, steel wires.
  • the steel wires are introduced in bundles in the area of the oven inlet 3 and leave the oven 1 in the area of the oven outlet 4.
  • the oven 1 comprises a brick base, which is surrounded on the outside by a housing and carries a structure.
  • the construction includes a further part of the housing as well as insulation elements. How from Fig. 2 can be seen is in the lower part of the furnace 1 a first shaft 8 is formed.
  • a second shaft 9 is formed in the upper part of the furnace 1 or structure.
  • the first shaft 8 and the second shaft 9 run essentially along an entire length of the furnace 1 and parallel to one another.
  • the first shaft 8 and the second shaft 9 are connected to one another in the area of the furnace inlet 3 and the furnace outlet 4, so that an atmosphere in the furnace 1 can be circulated.
  • steel wires which are guided through the first shaft 8 for example for the purpose of heating to or above an austenitizing temperature and heated therein by means of heating devices (not shown in more detail), can be brought to the desired temperature along a relatively short distance.
  • the second shaft 9 is constructed and arranged above the first shaft 8. However, it is also possible for the second shaft 9 to be positioned next to the first shaft 8 or to run outside the housing.
  • a second, preferred variant of a furnace 1 is shown.
  • the oven 1 in turn has an oven inlet 3 and an oven outlet 4. Both the kiln inlet 3 and the kiln outlet 4 are closed or closable by an openable flap, the flaps each having one or more recesses approximately in the center, so that a wire 2 or more bundles of wires 2 can be inserted into and out of the oven 1 can be removed again.
  • the furnace 1 is elongated and has a plurality of furnace sections 5.
  • a plurality of heating elements 6 in the form of gas burners, in particular recuperation burners, are provided in the individual furnace sections 5. The gas burners are fed with a combustible gas and combustion air via a central main gas line.
  • the furnace 1 is formed with a first shaft 8, along which a wire 2 or one or more bundles of wires 2 can be guided. Suitable wire guides are provided for this.
  • second shafts 9 are arranged below the first shaft 8. The first shaft 8 is completely separated from the second shafts 9 along a longitudinal axis of the furnace 1 with the exception of end regions, for example in the region of the furnace inlet 3 and the furnace outlet 4.
  • the first shaft 8 merges into the second shafts 9 via a curve, the curves in the area of one Transport direction R of the wire 2 or possibly one or more bundles of wires 2 guided in parallel are interrupted.
  • the separation of the first shaft 8 from the second shafts 9, which is essentially given in the region of the longitudinal axis, can be carried out in a simple manner by ceramic elements 14 which extend over a width of the first shaft 8.
  • a plurality of first shafts 8 can also be provided, which merge into a single second shaft 9 or a plurality of separate second shafts 9.
  • a masonry 13 additionally comprises webs, so that the ceramic elements are carried laterally by the masonry 13 and at the same time rest on the webs. This ensures that the ceramic elements 14 can withstand the given mechanical loads even with a thin design. This also leads to the formation with three second shafts 9, although only a second shaft 9 can also be present. It is also possible for the webs to be formed only in sections.
  • the masonry 13 extends over the height of the second shaft 8 and carries components 12, which together with the ceramic elements 14 define the first shaft 8 at least in some areas, and a removable insulation 16.
  • a detachably fastened cladding 15 is arranged above the insulation 16 on the head side .
  • the combination of detachably fastened cladding 15 in the area on the head side and the removable insulation 16 arranged underneath it allows the furnace 1 to be opened from above, for example for service or maintenance work, which is not possible with a brick-only furnace.
  • a fan 7 is arranged in that end region of the furnace 1 which is adjacent to the furnace outlet 4. With the fan 7, an atmosphere located in the furnace 1 can be circulated along the first shaft 8 and the second shafts 9, in countercurrent to the transport direction R, as shown in FIG Fig. 3 is indicated by several arrows.
  • the first shaft 8 has indentations 10, so that the atmosphere or circulating air flows in certain directions towards the wire 2 or the wires 2 at an angle.
  • the furnace 1 is not only of short construction, but is also highly energy-efficient, especially since the first shaft 8 is separated from the second shafts 9 only by the ceramic elements 14, which consist for example of cordierite. Since additional gases can be introduced into the first shaft 8 in order to, for. B. adjust the atmosphere or recirculated air, small-sized exhaust outlets 11 are also provided, through which excess recirculated air can be removed so that it there is no undesirable pressure build-up.
  • a temperature can be set in the individual furnace sections 5 by means of provided control loops and regulation of the recuperation burners. In particular, so-called low-load operation is also possible, since sufficient heating of a wire 2 or possibly one or more bundles of wires 2 can be achieved even at low loads through the intended circulation of the circulating air. This is otherwise a major problem when using gas burners, because the already poor heat transfer is throttled even further.
  • FIG. 5 A module 17 can be seen, which has a water bath 18 and a holding section 19, the holding section 19 connecting to the water bath 18.
  • the module 17 has a module inlet 20 and a module outlet 21, which are each arranged at the ends.
  • the module inlet 20 directly adjoins the furnace Fig. 3 in such a way that the wire 2 dips from the furnace outlet 4 directly into the water bath 18 of the module 17 without coming into contact with an atmosphere surrounding the device. This ensures that the steel wire which is at the austenitizing temperature is not adversely changed or is not adversely changed before it is immersed in the water bath 18.
  • the water bath 18, which in Fig. 5 as the entire module 17 is only shown schematically, the length can be changed.
  • a crank can be provided on the outside, with which a weir can be continuously adjusted.
  • the water bath 18 can be subdivided into individual segments which can be flooded as required or a required length of a cooling section.
  • the water bath 18 has a plurality of sections which can be regulated in parallel and independently of one another, each of the sections being variable in length.
  • the holding section 19 is formed with a plurality of holding zones which can be operated independently of one another and each comprise one or more heating devices.
  • a temperature can be set in each of the individual holding zones by the heating devices, for example in the range from 500 ° C. to 600 ° C., as may be necessary for patenting steel wires.
  • a single water bath 18 in combination with a holding section 19 with a plurality of temperature-controlled holding zones is sufficient for patenting steel wires with cross sections of at least up to 15 mm 2 .
  • the holding section 19 is designed according to a length adjustability of the water bath 18 with correspondingly extendable or shortenable elements. These elements can be designed, for example, in the form of pull-out panels which also have insulation on the inside. It is also possible that the holding section 19 can be partially or completely telescopically extended at the end adjoining the water bath 18.
  • a drawing device 22 is shown, which can be provided in connection with a device from a furnace 1 and a module 17 connected to it, in particular if the device is used for the heat treatment of steel wires.
  • the pull-in device 22 has two reels 23, 24, on each of which a band 25 is rolled up. Both reels 23, 24 are provided with a motor so that the belts 25 can be moved in one direction or the other as required.
  • the entire pull-in device 22 can be an integral part of a device with an oven 1 and an adjoining module 17 with a water bath 18 and a holding section 19.
  • the strips 25 of the drawing-in device 22, which run through the furnace 1 and the module 17, are arranged laterally, in particular laterally in the first shaft 8 in a furnace 1 according to FIG Fig. 3 or a module 17 according to Fig. 5 . Since the belts 25 only require a small amount of space, this does not result in a loss of capacity.
  • the tapes 25 are expediently made of a high-temperature alloy to withstand the high temperatures. Basically, the tapes 25 are wound onto the reel 23 as far as possible. Only one end of the tapes 25 is connected to the reel 24. When starting a production, a so-called preference is fastened to the strips 25, with which the wires 2 can ultimately be inserted into the device.
  • the preference must be transported through the entire device by winding the tapes 25 with the preference attached to the reel 24. If the preference is passed through the device, the wires 2 can then be drawn in.
  • there is also one equipped with a motor Auxiliary winder 26 is provided, on which wires 2 or wire bundles already carried out can be temporarily wound up. The wires 2 are then kept in motion until they are welded on by the auxiliary winder 26, and disadvantageous wire stoppages in the furnace 1 can be avoided.
  • FIG. 8 Another variant of an oven 1 according to the invention is shown in a highly schematic manner.
  • the furnace 1 is designed as a diffusion furnace and has one or more fans 7, preferably two fans 7. With the fans 7, recirculated air is circulated along the first shaft 8 and the two second shafts 9, in countercurrent to a wire 2 which is guided through the furnace 1.
  • Components for heating are arranged in the second shafts 9, preferably electrical or gas-heated heating elements, e.g. B. electric heating register.
  • the furnace 1 is formed on the inlet side with a zone in which the wire 2 that is passed through is exposed vertically to a heating medium, so that the wire 2 is brought to temperature quickly or over a short distance. In the subsequent zone, the wire 2 only needs to be kept at temperature, which is achieved by circulating the atmosphere with the fans 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Tunnel Furnaces (AREA)
EP11702388.7A 2010-02-04 2011-01-25 Vorrichtung und verfahren zum wärmebehandeln von stahldrähten Active EP2531624B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0015310A AT509356B1 (de) 2010-02-04 2010-02-04 Vorrichtung und verfahren zum wärmebehandeln von stahldrähten
PCT/AT2011/000039 WO2011094775A1 (de) 2010-02-04 2011-01-25 Vorrichtung und verfahren zum wärmebehandeln von stahldrähten

Publications (2)

Publication Number Publication Date
EP2531624A1 EP2531624A1 (de) 2012-12-12
EP2531624B1 true EP2531624B1 (de) 2020-04-08

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EP11702388.7A Active EP2531624B1 (de) 2010-02-04 2011-01-25 Vorrichtung und verfahren zum wärmebehandeln von stahldrähten

Country Status (6)

Country Link
EP (1) EP2531624B1 (ja)
JP (2) JP5764833B2 (ja)
CN (1) CN102782164B (ja)
AT (1) AT509356B1 (ja)
CA (1) CA2787403C (ja)
WO (1) WO2011094775A1 (ja)

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Publication number Priority date Publication date Assignee Title
AT513628B1 (de) * 2013-04-29 2014-06-15 Cpa Comp Process Automation Gmbh Verfahren und Vorrichtung zum Wärmebehandeln von Langprodukten
CN107058719A (zh) * 2016-08-23 2017-08-18 江苏兴达钢帘线股份有限公司 高碳钢丝水浴淬火长度调整装置
MX2020011220A (es) * 2018-11-19 2021-02-09 Lohia Corp Ltd Aparato y metodo para el tratamiento termico de tiras de tela en movimiento.
CN115141913A (zh) * 2022-07-28 2022-10-04 南通华东特种钢丝有限公司 一种钢丝感应式退火线

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE834316A (fr) * 1975-10-08 1976-02-02 Dispositif d'obiuration pour chambre de traitement d'elements continus et four-tunnel equipe d'un tel dispositif

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Publication number Priority date Publication date Assignee Title
GB491052A (en) * 1937-09-17 1938-08-25 Clarence Bon Hoak Improvements in or relating to furnaces for treating metals
US3169157A (en) * 1962-07-17 1965-02-09 Acrometal Products Inc Annealing oven for continuously moving wire
JPS50148309U (ja) * 1974-05-27 1975-12-09
JPS51141705A (en) * 1975-06-02 1976-12-06 Daido Steel Co Ltd A method of operating heat treatment furnaces
JPS54110112A (en) * 1978-02-17 1979-08-29 Sumitomo Electric Ind Ltd Method and apparatus for heat treatment method of steel rod
US4177754A (en) * 1978-05-30 1979-12-11 Fennell Corporation Apparatus for obtaining bright finish galvanizing coating on wire
JPS57143440A (en) * 1981-02-28 1982-09-04 Sumitomo Electric Ind Ltd Heat treatment of steel wire rod
JPS6013035Y2 (ja) * 1981-07-29 1985-04-25 石川島播磨重工業株式会社 熱処理炉
JPS5983965U (ja) * 1982-11-30 1984-06-06 古河電気工業株式会社 線条体の焼鈍炉
JPS59232237A (ja) * 1983-06-14 1984-12-27 Sumitomo Electric Ind Ltd 金属線の熱処理方法
GB8523882D0 (en) 1985-09-27 1985-10-30 Bekaert Sa Nv Treatment of steel wires
FR2607519B1 (fr) * 1986-11-27 1989-02-17 Michelin & Cie Procede et dispositif pour traiter thermiquement un fil d'acier
JPS63119657U (ja) * 1987-01-23 1988-08-02
JPH0322267Y2 (ja) * 1987-04-03 1991-05-15
JPH0382716A (ja) * 1989-08-24 1991-04-08 Nippon Steel Corp 線材コイルの熱処理方法およびその熱処理炉
JPH0623919Y2 (ja) * 1990-10-25 1994-06-22 品川白煉瓦株式会社 工業窯炉の仕切壁構造
JP2919122B2 (ja) * 1991-07-22 1999-07-12 古河電気工業株式会社 熱風循環式光輝焼鈍装置
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BE834316A (fr) * 1975-10-08 1976-02-02 Dispositif d'obiuration pour chambre de traitement d'elements continus et four-tunnel equipe d'un tel dispositif

Also Published As

Publication number Publication date
CA2787403A1 (en) 2011-08-11
CA2787403C (en) 2018-03-13
WO2011094775A1 (de) 2011-08-11
AT509356B1 (de) 2011-12-15
CN102782164A (zh) 2012-11-14
AT509356A1 (de) 2011-08-15
JP2013518986A (ja) 2013-05-23
JP6133359B2 (ja) 2017-05-24
CN102782164B (zh) 2014-11-12
EP2531624A1 (de) 2012-12-12
JP2015178680A (ja) 2015-10-08
JP5764833B2 (ja) 2015-08-19

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