EP0710166B1 - Anordnung zur verbindung einer stopfenstange für ein metallurgisches gefäss mit ihrer hebevorrichtung und für die anordnung geeignete stopfenstange sowie verfahren zur herstellung der anordnung - Google Patents

Anordnung zur verbindung einer stopfenstange für ein metallurgisches gefäss mit ihrer hebevorrichtung und für die anordnung geeignete stopfenstange sowie verfahren zur herstellung der anordnung Download PDF

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Publication number
EP0710166B1
EP0710166B1 EP94920872A EP94920872A EP0710166B1 EP 0710166 B1 EP0710166 B1 EP 0710166B1 EP 94920872 A EP94920872 A EP 94920872A EP 94920872 A EP94920872 A EP 94920872A EP 0710166 B1 EP0710166 B1 EP 0710166B1
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EP
European Patent Office
Prior art keywords
stopper rod
carrier
arrangement according
sleeve
pressed
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.)
Expired - Lifetime
Application number
EP94920872A
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German (de)
English (en)
French (fr)
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EP0710166A1 (de
Inventor
Burkhard Labod
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Individual
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Individual
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Publication date
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Publication of EP0710166A1 publication Critical patent/EP0710166A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • B22D41/18—Stopper-rods therefor

Definitions

  • the invention relates to an arrangement of the type corresponding to the preamble of claim 1 and also includes a method for producing the device.
  • refractory stopper rods to control the flow of molten metal from a pan or tundish into a mold
  • the stopper rod is moved in the direction of its longitudinal axis by a lifting device adjacent to the outside of the tundish, whereby a pouring opening arranged at the bottom of the tundish, into which the stopper rod engages in the lowered state and flows completely, is opened more or less.
  • the flow of the molten metal can thus be regulated. In principle, this regulation is quite simple, but the extreme conditions prevailing in steel processing place special demands on the materials and the technical design of the plug rod.
  • the stopper rod has to withstand the action of a molten metal for hours.
  • the stopper rod must also be suitable to withstand the strong temperature fluctuations which act on the stopper rod during a casting process and the lateral forces caused by the buoyancy of the molten metal which exert a strong bending moment on the stopper rod. A breakage of the stopper rod inevitably means that the spout can no longer be closed, which leads to an uncontrolled outflow of the melt has the consequence. It therefore poses a significant security risk.
  • a disadvantage of this early embodiment is that the provision of the plug rods requires a relatively high amount of material and labor on site.
  • the steel rods also tend to warp due to the temperature gradients and fluctuations that occur during casting, which can easily lead to the sheathing breaking and thus to the destruction of the plug rod.
  • Such plug rods are usually produced by isostatic pressing of powdered ceramic material into a blank, which is then fired, i.e. is subjected to a temperature treatment for the purpose of sintering.
  • a one-piece holding rod usually made of steel, which extends over a certain area into the stopper rod and is firmly connected to it.
  • a gas channel is incorporated into the holding rod, which communicates on the one hand with the longitudinal bore of the stopper rod and on the other hand with a connecting device for the gas supply line. It is particularly important that the connection between the support rod and the plug rod prevents ambient air from getting into the interior of the plug rod and thus into the molten steel, since this would lead to increased oxidation and thus to a deterioration in the steel quality.
  • connection between the ceramic plug rod and the metallic holding rod is problematic in particular because of the high thermal and mechanical loads acting on the connection.
  • a ceramic threaded insert which is adapted to the holding rod and which can be screwed into the stopper rod from above into a thread which is incorporated by isostatic pressing in the upper region of the stopper rod.
  • the disadvantage of this device is that the wall thickness of the plug rod is greatly reduced in the area of the thread used, as a result of which it breaks easily in this area.
  • this device is relatively complex to manufacture because of the use of ceramic thread inserts which are to be produced separately.
  • both the stopper rod and the holding rod are simple to manufacture and also easy to separate, but the entire load occurring when the stopper rod is lifted acts on the material surrounding the transverse bore, which in turn often leads to material breaks. In addition, the production of a gas-tight connection is difficult.
  • a threaded hole is machined by isostatic pressing into the upper end of the stopper rod, into which the holding rod is screwed directly into the stopper rod with its thread provided at the lower end.
  • a gas-tight connection between the stopper and the holding rods is possible with this device, but the different thermal expansion coefficients of ceramic result and steel to form stresses in the thread, which can lead to the plug rod breaking, particularly at higher temperatures.
  • a further development of the above-mentioned embodiments is a device according to EP 0 358 535 A 2.
  • a metallic threaded bushing is isostatically pressed in the upper region of the longitudinal bore, which is located on the outside via alternately arranged all-round grooves and all-round webs in engagement with the ceramic plug rod material.
  • An annular sealing surface is formed in the stopper rod above the threaded bushing by increasing the diameter of the longitudinal bore. From above, the holding rod provided with a corresponding thread can be screwed into the threaded bushing until a sealing collar arranged above the thread is supported on the sealing surface of the annular sealing seat.
  • an external thread is provided on the holding rod above the sealing collar in order to counter the stopper by means of a holding plate and a screwed-on nut.
  • a disadvantage of this embodiment is that the metallic threaded bushing can easily scale during firing, which can make it difficult to screw in the holding rod.
  • the tightening of the lock nut which counteracts the contact pressure of the sealing collar of the holding rod on the annular sealing surface of the stopper rod, can lead to a lifting of both sealing surfaces from one another due to the different thermal expansion coefficients of the materials.
  • This device is also relatively expensive to manufacture.
  • the sealing collar provided on the holding rod and the thread necessary for screwing on the lock nut require the machining of the holding rod from a blank which has at least the outer diameter of the sealing collar.
  • the resulting material loss during processing is of the order of 50%. In particular, it therefore represents a significant cost factor represents, because the service life of the support rod is relatively short, in particular due to rapid scaling in the lower area exposed to the strongest temperature.
  • the lower part of the stopper rod is only intended for single use, material can be saved in this arrangement compared to previous embodiments, since in particular the lower part of the holding rod is exposed to high thermal loads and is therefore scaled after a short period of use. If, in earlier embodiments, the entire holding rod had to be exchanged for a new one after a certain degree of scaling had been reached in the lower region of the holding rod, the upper part, which is more complex to produce, remains usable for a considerably longer time due to the division of the holding rod.
  • inserts also avoid that in the event of a sudden contraction of the gas in the inner volume, which can occur, for example, when the plug rod is partially pulled out of a tundish to release the pouring opening by partial cooling of the plug rod, molten metal is sucked into the inner volume.
  • the invention has for its object to further develop a generic arrangement so that on the one hand a worn plug rod can be replaced by a new handle in a few simple steps, on the other hand, the design of the plug rod allows, after firing, the inserts for reduction already described in their effect to be able to insert the effects caused by changes in gas volume into the longitudinal recess of the stopper rod.
  • the plug rod can be mounted on the support rod designed as a support tube in a simple manner in that the support tube is inserted with a preassembled stop into the longitudinal recess of the stopper rod and a locking member which is in a transverse opening corresponding to the inner volume of the support tube rests, is displaced by suitable means such that it engages behind the upper boundary surface of an installation space provided in the stopper rod.
  • the locking member can be pushed back into the cross section of the carrier for dismantling the stopper rod in that the carrier is pushed a bit into the stopper rod after the stop has been released. After this shift can the plug rod can be pulled down from the carrier.
  • the installation space is provided in the inner volume of a press-in sleeve which is pressed into the plug rod during isostatic pressing.
  • the press-in sleeve is simple and inexpensive to manufacture if it consists of a rotationally symmetrical turned part (claim 3).
  • the press-in sleeve In order to distribute the holding forces over a larger area of the plug rod material and thus to be able to lower the material load, it can be advantageous to provide the press-in sleeve with at least one outer all-round groove.
  • This measure can also serve to accommodate a heat-resistant sealing ring if special requirements make a particularly good sealing effect between the press-in sleeve and the plug rod necessary.
  • a correspondingly better sealing effect between the press-in sleeve and the carrier can be achieved according to claim 6 in that the press-in sleeve has at least one inner all-round groove in its area forming part of the longitudinal recess, in which a heat-resistant sealing ring rests.
  • the press-in sleeve has at least one inner all-round groove in its area forming part of the longitudinal recess, in which a heat-resistant sealing ring rests.
  • the carrier is particularly suitable for connecting the gas supply and for mounting in the plug rod if it has a central longitudinal bore according to claim 10.
  • the transverse opening then advantageously consists of a radial bore, which is arranged perpendicular to the longitudinal axis of the carrier and communicates with its longitudinal bore.
  • a cylindrical bolt the length of which corresponds approximately to half the outer diameter of the carrier, advantageously serves as the locking member in this embodiment.
  • the bolt In the inserted state, ie in the "unlocked” position, the bolt thus protrudes approximately up to the longitudinal axis of the carrier into its longitudinal bore.
  • the position of the bolt "locked” can advantageously be selected so that it corresponds to a displacement of the bolt into a position that closes with the inner circumference of the longitudinal bore.
  • Securing the bolt in the "locked" position can then be done in a simple manner by providing a cross-sectional constriction reducing the diameter of the longitudinal bore at the lower end of the carrier, on which a securing sleeve inserted from above into the longitudinal bore of the carrier is supported, which covers the radial bore (claims 13 and 14).
  • a further preferred embodiment of the locking member, in which the securing sleeve can be dispensed with, and the configuration of the transverse opening necessary for receiving this locking member is the subject of claims 15 and 16.
  • the stop is formed by a nut screwed onto an external thread of the carrier which extends upward from the end face of the stopper rod and which opposes one another supports the end face by means of a thrust washer.
  • the shifting of the locking member from the "unlocked” position to the "locked” position can advantageously be carried out according to claim 21 by means of an assembly aid rod that can be inserted into the longitudinal bore of the carrier, the end of which is to be inserted and is thus suitable for locking the locking member about its position " unlocked "in the longitudinal hole protruding length to the outside.
  • a method which is particularly suitable for producing a device according to one of the previous claims is the subject of claim 22.
  • a secure, non-detachable and essentially tight-fitting seat of the press-in sleeve or the support ring in the stopper rod is achieved in that the press-in sleeve or the support ring during isostatic pressing the plug rod is pressed into it and then burned together with the plug rod.
  • the installation space required below the support ring can advantageously be generated in the stopper rod according to claim 23 by pressing a spacer sleeve under isostatic pressing, which is made of a pressure-stable material such as plastic or the like, which evaporates and / or burns during the subsequent firing .
  • the press-in sleeve or the support ring is coated with a material before the common isostatic pressing, which evaporates during the firing.
  • the information refers to the hanging operating position of the arrangement shown in FIGS. 1, 3 and 4.
  • two different embodiments of the locking member are shown on both sides of the longitudinal axis of the arrangement, which are usually used alternatively. In principle, however, it is also possible to use both embodiments together in an arrangement according to the invention.
  • the arrangement designated 100 in the drawing as a whole consists of an elongated, metallic carrier 10 which, with its lower region 1, is in one Longitudinal recess 8 of a refractory, ceramic plug rod 2 protrudes.
  • the carrier 10 has a central longitudinal bore 3 extending over its entire length, the diameter of which is approximately 30% of the outer diameter of the carrier 10.
  • the carrier 10 On its outer periphery 5, the carrier 10 carries an external thread 6, which extends from its upper end 4 to its lower region 1 and serves on the one hand to accommodate a nut 7 and on the other hand to fasten the carrier 10 to a lifting device (not shown in the drawing).
  • the nut 7 forming a stop 7O delimits the lower region 1 of the carrier 10 which can be inserted into the longitudinal recess 8 of the stopper rod 2 and is supported on the upper end face 11 of the stopper rod 2 by means of a thrust washer 9.
  • a thrust washer 9 Approximately in the middle of the lower region 1 of the carrier 10, two radial bores 12, 13 running perpendicular to the longitudinal axis L of the arrangement are machined into the carrier 10.
  • the bores 12, 13 form transverse openings 5O, 5O 'and serve to accommodate locking members 6O, 6O' which can be displaced perpendicularly to the longitudinal axis L and which serve to lock the carrier 10 in the plug rod 2.
  • the locking member 6O ' consists of a cylindrical bolt 14 which rests in the bore 12 and forms a sliding fit with it.
  • the end of the bolt 14, which has a length of approximately half the outer diameter of the carrier 10, facing the longitudinal bore 3 is designed as a steep, tapering cone 15.
  • the bolt 14 In the "unlocked" position, the bolt 14 remains entirely in the cross section of the carrier 10 and extends approximately from the outer mouth of the bore 12 to the longitudinal axis L of the arrangement, so that the lower region 1 of the carrier 10 into the longitudinal recess 8 of the stopper rod 2 can be inserted.
  • the bolt 14 protrudes by about half the diameter of the longitudinal bore 3 from the cross section and engages behind an upper boundary surface 16, which is oriented perpendicular to the longitudinal axis L of the arrangement, of an installation space 17 which widens the longitudinal recess 8 and which is provided within the plug rod 2.
  • the carrier 10 cannot be pulled up out of the plug rod 2.
  • the upper boundary surface 16 is included an undercut 18 provided.
  • a further securing of the bolt 14 in its "locked" position is provided by a securing sleeve 19 which can be inserted into the longitudinal bore 3 and which is supported on a cross-sectional constriction 51 provided at the lower end 20 of the carrier 10.
  • the cross-sectional constriction 51 is formed by means of a perforated disk 21 attached to the lower end 20 of the carrier 10, the hole diameter 22 of which corresponds approximately to the inner diameter 23 of the securing sleeve.
  • the perforated disc is secured to the carrier 10 by a spot weld 35, which can be released, if necessary, by an external force, for example by a hammer blow.
  • the securing sleeve 19 extends from the perforated disk 21 so far upward in the longitudinal bore 3 that it covers the bore 12 with its outer circumference, so that the bolt 14 cannot "shift" out of its position.
  • the locking member in the embodiment of the locking member 60 shown in FIGS. 1, 3 and 4 on the right side of the longitudinal axis L, the locking member consists of a bolt 24 which carries a countersunk-shaped extension 25 at its outward end.
  • the total length of the bolt 24, corresponding to the bolt 14, is approximately half the diameter of the carrier 10, the side of the bolt 24 facing the longitudinal bore 3 likewise ends in a steep, tapered cone 26.
  • the bolt 24 forming a sliding fit with the bore 13 is fully inserted into the support 10, so that the countersunk-shaped extension 25 rests in a countersink 27 machined into the support 10 from the outside.
  • the bolt 24 In the "locked" state, the bolt 24 is in a position in which it protrudes from the support approximately over the thickness of the head-shaped extension 25.
  • the projecting, oblique annular surface 28 of the countersunk extension 25 interacts with the undercut 18 of the upper boundary surface 16 of the installation space 17, so that the bolt 24 cannot "shift” from its position automatically.
  • the assembly aid rod 36 which can be inserted into the longitudinal bore 3 of the support 10O from above and which is illustrated in FIG. 2 is.
  • the assembly auxiliary rod 36 consists of an elongated round rod 37, which comprises a handle 38 at its upper end. Its lower end forms a tapered cone 39 which, when inserted, interacts with the cones 15, 26 of the bolts 14, 24 located in the cross section of the support 10 and displaces them outwards. In this "locked” position, the bolts 14, 24 engage behind the upper boundary surface 16, so that the support 10 can no longer be pulled out of the plug rod 2.
  • the carrier 10 By subsequently tightening the nut 7 against the upper end face 11 of the plug rod 2, the carrier 10 can be countered, thereby ensuring a tight fit.
  • a sealing packing can be inserted into the threads covered by the nut 7.
  • the rotationally symmetrical installation space 17 is incorporated into a press-in sleeve 29, which consists of a turned part made of a metallic material.
  • the installation space 17 faces away from the upper boundary surface 16 cylindrical region 3O extending below, to which a flat, conically tapering region 31 adjoins, which merges into the longitudinal recess 8.
  • the bolts 14, 24 possibly after removing the securing sleeve 19 - after removing or moving up the nut 7 from its position "locked” into the "unlocked” position that the Carrier is pushed further into the longitudinal recess 8 of the plug rod 2 and the bolts 14, 24 are inserted through the side walls of the flat conical region 31 of the installation space 17 into the cross section of the carrier 10. After this process, the carrier 2 can be pulled up out of the stopper rod.
  • the press-in sleeve In its area 32 above the upper boundary surface of the installation space, the press-in sleeve forms part of the longitudinal recess 8. In this area 32, an inner all-round groove 33 is machined into the press-in sleeve 29, which serves to receive a heat-resistant sealing ring 34. Through the sealing ring 34, the high sealing effect between the press-in sleeve 29 and the carrier 10 required in special applications can be achieved.
  • the press-in sleeve 29 has a cylindrical outer shape.
  • a flat key surface 4O milled into its outer circumference serves to prevent it from rotating in the stopper rod 2. Since the press-in sleeve 29 is pressed isostatically together with the plug rod 2, its outer circumference is completely surrounded by the ceramic plug rod material.
  • two circumferential grooves 41, 42 which are at a vertical distance from one another are additionally worked into the outer circumference of the press-in sleeve 29 '.
  • This configuration of the press-in sleeve 29 ' creates additional connecting surfaces between the press-in sleeve 29' and the plug rod 2, so that the total of the plug rod material acting surface load is reduced compared to the embodiment of FIG. 1.
  • This embodiment is also particularly suitable for applications in which a particularly good sealing effect between the carrier 10 and the plug rod 2 is required, since, for example, a heat-resistant sealing ring 43, as shown in FIG. 3, can be inserted into the upper all-round groove 41.
  • the configuration of the arrangement according to FIG. 4 which is inexpensive to produce is recommended.
  • only a support ring 44 is isostatically pressed into the stopper rod 2 to distribute the holding forces exerted on the stopper rod material by the carrier 10 whose underside 45 forms the upper boundary surface 16, which in turn has an undercut 18.
  • the security against rotation of the support ring 44 in the plug rod 2 can in turn serve a flat key surface, not shown in the drawing.
  • the installation space 17 can be formed in two ways. On the one hand, a contour insert 46 consisting of a molded metal part, the inner volume of which has the described shape of the installation space 17, can be pressed in isostatically below the support ring 44.
  • a pressure-resistant spacer sleeve 47 the outer contour of which corresponds to the "negative" of the described shape of the installation space 17, i.e. which forms the installation space 17 directly into the plug rod material during isostatic pressing.
  • a spacer sleeve 47 is made of a material, e.g. pressure-resistant plastic or the like, which evaporates and / or burns during a subsequent heat treatment of the stopper rod, the so-called "burning".

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Furnace Charging Or Discharging (AREA)
EP94920872A 1993-07-23 1994-07-13 Anordnung zur verbindung einer stopfenstange für ein metallurgisches gefäss mit ihrer hebevorrichtung und für die anordnung geeignete stopfenstange sowie verfahren zur herstellung der anordnung Expired - Lifetime EP0710166B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4324768A DE4324768C1 (de) 1993-07-23 1993-07-23 Anordnung zur Verbindung einer Stopfenstange für ein metallurgisches Gefäß mit ihrer Hebevorrichtung und für die Anordnung geeignete Stopfenstange sowie Verfahren zur Herstellung der Anordnung
DE4324768 1993-07-23
PCT/DE1994/000800 WO1995003145A1 (de) 1993-07-23 1994-07-13 Anordnung zur verbindung einer stopfenstange für ein metallurgisches gefäss mit ihrer hebevorrichtung und für die anordnung geeignete stopfenstange sowie verfahren zur herstellung der anordnung

Publications (2)

Publication Number Publication Date
EP0710166A1 EP0710166A1 (de) 1996-05-08
EP0710166B1 true EP0710166B1 (de) 1997-10-01

Family

ID=6493547

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94920872A Expired - Lifetime EP0710166B1 (de) 1993-07-23 1994-07-13 Anordnung zur verbindung einer stopfenstange für ein metallurgisches gefäss mit ihrer hebevorrichtung und für die anordnung geeignete stopfenstange sowie verfahren zur herstellung der anordnung

Country Status (9)

Country Link
US (1) US5695675A (cs)
EP (1) EP0710166B1 (cs)
JP (1) JP3272726B2 (cs)
CZ (1) CZ284128B6 (cs)
DE (2) DE4324768C1 (cs)
ES (1) ES2107844T3 (cs)
HU (1) HU218192B (cs)
PL (1) PL178337B1 (cs)
WO (1) WO1995003145A1 (cs)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4444617A1 (de) * 1994-12-15 1996-06-27 Burkhard Labod Anordnung zur Verbindung einer Stopfenstange für ein metallurgisches Gefäß mit ihrer Hebevorrichtung
GB9613810D0 (en) * 1996-07-02 1996-09-04 Foseco Int Stopper rod
DE19823988C2 (de) * 1998-05-29 2000-07-20 Didier Werke Ag Stopfen für den Verschluß von Metallschmelze aufnehmenden Behältnissen
TWI801368B (zh) 2017-03-17 2023-05-11 法商維蘇威法國公司 用於機械式地耦接一陶瓷件至一桿的零件的套件以及用於一輸送系統的輸送輥總成

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2210305A (en) 1987-10-02 1989-06-07 Thor Ceramics Ltd Refractory monoblock stopper
US4946083A (en) * 1988-12-29 1990-08-07 Vesuvius Crucible Company One-piece stopper rod
DE4028793A1 (de) 1990-09-11 1992-03-12 Didier Werke Ag Einrichtung zum halten eines stopfens bei einem metallurgischen gefaess sowie stopfen fuer eine solche einrichtung
DE4040189C1 (en) * 1990-12-15 1992-01-02 Didier-Werke Ag, 6200 Wiesbaden, De Ceramic plug for outlet from metallurgical vessel - has supporting pipe with annular space to form sealing face, and nut is screwed onto it through which gas is delivered
DE4212450A1 (de) * 1991-11-26 1993-05-27 Didier Werke Ag Einrichtung zum halten eines stopfens und stopfen

Also Published As

Publication number Publication date
ES2107844T3 (es) 1997-12-01
HU218192B (hu) 2000-06-28
JPH09500580A (ja) 1997-01-21
EP0710166A1 (de) 1996-05-08
CZ284128B6 (cs) 1998-08-12
HUT73825A (en) 1996-09-30
PL312620A1 (en) 1996-04-29
US5695675A (en) 1997-12-09
HU9600120D0 (en) 1996-03-28
WO1995003145A1 (de) 1995-02-02
DE4324768C1 (de) 1994-08-25
CZ10896A3 (en) 1996-05-15
PL178337B1 (pl) 2000-04-28
JP3272726B2 (ja) 2002-04-08
DE59404228D1 (de) 1997-11-06

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