EP0123121B1 - Installation de chargement pour alimenter en acier fondu des machines de coulée en continu dont les parois de lingotière se déplacent dans le mDme sens que la direction de coulée - Google Patents
Installation de chargement pour alimenter en acier fondu des machines de coulée en continu dont les parois de lingotière se déplacent dans le mDme sens que la direction de coulée Download PDFInfo
- Publication number
- EP0123121B1 EP0123121B1 EP84102964A EP84102964A EP0123121B1 EP 0123121 B1 EP0123121 B1 EP 0123121B1 EP 84102964 A EP84102964 A EP 84102964A EP 84102964 A EP84102964 A EP 84102964A EP 0123121 B1 EP0123121 B1 EP 0123121B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- casting
- sprue
- pouring body
- tundish
- casting machine
- 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
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/064—Accessories therefor for supplying molten metal
- B22D11/0642—Nozzles
Definitions
- the invention relates to a feed device for introducing molten steel into continuous casting machines with mold walls moving in the casting direction, with a tubular, closed casting body which is movable and height-adjustable with respect to the continuous casting machine, via whose mouthpiece protruding between the mold walls, a sealing gap can be produced therewith and preceded by a front container, whereby this is adjustable in height and at least the latter can be moved from the two parts which can be connected to one another via the casting body - continuous casting machine and front container.
- steel for example with a casting cross section of approximately 70 x 180 mm, can be cast at speeds of around 10 m / min. Only cast to the strand with casting machines that have moving mold walls. Attempts to process steel at higher casting speeds in such continuous casting machines have, however, not yet led to casting products of sufficiently good metallurgical quality.
- a cooperating with a rigid casting mold supply device for introducing molten steel is known, the tubular casting body is immovably connected to a header tank and can be moved with respect to the continuous casting mold as well as height adjustable.
- the sealing of the annular gap between the back and forth, d. H. temporarily also in the casting direction moving casting mold and the pouring body protruding into it is brought about by generating induction forces by means of a magnetic coil which surrounds the casting mold on the outside and is also effective in its initial section.
- the disadvantage of the known design is that it can only be aligned with respect to the continuous casting mold by moving and adjusting the height of the heavy front container.
- a front container with a rigid nozzle is connected via a ball joint to a rigid casting mold which is rigid in itself.
- the movable part of the ball joint forms a short casting body in the form of a spherical section, which is supported via its convex surface in the concave counter surface of the connecting piece.
- the end face of the spherical section facing away from the front container is sealingly held against an annular plate which at the same time forms the immovable mouthpiece of the spherical section. Screws attached to the header serve as pressure elements.
- the disadvantage of this known proposed solution is that the only compensating movement is a rotary movement between the front container and the continuous casting mold.
- the header warms up more than the continuous casting mold, i. H. the two parts mentioned move against each other in the vertical direction, which would make an automatic height adjustment necessary.
- this is not provided and, because of the short construction of the pouring body, is also not feasible.
- the invention is based on the knowledge known per se that flawless cast products can only be achieved by means of continuous casting machines in the form of double belt casting machines if the molten steel can be introduced between the moving mold walls of the continuous casting machine without outside air.
- the object of the invention is to develop a feed device for introducing molten steel from a header tank into a continuous casting machine in the form of a double belt casting machine (twin belt casting machine) with casting belts arranged in pairs and adjoining link walls in the form of insulating block chains.
- the feed device should have a readily preheatable pouring body, which can also compensate for changes in dimensions occurring on the front container and which, moreover, can be moved with respect to the double belt casting machine in such a way that geometric conditions exist between the mouthpiece and the mold walls surrounding it even during a prolonged casting process can be maintained, which ensure a secure seal between the mold walls and the mouthpiece of the pouring body:
- the pouring body of the feed device which is rotatably held about a horizontal pivot axis and is also laterally adjustable transversely to its longitudinal extent, is designed with its own carriage as a pouring unit, which can be moved separately from the front container and from the continuous casting machine in the form of a known double-belt casting machine with mold walls moving exclusively in the casting direction.
- the casting body is on the front container a ball joint. connectable, the ball socket or ball pin forming a connecting surface each belonging to different parts, namely the front container and the casting body.
- the invention thus conveys the teaching of moving the separation point between the two parts which can be moved relative to one another - namely the front container and the casting body of the feed device - into the ball joint.
- the possibilities of movement of the cast body with respect to its slide i.e. the rotatability about a horizontal pivot axis and the lateral adjustability transversely to the longitudinal extent) enable an exact alignment with respect to the downstream double belt casting machine.
- the casting body After the casting body has been preheated from the side of its mouthpiece, it can be moved in the direction of the double belt casting machine in such a way that between the mouthpiece and the mold walls delimiting a casting cavity, a narrow sealing gap which is as constant as possible on all sides, normally in the order of 0.3 to 1 mm is present.
- the front container can be moved by a vehicle receiving it, equipped with a drive and movable in a guide.
- the front container is preferably height-adjustable in that the vehicle has wheel sets supported by eccentric bushings on the vehicle frame.
- the range of motion of the pouring unit with respect to the double belt casting machine and that of the attachment container with respect to the pouring unit is dimensioned such that the pouring body can be preheated from its mouthpiece and the attachment container can be preheated from its connecting surface by means of burners which can be moved in its area (claim 2); these can each be moved about a fixed axis into a working and a rest position via a swivel arm.
- the cast-in body is supported on its slide in the manner of a rocker by means of a weight compensation - preferably consisting of a buffer with a variable spring characteristic (claim 4) (claim 3).
- a weight compensation preferably consisting of a buffer with a variable spring characteristic (claim 4) (claim 3).
- the support of the castor body, which is rotatable about the horizontal pivot axis, on the buffer forming a flexible abutment has the result that the mouthpiece can perform compensating movements in the vertical direction within the moving mold walls, thereby reducing the risk of damage to the parts which are moved relative to one another.
- the casting body can be supported outside of its pivot axis on a lockable tilt eccentric arranged on the slide; furthermore, the casting body has on its underside a metallic centering part with bevelled side surfaces, via which it can be threaded between the lateral mold walls - which protrude beyond the other mold walls against the casting direction (claim 5).
- the separation point between the front container and the casting body is preferably designed such that the latter has a connecting surface designed as a spherical socket (i.e. concavely curved) on the side facing the front container; the front container is accordingly equipped with a connection surface which is designed as a ball pin, d. H. is convexly curved. It has proven to be expedient to support the connecting surfaces forming the separation point against one another via a sealing compound made of plastic material (claim 6).
- This sealing compound - which has a pasty state in the temperature range between about 1 100 to 1 500 ° C - makes it possible to let the steel melt run into the double belt casting machine shortly after the two connecting surfaces have moved together through the casting body; it is composed of the essential components Si0 2 , Al z 0 3 , B z 0 3 , CaO, Na 2 0 and K 2 0, ordered according to the size of the proportions (claim 7).
- a plastic sealant with the following composition is preferably used: Si0 2 - 60%; A1 2 0 3 - 14%; B 2 0 3 - 10%; Ca0 - 7%; Na20-5% and K 2 0 -4%.
- the ceramic inner lining of the casting body is supported on an external steel jacket by means of a thermal insulation layer designed as a spring element, so that it can perform compensating movements to a small extent with respect to the steel jacket (claim 8).
- a thermal insulation layer designed as a spring element
- the feed device according to the invention is particularly easy to handle for establishing a connection between the front container and the double belt casting machine if the mouthpiece of the casting body is first inserted somewhat lower than in the casting position between the mold walls of the double belt casting machine before the casting body - after the front container reaches its casting position has - is brought into the pouring position by resetting against the connection surface of the front container, forming an externally closed connection.
- the advantage of this procedure can be seen in the fact that the heavy front container is moved into its pouring position and held there before the coupling mentioned is carried out via the considerably lighter casting body - which is already threaded into the double belt casting machine.
- the feed device according to the invention with a tubular casting body 1 works together with an upstream header tank 2 (tundish), the melting space 4 of which is delimited by a multilayered side wall 3 and merges downwards into a floor stone 5 and then into a floor channel 6. This is delimited by three successive, firmly connected stones 7, 8 and 9, of which the latter two protrude towards the casting body 1 and a downstream double belt casting machine 10 (twin belt casting machine).
- molten steel is fed from the front container 2, avoiding air access through the bore 5 'of the base stone 5.
- a stopper rod 11 is held adjustable in height, which can close the bore 5 'or release it for the flow.
- the front container 2 with the interchangeably attached stones 8 and 9 can be moved and adjusted in height via a driven vehicle (shown in FIGS. 5 and 6).
- the connection surface 9 'of the stone 9 facing the casting body 1 is designed as a ball pin, i. H. it is convexly curved.
- the initial section 12 of the two-part casting body 1 has as essential components a ceramic inner lining 13 with a pouring hole 14 adjoining the floor channel 6, a heat insulating layer 15 surrounding the inner lining and a rectangular steel jacket 16 serving as a supporting element.
- the heat insulating layer 15 is designed as a resilient spring element.
- a mouthpiece 19 which tapers in the casting direction (arrow 18) and which is essentially composed of a thin metal jacket 17 and a ceramic inner lining 13 'with a partially tapering casting hole 14'.
- the metal jacket 17 preferably consists of a nickel-chromium compound with the essential constituents: 73% Ni, 20% Cr, 1% Co, 5% Fe, 1% Co and traces of Cu, Al, Ti, C (all in all 1 %).
- the mouthpiece 19 protrudes with its end section and its outlet cross section 19 'between the mold walls of the double belt casting machine 10 which are moving in the casting direction and which consist of endless casting belts 20 or pairs (not shown) lying laterally adjacent to these continuous insulating block chains.
- the four mold walls mentioned delimit a rectangular casting cavity 21, the longitudinal axis of which - like the longitudinal axis 1 'of the casting body 1 - is inclined by 6 ° with respect to the horizontal; the inclination of the casting cavity 21 is provided in order to be able to empty the double belt casting machine.
- the movement of the casting belts 20 is indicated by arrows 20 '.
- the ceramic inner lining 13 of the starting section 12 is formed on its side facing the front container 2 as a concavely curved connection surface 13 ", which as a ball socket forms a ball joint with the convexly curved connection surface 9 'of the stone 9 serving as a ball pin.
- the connection surface 13" forms with the Pad 9 ' a separation point via which the front container 2 and the pouring body 1 can be connected to one another with the interposition of a sealing compound 22 applied to the connecting surface 9 '.
- the casting body 1 is rotatably held in a slide 24 with a housing 25 via a horizontal pivot axis 23 (see FIGS. 2 and 3).
- the pouring unit essentially formed from parts 1 and 24 is supported on a guide track (not shown) via a lateral guide (i.e. on the right in FIG. 3).
- the pivot pin 23 '(on the right in FIG. 3) of the pivot axis 23 is provided outside the area of the associated bearing bush 26 with a rectangular groove 23 "into which the adjustment head 27' of a side adjustment screw 27 engages with lateral play; this in turn is supported their threaded section in an adjustment housing 28 connected to the bearing bush 26.
- the cast-in body supported on the pivot axis 23 can be laterally displaced within the housing 25 and can be held in the desired lateral position, roughly adjusted with regard to the alignment of the mouthpiece (cf. FIG. 1) in the cold state with respect to the insulating block chains 20 ′′ serving as lateral mold walls, which protrude against the casting direction over the mold walls 20 designed as casting belts. There is approximately one mm of freedom of movement for hot alignment.
- this is laterally (cf. in particular FIG. 3) equipped with a rigidly attached rocker arm 29 which projects beyond the housing 25 to the left and which rests on an elastically supported buffer 30; this is movably supported in a housing 31 via a spring element in the form of a package 32 of disc springs.
- the biasing force of the spring element can be increased or decreased by means of a biasing screw 33.
- the housing 31 is in turn attached to a side bracket 34 of the housing 25.
- an inclination eccentric 35 is attached, which as essential components comprises a support arm 36 held immovably, a bearing bush 37, an eccentric bushing 38 with an eccentric disk 38 'and a lever 39 which enables the adjustment of the inclination eccentric.
- the eccentric disk 38 ' can be brought into contact with the already mentioned rocker arm 29.
- the inclined position of the casting body 1 with respect to the housing 25 can be changed continuously over a wide range.
- the position of the eccentric bushing 38 with respect to the support arm 36 can be secured in a simple manner in that a locking screw 40 extending through the parts 38 and 37 is braced against the support arm 36.
- the pouring body of the feed device according to the invention thus has an inclination adjustment in addition to the buffer 30 to facilitate the threading process.
- the position of the inclination eccentric 35 and the buffer 30 with respect to the housing 25 can be seen in particular from FIG. 2; in the pouring position, the mouthpiece 19 protrudes at an angle of 6 ° into the casting cavity 21 formed by the mold walls 20 and 20 ", the longitudinal axis 1 'of the casting body 1 coinciding with the longitudinal axis of the casting cavity.
- the advantage of the described embodiment is that the pouring body 1 can be brought into a position beforehand by pivoting the lever 39, which enables the mouthpiece 19 to be threaded effortlessly.
- a metallic centering part 41 with finely machined, bevelled side surfaces 41 ' is attached below the casting body 1.
- the side surfaces 41 'come into the region of the projecting lateral mold walls 20 "and bring the pouring body 1 into the required lateral position, in which the centering part 41 finally lies between the mold walls 20".
- only the carriage 24 has to be moved in the direction of the double belt casting machine (i.e. to the right in FIG. 2).
- the pivot axis 23 is then - seen in the casting direction - in front of the end edge 13 '"and thus in front of the concave connection surface 13" shown in FIG. 1, which forms the ball socket of the ball joint.
- the center of the casting body 1 movable in the manner of a seesaw and the center of the ball of the ball joint are identical to one another.
- the pouring body 1 shown in simplified form, is movably connected to the slide 24 via the housing 25 with the horizontal pivot axis 23, which in turn is supported on a stationary guide so as to be movable in both directions; this essentially consists of guide rods 42 guided one below the other and parallel to one another and a guide frame 43 supporting them.
- the embodiment in question is formed in the same way as that of FIGS. 2 to 4.
- the front container is detachably fastened to a vehicle 44, the wheel sets 45 of which are equipped with eccentric bushings (not shown) and are height-adjustable with respect to the vehicle frame 46 - indicated by the double arrow 46 '.
- the vehicle 44 can be moved along a guideway 48 in the direction of the double arrow 49 by means of a hydraulic cylinder 47, which is connected to the vehicle as well as to the surroundings in an articulated manner.
- a steel pan 50 is held movably above the front container 2. This must cooperate with the front container 2 during the casting process in such a way that air access to the molten steel from the outside is excluded with certainty. This can be achieved in a manner known per se in that the steel pan 50 engages sufficiently deep into the front container via an immersion tube 51 with outlet openings 51 'and in that its molten pool level is covered to the outside by a layer of slag.
- a burner 52 or 53 can be swiveled in.
- the pouring body 1 can be preheated from the side of its outlet cross section 19 'or the bottom channel 6 of the front container 2 from the connection surface 9' without difficulty.
- At least one additional burner 54 is also assigned to the front container 2, via which the melting chamber 4 of the front container can also be preheated directly.
- All of the burners 52 to 54 are held on pivot arms 52 ', 53' and 54 'so that they can be moved transversely to the plane of the drawing from a rest position to the illustrated position.
- the floor channel 6 is shown as a component of only the stone 9 with the connection surface 9 '.
- the feed device for steel casting according to the invention is expediently handled as follows: starting from the preheating position shown in FIG. 5, the sufficiently preheated casting body 1 is turned by turning the eccentric 38 'into its inclined position, which enables it to be threaded between the lateral mold walls 20 "(ie the insulating block chains) brought and then move by moving its carriage 24 a few millimeters further than this corresponds to the casting position (shown in Fig. 6) in the direction of the double belt casting machine 10; the outlet cross section 19 'of the mouthpiece 19 thus projects deeper than in this intermediate position necessary for operation between the mold walls 20 and 20 ".
- the front container 2 the stone 9 of which has been coated with a layer of a pasty sealing compound 22 in the region of the convex connecting surface 9 'serving as ball stud, is brought in the direction of the pouring body 1 into the intended pouring position and clamped there. Thereafter, the carriage 24 is sensitively set back against the front container so far that the connecting surfaces 9 'and 13 "are supported against one another by the layer of sealing compound 22 and thus form a ball joint sealed to the outside. Immediately after the connection between the casting body 1 and the front container has been formed 2, the casting process can be initiated by lifting the stopper rod 11 (cf. FIG. 1).
- the seal between the mouthpiece 19 of the casting body 1 and the mold walls 20 and 20 "surrounding it is ensured by maintaining a narrow sealing gap which is approximately 0. Is 3 mm.
- the advantage that is achieved by moving to an intermediate position of the casting body is that the attachment container 2, which has a considerable mass and is consequently difficult to handle, can be brought undisturbed into its pouring position before the lighter pouring body 1 is sensitive to the attachment container while avoiding damage is moved up.
- the sensitive alignment of the casting body 1 with respect to the mold walls 20 and 20 "and the maintenance of a tight sealing gap which is as constant as possible is also particularly important when the molten steel is poured under pressure.
- the molten bath level inside the front container 2 is constantly at a level which lies above the outlet cross section 19 'in the double belt casting machine 10.
- the die casting process presupposes that the seal between the casting body and the mold walls withstands the increased metallostatic pressure in this area, since the casting body 1 in the casting position simultaneously via its pivot axis 23 and via the ball joint is held with the connecting surfaces 9 'and 13 ", but as the pouring time progresses, an extension of the suspended front container 2 (and thus a movement of the stone 9 downwards) is to be expected, it may be of considerable importance that the ceramic inner excl divide 13 can perform a compensatory movement within the steel jacket 16 against the resilient heat insulation layer 15.
- the heat insulating layer 15 preferably consists of aluminum oxide fibers, aluminum silicate fibers and an organic binder (chemical composition: 72% A1 2 0 3 , 21% Si0 2 , the rest of the binder). Above a temperature of about 400 ° C, the binder changes into the gaseous state, so that the heat insulation layer then only consists of the components A1 2 0 3 and Si0 2 exists.
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT84102964T ATE25014T1 (de) | 1983-03-26 | 1984-03-17 | Zufuehreinrichtung zum einbringen von stahlschmelze in stranggiessemaschinen mit in giessrichtung bewegten kokillenwaenden. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3311090A DE3311090C2 (de) | 1983-03-26 | 1983-03-26 | Zuführeinrichtung zum Einbringen von Stahlschmelze in Doppelbandgießmaschinen |
DE3311090 | 1983-03-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0123121A1 EP0123121A1 (fr) | 1984-10-31 |
EP0123121B1 true EP0123121B1 (fr) | 1987-01-21 |
Family
ID=6194766
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84102964A Expired EP0123121B1 (fr) | 1983-03-26 | 1984-03-17 | Installation de chargement pour alimenter en acier fondu des machines de coulée en continu dont les parois de lingotière se déplacent dans le mDme sens que la direction de coulée |
Country Status (7)
Country | Link |
---|---|
US (1) | US4544018A (fr) |
EP (1) | EP0123121B1 (fr) |
JP (1) | JPS59183959A (fr) |
AT (1) | ATE25014T1 (fr) |
AU (1) | AU2553984A (fr) |
CA (1) | CA1218512A (fr) |
DE (1) | DE3311090C2 (fr) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3328586C2 (de) * | 1983-08-08 | 1985-09-05 | Didier-Werke Ag, 6200 Wiesbaden | Feuerfeste Kanalverbindung für Horizontal-Stranggießanlagen |
DE3415235C2 (de) * | 1984-04-21 | 1986-04-03 | Fried. Krupp Gmbh, 4300 Essen | Zuführeinrichtung zum Einbringen von Stahlschmelze in Doppelbandgießmaschinen |
JPS6220753U (fr) * | 1985-07-19 | 1987-02-07 | ||
JPS63303661A (ja) * | 1987-01-22 | 1988-12-12 | Ishikawajima Harima Heavy Ind Co Ltd | 注湯装置 |
JP2710946B2 (ja) * | 1988-03-23 | 1998-02-10 | 日立金属株式会社 | 薄帯の連続鋳造装置 |
US4830089A (en) * | 1988-05-05 | 1989-05-16 | Hazelett Strip-Casting Corporation | Method and apparatus for setting precise nozzle/belt and nozzle/edge dam block gaps |
JPH01309761A (ja) * | 1988-06-08 | 1989-12-14 | Ishikawajima Harima Heavy Ind Co Ltd | 移動鋳型式連続鋳造機の注湯装置 |
JPH01313158A (ja) * | 1988-06-10 | 1989-12-18 | Ishikawajima Harima Heavy Ind Co Ltd | 連続鋳造設備における注湯ノズル芯出し装置 |
US4915270A (en) * | 1988-07-13 | 1990-04-10 | Usx Corporation | Low-head feeding system for thin section castings |
ES2123743T3 (es) * | 1993-05-18 | 1999-01-16 | Pechiney Rhenalu | Maquina para la colada en banda de metales. |
ATE305834T1 (de) * | 2003-08-01 | 2005-10-15 | Hof Te Fiennes N V | Giesssystem und verfahren zum vergiessen von ne- metallschmelzen |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE344694B (fr) * | 1967-09-08 | 1972-05-02 | Ashmore Benson Pease & Co Ltd | |
CH503531A (de) * | 1970-07-03 | 1971-02-28 | Prolizenz Ag C O Schweiz Kredi | Maschine mit horizontaler oder geneigt angeordneter Raupenkokille zum Abwärtsstranggiessen von Nichteisenmetallen |
US3746072A (en) * | 1971-01-20 | 1973-07-17 | Southwire Co | Method of pouring molten metal |
US3921697A (en) * | 1973-03-22 | 1975-11-25 | Hazelett Strip Casting Corp | Method and apparatus for controlling the operating conditions in continuous metal casting machines having a revolving endless casting belt |
DE2800503A1 (de) * | 1977-01-27 | 1978-08-03 | Uss Eng & Consult | Vorrichtung zum anbringen eines giessrohres fuer einen giessbehaelter |
US4244420A (en) * | 1978-05-17 | 1981-01-13 | Davy-Loewy Limited | Apparatus for feeding a horizontal continuous casting mold |
DE3009189B1 (de) * | 1980-03-11 | 1981-08-20 | Mannesmann Demag Ag, 4100 Duisburg | Verfahren zum Horizontalstranggiessen von fluessigen Metallen,insbesondere von Stahl,und Einrichtung dazu |
US4487251A (en) * | 1982-03-08 | 1984-12-11 | Vesuvius Crucible Company | Continuous casting apparatus and a method of using the same |
-
1983
- 1983-03-26 DE DE3311090A patent/DE3311090C2/de not_active Expired
-
1984
- 1984-03-13 AU AU25539/84A patent/AU2553984A/en not_active Abandoned
- 1984-03-17 EP EP84102964A patent/EP0123121B1/fr not_active Expired
- 1984-03-17 AT AT84102964T patent/ATE25014T1/de not_active IP Right Cessation
- 1984-03-21 US US06/592,457 patent/US4544018A/en not_active Expired - Fee Related
- 1984-03-23 CA CA000450368A patent/CA1218512A/fr not_active Expired
- 1984-03-26 JP JP59056412A patent/JPS59183959A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
CA1218512A (fr) | 1987-03-03 |
US4544018A (en) | 1985-10-01 |
ATE25014T1 (de) | 1987-02-15 |
JPS59183959A (ja) | 1984-10-19 |
EP0123121A1 (fr) | 1984-10-31 |
DE3311090C2 (de) | 1985-04-04 |
AU2553984A (en) | 1984-09-27 |
DE3311090A1 (de) | 1984-10-04 |
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