EP0058324A2 - Dispositif pour le refroidissement réglé d'un fil à température de laminage - Google Patents

Dispositif pour le refroidissement réglé d'un fil à température de laminage Download PDF

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Publication number
EP0058324A2
EP0058324A2 EP82100662A EP82100662A EP0058324A2 EP 0058324 A2 EP0058324 A2 EP 0058324A2 EP 82100662 A EP82100662 A EP 82100662A EP 82100662 A EP82100662 A EP 82100662A EP 0058324 A2 EP0058324 A2 EP 0058324A2
Authority
EP
European Patent Office
Prior art keywords
modules
wire
conveyor
cooling
turns
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.)
Granted
Application number
EP82100662A
Other languages
German (de)
English (en)
Other versions
EP0058324A3 (en
EP0058324B1 (fr
Inventor
Johann Grotepass
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Schloemann Siemag AG
Schloemann Siemag AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6124935&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0058324(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by SMS Schloemann Siemag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Priority to AT82100662T priority Critical patent/ATE9548T1/de
Publication of EP0058324A2 publication Critical patent/EP0058324A2/fr
Publication of EP0058324A3 publication Critical patent/EP0058324A3/de
Application granted granted Critical
Publication of EP0058324B1 publication Critical patent/EP0058324B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/26—Special arrangements with regard to simultaneous or subsequent treatment of the material
    • B21C47/262—Treatment of a wire, while in the form of overlapping non-concentric rings

Definitions

  • the controlled cooling of (steel) wire rod from the rolling heat has become of considerable importance in the last two decades due to the introduction of the so-called "Stelmor process".
  • the wire leaving the rolling mill is fed directly to a cooling device, which consists of a first part, which guides the wire in a straight line and in sections with water, a part which forms the wire into turns and which offset the turns against one another on a continuously running conveyor laying lay and the conveyor, which allows an approximately vertically directed coolant flow to pass through and access to all winding parts, consists as a second part, the Conveyor of the second part of the cooling device which feeds the wire windings to a bundle forming station which collects and forms them into bundles.
  • the structure and cooling intensity in the two parts of the cooling device are based on the type of steel and the diameter of the wire to be cooled and the throughput.
  • DE-PS 1 508 443 discloses an early proposal for increasing the adaptability of the cooling device to widely differing cooling conditions. According to this proposal, the winding layer can be adjusted along the device and thus the effective lengths of the first and second parts of the cooling device can be changed during the basic structure of the cooling device in both parts corresponds to the rest of the state of the art and here, as there, can hardly be changed or can only be changed at high cost.
  • both parts of the cooling device are composed of a plurality of modules of the same basic length or an integral multiple of the basic length and built on a base frame on which the winding layer is also arranged and fixed in the longitudinal direction. is, the modules or groups of modules differ in their management or support function and / or influence the cooling effect differently.
  • the modules of the first part of the cooling device are provided with the wire straight pipe pieces according to a feature of the invention and according to a further feature of the invention, the pipe pieces can be provided with cooling water supplies and combined by a collecting container for the cooling water running off.
  • the modules of the second part of the cooling device are designed as basic units of a conveyor for the transport of wire windings which are offset on it in the conveying direction, the conveying means of which permit an approximately vertically directed cooling air flow to pass through and access to all parts of the wire windings.
  • the hot wire windings on the conveyor generate a thermal which is sufficient if only moderate cooling speeds are required. Very high cooling rates can be achieved, if each module of the conveyor placed underneath a frame with vertically operating fan wheels according to a further feature of the invention - is. In most cases, it is sufficient if, according to a further feature of the invention, an air chamber fed by a blower is placed under several modules of the conveyor, a high cooling rate being achievable.
  • a known and practiced way of influencing the cooling speed is to deposit the wire windings with more or less little dislocation on the conveyor by adjusting the conveying speed accordingly. If the cooling conditions require that a period of rapid cooling should be followed by a period of slow cooling, for which purpose the wire windings should be placed closer together, or if the wire windings have to be pulled apart for trouble-free ejection into the coil forming station, this can be done particularly easily in the cooling device according to the invention achieve, according to a further feature of the invention, modules that are upstream of a section of the conveyor or belong to higher modules compared to subsequent modules of a section of the conveyor operated at a different conveying speed, which is achieved in the simplest way by documents between the modules and the base frame .
  • the cooling speed is to be reduced further, this can be done by restricting the cooling air flow and further by preventing the heat radiation.
  • the frame for the fan wheels or the air chambers, plates made of the heat radiation-insulating building material, with slots for are provided the passage of a cooling air flow, this has the desired effect that the heat radiation is prevented downwards and a non-forced air movement is braked, while the slots allow a cooling air flow forced by fans or fans, so that the plates except in the case thermal cooling can remain under the modules.
  • the modules of the conveyor can be fitted with plates made of the heat radiation-insulating building material on the inner walls facing the longitudinal sides of the conveyor and on the modules U -shaped hoods from the heat radiation insulating building material can be placed as sections of a warming tunnel.
  • Fig. 1, 1 denotes the last pair of rolls of a wire rolling mill.
  • the finished rolled wire leaving the pair of rolls 1 enters the cooling device directly, which consists of a first part A and a second part B, which in turn is divided into sections B1, B2 and B3.
  • a driving roll stand 2 and a winding layer 3 is arranged between the two parts A and B '.
  • a bundle forming station 4 connects to part B or the last section B3 of the cooling device.
  • the first part A of the cooling device which guides the wire in a straight line, is composed of modules 5 and 6.
  • the modules 5 and 6 are provided with pipe sections 7 for wire guidance, which are combined in the modules 5 by a collecting container 8 and in the modules 6 by a support beam 9, the pipe sections 7 of the modules 5 being not shown here, for example by the DE-PS 27 14 019 known cooling water supplies are provided.
  • the collecting containers 8 of the modules 5 are made of bases 10 and the support beams 9 of the modules 6 are made of bases 11 gene, which in turn sit on a base frame 14 of the cooling device and are releasably attached.
  • Modules 5 and 6 are designed in two basic lengths.
  • a base 12 of simple basic length carrying the drive roller stand 2 and the bearing housing 13 of the winding layer 3 of double basic length sit on the base frame 14 following the bases 10 and 11 and are also detachably fastened to this.
  • the winding layer 3 forms the wire into turns in the form of screws and places them on the subsequent conveyor in the second part of the cooling device. Depending on the conveying speed of the continuously operated conveyor, the turns lay more or less offset on the conveyor.
  • the conveyor that is to say the second part B of the cooling device, is composed of modules 15 as basic units of the conveyor.
  • the modules 15 consist of a frame 16 with fastening flanges 17.
  • the frame 16 is open at the top and bottom.
  • Transport rollers 18 are mounted in the longitudinal side walls of the frame 16.
  • the shafts of the transport rollers 18 are guided out of the frame 16 on a longitudinal side thereof.
  • a shaft in each module 15 is driven by a gear motor 19.
  • Sprockets and chains 20 seated on the shaft journals serve for the geared connection of all the transport rollers 18 of a module 15.
  • the conveying speed of each module is infinitely variable.
  • the second part B of the cooling device is subdivided into sections B1, B2 and B3 in order to be able to meet the required cooling conditions assumed here, which is very fast in section B1 Require cooling.
  • the modules 15 of this section are regulated on the one hand to a high conveying speed, so that the windings are offset strongly (over 35 mm), that is to say they are widely separated, and on the other hand the modules 15 are combined with fans 21 to generate a very strong air flow (see FIG . 2).
  • the fans 21 are mounted in frames 22, which have the same connection dimensions as the modules 15 and are placed underneath them together with the modules 15 on the base frame 14 and fastened.
  • the modules 15 together with the fans 21 in the frame 22 provide a cooling intensity in the case of strongly offset windings which is suitable for continuing the strong initial cooling started in the first part A of the cooling device with sufficient intensity.
  • This has the advantage that the first part A of the cooling device is kept correspondingly short and the turns can be laid at about 850 ° C.
  • a short distance between the last roll stand and the winding layer with a correspondingly high temperature of the wire in the winding layer are essential prerequisites for a high final rolling speed of 75 and more m / sec.
  • the design of the cooling device according to the invention allows, however, in cases where a particularly low temperature (800 ° C.
  • section B2 Following the very rapid cooling in section B1, rapid cooling is sufficient, which is ensured in section B2 by placing an air chamber 23 below it, for example three modules 15, which is fed by a blower 24 (see FIG. 3).
  • the modules 15 sit on the air chambers 23 and with them on the base frame 14.
  • the air blown into the chambers 23 exits the modules 15 between the rollers 18.
  • the cooling speed sought in section B2 can be achieved with an average offset of the turns (approximately 20 to 30 mm), and the modules 15 in section B2 are therefore regulated to an average conveying speed.
  • the modules 15 in section B2 are set somewhat lower than in section B1, which is indicated by documents of different thickness, namely documents 24 for modules 15 in sections B1 and less strong documents 25 for the modules 15 in section B2 is reached: the modules 15 in section B3 also sit on an air chamber 23 and with this on the base frame 14.
  • the conveying speed of the modules 15 in section B3 is, however, adapted to that for the transfer of the turns into the bundle forming station 4, which is somewhat higher than the conveying speed in section B2.
  • the modules 15 in section B3 are set lower than in section B2 in that the modules 15 in section B3 are mounted without documents.
  • the modules 15 can be placed directly on the base frame 1-4 (see FIG. 4).
  • the inherent heat of the wire windings conveyed on the modules 15 causes an air movement (thermals), which causes a moderate cooling rate.
  • the moderate cooling rate caused by natural air movement (thermals) and heat radiation_ is still too high in the cooling conditions of a group of steels.
  • the modules 15 can be closed at the bottom by underlaid panels 26 (see FIGS. 5, 6 and 7).
  • the plates 26 are provided with slots 27 which expediently increase in the conveying direction.
  • the ribs remaining between the slots 27 have a braking effect on an air flow to such an extent that the natural air movement is greatly reduced.
  • the downward heat radiation is largely insulated by the plates 26, even if they are provided with slots 27.
  • the braked air movement and the partial, downward-insulated heat radiation ensure slow cooling.
  • the plates 26 consist of heat-resistant and heat-insulating material.
  • the slots 27 in the plates 26, however, allow an air flow forced by fans or blowers to become fully effective when the plates 26 between the frames 22 of the fans 21 and the modules 15 (see FIG. 5) or between the ventilation chambers 23 and the modules 15 (see FIG. 6) are set, the slots 27, with their inclined position, simultaneously directing the air flow in a desired direction.
  • the modules 15 are equipped with plates 28 along the inner walls of the long sides, which are connected to the inner walls and provided on their upper surfaces located at the level of the axes of the transport rollers 18 with semicircular recesses 29 of a somewhat larger radius than that of the transport rollers 18 are.
  • 15 hoods 30 are placed on the modules, the side walls 31 of which are supported on the plates 28 and, like these, are provided with semicircular cutouts 32 (see FIG. 8). While the plates 28 can remain in the modules 15, the hoods 30 are only placed on the modules 15 as required.
  • FIG. 1 The exemplary embodiment shown in FIG. 1 with the omission of part of the modules 15 in section B2 is shown again completely in FIG. 9, but schematically with the omission of the roll stand upstream of the cooling device and the coil forming station downstream of the cooling device and of the base frame.
  • FIG. 10 shows a cooling device which is of a very simple design, as it can be used for different types of bulk steels which, in the case of strong initial cooling in the first part C, require only moderately rapid cooling in the second part D.
  • a construction of the cooling device as shown in FIG. 1.0 can, however, be suitable as a first construction stage, since the design according to the invention allows the cooling device to be converted without further ado.
  • the cooling device As shown in FIG. 11, the first part E of the cooling device is shortened compared to the structure according to FIG. 10, while the second part F is correspondingly lengthened and equipped for strong cooling by air chambers 23 with fans 24 - as shown in FIG. 3 - under the modules 15. are set.
  • Very high rolling speeds require a further shortening of the first section of the cooling device, and the construction according to FIG. 9 is recommended, which allows very strong cooling in section B1, as already described. Since the very strong cooling in section B1 is effected with wire of small cross-section, it is advisable to convert the cooling device into the structure according to FIG. 11 when rolling out wire of larger cross-section, which is anyway rolled at a lower final speed.
  • a cooling device according to the invention - in the example that according to FIG. 9 - can be easily set up for very slow cooling, once the modules 15 are underlaid with plates 26 and plates 28 are inserted into the modules 15. Then it is only necessary to put on the hoods 30 and to shut down the fans 21 and the blowers 24.
  • the modules 15 in sections B1 and B2 are also to be regulated to a low conveying speed, so that there is a tight packing of the wire windings with a small offset (down to 3 mm).
  • the cooling device according to FIG. 12 has the same effect as that according to FIG. 9.

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  • 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)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Metal Rolling (AREA)
  • Laminated Bodies (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)
EP82100662A 1981-02-14 1982-01-30 Dispositif pour le refroidissement réglé d'un fil à température de laminage Expired EP0058324B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82100662T ATE9548T1 (de) 1981-02-14 1982-01-30 Vorrichtung zum geregelten kuehlen von walzdraht aus der walzhitze.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3105492 1981-02-14
DE3105492A DE3105492C1 (de) 1981-02-14 1981-02-14 Vorrichtung zum geregelten Kuehlen von Walzdraht aus der Walzhitze

Publications (3)

Publication Number Publication Date
EP0058324A2 true EP0058324A2 (fr) 1982-08-25
EP0058324A3 EP0058324A3 (en) 1983-03-23
EP0058324B1 EP0058324B1 (fr) 1984-09-26

Family

ID=6124935

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82100662A Expired EP0058324B1 (fr) 1981-02-14 1982-01-30 Dispositif pour le refroidissement réglé d'un fil à température de laminage

Country Status (7)

Country Link
US (1) US4375884A (fr)
EP (1) EP0058324B1 (fr)
JP (1) JPS57152312A (fr)
AT (1) ATE9548T1 (fr)
BR (1) BR8200754A (fr)
DE (2) DE3105492C1 (fr)
ES (1) ES8301127A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0169827A1 (fr) * 1984-07-23 1986-01-29 Arbed S.A. Procédé pour fabriquer du fil machine en acier dur
EP0110652B1 (fr) * 1982-11-22 1987-06-16 MORGAN CONSTRUCTION COMPANY (a Massachusetts corporation) Appareil et procédé de laminage et traitement d'acier en barres
WO1991000368A1 (fr) * 1989-07-03 1991-01-10 Centre De Recherches Metallurgiques Procede et dispositif de refroidissement continu d'un fil d'acier trefile
EP0554733A1 (fr) * 1992-02-04 1993-08-11 Sms Schloemann-Siemag Aktiengesellschaft Dispositif pour le refroidissement contrôlé d'un fil à température de laminage
EP0849369A2 (fr) * 1996-12-19 1998-06-24 Sms Schloemann-Siemag Aktiengesellschaft Procédé pour le traitement thermique de fil ou de barres en acier pendant l' enroulement en bobines

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4546957A (en) * 1982-11-22 1985-10-15 Morgan Construction Company Apparatus for combined hot rolling and treating steel rod
JPS59157716U (ja) * 1983-04-07 1984-10-23 新日本製鐵株式会社 圧延鋼線材の冷却装置
DE3327815C2 (de) * 1983-08-02 1989-07-20 Mannesmann AG, 4000 Düsseldorf Verfahren und Vorrichtung zur Durchführung des Verfahrens zum Fördern von Längen von Walzdraht
NO166455C (no) * 1984-09-07 1991-07-31 Sumitomo Electric Industries Fremgangsmaate og anordning for direkte varmebehandling aven staalstang med middels til hoeyt karboninnhold.
US5121902A (en) * 1984-10-09 1992-06-16 Morgan Construction Company Apparatus for cooling hot rolled steel rod using a plurality of air and water cooled sections
US5299783A (en) * 1991-04-30 1994-04-05 Engineered Production Increase, Inc. Rod cooling apparatus
US5871596A (en) * 1997-04-08 1999-02-16 Morgan Construction Company Apparatus and method for cooling hot rolled steel rod

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2009839A1 (de) * 1969-03-05 1970-09-24 Wendel-Sidelor, Hayange (Frankreich) Verfahren und Vorrichtung zur Wärmebehandlung eines.Stahldrahtes
DE1752519C (de) * 1971-11-18 Schloemann AG, 4000 Düsseldorf Einrichtung zum Kühlen von Walzdraht
DE2150609A1 (de) * 1970-10-16 1972-05-25 Morgan Construction Co Verfahren zum Abkuehlen und Weichgluehen von Stahldraht
US3865153A (en) * 1973-12-03 1975-02-11 Morgan Construction Co Metal treatment apparatus for steel rod having an oscillating platform below the laying head
US3930900A (en) * 1974-10-21 1976-01-06 Morgan Construction Company Process for cooling hot rolled steel rod
US3940967A (en) * 1975-01-10 1976-03-02 Morgan Construction Company Apparatus for controlled cooling hot rolled steel rod in direct sequence with rod mill
DE2714019C3 (de) * 1977-03-30 1980-08-07 Schloemann-Siemag Ag, 4000 Duesseldorf Vorrichtung zum Abkühlen von mit hoher Geschwindigkeit durch Führungsrohre laufenden Walzdraht

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735966A (en) * 1971-06-07 1973-05-29 Schloemann Ag Method for heat treating steel wire rod
US4054276A (en) * 1974-10-21 1977-10-18 Morgan Construction Company Process and apparatus for cooling hot rolled steel rod
US3940961A (en) * 1974-11-18 1976-03-02 Morgan Construction Company Apparatus for cooling hot rolled steel rod by forced air convection or by supplying heat
DE2536236C2 (de) * 1975-08-14 1985-01-03 Mannesmann AG, 4000 Düsseldorf Verfahren und Vorrichtung zum kontinuierlichen Patentieren von Walzdraht aus der Walzhitze

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1752519C (de) * 1971-11-18 Schloemann AG, 4000 Düsseldorf Einrichtung zum Kühlen von Walzdraht
DE2009839A1 (de) * 1969-03-05 1970-09-24 Wendel-Sidelor, Hayange (Frankreich) Verfahren und Vorrichtung zur Wärmebehandlung eines.Stahldrahtes
DE2150609A1 (de) * 1970-10-16 1972-05-25 Morgan Construction Co Verfahren zum Abkuehlen und Weichgluehen von Stahldraht
US3865153A (en) * 1973-12-03 1975-02-11 Morgan Construction Co Metal treatment apparatus for steel rod having an oscillating platform below the laying head
US3930900A (en) * 1974-10-21 1976-01-06 Morgan Construction Company Process for cooling hot rolled steel rod
DE2546589A1 (de) * 1974-10-21 1976-04-29 Morgan Construction Co Verfahren und anlage zum kontrollierten abkuehlen von warmgewalztem strahldraht
US3940967A (en) * 1975-01-10 1976-03-02 Morgan Construction Company Apparatus for controlled cooling hot rolled steel rod in direct sequence with rod mill
DE2714019C3 (de) * 1977-03-30 1980-08-07 Schloemann-Siemag Ag, 4000 Duesseldorf Vorrichtung zum Abkühlen von mit hoher Geschwindigkeit durch Führungsrohre laufenden Walzdraht

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0110652B1 (fr) * 1982-11-22 1987-06-16 MORGAN CONSTRUCTION COMPANY (a Massachusetts corporation) Appareil et procédé de laminage et traitement d'acier en barres
EP0169827A1 (fr) * 1984-07-23 1986-01-29 Arbed S.A. Procédé pour fabriquer du fil machine en acier dur
WO1991000368A1 (fr) * 1989-07-03 1991-01-10 Centre De Recherches Metallurgiques Procede et dispositif de refroidissement continu d'un fil d'acier trefile
EP0554733A1 (fr) * 1992-02-04 1993-08-11 Sms Schloemann-Siemag Aktiengesellschaft Dispositif pour le refroidissement contrôlé d'un fil à température de laminage
EP0849369A2 (fr) * 1996-12-19 1998-06-24 Sms Schloemann-Siemag Aktiengesellschaft Procédé pour le traitement thermique de fil ou de barres en acier pendant l' enroulement en bobines
EP0849369A3 (fr) * 1996-12-19 1998-07-08 Sms Schloemann-Siemag Aktiengesellschaft Procédé pour le traitement thermique de fil ou de barres en acier pendant l' enroulement en bobines
US5902422A (en) * 1996-12-19 1999-05-11 Sms Schloemann-Siemag Aktiengesellschaft Ferritic coiling of wire or bar steel

Also Published As

Publication number Publication date
BR8200754A (pt) 1982-12-21
EP0058324A3 (en) 1983-03-23
ES508738A0 (es) 1982-12-01
ATE9548T1 (de) 1984-10-15
JPS57152312A (en) 1982-09-20
ES8301127A1 (es) 1982-12-01
US4375884A (en) 1983-03-08
EP0058324B1 (fr) 1984-09-26
DE3260798D1 (en) 1984-10-31
DE3105492C1 (de) 1982-09-30

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