EP0080086A1 - Device for cooling flat rolled products - Google Patents

Device for cooling flat rolled products Download PDF

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Publication number
EP0080086A1
EP0080086A1 EP82110137A EP82110137A EP0080086A1 EP 0080086 A1 EP0080086 A1 EP 0080086A1 EP 82110137 A EP82110137 A EP 82110137A EP 82110137 A EP82110137 A EP 82110137A EP 0080086 A1 EP0080086 A1 EP 0080086A1
Authority
EP
European Patent Office
Prior art keywords
distributor
pipes
pistons
rolling stock
guided
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.)
Withdrawn
Application number
EP82110137A
Other languages
German (de)
French (fr)
Inventor
Kurt Eckelsbach
August Finken
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
Application filed by SMS Schloemann Siemag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Publication of EP0080086A1 publication Critical patent/EP0080086A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching

Definitions

  • the invention relates to a device for cooling flat rolling stock, in particular rolled strip, by means of laminar cooling water jets, distribution pipes being arranged transversely above or below the rolling stock pass, the walls of which are provided with bores over the maximum rolling stock width and are connected to the guide tubes.
  • the distributor pipes are connected at one end to a water supply line.
  • the outlet pipes are inserted in the upper openings of the distributor pipes and are guided downwards in an arc on both sides.
  • the range of effects resulting from the number and division of the guide tubes becomes designed according to the maximum rolling stock width. This has the disadvantage that with narrow rolling stock widths, a considerable part of the coolant flows uselessly onto the free side sections of the roller table.
  • the coolant wastage should be avoided with changing rolling stock widths.
  • the task is to create a cooling device whose range of action can be adjusted quickly and precisely to all rolling stock widths using simple means.
  • distributor pipes are provided with a water connection approximately in the middle of their jacket and pistons sealingly guided on both sides within the pipe jacket are adjustable in opposite directions.
  • the length of the water column within the distribution pipes is determined by adjusting the pistons. In this way, the exposure of water from guide tube to guide tube can be set exactly to the respective rolling stock width and the cooling water consumption can be reduced.
  • the pistons can advantageously be adjustable by means of a spindle with a right-hand and Ling thread that is guided centrally in outer tube covers.
  • the pistons are guided by means of bores on guide rods fastened in the tube covers and running parallel to the spindle.
  • hot rolled strips 1 are conveyed on an outfeed roller table 2 and cooled with water over a defined area on the top and bottom.
  • the cooling water is supplied through upper and lower water pipes 3, 4 which are attached to vertical supports 5.
  • Each upper water pipe 3 is connected to a distributor pipe 7 arranged transversely above the roller table 2 and laterally closed by cover 6 in the middle thereof.
  • the distributor pipe 7 is provided on the upper side with a plurality of guide pipes 8, which run downwards in an arc.
  • the distributor pipe 10 is provided on its upper side with straight guide pipes 11 directed towards the underside of the band.
  • Each lower water pipe 4 is connected to a distributor pipe 10 arranged below the roller table 2 and laterally closed by cover 9 in the middle thereof.
  • the cooling water flowing in through a nozzle 12 fills the distributor pipe 7 or 10, rises evenly through bores 13 on the upper side thereof into the guide pipes 8 or 11 and flows onto the rolled strip 1.
  • pistons 15, 16, each sealingly guided in the distributor tube 7 or 10 are guided on a right-hand or left-hand thread of a hand or motor-driven spindle 14 mounted in the covers 6 or 9.
  • a rod 17 fastened in the covers 6 and 9 runs through the distributor pipe 7 and 10, which penetrates the pistons 15, 16 as a means of preventing rotation.
  • Rotation of the spindle 14 moves the pistons 15, 16 in opposite directions, as a result of which the width of the water column located in the distributor pipe 7 or 10 between the pistons 15, 16 is changed.
  • the bores 13 located in the distributor pipes 7 and 10 can be separated from the water supply one after the other in order to adapt to narrower bands.
  • the invention is not restricted to the exemplary embodiment shown.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

Arranged transversely above and/or below the passage of rolled products are distributor pipes (7, 10) which are provided with bores (13), to which lead pipes (8, 11) are connected, over the maximum width of the rolled product. For the purpose of simple, rapid and precise setting of the effective width of the cooling device to the particular width of the rolled product, the distributor pipes (7, 10) are provided with a central water connection (12), plungers (15, 16) which can be adjusted in opposite senses being guided in a sealing fashion on both sides in the interior of the distributor pipes (7, 10). <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum Kühlen von flachem Walzgut,insbesondere Walzband, mittels laminarer Kühlwasserstrahlen, wobei quer über oder unter dem Walzgutdurchlauf Verteilerrohre angeordnet sind, deren Wandungen über die maximale Walzgutbreite mit Bohrungen versehen sind, an die Leitrohre angeschlossen sind.The invention relates to a device for cooling flat rolling stock, in particular rolled strip, by means of laminar cooling water jets, distribution pipes being arranged transversely above or below the rolling stock pass, the walls of which are provided with bores over the maximum rolling stock width and are connected to the guide tubes.

Bei dieser aus der DE-AS 21 01 664 bekannten Kühlvorrichtung sind die Verteilerrohre an einer Stirnseite an eine Wasserzuleitung angeschlossen. Die Austrittsrohre sind in oberen öffnungen der Verteilerrohre eingesetzt und an beiden Seiten in einem Bogen nach unten geführt. Die sich aus Anzahl und Teilung der Leitrohre ergebende Wirkungsbreite wird nach der maximalen Walzgutbreite ausgelegt. Dies hat den Nachteil, daß bei schmalen Walzgutbreiten ein beträchtlicher Teil des Kühlmittels nutzlos auf die frei gebliebenen Seitenabschnitte des Rollgangs fließt.In this cooling device known from DE-AS 21 01 664, the distributor pipes are connected at one end to a water supply line. The outlet pipes are inserted in the upper openings of the distributor pipes and are guided downwards in an arc on both sides. The range of effects resulting from the number and division of the guide tubes becomes designed according to the maximum rolling stock width. This has the disadvantage that with narrow rolling stock widths, a considerable part of the coolant flows uselessly onto the free side sections of the roller table.

Mit der Erfindung soll die Kühlmittelverschwendung bei wechselnden Walzgutbreiten vermieden werden. Aufgabe ist insbesondere die Schaffung einer Kühlvorrichtung deren Wirkungsbreite mit einfachen Mitteln schnell und genau auf alle vorkommenden Walzgutbreiten einstellbar ist.With the invention, the coolant wastage should be avoided with changing rolling stock widths. In particular, the task is to create a cooling device whose range of action can be adjusted quickly and precisely to all rolling stock widths using simple means.

Nach der Erfindung wird dies dadurch erreicht, daß die Verteilerrohre etwa in der Mitte ihres Mantels mit einem Wasseranschluß versehen sind und beidseits innerhalb des Rohrmantels dichtend geführte Kolben gegenläufig verstellbar sind.According to the invention, this is achieved in that the distributor pipes are provided with a water connection approximately in the middle of their jacket and pistons sealingly guided on both sides within the pipe jacket are adjustable in opposite directions.

Durch Verstellung der Kolben wird die Länge der Wassersäule innerhalb der Verteilerrohre bestimmt. Auf diese Weise kann die Wasserbeaufschlagung von Leitrohr zu Leitrohr exakt auf die jeweilige Walzgutbreite eingestellt und der Kühlwasserverbrauch reduziert werden.The length of the water column within the distribution pipes is determined by adjusting the pistons. In this way, the exposure of water from guide tube to guide tube can be set exactly to the respective rolling stock width and the cooling water consumption can be reduced.

Die Kolben können vorteilhaft durch eine in äußeren Röhrdeckeln zentral geführte Spindel mit Rechts- und Lingsgewinde verstellbar sein.The pistons can advantageously be adjustable by means of a spindle with a right-hand and Ling thread that is guided centrally in outer tube covers.

Gemäß einem weiteren Merkmal der Erfindung sind die Kolben mittels Bohrungen auf in den Rohrdeckeln befestigten, parallel zu der Spindel verlaufenden Führungsstangen geführt.According to a further feature of the invention, the pistons are guided by means of bores on guide rods fastened in the tube covers and running parallel to the spindle.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Es zeigen

  • Fig. 1 eine Bandkühlstrecke in Bandlaufrichtung gesehen,
  • Fig. 2 eine Seitenansicht zu Fig. 1 und
  • Fig. 3 einen vergrößerten Längsschnitt durch ein Verteilerrohr.
In the drawing, an embodiment of the invention is shown. Show it
  • 1 seen a strip cooling section in the strip running direction,
  • Fig. 2 is a side view of Fig. 1 and
  • Fig. 3 is an enlarged longitudinal section through a manifold.

Gemäß Fig. 1 und 2 werden Warmwalzbänder 1 auf einem Auslaufrollgang 2 gefördert und über einen definierten Bereich an Ober- und Unterseite mit Wasser gekühlt. Die Zuführung des Kühlwassers geschieht durch obere und untere Wasserleitungen 3, 4 die an senkrechten Stützen 5 befestigt sind.1 and 2, hot rolled strips 1 are conveyed on an outfeed roller table 2 and cooled with water over a defined area on the top and bottom. The cooling water is supplied through upper and lower water pipes 3, 4 which are attached to vertical supports 5.

Jede obere Wasserleitung 3 ist an ein quer über dem Rollgang 2 angeordneten, seitlich durch Deckel 6 verschlossenes Verteilerrohr 7 in dessen Mitte angeschlossen. Das Verteilerrohr 7 ist an der Oberseite mit mehreren Leitrohren 8 versehen, die in einem Bogen nach unten verlaufen. Das Verteilerrohr 10 ist an seiner Oberseite mit geraden, gegen die Bandunterseite gerichteten Leitrohren 11 versehen.Each upper water pipe 3 is connected to a distributor pipe 7 arranged transversely above the roller table 2 and laterally closed by cover 6 in the middle thereof. The distributor pipe 7 is provided on the upper side with a plurality of guide pipes 8, which run downwards in an arc. The distributor pipe 10 is provided on its upper side with straight guide pipes 11 directed towards the underside of the band.

Jede untere Wasserleitung 4 ist an einem unterhalb des Rollgangs 2 angeordneten, seitlich durch Deckel 9 verschlossenes Verteilerrohr 10 in dessen Mitte angeschlossen.Each lower water pipe 4 is connected to a distributor pipe 10 arranged below the roller table 2 and laterally closed by cover 9 in the middle thereof.

Eine erfindungsgemäße Ausbildung der Verteilerrohre 7, 10 wird nun beispielsweise anhand Fig. 3 der Zeichnung erläutert. Das durch einen Stutzen 12 einströmende Kühlwasser füllt das Verteilerrohr 7 bzw. 10, steigt gleichmäßig durch an dessen Oberseite befindliche Bohrungen 13 in die Leitrohre 8 bzw. 11 und fließt auf das Walzband 1.An inventive design of the distributor pipes 7, 10 will now be explained, for example, with reference to FIG. 3 of the drawing. The cooling water flowing in through a nozzle 12 fills the distributor pipe 7 or 10, rises evenly through bores 13 on the upper side thereof into the guide pipes 8 or 11 and flows onto the rolled strip 1.

Zur Einstellung der Kühlwasserbeaufschlagung auf unterschiedliche Bandbreiten sind je ein in dem Verteilerröhr 7 bzw. 10 dichtend geführter Kolben 15, 16 auf einem Rechts- bzw. Linksgewinde einer in den Deckeln 6 bzw. 9 gelagerten hand-oder motorgetriebenen Spindel 14 geführt. Parallel zur Spindel 14 verläuft eine in den Deckeln 6 bzw. 9 befestigte Stange 17 durch das Verteilerrohr 7 bzw. 10, die die Kolben 15, 16 als Verdrehsicherung durchdringt.In order to adjust the cooling water supply to different bandwidths, pistons 15, 16, each sealingly guided in the distributor tube 7 or 10, are guided on a right-hand or left-hand thread of a hand or motor-driven spindle 14 mounted in the covers 6 or 9. Parallel to the spindle 14, a rod 17 fastened in the covers 6 and 9 runs through the distributor pipe 7 and 10, which penetrates the pistons 15, 16 as a means of preventing rotation.

An beiden Enden der Verteilerrohre 7, 10 befinden sich unten öffnungen 18, durch die an der Kolbenaußenseite vorhandenes Leckwasser abfließen kann.At both ends of the distributor pipes 7, 10 there are openings 18 through which leak water present on the outside of the piston can flow out.

Durch Drehung der Spindel 14 werden die Kolben 15, 16 gegenläufig bewegt, wodurch die Breite der im Verteilerrohr 7 bzw. 10 zwischen den Kolben 15, 16 befindlichen Wassersäule verändert wird. Auf diese Weise können die in den Verteilerrohren 7 bzw. 10 befindlichen Bohrungen 13 zur Anpassung an schmalere Bänder nacheinander von der Wasserzufuhr abgetrennt werden.Rotation of the spindle 14 moves the pistons 15, 16 in opposite directions, as a result of which the width of the water column located in the distributor pipe 7 or 10 between the pistons 15, 16 is changed. In this way, the bores 13 located in the distributor pipes 7 and 10 can be separated from the water supply one after the other in order to adapt to narrower bands.

Die Erfindung ist nicht auf das dargestellte Ausführungsbeispiel beschränkt.The invention is not restricted to the exemplary embodiment shown.

Claims (3)

1. Vorrichtung zum Kühlen von flachem Walzgut insbesondere Walzband mittels laminarer Kühlwasserstrahlen, wobei quer über oder unter dem Walzgutdurchlauf Verteilerrohre angeordnet sind an die über die maximale Walzgutbreite mehrere auf die Oberflächen gerichtete Leitrohre angeschlossen sind,
dadurch gekennzeichnet,
daß die Verteilerrohre (7, 10) etwa in der Mitte ihres Mantels mit einem Wasseranschluß (3, 4) versehen sind und beidseits innerhalb des Rohrmantels dichtend geführte Kolben (15, 16) gegenläufig verstellbar sind.1. Device for cooling flat rolling stock, in particular rolled strip, by means of laminar cooling water jets, distribution pipes being arranged transversely above or below the rolling stock pass, to which a plurality of guide tubes directed towards the surfaces are connected over the maximum rolling stock width,
characterized,
that the distributor pipes (7, 10) are provided with a water connection (3, 4) approximately in the middle of their jacket and pistons (15, 16) sealingly guided on both sides within the pipe jacket are adjustable in opposite directions. 2. Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß die Kolben (15, 16) durch eine in äußeren Verteilerrohrdeckeln (6, 9) zentral geführte Spindel (14) mit Rechts- und Linksgewinde verstellbar sind.2. Device according to claim 1,
characterized,
that the pistons (15, 16) are adjustable by means of a spindle (14) with a right-hand and left-hand thread which is guided centrally in the outer distributor pipe covers (6, 9). 3. Vorrichtung nach den Ansprüchen 1 und 2,
dadurch gekennzeichnet,
daß die Kolben (15, 16) mittels Bohrungen auf in den Verteilerrohrdeckeln (6, 9) befestigten, parallel zu der Spindel (14) verlaufenden Führungsstangen (17) geführt sind.3. Device according to claims 1 and 2,
characterized,
that the pistons (15, 16) are guided by means of bores on guide rods (17) which are fastened in the distributor tube covers (6, 9) and run parallel to the spindle (14).
EP82110137A 1981-11-25 1982-11-04 Device for cooling flat rolled products Withdrawn EP0080086A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3146657 1981-11-25
DE19813146657 DE3146657A1 (en) 1981-11-25 1981-11-25 DEVICE FOR COOLING FLAT ROLLING MATERIAL

Publications (1)

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EP0080086A1 true EP0080086A1 (en) 1983-06-01

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EP82110137A Withdrawn EP0080086A1 (en) 1981-11-25 1982-11-04 Device for cooling flat rolled products

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0449003A2 (en) * 1990-03-28 1991-10-02 Sms Schloemann-Siemag Aktiengesellschaft Apparatus for cooling rolled strip
EP1112785A2 (en) * 1999-12-28 2001-07-04 Firma Wepuko Hydraulik GmbH & Co. Pumpen- und Kompressorenfabrik Device for hydraulically descaling workpieces
WO2010105577A1 (en) * 2009-03-20 2010-09-23 宝山钢铁股份有限公司 Plunger type laminar flow cooling device
WO2010105580A1 (en) * 2009-03-20 2010-09-23 宝山钢铁股份有限公司 Plunger type laminar flow cooling device
CN102189128A (en) * 2010-03-19 2011-09-21 宝山钢铁股份有限公司 Up-spray laminar flow cooling device
CN102189131A (en) * 2010-03-19 2011-09-21 宝山钢铁股份有限公司 Lower spraying laminar flow cooling device
CN102189130A (en) * 2010-03-19 2011-09-21 宝山钢铁股份有限公司 A self-balancing plunger-type upper spraying laminar flow cooling device
DE102011007803A1 (en) 2011-03-18 2012-09-20 Sms Siemag Ag Device used for supplying medium e.g. water on region for cooling rolled stock in rolling mill, has switching unit that is divided into two main portions for switching between fluid disconnection and fluid connection of main portions

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU3488293A (en) * 1992-02-24 1993-09-13 Alcan International Limited Process and apparatus for applying and removing liquid coolant to control temperature of continuously moving metal strip
DE19934557C2 (en) * 1999-07-22 2002-10-24 Thyssenkrupp Stahl Ag Device for cooling metal strips or sheets conveyed on a conveyor line
CN102189133B (en) * 2010-03-19 2013-03-13 宝山钢铁股份有限公司 Lower spraying and cooling device arranged between finishing mill frames

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1397068A (en) * 1963-06-04 1965-04-23 United Eng Foundry Co Method and apparatus for cooling a web
FR2379779A1 (en) * 1977-02-07 1978-09-01 Davy Loewy Ltd COOLANT TRANSMITTER
JPS5619923A (en) * 1979-07-27 1981-02-25 Sumitomo Metal Ind Ltd Cleaning apparatus for cold rolled steel sheet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1397068A (en) * 1963-06-04 1965-04-23 United Eng Foundry Co Method and apparatus for cooling a web
FR2379779A1 (en) * 1977-02-07 1978-09-01 Davy Loewy Ltd COOLANT TRANSMITTER
JPS5619923A (en) * 1979-07-27 1981-02-25 Sumitomo Metal Ind Ltd Cleaning apparatus for cold rolled steel sheet

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0449003A2 (en) * 1990-03-28 1991-10-02 Sms Schloemann-Siemag Aktiengesellschaft Apparatus for cooling rolled strip
EP0449003A3 (en) * 1990-03-28 1992-03-18 Sms Schloemann-Siemag Aktiengesellschaft Apparatus for cooling rolled strip
EP1112785A2 (en) * 1999-12-28 2001-07-04 Firma Wepuko Hydraulik GmbH & Co. Pumpen- und Kompressorenfabrik Device for hydraulically descaling workpieces
EP1112785A3 (en) * 1999-12-28 2002-01-30 Firma Wepuko Hydraulik GmbH & Co. Pumpen- und Kompressorenfabrik Device for hydraulically descaling workpieces
CN101837376B (en) * 2009-03-20 2011-09-21 宝山钢铁股份有限公司 Plunger-type upper spraying laminar flow cooling device
CN101837379B (en) * 2009-03-20 2013-04-24 宝山钢铁股份有限公司 Laminar flow width-offset-adjusting cooling device and control method thereof
KR101327766B1 (en) * 2009-03-20 2013-11-20 바오샨 아이론 앤 스틸 유한공사 Plunger type laminar flow cooling device
KR101319389B1 (en) * 2009-03-20 2013-10-17 바오샨 아이론 앤 스틸 유한공사 Plunger type laminar flow cooling device
WO2010105577A1 (en) * 2009-03-20 2010-09-23 宝山钢铁股份有限公司 Plunger type laminar flow cooling device
RU2491142C2 (en) * 2009-03-20 2013-08-27 Баошан Айрон Энд Стил Ко., Лтд. Piston-type device for laminar cooling
RU2491143C2 (en) * 2009-03-20 2013-08-27 Баошан Айрон Энд Стил Ко., Лтд. Plunger-type device for laminar cooling
WO2010105580A1 (en) * 2009-03-20 2010-09-23 宝山钢铁股份有限公司 Plunger type laminar flow cooling device
CN102189130B (en) * 2010-03-19 2013-04-24 宝山钢铁股份有限公司 A self-balancing plunger-type upper spraying laminar flow cooling device
CN102189128B (en) * 2010-03-19 2013-04-24 宝山钢铁股份有限公司 Up-spray laminar flow cooling device
CN102189131B (en) * 2010-03-19 2013-07-17 宝山钢铁股份有限公司 Lower spraying laminar flow cooling device
CN102189130A (en) * 2010-03-19 2011-09-21 宝山钢铁股份有限公司 A self-balancing plunger-type upper spraying laminar flow cooling device
CN102189131A (en) * 2010-03-19 2011-09-21 宝山钢铁股份有限公司 Lower spraying laminar flow cooling device
CN102189128A (en) * 2010-03-19 2011-09-21 宝山钢铁股份有限公司 Up-spray laminar flow cooling device
DE102011007803A1 (en) 2011-03-18 2012-09-20 Sms Siemag Ag Device used for supplying medium e.g. water on region for cooling rolled stock in rolling mill, has switching unit that is divided into two main portions for switching between fluid disconnection and fluid connection of main portions

Also Published As

Publication number Publication date
DE3146657A1 (en) 1983-06-01

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