EP0203980A1 - Dispositif pour transmettre aux systemes individuels d'arrosage des machines de coulee sous pression un liquide compose d'eau et d'additifs. - Google Patents

Dispositif pour transmettre aux systemes individuels d'arrosage des machines de coulee sous pression un liquide compose d'eau et d'additifs.

Info

Publication number
EP0203980A1
EP0203980A1 EP86900103A EP86900103A EP0203980A1 EP 0203980 A1 EP0203980 A1 EP 0203980A1 EP 86900103 A EP86900103 A EP 86900103A EP 86900103 A EP86900103 A EP 86900103A EP 0203980 A1 EP0203980 A1 EP 0203980A1
Authority
EP
European Patent Office
Prior art keywords
die casting
liquid
additives
water
casting machines
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
EP86900103A
Other languages
German (de)
English (en)
Other versions
EP0203980B1 (fr
Inventor
Helmut Thurner
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.)
Bayerisches Druckgusswerk Thurner KG
Original Assignee
Bayerisches Druckgusswerk Thurner KG
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 Bayerisches Druckgusswerk Thurner KG filed Critical Bayerisches Druckgusswerk Thurner KG
Priority to AT86900103T priority Critical patent/ATE43267T1/de
Publication of EP0203980A1 publication Critical patent/EP0203980A1/fr
Application granted granted Critical
Publication of EP0203980B1 publication Critical patent/EP0203980B1/fr
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2007—Methods or apparatus for cleaning or lubricating moulds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/85978—With pump
    • Y10T137/86131—Plural

Definitions

  • the invention relates to a device for supplying sprayers for die casting machines, each with a liquid containing water and additives for cooling, cleaning and / or lubricating purposes.
  • the opened mold is wetted on the inside with a liquid before the casting, which contains water and additives, dissolved, suspended or emulsified therein.
  • the liquid is used for separation, cooling and / or lubrication.
  • the composition of the liquid depends on the material and shape of the castings, in particular on their wall thickness, and on the conditions for quick and easy demolding.
  • the liquid is supplied to the walls of the mold with spray devices. It is known to connect a spray device arranged on a die casting machine to a container from which the liquid is conveyed by means of compressed air to the nozzles of the spray device (practice of die casting production by E. Brunhuber, 1980, ausverlag Schiele & Schön GmbH, page 128.)
  • liquids with different compositions and different spraying devices adapted to the respective casting mold are often required. If the liquid supply in the container is not exhausted when the mold is changed, the container must be emptied and filled with a mixture which is matched to the other mold. In addition, the capacity of the container for a larger series of the same mold may not is sufficient. The die casting process must then be stopped in automatic mode when the liquid supply in the container is exhausted.
  • the object of the invention is to develop a device suitable for automatic operation for supplying one or more spraying devices for die casting machines, each with a liquid containing water and additives, for cooling, cleaning and / or lubricating purposes.
  • the object is achieved by the measures described in claim 1.
  • the device specified in claim 1 it is possible to set the desired mixing ratio with the mixing valve on the respective die casting machine. Then only the amount of liquid specially tailored to the respective casting mold is required for the individual spraying operation.
  • the setting can be made in a short time. The production process is therefore no longer affected by time-consuming refilling or decanting of the liquid for the spraying operation.
  • the die casting machines can be better utilized with the device described in claim 1, since there are fewer set-up times.
  • the principle of the invention is to store liquids with the highest necessary concentration and to carry out the required dilution with water for each casting process before spraying.
  • a number of central containers is provided corresponding to the type of the casting materials to be processed in the die casting machines, in which in each case liquids from water and Additives are stored in the highest concentration required for the respective casting material with a corresponding shape, the central containers being connected via switching valves to a pipeline system to which the mixing valves are closed.
  • the central containers are preferably arranged higher than the die casting machines.
  • the liquids get from the containers to the mixing valves under the influence of gravity. There is therefore no need for expensive and energy-consuming subsidies.
  • the pump is designed as a piston pump, the cylinder of which is either vertical or can assume any other position if it is ensured that gravity does the necessary work via the media.
  • the piston of the respective piston pump preferably has two disks which are arranged at a distance from one another, one of which faces the cylinder space intended for holding the liquid and the other faces the cylinder space which can be acted upon by a compressed gas and which delimits the two disks Interspace can be connected via a check valve when the excess pressure is removed.
  • liquid which penetrates into the intermediate space during the pumping out of the cylinder space filled with liquid can, after the pumping process has ended, enter the cylinder space which is no longer under gas pressure and escape therefrom.
  • the cylinder space to which compressed gas can be applied is expediently connectable to the compressed air source provided for the spraying device via a changeover valve.
  • the same source of compressed air can therefore be used to actuate the pump and the sprayer.
  • a check valve is arranged at the outlet of the cylinder chamber to which liquid can be applied.
  • the pump can be installed at a suitable location below the sprayer.
  • the check valve prevents liquid from flowing back from the spray device to the pump or that the spray device releases drops.
  • a preferred embodiment of a mixing valve is that a cylindrical body rotatably arranged in a housing has a central cavity that is open on one side and a radial slot that can be rotated relative to two inlet openings in a housing wall for the liquid and for water, while changing the inlet cross-sections in opposite directions is, with check valves upstream of the inlet openings.
  • the check valves prevent the liquid contained in the cylinder from flowing back when the cylinder is pumped out into the central container.
  • the cylindrical body can be provided with a lever, one end of which is designed as a display tip for a scale. This embodiment enables the mixing ratio to be set by hand.
  • the cylindrical body with a motor drive and to detect the angular position of the cylindrical body via a position indicator.
  • a potentiometer which gives an analog display, or a Godi erschei be, with which the position can be recorded digitally, is suitable as a position reporting device.
  • -A gear motor can be used as the motor drive.
  • the cylinder of the pumps is preferably composed of two disks and a cylindrical jacket arranged between the disks. This embodiment can be produced economically. It is sufficient if the cylindrical jacket is relatively thin-walled. Stops can be provided in the cylinder to limit the stroke of the piston. The suction volume of the cylinder and thus the amount of liquid to be sprayed can be specified by adjusting the stops.
  • FIG. 2 is a perspective view of a mixing valve and a pump of the device shown in FIG. 1,
  • FIG. 3 shows a longitudinal section through the device shown in FIG. 2, FIG.
  • Fig. 4 is a cross section along the lines III-III of the device shown in Fig. 3.
  • Die casting machines 10,12 of which are shown in Fig. 1> two, each have sprayers 14,16 with which the surfaces are sprayed molds 18,20, each consisting of a fixed and a displaceable cash mold half.
  • the two halves of the molds 18, 20 are not identified in any more detail.
  • the two die casting machines 10, 12 each have a machine bed and stands arranged thereon.
  • the fixed mold halves and hydraulic elements are attached to the stands.
  • a slide and the movable mold half attached to it are moved with the hydraulic elements during the production of the die castings.
  • the machine bed, the stand and the hydraulic elements are designated in more detail in FIG. 1.
  • the spray devices 14, 16 With the spray devices 14, 16, a liquid is sprayed onto the mold surfaces for cooling, cleaning and / or lubricating purposes.
  • the spray devices 14, 16, which are provided with directionally adjustable spray nozzles, are not horizontally and vertically displaceable and pivotable on supports 22, 24 attached.
  • the carriers 22, 24 are each arranged on one of the machine stands.
  • the liquids to be sprayed consist of water with additives, which can be graphite, pigments or the like in conjunction with special active substances and carriers. Emulsifiable, pigment-free additives are also often used.
  • Liquids with different compositions are often required for different shapes 18, 20 and different casting materials.
  • the sprayers 14, 16 also often have to be replaced or readjusted to adapt to a different mold.
  • a device which has at least one central container 26 for the spraying devices 14, 16.
  • the container 26 contains water with the additives in the highest required concentration. The concentration is set to the mold and the casting material that require the highest proportion of additives for the production of perfect castings.
  • the additives can e.g. be diluted 1:50 or 1:80 with water. If for different casting materials, e.g. Aluminum or die-cast zinc, different additives are required, further central containers with liquids are to be provided, in which the corresponding additives are dissolved in the highest necessary concentration. In Fig. 1 only a further central container 28 is shown. If necessary, several central containers can be provided.
  • the central containers 26, 28 are connected on the outlet side via pipes 30, 32 to a changeover valve 34. the one whose output is connected to a central pipeline system 36 which contains branches (not designated in more detail) which run to the die casting machines 10, 12 and further die casting machines (not shown).
  • Mixing valves 38, 40 are located on the die casting machines 10, 12 and the other die casting machines, each of which is connected to the piping system 36 with an inlet.
  • the mixing valves 38, 40 are each connected to a pipeline system 42, which is fed by a central container 44, in which water is located, with a second inlet.
  • the central containers 26, 28, 44 are located at the same height above the die casting machines 10, 12.
  • the water from the container 44 and the valve through the changeover '34 are each selected liquid come under the influence of gravity and at substantially equal pressure to the mixing valves 38,40 to the die casting machines 10,12.
  • the concentration of the required for the respective manufacturing process In the adjustable mixing valves 38, 40, the concentration of the required for the respective manufacturing process. Additives generated in the water by adding water from the container 44.
  • the mixing valves 38, 40 are each followed by pumps 46, 48, which are arranged, for example, at the level of the machine bed of the respective die casting machine 10, 12. On the output side, the pumps 46, 48 are each connected to the sprayers 14, 16 via pipes 50, 52.
  • the pipelines 30, 32, the changeover valve 34, the piping system 36, the mixing valves 38, 40, the piping system 42, the container 44 and the pumps 46, 48, as well as the containers 26, 28, belong to the device with which the die casting machines 10 , 12 centrally and automatically each with a water and additives in a liquid containing adjustable on the mixing valves 38.40 containing concentration.
  • the container 44 is provided with a device 54 for regulating the water level in the container 44. If the water level drops below a certain level, this is determined by a fill level sensor which belongs to the device 54. The fill level sensor opens a tap in a feed line for the container 44 fed by the water supply system until the desired fill level is reached.
  • Filling 1 level sensors 56 which control dosing devices 58, are also arranged in the containers 26 and 28.
  • the metering devices 58 generate the liquids intended for the containers 26, 28 from the additives and the water fed in.
  • the pumps 46, 48 each have a cylindrical one. Jacket 60, which is clamped between an upper disk 62 and a lower disk 64 using seals that are not described in more detail.
  • the disks 62, 64 are rectangular.
  • the washers 62, 64 are connected to one another at the four corners by means of stud bolts 66.
  • the pumps 46, 48 stand with their cylinders on the die casting machines 12, 10.
  • the mixing valve 38 or 40 is attached to the upper disk 62.
  • the mixing valves 38, 40 are each provided with a connection piece 68 for the liquid supplied by the containers 26 or 28 and with a connection piece 70 for the water supplied by the container 44.
  • a bearing 74 in which a cylindrical body 76 is rotatably arranged, is fastened in a cylindrical housing 72 or mixing valves 38, 40.
  • the cylindrical body 76 consists of two sections 78, 80 with different diameters.
  • the section 78 with the larger diameter has a cylindrical recess 82, the side of the mixing valve 38 or 40 facing the pump 46, 48 is open.
  • slot 84 which extends over the entire half of the circular ring of the wall surrounding the recess 82.
  • the slot 84 there are cylindrical recesses 86, 88 for diametrically opposite locations of the housing 72 and the bearing 74 the liquid and water inlet.
  • the recesses 86, 88 are each connected to the cavities of the connecting pieces 68, 70, which are unspecified, and which are screwed into the housing 72.
  • the mixing ratio between the liquid arriving via the connecting piece 68 and the water arriving via the connecting piece 70 can be changed.
  • the end faces of the connecting pieces 68, 70 which are located in the interior of the housing 72 and are not designated in any more detail, are each designed as valve seats for valve disks 90, 92, which are pressed against the valve seats under spring preload.
  • the housing 72 is closed on its side facing away from the pump 46 or 48 with a plate-shaped cover 96, which has an opening (not designated in any more detail) through which the section 80 of the body 76 protrudes outwards.
  • a lever 98 is inserted into an approximately radial bore in section 80 and then screwed on. The lever 98 protrudes from the section 80 on both sides.
  • the angular position of the slot 84 can be adjusted by hand using the lever 98 in accordance with a desired mixing ratio.
  • the shaft of a motor 106 e.g. of a geared motor to which section 80 is connected.
  • the motor 106 is shown in dash-dot lines in FIG. 2 above the end face of the section 80.
  • the slot 84 can be adjusted to the desired angular position by remote control.
  • a rotary position transmitter e.g. a potentiometer, not shown, can be used, which emits an angular position-dependent voltage at the tap, which voltage is detected at a central control point.
  • the mixing ratio can be automatically set to, for example, predetermined values by a programmable control device.
  • the housing 72 of the mixing valve 38 or 40 is fastened on the disk 62 of the pump 46 or 48 in such a way that the cutout 82 is aligned with an inlet 108 in the disk 62.
  • the inlet 108 opens into a cylinder space 110 within the cylinder 112 formed by the disks 62, 64 and the casing 60, in which a piston 114 is connected. is slidably arranged.
  • the piston 114 contains two spaced apart piston plates 116, 118, which are connected to one another via a central pin 120.
  • the cylinder space has an outlet opening 132 which is arranged in the disk 62 and into which a connecting piece 134 is screwed.
  • the outlet opening 132 has at its end facing the cylinder space 110 an annular projection 136 against which a cover 138 is pressed in a sealing manner under spring tension.
  • a spring 140 is supported on a shoulder in the connecting piece 134 and on the cover 138.
  • the lid 138 forms a check valve with the projection 136 and the spring 140.
  • the liquid provided with the additives in the highest required concentration passes from the containers 26 and 28 via the lines 30, 32 to the changeover valve 34, through which the container 26 or 28 is selected.
  • the setting of the changeover valve 34 defines the connection of the container 26 or 28 to the piping system 36, which is expediently provided with an outlet tap with which the liquid still present in the line system can be removed before switching to another container.
  • the liquid reaches the connection stub 68 of the mixing valves 38, 40 via the pipeline system 36.
  • Water enters the container 44 via the pipe system 42 into the connecting piece 70 of the mixing valves 38, 40. Under the force of gravity of the liquid or the water, the valve plates 90, 92 are opened, so that the liquid and the water each reach the body 76 via the recesses 86 and 88.
  • the liquid and the water mix in the slot 84 and in the recess 82.
  • the mixture passes through the inlet 108 into the cylinder space 110, which fills with the liquid mixture, the mixing ratio of which depends on the position of the slot 84.
  • the angular positions of the slots 84 in the mixing valves 38, 40 differ.
  • Switchover valves 142, 144 are located between the compressed air source 126 and the bores 124, which can be actuated by hand or by a control.
  • the cylinder space 122 In the rest position of the piston 114, the cylinder space 122 is placed at atmospheric pressure via the changeover valves 142, 144.
  • the piston 114 bears against stops 146 designed as screws, which are screwed into the disk 64 and limit the stroke of the piston 114.
  • the maximum available volume of the cylinder space 110 for the liquid mixture and thus the amount of liquid intended for spraying is determined via the stroke path with the stops 146.
  • liquid which has entered the intermediate space 130 between the piston disk 116 and the jacket 60 can enter the cylinder space 122 via the check valve 128 and escape from there into the atmosphere.
  • the cylinder spaces 122 are each over the Switch valves 142, 144 connected to the compressed air source 126.
  • the sprayers 14, 16 are supplied with compressed air from the compressed air source 126.
  • the piston 114 is moved upward when pressurized with compressed air, a working pressure of 7 bar being generated in the cylinder chamber 110, for example.
  • the check valves in the mixing valves 38, 40 close under the pressure prevailing in the working space, so that no liquid is pumped back from the cylinder space 110 into the containers 26, 28, 44.
  • the liquid leaves the cylinder space 110 through the outlet opening 132 and enters the pipes 50 and 52, which run to the sprayers 14, 16.
  • the cylinder space 122 is in each case applied to atmospheric air pressure by the changeover valves 142, 144, which can be electromagnetically actuated control valves.
  • the check valve consisting of the elements 136, 138, 140 closes, which prevents a return flow of liquid from the sprayers 14, 16 and the pipes 50, 52.
  • This check valve is set so that it closes when the pressure in the cylinder chamber 10 drops to 2 bar.
  • dripping on the spraying devices 14, 16 is advantageously prevented, so that there can be no undesired influencing of the surface of the open mold 18, 20 by drops.
  • the pumps 46, 48 are arranged lower than the sprayers 14, 16.
  • the piston 114 which can be rotated in one piece, has a certain axial extent, so that a low pressure is sufficient to actuate the piston 114. If liquid gets into the gap 130, it becomes eliminated via the check valve 128. This ensures a smooth, trouble-free operation of the piston 114. Since the cylinder 112 is operated at low pressure, the jacket 60 can be made thin-walled.
  • the level control makes it possible to design the central containers 26, 28, 44 with a small volume. Instead of the container 44 with level control, a feed from the water supply network can also be undertaken, with a pressure reducing valve being used to adapt the pressure to the pressure at the mixing valves 38, 40 depending on the height of the containers 26, 28.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Accessories For Mixers (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
  • Casting Devices For Molds (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Detergent Compositions (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

Un dispositif pour transmettre aux systèmes individuels d'arrosages des machines de coulée sous pression un liquide composé d'eau et d'additifs, servant au refroidissement, au nettoyage et/ou à la lubrification. Le dispositif comporte au moins un récipient central (26, 28) dans lequel est stockée l'eau avec les additifs, dont la concentration est fixée à une valeur maximale. Cette valeur dépend des matières à couler, des moules (18, 20) et du procédé de coulée sous pression utilisés sur la machine de coulée, (10, 12). Dans un autre récipient central (44) est stockée l'eau. Chacun de ces récipients (26, 28, 44) est connecté, sur une machine de coulée (10, 12) à une vanne de mélange (38, 40), à laquelle sont reliés des systèmes de transmission qui communiquent avec l'unité d'arrosage (14, 16) de chaque machine de coulée sous pression (10, 12).
EP86900103A 1984-12-04 1985-12-04 Dispositif pour transmettre aux systemes individuels d'arrosage des machines de coulee sous pression un liquide compose d'eau et d'additifs Expired EP0203980B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86900103T ATE43267T1 (de) 1984-12-04 1985-12-04 Vorrichtung zur versorgung von spruehgeraeten fuer druckgiessmaschinen je mit einer wasser und zusaetze enthaltenden fluessigkeit.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3444182 1984-12-04
DE19843444182 DE3444182A1 (de) 1984-12-04 1984-12-04 Vorrichtung zur versorgung von spruehgeraeten fuer druckgiessmaschinen je mit einer wasser und zusaetze enthaltenden fluessigkeit

Publications (2)

Publication Number Publication Date
EP0203980A1 true EP0203980A1 (fr) 1986-12-10
EP0203980B1 EP0203980B1 (fr) 1989-05-24

Family

ID=6251865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86900103A Expired EP0203980B1 (fr) 1984-12-04 1985-12-04 Dispositif pour transmettre aux systemes individuels d'arrosage des machines de coulee sous pression un liquide compose d'eau et d'additifs

Country Status (8)

Country Link
US (1) US4721150A (fr)
EP (1) EP0203980B1 (fr)
JP (1) JP2608057B2 (fr)
KR (1) KR870700031A (fr)
AT (1) ATE43267T1 (fr)
AU (1) AU5230386A (fr)
DE (2) DE3444182A1 (fr)
WO (1) WO1986003438A1 (fr)

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US5435390A (en) * 1993-05-27 1995-07-25 Baker Hughes Incorporated Remote control for a plug-dropping head
DE19528337C1 (de) * 1995-08-02 1996-11-28 Braas Gmbh Verfahren und Vorrichtung zur Versorgung einer Sprüheinrichtung an einer Formgußmaschine mit einem flüssigen Fertigungshilfsmittel
DE19810032A1 (de) * 1998-03-09 1999-09-16 Acheson Ind Inc Verfahren und Vorrichtung zum Vorbereiten der Formwandungen einer Form zur Urformung bzw. Umformung auf den nächstfolgenden Formungszyklus, Sprühelement mit Zentrifugalzerstäubung und Luftführung und Verwendung eines derartigen Sprühelements zum Versprühen im wesentlichen lösungsmittelfreien Formwandbehandlungsmittels
US6830200B1 (en) 2001-07-31 2004-12-14 Honda Motor Co., Ltd. Mold spraying system
US6616848B2 (en) 2001-10-11 2003-09-09 Honda Giken Kogyo Kabushiki Kaisha Die lube recovery system and method
DE102009010361B3 (de) * 2009-02-25 2010-10-28 Ks Aluminium-Technologie Gmbh Verfahren und Sprühvorrichtung zum Aufbringen eines Oberflächenbehandlungsmittels auf eine Formwand einer Gussform
JP6086895B2 (ja) * 2014-12-12 2017-03-01 ジヤトコ株式会社 金型の冷却装置
CN106042261B (zh) * 2016-07-22 2018-05-22 成都盛达强科技开发有限公司 一种列排式反应注射成型机组
IT201800006906A1 (it) * 2018-07-04 2020-01-04 Procedimento ed impianto di dosaggio di un diluito
US20210121906A1 (en) * 2019-10-25 2021-04-29 Lincoln Global, Inc. Programmable networked variable atomizer (pnva) system

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US2587722A (en) * 1950-11-29 1952-03-04 Louis D Garratt Treatment of mold surfaces
DE1296743B (de) * 1964-04-04 1969-06-04 Bayerische Manufaktur Fuer Klu Vorrichtung zur Einbringung von Trenn- oder Schmiermitteln auf die Formhaelften einer Druckgiessmaschine
DE1284250B (de) * 1965-10-30 1968-11-28 Kaercher Fa Alfred Spruehgeraet zum Verspruehen eines Fluessigkeits-Gemisches
DE2549059C2 (de) * 1975-11-03 1977-10-06 Georg Palzer KG Druckguß Seligenstadt, 6453 Seligenstadt Sprüheinrichtung fur Druckgußformen
US4186769A (en) * 1978-01-25 1980-02-05 Chem-Trend, Inc. Liquid mixing and delivering aparatus
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Also Published As

Publication number Publication date
US4721150A (en) 1988-01-26
DE3570380D1 (en) 1989-06-29
WO1986003438A1 (fr) 1986-06-19
JPS62501276A (ja) 1987-05-21
AU5230386A (en) 1986-07-01
KR870700031A (ko) 1987-02-28
ATE43267T1 (de) 1989-06-15
EP0203980B1 (fr) 1989-05-24
JP2608057B2 (ja) 1997-05-07
DE3444182C2 (fr) 1987-10-22
DE3444182A1 (de) 1986-06-12

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