EP0040316B1 - Method of profiling a metal strip, particularly of a band in double band presses - Google Patents
Method of profiling a metal strip, particularly of a band in double band presses Download PDFInfo
- Publication number
- EP0040316B1 EP0040316B1 EP81102726A EP81102726A EP0040316B1 EP 0040316 B1 EP0040316 B1 EP 0040316B1 EP 81102726 A EP81102726 A EP 81102726A EP 81102726 A EP81102726 A EP 81102726A EP 0040316 B1 EP0040316 B1 EP 0040316B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tool
- band
- press
- profiling
- graduation
- 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
Links
- 238000000034 method Methods 0.000 title claims description 15
- 239000002184 metal Substances 0.000 title claims description 7
- 238000005096 rolling process Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 2
- 230000035571 calor Effects 0.000 claims 1
- 238000004049 embossing Methods 0.000 description 6
- 238000003754 machining Methods 0.000 description 6
- 238000007493 shaping process Methods 0.000 description 4
- 238000002679 ablation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000009760 electrical discharge machining Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000010358 mechanical oscillation Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/02—Advancing work in relation to the stroke of the die or tool
- B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
- B21D43/06—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by positive or negative engaging parts co-operating with corresponding parts of the sheet or the like to be processed, e.g. carrier bolts or grooved section in the carriers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H8/00—Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects, e.g. checkered sheets
Definitions
- the invention relates to a method for profiling metal strips, in particular press strips in double belt presses.
- the profiling of workpiece surfaces can be done by embossing or by removing or removing material from the workpiece for the purpose of shaping; the latter is generally known as so-called machining or machining. This includes, for example, chiseling, planing, shaping, sawing, turning, milling, grinding, drilling, etc.
- Electrothermal ablation takes place in a stationary discharge process in the arc, the ablation process being purely thermal in nature.
- the erosion takes place by spark erosion, in which the discharge processes are not stationary, but are controlled by special energy sources that supply the spark gap with impulsive energy surges.
- the electrodes can support additional mechanical oscillation and rotation movements to support the removal effect.
- the removal by electrochemical means or also called electrochemical lowering takes place in that the cathodically poled machining tool or the tool electrode is lowered into the anodically poled workpiece or the workpiece electrode at a constant feed rate.
- electrochemical means also called electrochemical lowering takes place in that the cathodically poled machining tool or the tool electrode is lowered into the anodically poled workpiece or the workpiece electrode at a constant feed rate.
- a work gap is formed between the workpiece and the tool, through which the electrolyte solution flows at high speed, thereby removing the removal products and the heat generated by the current flow.
- shaping can also be carried out using embossing rollers or molettes. Mettling takes place by molding the profiled surface of a press roll under pressure on the surface to be profiled.
- the state of the art is, for example, DE-C-1 298 854, 1 440 999, 1 565 468 and 1 961 676, GB-A-856 340, FR-A-1 224109 and US-A -3 042 789 and 3 363 082.
- the circumference of the tool (or the electrode in the electrothermal and electrochemical processes) and the circumference of the roll to be profiled are dimensioned such that the repeat length on the circumference of the roll to be profiled can usually be accommodated several times as an integer.
- the inventor has the task of transferring this state of the art, which is known in the case of pressure and embossing rollers, to the profiling of metal strips, in particular of press strips for double-band presses, the length of which, in contrast to the ratios in the case of rollers, is a multiple of conventional roller circumferences, and only with great effort can be determined. To make matters worse, this length must be maintained for the time of processing or its change must be measured or influenced continuously.
- a division is provided which is in engagement with a corresponding division of the profiling tool, the flushing of the press belt edge being an integral multiple of that Division of the tool circumference or of the repeat lying on the tool circumference corresponds, if this is not identical to the tool circumference, so that the beginning of the press belt structure and its end merge into one another without visible transitions, and the division is evaluated by electronic or mechanical means, a synchronization of Tool and workpiece passing through when mapping the surface profile Electrothermal, electrochemical or forming processing allowed.
- a forced synchronization between the jacket of the synchronously driven deflection drum and the press belt can be accomplished, for example, with the help of toothing, as described in DE-A-2 737 629.
- a toothing is arranged on the side edges of the steel strips, which engages in a corresponding end toothing of a hollow gear on the deflection drum.
- the press belt is tensioned over two deflection drums and driven via the edge teeth of the press belt.
- the tool or the tool electrode is brought into engagement at a suitable point on the press belt tensioned on the deflection drums and driven in the direction of rolling. If the two drives are synchronized mechanically via known differential gears or electronically via position control controls that are also known, the surface profiling of press belts for double-belt presses can be carried out without any problems, whereby a surface mapping between tool and workpiece that goes down to the finest details is achieved.
- the drawing shows schematically the molding process according to the method of the invention.
- the press belt 2 to be profiled which is driven in the direction of arrow 6, is stretched over the drum 1.
- the reference numeral 3 designates the tool or the tool electrode, the surface 4 of which is molded onto the press belt 2.
- the impression is taken in the synchronization area 5 of the press belt 2 and tool 3.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Press Drives And Press Lines (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Description
Die Erfindung bezieht sich auf ein Verfahren zum Profilieren von Metallbändern, insbesondere von Preßbändern in Doppelbandpressen.The invention relates to a method for profiling metal strips, in particular press strips in double belt presses.
Das Profilieren von Werkstückoberflächen, in diesem Fall von Preßbandoberflächen, kann durch Prägen oder durch Entfernen oder Abtragen von Werkstoff am Werkstück zum Zwecke der Formgebung erfolgen; letzteres ist als sogenannte spanende oder spanabhebende Bearbeitung allgemein bekannt. Hierzu gehören beispielsweise das Meißeln, Hobeln, Stoßen, Sägen, Drehen, Fräsen, Schleifen, Bohren usw.The profiling of workpiece surfaces, in this case press belt surfaces, can be done by embossing or by removing or removing material from the workpiece for the purpose of shaping; the latter is generally known as so-called machining or machining. This includes, for example, chiseling, planing, shaping, sawing, turning, milling, grinding, drilling, etc.
Es ist weiter bekannt, das Abtragen von Material auf elektrothermischem, funkenerosivem oder elektrochemischem Wege vorzunehmen. Das elektrothermische Abtragen erfolgt in einem stationären Entladungsvorgang im Lichtbogen, wobei der Abtragevorgang rein thermischer Natur ist. Beim elektroerosiven Verfahren erfolgt das Abtragen durch Funkenerosion, bei der die Entladungsvorgänge nicht stationär sind, sondern durch besondere Energiequellen gesteuert werden, die die Funkenstrecke mit impulsartigen Energiestößen versorgen. Dabei können die Elektroden zur Unterstützung der Abtragewirkung zusätzliche mechanische Schwing- und Rotationsbewegungen ausführen. Durch Einbringen einer dielektrischen Arbeitsflüssigkeit zwischen die Elektroden kann ihre Entfernung voneinander wesentlich verringert werden, wodurch die Abtragewirkung der Entladung ganz erheblich vergrößert werden kann. Das Abtragen auf elektrochemischem Wege oder auch elektrochemisches Senken genannt, geschieht dadurch, daß man das kathodisch gepolte Bearbeitungswerkzeug oder die Werkzeugelektrode mit konstanter Vorschubgeschwindigkeit in das anodisch gepolte Werkstück oder die Werkstückelektrode einsenkt. Zwischen Werkstück und Werkzeug bildet sich prozeßbedingt ein Arbeitsspalt aus, durch den die Elektrolytlösung mit hoher Geschwindigkeit strömt und dabei die im Arbeitsspalt entstehenden Abtragprodukte und die durch den Stromfluß entstehende Wärme abführt.It is also known to carry out the removal of material by electrothermal, spark erosive or electrochemical means. Electrothermal ablation takes place in a stationary discharge process in the arc, the ablation process being purely thermal in nature. In the electroerosive process, the erosion takes place by spark erosion, in which the discharge processes are not stationary, but are controlled by special energy sources that supply the spark gap with impulsive energy surges. The electrodes can support additional mechanical oscillation and rotation movements to support the removal effect. By introducing a dielectric working fluid between the electrodes, their distance from one another can be significantly reduced, as a result of which the removal effect of the discharge can be increased considerably. The removal by electrochemical means or also called electrochemical lowering takes place in that the cathodically poled machining tool or the tool electrode is lowered into the anodically poled workpiece or the workpiece electrode at a constant feed rate. Depending on the process, a work gap is formed between the workpiece and the tool, through which the electrolyte solution flows at high speed, thereby removing the removal products and the heat generated by the current flow.
Schließlich kann man eine Formgebung auch mit Hilfe von Prägewalzen oder Moletten durchführen. Das Molettieren erfolgt dadurch, daß man die profilierte Oberfläche einer unter Druck stehenden Formwalze auf der zu profilierenden Fläche abformt.Finally, shaping can also be carried out using embossing rollers or molettes. Mettling takes place by molding the profiled surface of a press roll under pressure on the surface to be profiled.
Es sind nun eine Reihe von Verfahren und Vorrichtungen zum elektroerosiven oder elektrochemischen Bearbeiten von Werkstücken bzw. zum Bearbeiten von Werkstücken unter Verwendung des Prägevorgangs bekannt, wobei sich die Bearbeitung auf eine Anzahl von Werkstükken verschiedener Art, jedoch nicht auf Metallbänder bzw. Prägebänder bezieht, da in der Fachwelt ein Vorurteil gegen die Anwendung der seit langem bekannten Verfahren für die Zwecke der Formgebung oder Profilierung von Metallbändern, insbesondere von Preßbändern, bestand. Darüber hinaus bestand die Schwierigkeit, die geometrisch unbestimmte Form der Preßband-Außenfläche und deren Abmessungen so den Bearbeitungswerkzeugen zuzuordnen, daß für das anspruchsvolle Auge befriedigende Oberflächentexturen ohne Ansätze hergestellt werden konnten. Zum Stand der Technik wird dabei beispielsweise auf die DE-C-1 298 854, 1 440 999, 1 565 468 und 1 961 676, die GB-A-856 340, die FR-A-1 224109 und auf die US-A-3 042 789 und 3 363 082 verwiesen.A number of methods and devices for electroerosive or electrochemical machining of workpieces or for machining workpieces using the embossing process are now known, the machining relating to a number of workpieces of different types, but not to metal strips or embossing strips, since in the professional world there was a prejudice against the use of the long-known methods for the purpose of shaping or profiling metal strips, in particular press strips. In addition, there was the difficulty in assigning the geometrically indefinite shape of the press belt outer surface and its dimensions to the processing tools in such a way that satisfactory surface textures could be produced for the discerning eye without any approaches. The state of the art is, for example, DE-C-1 298 854, 1 440 999, 1 565 468 and 1 961 676, GB-A-856 340, FR-A-1 224109 and US-A -3 042 789 and 3 363 082.
Aus der US-A-2472863 ist schließlich eine Vorrichtung zum Perforieren von Metallbändern bekannt, bei der die zu perforierenden Bänder außerhalb des zu bearbeitenden Teiles am Außenrand mit einer Perforation versehen werden, die mit einer entsprechenden Teilung am Bearbeitungswerkzeug in Eingriff steht, wodurch eine Synchronisation von Werkzeug-und Werkstückbewegung erreicht wird.Finally, from US-A-2472863 a device for perforating metal strips is known, in which the strips to be perforated outside the part to be machined are provided with a perforation on the outer edge, which is in engagement with a corresponding division on the processing tool, whereby a synchronization of tool and workpiece movement is achieved.
Allgemein bekannt ist es auch, die Mantelfläche von Walzen zum Bedrucken und Prägen von Werkstückoberflächen mit den erwähnten Verfahren zu profilieren. Dabei werden der Umfang des Werkzeuges (oder der Elektrode bei den elektrothermischen und den elektrochemischen Verfahren) und der Umfang der zu profilierenden Walze so bemessen, daß die Rapportlänge auf den Umfang der zu profilierenden Walze in der Regel mehrfach ganzzahlig untergebracht werden kann.It is also generally known to profile the outer surface of rollers for printing and embossing workpiece surfaces using the methods mentioned. The circumference of the tool (or the electrode in the electrothermal and electrochemical processes) and the circumference of the roll to be profiled are dimensioned such that the repeat length on the circumference of the roll to be profiled can usually be accommodated several times as an integer.
Dem Erfinder stellt sich die Aufgabe, diesen bei Druck- und Prägewalzen bekannten Stand der Technik auf die Profilierung von Metallbändern, insbesondere von Preßbändern für Doppelbandpressen zu übertragen, deren Länge abweichend von den Verhältnissen bei Walzen ein Mehrfaches üblicher Walzenumfänge beträgt, und darüber hinaus nur mit großem Aufwand bestimmbar ist. Erschwerend muß für die Zeit der Bearbeitung diese Länge beibehalten oder deren Änderung stetig gemessen oder beeinflußt werden.The inventor has the task of transferring this state of the art, which is known in the case of pressure and embossing rollers, to the profiling of metal strips, in particular of press strips for double-band presses, the length of which, in contrast to the ratios in the case of rollers, is a multiple of conventional roller circumferences, and only with great effort can be determined. To make matters worse, this length must be maintained for the time of processing or its change must be measured or influenced continuously.
Die Lösung der Aufgabe wird durch die technische Lehre vermittelt, daß man am Bandrand des zu bearbeitenden Preßbandes außerhalb des zu profilierenden Teiles der Preßbandoberfläche eine Teilung vorsieht, die mit einer entsprechenden Teilung des Profilierwerkzeuges in Eingriff steht, wobei die Toilung des Preßbandrandes einem ganzzahligen Vielfachen der Teilung des Werkzeugumfangs bzw. des auf dem Werkzeugumfang liegenden Rapports entspricht, wenn dieser nicht mit dem Werkzeugumfang identisch ist, so daß der Anfang der Preßbandstruktur und ihr Ende ohne sichtbare Übergänge ineinander übergehen, und die Teilung mit elektronischen oder mechanischen Mitteln ausgewertet, eine Synchronisierung von Werkzeug- und Werkstückabwälzung bei der Abbildung des Oberflächenprofils durch elektrothermisches, elektrochemisches oder umformendes Bearbeiten erlaubt.The solution to the problem is conveyed by the technical teaching that, at the belt edge of the press belt to be machined, outside the part of the press belt surface to be profiled, a division is provided which is in engagement with a corresponding division of the profiling tool, the flushing of the press belt edge being an integral multiple of that Division of the tool circumference or of the repeat lying on the tool circumference corresponds, if this is not identical to the tool circumference, so that the beginning of the press belt structure and its end merge into one another without visible transitions, and the division is evaluated by electronic or mechanical means, a synchronization of Tool and workpiece passing through when mapping the surface profile Electrothermal, electrochemical or forming processing allowed.
Eine Zwangssynchronisierung zwischen dem Mantel der synchron angetriebenen Umlenktrommel und dem Preßband kann beispielsweise mit Hilfe von Verzahnungen bewerkstelligt werden, wie es in der DE-A-2 737 629 beschrieben ist. Dort ist an den Seitenkanten der Stahlbänder eine Verzahnung angeordnet, die in eine entsprechende Stirnverzahnung eines Hohlzahnrades an der Umlenktrommel eingreift.A forced synchronization between the jacket of the synchronously driven deflection drum and the press belt can be accomplished, for example, with the help of toothing, as described in DE-A-2 737 629. There, a toothing is arranged on the side edges of the steel strips, which engages in a corresponding end toothing of a hollow gear on the deflection drum.
Diese Synchronisierung mit dem Ziel, eine genau ganzzahlige Anzahl von Werkzeugumfängen auf dem Preßbandrand abzuwälzen, stellt sicher, daß der Anfang der Preßbandstruktur und ihr Ende ohne sichtbare Ansätze ineinander übergehen, wobei auch eventuellen als Schlupf zu bezeichnenden Erscheinungen Rechnung getragen werden muß.This synchronization with the aim of rolling an exact whole number of tool circumferences on the edge of the press belt ensures that the beginning of the press belt structure and its end merge into one another without any visible signs, taking into account any phenomena that may be referred to as slippage.
Zu diesem Zweck wird das Preßband über zwei Umlenktrommeln gespannt und über die Kantenverzahnung des Preßbandes angetrieben. Das Werkzeug oder die Werkzeugelektrode wird an geeigneter Stelle des auf die Umlenktrommeln gespannten Preßbandes zum Eingriff gebracht und in Abwälzrichtung angetrieben. Werden die beiden Antriebe mechanisch über an sich bekannte Differentialgetriebe oder elektronisch über ebenso bekannte Lageregelsteuerungen synchronisiert, dann gelingt die ansatzfreie Oberflächenprofilierung von Preßbändern für Doppelbandpressen, wobei eine bis in feinste Details gehende Oberflächenabbildung zwischen Werkzeug und Werkstück erreicht wird.For this purpose, the press belt is tensioned over two deflection drums and driven via the edge teeth of the press belt. The tool or the tool electrode is brought into engagement at a suitable point on the press belt tensioned on the deflection drums and driven in the direction of rolling. If the two drives are synchronized mechanically via known differential gears or electronically via position control controls that are also known, the surface profiling of press belts for double-belt presses can be carried out without any problems, whereby a surface mapping between tool and workpiece that goes down to the finest details is achieved.
Die Zeichnung zeigt schematisch den Abformungsvorgang gemäß dem Verfahren der Erfindung. Über die Trommel 1 ist das zu profilierende Preßband 2 gespannt, das in Pfeilrichtung 6 angetrieben wird. Mit dem Bezugszeichen 3 ist das Werkzeug bzw. die Werkzeugelektrode bezeichnet, deren Oberfläche 4 auf das Preßband 2 abgeformt wird. Die Abformung erfolgt dabei im Synchronisationsbereich 5 von Preßband 2 und Werkzeug 3.The drawing shows schematically the molding process according to the method of the invention. The
Claims (1)
- Method for the profiling of metal bands, particularly of press bands in double band presses, characterised thereby, that one provides a graduation, which stands in engagement with a corresponding graduation of the profiling tool (3), at the band edge of the press band (2) outside the part of the press band surface to be profiled, wherein the graduation of the press band edge corresponds to an antegral multiple of the graduation of the tool circumference or of the pattern lying on the tool circumference when the pattern is not identical with the tool circumference so that the start of the press band structure and its end pass over without visible transitions one into the other, and the graduation evaluated by electronic or mechanical means permits a synchronisation of rolling along of tool and press band during the reproduction of the surface profile by electrothermal, electro-chemi- calor deforming treatment.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3018759A DE3018759C2 (en) | 1980-05-16 | 1980-05-16 | Process for profiling metal strips |
| DE3018759 | 1980-05-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0040316A1 EP0040316A1 (en) | 1981-11-25 |
| EP0040316B1 true EP0040316B1 (en) | 1983-07-27 |
Family
ID=6102595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP81102726A Expired EP0040316B1 (en) | 1980-05-16 | 1981-04-10 | Method of profiling a metal strip, particularly of a band in double band presses |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4598564A (en) |
| EP (1) | EP0040316B1 (en) |
| DE (1) | DE3018759C2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CS244603B1 (en) * | 1982-05-04 | 1986-08-14 | Jaroslav Rybacek | Method of elastic elements calibrating especially of elastic washers and device for application of this method |
| GB8616240D0 (en) * | 1986-07-03 | 1986-08-13 | Renishaw Plc | Opto-electronic scale reading apparatus |
| US7293445B2 (en) * | 2003-06-13 | 2007-11-13 | General Motors Corporation | Sheet processing apparatus, method of use, and plastically deformed sheet |
| DE102011005401A1 (en) * | 2011-03-11 | 2012-09-13 | Hilti Aktiengesellschaft | Roll forming device for forming a band-shaped metal material |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR398808A (en) * | 1909-01-25 | 1909-06-15 | Metallurg De Gorcy Soc | Method and apparatus for preparing, by rolling, wire for the manufacture of points and nails with ribbed shanks |
| DE507780C (en) * | 1927-02-26 | 1930-09-19 | Frank Humphris | Process for punching various objects out of a metal sheet |
| DE505468C (en) * | 1928-07-06 | 1930-08-19 | Eisen Und Stahlwerk Hoesch Akt | Rolling mill for rolling out rolling stock by means of wave-shaped rollers |
| US1966006A (en) * | 1931-02-19 | 1934-07-10 | Tonsor Ab | Band guide for machines for the manufacture of thin razor blades from a continuous band |
| US2472863A (en) * | 1945-11-16 | 1949-06-14 | American Can Co | Apparatus for perforating metallic strips |
| BE649403A (en) * | 1963-06-17 | |||
| US3250102A (en) * | 1963-09-06 | 1966-05-10 | Continental Can Co | Rotary scoring device for continuous tube welding machine |
| US3559568A (en) * | 1969-01-14 | 1971-02-02 | Armstrong Cork Co | Method of controlling pattern repeat length |
| US3686917A (en) * | 1971-04-06 | 1972-08-29 | Toyoda Chuo Kenkyusho Kk | Roll forming apparatus |
| GB1474505A (en) * | 1974-12-16 | 1977-05-25 | ||
| DE2737629C2 (en) * | 1977-08-20 | 1982-06-03 | Kurt 7218 Trossingen Held | Continuously working double belt press |
| US4233833A (en) * | 1978-06-05 | 1980-11-18 | United States Gypsum Company | Method for stretching sheet metal and structural members formed therefrom |
-
1980
- 1980-05-16 DE DE3018759A patent/DE3018759C2/en not_active Expired
-
1981
- 1981-04-10 EP EP81102726A patent/EP0040316B1/en not_active Expired
-
1984
- 1984-07-24 US US06/634,174 patent/US4598564A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US4598564A (en) | 1986-07-08 |
| EP0040316A1 (en) | 1981-11-25 |
| DE3018759C2 (en) | 1982-05-06 |
| DE3018759A1 (en) | 1981-11-19 |
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| Date | Code | Title | Description |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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| AK | Designated contracting states |
Designated state(s): FR GB IT SE |
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| 17P | Request for examination filed |
Effective date: 19811002 |
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| ITF | It: translation for a ep patent filed | ||
| GRAA | (expected) grant |
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