EP1452107A1 - Münzrohling aus einer CuAlZnSn-Legierung für eine Spiegelglanzprägung und Verfahren zu seiner Herstellung - Google Patents
Münzrohling aus einer CuAlZnSn-Legierung für eine Spiegelglanzprägung und Verfahren zu seiner Herstellung Download PDFInfo
- Publication number
- EP1452107A1 EP1452107A1 EP04001141A EP04001141A EP1452107A1 EP 1452107 A1 EP1452107 A1 EP 1452107A1 EP 04001141 A EP04001141 A EP 04001141A EP 04001141 A EP04001141 A EP 04001141A EP 1452107 A1 EP1452107 A1 EP 1452107A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- embossing
- alloy
- coin
- layer
- polishing
- 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
Links
Classifications
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C21/00—Coins; Emergency money; Beer or gambling coins or tokens, or the like
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/01—Alloys based on copper with aluminium as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/04—Alloys based on copper with zinc as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/08—Mirrors; Reflectors
Definitions
- the invention relates to coin blanks made of a copper-aluminum-zinc-tin alloy, which are suitable for producing coins with mirror-embossing, and to a method for producing these coin blanks.
- a coin alloy is also known as Nordic Gold.
- the coin blank is embossed by the multiple stroke of the Embossing stamp exposed to increased thermal and mechanical stress.
- Leading Complications in coin blanks made of a CuAlZnSn alloy by a following coin blank tends to appear on a few successful glossy embossments Embossing stamps to create bonds or welds. This will result in Connection with the multiple stroke material particles torn out of the coin blank get stuck on the embossing stamp. These material particles would affect the following Weld on the coin and therefore no mirror gloss quality if the embossing is continued allow more.
- the coins have blind spots, become uneven and unsightly.
- the aim is to provide coin blanks made of a CuAlZnSn alloy, which ensure that with high productivity and in compliance with the required special physical fish and optical properties such as electrical conductivity and color shade, coins in mirror gloss quality and highest embossing quality can be achieved. There is a To develop procedures that ensure the provision of these coin blanks.
- the task is to pre-treat ordinary coin blanks from one CuAlZnSn alloy to achieve such a surface that the coinage in High-gloss mirror quality without extensive polishing work on the embossing stamp guaranteed.
- the object is achieved in that on the surface of coin blanks, which consist of a CuAlZnSn alloy, an embossing auxiliary layer is applied.
- the embossing auxiliary layer has a layer thickness of ⁇ 1 ⁇ m and preferably consists of a galvanic copper-zinc alloy with a zinc content of 20 to 40 percent by mass.
- blanks made according to the invention made of a CuAlZnSn alloy can not only be used for minting high-gloss coins, but in the same Can also be used for embossing analog parts such as medals, badges, etc.
- IACS In this special type of alloy with the very narrow ones required by the mints set salary tolerances and a prescribed electrical conductivity of According to the invention, 16.3% IACS are provided with coin blanks which have an embossing auxiliary layer have, which are made of a galvanically deposited CuZn alloy with a There is a zinc content of 25% by mass and a layer thickness of 2 ⁇ m.
- the one Coin blanks equipped with such an embossing layer guarantee the embossing of Mirror-quality coins with high productivity, d. H. the elaborate polishing of the Minting stamp is omitted because the coin blank is very stuck to the minting stamp is permanently avoided.
- the minting auxiliary layer with the base material kneaded and mixed in such a way that proof of the embossing auxiliary layer on the finished coin is no longer possible and thus the required properties of the base material are also guaranteed on the surface of the coin.
- a batch of punched coin blanks as used to mint the general payment values from e.g. 20 Eurocent is available for the embossing of nominal values in mirror gloss quality provided separately.
- the coin blanks are, as usual, first annealed, pickled and tumbled, limiting the last step to 3 minutes.
- To acid pickling with sulfuric acid with the addition of oxidizing agent and again Drum polishing with a ball mixture made of stainless steel is pretreated on the so Coin blanks in an electroplating drum using a basic copper-zinc alloy bath a CuZn25 alloy layer with a layer thickness of 1 to 6 ⁇ m galvanically deposited.
- the coated coin blanks become after going through one Rinsing stage of a short-time annealing at 600 ° C in a nitrogen-hydrogen protective gas atmosphere subjected and then dry using polishing balls in a drum polished.
- the process guarantees an effective series production of coin blanks from one CuAlZnSn alloy, which have an embossing auxiliary layer and which are used to emboss Collector's coins etc. in mirror gloss quality with high productivity ideally suited are.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Adornments (AREA)
- Electroplating Methods And Accessories (AREA)
- Chemical Treatment Of Metals (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Eine solche Münzlegierung wird bekanntermaßen auch als Nordic Gold bezeichnet.
- Münzrohlinge/ Coins, die aus der üblichen Produktion von Zahlungswerten entnommen sind, werden zunächst bekanntermaßen durch Glühen ,Beizen und Polieren vorbereitet, um eine metallisch reine Oberfläche zu erzielen, wobei jedoch die Polierzeit relativ kurz gehalten wird, um die Bildung einer "Apfelsinenhaut"-Oberfläche zu minimieren,
- die Münzrohlinge/Coins werden anschließend einer chemischen Vorbehandlung durch Säurebeizung, vorzugsweise mittels Schwefelsäure unter Zusatz von Oxydationsmittel, und Trommelpolieren in Gegenwart von Compounds unterzogen,
- anschließend erfolgt die Aufbringung einer Prägehilfsschicht auf die Münzrohlinge/Coins durch Beschichtung mit einer CuZn-Legierung, zweckmäßigerweise mittels eines galvanischen Bades, derart, dass eine Schichtdicke von 1 bis 6 µm erzielt wird, wobei die CuZn-Legierungsschicht einen Zinkgehalt von 20 bis 40 Masse-% aufweisen soll,
- die so mit einer galvanischen CuZn-Legierungsschicht versehenen Münzrohlinge/Coins werden in einer thermischen Behandlungsstufe einer Kurzzeitglühung bei 400 bis 700 °C in einer Schutzgasatmosphäre unterzogen, um mechanische Spannungen abzubauen, anhaftende organische Bestandteile auszutreiben und durch einen Diffusionseffekt eine Erhöhung der Haftung der galvanischen CuZn-Legierungsschicht auf den Münzrohlingen/Coins zu erreichen,
- in einem abschließenden Verfahrensschritt werden die Münzrohlinge/Coins vorzugsweise durch sogenanntes Kugeldruckpolieren nachbehandelt und für die Prägung von Münzen in Spiegelglanzqualität bereitgestellt.
Für die Herstellung von Euro-Münzen der Nominale 50, 20 und 10 Cent wird eine spezielle CuAlZnSn-Legierung der Zusammensetzung Cu89Al5Zn5Sn1, genannt Nordic Gold, verwendet. Derartige Münzrohlinge bereiten bei der Prägung von Sammlermünzen in Spiegelglanzqualität die eingangs genannten Schwierigkeiten, so dass eine produktive Herstellung derselben bisher nicht realisiert werden konnte.
Claims (9)
- Münzrohling aus einer CuAlZnSn-Legierung für eine Spiegelglanzprägung, dadurch gekennzeichnet, dass auf der Oberfläche eine Prägehilfsschicht aufgebracht ist.
- Münzrohling nach Anspruch 1, dadurch gekennzeichnet, dass die Prägehilfsschicht eine Schichtdicke von ≥ 1 µm besitzt.
- Münzrohling nach Anspruch 1, dadurch gekennzeichnet, dass die Prägehilfsschicht aus einer Kupfer-Zink-Legierung mit einem Zinkgehalt von 20 bis 40 Masse-% besteht.
- Verfahren zur Herstellung von Münzrohlingen aus einer CuAlZnSn-Legierung für eine Spiegelglanzprägung, dadurch gekennzeichnet, dass die bekanntermaßen durch Glühen, Beizen und Polieren gereinigten Münzrohlinge einer chemische Vorbehandlung unterzogen werden, dass anschließend eine Prägehilfsschicht aufgebracht wird und der mit der Prägehilfsschicht versehene Münzrohling eine thermische Nachbehandlung und eine Polierstufe durchläuft.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass das erste Polieren nur kurzzeitig erfolgt.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die chemische Vorbehandlung eine Säurebeizung mittels Schwefelsäure unter Zusatz eines Oxydationsmittels und Trommelpolieren in Gegenwart von Compounds umfasst.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Prägehilfsschicht durch Beschichtung mittels eines galvanischen CuZn-Bades aufgebracht wird.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die thermische Nachbehandlung durch eine Kurzzeitglühung im Temperaturbereich 400 bis 700 °C unter Schutzgasatmosphäre erfolgt.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Polierstufe ein Kugeldruckpolieren beinhaltet.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10303835 | 2003-01-30 | ||
DE10303835A DE10303835A1 (de) | 2003-01-30 | 2003-01-30 | Münzrohling aus einer CuAlZnSn-Legierung für eine Spiegelglanzprägung und Verfahren zu seiner Herstellung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1452107A1 true EP1452107A1 (de) | 2004-09-01 |
EP1452107B1 EP1452107B1 (de) | 2007-06-20 |
Family
ID=32695095
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04001141A Expired - Lifetime EP1452107B1 (de) | 2003-01-30 | 2004-01-21 | Münzrohling aus einer CuAlZnSn-Legierung für eine Spiegelglanzprägung und Verfahren zu seiner Herstellung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1452107B1 (de) |
AT (1) | ATE365003T1 (de) |
DE (2) | DE10303835A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017010913B3 (de) | 2017-11-25 | 2019-01-24 | Sack & Kiesselbach Maschinenfabrik Gmbh | Verfahren zum Betreiben einer Prägevorrichtung und Prägevorrichtung |
DE102020101908A1 (de) | 2020-01-27 | 2021-07-29 | B.H. Mayer's Kunstprägeanstalt GmbH | Münze oder Medaille |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0962544A1 (de) * | 1998-05-27 | 1999-12-08 | The Solicitor for the Affairs of Her Majesty's Treasury | Schichtverbundwerkstoff für metallische Gegenstände |
DE20117131U1 (de) * | 2001-10-23 | 2002-01-24 | Krupp Vdm Gmbh | Schichtverbundwerkstoff |
WO2004016450A1 (en) * | 2002-08-19 | 2004-02-26 | Koninklijke Nederlandse Munt N.V. | Method for the production of coins or tokens and coins or tokens thus obtained |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1015905A (en) * | 1974-09-16 | 1977-08-23 | Arthur G. Mcmullen | Nickel clad steel coinage blank |
CA1219708A (en) * | 1984-05-01 | 1987-03-31 | Michael J.H. Ruscoe | Aureate coins, medallions and tokens |
DE3522656A1 (de) * | 1985-06-25 | 1987-01-08 | Ver Deutsche Metallwerke Ag | Herstellung von muenzrohlingen |
DE3940244A1 (de) * | 1989-12-05 | 1991-06-06 | Ver Deutsche Nickel Werke Ag V | Muenzrohling und verfahren zu dessen herstellung |
CA2019568C (en) * | 1990-06-21 | 1998-11-24 | Hieu C. Truong | Coins coated with nickel, copper and nickel and process for making such coins |
EP1384413A1 (de) * | 2002-07-26 | 2004-01-28 | Münze Österreich AG | Münze |
-
2003
- 2003-01-30 DE DE10303835A patent/DE10303835A1/de not_active Withdrawn
-
2004
- 2004-01-21 EP EP04001141A patent/EP1452107B1/de not_active Expired - Lifetime
- 2004-01-21 AT AT04001141T patent/ATE365003T1/de not_active IP Right Cessation
- 2004-01-21 DE DE502004004116T patent/DE502004004116D1/de not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0962544A1 (de) * | 1998-05-27 | 1999-12-08 | The Solicitor for the Affairs of Her Majesty's Treasury | Schichtverbundwerkstoff für metallische Gegenstände |
DE20117131U1 (de) * | 2001-10-23 | 2002-01-24 | Krupp Vdm Gmbh | Schichtverbundwerkstoff |
WO2004016450A1 (en) * | 2002-08-19 | 2004-02-26 | Koninklijke Nederlandse Munt N.V. | Method for the production of coins or tokens and coins or tokens thus obtained |
Also Published As
Publication number | Publication date |
---|---|
DE502004004116D1 (de) | 2007-08-02 |
EP1452107B1 (de) | 2007-06-20 |
ATE365003T1 (de) | 2007-07-15 |
DE10303835A1 (de) | 2004-08-12 |
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