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Coin metal

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Book Chapter

Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003987
EISBN: 978-1-62708-185-6
... materials used in the coining process. It discusses the coinability of metals such as steels, copper, and composite metals. The article describes the control of dimensions, surface finishes, and weight of coined items. It concludes with a discussion on processing problems and solutions. closed-die...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003183
EISBN: 978-1-62708-199-3
... or concentric forgings such as wheels and gears or for coining applications where little metal movement but high die forces are required. The practical use of these machines has been limited and is expected to remain so. Parts that can be forged in high-energy-rate forging machines also can be forged...
Image
Published: 30 September 2015
in a single movement. Metal injection molding enabled production of a very complex thin wall, overhanging structures, and a three-dimensional design with no level sitting side. Both parts are coined, machined, polished, and plated. Courtesy of MPIF More
Image
Published: 30 September 2015
Fig. 5 Metal injection molding 17-4 PH stainless steel helical gear and scissor blades (sintered density = 7.5 g/cm 3 , or 0.271 lb/in. 3 ) used in pivotal laparoscopic surgical scissors. Blades are made flat and coined in pairs to provide mating blades with the correct pre-load, relief angle More
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006259
EISBN: 978-1-62708-169-6
.... The annealing practice, however, remains the same. Coin Silver and Silver-Copper Eutectic Alloys Both coin silver (90%Ag-10%Cu, in accordance with ASTM B617) and silver-copper eutectic (72%Ag-28%Cu, in accordance with ASTM B628) alloys are used for electrical contact applications. Coin silver also...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005143
EISBN: 978-1-62708-186-3
... strips is as follows: Application Forming operations Electrical terminals and connectors Bending, stretch forming, blanking, coining, drawing Electronic leadframes Bending, coining, blanking Hollow ware, flatware Roll forming, blanking Builder's hardware Shallow and deep...
Book Chapter

Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005128
EISBN: 978-1-62708-186-3
... cracking in the flange area without harming the part. The blank should be deburred to avoid possible damage to the tooling. Drop Hammer Coining Tableware, coins, and a variety of decorative items produced in copper alloys, stainless steel, sterling silver, and other metals are commonly coined...
Book Chapter

Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001380
EISBN: 978-1-62708-173-3
... of coins by the U.S. Mint. Silver shortages in the 1960s and 1970s resulted in the introduction of coins made from new materials. These coins required a unique set of properties for acceptance by the general public and use in automatic vending machines. Copper clad with cupro-nickel was found to meet...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004035
EISBN: 978-1-62708-185-6
... the dies are made. Coining Tolerances The thickness of a forging can be closely controlled by coining after forging. Fig. 3(a) shows coining tolerances for steel as a function of the area coined. Figure 3(b) shows a close-tolerance forging coined to 38.1/37.8 mm (1.50/1.49 in.) thick. Fig...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003834
EISBN: 978-1-62708-183-2
... is another example of materials with unique properties. These materials are used throughout the world for coins because of the specific requirements of electrical conductivity and density for discrimination in coin machines. Choice of alloys and cladding ratio are varied to produce a coin with specific...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006105
EISBN: 978-1-62708-175-7
... and maximize the final density, it is not uncommon to use secondary compaction operations such as coining and re-pressing. These operations are usually conducted at 138 MPa (10 tsi) or more above the original compaction pressure. Figure 4 illustrates the impact of coining pressure on the electrical...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005127
EISBN: 978-1-62708-186-3
... be developed over a large surface. Usually, if fine surface detail is to be captured in a metal surface, it is done with the high-pressure forging process known as coining. Coining pressures usually operate only on small areas (such as coins). High-velocity forming techniques offer the ability to perform...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005620
EISBN: 978-1-62708-174-0
... an important application, with thermostats taking many complex forms and finding use in furnaces, color televisions, cars, and numerous industrial controls. Fig. 3 Metallographic cross section of the edge of a cupronickel-clad copper coin A key cladding application is the production of coins...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006119
EISBN: 978-1-62708-175-7
... when necessary. Secondary operations include: Tumbling to remove burrs Re-pressing (coining or sizing) to improve dimensional accuracy Resin impregnation to close or seal porosity Peening for surface modification Annealing or heat treating to alter the mechanical or corrosion...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006017
EISBN: 978-1-62708-175-7
... that the reduced metal could be sintered into a compact. Osann then developed a process for making impressions of coins from copper powder produced by the reduction of precipitated copper carbonate (Cu 2 CO 3 ). Osann found that reduction was best done at the lowest possible temperatures that could be used...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006055
EISBN: 978-1-62708-175-7
... 1 Secondary operations commonly performed on metal injection molding components Operation Purpose Machining/grinding Bring tolerances into specification or create new features Coining/sizing Move part material to print specification (e.g., opening a slot that has closed...
Book Chapter

Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001087
EISBN: 978-1-62708-162-7
... Precious metals are of inestimable value to modern civilization. Their functions in jewelry, coins, and bullion, and as catalysts in devices to control auto exhaust emissions are widely understood. But in certain other applications, their functions are not as spectacular and, although vital...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004005
EISBN: 978-1-62708-185-6
.... Extrusion process design has to allow for this variation. If precise shape is required, then the billets have to be coined to desired dimensions in a press. In shearing, the ends of the billet are work hardened and consequently their ductility is reduced. Another billet-cutting method is the adiabatic...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006138
EISBN: 978-1-62708-175-7
... Eletrochemical machining Copper Resistance welding electrodes Copper, dispersion-strengthened copper Ordnance Armor-piercing cores Copper Fuse parts Brass Projectile rotating bands Copper, brass Other equipment or uses Business machines Brass Coins, metals, medallions Copper...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006091
EISBN: 978-1-62708-175-7
... because the dispersed phases do not form a refractory skeleton. Silver-Nickel Composites One of the elements typically combined with silver by PM processes is nickel. Nickel is more effective as a hardening agent than copper; consequently, silver nickel is considerably harder than coin silver...