Metallurgy of Coins
Suhaylah AliNimmi Bhatt
Roman Savinov
Engineering 45Fall 2010
Santa Rosa Junior College
Production of Coins• Planchet Metallurgy• Die Steel Metallurgy
Microstructures (our experiment)
Planchet Metallurgy
Planchets are round disks punched from large metal sheets. (blank coin)
The sheets are formed from recycled scratch metal.
After round disks are punched out, they undergo rim formation.
Die Production Dies are
stamps used to imprint images on coins. The size of coins Made of steel
The imprint initially begins with a master art work which is then manipulated to fit the size of the die .
The process of die production involves cycles of squeezing and annealing,in order to meet service requirements.
Link: http://www.youtube.com/watch?v=QrtCcXXNcGA&feature=player_detailpage#t=242s
Final Stage The final stage in coin
production is stamping the planchets with these dies.
LINK
Analysis of Microstructures
Coins analyzed: That worked
5 euro cent
2€
1 Deuchemark
That didn’t worked
20 euro cent
5 euro centClick here to move to the next slide (works in slide show only)
And here to see the picture. Then click on picture to get back
5 euro cent heat treated and cold worked
Cold worked
5 euro cent
5 euro cent
5 euro cent
5 euro cent
5 euro cent
50X
5 euro cent
150X
5 euro cent
5 euro cent heat treated
5 euro cent cold worked
150X
2 euro coin and 1 Deutschemark
1 Deutschemark Edge150X
300X1 Deutschemark Edge
1 Deutschemark Flat 150X
2 € Inner Part Face 150X
2 € Outer Rim Cross Section
150X
Devil’s Eye 50X
300X
600X
300X
600X
References
• http://www.icollector.com/images• http://www.eurocoins.co.uk/britainblisterpack.ht
ml• http://webcache.googleusercontent.com/search
?q=cache:oDBXu-4tsu0J:ikegroup.org/IKEMETALLURGYANDY.htm+%22Metallurgy+Surrounding+the+Manufacture+of+Eisenhower+Dollars%22&cd=1&hl=en&ct=clnk&gl=us