Metallurgy of Coins Suhaylah Ali Nimmi Bhatt Roman Savinov Engineering 45 Fall 2010 Santa Rosa...

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

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