3D MODELING AND FEM ANALYSIS ON METAL COIN EMBOSSED EDGE LETTERING DIES

Cornel Cătălin GAVRILĂ, Mihai Tiberiu LATEŞ

Abstract


Generally, the metal coins striking consist in high loads pressing the half-finished metal round blank using negative dies. Mainly introduced as security feature against forgery, the embossed edge inscription was manufactured at mainly coin striking, using also the negative edge die relief. In Romania, the embossed inscription on edge was firstly used in 1881, to strike the former 5 lei silver coin. Due to some varieties given by literature on this device inscription, as letters and character number, the paper purpose is to determine the possible reason for these changes. In present days, modern methods as 3D Modeling and Finite Elements Method, allow to analyze these subjected die edge varieties. The obtained results led to some useful conclusions about the motivation behind this edge lettering changing. On their turn, the conclusions are useful to an improved approach to future numismatic evaluation on the subjected coin varieties.

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References


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