Author:
Alexandrino Paulo,Leitão Paulo J,Alves Luis M,Martins Paulo A.F.
Abstract
This paper presents a new finite element based design procedure for correcting the coining die profiles in order to optimize the distribution of pressure and the alignment of the resultant vertical force at the end of the die stroke. The procedure avoids time consuming and costly try-outs, does not interfere with the creative process of the sculptors and extends the service life of the coining dies by significantly decreasing the applied pressure and bending moments. The numerical simulations were carried out in a computer program based on the finite element flow formulation that is currently being developed by the authors in collaboration with the Portuguese Mint. A new experimental procedure based on the stack compression test is also proposed for determining the stress-strain curve of the materials directly from the coin blanks.
Funder
Imprensa Nacional Casa da Moeda of Portugal and IDMEC
Subject
Industrial and Manufacturing Engineering
Cited by
4 articles.
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1. Predictions of stress distribution and material flow in coining process for bi-material commemorative coin;Materials Research Express;2022-06-01
2. An improved material point method for coining simulation;International Journal of Mechanical Sciences;2021-04
3. Hybrid Additive Manufacturing of Collector Coins;Journal of Manufacturing and Materials Processing;2020-12-09
4. A new type of bi-material coin;Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture;2019-04