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<p>[QUOTE=&quot;Clawcoins, post: 3363623, member: 77814&quot;]·&nbsp; Denver facility engineers calculated <u>that doubling the one-cent coin die life</u> would save $2660/day for production rates equivalent to the monthly average at the Denver facility during 2011, i.e., <u>200M one-cent coins per month</u>.</p><p><br /></p><p><br /></p><p>·&nbsp; Longer die life for other denominations was of lower importance to the production staff. The die life (as measured by the number of die strikes) is shorter for the other denominations; however, due to the smaller annual quantities produced, die life improvements for these other denominations would have less overall impact on production rates and production costs.</p><p><br /></p><p>·&nbsp; One area of potential future die research is the use of optimized physical vapor deposition (PVD) coatings for coining dies. Both the Royal Mint and the Royal Canadian Mint have developed such coatings; both of these mints contend that the coating improves die life in their operations.</p><p><br /></p><p><br /></p><p>Chrome nitride PVD coatings have been used in the United States Mint since 2009 to improve die life of numismatic dies where wear is the major failure mode. A number of coining tests were conducted in 2010–2011 with chrome nitride PVD-coated circulating dies that demonstrated no significant improvement where fatigue is the primary mode of failure. Coining tests of specially formulated low coefficient of friction PVD coatings are scheduled for 2012, with the goal of improving fatigue die life. This is another area where better understanding of design features and die stresses could be used to develop a more scientific approach to improving production practices.[/QUOTE]</p><p><br /></p>

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