Jim4silver
Well-Known Member
mmissinglink said:Northerncoins said:Its the "Lube" Its all about the cost savings.... :/
"Nanotribology Application in the Coining Industry (II)Optimization of Lubricant Film Formation on Blanks*
ABSTRACT A new method has been developed to lubricate metal coin blanks during the coin production process. The lubricant is formed on the metal surfaces as a monomolecular film during burnishing, which provides an exceptional combination of chemical and tribological environments needed to promote reaction. Laboratory-scale burnishing simulations combined with surface analysis indicated the composition and nature of the films formed. A comparison of reactions on metal surfaces with and without burnishing confirmed the importance of the tribochemical process to the successful lubrication of the blanks.
Implementation of this lubrication procedure to production lines has improved the surface quality of the coins and tripled the die life, resulting in considerable cost savings.
http://www.researchgate.net/publica...zation_of_Lubricant_Film_Formation_on_Blanks*
Burnishing
Burnishing is used to make the surface of the blanks brighter, remove any discolouration and in some cases apply a minute amount of lubricant to assist in coining. This is carried out in a Burnishing Machine that tumbles the blanks amongst a mixture of small steel balls and ceramic media combined with special chemicals, which etch and polish the surface. After burnishing, the blanks pass through a hot air drier. The annealed, burnished and dried blanks are stored ready for coining.
Coining
http://www.ramint.gov.au/designs/products/circulating.cfm
Can anyone who has an institutional e-mail send me the full text of the first article from above ( http://www.researchgate.net/publica...zation_of_Lubricant_Film_Formation_on_Blanks* )? You can send it to me via PM.
Thanks.
.
Too bad they can't seem to figure out how to wash the stuff off when it's done.
Jim