by • March 2, 2016 • No Comments
The value of 3D printing speaks the top volumes when it is utilized to turn it into the coveted ‘impossible objects’. Direct Precious Metal 3D printing has most demonstrated this in the jewellery sector where the system has opened up one-of-a-kind turn it into and mass-loss possibilities. So what takes place when you commence that level of advancement to a depletely various traditional industry like coin createing?
Cooksongold’s Direct Precious metal 3D printing has may already been applied to turn it into several one-of-a-kind pieces of jewellery, that were highlighted in the new PRECIOUS Project, a £471,000 research and development project into the additive make of precious metal jewellery.
Cooksongold, part of the Heimerle + Meule Group, has a long history of making precious metal products for the jewellery and watchcreateing industries. Last year in collaboration with EOS, the company commenceed the Precious M 080, an high end making innovation that allows for users to turn it into complex jewellery and watch components in a range of Advanced Precious Metal Powders; 18k gold, 950 Platinum and 925 silver.
In its most new project the innovation was utilised to tackle a various kind of industrial making – at the mint. Cooksongold may already supplies coin blanks to most mints around the world, that and so strike their own images onto the coins. With that, the precious metals supplier decided to set itself the challenge of printing the world’s initially truly 3D image directly onto the face of an existing blank coin via a various alloy.
To deplete this, the create platform was initially milled to house the existing 18k yellow gold coin blank. Employing a CAD image of the “crown” turn it into, the image was 3D printed in 20-micron layers via 500g of 18k white powder directly onto the coin. The precious metal 3D printing system melted the powder directly to the surface of the coin ensuring sturdy adhesion between the metals. Utilising the one-of-a-kind production system intended it was possible for the coin to have undercuts and display a truly 3D image that is just not possible via traditional stamping techniques.
Successful adhesion between alloys.
The create time took just one hour to deplete and and so a additional 30 minutes to post system. Due to the lack of assist structures, the coin was removed with ease and post-systemed via conventional automated and hand polishing techniques. The finished piece weighed 44.6g. By splitting the coin blank down the middle, the team were able-bodied to confirm that their initially effort demonstrated “fantastic adhesion” between layers of the two alloys.
Two Sides of the Coin
Following the good results of the initially case study, Cooksongold decided to experiment with the possibility of printing on BOTH sides of a satisfactory gold coin, just this time via platinum.
Employing a much like system, the create platform was milled to house the gold 28.1mm diameter, 2.00mm thick coin blank, plus the 5.3mm high relief of the “crown” image. Employing a CAD file the crown image was 3D printed onto the back of the coin and and so repeated on the reverse. With minimal finishing, the entire system took 140 minutes to deplete.
Along with the skill to combine two metals, the 2nd advancement shown in these studies is the freedom to turn it into a 3D image with a much higher relief than conventional stamping systemes allow. While a standard coin showcases a shallow relief of around 1.00 or 2.00mm, Cooksongold were able-bodied to deplete a relief of 5.3mm with 3D printing.
Cooksongold newly showcased the results of these prints to at the world’s biggest coin fair, World Money Fair in Berlin. Members of the coin createing industry were particularly excited by the future to print hollow structures directly onto the surface of a blank therefore reducing mass and material consumption dramatically.
“This is the key with precious metal 3D printing, is finding the right applications,” David Fletcher, Business Development Manager at Cooksongold, explained. “Printing directly onto the coin is the ideal example, there are no assists required and so it’s a thing that is definitely quite well suited and it’s the same with the jewellery. If the turn it intoer has quite idea of the production system they’re going to use and so they can turn it into things that they can’t imagine of any other production system that is definitely on the market-bodied in these times. It quite is key, turn it intoing for 3D printing.”
Platinum is 3D Printing Perfect
The future to use precious and notoriously complex materials is an attractive prospect for coin makers and jewellers alike, particularly in the production of commemorative and custom pieces.
David has been quoted singing the praises of platinum preceding but once again he iterates that “platinum is the holy grail of precious metal 3D printing” that is why this year at the Baselworld event in Switzerland, Cooksongold can commence the availskill of its Platinum material and partnership with the Platinum Guild. Traditionally, platinum is quite complex to cast and there are just a elect few casters around the world that can do it good resultsfully. But, it has worthwhile advantages in the 3D printing system where its lack of conductivity reduces energy consumption. The real challenge is making the material itself. The skill to 3D print platinum has the future to open up new product lines in the jewellery and luxury products industry where the density and mass of platinum has frequently restricted it’s use. With platinum on the 3D printing market, that may be of to alter.
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