How to make medals for champions
• How to make medals for the Champions
A few days ago I was able to visit the jewelry factory "Adamas", where I saw the medal is made of the youth World Cup of Hockey 2015, which will be held from 24 to 30 August in the Sverdlovsk region.
The birth of the medals begins in furnaces, where melted the bronze and silver. semicontinuous casting cast thick sheet metal. In the casting process air pores can be formed therein, and to avoid this, the metal sheet is rolled on multi-ton mill.
Further, from the rolled metal sheet manufactured preform medals - square plate 150h150h12mm (each weighing about 2, 5 kg.) Are placed in an oven where heated with a protective atmosphere to 180 degrees Celsius and kept for 2 hours to remove the the internal stress in the future medals. Then, the preform is cooled slowly.
After cooling, the preform falls first on a lathe where the washer is cut out.
The first stage of processing.
By the way, unlike the Olympic medals, where silver and gold medals are made of silver, these medals are made of bronze. In the final stages, they are covered by electroplating with silver and gold.
Then, the medal falls on the second machine, higher precision, where the trimming of the preform. Housing diameter coin after these operations is 8 cm, thickness 10 mm.
Then chordal circumference medals are performed necessary for rigid fixation processing sections, after which the medal is mounted on the desktop precision milling CNC machining center, wherein the method of high-speed milling (Hight Speed Milling) is performed applying patterns and symbols, engraving names and symbols Cup and Club, the year of the competition.
At the same machines pocket milling is performed by mounting the tape.
In this piece, attached to the machine, you can see the specified characteristics.
The output of faceless washer turns into a medal, but it's certainly not all.
For the production of the coin used all kinds of tools.
Desk turner, nothing unusual is not it?)
The next step - drilling holes for fastening pins, fixing tape.
On this piece of curious can learn all the stages of production of the medals.
After the hole for milling cut, gets a medal on precision surface grinding, in which the master grinds obverse and reverse body medals, to give the desired texture of the obverse and reverse of the coin.
The medal is attached with special magnets.
Then it passes on the grinding wheel over and over again.
grinding procedure is over, it is time to take the ultrasonic bath, to throw off all medals pollution. In fact, the medals are hung and immersed in a liquid, no one holds them all the time before the end of this stage.
And here is the usual monster fruit of imagination of local artists to hide unwanted objects) from the eyes of journalists.
Then the coin hit the tumbling. A very interesting process. Here in vibrogaltovochnom drum with fillings of high, chromium-manganese stainless steel and special detergents housing medals polished and acquires a smoothness and shine.
After these tortures medal reaches the grinder, which produces pre-treatment The edge of the coin - the preparation of the surface for polishing. Photos of reportage about Olympic medals.
And after grinding Edge medal falls into the polishing machine, which is usually polished gold chains, which are produced here in the factory, "Adamas"
After polishing medal once again gets in an ultrasonic bath.
Further, the application of silver and gold coating on the hull medals by electroplating. Finalized with the housing future coin applying a special protective coating comprising particles nanoceramics. This allows you to keep the medal from the external environment and provides high resistance to mechanical damage. After which the coin placed in the refrigerator.
In the final stage for the medal ribbon attached.
This is done by means of pins: technical solution similar fastening bracelet wristwatch. The tests undertaken, in particular a tension load of 100 kg. allow us to guarantee the reliability of this type of attachment. Photos from last reportage about Olympic medals.
The obverse of the coin.
Reverse. In total 120 medals will be produced for the World Cup - team kits bronze, silver and gold medals. medal weighs 280 grams. diameter - 8 cm Collectively manufacturing the same coin manufacturing cycle is about 12 hours..