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Process of manufacturing (stamping) of collection coins

There are three basic types of coins. Coins being in circulation which we use, bullion coins, for investment of capital and collection coins - the high-quality gold and silver coins manufactured in honour of significant events.

The Mint manufactures collection coins from silver bullion, and also from production wastes of other silver coins. Silver gets to the foundry furnace with temperature in 1150 degrees of Celsius. Then from the fused silver mould a continuous bar in the thickness of 4 sm and in the width 12 see

a silver Bar

The Machine tool cuts it on separate bars in length about 180 Each bar see the camp which two platens flatten out a bar gets in blooming putting pressure to equal 8 tons. To receive a strip in the thickness of 12 mm a bar pass through a camp to 12 times. The fair camp does a strip of even more thin, leading up it to a thickness of a coin. Then the stamping press manufactures preparations of coins. The remained silver again send in a flowing furnace for manufacturing of new silver bars. After that preparations get on the machine tool, the rotating which wheel squeezes out acting shoulder on their edge. Then preparations appear in the tank filled with scours, water and small steel balls.

the Tank of washing of preparations of coins

Balls act in a role of abrasive glazing preparations. Then workers manually wipe preparations by towels that on coins there were no spots from water. In the course of manufacturing and processing of coins silver becomes fragile, so fragile that easily breaks, therefore at a following stage metal gets to the furnace for annealing.

The coin Sketch represents drawing, a photo or a combination of that and other. The artist uses the computer program for collage creation.

the coin Sketch

After the definitive sketch is approved by representatives of a mint, it is possible to start cliche manufacturing. The gypseous disk in diameter of 27 sm undertakes, the engraving car operated the computer transfers on it the computer sketch, transforming it from two-dimensional into the tridimensional. Thus there is a gypseous breadboard model of a coin. Then the artist manually corrects some details. After that the negative plaster mould is moulded. With its help receive a positive die from rubber. By means of the rubber form mould a negative die from black epoxy resin.

the Form from epoxy resin

The Form from epoxy resin position on the device which is called as a pantograph and intends for reduction of the sizes of the plotting. The pantograph cuts out the copy of the form reduced in 1,5 time in bronze. Then the engraver concludes furnish of the bronze form under a microscope. Besides it finishes inscriptions with instructions of year, nominal value and the country. It is followed by the next reduction of the size by a pantograph. The reduced plotting from bronze model is transferred on a high-quality steel forming a matrix - a negative die having the size of a coin. Then the plotting from a matrix is transferred on a steel bar forming a positive die. Then a positive die transfer on other bar of a steel to receive a negative die which is called as a cliche.

Collection Canadian dollar

Coins produce one for other on a stamping press. They are minted by means of two cliches, on one for each party, one is under preparation, other over it. Both parties simultaneously not are minted by one, and two blows to supply a choice quality.

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