How the military coin pattern is formed?

The billet can become a coin after being stamped. At the same time as the coin is stamped on the billet, the design and mold-making work has begun in another mold-making workshop. So how is the pattern of military coins formed? The following is a detailed introduction.

Mould and its working principle

Actual operation

Mould and its working principle

People who don’t know much about metallurgy can hardly imagine that a coin can flow around like a liquid, but this is an objective fact. It means that solid metal can move and deform under pressure, just like putting a piece in an automobile factory. (Piece) The steel plate becomes like a car-shaped steel frame with various curved shapes.

To turn a piece of metal into a coin with a pattern requires the help of a mold, and it has two molds on the front and the back. Because the forces of physics are mutual, that is, the force is equal and the direction is opposite. No one can make a metal blank. Put it in the air to mint coins.

Actual operation

The actual operation method is to fix one of the molds and place the blank cake on it and press the other mold that can move up and down so that the two sides of the blank cake are simultaneously imprinted under the action of mutual force. pattern. The mold is generally made of special steel, with a pattern engraved on the surface and a hard texture, which can make the surface of the coin appear mirror-like during the casting process. The original mold was made by hand, and the engraver used special tools to sculpt characters, numbers, and various patterns on the surface of the mold with difficulty. With the advancement of technology, nowadays, equipment and processes such as engraving machine electroplating and computer-aided design are commonly used in mold making to replace manual work, and the efficiency and accuracy have been greatly improved.

Because the surface of the coin is embossed with a mirror effect, every part of the pattern on the surface of the working mold is recessed, which is the so-called "female mold". For ease of understanding, here is an example of covering a coin with a piece of aluminum foil, repeatedly scraping and pressing with a wiper, and then removing the aluminum foil. You will find that the side of the aluminum foil contacting the coin has a recessed pattern. This is because The pattern on the surface of the coin is convex. In the same way, if the pattern on the surface of the coin is concave, the pattern on the surface of the working die is correspondingly convex.

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