The Design
Making the Mold
For 2-dimensional medals this whole process can be skipped. The final drawing can be used directly to produce the necessary tools for making the coining die, thus cutting the cost of die making tremendously.
Making the Steel Coining Die
Using the tools produced in the previous phase, a die is produced. The die goes through several procedures before it can be used as a coining die. It may need to be turned off to be accommodated in the minting collar and minting press. The die surface may need to be smoothed as well. Finally, the die is heat-treated to harden it. The exact optimum degree of hardness must be achieved in order to avoid cracking the die under strong pressure while striking.
Making The Steel Cutting Die
If your medal has a special shape, then a cutting die has to be produced. Producing cutting dies is a costly process, so unless you have clear reasons, we highly recommend that you choose a circular shape, better yet one of our standard sizes.
Getting Ready For Minting
Minting
The minting press utilizes very high pressure (e.g. 500 tons), to impress upon the blanks a negative motive of the die. After fixing the top and bottom dies in the minting press, blanks are fed to the press and are stamped on both sides at once. If the medal is required to have a low relief then one strike is enough, however, Proof or High Relief medals may be struck two or more times. After each strike, the medal must be heat treated to reduce its hardness.
Finishing
Depending on customer requirements, different procedures are used to produce different types of medals. Minted medals can be gold plated, silver plated etc... They can be chemically treated (artificially oxidized) to give them an antique appearance, sand blasting may be required, surface polishing may be applied, even hand color-filling may be required.
By Abdallah Absi
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