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Investigation of heat treatment strategies for improvement of production capacity of coin stamping dies

Nanang Ali Sutisna, Fahyudha Permana

Abstract:This paper presents a study on the production capacity of stamping dies for minting coins under different heat treatment processes, particularly austenite temperatures, using a vacuum furnace. The specimen material is made from Bohler K340 steel. The first heat treatment strategy in this study includes heating the specimens to a stable austenite temperature at 1080°C, and they are held for 120 minutes and cooled rapidly with gas quenching media with a pressure of 5 bar. Then they are tempered using single tempering at 500°C. The second strategy is similar to the first one, except that the heating temperature is at 1060°C and is tempered using double tempering at 575°C. After the heat treatment process, microstructure observation and hardness testing are carried out. Finally, the production of the die capacity testing on the coining machine is conducted. The results of the specimen surface photographs of the two heat treatment strategies show a significant difference in the microstructure similarly with the hardness value obtained from single tempering was 61.98 HRC and from double tempering was 57.94 HRC. The production capacity test result shows that the average capacity of first and second dies are 101,250 coins and 171,150 coins, respectively. This means that the second dies to exceed the minimum standard production capacity of dies as determined by the Quality Control department, which is 150,000 coins.
Keywords: coins / dies / heat treatment strategies / production capacity / tempering

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