Striking Japanese Modern Commemorative Coins
日本现代记念硬货的压印工艺
标签：日本造币局, 记念硬货, 彩色币, 压印精度
日本造币局（Japan Mint，1871 年设于大阪）的记念硬货以微细浮雕和彩色封装著称：千円银币浮雕深度仅 0.12–0.15 mm 却分 4 级台阶，采用坯料真空退火（650 °C、10⁻³ Pa）+ 双次压印（预压 200 t、精压 500 t）实现镜面 proof 底。彩色币在压印后静电喷涂上色再 UV 固化。模具浮雕仍以雕刀手工修整并保留匠人终检环节。
The Japan Mint (Osaka, est. 1871) is famed for fine relief and color coins: the 1000-yen silver proof carries 0.12–0.15 mm relief in four stepped levels, achieved by vacuum-annealing blanks (650 °C, 10⁻³ Pa) and double striking (200 t pre-strike, 500 t finish) for a mirror proof surface. Color coins are electrostatically painted after striking and UV-cured. Dies are still hand-retouched with gravers, keeping a final artisan inspection.