Variant: Cold vs Warm Coining
变体：冷压印与温压印对比
标签：温压, 变形抗力, 精度, 退火
冷压印（室温）表面最佳、尺寸最稳，但需高吨位且对硬料易裂。温压印将坯料加热至 150–300 ℃（铜合金），变形抗力降 30%–50%、可压更深图文，但表面略氧化需后抛光。高硬银币宜冷压；厚大黄铜章可温压以省设备。
Cold coining (room temp) gives the best surface and tightest size but needs high tonnage and cracks hard stock. Warm coining heats the blank to 150–300 ℃ (copper alloys), cutting flow stress 30%–50% and allowing deeper relief, at the cost of slight oxidation needing later polish. Hard silver coins prefer cold; thick brass medals can warm-coin to save press capacity. ---