Case: Recycled Sheet for Public Sculpture
案例：再生铜板手工起凸公共艺术件
标签：再生铜, 公共艺术, 可持续, 起凸案例
某城市广场 2.6 m 高铜雕采用 100% 回收铜板（1Cr 杂质控制在 0.15% 以内）起凸成形。再生料退火后晶粒略粗（0.06–0.09 mm），开裂风险比电解铜板高，工艺上把每道次变形量从 20% 降到 12%、退火频次加倍，最终零开裂完成。表面保留锤目纹理经抛光后做自然氧化，两年后铜绿均匀。材料成本较电解铜降 30%，碳足迹证书记录全过程。
A 2.6 m public sculpture was raised from 100% recycled copper sheet (impurities ≤0.15%). Recycled stock anneals to coarser grains (0.06–0.09 mm) and cracks more easily than cathode copper, so per-pass reduction was cut from 20% to 12% with doubled annealing frequency—completed with zero cracks. Hammer marks were polished lightly and left to weather naturally; patina evened out within two years. Material cost fell 30% with a documented carbon footprint. ---