Working Recycled Copper Sheet for Relief
再生铜板浮雕的杂质与表面缺陷对策
标签：再生铜, 杂质, 橘皮, 采购验收, 可持续
再生铜板（Cu ≥99.0%）含 Ni、Pb、Fe 杂质，延展性比电解铜低 10–20%，深浮雕凸起处易裂、退火后易出橘皮。对策：①采购 1 号紫铜（Cu ≥99.95%）并索取炉号成分单；②退火后晶粒控制在 0.030–0.050 mm（ASTM 晶粒度），晶粒过大表面必起橘皮；③浮雕尖角设计为 R ≥0.5 mm 圆角；④压前做杯突试验（IE 杯突值 ≥10 mm 为合格批次）。回收料价格低 15–25%，但报废率管理是盈亏关键。
Recycled copper (Cu ≥99.0%) carries Ni, Pb and Fe impurities, cutting ductility 10–20% — high spots tear in deep relief and orange peel follows annealing. Fixes: buy No.1 copper (≥99.95%) with heat-number mill certs; hold annealed grain size at 0.030–0.050 mm (ASTM scale) to avoid orange peel; round relief crests to R ≥0.5 mm; screen each batch by Erichsen cup test (IE ≥10 mm). Scrap-grade material saves 15–25% on metal, but reject-rate control decides the margin.