Conserving Cathedral Door Reliefs
修复：教堂铜门浮雕的补压与调平
标签：铜门修复, 补压, 调平, 教堂
欧洲教堂铜门浮雕常见三类损伤：撞击凹坑、整体翘曲与铆接点撕裂。修复流程：整体红外热成像定位内应力区 → 局部 400–450 ℃ 火焰退火 → 背面硅胶顶杆 + 正面铅垫反向调平（压力 ≤2 MPa 防二次变形）→ 撕裂处剪老料补片、锤纹手工补錾。希尔德斯海姆大教堂铜门（1015 年，世界最古老铸铜门之一）2010 年保养即采用该组合工艺，浮雕落差恢复到 ±0.3 mm 内，全程未取下门体。
Cathedral door reliefs typically show impact dents, overall bowing and torn rivet points. Treatment: IR thermography to map stress zones, local flame annealing at 400–450 °C, back-pressure with silicone jacks against lead-faced fronts (≤2 MPa to avoid re-distortion), then old-stock patches with hand-matched chasing. Hildesheim Cathedral's doors (1015) were maintained in 2010 with exactly this sequence, restoring relief levels to within ±0.3 mm without taking the doors down. ---