Defect Tree: Slip, Misalignment & Depth Drift
辊压废品根因树：打滑、错位与深度漂移
标签：根因树, 打滑, 错位, 深度漂移, 废品分析
辊压纹理废品三症状定位法：①板面"打滑亮带"→压下量超咬入角（φ80 mm 辊单道压下 ≤0.5 mm）或辊面油污，先除油再降压下量；②相邻行程错位线→导尺松动或板料翘曲，校平板料后重调导尺（间隙=板宽+0.2 mm）；③纹深沿板长渐浅→辊缝调节螺杆回松或坯料中段退火不均，锁紧刻度并每 10 m 复测纹深。某 0.8 mm 黄铜装饰带厂按此树排查后，废品率从 15% 降到 5% 以内；所有判据以拓印加深度尺数据为准，避免目测误判。
Three symptoms, three fixes: (1) slip streaks on the panel — bite angle exceeded (max 0.5 mm reduction per pass on a φ80 mm roller) or oil on the roll face; degrease first, then reduce reduction. (2) Misaligned pass lines — loose guide fence or warped stock; flatten the sheet and reset the fence at strip width +0.2 mm. (3) Pattern depth fading along the length — gap screws creeping back or uneven mid-coil annealing; lock the dial and re-gauge depth every 10 m. One 0.8 mm brass trim line went from 15% scrap to under 5%; judge everything by rubbings and depth-gauge data, never by eye.