Case: Two-tone Chime Bells for Museum Replication
案例：编钟复制工程中的双音铸造
标签：编钟, 曾侯乙, 双音钟, 博物馆复制, 调音
1984–1985 年湖北组织复制曾侯乙编钟全套 65 件，采用传统陶范与现代树脂砂结合：钟体对口合范、甬钟带泥芯，合金按原钟配比锡 12.5–14.5%、铅 1–3%（铅过少音色尖锐、过多音色发闷）。双音来自合瓦形截面：正鼓音与侧鼓音频率差约 218 音分，铸后以砂轮在钟腔内壁磨削调音，每钟需 5–8 轮试敲与修磨，最终误差控制在 ±3 音分。
In 1984–85 Hubei replicated the full 65-bell Zeng Hou Yi chime set, combining traditional clay molding with modern resin sand: bells were cast in matched half-molds with clay cores for shanked bells, using the original alloy window of 12.5–14.5% Sn and 1–3% Pb (too little lead sharpens the tone, too much deadens it). The two-tone effect comes from the almond-shaped section — front and side strike notes differ by about 218 cents. Tuning was done by grinding the inner walls, 5–8 strike-and-grind rounds per bell, landing within ±3 cents. ---