Binder-Jetted Sand Molds Direct Pouring
3D 打印砂型直接浇注
标签：3D打印砂型, 喷射粘结, 免起模, 复杂内腔
粘结剂喷射（Binder Jetting）3D 打印砂型可免起模直接浇注，适合带复杂内腔与逆向拔模的铜件。打印用覆膜砂粒径 70–140 目、固化后透气率控制在 80–120 CU；浇注黄铜 (C36000) 型温室温即可、浇温 950–980 ℃。打印分型面无需加工，但内浇道位置需按传统原则手工修正；浇注后落砂性能优于呋喃树脂砂，残留粘结剂 500 ℃ 即分解。
Binder-jetted 3D-printed sand molds pour directly without pattern drawing, ideal for copper parts with complex cavities and reverse draft. Use coated sand of 70–140 mesh with permeability of 80–120 CU after curing; pour C36000 brass at 950–980 °C into a room-temperature mold. No parting-face machining is needed, but gate positions should still be hand-corrected by traditional rules; shake-out is easier than furan resin sand since the binder decomposes at ~500 °C. ---