Binder-Jetted Sand Cores
粘结剂喷射 3D 打印砂芯
标签：砂芯, 3D打印, 内腔, 快速交付
复杂弯曲水道、镂空纹样铜件的传统砂芯需分芯盒制芯再组合，3D 打印砂芯 48 h 内交付且一次成型整体内腔。打印砂芯抗拉强度 1.5–2.5 MPa（可用 5–7 天），浇注黄铜前 180–220 ℃ 烘烤 1–2 h 排除水分。设计要点：壁厚 ≥6 mm、排气通道直径 ≥10 mm，与外模的芯头间隙比传统芯头放大 0.3–0.5 mm 补偿打印误差。
Traditional cores need core boxes and assembly; binder-jetted cores deliver in 48 h as one piece with internal channels intact. Printed cores hold 1.5–2.5 MPa tensile (usable 5–7 days); bake at 180–220 °C for 1–2 h before pouring brass to drive off moisture. Design rules: wall ≥6 mm, vent channels ≥10 mm, and core-print clearance 0.3–0.5 mm larger than conventional to absorb print deviation. ---