Stamping Copper-clad Aluminium Strip
铜/铝复合带冲压要点
标签：复合带材, 铜包铝, 母排, 间隙控制, 跨材料
铜/铝复合带（覆铜层占厚度 10–20%）冲压兼顾铜的导电与铝的轻量，用于母排过渡件与散热端子。工艺要点：冲裁间隙按总厚 5–8% 取，铜层在复合面侧冲裁时毛刺方向相反，落料方向须固定；凸模刃口易积铝瘤，每 5000 冲次检查抛光一次；折弯时铜层务必朝外——铝侧弯曲许用率更高，铜层朝内会起裂。后续超声波焊接要求带面无油，与无油冲压工艺天然配套。复合带比纯铜带便宜 20–35%。
Copper-clad aluminium strip (copper layer 10–20% of thickness) pairs copper's conductivity with aluminium's weight for busbar transitions and thermal terminals. Key points: blanking clearance 5–8% of total thickness; burr direction flips with the clad face, so blank orientation must be fixed; punch edges gall with aluminium — inspect and polish every 5,000 strokes. Bend with the copper layer outside — aluminium tolerates more strain, and copper inside cracks. The oil-free strip pairs naturally with ultrasonic welding downstream. Clad strip saves 20–35% over solid copper.