引线成形, 相位相关法, 点到弦距离累积, 准刚体运动, 拟合圆圆心

The video of wire bonding was divided into continuous image sequences. The trajectories of capillary and wire’s kink points were obtained by phase correlation algorithm and chord-to-point distance accumulation technique respectively. The velocity distributions and rotation angles of capillary and kink points to the first bonding were calculated according to the trajectories. The correlation rules of capillary and wire movement were obtained by analyzing their rotation angles and velocity distributions in wire bonding. For the capillary falling stage is circular motion, the circle center positions of locus circles were obtained by fitting the falling stage trajectories. The corresponding relation between circle center positions and wire profiles was found. The proposed method provides valuable reference for further studying the dynamics characteristics of the capillary and wire in the wire bonding looping formation.