CREAMY SOLDER FEEDING METHOD FOR LEAD FRAME

摘要

PURPOSE:To feed creamy solder to the clamp parts of a lead frame at a high speed and at a constant feeding quantity, by contacting the clamp parts of the tips of lead terminals of the lead frame with the creamy solder, which is continuously applied on the surface of a roller at a specified thickness, and scraping the creamy solder. CONSTITUTION:Creamy solder 4 is continuously applied on the surface of a rotating roller 11. Clamp parts 2a of the tips of lead terminals 2 of a lead frame 1 are contacted with the creamy solder 4 on the surface of the roller 11, and the creamy solder 4 is scraped. Thus, the creamy solder 4 is applied on the clamp parts 2a. For example, the creamy solder 4 is supplied in a groove 13, which is formed between the first roller 11 and a second roller 12, which are driven and rotated at a constant speed in the reverse direction to each other. The creamy solder 4 is attached to the surface of the first roller 11. The thickness of the attached solder is controlled at a constant value with a doctor blade 14. Under this state the lead frame is inclined and advanced toward the first roller 11. The clamp part 2a of the tips of the lead terminals 2 are sequentially contacted with the surface of the first roller 11. Thus the creamy solder 4 on the surface of the first roller 11 is scraped.