ULTRASONIC HORN FOR ULTRASONIC WELDING MACHINE AND METHOD FOR ATTACHING BRACKET USING THIS HORN

摘要

PROBLEM TO BE SOLVED: To provide a ultrasonic horn for a ultrasonic welding machine, a horn capable of obtaining a strong adhesive strength at low cost, and a method of attaching a bracket using this horn. SOLUTION: This ultrasonic horn is so constituted that the tip end of the horn body 12 is formed with a shallow recessed part 14 whose outer circumference is surrounded by a short-legged frame 13, with a horn projection 15 provided projectingly in the center, and with the inner bottom face of the recessed part 14 formed on an annular plane part 16. This ultrasonic horn is used in integrally welding a part, where a base material composed of a synthetic resin material is welded to a bracket, by melting by pressurizing through ultrasonic horn. With a groove for receiving a molten resin formed preliminarily on the welding face of the bracket, the welding is performed while the molten resin is pushed into the groove through the annular plane part without being expanded horizontally by means of the short-legged frame of the ultrasonic horn.