| 摘要 |
A horn assembly for use in an ultrasonic welding machine, when operating with a frequency of the order of 20 KHz, with a tip amplitude of 40 to 80 microns, and under an applied load of the order of 200 Kg force, for an operating cycle of 0.6 to 1 second, comprises a horn member (32) having a profiled work-engaging surface and a further member (30) connecting the horn to a transducer. The horn member (32) is secured to the further member (30) by a stud (34) having two threaded portions (36, 38) with an intermediate smooth-surfaced portion (40) of reduced diameter. The length of each threaded portion (36, 38) of the stud is proportional to its diameter, according to the strength of the member into which it is screwed. Also, the thread of each threaded bore (42, 44) is spaced from the open end by a distance equal to not less than two turns of the thread. Further, the threaded bores are not subjected to any surface treatment. These various features serve to mitigate the tendency of the stud and/or the members to fracture. <IMAGE> |
