The ultrasonic welding horn design

The ultrasonic welding horn design

1. The ultrasonic welding horn is a welding horn that transmits the working force. The ultrasonic welding horn must perform strength calculation to ensure the safety and reliability of the welded structure. Ultrasonic welding horns are more common in daily use, and their main features are to ensure the normal operation of the welding work, which is indispensable. This is the working joint.

2. When designing ultrasonic joints for solder joints, it is required that the solder joint strength must meet certain requirements. It is necessary to design a reasonable solder joint structure while maintaining the appearance as beautiful as possible. There is no limit to the distance between the solder joint and the edge of the board. Solder joints can be arranged along the edge. The distance between the solder joints can be arbitrarily selected. It can be overlapped and repeatedly soldered (repaired). The distance between each row can also be selected as needed. There is no shunt problem in resistance spot welding.

3. Welding interface design In order to concentrate energy during the welding process, shorten the welding time and improve the welding quality, the design of the welding interface is very important, mainly in the following forms. (2) Stepped interface In order to improve the welding force, it can be designed as a stepped welding interface (W is the width of the plate). The triangular flange can melt the flange material and flow into the reserved pores, which can generate large shear stress and tensile force. Strength, this design also avoids weld marks on the outer surface. (3) Concave-convex plug-in interface, the material to be welded is designed to have a concave-convex form with a triangular flange. There should be a gap between the two weldments, and the wall of the convex weldment should have a certain inclination so that the plastic parts can be easily assembled. At the same time, let the molten material have a flowing space so as not to overflow the outside. In the joint design of ultrasonic welding, attention should be paid to controlling the resonance of the weldment. When the upper acoustic pole introduces ultrasonic vibration to the weldment, if the natural vibration frequency of the weldment in the vibration direction is equal or close to the frequency of the ultrasonic vibration introduced, it may cause resonance of the weldment, and the result often results in the welded joint. Shedding, in severe cases, can cause fatigue fracture of the weldment. A simple way to solve the above problem is to change the relative position of the weldment to the vibration direction of the acoustic system, or to change the natural frequency of the weldment.