Factors affecting the quality of ultrasonic welding equipment

The evaluation index of ultrasonic plastic welding has two welding compressive strength and welding accuracy. The welding accuracy mainly considers the geometrical accuracy and conductivity quality of the weldment thickness, such as the specification accuracy, the appearance accuracy and the consistency of the surface layer of the joint. There are many factors that endanger the compressive strength and accuracy of welding. The research on welding influence factors will help everyone grasp the law of welding.

1. Amplitude

The vibration amplitude of the mechanical equipment output by the acoustic material system software is the main parameter of the processing technology that is mainly selected during the ultrasonic welding of plastics. From the perspective of plastic voiceprint recognition, because of its different chemical properties, the hot rate and heating rate of the plastic with the welding vibration amplitude are different. Each raw material has a small amount of vibration amplitude that can be melted. If the vibration amplitude is not enough for the plastic It is difficult to achieve the melting temperature, so the welding compressive strength of the plastic is closely related to the vibration amplitude.

2. Time

Ultrasonic time refers to the longer time from the beginning of the ultrasonic wave to the end of the ultrasonic wave. The longer the time, the greater the kinetic energy transmitted to the product workpiece, the higher the temperature of the product workpiece, and the more melted plastic, but too long The time will cause the surface temperature of the product to rise and cause dryness, and it will continue to cause burrs, destroy the surface of the part, and prevent the non-welded surface of the welding zone on the product workpiece from causing "sticky edges"; too short a time, plastic can not be The melting or melting amount is too large, and the product workpiece cannot be welded reliably.

3. Holding pressure time.

The pressure holding time refers to the time that the release of the ultrasonic wave has long been terminated, and the welded parts are close to each other under the working pressure effect, and the period is dry. The purpose of pressure holding is to make the weldments under a certain working pressure. Close to each other, so that the melted raw materials on the surface of the two weldments can penetrate into each other, and the two products can be welded together.

4. Turn on working pressure

The opening working pressure means that the ultrasonic kinetic energy is transmitted to the product workpiece, and the working pressure on the Honda Civic crossbow is larger and the working pressure of the ultrasonic mold is reduced. After the product workpiece touches, the working pressure is created on the product workpiece, making the welding surface inseparable If the working pressure is too low, the surface cannot be inseparably touched, and the ultrasonic wave cannot cause the product to melt when the workpiece touches the surface, or only a part of it. Melting occurs, but it doesn't mean touching a part without melting. That would endanger the quality of welding.

5. Welding working pressure

Generally speaking, it is necessary to solve the problem of applying sufficient working pressure to the product workpiece, so that all the fusion surface layers have a good touch. If the working pressure is too low, the welding time will be increased, which will cause welding marks on the product workpiece or poor quality ; Working pressure is too high to crack the welding surface of the product workpiece, make the page fusion poor, and endanger the welding compressive strength and welding quality.

Many of the above factors can be adjusted according to the welding machine. Among them, ultrasonic time, ultrasonic working pressure, and maintaining working pressure time are all factors that affect the quality of ultrasonic welding machine equipment.