Detailed Analysis of Plastic Ultrasonic Welding 超声波焊接
Issuing time:2021-05-05 11:51
Ultrasonic welding is a fast, clean, and effective assembly process for assembling and processing thermoplastic plastic parts and some synthetic components. At present, the bonding between plastic products, the bonding between plastic products and metal fittings and the bonding between other non-plastic materials. It replaces solvent adhesives, mechanical sturdiness and other bonding processes, and is a mature assembly technology. Ultrasonic welding not only has the function of connection and assembly, but also has the effect of moisture-proof and waterproof sealing.
Advantages of ultrasound:
1. Energy saving
2. No need to equip the ventilation device for dissipating smoke and heat
3. Low cost and high efficiency
4. Easy to realize automated production
Working principle of ultrasonic welding machine
The ultrasonic welding device converts the current 50/60Hz electric frequency into 20KHz or 40KHz high frequency electric energy through a transistor function device, and supplies it to the converter. The converter converts electrical energy into mechanical vibration energy for ultrasonic, and the voltage regulator is responsible for transmitting the converted mechanical energy to the welding head of the ultrasonic welding machine. The welding head is an acoustic device that directly transmits mechanical vibration energy to the product to be pressed.
The vibration is transmitted to the bonding surface through the welding work piece. The vibration and friction generate heat to melt the plastic. The vibration will stop when the molten material reaches its interface. The short-term pressure can make the melt produce a strong molecular bond when the bonding surface is solidified. The cycle is usually completed in less than one second, but its welding strength is close to that of a piece of connected material.
振动通过焊接工作件传给粘合面振动磨擦产生热能使塑胶熔化， 振动会在熔融状态物质到达其介面时停止，短暂保持压力可以使熔化物在粘合面固化时产生个强分子键， 整个周期通常是不到一秒种便完成，但是其焊接强度却接近是一块连着的材料。