Is the ultrasonic plastic welding machine efficient?
We all know that the welding technology of plastic ultrasonic appeared in the United States in the early days. In recent decades, with the rapid development of a large number of plastics and composite materials, industrial production and daily life, the emergence of the electronics industry and the emergence of new high-power sensors, ultrasonic plastic welding machines have high efficiency, good welding quality, easy automation, and are suitable for large-scale production. Advantages and excellent applications have become common plastic welding methods. Let us understand the four stages of ultrasonic welding.Stage 1: The welding head contacts the parts, pressure and vibration is started. Friction heat melts into the guide, and the melt flows into the bonding surface. As the distance between the two parts decreases, the welding displacement (reduced due to the distance between the two parts due to the flow of the melt) increases. The initial welding displacement increases rapidly, and then slows down when the molten guidelines spread and slow down when contacting the surface. In the solid friction stage, heating is due to friction energy between the two surfaces and internal friction. Friction welding allows polymer materials to be heated to their melting point. Heat generation depends on frequency, amplitude and pressure.
Stage 2: The increase in melting speed leads to an increase in welding displacement and contact between the two leg surfaces. This stage forms a thin molten layer, and the thickness of the molten layer increases due to continuous heat generation. The heat in this stage is generated by viscosity dissipation.
Stage 3: The thickness of the solution layer in the weld remains constant, accompanied by a constant temperature distribution.
Stage 4: After setting the time or specific energy, power level or distance, disconnect the power supply, the ultrasonic vibration stops, and enter the 4th stage. Keep the pressure on the joint surface to squeeze out part of the melt. A large displacement is achieved when the weld cools and solidifies, and molecular diffusion occurs.
Post time: 09-27-2024