Ultrasonic plastic welding machine is suitable for connecting injection molded parts, inlaid leather, non-woven fabrics and textiles, riveting heterogeneous materials to each other. The machine mainly consists of active parts and passive parts. The active components include an ultrasonic generator, a transducer, a horn, an ultrasonic mold, and the active component generates sound waves which are then conducted into the weldment. Passive components are used to withstand the forces generated, holding the weldment in the correct position, primarily supporting the weld.
The basic components of the ultrasonic plastic welding machine:
1, ultrasonic generator
The sonotrode generates high voltages of the respective desired ultrasonic frequencies from the connected supply voltage. All data related to the welding process are accurately measured and evaluated. The generator protects the vibration system from overload, maintains amplitude (welding head movement) constant and compensates for the vibration behavior of the respective weld head.
2, ultrasonic transducer
The transducer is the interface between the electrical and mechanical environment. It uses the inverse piezoelectric effect to convert electrical vibration into mechanical longitudinal vibration and transfer it to the horn and the horn.
3, ultrasonic horn
Ultrasonic horns, often referred to as Boosters, are capable of expanding or reducing the amplitude produced by the transducer. Since the horn is installed at the zero node position, the horn can be fixed to the ultrasonic welding machine through the zero node position to avoid the vibration arm offset and transmit the welding force.
4, ultrasonic mold
Ultrasonic molds, many known as welding heads, transfer mechanical vibrations into the weldment, that is, they couple the ultrasonic vibrations. Depending on the geometry, the weld head can also amplify or reduce the amplitude.
The transducer, the horn and the welding head together form a so-called vibrating arm. The vibrating arm always matches the geometry of the contact surface of the plastic material and the weldment.
Passive parts:
Counter or bottom anvil
Ultrasonic plastic welding refers to the mutual connection of materials in the weld joint. Under the action of the force, the longitudinal vibration is introduced into the plastic at a frequency of 20 kHz, 30 kHz and 35 kHz and a head amplitude of 5 μm to 50 μm. Ultrasonic vibrations are gathered by the special structure of the weldment and the mold. These special structures in the weldment are referred to as the conduction angle. The contact points in the joint region are deformed in a targeted manner by the input high-frequency energy. Friction between the contact surface and the interior of the molecular chain generates heat that melts the material.
2018-03-29
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