Ultrasonic welding quality control method and application thereof in automatic production line

Abstract

The invention discloses an ultrasonic welding quality control method and application of the ultrasonic welding quality control method in an automatic production line, and the method comprises the steps that sound signals in the composite material melting process are obtained, and the melting state of a foaming material and non-woven fabric is judged according to the sound signals; when the amplitude-frequency curve characteristic of the sound signal is that the sound loudness is lower than the fusion welding state, and the frequency is concentrated on the vibration frequency of an ultrasonic generator, the foam material and the non-woven fabric are not subjected to fusion welding; and when the amplitude-frequency curve characteristic of the sound signal is that the sound loudness is improved compared with the sound loudness in a non-fusion welding state and a plurality of regular peak values appear when the frequency is lower than the ultrasonic vibration frequency, the foam material and the non-woven fabric are subjected to fusion welding. The ultrasonic welding quality control method can also be integrated in an automatic production line and is used for controlling start and stop of the automatic production line and monitoring the stability of welding quality. The method has the advantages of being simple in implementation method, high in recognition rate, low in equipment cost, low in maintenance cost and the like.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic welding and relates to a quality control method, in particular to an ultrasonic welding quality control method and its application in an automatic production line. Background technique [0002] The foam material has the characteristics of light weight, high elasticity, vibration absorption, high specific strength, and heat preservation. The non-woven fabric has the characteristics of softness and skin-friendly. The composite material composed of these two materials has the characteristics of both, and is widely used. Used in clothing, packaging, sports and leisure industries. [0003] At present, ultrasonic technology is widely used in the welding of various materials. The welding principle is to use ultrasonic transducers to convert electrical energy into mechanical energy, and then use the horn to transmit the mechanical energy vibration energy to the welding head. , The welding head is atta...

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Problems solved by technology

[0005] Based on the change of the elastic modulus of the material, the researchers tried to judge the welding quality by the pressure between the welding head and the mold. However, this welding quality judgment method requires a cumbersome height adjustment process, pressure sensors, and position sensors (CN111014941A, CN101544060B)

In addition, for soft materials such as foam materials that are prone to oversoldering or desoldering, the required pressure sensor needs to be very accurate, which undoubtedly increases the initial cost and maintenance cost of the equipment

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