A Welding Quality Evaluation Method of Ultrasonic Welding Machine Based on Vibration Data
A technology of ultrasonic welding and welding quality, which is applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., and can solve the problems of not being able to truly reflect the welding condition of the weldment at the welding seat, wasting manpower and material resources, and being unable to detect products. Achieve the effect of overcoming the expensive monitoring system, saving manpower, and small transformation
Active Publication Date: 2022-06-21
XIAMEN NIELL ELECTRONICS
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At this stage, the welding quality of the batch of weldments is mainly evaluated by sampling tensile tests for lithium battery weldments. This method is a destructive test, which wastes manpower and material resources, and cannot fully test the product, and is prone to missed inspections. question
Some welding machine manufacturers try to evaluate the quality of weldments through the changes of the built-in voltage, current, and air pressure parameters of the welding machine. However, this monitoring method focuses more on monitoring the stability of the input process parameters of the welding machine, which cannot truly reflect the welding seat. The welding condition of the weldment, and the current ultrasonic welding machine with built-in monitoring sensor is expensive and cannot be promoted in a large area
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[0031] Based on the mechanism of vibration response, the present invention proposes to realize the evaluation of welding quality through the vibration data characteristic index of the welding seat during the welding process. The vibration response of the welding seat of the welding machine is related to the excitation force and the transmission path of the system. The excitation force comes from the high-frequency excitation force generated by the inverse piezoelectric effect of the piezoelectric ceramic inside the transducer, and the amplitude and duration of the high-frequency excitation force It is related to the input process parameters such as amplitude and energy; and the system transmission path is related to the input pressure, the installation state of the welding head and the welding seat, and the physical characteristics of the input weldment. When the process parameters, the installation state of the welding head and the welding seat, and the physical properties of ...
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A method for evaluating the welding quality of an ultrasonic welding machine based on vibration data, comprising: arranging two vibration acceleration sensors on the welding seat, when the welding machine input process parameters are adjusted, the assembly line enters the normal operation state, and the acquisition card takes the first m Calculate the vibration indicators of the two vibration acceleration sensors for normal samples; solve the 99% confidence interval for each indicator obtained for normal samples according to statistical theory; Calculate the vibration index of each weldment, and compare it with its threshold range. If it is within the threshold range, it is judged as normal welding, and if it exceeds the threshold range, it is judged as welding abnormality. The invention has little modification to the welding machine, does not affect the normal operation of the welding machine, has strong versatility in the welding quality evaluation scheme, saves manpower and material resources at the same time, and meets the actual needs of a fully automatic production line.
Description
technical field [0001] The invention belongs to the technical field of ultrasonic welding machines, and in particular relates to a method for evaluating the welding quality of ultrasonic welding machines based on vibration data. Background technique [0002] The main components of the ultrasonic welding machine are: high-frequency generator, transducer, horn, welding head and welding seat. The inverse piezoelectric effect of the ceramic inside the transducer is used to convert the high-frequency electric energy generated by the high-frequency generator. It vibrates into high frequency, which is amplified and transmitted to the welding head by the horn, and heat is generated through the high frequency friction between the welding head and the welding seat to realize the welding between the welding parts. The weldment does not melt during the working process of the ultrasonic welding machine. It is a clean and efficient welding method, which is widely used in the production an...
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IPC IPC(8): B23K20/10B23K20/26
CPCB23K20/106B23K20/26
Inventor 洪银聪郎根峰翁新全许静玲柯银鸿刘瑞林
Owner XIAMEN NIELL ELECTRONICS