Ultrasonic mold is one of the most profound aspects of ultrasonic technology. Even with several years of design and development experience, we firmly believe that only through rigorous testing and quality control can produce the best welding head. Our engineers will weld the acoustic characteristics and mechanical characteristics of the perfect combination, design the most in line with customer needs of the product, ultrasonic mold is a key parameter, ultrasonic mold amplitude parameters are also very important in practice!
The amplitude parameter design of the mold: amplitude is a key parameter for the material that needs to be welded, which is equivalent to the temperature of ferrochrome. If the temperature cannot reach it, it will not be fused. If the temperature is too high, the raw material will be scorched or lead to structural damage and the strength will deteriorate. Due to different choice of transducer is different, the amplitude of the transducer output after fit different variable ratio of the amplitude and the welding head, able to work correction of welding head amplitude to conform to the requirements, usually transducer output amplitude for 10-20 microns, and the working amplitude, generally about 30 microns, and the amplitude change of welding head than with the amplitude and the shape of a welding head, In terms of shape, such as exponential amplitude variation, functional amplitude variation, ladder amplitude variation, etc., it has a great influence on the variation ratio, and the area ratio is proportional to the total variation ratio. If different welders are selected, the simplest method is to make the welding head in proportion to the size of the working, which can ensure the stability of the amplitude parameters.
Frequency parameter design: Ultrasonic welding machines all have a central frequency, such as 20KHz, 40khz, etc. The working frequency of the welding machine is mainly determined by the mechanical resonance frequency of the Transducer, Booster and Horn. The frequency of the Ultrasonic generator is adjusted according to the mechanical resonance frequency to achieve consistency. The welding head works in resonant state, and each part is designed as a half wavelength resonant body. Both generator and mechanical resonance frequency have a resonant working range, such as generally set to ± 0.5khz, within this range welding machine can basically work normally. When making each welding head, the resonant frequency will be adjusted to ensure that the error between the resonant frequency and the design frequency is less than 0.1khz, such as 20KHz welding head, the frequency of the welding head will be controlled at 19.90-20.10khz, the tolerance is 5％.
Mould vibration node design: the ultrasonic welding head and the horn are designed as a half-wavelength resonant body with a working frequency. In the working state, the amplitude of the two end faces is maximum and the stress is minimum, while the amplitude of the node corresponding to the middle position is zero and the stress is maximum. General design for fixed node position, but usually the fixed position of the design thickness is greater than 3 mm, or groove is fixed, so the fixed position is not must be zero amplitude, this will lead to some calls, and part of the energy loss, for sound usually with a rubber ring with the other parts, or with sound insulation materials for shielding, energy loss is taken into account in the design of die amplitude parameters.
Mould machining precision design: ultrasonic welding head for work in the high frequency vibration circumstances, should try to keep a symmetrical design, in order to avoid acoustic transfer caused by the asymmetry of unbalanced stress and transverse vibration (welding head is used for welding by using the ultrasonic vibration of vertical transmission, for the resonant system), the unbalanced vibration can cause welding hot hair and fracture. Ultrasonic welding is applied in different industries is different to machining precision requirement, for special thin artifacts such as lithium ion battery pole piece and an ear of welding, such as the gold foil covering the requirement of machining accuracy is very high, all of the processing equipment adopt numerical control equipment (such as machining center, etc.), so as to guarantee the machining precision meets the requirements.
Post time: Mar-02-2022