Modeling and optimization of longitudinal-torsional vibration horn with the large tool head

Design and Experimental Study of Longitudinal-Torsional Composite Ultrasonic Internal Grinding Horn

“…Relevant studies have shown that, as the spiral angle θ of the spiral groove increases from small to large, i increases first and then decreases, and the torsional-longitudinal ratio i reaches the maximum when the spiral angle θ = 45 • . As the length of the spiral groove L g increases, the torsional-longitudinal ratio i increases [23,38]. Therefore, the number of the spiral grooves is N = 4, the spiral angle θ = 45 • , and the length of the spiral groove L g is as long as possible.…”

“…Considering the actual machining operation and the presence of the tool radius, a safety clearance of 6 mm is reserved and the length of the spiral groove is L g = 50 mm. From the relevant literature [21,23], it is found that the most commonly selected range of spiral groove width is 4-8 mm. And, the depth of the spiral groove also has an effect on the frequency and torsional-longitudinal ratio [21].…”

“…The influence of the structural parameters of the composite horn on the frequency of the consolidation vibration system was analyzed, and the structural parameters of the composite horn were optimized. Li et al [23] designed a longitudinal-torsional ultrasonic horn (HWLTD) with a large tool head, and predicted and optimized the resonant frequency. On this basis, the principle of spiral groove vibration mode conversion was deduced.…”

“…When the traditional method is used to design a horn with larger tool head (such as a large diameter impeller, grinding wheel, etc. ), the ultrasonic vibration energy is transferred to a larger load, which will not only lead to a sharp decline in amplitude, but also lead to a large difference between the resonant frequency of the overall vibration and the design frequency [23]. Therefore, this paper combined both the transfer matrix theory and finite element analysis to model the horn with grinding wheel and carry out the finite element simulation optimization design, which is of great significance for improving the vibration characteristics of the horn and the tool head [24,25].…”

Longitudinal-Twist Wave Converter based on Chiral Metamaterials

“…For instance, the conversion of longitudinal polarization into a hybrid wave representing both longitudinal and twisting modes has been proved by the Origami Kresling converter [35]. Generally, the L-T conversion effect is utilized for a wide range of ultrasonic applications, such as welding and drilling systems [36,37].…”