超声振动对渐进成形件表面性能的影响

Influence of ultrasonic vibration on surface properties for incremental forming parts

为了探究超声振动对渐进成形件的表面性能及表面形貌的影响,选取步距和超声振动作为实验变量,综合分析了超声振动对成形件表面形貌(波纹、凹坑和表面粗糙度)和表面性能(硬度和接触角)的影响。结果表明,超声振动使成形件的表面波纹高度降低,使凹坑深度发生变化。施加超声振动后,成形件的表面粗糙度明显下降,且随着步距的增加而减小,成形件表面出现规律性凹坑。与原始板材相比,渐进成形件的硬度大幅提升,但是施加超声振动的成形件的表面硬度小于传统成形件,且硬度随着步距的增加而增大。施加超声振动后,接触角可达112°,表现为疏水性。

In order to explore the influence of ultrasonic vibration on surface properties and surface morphology of incremental formed part, the step size and ultrasonic vibration were selected as the experimental variables, and the influences of ultrasonic vibration on the surface morphology(waviness, pit and surface roughness) and the surface properties(hardness and contact angle) of the formed parts were comprehensively analyzed. The results show that the ultrasonic vibration reduces the surface waviness height and changes the pit depth of formed part. After applying ultrasonic vibration, the surface roughness of the formed parts decreases obviously, it decreases with the increasing of step size, and the regular pits were observed on the surface of the formed parts. Compared with the original sheet, the hardness of the incremental formed part is significantly increased, but the surface hardness of the formed part applied with ultrasonic vibration is lower than that of the traditional formed part. Meanwhile, the hardness is increased with the increasing of the step size. After applying ultrasonic vibration, the contact angle can reach 112°, showing hydrophobicity.