超声振动对W形金属密封环滚压成形不均匀变形的影响

Effect of ultrasonic vibration on uneven deformation of large diameter thin-walled superalloy W-ring during rolling forming

摘要:

为了提高W形金属密封环的成形质量，本文对W形金属密封环的超声振动滚压成形过程进行了研究。基于ABAQUS/Explicit有限元仿真软件，搭建了W形金属密封环超声振动辅助滚压成形三维有限元模型，研究了超声频率对环件不均匀变形的影响。结果表明：随着超声频率的增加，环件的应力不均匀度呈现先增后减的规律；环件的应变不均匀度呈现先略微减小，然后激增，再减小的规律；壁厚不均匀度呈现先减小，后增大，再减小的趋势。其中在超声频率为30kHz与40kHz时环件变形不均匀程度显著增大，这是由于环件产生了起皱现象造成的；通过对截面的应力、应变和壁厚不均匀分析，证明了波峰与波谷位置是成形过程中的关键部位。

Abstract:

In order to improve the forming quality of W-ring, the ultrasonic vibration rolling process of W-ring was studied in this paper. Based on ABAQUS/Explicit finite element simulation software, a three-dimensional finite element model of W-ring with ultrasonic vibration assisted rolling was established, and the influence of ultrasonic frequency on the non-uniform deformation of the ring was studied. The results show that with the increase of ultrasonic frequency, the stress unevenness of the ring increases first and then decreases. The strain unevenness of the ring component decreases slightly first, then increases sharply, and then decreases again. The non-uniformity of wall thickness decreases first, then increases and then decreases. When the ultrasonic frequency is 30kHz and 40kHz, the unevenness of the ring deformation increases significantly, which is caused by the wrinkle phenomenon of the ring. By analyzing the stress, strain and wall thickness of the section, it is proved that the position of wave crest and trough is the key position in the forming process.