Polishing Mechanism of Non-straight Holes in Additive Manufacturing by Volume Alternating Cavitation Effect

XU Jiangqi; LI Fuzhu; WANG Yun; HU Longfei; LU Ziang; ZHANG Haijun; GUO Yuqin

doi:10.3969/j.issn.1674-6457.2025.09.013

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (9) : 136-144. DOI: 10.3969/j.issn.1674-6457.2025.09.013

Additive Manufacturing

Polishing Mechanism of Non-straight Holes in Additive Manufacturing by Volume Alternating Cavitation Effect

XU Jiangqi, LI Fuzhu, WANG Yun, HU Longfei, LU Ziang, ZHANG Haijun, GUO Yuqin

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Abstract

The work aims to solve the problem of non-uniform polishing of the inner surface of non-straight holes made by additive with large aspect ratio and realize uniform polishing of non-straight holes in additive manufacturing. A Fluent two-dimensional transient simulation model was established and the characteristics of the cavitation flow field in non-straight holes were analyzed through bidirectional volume alternating cavitation numerical simulation. The effect of different parameters on it was explored. The bidirectional volume alternating cavitation experimental device was used to verify the inner surface polishing experiment of non-straight holes in R4600 resin material, and a Rtec UP-3000 3D profilometer was used to measure the internal surface roughness of different samples. The void fraction and turbulence intensity in the flow field showed periodic changes. Moreover, as the frequency and stroke increased, the cavitation effect within the flow field got intensified. With the increase of frequency, stroke and time, the roughness Ra of the inner surface of the non-straight hole showed a trend of first decreasing and then increasing. When time t=3 h, frequency f=20 Hz, and stroke H=20 mm, the surface roughness inside the holes decreased by a maximum of 50.09%. However, cavitation pits also began to appear, causing the Ra value to increase. In conclusion, the bidirectional volume alternating cavitation method has a significant effect on polishing non-straight holes in additive manufacturing, and process parameters directly affect the polishing quality.

Key words

bidirectional volume alternation / cavitation / additive manufacturing / non-straight holes / polishing

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XU Jiangqi, LI Fuzhu, WANG Yun, HU Longfei, LU Ziang, ZHANG Haijun, GUO Yuqin. Polishing Mechanism of Non-straight Holes in Additive Manufacturing by Volume Alternating Cavitation Effect[J]. Journal of Netshape Forming Engineering. 2025, 17(9): 136-144 https://doi.org/10.3969/j.issn.1674-6457.2025.09.013

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