Reducing surface roughening in microscale laser dynamic flexible bulging by using laser pre-shocking

Shen, Zongbao; Zhang, Lei; Zhang, Jindian; Пин, Ли; Zhen, Xijin; Liu, Huixia; Wang, Xiao

doi:10.1016/j.jmapro.2021.10.030

Cited by 2 publications

(1 citation statement)

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“…This is because laser shock plays a positive role in improving the surface roughness and refining the internal grains of the workpiece [ 20 , 21 ]. In our previous work, Zhang et al investigated the grain size effect in micro-punching [ 22 ] and micro-bulging processes [ 23 ], and found that laser pre-shocking (LPS) effectively improved the forming quality of micro-parts. However, the existence of the mold size effect restricts the development of microscale laser dynamic flexible bulging (μLDFB).…”

Section: Introductionmentioning

confidence: 99%

Mold Size Effect in Microscale Laser Dynamic Flexible Bulging Assisted by Laser Pre-Shocking

et al. 2022

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The size effect seriously affects the forming quality of micro-formed parts in the field of micro-forming. This paper focuses on the influence of the mold size effect in microscale laser dynamic flexible bulging (μLDFB). The experimental results indicate that, for the copper foil with a given thickness, there are suitable mold characteristic sizes to obtain better forming quality. The surface quality of bulging parts is poor when the mold characteristic size is small. However, the forming symmetry and forming uniformity of bulging samples are reduced when the mold characteristic size is large. As the laser pulse energy increases, the plastic strain increases, and the bulging samples experience five stages: uniform plastic deformation, local necking, cracks in the bulging zone, complete fracture in the bulging zone and complete rupture at the mold entrance zone. The increase of the surface roughening rate caused by the increase of grain size and mold characteristic size makes local necking easier, which further leads to fracture. On this basis, in this paper laser pre-shocking (LPS) is introduced to improve the forming quality. Comparative experiments show that LPS has a positive effect on improving the surface quality and the forming performance of bulging samples. The forming limit of bulging samples is increased and the occurrence of local necking is delayed.

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