Improving the Forming Quality of Laser Dynamic Flexible Micropunching by Laser Pre-Shocking

Zhang, Jindian; Shen, Zongbao; Lin, Youyu; Li, Kai; Zhou, Guoyang; Wang, Yan; Zhang, Lei; Пин, Ли; Liu, Huixia; Wang, Xiao

doi:10.3390/ma13173667

Cited by 3 publications

(1 citation statement)

References 37 publications

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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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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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Study on the forming of complex shaped microparts by progressive micropunching of thin copper strip

Guo,

Ma,

Zhang

et al. 2024

Journal of Materials Research and Technology

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Experimental and numerical study on fragmentation mechanism of copper sheet in laser dynamic forming

Chen

Пин

Zhen

et al. 2021

Mater. Res. Express

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The fragmentation mechanism of copper sheet in laser dynamic forming (LDF) process is investigated. The investigation of the fragmentation mechanism in the moving sample is quite difficult, so finite element method is adopted to provide detailed information on the stress state during micro-forming. The shock loading was generated using laser-shock-rubber loading technique in which a layer of rubber is inserted to improve laser shock efficiency. When laser power density is 0.491 GW cm−2, the obvious circular fragmentation is located at the center region of rear surface. When laser power density is 0.658 GW cm−2, the diameter of the fragmentation region increased, and what’s more, circumferential and radial cracks were formed in the fragmentation region. The void linkages and terrace-like pattern were also observed. Finite element model reveals that the fragmentation in the moving sheet is not caused by the initial rubber direct loading, but the deceleration at the last stage of forming. Because the curvature in the tip has the highest value at the stopping point, deceleration passes through its maximum value and then causes fragmentation at the last stage of forming. When laser power density is 0.658 GW cm−2, the single layer fragmentation, multiple layer fragmentation, circumferential crack, and radial cracks occur in that sequence.

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Improving the Forming Quality of Laser Dynamic Flexible Micropunching by Laser Pre-Shocking

Cited by 3 publications

References 37 publications

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

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

Study on the forming of complex shaped microparts by progressive micropunching of thin copper strip

Experimental and numerical study on fragmentation mechanism of copper sheet in laser dynamic forming

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