Accurate temperature characterization and experimental verification in the PCB drilling process

Shi, Huaizhong; Chen, Zhuangpei; Lin, Xiaoke; Zhu, Tao

doi:10.1007/s00170-022-08808-x

Cited by 5 publications

(1 citation statement)

References 9 publications

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“…Liu XH [9] demonstrated that using thinner copper plating could prevent micro-holes plugging, but this method was not suitable for widespread application as the thickness of copper plating was determined according to the requirements of signal transmission. As for the assisted processing method, PCB micro-hole drilling was usually at a higher temperature [17], resin chips tended to melt and sticked to the tool, which hindered drilling process. Thus, a cold air auxiliary drilling technology was put forward by Lin D [18].…”

Section: Introductionmentioning

confidence: 99%

Chip removal mechanism and hole plugging in back-drilling of high-speed printed circuit board

Chen,

Shi,

Zhu

et al. 2024

Preprint

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Micro-holes are channels for signal connection between layers of printed circuit boards (PCBs), and excess invalid hole copper in through holes can destroy the integrity of signal, which is usually removed by back-drilling. However, as high-speed PCBs evolve towards miniaturization and high density, it is difficult to remove chips during back-drilling and easily cause micro-holes plugging, seriously affecting the performance of high-speed PCBs and even leading to scrap. Therefore, the chip removal mechanism of high-speed PCB back-drilling is studied to solve hole plugging in this paper. Firstly, kinematics method is used to analyze the mechanical behavior and motion law of chip formation, and then the expressions of chip removal force and chip moving speed are proposed. Secondly, the chip removal model of backdrilling is established, an evaluation index of chip removal capability is put forward, and the influence rule of machining parameters on chip removal of back-drilling is analyzed afterwards. Finally, back-drilling experiments of high-speed PCB are carried out to observe the chips winding around drill bit and calculated the hole plugging rate of back-drilling. The experimental result demonstrates that the number and density of winding chips in the drill bit slightly decrease with the increase of feed rate, and the hole plugging rate rises almost proportionally. Increasing the spindle speed can greatly improve the chip winding of tools and hole plugging, and effectively reduce the chip removal force of back-drilling. The research presented provides theoretical guidance for solving the bottleneck problem of micro-holes plugging during backdrilling in the high-speed PCB industry.

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Section: Introductionmentioning

confidence: 99%