Research Papers

Modeling of Underwater Laser Drilling of Alumina

[+] Author and Article Information
Hong Shen

School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
State Key Laboratory of Mechanical System and
Shanghai, 200240, China
e-mail: sh_0320@sjtu.edu.cn

Decai Feng

School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China

Zhenqiang Yao

School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
State Key Laboratory of Mechanical System
and Vibration,
Shanghai 200240, China

Manuscript received May 12, 2016; final manuscript received September 19, 2016; published online October 19, 2016. Assoc. Editor: Hongqiang Chen.

J. Manuf. Sci. Eng 139(4), 041008 (Oct 19, 2016) (10 pages) Paper No: MANU-16-1275; doi: 10.1115/1.4034893 History: Received May 12, 2016; Revised September 19, 2016

Laser drilling of alumina is a noncontact material processing method, which has great advantages over the traditional mechanical machining. However, the quality of laser drilling is still a challenge. In this study, a 2D transient model is developed to simulate the underwater laser drilling of alumina, considering the recoil pressure which is generated by adjusting the density of water. The distributions of the temperature, pressure, and velocity during the drilling process are examined. The numerical results show that the underwater-drilled hole with smaller taper is obtained compared with that in air, which is attributed to the recoil pressure, higher specific heat capacity, and heat transfer coefficient of water. The experimental results validate the phenomenon in numerical simulation.

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Fig. 1

Schematic view of laser drilling process

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Fig. 2

Underwater laser drilling of alumina

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Fig. 3

Flowchart of computational process

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Fig. 4

Equivalent recoil pressure: (a) calculated recoil pressure and the density of water and (b) recoil pressure resulted from adjusting the water density

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Fig. 5

Configuration of the underwater laser drilling system

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Fig. 6

The distribution of temperature during the underwater drilling (P = 1500 W, τ = 1 ms): (a) t = 0.001 s one pulse, (b) t = 0.05 s, (c) t = 0.101 s two pulses, (d) t = 0.15 s, (e) t = 0.201 s three pulses, and (f) t = 0.301 s four pulses

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Fig. 7

The distributions of pressure and velocity at the third pulse (P = 1500 W, τ = 1 ms): (a) pressure and (b) velocity

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Fig. 8

The comparison of the hole section profiles: (a) underwater and (b) in air

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Fig. 9

The comparison of the distributions of temperature and pressure at the third pulse: (a) temperature: underwater, (b) temperature: in air, (c) molten zone: underwater, (d) molten zone: in air, (e) pressure: underwater, and (f) pressure: in air

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Fig. 10

The comparison of the hole section profiles (P = 1500 W, τ = 1 ms): (a) underwater and (b) in air

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Fig. 11

The diameters of the underwater drilled hole (P = 1500 W, τ = 1 ms): (a) the entrance and (b) the exit

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Fig. 12

Entrance diameter, exit diameter, and hole taper with different pulse widths (10 pulses): (a) underwater and (b) in air

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Fig. 13

Comparison of hole section profiles drilled: (a) in air and (b) underwater



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