Numerical simulation of melt ejection during the laser drilling process on metal by millisecond pulsed laser

2013 ◽  
Author(s):  
Yiming Zhang ◽  
Zhonghua Shen ◽  
Xiaowu Ni
Keyword(s):  
Numerical Simulation ◽  
Pulsed Laser ◽  
Laser Drilling ◽  
Drilling Process ◽  
Melt Ejection

Three-dimensional transient numerical simulation of laser drilling process

2012 ◽  
Vol 42 (8) ◽  
pp. 869-876 ◽  
Author(s):  
ZhiFu GE ◽  
ShaoXia LI ◽  
Gang YU ◽  
XiuLi HE ◽  
GuoQuan LU
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Laser Drilling ◽  
Drilling Process ◽  
Transient Numerical Simulation

Transient Elastic and Viscoelastic Thermal Stresses During Laser Drilling of Ceramics

1998 ◽  
Vol 120 (4) ◽  
pp. 892-898 ◽  
Author(s):  
M. F. Modest
Keyword(s):  
Solid Surface ◽  
Thermal Stresses ◽  
Bending Strength ◽  
Pulsed Laser ◽  
Laser Drilling ◽  
Heat Fluxes ◽  
Temperature Fields ◽  
Drilling Process ◽  
Elastic Stresses ◽  
Viscoelastic Effects

Lasers appear to be particularly well suited to drill and shape hard and brittle ceramics, which are almost impossible to netshape to tight tolerances, and are presently machined in industry only by diamond grinding. Unfortunately, the large, focussed heat fluxes that allow the ready melting and ablation of material, also result in large localized thermal stresses within the narrow heat-affected zone, which can lead to microcracks, significant decrease in bending strength, and even catastrophic failure. In order to assess the where, when, and what stresses occur during laser drilling, that are responsible for cracks and decrease in strength, elastic and viscoelastic stress models have been incorporated into our two-dimensional drilling code. The code is able to predict temporal temperature fields as well as the receding solid surface during CW or pulsed laser drilling. Using the resulting drill geometry and temperature fields as well as the receding solid surface during CW of pulsed laser drilling. Using the resulting drill geometry and temperature field, elastic stresses as well as viscoelastic stresses are calculated as they develop and decay during the drilling process. The viscosity of the ceramic is treated as temperature-dependent, limiting viscoelastic effects to a thin layer near the ablation front where the ceramic has softened.

Fabrication of Fine Mesh Filter Screen with Pulsed Laser

2012 ◽  
Vol 516 ◽  
pp. 54-59
Author(s):  
Keiji Ogawa ◽  
Heisaburo Nakagawa ◽  
Fumiya Murase ◽  
Susumu Nishida
Keyword(s):  
Small Diameter ◽  
Pulsed Laser ◽  
Batch Process ◽  
Laser Drilling ◽  
Hole Drilling ◽  
Drilling Process ◽  
Diameter Hole ◽  
Fine Mesh ◽  
Fine Pitch ◽  
Filter Screen

This paper proposes a novel manufacturing process of a fine mesh filter screen with a pulsed laser. The fine mesh filter screen, made of stainless steel, has many small diameter holes with high aspect ratio and fine pitch. In the conventional process, an electron beam drills in a vacuum. However, this is very costly because of the expensive equipment required and batch process. Therefore, a laser drilling process for small diameter hole drilling in air with higher flexibility was proposed. The post-processes after the laser drilling completed the fine mesh filter screen.

Analysis of melt ejection during long pulsed laser drilling

2016 ◽  
Vol 25 (5) ◽  
pp. 054206 ◽  
Author(s):  
Ting-Zhong Zhang ◽  
Zhi-Chao Jia ◽  
Hai-Chao Cui ◽  
De-Hua Zhu ◽  
Xiao-Wu Ni ◽  
...  
Keyword(s):  
Pulsed Laser ◽  
Laser Drilling ◽  
Melt Ejection

scholarly journals Analysis and optimization of laser drilling process during machining of AISI 303 material using grey relational analysis approach

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
V. Chengal Reddy ◽  
Thota Keerthi ◽  
T. Nishkala ◽  
G. Maruthi Prasad Yadav
Keyword(s):  
Surface Roughness ◽  
Process Parameters ◽  
Grey Relational Analysis ◽  
Pulse Frequency ◽  
Laser Drilling ◽  
Simultaneous Optimization ◽  
Fibre Laser ◽  
Drilling Process ◽  
Relational Analysis ◽  
Grey Relational

AbstractSurface roughness and heat-affected zone (HAZ) are the important features which influence the performance of the laser-drilled products. Understanding the influence of laser process parameters on these responses and identifying the cutting conditions for simultaneous optimization of these responses are a primary requirement in order to improve the laser drilling performance. Nevertheless, no such contribution has been made in the literature during laser drilling of AISI 303 material. The aim of the present work is to optimize the surface roughness (Ra) and HAZ in fibre laser drilling of AISI 303 material using Taguchi-based grey relational analysis (GRA). From the GRA methodology, the recommended optimum combination of process parameters is flushing pressure at 30 Pa, laser power at 2000 W and pulse frequency at 1500 Hz for simultaneous optimization of Ra and HAZ, respectively. From analysis of variance, the pulse frequency is identified as the most influenced process parameters on laser drilling process performance.

Numerical simulation of different pulse width of long pulsed laser on aluminum alloy

2015 ◽  
Author(s):  
Mingxin Li ◽  
Guangyong Jin ◽  
Wei Zhang ◽  
Guibo Chen ◽  
Juan Bi
Keyword(s):  
Numerical Simulation ◽  
Aluminum Alloy ◽  
Pulse Width ◽  
Pulsed Laser
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