scholarly journals Application of high speed filming techniques to the study of rearwards melt ejection in laser drilling

2017 ◽  
Vol 29 (2) ◽  
pp. 022204 ◽  
Author(s):  
Connor Jones ◽  
D. B. Hann ◽  
K. T. Voisey ◽  
Scott Aitken
Keyword(s):  
High Speed ◽  
Laser Drilling ◽  
Melt Ejection

High speed videography of microvia formation and melt ejection

2002 ◽  
Author(s):  
Francisco Villarreal ◽  
Kiran Gulia ◽  
Howard J. Baker ◽  
Duncan P. Hand ◽  
Denis R. Hall
Keyword(s):  
High Speed ◽  
Melt Ejection

A general high-speed laser drilling method for nonmetal thin material

2013 ◽  
Author(s):  
Zhijian Cai ◽  
Guangsheng Xu ◽  
Zhou Xu ◽  
Zhiqiang Xu
Keyword(s):  
High Speed ◽  
Laser Drilling ◽  
Drilling Method

Cu-Direct Laser Drilling of Blind Via-Hole in Multi-Layer PWBs: Process Visualization Using High-Speed Camera Images

2012 ◽  
Vol 516 ◽  
pp. 30-35 ◽  
Author(s):  
Kuniyoshi Obata ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
Keiji Ogawa
Keyword(s):  
High Speed ◽  
Substrate Surface ◽  
Laser Drilling ◽  
Drilling Process ◽  
Positional Accuracy ◽  
Board Density ◽  
Process Visualization ◽  
Direct Laser ◽  
Via Holes ◽  
Direct Drilling

Electrical circuits of Printed Wiring Boards (PWBs) have become multi-layered. Therefore, the formation of micro-blind holes for interlayer electrical connections (blind via holes: BVH) is required. As a result, Cu-direct laser drilling is attracting attention. However, Cu-direct drilling is problematic in that it produces a copper overhang as a result of copper and resin, which have different decomposition points, being melted simultaneously. In addition, the state of PWB surface after the laser drilling is very important. However, this procedure restricts the board density that can be achieved as a result of the limited positional accuracy of the etching process. Consequently, using a Cu-direct drilling process, which does not require etching of the copper foil, to drill BVHs to connect copper foils using a CO2 laser beam has been receiving considerable attention for the next-generation high density PWB manufacturing. However, in the Cu process of generating a direct and overhang problem, there is the problem of accuracy on the substrate surface. In contrast, in-depth research on quality companies has not been performed. Thus, we observe the removal process. Furthermore, we demonstrated reduced overhang.

Modeling and Characterization of Laser Drilling of Small Holes on Metal Sheets

2004 ◽  
Author(s):  
Wei Han ◽  
Ryszard J. Pryputniewicz
Keyword(s):  
Laser Beam ◽  
Manufacturing Industry ◽  
Pulse Length ◽  
Experimental Studies ◽  
Laser Drilling ◽  
Melting Front ◽  
Laser Parameters ◽  
Metal Sheets ◽  
Small Holes ◽  
Melt Ejection

Laser drilling is increasingly being used in fabrication of small components in various materials with applications in aerospace, automotive, electronics and medical industries, and it offers a unique combination of benefits for the contemporary manufacturing industry as a rapid, precise, clean, flexible, and efficient process. Laser drilling involves a stationary laser beam which uses its high power density to melt or vaporize material from the workpiece, and the process is governed by an energy balance between the irradiating energy from the laser beam, the conduction heat into the workpiece, the energy losses to the environment, and the energy required for phase change in the workpiece. There are three major mechanisms of removal of material from the beam interaction zone and consequent propagation of the melt front into the metal bulk. They are (1) melt ejection due to interaction between the melt and an assisting gas, (2) melt ejection by the vaporization-induced recoil force, and (3) melt evaporation. The results of laser drilling processes, such as the profile of the heat affected zone (HAZ) and the geometry of the holes, strongly depend on settings of the laser parameters such as peak power, pulse length, pulse repetition rate, number of pulses, focal condition, etc. In addition, the processing results are strongly influenced by geometrical and material properties of the workpiece. This paper presents theoretical and experimental studies of laser drilling of micrometer size holes on metal sheets using a pulsed Nd:YAG laser. A model of the temperature distribution and the motion of the melting front for laser drilling is presented and compared with experimental data. Effects of laser parameters on the resultant geometry of the hole are investigated and summarized, and an optimum procedure for laser drilling of small holes on metal sheets is outlined.

scholarly journals High Speed EDM and Laser Drilling of Aerospace Alloys

Procedia CIRP ◽  
2016 ◽  
Vol 42 ◽  
pp. 526-531 ◽  
Author(s):  
Mohammad Antar ◽  
Dimitrios Chantzis ◽  
Sundar Marimuthu ◽  
Philip Hayward
Keyword(s):  
High Speed ◽  
Laser Drilling ◽  
Aerospace Alloys
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