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2013 | Book

Introduction Read chapter Read first chapter

Laser Drilling

Practical Applications

Author: Bekir Sami Yilbas

Publisher: Springer Berlin Heidelberg

Book Series : SpringerBriefs in Applied Sciences and Technology

Part of: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik"

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About this book

This book introduces laser drilling processes including modelling, quality assessment of drilled holes, and laser drilling applications. It provides insights into the laser drilling process and relation among the drilling parameters pertinent to improved end product quality. This book is written for engineers and scientists working on laser machining, particularly laser drilling.

Table of Contents

Frontmatter
Chapter 1. Introduction
Abstract
Lasers can be considered non-conventional machine tools and find applications in industry because of their precision of operation, low cost, localized processing, and high speed of operation. In laser drilling applications, a focused laser beam is used as heat source increasing temperature rapidly to the melting and evaporation temperature of the substrate material. Since the arrangements of the optical setting for the laser beam is very precise, the localized heating can be controlled easily and desired hole features can be accomplished with maximum accuracy and minimum defects.
Bekir Sami Yilbas
Chapter 2. Thermal Analysis of Laser Drilling Process
Abstract
In laser drilling process, the material removal involves with evaporation at the surface, liquid ejection, and solid heating. However, liquid ejection vanishes for the lasers with the pulse length within the rage and higher than the nanoseconds. However, in drilling applications mass removal by liquid ejection is desirable because the rate of material removed becomes high. Analytical modeling the laser heating process in relation to drilling is difficult, since process involves with the phase change and fluid flow due to the evaporation at the surface. However, numerical modeling is feasible with some useful assumptions.
Bekir Sami Yilbas
Chapter 3. Quality Assessment of Drilled Holes
Abstract
Inconel alloys are widely used in gas power industry as materials for hot gas path components. In order to achieve a long life operation of hot gas parts, substantial cooling of the parts is essential in gas turbine engines. One of the mechanisms to make the passages for coolants in hot path components is the drilling through holes in the parts by a laser beam. In order to improve the practical laser hole drilling, an understanding of the physical process involved in drilling is essential. Considerable research studies were carried out to investigate the laser hole drilling.
Bekir Sami Yilbas
Chapter 4. Laser Drilling and Plasma Formation at the Surface
Abstract
In laser drilling process, plasma, consisting of charged ions, electrons, and neutral atoms is formed above the surface. Drilling process is effect by the size and transient nature of the surface plasma, since the plasma partially absorbs the incident radiation and acts like a heat source contributing to the drilling process. However, formation of the excess plasma modifies the hole geometry at inlet and lowers the drilled hole quality. In order to reduce the difficulty of a theoretical investigation of laser beam plasma interactions a framework is described which resolves the interaction into zones, each of which may be considered separately.
Bekir Sami Yilbas
Chapter 5. Concluding Remarks
Abstract
Laser drilling involves with multiphysics phenomena, which require careful examination of each physical process for improved end product quality. The laser workpiece interaction is governed by solid heating, phase change and plasma formation at the surface. Since the physical processes are complicated, the closed form solutions incorporating the analytical methods do not provide the accurate results.
Bekir Sami Yilbas
Metadata
Title
Laser Drilling
Author
Bekir Sami Yilbas
Copyright Year
2013
Publisher
Springer Berlin Heidelberg
Electronic ISBN
978-3-642-34982-9
Print ISBN
978-3-642-34981-2
DOI
https://doi.org/10.1007/978-3-642-34982-9

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