Shaping Materials with Lasers

“…Laser from Carbon/Teflon and Glass/Teflon materials [16] can produce threaded and turned workpiece. A single beam technique for creating three-dimensional contours was presented using a 450 W CW CO 2 laser to machine overlapping grooves on a ceramic workpiece [17]. Silicon carbide, silicon nitride, alumina, and SiAlON were tested.…”

Section: Three-dimensional Machiningmentioning

confidence: 99%

Laser Machining and its Associated Effects

Pan

Hocheng

2012

Advanced Analysis of Nontraditional Machining

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Laser machining has a wide range of industrial applications. However, laser energy can cause thermal damage to composite materials during the shaping operation following curing. Such damage leads to poor assembly tolerances and reduces long-term performance. In this study, we investigated the laser machininginduced formation of anisotropic heat-affected zones (HAZs) in fiber-reinforced plastics (FRP). The degree of HAZ is estimated by the isotherm of the matrix char temperature. Analysis revealed that both the laser energy per unit length and the fiber orientation-dependent thermal conductivity are key factors in determining the extent of HAZ. An experimental measurement of anisotropic thermal conductivity for composite materials is developed. Heat conduction is greater along fibers than it is across a fiber section, thus laser scanning direction relative to fiber orientation affects the HAZ geometry. The study also investigated the principalaxis and nonprincipal-axis grooving of unidirectional (UD), [0/90], Mat, and MatUD laminates. An analytical model based on a moving point heat source using the Mirror Image Method and immersed heat source to model principalaxis grooving is adopted to correlate HAZ anisotropy with various process parameters. Finite difference method (FDM) with an isotherm conductivity model and eigenvalue method is applied to simulate the HAZ resulting from nonprincipalaxis grooving.

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“…Another effect associated with the laser heating of workpiece ahead of the cutting tool is the heating of the shear plane as the chip is formed. Such heating of the shear plane may result in advantages such as decreased cutting forces, increased material removal rate, increased tool life, and improved surface conditions expressed in terms of surface roughness, residual stresses, and flaw distributions (Copley et al 1983). In the context of machining of ceramic materials, the cost reductions in the range 60-80% are expected with LAM (Chrysolouris et al 1997).…”

Section: Lam Processmentioning

confidence: 99%

“…Figure 6.33b shows such laser turned threads in Si 3 N 4 ceramic (Liu et al 1999). In addition to the turning of screw threads, laser machining has been demonstrated for producing "O" ring grooves in alumina ceramic (Copley et al 1983, Copley 1987. Figure 6.34 presents a pattern machined in silicon carbide ceramic using pulsed Nd:YAG laser.…”

Section: Applications Of Three-dimensional Laser Machiningmentioning

confidence: 99%

Laser Fabrication and Machining of Materials

2008

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except for brief excerpts in connection with reviews or scholarly analysis. Use in connection with any form of information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now know or hereafter developed is forbidden. The use in this publication of trade names, trademarks, service marks and similar terms, even if they are not identifi ed as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights.Printed on acid-free paper. 9 8 7 6 5 4 3 2 1 springer.com v medicine, it is rapidly making headways in the field of biomedicine. As mentioned earlier, Part I provides sufficient basics of lasers and laser processes to spawn thoughts in one's mind for new applications of lasers. Examples of such new applications are described in chapters on laser interference processing, laser shock processing, and laser dressing of grinding wheels. It is hoped that the book will provide further impetus to many more readers to take lasers into new frontiers of applications.Thus, unlike many other books on similar topics, this book deals with the subject of laser-based fabrication and machining in a comprehensive manner. The subject matter in the proposed book extends over a wide range of disciplines that include, but are not limited to, mechanical, electrical/electronics, materials, and manufacturing. Such interdisciplinary discussion of the topic is a need of the time for many undergraduate and graduate academic programs and research activities that themselves are increasingly wielding interdisciplinary flavor. Furthermore, the scope of the subject matter ranging over macro-, to micro-, to nanolevels of processing/ manufacturing is very important to educate and prepare individuals for the next generation manufacturing. In addition, the integration of fundamental principles and physical phenomena governing laser-based fabrication/machining processes and their existing and potential applications have widened the scope of the book across the sectors of academia, research, and industry.

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Shaping Materials with Lasers

Cited by 25 publications

References 0 publications

Laser machining of structural ceramics—A review

Laser machining of structural ceramics—A review

Laser Machining and its Associated Effects

Laser Fabrication and Machining of Materials

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