Topic
Laser cutting
About: Laser cutting is a research topic. Over the lifetime, 10711 publications have been published within this topic receiving 67663 citations.
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TL;DR: The experimental and theoretical studies of LBM show that process performance can be improved considerably by proper selection of laser parameters, material parameters and operating parameters, and the trend for future research is outlined.
Abstract: Laser beam machining (LBM) is one of the most widely used thermal energy based non-contact type advance machining process which can be applied for almost whole range of materials. Laser beam is focussed for melting and vaporizing the unwanted material from the parent material. It is suitable for geometrically complex profile cutting and making miniature holes in sheetmetal. Among various type of lasers used for machining in industries, CO2 and Nd:YAG lasers are most established. In recent years, researchers have explored a number of ways to improve the LBM process performance by analysing the different factors that affect the quality characteristics. The experimental and theoretical studies show that process performance can be improved considerably by proper selection of laser parameters, material parameters and operating parameters. This paper reviews the research work carried out so far in the area of LBM of different materials and shapes. It reports about the experimental and theoretical studies of LBM to improve the process performance. Several modelling and optimization techniques for the determination of optimum laser beam cutting condition have been critically examined. The last part of this paper discusses the LBM developments and outlines the trend for future research.
754 citations
TL;DR: In this paper, the 3D theory of laser cutting is presented and the cutting efficiency determined by its ultimate parameters at different types of polarization is estimated, and the physical reasons for limitations of ultimate cutting parameters at a plane P-polarized beam are displayed.
Abstract: The three-dimensional (3D) theory of laser cutting is presented. The cutting efficiency determined by its ultimate parameters at different types of polarization is estimated. The physical reasons for limitations of ultimate cutting parameters at a plane P-polarized beam are displayed. In the case of cutting metals with a large ratio of sheet thickness to width of the cut, the laser cutting efficiency for a radially polarized beam is 1.5 - 2 times larger than for plane P-polarized and circularly polarized beams. The possibility of generating the radially polarized beam is discussed.
583 citations
Patent•
28 Nov 1995
TL;DR: An improved expandable stent for implantation in a body lumen, such as an artery, and an improved method for making it from a single length of tubing are presented in this article.
Abstract: An improved expandable stent for implantation in a body lumen, such as an artery, and an improved method for making it from a single length of tubing. The stent consists of a plurality of radially expandable cut cylindrical elements generally aligned on a common axis and interconnected by one or more interconnective elements, the elements having a rectangular cross-section from cut-to-cut. The individual radially expandable cylindrical elements are disposed in an undulating pattern. The stent is manufactured by direct laser cutting from a single metal tube using a finely focused laser beam passing through a coaxial gas jet structure to impinge on the working surface of the tube as the linear and rotary velocity of the tube is precisely controlled.
519 citations
TL;DR: A theoretical analysis of the energy balance in the laser - metal interaction zone is carried out in this article, where heat transfer due to the recoil-pressure-induced melt flow is taken into consideration.
Abstract: A theoretical analysis of the energy balance in the laser - metal interaction zone is carried out. The heat transfer due to the recoil-pressure-induced melt flow is taken into consideration. It is shown that, for the absorbed laser intensities typical in welding and cutting, the recoil pressure induces high-velocity melt-flow ejection from the interaction zone. This melt flow carries away from the interaction zone a significant portion of the absorbed laser intensity (about 70 - 90% at low laser intensities); thus, convection-related terms can be ignored neither in calculations of the energy balance in the interaction zone nor in calculations of the thermal field in the vicinity of the weld pool or cutting front.
492 citations
TL;DR: In this paper, the major parameters determining the cutting result, especially with respect to the quality, are discussed and explained, as far as possible, as well as the tool geometry and cutting conditions are discussed.
Abstract: The machining of Fibre Reinforced Plastics (FRP) differs in many respects from metal working. The common machining tasks mostly require contouring operations for 3-dimensional, spatially curved structures. The material behaviour not only is inhomogeneous, but also dependent on fibre and matrix properties, fibre orientation and the type of weave. Mechanical techniques like drilling and routing perform well, if carbide or PCD cutters with keen cutting edges are used. Tool geometries as well as cutting conditions are discussed in the paper. Water jet cutting is found to be well suited for thin laminates, but requires a careful adjustment of the cutting parameters in order to avoid delamination and chipping at the jet exit side. Therefore, the quality of the cut is highly dependent on material composition and fibre orientation. Thermal damage, which is the major problem in laser cutting is to a high degree influenced by the thermal properties of the material, power density, feed rate, and gas flow. In this paper the major parameters determining the cutting result, especially with respect to the quality, are discussed and explained, as far as possible.
425 citations