Papers by Keyword: Laser Cutting

Abstract: This study investigates the possibility of designing and creating dynamic facades of buildings located in aggressive climatic environments (temperatures, air currents, brightness etc.). The study is based on EN AW-5754 samples manufactured by U bending, representing the modules for dynamic facades. The bending process uses a 300 kN Abkant type press. ​ It is performed along two curved lines. The punch and the related mold are printed from ABS with FDM (fused deposited material) technology. Bending is facilitated by customized slots in 4 laser-cut patterns placed along the bending lines. The paper aims to analyze the influence of the slot patterns on the U-bending process, respectively the design of the mold and the punch designed and executed by 3D printing technology.

Abstract: A study on the dimensional tolerance for CO₂ laser wood cutting is focused on the Meranti (Shorea) wood with the thickness of 19 mm. The results on kerf width for two surfaces which are top surface (K_t) and bottom surface (K_b) are investigated. It is interested to find out the optimum cutting parameters to achieve the smallest variance on top and bottom kerf to improve dimensional quality. Laser power, cutting speed, and gas pressure had been selected as investigate parameters and the cut kerf had been analysed. The investigations revealed that laser power and cutting speed are the significant parameters not only in producing a good surface finish, but also in yielding much narrower kerf with to ensure there will be no dimensional errors of the shore wood products. Besides quality, the laser processing approach has overcome most of the challenges faced by conventional production method.

Abstract: The purpose of this chapter of the book is to present knowledge on the use of laser technology in silicon photovoltaic cell manufacturing processes. Particular consideration was given to the technique of using a disk laser to cut the edges of silicon wafers together with the recognition of the flow of laser micromachining on the quality of cut edges to obtain their minimal deformation. The second topic described is the method of producing point contacts employing laser radiation between a layer of vaporised aluminium and crystalline silicon using the Nd:YAG laser. The results illustrating the impact of the structure and parameters of point contact for a given laser radiation energy on basic electrical parameters for complete, prototype solar cells are included. The chapter in the book provides an overview of the literature on the above topics and presents selected results of experimental works carried out by the authors. The motive for its publication is the need to present selected results of own research carried out in the Welding Department cooperating for many years with the Institute of Engineering and Biomedical Materials (IMIiB) of the Silesian University of Technology and the Institute of Metallurgy and Materials Engineering (IMIM) of the Polish Academy of Sciences in Cracow.

Abstract: New technologies known as unconventional technologies make it possible to cut complex shapes at high speed and with relatively high precision. In many cases, especially in the case of thin sheet, created parts produced do not require any further treatment by post-machining. Knowledge of the accompanying phenomena, such as the heat-affected zone (HAZ) or the surface quality of the cutting edge, is necessary, for example, to assess further machining of material in these areas (e.g. drilling and reaming holes or finishing operations on the cutting edge). In this study, the thermal effect of four unconventional cutting technologies – laser, plasma, wire electrical discharge machining (wire EDM) and waterjet cutting on the cut surface of steel sheets is investigated. Steel 1.7102 (DIN 54SiCr6) was chosen for purpose of this study. The width of the HAZ and the nanohardness beneath the cut surface were analyzed.

Abstract: The process of laser cutting by (Nozzle C 20E) can detect the roughness of the surface from the upper side, while laser cutting by (Nozzle C30E) have less roughness detection according to the ability of constant speed with different metal thickness. The width of the Kerf and surface roughness are the most factors which needs for focusing during cutting process for various plate cutting operation by CNC machine. Such machines require oxygen and propane or acetylene gases with proper pressure controls. For the gas cutting machine, the volume of oxygen gas used is more than that of propane gas. The oxygen gas is used for heating and cutting the plates. It is necessary to supply the proper amount and quality of gas to the machine to obtain a good cutting quality surfces. However; the pressure of oxygen gas depends upon the thickness of cutting plates. Stainless steel is the most important metals in the industrial and manufacturing process, so the cutting conditions are very important. Its concluded from our result, that the characteristics of the main selecting factors which effects the laser machine performance such as, the focal lens nozzle height (0.6 to 1.0mm) and the ability and speed of cutting should be fixed and not changing.

Abstract: An experimental study of the effect of the content of the oxygen in the auxiliary process gas on the laser cutting speed and the quality of the cut-off zone surface was made. For the research, the auxiliary technological gases of the brand LAZAL, produced by Air Liquide (99.95% oxygen content) and Energo grade (99.7% oxygen content), were used. For the experiments, a low-carbon steel with a thickness of 8 mm and 3 mm was used. The main objective of the study was to increase the productivity of laser equipment by increasing the cutting speed. It is established that the use of oxygen in laser cutting as an auxiliary gas makes it possible to increase the cutting speed, to decrease the power of the laser installation, or to increase the thickness of the cut metal at the same power.

Abstract: Laser technologies are considered to be unconventional technologies. Laser cutting is one of the most popular industrial operations that use a laser beam. Fibre lasers are most commonly used for cutting metallic materials. The aim of this paper is to experimentally demonstrate a procedure for determining the focal length of a laser beam from the output of the cutting head of a JK400FL fibre laser. Along with other factors, the correct position of the focal point of a laser beam cutting materials, plays a vital role in the quality of the cut and also in determining the cutting speed. It is possible to use a higher cutting speed of the laser machine, without compromising the quality of the cut.

Abstract: During of aluminum alloy materials, it is possible to find three surface types which can be distinguish as primary, secondary and tertiary sections. In practice this is a big problem in case of finding the basic parameters of roughness and waviness as described by ISO 4288. According to our research, it is possible to use optical microscopy in the first step and subsequently to scan the surface in 3D in order to distinguish the type of. Another problem is how to determine the boundaries between the individual structures. The article describes methods to distinguish the boundaries in a more precise way by the cumulative functions, leading to more accurate determination of the surface quality parameters.

Abstract: The paper deals with numerical simulation and its verification when designing production the gutter corner for the rainwater systems. The deep drawing process has been simulated in Pam Stamp 2G software by ESI Group and the part and blank geometry, friction and process parameters have been optimized. Then, those parameters and the die geometry were verified by experiment when lamination tooling concept has been adapted. The metal laminated tooling technology was used for production of the punch by applying the laser cutting, assembling and joining. The experiments were done using hot deep galvanized steel sheet DX54D+Z with thickness 0.6 mm.

Abstract: Laser cutting is a process used as an alternative of conventional machinery that works by directing the output of the laser power on the would be-cut material. Material exposed to the laser light is then melted, burned, and evaporated by the gas. Thus, this laser cutting process produces high-quality edge surface. The research aimed to determine the effects of the laser head distance and cutting speed to obtain minimum width of gap and the laser cutting process with the 3 mm-thick polymethyl methacrylate. This experiment used a 60 Watt-powered laser cutting machine to take the specimen in the form of a 30 mm-long horizontal line. The laser head distance ranged from 6 to 10 mm and cutting speed varied from 4 to 8 mm/s. A stereo zoom microscope with 30 times magnification was used to measure the gap. The research resulted in 0.582 to 0.931 mm as the value of the width gap in the cutting of 3 mm thick 60 Watts-powered polymethyl methacrylate (PMMA). The laser head distance and cutting speed contributed to the gap width of the product. The increased cutting speed and gap distance resulted in the smaller gap width.