Dissertations / Theses on the topic 'Laser beam cutting'

Thesis (MEng) - Swinburne University of Technology, Industrial Research Institute Swinburne - 2006.
A thesis submitted in fulfillment of the requirement for the degree of Master of Engineering by Research, Industrial Research Institute Swinburne, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology - 2006. Typescript. Includes bibliographical references (p. 113-116).

The Industrial Laser is firmly established in metalcutting as the tool of choice for many applications. The elevator division of Montgomery KONE Inc., in an effort to move towards quality, ontime, complete deliveries and 100% customer satisfaction, decided to invest in new equipment to improve manufacturing processes. A huge investment is proposed for a laser-cutting machine. It is the responsibility of Manufacturing Engineering to direct the management by justifying its benefits, which includes payback time and financial gains. Factors such as common line cutting, automated material handling system and cutting time were involved in justification of the initial cost of a laser-cutting machine. Comparative statistics on appropriate factors accurately determine and justify the initial cost of a laser-cutting machine.

Laser cutting is one of the most important applications of laser in manufacturing industry; it is mainly used for sheet metal cutting. In laser cutting, performing real-time evaluation of laser cut quality is very important to the advancement of this process in industry. However, due to the dynamic nature of the laser cutting process specially when cutting ferrous alloys using oxygen as an assist gas, laser cut quality cannot be easily predicted; therefore, the quality inspection of the laser cut is performed by off line inspections of the edges of the metal by skilled operators. This methodology is carried out after the process and thus cannot maintain a good quality if the process performance is out of control. Therefore, the objective of the research project is to qualify and develop a sensor system that ensure fault recognition online and can automatically control the laser metal cutting process to achieve good quality cut. For the realization of this objective the following has been done: - study the relationship between process parameters and cut quality characteristics; - identify the best sensors that can be used to monitor the process; - design and develop an experimental setup to test the proposed sensors; - collect and analyze data from the proposed sensors and correlate them to specific cut quality characteristics (process state variables); - develop direct relationships between the process signals and cut quality; - develop appropriate strategy for process control; - design and develop an integrated monitoring and control system; - test and evaluate the proposed system using simulation. In this study, a new technique for the determination of cut quality of sheet steels under the CO2 laser cutting process has been established. It is based on on-line detection and post-processing analysis of light radiation and acoustic emissions from the cut kerf. Determination of machining quality during cutting is best done through the measurement of surface roughness and kerf widths, as these are the two parameters that vary in successful through cuts. These two quality parameters can further be correlated to the two dominant process parameters of laser power and cutting speed. This study presents an analysis of acoustic emissions and reflected light for CO2 laser cutting of steel plates, and discusses their use for the estimation of cut quality parameters of kerf width and striation frequency for mild steel plates of 3mm, 5mm, 8mm, and 10mm thicknesses. Airborne acoustic and light signals are acquired with a microphone and a photodiode respectively, and recorded with a PC based data acquisition system in real time. The signals are then analyzed to establish a correlation between the signals obtained and the cut quality achieved. Experimental evidence shows that the energy levels of acoustic emission signals (RMS analysis) can be used to maintain the cutting process under steady state condition. On the other hand, the light intensity signal fluctuates with a frequency that corresponds to the frequency of striations formed on the cut surface; therefore it can be used to regulate cutting speed and laser power to obtain an optimum cutting condition and best cut quality. The validity of the proposed control strategy was tested experimentally by simulating the variations of cutting speed and examining their effect on the signals. So far, the prototype used for experimentation has been successful in providing correct information about cut quality in terms of striation frequency, and also about the state of the process where the microphone signal was successful in determining system failure or improper cutting conditions. A microprocessor based control system utilizing the PID control algorithm is recommended for the implementation of the control strategy. The implementation requirements of the proposed system for industrial use are then discussed. A new setup for the coaxial monitoring of CO2 laser cutting using a photodiode is proposed to enhance the quality of the signal and also to protect the photodiode from the harsh cutting environment. It is also proposed that an open control architecture platform is needed to enhance the integration of the proposed process control functions. Conclusions and future research directions towards the achievement of Autonomous Production Cell (APC) for the laser cutting process are then given.

A numerical model of the temperature field during pulsed laser cutting of thin sheets (approximately 2.5 x l0^-5 m) was developed. Cutting was simulated through removal of nodes from a finite difference scheme based on sensible heating to the phase change temperature and a single value of latent heat (melting or vaporization). The pulsed laser model predicts a heat-affected zone of less than 0.02 mm for pulsed laser cutting. For comparable cutting with a continuous power laser, a heat-affected zone between 0.05 and 0.10 mm is predicted. Thermal stress levels were predicted to be an order of magnitude lower for pulsed laser cutting than for continuous power cutting. The stress levels predicted by the model also increased with cut speed. Experimentally, pulsed laser cutting yielded better cut quality, based on less cracking, than continuous power cutting. In addition, the cut quality deteriorated as the cutting speed was increased for the continuous power laser. Presently, application of pulsed laser cutting is limited by its low cutting speed, which is restricted by the energy density of the laser. The model predicts that increasing energy density will decrease the size of the heat-affected zone and increase the maximum cutting speed. Therefore, pulsed laser cutting at high speeds should be attainable without deterioration in cut quality.

Master of Science

Thesis (M.S.)--West Virginia University, 2003.
Title from document title page. Document formatted into pages; contains xiii, 116 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 102-103).

Thesis (M.S.)--Missouri University of Science and Technology, 2009.
Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed August 14, 2009) Includes bibliographical references (p. 16-17).

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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP

The final work elaborated in the scope of master's studies of the branch 2303T002 submitted use of modern technologies in the production of flat sheet metal parts from the material 11 373. Work is set for cold shaping of metal by means of cutting. Production on sequence shearing tool is based on series 350 000 pieces per year. Universal hydraulic press CUPS 63 DEU with shearing force 630 kN is selected for realization. Work is also focused on the production of the same components using plasma, laser and water CNC equipment and the subsequent economic evaluation of all variants of the production. In enclosure there is drawing documentation for cutting tool.

This diploma thesis treats about technology of laser and its use in practice. It describes principle, available types and possible applications in material working. The work is specifically focused on the technology of laser cutting. Diploma thesis was written in co-operation with Technologické centrum a. s. company. This company disposes of four cutting lasers. The aluminium template was produced by laser Byspeed 5200 ARC.

The description and characteristic of the material cutting process technology by means of laser and plasma beams. The safety of both technologies. Technical-economic comparison of both material cutting methods. The evaluation of the cutting quality according to ČSN EN ISO 9013 Standard.

The master’s thesis deals with laser cutting technology and application in the industry. The first part of the thesis describes principle of laser beam creation, division and application of lasers in industry. The Experimental part is focused on cutting the workpiece using a laser and water jet in company named SMR Plus s.r.o., sample preparation and examining the structure of workpiece. Surface structures are compared with workpieces from water jet at the end of thesis.

Applycation of laser beam technology to technological process. The kinds of laser dividing, its safety and arrangement. Technology-economical advantage in production of aluminium table. Description of laser machine and workshop and whole company.

The thesis deals with the technology of laser cutting. The beginning is concerned with a general description of laser technology and laser division into basic groups. Next part refers to possible industrial use of laser beam, especially for cutting. Other chapters deal with the components suitable for the manufacture of this technology, technical preparation of production and the proposal to increase manufacturing flexibility when changing products. The last part is devoted to technical and economic evaluation.

This thesis deals with the possibilities of cutting strong steel metal sheets by means of laser and problems rising from the incision, their technological investigation. The basic philosophy consists on the research of the interaction between laser bunch and material, depending on the position of focal poin and sequential results in spec. heat. It determines the main parametres of the incision (from the total quantities and matematical description) which have the biggest effect on the occurence of wide cut and perhaps even on the quality of products and consequential optimalization of these quantities.

Gegenstand der Dissertationsschrift ist eine Darstellung des gegebenen Wissensstandes zum Scherschneiden anhand der Literatur, mit einer Einordnung des Schrägschneidens. Auf dieser Grundlage erfolgt eine Verfahrens- und Prozeßbeschreibung des Schrägschneidens, als Variante des Scherschneidens, insbesondere eine Untersuchung des auftretenden Verschleisses. Es wird die Anwendung des Laser-Pulver-Auftragschweißen an Schneidwerkzeugen zur Verschleißminimierung erprobt und bewertet.

Analysis of a laser beam possibilities. Technology of components‘ structure. Design of disposition of a laser’s workplace. Design of a folding brake workplace. Concept of stock holding. Operating expenses of a laser technology. The technical – economic summary.

The thesis is focused on theoretical analysis and physical description of laser beam technology. It deals with possibilities and concrete methods of laser technologies in perspective of metal machining and in detail it describes CO2 laser and its inclusion to the manufacturing process in concrete engineering company. Further it describes the components base and the construction technology of typal representatives. The thesis includes the proposition of solution of increase the productivity of the laser workplace and also technical and economical evaluation of this technology.

Le laser à impulsions ultra-courtes constitue un procédé innovant et très avantageux pour la découpe de céramiques piézoélectriques PZT. Grâce à un fort confinement spatiotemporel de l'énergie au cours de l'interaction, ce système minimise les dégâts collatéraux et préserve l'intégrité physique du matériau sur des échelles micrométriques. Néanmoins, une propagation de faisceau mal maîtrisée, associée à des mécanismes d'interaction complexes fonction de la cible irradiée, peuvent impliquer de fortes disparités sur la qualité d'usinage. Dans le cadre d'une application industrielle donnée, ces travaux nous ont donc permis d'approfondir les principales étapes d'optimisation d'un tel procédé selon des critères de reproductibilité, de qualité et de rapidité. Pour cela, nous avons tout d'abord souligné l'influence des propriétés gaussiennes des faisceaux et de leur perturbation afin de définir la distribution énergétique au niveau des plans de focalisation. Aussi, la quantification de l'interaction via les critères de seuil et de taux d'ablation, d'incubation et de saturation a contribué à comprendre la réaction du matériau de manière macroscopique. Les problèmes méthodologiques inhérents à leurs calculs ont été mis en évidence et ont permis par la suite d'anticiper les formes d'usinage ainsi que les temps de procédé. Dans un second temps, l'optimisation des paramètres laser s'est appuyée sur des caractérisations aussi bien qualitatives pour l'aspect visuel que quantitatives avec l'estimation de la stoechiométrie et des contraintes résiduelles au niveau des flancs d'usinage. Nous avons en outre tiré profit de la piézoélectricité afin de développer une méthode d'observation in situ de la réponse à l'onde de choc laser contribuant à la compréhension des fissurations apparentes. Nous proposons au terme de ce travail un jeu de paramètres optimal pour la découpe de PZT assurant une bonne répétabilité du procédé tout en minimisant les défauts d'usinage comme la fissuration, les dépôts de surface et les irrégularités de bords. Des essais sur la mise en forme spatio-temporelle de faisceau sont enfin abordés principalement en tant que perspective d'accélération du procédé et encouragent son utilisation pour une future industrialisation

The diploma´s thesis deals with cutting beams technologies. It shows the current knowledge of these cutting methods, their possibilities and applications. The practical part rates benefits of replacement water jet with laser from economic and technological perspective.

This study deals with technology of abrasive water jet material cutting and influence of cutting head feed rate on surface topography of cut walls with regards to roughness. Eight parameters were chosen based on the CSN EN ISO 4288 standard representing quality of surface after AWJ cutting. When AWJ cutting the chosen material – commercially pure ASTM B265 grade 2 titanium – feed rate was being changed and in order to obtain information about each parameter´s distribution in various depths of the cut, surface composition was evaluated. It was found out that feed rate has significant influence on surface and that the profile elements´ width grows when increasing the feed rate and cut depth. Furthermore, two selected feed rate results were compared to laser beam technology and conclusion for the selected material was made that AWJ cutting is more preferable due to final roughness and no heat affect on the material.

碩士
國立成功大學
機械工程學系碩博士班
94
The objective of this thesis is to investigate the thermal stress of the soda-lime glass by multiple laser cleaving. The line beam source of CO2 laser combined with the Nd-YAG pulse laser were used to heat soda-lime glass surface, and also the cooling air was used to cool the surface of the cleaving. In the numerical analysis, the finite element was used to analysize the thermal stress and crack growth problem in three-dimensional domain, and also the thermal stress was investigated in depth. In the experiment, the photography method was used to record the crack growth and the optical microscope was used to observe and analysize the cutting quality of the samples. It was shown the crack growth will be accelerated and extended in depth, when the CO2 laser with Nd-YAG pulse laser were used to heat on the surface of glass. The crack direction can be under control along the cleaving path. The quality of cleaving by multiple laser is much better than the conventional glass cutting by laser.

碩士
華梵大學
機電工程學系博碩專班
98
The aim of this paper is to study the laser breaking technique using a line-shape laser beam for LCD glass. The laser beam moves along the desired cutting path, and then the substrate will be broken into two pieces due to the thermal stress. The laser source was a CO2 laser. The relationships between the laser power and the cutting speed were obtained. The mechanism of fracture extension, the machining parameters, and the breaking quality were discussed in this study. It can be found that the straightness for the asymmetric cutting is better than that from the circular laser beam. But the cutting speed that can be attained for the line-shape laser beam is less than that from the circular laser beam. The SEM photographs of the breaking surface were obtained to analyze the fracture mechanism during the laser cutting process. An image processing system of crack detection was employed to obtain the crack image continuously during the laser-breaking process. It can be found that the breaking process can be divided into the initiation stage, stable growth stage, and the end fracture stage. Finally, the finite element software ANSYS was employed to calculate the temperature and stress distributions to explain the mechanism of the fracture extension.

碩士
國立成功大學
機械工程學系碩博士班
92
The object of this thesis is to study the thermal stress of the glass plate in laser cutting. A high power CO2 laser with Gaussian beam mode was used as a moving line shape heat source on a soda-lime glass plate. In the analysis of the thermal stress problems of soda-lime glass plate,the transient thermal was simulated numerically. The non-linear finite element software, ABAQUS, was used to simulate the thermal stress problem for an uncoupled thermal-mechanical system in three-dimensional domain. The temperatures, transient thermal stress during the laser cutting process were calculated. The process parameters affecting the stress value were also investigated. 　　It was shown that the crack and cutting quality was different on the glass surface along with the different rotating angle, the crack spreaded along with thermal diffusion direction and increased with rotating angle, and the fracture mode was not the opening mode. As the rotating angle being 0 degree, the chip formation is along with the depth direction due to the thermal diffusion asymmetry.

碩士
國立高雄應用科技大學
機械工程系
106
In recent years, due to the rapid development of the semiconductor industry, for some micro-package structures, the processing method of wafers has also been developed from the conventional cutting method to the laser cutting method. The yield and manufacturing quality of the packaged products are also greatly improved. This study is designed to investigate the influence of multi-beam matrix laser cutting process on NAND Flash package quality, and find out the important process parameters of multi-beam matrix laser process are defocus amount, laser power, cutting speed and material thickness. Then use the finite element analysis software ANSYS to obtain the minimum temperature influence, stress and strain, and use Taquchi method and variance analysis (ANOVA) to find the optimal temperature combination, the optimal combination of stress and strain and its contribution. degree. Finally, the reliability is tested by verification experiments, and the error is found to be within 3.638%. It is confirmed that the optimized parameter combination has high repetitiveness. It is hoped that this study can contribute to the multi-beam matrix laser cutting process.

Laser beam cutting is an attractive and innovative manufacturing process which has many advantages compared to conventional cutting methods. However, with increasing workpiece thickness an increase of the roughness along the kerf surface can be observed, which, in turn, can negatively affect the mechanical properties, in particular the fatigue strength. In this context, the impact of laser cutting on fatigue behavior is discussed in this work. Specimens were cut out by disk laser from sheets with 2 mm, 4 mm and 6 mm thickness made of metastable austenitic stainless steel type AISI 304. Fatigue specimens with different surface conditions were tested in order to separately evaluate the influence of the different kinds of macroscopic defects produced by the cutting process. Additionally, the notch effect sensitivity for different amounts of deformation-induced α'-martensite induced before cyclic tests was evaluated using a specific notch geometry. Furthermore, based on the fact that high frequency testing is performed in the present investigation, the likely influences of test frequency on material response must be considered. For this reason and because metastable austenitic stainless steels are well known for their strain rate sensitivity, the steel AISI 304 and the role of surface micro-defects produced by laser beam cutting were analyzed regarding the influence of load frequency on the cyclic response and fatigue behavior, and the findings of the investigation are thoroughly discussed in this work. Fatigue tests were performed at load frequencies of 100 Hz and 1,000 Hz using two resonance pulsation test systems, as well as by means of a servo-hydraulic test machine at 1 Hz and 50 Hz. Fractographic analyses served to evaluate the failure-relevant characteristics responsible for crack initiation. Moreover, scanning electron microscopy was used to assess the changes caused by laser cutting on the geometrical and microstructural features. The qualitative analyses of the cut kerf characteristics were accomplished by means of optical microscopy. The cyclic deformation behavior was characterized based on the evaluation of stress-strain hysteresis loops and temperature measurements. The deformation-induced phase transformation from γ-austenite to α'-martensite was globally and locally evaluated by means of magneto-inductive measurements and electron backscattered diffraction analysis, respectively. The analyses showed that laser beam cutting creates three kinds of defects, which are a pronounced relief-like structure along the cut surface, burr in the underside of the cut edge and pores in the interface between the recast layer and base material or inside the recast layer. As a consequence, the fatigue strength of parts cut by laser beam is around 40% lower in comparison to specimens in a macroscopically quasi defect-free state. The most significant reduction of fatigue life is attributed to the notch effect of the burr, followed by the notch effect created by pores for 4 mm and 6 mm thick specimens, while surprisingly the influence of the surface relief is of minor significance. An evaluation of the fatigue results based on comprehensive fractographic analyses allows to explain the reasons for distinct differences between the aforementioned influence factors. Furthermore, the notch sensitivity of the steel AISI 304 increases as the amount of α'-martensite formed prior to the cyclic experiments becomes higher. Moreover, the impact of test frequency on the cyclic deformation response, deformation-induced phase transformation and fatigue behavior was characterized as well as the role of surface micro-defects on the fatigue behavior as a function of test frequency was identified. The assessment showed that higher amounts of α'-martensite formation and lower plastic strain amplitudes were observed when the cyclic experiments were carried out at lower frequency, promoting higher fatigue strengths. However, the influence of test frequency for specimens containing surface micro-defects is dominant in the low cycle fatigue to high cycle fatigue regime, whereas in the high cycle fatigue and very high cycle fatigue range the fatigue life determining parameter is the severity of the micro-notches present along the laser cut surface.
Das Laserstrahlschneiden stellt ein innovatives Verfahren dar, welches im Vergleich zu konventionellen Schneid prozessen eine Vielzahl an Vorteilen aufweist, aber mit zunehmender Blechdicke auch den entscheidenden Nachteil der Zunahme der Oberflächenrauheit der Schnittkanten, was sich negativ auf die mechanische Festigkeit, insbesondere die Schwingfestigkeit, auswirken kann. Deswegen ist die Anwendung dieser Technik zur Herstellung von strukturellen Bauteilen aufgrund der Bildung ausgeprägter Oberflächenreliefs und dem Fehlen zuverlässiger Schwingfestigkeitsdaten begrenzt. In diesem Zusammenhang werden in dieser Arbeit die Auswirkungen des Laserschneidens auf das Ermüdungsverhalten diskutiert. Aus Blechen des metastabilen Austenitstahls AISI 304 mit Dicken von 2 mm, 4 mm und 6 mm wurden Proben mit Hilfe eines Scheibenlasers herausgeschnitten. Ermüdungsproben unterschiedlicher Oberflächenqualität wurden getestet, um den Einfluss der verschiedenen Arten von makroskopischen Defekten, die durch den Schneidprozess erzeugt wurden, separat zu bewerten. Zusätzlich wurde die Empfindlichkeit der Kerbwirkung bei unterschiedlichen Gehalten an verformungsinduziertem α'-Martensit, welcher vor den zyklischen Versuche erzeugt wurde, unter Verwendung einer spezifischen Kerbgeometrie ausgewertet. Außerdem, basierend auf der Tatsache, dass in der vorliegenden Untersuchung eine Hochfrequenzprüfung durchgeführt wurde, wurden der Stahl AISI 304 und die Rolle von Oberflächenmikrodefekten durch das Laserstrahlschneiden hinsichtlich des Frequenzeinflusses auf das zyklische Ansprechverhalten und Ermüdungsverhalten analysiert. Ermüdungsprüfungen wurden bei Frequenzen von 100 Hz und 1000 Hz unter Verwendung von zwei ähnlichen Resonanzpulsationstestsystemen, sowie mittels einer servohydraulischen Prüfmaschine bei 1 Hz und 50 Hz durchgeführt. Fraktographische Analysen dienten dazu, die für die Rissinitiierung verantwortlichen fehlerrelevanten Eigenschaften zu bewerten. Darüber hinaus wurde die Rasterelektronenmikroskopie verwendet, um die durch das Laserschneiden verursachten Veränderungen der geometrischen und mikrostrukturellen Eigenschaften zu bewerten. Die qualitativen Analysen der Schnittkanteneigenschaften wurden mittels optischer Mikroskopie durchgeführt. Das zyklische Verformungsverhalten wurde anhand der Auswertung von Spannungs-Dehnungs-Hystereseschleifen und Temperaturmessungen charakterisiert. Die verformungsinduzierte Phasenumwandlung von γ-Austenit zu α'-Martensit wurde global und lokal mittels magneto-induktiven Messungen bzw. Elektronenrückstreubeugungsanalyse ausgewertet. Die Analysen zeigen, dass ein ausgeprägtes Relief entlang der Schnittfläche sowie ein Grat an der Unterseite der Schnittkante bei 2 mm, 4 mm und 6 mm dicken Platten gebildet wurden. Zusätzlich haben sich Poren in der Grenzfläche zwischen dem umgeschmolzenen Material und dem Grundmaterial oder innerhalb des umgeschmolzenen Materials bei den 4 mm und 6 mm dicken Platten gebildet. Infolgedessen zeigen die laserstrahlgeschnittenen Proben eine 40% niedrigere Dauerfestigkeit im Vergleich zu den Proben, welche in einem makroskopisch quasi defektfreien Zustand sind. Obwohl beim Schneiden dickerer Platten gröbere Oberflächen entstehen, ist die Verringerung der Dauerfestigkeit entgegen den Erwartungen unabhängig von der Probendicke. Die größte Verringerung der Ermüdungslebensdauer ist auf die Kerbwirkung des Grates zurückzuführen, gefolgt von der Kerbwirkung des Oberflächenreliefs für 2 mm dicke Platten bzw. des Einflusses von Poren im Fall der 4 mm und 6 mm dicken Platten. Ein Zusammenhang zwischen der Phasenumwandlung von γ-Austenit zu α'-Martensit, die durch zyklische Verformung entsteht, und der Lastfrequenz wurde nachgewiesen. Eine niedrigere Prüffrequenz ruft für den untersuchten unsymmetrischen Belastungsverlauf einen signifikanten zyklischen Kriecheffekt, höhere mittlere Dehnungsniveaus, höhere Mengen an α'-Martensitbildung, geringere plastische Dehnungsamplituden und daher höhere Ermüdungsfestigkeiten hervor. Bei Proben mit Oberflächenmikrodefekten, die durch das Laserstrahlschneiden erzeugt werden, hängt der Einfluss der Prüffrequenz auf das Ermüdungsverhalten vom aufgebrachten Belastungsniveau ab. Dieser Einfluss dominiert im LCF zu HCF Bereich, während im Übergang vom HCF in den VHCF Bereich die Ermüdungslebensdauer von der Schwere des Schadens abhängig ist, welcher in der Probe durch lebensdauerbestimmende, zufällig entlang der lasergeschnittenen Reliefoberfläche eingebrachten Mikrokerben hervorgerufen wird.

Gegenstand der Dissertationsschrift ist eine Darstellung des gegebenen Wissensstandes zum Scherschneiden anhand der Literatur, mit einer Einordnung des Schrägschneidens. Auf dieser Grundlage erfolgt eine Verfahrens- und Prozeßbeschreibung des Schrägschneidens, als Variante des Scherschneidens, insbesondere eine Untersuchung des auftretenden Verschleisses. Es wird die Anwendung des Laser-Pulver-Auftragschweißen an Schneidwerkzeugen zur Verschleißminimierung erprobt und bewertet.:1. Einleitung 2. Systematisierung von Profilen und Rohren 3. Herstellung von Profilen und Rohren 3.1. Fertigung von Profilen und Rohren 3.2. Trennen von Profilen und Rohren 4. Zerteilen – Stand der Technik 4.1. Systematik der Zerteilverfahren 4.2. Scherschneiden von Feinblechen 4.2.1. Schneidspalt und Schnittflächenqualität 4.2.2. Schneidkraft Scherschneiden im vollkantigen Schnitt Scherschneiden im kreuzenden Schnitt, Schrägschneiden 4.2.3. Werkzeugverschleiß 4.2.4. Schneidgeschwindigkeit 4.3. Beschichtungen an Werkzeugen zum Schneiden 5. Zielstellung und Inhalt der Arbeit 6. Scherschneiden von Leichtbauprofilen und –rohren 6.1. Schneidvorgang 6.2. Werkzeugaufbau 6.3. Auslegung von Scherschneidwerkzeugen für Leichtbauprofile und –rohre 6.4. Versuche zum Scherschneiden mit Schneidmessern von Leichbauprofilen und –rohren 6.4.1. Schneidspalt und Schnittflächenqualität 6.4.2. Schneidkraft und Schneidkraftverlauf 6.4.3. Werkzeugverschleiß 7. Laser-Pulver-Auftragsschweißen hartstoffverstärkter Verschleißschutz- schichten auf Schneidflächen von Schneidmessern 7.1. Laser-Pulver-Auftragschweißen 7.2. Werkstoffe 7.2.1. Grundmaterial 7.2.2. Zusatzwerkstoffe/Hartstoffe 7.2.3. Versuche zum Laser-Pulver-Auftragschweißen an Schneidflächen von Schneidmessern 7.3. Versuche zum Schrägschneiden mit hartstoffverstärkten Verschleißschutzschichten 8 Vergleich und Bewertung der Beschichtungssysteme 9. Zusammenfassung und Ausblick Anhang Literaturverzeichnis Abbildungsverzeichnis Tabellenverzeichnis