Relevant bibliographies by topics / Cutting defects

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Cutting defects'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Cutting defects"

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Hou, Ning, Li Zhou, Shu Tao Huang, and Li Fu Xu. "Finite Element and Experimental Analysis of Edge Defects Formation during Orthogonal Cutting of SiCp/Al Composites." Advanced Materials Research 500 (April 2012): 146–51. http://dx.doi.org/10.4028/www.scientific.net/amr.500.146.

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In this paper, a finite element method was used to dynamically simulate the process of the edge defects formation during orthogonal cutting SiCp/Al composites. The influence of the cutting speed, cutting depth and rake angle of the PCD insert on the size of the edge defects have been investigated by using scanning electron. According to the simulated results, it can be provided that the cutting layer material has an effect on transfer stress and hinder the chip formation in the critical transition stage, and the critical transition point and distance are defined in this stage. The negative shear phenomenon is found when the chip transit to the edge defects in the flexure deformation stage, so the process of the chip formation is the basis of the edge defects formation. In addition, the relationship between the nucleation and propagation direction of the crack and the variation of the edge defect shape on the workpiece was investigated by theory, and it found that the negative shear angle formation is the primary cause of the edge defect formation. A mixed mode crack is found in the crack propagation stage. The sizes of edge defects were measured by the experiment and simulation, and the edge defect size decrease with the increasing of tool rake angle, while increase with increasing cutting depth and cutting speed.
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Zou, Chang Bin, Chuan Zhen Huang, Bin Zou, Yu Huan Fei, Han Lian Liu, Hong Tao Zhu, and Jun Wang. "Establishment of the Low Defect Ceramic Cutting Tool Database." Key Engineering Materials 589-590 (October 2013): 357–60. http://dx.doi.org/10.4028/www.scientific.net/kem.589-590.357.

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This paper analyzes the reasons of the defects generation of the ceramic cutting tool materials. The defects in the ceramic cutting tool materials are caused by chemical compatibility and physical mismatch during the designing process, and caused by grain abnormal growth and sintering parameters during the preparation stage. The database of low defect ceramic cutting tool is established and the data structure of the database is described. The users can use the database to design the tool material system through the mode that can reduce the defects.
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Lu, Ji Li, and Ming Xing Lin. "A Cutting Line Positioning and Defects Detection System for Polyurethane Plate Based on Computer Vision." Advanced Materials Research 562-564 (August 2012): 119–22. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.119.

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In this paper, we present a design of a real-time computer vision system for polyurethane plate cutting line positioning and defects detection. The main defect of polyurethane plate is uneven texture which doesn’t meet the product requirements. We translate the original image to gray image and find the points with strongest gray as the cutting line, extract feathers and detect defects. The experimental results show that it is easy and effective to position cutting points and find defects of polyurethane plate, which can meet the requirements of production and has great practical value.
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Kondo, Yasuo, Yuki Doi, Takafumi Adachi, Satoshi Sakamoto, Kenji Yamaguchi, Tsuyoshi Fujita, and Mitsugu Yamaguchi. "Proposal of Constant Load Feeding Method as a High Precision Cutting Tool for CFRP." Advanced Materials Research 1136 (January 2016): 209–14. http://dx.doi.org/10.4028/www.scientific.net/amr.1136.209.

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An innovative cutting method, constant load feeding method, is proposed as a high precision secondary working tool in CFRP cutting. The constant load feeding can restrain the occurrence of cutting defects such as burr and scuffing in a diamond saw cutting. The combining of constant load feeding with point contact eliminated most of the cutting defects even in the CFRP cutting with a low rigidity cutting tool like the diamond saw blade. In addition, there was no apparent cutting damage on the cutting surface obtained from the drilling with constant load feeding. These facts indicate that the self-generated feed rate in the constant load feeding would be the optimal feed rate to realize a defect-free drilling of CFRP composites.
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Twisselmann, U. "Cutting rectangles avoiding rectangular defects." Applied Mathematics Letters 12, no. 6 (August 1999): 135–38. http://dx.doi.org/10.1016/s0893-9659(99)00092-0.

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Zou, De Jin, Shu Tao Huang, Li Zhou, Li Fu Xu, Ning Hou, and Jing Lei Wang. "Experimental Study on Exit Edge Defects in Two Dimension Cutting of SiCp/Al Composites." Materials Science Forum 723 (June 2012): 326–31. http://dx.doi.org/10.4028/www.scientific.net/msf.723.326.

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In this paper, the influence of the tool rake angle, cutting depth and cutting speed on exit edge defect sizes are discussed by the two dimension cutting experiment of SiCp/Al composites. The sizes are measured by using the Keyence VHX-1000C type super preview 3D microscopy. The results indicate that exit edge defect sizes are influenced greatly by tool rake angle and cutting depth, and are influenced slightly by the cutting speed. The edge defect sizes have an overall downward trend when the tool rake angle is smaller than 5°, and have an apparent upward trend when the tool rake angle (γ0) is 10°.The length (L), height (H) of exit edge defects and the negative shear angle increase with increasing of the cutting depth.
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Zeng, Chao, Chunqing Wang, Yanhong Tian, Chunjin Hang, Wei Liu, and Rong An. "Characterization of the Hot-Cutting Defect Generated from Shape Machining of Alumina Green Tape in the Ceramic-Package Manufacturing Process." Journal of Microelectronics and Electronic Packaging 12, no. 1 (January 1, 2015): 55–60. http://dx.doi.org/10.4071/imaps.433.

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This paper characterizes the rarely mentioned but very damaging defects formed during the hot-cutting process of alumina green tape. Surface and edge morphologies of the hot-cutting surface and a natural surface were examined by optical microscope and scanning electron microscope before and after the sintering process. Obviously different from the natural surface, the hot-cutting surface had a transverse crack-like defect scattered over the surface and a tearing, notch-like defect on the lower edge. A 31 × 22 full factorial experiment was conducted to evaluate the flexural strength controlled by the hot-cutting defect and inherent defects in ceramics. Variance analysis revealed a significant interaction between surface and wearing. The wearing factor had a statistically significant impact on the fracture strength of the top surface but not that of the side and bottom surfaces.
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Zhou, Xiang, Yi, Gao, and Xie. "Experimental and Numerical Study of Edge Defects When Turning 17vol.% SiCp/2009Al Composites." Applied Sciences 9, no. 18 (September 11, 2019): 3817. http://dx.doi.org/10.3390/app9183817.

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In this work, a three-dimensional large-deformation thermo-elastic-plastic finite element model for oblique cutting was established to analyze edge defects during the machining of 17vol.% SiCp/2009Al composites. The formation process of edge defects at the workpiece exit during turning was investigated, and the influence of depth of cut, feed rate, and spindle speed on the edge defect sizes at the workpiece exit was explored. The results show that a negative deformation plane began to form as the cutting tool approached the exit end of cut, and the resultant cracks propagated towards the negative shear deformation plane, which led to workpiece edge defects. In addition, the size of edge defects increased with increasing depth of cut and feed rate, while the spindle speed had less influence on the size of edge defects. The numerical results of the effects of cutting parameters on edge defects were also compared to those of the turning experimental data, and were found to be in reasonable agreement.
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Zhang, Shuo, and Wenjun Zong. "Micro Defects on Diamond Tool Cutting Edge Affecting the Ductile-Mode Machining of KDP Crystal." Micromachines 11, no. 12 (December 14, 2020): 1102. http://dx.doi.org/10.3390/mi11121102.

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As a soft-brittle material, the machined surface quality of potassium dihydrogen phosphate (KDP) crystal is heavily affected by the edge quality of the diamond cutting tool. However, nanoscale micro defects inevitably occur on the freshly sharpened tool edge, and the machining mechanism for KDP crystal remains unclear. Therefore, in this work, three types of tool-edge micro defects are classified according to their cross-sections, including the blunt-edge, crescent-edge, and flat-edge micro defects. Moreover, the smoothed particle hydrodynamics (SPH) method is employed to reveal the material removal mechanism of KDP crystal with consideration of different tool-edge micro defects, and the flat-edge micro defects are subdivided into flat edge A (similar to flank wear) and flat edge B (similar to chamfered edge) on the basis of their effects in machining. The simulation results indicate that the surfaces machined by crescent edge and flat edge A are unsmooth with large-size defects due to the disappearance of hydrostatic pressure beneath the cutting edge. As for the blunt edge and flat edge B, the machined surfaces are smooth with a favorable increment of hydrostatic pressure for processing brittle materials, which indicates that a solution to eliminate the tool-edge micro defects is necessary, e.g., the passivation method. For keeping the cutting edge as sharp as possible in removing the tool-edge micro defects completely by passivation, the effect of tool shank depression angles on the geometries of the passivated cutting edge is investigated, and a high-quality cutting edge with a micro chamfered edge is obtained after passivation at a depression angle of 60° and re-sharpening of the rake face. Finally, the tool cutting performance after passivation is validated through fly-cutting experiments of KDP crystal. The chamfered edge can produce the best defect-free surface with the minimum surface roughness.
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Phophoung, Aphichad, and Viboon Tangwarodomnukun. "Defect Reduction in the CO2 Laser Cutting of Glassware Rim." Materials Science Forum 872 (September 2016): 133–37. http://dx.doi.org/10.4028/www.scientific.net/msf.872.133.

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Defects in glassware are unacceptable in terms of product strength and aesthetics. The unsmooth cut rim of glassware can often be found in the laser trimming of excessive part after blow molding process. Such defect is basically not safe to use and has to be rejected from the production, thereby inevitably increasing the manufacturing cost and time. Hence, this research aims to reduce the defect in glassware rim induced by the laser cutting process. A wine glass was used as a workpiece sample in this study. Laser power, laser cutting time and workpiece rotational speed were tested and optimized to reduce the defects by using the response surface methodology. The optimum condition for the laser cutting of wine glass was found to be 225-W laser power, 2.4-s cutting duration and 335-rpm rotational speed.
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Dissertations / Theses on the topic "Cutting defects"

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Afsharian, Mohsen [Verfasser]. "The Two-Dimensional, Rectangular, Guillotineable-Layout Cutting Problem with Defects / Mohsen Afsharian." Aachen : Shaker, 2013. http://d-nb.info/1051575575/34.

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Miah, Farid. "Numerical and experimental analysis of CFRP machining process in orthogonal cutting." Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30005.

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Les matériaux composites, y compris le PRFC (polymère renforcé de fibre de carbone), sont de plus en plus utilisés en aéronautique et dans l'automobile, ce qui soulève actuellement de nombreuses complications dans les processus d'usinage. Comme ces matériaux sont fabriqués en plusieurs phases, ils sont responsables d'une mauvaise qualité d'usinage et de défauts indésirables. Cette thèse vise à mieux comprendre la technique physique fondamentale impliquée dans le mécanisme de formation de copeaux dans le découpage orthogonal d'usinage en PRFC par des études numériques et expérimentales combinées. Ensuite, l'analyse se concentre sur la manière dont certains paramètres de coupe, par exemple, la profondeur de coupe, affectent les efforts de coupe, la qualité de surface, les délaminations entre couches, la génération de fissures internes et la forme et la taille de copeaux générées. De plus, une observation expérimentale a été faite pour déterminer la profondeur de coupe minimale en dessous de laquelle le matériau ne peut pas être coupé en douceur sur toute la surface. Ce travail de recherche a été complété par une étude préliminaire sur le mécanisme d'usure des outils de coupe
The composite materials, including CFRP (Carbon Fiber Reinforced Polymer), are increasingly used in aeronautics and automotives which is currently raising many complications in the machining processes. As those materials are made with multiple phases, they are accountable for poor machining quality and undesired defects. This thesis seeks to better understand the fundamental physical technique involved in chip formation mechanism in orthogonal cutting of CFRP machining by combined numerical and experimental studies. Then, the analysis focuses to how certain cutting parameters, e.g., cutting depth, affect to the cutting efforts, surface quality, interply delaminations, inner crack generation and to generated chip shape and size. Moreover, an experimental observation has been made to find out the minimum cuttable depth below which the material does not get cut smoothly over the whole surface. This research work has been finished by a preliminary study on cutting tool wear mechanism
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Králík, Petr. "Studium řezných vad při oxidačním dělení mezních tlouštěk konstrukční oceli pevnolátkovým laserem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231518.

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This thesis deals with research of cutting defects at laser cutting of 15 mm thick carbon steel by Bystronic fiber laser with emphasis on wide cutting gap, which causes enlargement of wide of cutting gap and deterioration of roughness of cutting edge and increase of creation fo heat. The introduction describes the main types of lasers used for cutting sheet of metal and compare their advantages and disadvantages. Also described is a cutting process and its parameters, and also the possible cutting defects. An experiment was conducted on steels S355MC and S235JR and cutting defects were analyzed in relation to the set of cutting parameters. Next part determines the extent of the recommended parameters that should be chosen for specific cutting conditions and is balanced recommendations regarding the choice of material to be cut, and technological adaptations parts. In the last part is measured roughness of a wide cutting gap, the width of the heat affected zone and micro-hardness of the material.
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Šťastný, Jan. "Souvislost vad řezu s řeznými parametry při laserovém řezání." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230119.

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The project in first part deals with theoretical analysis of technological possibilities of method of dividing materials with laser, principal and function of laser, division of different types of lasers, properties of laser ray, laser cutting, cut defects etc. Experimental part is focused on analysis of used machines and equipment, finding of optimal cutting parameters during laser cutting, evaluation of samples and then analysis of problem with generation of step changes and analysis of other possibilities for optimizing of the cut.
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Ben, Jdidia Anoire. "Nouvelle méthode de génération de gammes de fabrication prenant en compte des paramètres économiques et environnementaux." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC028/document.

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Dans l’industrie manufacturière, la consommation d’énergie électrique est considérée comme l'un des problèmes majeurs qui est malheureusement liée systématiquement à l'émission de gaz contenant du dioxyde de carbone et amenant à l’effet de serre. Des études sur l’estimation de l’énergie électrique consommée par les machines outils sont développées par des chercheurs au cours des dernières décennie pour proposer des modèles d’estimation de cette énergie. Ces modèles sont soit empiriques soit théoriques et se limitent à tenir compte du comportement dynamique du système de coupe lors des opérations d’usinage. La contribution fondamentale de cette thèse de doctorat est la caractérisation du comportement non linéaire des efforts de coupe et du système de guidage lors de l’estimation de l’énergie consommée par une machine outil. La modélisation repose sur la détermination de l’effort de coupe et de l’effort des roulements qui sont variables en fonction du temps et qui sont déduites de l’écriture de l’équation de mouvement du système (broche ou machine-outil)discrétisé en éléments finis en utilisant la méthode de Newark couplée avec l’algorithme de Newton Raphson. Ces efforts de coupe et de roulements sont utilisés pour calculer la puissance puis l’énergie consommée par la table d’avance, la broche et par conséquent la machine outil. Afin de valider notre approche, la puissance et l’énergie obtenues à partir du modèle développé sont comparées avec la puissance et l’énergie obtenues avec un dispositif expérimental. Une étude paramétrique est réalisée pour mettre l’accent sur l’impact de la variation des paramètres de coupe sur la valeur de la puissance et de l’énergie consommées. On introduit par la suite des défauts d’usure et de montage au niveau des roulements et nous présentons leurs impacts sur le comportement énergétique de la machine. Une attention particulière a également été consacrée à développer un modèle d’optimisation des mouvement d’une machine outil globale minimisant à la fois l’énergie consommée, le temps de production, le coût et la rugosité de surface en respectant les consignes technologiques
In manufacturing, the electrical energy consumption is considered as one of the major problems which are systematically related to the gas emission containing carbon dioxide and leading to the greenhouse effect. Studies based on the estimation of the machine tools energy consumption become the interest of researchers in recent decades.As a result, different models for energy estimating are developed in order to minimize the quantity of consumed energy. These models are either empirical or theoretical and are limited to taking into account the dynamic behavior of the cutting system during machining operations. The fundamental contribution of this doctoral thesis is the characterization of the nonlinear behavior of cutting and rolling forces during estimating the consumed energy by a machine tool. The developed approach is based on the determination of the variable cutting forces and bearings forces which are function of time. These forces are deduced by solving the equation of motion based on finite element method using Newark's method coupled with Newton Raphson's algorithm. These forces are used to calculate the power then the consumed energy by the axis feed, the spindle and therefore the machine tool. In order to validate our approach, the power and energy obtained from the model developed are compared with the power and energy obtained with an experimental device. A parametric study is carried out to focus on the impact of the variation of the cutting parameters on the value of the consumed power and energy. An interest is given for different types of defect (innerring spalling, outer ring spalling, eccentricity and unbalance) in order to study their impact on the spindle consumed power during approach and cutting phases under different rotating conditions. Particular attention has also been devoted to develop a global model for optimizing machine too lmovements that minimizes the consumed energy, the production time, the cost and the surface roughness with respect of the technological constraints
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Ekström, Emanuel. "Impact of Milling and Sintering on Growth of WC Grains in Liquid Co - and an evaluation of existing growth theories." Thesis, KTH, Materials Science and Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4591.

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Cemented carbides (WC-Co) are powder metallurgical products produced by liquid phase sintering. WC-Co is widely used for making a large variety of cutting tools, such as drills and inserts turning applications, due to its great mechanical properties, where the hardness of the WC grains is combined with the toughness of the of the Co binder. WC grain size and grain size distribution are the two most important factors to control the mechanical properties of the products.

This study examined the grain growth dependence of different milling and sintering times. The resulting grain size and grain size distribution were measured using image analysis on scanning electron microscopy images (SEM) and by using electron backscatter diffraction (EBSD). In addition, the correlation between hardness and coercivity, the most common indirect measures of grain size, and different methods of calculating average grain radius were investigated. An attempt was also made to study the contribution of defects to grain growth. This work also includes an overview of various grain growth equations and a numerical implementation of these.

Experimental results show that for shorter sintering times, powders milled for short times (15 min and 1 h) have larger average grain radii. There is a crossover after 6 to 8 h of sintering, where the powders milled for a long time (40 h and 200 h), have larger average radii. The measured hardness values correlate well with the average grain radius calculated from the grain surface area and the coercivity correlates with the established equations. EBSD measurements detected boundaries that could not be detected by image analysis, and that were not Sigma 2 boundaries. It is likely that these boundaries are either low energy boundaries or boundaries between grains that are very closely oriented. Comparing heat-treated powder with the untreated resulted in a lower average grain size after sintering for the heat-treated powder. None of the growth equations investigated in this work could fully describe the experimental grain growth.

Through increased understanding of the grain growth, the growth can be controlled and the end product can have the desired tool properties. The occurrence of abnormal grains in cutting tool applications can cause breakage, which is especially important to avoid in applications such as PCB drills. A correlation between hardness and grain size provides further means for cheap and fast indirect measures of the grain size in production.


Hårdmetall är ett pulvermetallurgiskt material som tillverkas genom smältfassintring och som kännetecknas av hårdhet, styvhet och god slitstyrka. Volframkarbidens (WC) kornstorlek och kornstorleksfördelning är två viktiga faktorer för att kontrollera de mekaniska egenskaperna i hårdmetall.

I den här studien har korntillväxtens beroende på malning och sintring undersökts. WC-Co maldes och sintrades fyra olika tider och kornstorleksfördelningen mättes med bildanalys på svepelektronmikroskopbilder samt med ``electron backscatter diffraction'' (EBSD). I arbetet har även korrelationen mellan hårdhet, koercivitet och olika sätt att beräkna medelkornstorleken undersökts. Ett försök har också genomförts för att studera hur defekterna i det malda pulvret påverkar korntillväxten. I arbetet har även ett flertal olika tillväxtekvationer modellerats numeriskt och för och nackdelar med de olika tillväxtekvationerna har vägts mot varandra.

En lång maltid (40 h och 200 h) visade sig ge liten kornstorlek för sintring kortare än 6 h, men för sintringar längre än 8 h gav istället kort malning (15 min och 1 h) den mindre kornstorleken. Det visade sig att uppmätt hårdhet korrelerar bäst med den medelkornstorleksradie som räknats fram från kornytan. I EBSD mätningarna kunde man observera ett flertal korngränser, utöver Sigma 2 korngränser, som inte hade detekterats med bildanalys. Värmebehandlingen av det malda pulvret minskade korntillväxten under efterföljande sintring. Ingen av de undersökta tillväxtekvationerna kunde beskriva de experimentella resultaten fullt ut.

Genom ökad förståelse för korntillväxt kan man kontrollera tillväxten och slutprodukten kan få önskade egenskaper. Förekomsten av abnorm korntillväxt i skärverktyg i hårdmetall är en av de vanligaste kritiska defekterna och det är speciellt viktigt är undvika korntillväxt i tillverkning av små verktyg, som till exempel kretskortsborrar. Hårdhet och koercivitet är de vanligaste indirekta mätmetoderna för att mäta kornstorlek i produktion. En bra korrelation mellan kornstorlek och indirekta mätmetoder ger utökade verktyg för snabba och billiga mätningar.

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Dalgleish, Gordon Fraser. "A study of laser-based scanning techniques for defect recognition in sintered cutting tool inserts." Thesis, University of Hull, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389285.

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Dazelle, Jean-Pierre. "Contribution a la conception d'un systeme de vision pour le controle de materiaux continus en defilement : application a l'optimisation de la decoupe en temps reel de bandes de bois contenant des defauts." Caen, 1987. http://www.theses.fr/1987CAEN2034.

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Les elements a prendre en compte dans la conception d'un dispositif complet permettant de repondre a cette classe d'application sont notamment la presence de defauts de nature, de forme et de taille quelconques, et la position aleatoire de ces defauts. Etude et conception d'outils permettant de traiter les defauts d'absence de matiere a partir d'images binaires, et les defauts d'aspect a partir d'images en niveau de gris. Dans les deux cas, le capteur considere est un capteur optique de type lineaire. Mise au point d'un dispositif (materiels et logiciels) repondant au probleme industriel de decoupe en temps reel de bandes de bois contenant des defauts
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Yang, Jiun-Hung, and 楊峻泓. "An Algorithm for Unconstrained Two-dimensional Guillotine Cutting Stock Problem with Defects." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/03562410023292774066.

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碩士
國立中正大學
企業管理所
98
Cutting stock problem is one of the well-known NP-hard problems in operations research. Applications of cutting stock problem can found in various industries, such as paper, metal, steel, and the recent high-tech TFT-LCD industry. Motivated by the cutting of LCD panels from defective glass substrate in the TFT-LCD industry, we propose in this thesis an algorithm for the resulting special two-dimensional cutting stock problem with defects. The proposed algorithm consists of two stages: in the first stage, guillotine cuts are used to cut off the defects; in stage 2, dynamic programming model is applied to find the optimal solutions of the resulting smaller non-defective stock rectangles. A simple example is given to illustrate the proposed algorithm, and a real-size problem in the cutting of LCD panels is solved to show the effectiveness of the algorithm.
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Lima, João Mário Azevedo. "Controlo e gestão da produção no setor de corte térmico." Master's thesis, 2015. http://hdl.handle.net/1822/39506.

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Dissertação de mestrado integrado em Engenharia Mecânica
O presente relatório pretende descrever o projeto realizado no âmbito da Dissertação de mestrado, integrado no 5º ano do Mestrado Integrado em Engenharia Mecânica, da Universidade do Minho. Este trabalho decorre da realização de um estágio curricular, na empresa “O Feliz Metalomecânica S.A” e tem como objetivo, estudar a produção numa indústria de corte a laser e identificar os parâmetros e variáveis adjacentes ao processo, de forma a obter melhorias na qualidade do produto final e consequentemente na produtividade. Para a consecução deste projeto foi necessário definir as diferentes fases da produção, caracterizar os parâmetros da máquina laser, caracterizar a qualidade de superfície de corte, bem como das peças pós corte, relacionar a manutenção da máquina laser com a qualidade das peças, estudar a matéria-prima utilizada na empresa, rever os métodos de inspeção e controlo de qualidade, entre outras etapas que definem o processo de produção. Ainda no capítulo da qualidade, são analisados os instrumentos de medição utilizados na inspeção de peças e os métodos utilizados para o mesmo. É realizado um estudo dos principais defeitos encontrados nas peças pós corte, no qual são apontados os defeitos que ocorrem em maior número, referidas as causas aparentes e sempre que possível a solução adotada. Este estudo poderá permitir uma correção de algumas operações, de forma a evitar a ocorrência dos mesmos defeitos no futuro. Após uma breve introdução é realizado um pequeno estudo sobre o estado da arte, de seguida são apresentados os fundamentos teóricos, o estuda do controlo de qualidade, a gestão da produção e finalmente são referidas as conclusões do trabalho. Durante toda a dissertação, são especificadas as normas internacionais para os diferentes temas abordados.
This report seeks to describe the project carried out in the framework of the Master Thesis, integrated in the 5th year of Integrated Master in Mechanical Engineering, University of Minho. This work follows the completion of a curricular traineeship in the company “O Feliz Metalomecânica S.A" with the objective of studying the production in an industry of laser cutting by identifying the parameters and variables adjacent to the process to obtain improvements in the quality of the final product and consequently on productivity. For the achievement of this project was necessary to define the various stages of production, characterize the laser cutting parameters as well as the quality of the cut surface and the parts after cutting, relate the laser equipment maintenance with the quality of parts, studying the raw material used, to review the methods of inspection and quality control, among other steps that define the production process. In the quality chapter, are analyzed the measuring instruments used in the inspection of parts and the methods used for the same. A study of the main defects found on parts after cutting is performed, in which are pointed out the defects which occur in larger number, the apparent causes and if possible the adopted solution. This study may allow a correction of certain operations in order to avoid the occurrence of the same defects in the future. After a brief introduction on the theme it is performed a brief study on the state of the art, followed by the theoretical foundations, the chapter of quality control, production management and finally are presented the conclusions of the project. During the entire thesis are specified the international standards for the various topics addressed.
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Books on the topic "Cutting defects"

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Crosby, Philip B. Cutting the cost of quality: The defect prevention workbook for managers. [S.l.]: Quality College Bookstore, 1990.

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Chang, Sun Joseph. External and internal defect detection to optimize cutting of hardwood logs and lumber. Beltsville, MD: U.S. Dept. of Agriculture, National Agricultural Library, Technology Tranfer Information Center, 1992.

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Pattison, James. Diplomacy. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198755203.003.0005.

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This chapter considers diplomatic measures, including diplomatic criticism (naming and shaming), dialogue and mediation, the cutting of diplomatic ties, and the denial of membership of an international body. The first part of the chapter focuses on diplomatic criticism, arguing that it can help to address the situation, contribute to morally valuable international norms, and even punish offenders. In doing so, it considers the objection that diplomatic criticism is too demanding and that states are not entitled to criticize others when they are being hypocritical. More broadly, the chapter establishes the moral importance of expressing condemnation and upholding morally valuable international norms. The chapter also generally defends the case for mediation, negotiation, and denial of membership, but rejects the utility of the cutting of diplomatic ties.
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Pandith, Farah. How We Win: How Cutting-Edge Entrepreneurs, Political Visionaries, Enlightened Business Leaders, and Social Media Mavens Can Defeat the Extremist Threat. HarperCollins Publishers, 2020.

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How We Win: How Cutting-Edge Entrepreneurs, Political Visionaries, Enlightened Business Leaders, and Social Media Mavens Can Defeat the Extremist Threat. Custom House, 2019.

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Guzzardi, Sergio. Longevity Diet Cookbook : A Strategy to Defeat Aging: From Diet to Cutting-Edge Science to Make You Look Good and Live Longer. Independently Published, 2019.

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Wilson, Alastair. The Nature of Contingency. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198846215.001.0001.

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Contingency is everywhere, but what is it? This book defends a radical new theory of contingency as a physical phenomenon. Drawing on the many-worlds approach to quantum theory and on cutting-edge metaphysics and philosophy of science, it argues that quantum theories are best understood as telling us about the space of genuine possibilities rather than as telling us solely about actuality. When quantum physics is taken seriously in the way first proposed by Hugh Everett III, it provides the resources for a new systematic metaphysical framework encompassing possibility, necessity, actuality, chance, counterfactuals, and a host of related modal notions. The framework is a modal realist one, in the tradition of David Lewis: all genuine possibilities are on a par, and the actual world is simply the one that we ourselves inhabit. It departs from Lewisian modal realism in that quantum possible worlds are not philosophical posits but scientific discoveries. Contingency and other modal notions have often been seen as beyond the limits of science. Rationalist metaphysicians argue that the metaphysics of modality is strictly prior to any scientific investigation: metaphysics establishes which worlds are possible, and physics merely checks which of these worlds is actual. Naturalistic metaphysicians respond that science may discover new possibilities and new impossibilities. This book’s quantum theory of contingency takes naturalistic metaphysics one step further, allowing that science may discover what it is to be possible. As electromagnetism revealed the nature of light, as acoustics revealed the nature of sound, as statistical mechanics revealed the nature of heat, so quantum physics reveals the nature of contingency.
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Book chapters on the topic "Cutting defects"

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Mirastschijski, Ursula. "Genital Scars." In Textbook on Scar Management, 405–25. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44766-3_47.

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AbstractGenital scarring is a topic rarely addressed and discussed in public. Scarring can occur after trauma, female genital mutilation/cutting, circumcision, tumor surgery, burns, infections, or local skin diseases, for example, lichen sclerosus et atrophicus. Genital skin anatomy and wound healing differ from other regions of the body. This chapter focuses on genital skin anatomy, the physiology of normal genital wound healing, the pathophysiology of genital scarring, and the current state-of-the-art for plastic surgical treatment of genital tissue defects and scars.
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Zhao, Yan Ling, Xian Li Liu, Peng Wang, and Hai Yang Wang. "Application of Artificial Neural Net in Defect Image Recognizing of Cutting Chip." In Advances in Machining & Manufacturing Technology VIII, 496–500. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-999-7.496.

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Neidlein, Vera, Andréa C. G. Vianna, Marcos N. Arenales, and Gerhard Wäscher. "Two-Dimensional Guillotineable-Layout Cutting Problems with a Single Defect - An AND/OR-Graph Approach." In Operations Research Proceedings 2008, 85–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00142-0_14.

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Priebe, Sebastian, Lukas Brackmann, Ahmad Alabd-Allah, Sahir Butt, Arne Röttger, Günther Meschke, and Inka Mueller. "Comparison of Hilbert Transform and Complex Demodulation for Defect Identification in Cutting Discs using Vibration-Based Feature Extraction." In Lecture Notes in Civil Engineering, 564–72. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64594-6_55.

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GHOSH, S. K., J. E. BEITIALARRANGOITIA, and G. E. GARCIA DE VICUNA. "Some Physical Defects Arising in Laser, Plasma and Water Jet Cutting." In Studies in Applied Mechanics, 133–59. Elsevier, 1987. http://dx.doi.org/10.1016/b978-0-444-42859-2.50020-x.

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Berger, Dominik, and Roland Fuerbacher. "Development of Measurement Technique for Cutting Edge Defects in Fiber Reinforced Plastics." In DAAAM Proceedings, 1421–22. DAAAM International Vienna, 2011. http://dx.doi.org/10.2507/22nd.daaam.proceedings.695.

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Chen, Shihheng, Hung-Chi Chen, and Yueh-Bih Tang. "Finesse in Damage Control Reconstruction for Trauma in Plastic Surgery." In Trauma and Emergency Surgery - The Role of Damage Control Surgery. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.92975.

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Reconstructions of body, extremity and facial resurfacing facial defects are common encounters in plastic surgery. It may be owing to trauma, burn injury, tumor, congenital anomalies, miscellaneous kinds of malignancies. The face has its specific landmarks: the forehead, eyebrows, eyes with upper and lower eyelids, orbit, midface (nose, maxilla, zygoma), upper lip, cheeks, nasolabial folds, lower face (lower lip, mandible with angle), oral mucosa (buccal mucosa, upper lip sulcus, lower lip sulcus), mentum, and neck. Anatomical landmarks include forehead, eyebrow, and eyelids: upper/lower, orbit, midface: nose, maxilla, upper lip, nasolabial folds, and zygoma. Lower face: lower lip, mandible, oral mucosa, buccal mucosa, upper lip sulcus, lower lip sulcus. Strategic approaches include the following: tissue expansion, resection of tumor, and repair with resurfacing, repair of multilayer defect repair for functional purpose. Reconstruction for trauma is commonly encountered in the daily practice in plastic surgery. The trauma may be caused by miscellaneous causes, including traffic accident, fall, cutting, avulsion, contusion, electrical injuries, irradiation injuries, chemical injuries, etc., resulting in disfigurement, deformity and functional disabilities. The strategic approach is to achieve anatomical restoration, functional rehabilitation and aesthetic refinements for the afflicted individuals. Pursuing excellence in plastic surgery, bringing excellence to life is always the ultimate goal for plastic surgeons.
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Fogel, Mark A. "Novel CMR techniques for advanced surgical planning." In The EACVI Textbook of Cardiovascular Magnetic Resonance, edited by Massimo Lombardi, Sven Plein, Steffen Petersen, Chiara Bucciarelli-Ducci, Emanuela R. Valsangiacomo Buechel, Cristina Basso, and Victor Ferrari, 502–8. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198779735.003.0049.

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Medical and surgical care for the patient with congenital heart disease (CHD) has advanced greatly over the past 40 years; along with improved surgical and catheter-based techniques, intensive unit care, and overall medical advances, improved outcomes have accrued across a whole host of cardiac defects. This is owed, in no small part, to advances in imaging and cardiovascular magnetic resonance (CMR) which has played an important and growing role in this evolution. Novel CMR techniques 25 years ago, such as gadolinium-based imaging and two-dimensional velocity mapping, are now commonplace. At the cutting edge of novel CMR techniques, in the current era, are computational fluid dynamic modelling, three-dimensional printing, four-dimensional flow imaging, and X-ray magnetic resonance/interventional CMR, which will be the focus of this chapter. The hope is that one day these techniques will be the commonplace ones, aiding in the care of a broad spectrum of CHD.
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Ferriday, Ursula T., and I. S. Foulds. "Dermatological disorders." In Fitness for Work, 454–62. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199643240.003.0022.

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The skin acts as a protective barrier against a number of hazards within our environment. These hazards can be: chemical, e.g. acids, alkalis, solvents, cutting, or soluble oils; biological, e.g. bacteria, plant allergens, or raw food; or physical, e.g. ultraviolet light, or mechanical shearing forces. In some situations the defensive properties of the skin are exceeded resulting in cuts, grazes, inflammation, ulceration, infection, and occasionally malignant change. The risk factors for breakdown of skin defences can be categorized as: (i) occupational—common at-risk groups are cleaners, food handlers, hairdressers, and workers in contact with cutting fluids; and (ii) non-occupational—where genetic predisposition to skin disorders is an important factor. Workers with non-occupational skin disorders can suffer exacerbations of their underlying dermatological condition in workplaces where the environment is hot and humid or extremely cold or dry.
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Crotty, Martin, Neil J. Diamant, and Mark Edele. "Introduction." In The Politics of Veteran Benefits in the Twentieth Century, 1–13. Cornell University Press, 2020. http://dx.doi.org/10.7591/cornell/9781501751639.003.0001.

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This chapter explains the wide variation in postwar outcomes for veterans. It discusses the conditions that veterans emerge from the largest wars in the twentieth century with significant material recompense and higher status than their civilian counterparts. It also surveys the broad landscape of military engagements in the twentieth century, such as soldiers in cutting-edge fighter aircraft at thirty thousand feet, in submarines, in tanks, and armored personnel carriers. The chapter describes wartime services that are varied as soldiers that served from the commencement of hostilities to victory or defeat. It examines individual biographies of veterans across all combatant nations while multiplying the meanings of the word veteran in the process.
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Conference papers on the topic "Cutting defects"

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Wu, Keqiang, Xiaoping Min, and Defu Zhang. "Research on Two-dimensional Cutting Problem with Defects." In 2019 IEEE 10th International Conference on Software Engineering and Service Science (ICSESS). IEEE, 2019. http://dx.doi.org/10.1109/icsess47205.2019.9040847.

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Schuöcker, Dieter, and Georg Schuöcker. "Dynamic phenomena and quality defects in laser cutting." In INTERNATIONAL SYMPOSIUM ON HIGH POWER LASER ABLATION 2012. American Institute of Physics, 2012. http://dx.doi.org/10.1063/1.4739885.

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Durak, B., and D. Tuzun Aksu. "A genetic algorithm based solution for the online cutting problem with defects." In 2015 IEEE International Conference on Industrial Engineering and Engineering Management (IEEM). IEEE, 2015. http://dx.doi.org/10.1109/ieem.2015.7385959.

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Kurganova, I. N., and A. F. Zayets. "Restoring the Supporting Capacity of Compressor Station (CS)’s Framework With Pipe Surface Defects." In 1996 1st International Pipeline Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/ipc1996-1866.

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In the technologic pipeline framing of CS shop there are revealed defect sections which emerging is caused by tearing-out of pipeline support channels in their places of welding to supports. Because of it there emerged defects like cavities, fissures Russian CS pipelines are related to highly dangerous ones and there are no regulative materials for exploitation of such systems with defects. But removing of all defect places in this binding equals to its disassemblying and building of new one, this is existing defects. With this aim there are conducted complex surveys and developed repair method, considerably increasing capacity of technologic framing without cutting of defect places. Complex measures include long-term nature measurings of stress-strain state in vicinities of defects; cyclic longevity (remaining capacity) tests of soil with defects cut from operating framework; calculation-theoretical developments patent workings-up, creation of new repair method and its approbation in CS conditions. As results of nature and cyclic tests there are gotten factual value of stress polus on pipe and remaining capacity data. On basis of gotten results there are made static calculations on crack-resisting and load-bearing capacity of designs with defects and dynamic calculation for remaining capacity. There is developed repair method of pipeline binding, preconcerted with exploitation situation and allowing to lift framing’s reliability level up to project one.
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Chao, Zeng, Wang Chunqing, Tian Yanhong, Liu Wei, An Rong, and Hang Chunjing. "Characterization of the hot-cutting defects produced by the processing of alumina green tape." In High Density Packaging (ICEPT-HDP). IEEE, 2011. http://dx.doi.org/10.1109/icept.2011.6066990.

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Liu, Joshua, Jerry Fang, Ryan J. Murphy, Chad Gordon, and Mehran Armand. "Design and Development of 5-Axis Cranial Implant Laser Cutting System." In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-68064.

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Cranioplasty is a procedure for skull reconstruction after removal of bone defects such as tumors. Recent approaches for cranioplasty involve the use of customized cranial implants (CCIs). A challenge in performing the cranioplasty with CCI is that the actual size/shape is unknown until the tumor is removed. Often the procedure is performed in two stages. After removing the cranial defect, the surgeon works with an implant manufacturer to develop a CCI using computer-aided design and manufacturing (CAD/CAM) techniques. The CCI attachment to the skull will then require a second surgery. We recently proposed a robot-assisted single-stage cranioplasty. For conventional, single-stage CCI, the CCIs are usually made in oversized profiles and require manual intraoperative modification by the surgeon. The challenge, however, is that for complex cases the surgeon may spend a long time reshaping the CCI. This paper presents the development of a 5-axis laser cutting machine that has the capability of automatically shaping CCI profiles during single-stage cranioplasty. Preliminary results indicate a superior fit with only mm size gaps between the implant and the remaining skull.
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Monzon, Javier, Rony Cueva, Manuel Tupia, and Mariuxi Bruzza. "A Cuckoo Search Algorithm for 2D-cutting Problem in Decorative Ceramic Production Lines with Defects." In 11th International Conference on Agents and Artificial Intelligence. SCITEPRESS - Science and Technology Publications, 2019. http://dx.doi.org/10.5220/0007346705470553.

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Hou, Ning, Yong Zhang, Liangchi Zhang, Kausala Mylvaganam, Junqi Wei, and Feihu Zhang. "An investigation on the surface/subsurface defects in potassium dihydrogen phosphate crystals after fly-cutting." In Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016), edited by Wenhan Jiang, Li Yang, Oltmann Riemer, Shengyi Li, and Yongjian Wan. SPIE, 2016. http://dx.doi.org/10.1117/12.2243806.

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Pahuja, Rishi, M. Ramulu, and M. Hashish. "Abrasive Waterjet Profile Cutting of Thick Titanium/Graphite Fiber Metal Laminate." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67136.

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Fiber Metal Laminates (FML) are one of the most advanced engineered materials used in aerospace industry. The combination of metallic sheets interspersed in composite laminates in one hybrid material system provides higher impact and corrosion resistance when compared with their monolithic counterparts. However, due to the difference in machining responses for different material phases, conventional machining often induce damages and defects, affecting the cost and structural performance of the part. This research study investigates the machinability of thermoplastic Titanium Graphite (TiGr) FML. The feasibility and machinability of contouring thick (7.6 mm–10.5 mm) TiGr through Abrasive Waterjet (AWJ) process was studied in terms of machined kerf characteristics — taper ratio and surface quality. The effect of a wide range of process parameters was investigated such as geometric variables (mixing tube aspect ratio and orifice bore size), kinetic variables (water pressure, jet traverse speed) and abrasive load ratio on the machining quality. Predictive mathematical regression models were developed through Analysis of Variance (ANOVA) in order to optimize the process. Alongside, machined surface was examined to inspect the topological characteristics, material removal mechanism, and machining induced damage (micro-defects) and distortion through Surface Profilometry, Scanning electron and optical microscopy. A comparison was drawn between conventional and AWJ trimming of TiGr to demonstrate the superiority and high speed machining of AWJ with less damage.
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Fu, Xingyu, Kyeongeun Song, Dongmin Kim, Gyuho Kim, Byung-Kwon Min, and Martin Byung-Guk Jun. "Micro-Scale Fiber Cutting Geometry Predictions During Milling of Carbon Fiber Reinforced Polymers (CFRP) Composites." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2900.

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Abstract Carbon Fiber Reinforced Polymer (CFRP) is a light-weight material with high strength and highly corrosion resistance, and hence is widely applied in aerospace industries. However, milling of CFRP usually generates machining defects (for instance, delamination and pull-out fibres), making processed surface unqualified to meet the requirement of aerospace application. Therefore, prediction for machining quality should be conducted before milling processing to avoid potential loss in massive production. Fracture behaviours of micro-scale fibres and matrix have a significant influence on the final machined surface, and such material removal mechanism can be mainly determined by micro-scale geometrical relationships between carbon fibers and milling teeth. In this paper, a micro-scale geometrical calculation software for CFRP milling is provided based on Dexel model. The software can generate geometrical parameters, for example, cutting angle, cutting length and engagement angle, for the whole milling process. Milling defects and milling forces can be conducted based on those micro-scale geometrical parameters.
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