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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
31

Kalibrace optických souřadnicových měřicích strojů GOM ATOS / Calibration of GOM ATOS optical coordinate measuring machines

Košťák, Ondřej January 2017 (has links)
This master’s thesis contains the basic division of 3D methods which are used for reconstruction of measured objects. Furthermore the types of structured light patterns used for 3D triangulation. It also contains a description of the construction and functions of GOM ATOS and TRITOP machines. Primarily the thesis deals with the calibration of these machines, the design of suitable materials standard of size and the internal calibration methodology used by ŠKODA AUTO a.s. The text also includes verification of the proposed calibration procedure in practice, proposal for determination of calibration uncertainties and recommendations for practice.
32

Měřicí stanice v automatické obráběcí lince / Measuring stations in an automatic machining line

Fúsek, Jakub January 2018 (has links)
This master thesis deals with the use of measuring stations in an automatic machining lines. An overview of the methods of measuring engineering products in engineering practice with a focus on automation of measurement is described. The basic principles of function of these machines, their construction and materials are described. The largest part describes coordinate measuring machines, which continue to evolve and offer more and more possibilities for automatic measurement. The practical part is aimed at documenting the sample situation of measurements on this type of equipment and evaluating the possibility of its integration into the automatic machining line.
33

Návrh interní metodiky pro měření výrobků a dílů na přístroji CMM UPMC Zeiss na pracovišti ČMI Brno / Proposal of internal methodology for measurement of products and parts on CMM UPMC Zeiss at CMI Brno

Hájková, Alena January 2020 (has links)
This diploma thesis deals with the proposal of internal methodology for measurement of products and parts on CMM UPMC Zeiss at CMI Brno. The first part of this work analyzes the current state of knowledge in the field of accurate measurement on coordinate measuring machines (CMM), which includes the definition of basic metrological concepts, methodology for determining and expressing uncertainties of measurement and a general description of CMM. The diploma thesis also contains a detailed description of the UPMC 850 CARAT S-ACC device from the company Zeiss and summarizes the requirements for the testing laboratory in accordance with the standard ČSN EN 17 025: 2018. The next part of the work is focused on defining and determining the measurement uncertainties for this CMM and on developing a testing procedure for measurements on this machine. The final part of this thesis summarizes the achieved results and recommendations for practice.
34

METROLOGY AND INSPECTION TECHNIQUES IN MACHINING PROCESSES : A Case Study

Parthan, Ajay, Methiramthottathil Biju, Anandhu January 2024 (has links)
This study project looks at how metrology and inspection methods have advanced inside machining processes to improve production efficiency, accuracy, and precision. The study includes an extensive examination of the literature, observational research, and critical analysis to provide insights into the possibilities, difficulties, and practices that exist in the sector today. The literature review charts the development of metrology from manual measurement techniques to highly automated systems, emphasizing the crucial roles that optical inspection systems and coordinate measuring machines (CMMs) play in contemporary production. Modern inspection technologies, including as non-contact techniques and laser scanning, are also discussed, along with the difficulties in combining metrology data with digital production systems. Observational research offers direct knowledge of how metrology and inspection techniques are used in real-world industrial settings. Alongside difficulties including operator skill levels and equipment calibration, the usage of portable measuring tools, CMMs, and optical inspection systems for assessing surface finish and dimensional correctness is noted. Findings study points to growing problems such the requirement for experienced operators and operational unpredictability in machining processes, as well as the increasing integration of metrology and inspection methods into machining processes. But there are also prospects for development, with an emphasis on the ability to increase efficiency and quality control, via Industry 4.0 projects and additive manufacturing technology. All things considered, this study project clarifies the crucial function metrology and inspection methods play in contemporary manufacturing and provides guidance for enhancing quality assurance and machining process efficiency.
35

A Study of the Selling Strategy of the Metrology-- Case Study of Coordinate Measuring Machine

Chen, Cheng-Tung 16 August 2011 (has links)
ABSTRACT(­^ ¤å ºK ­n) The mother of the industrial machinery industry, often regarded as a national benchmark assessment of industrial competitiveness, the traditional concept of the cutting and forming machine tools for the spindle, including optoelectronics, semiconductors, automobiles, 3C electronics and aerospace industries, the relevant production or processing equipment, all belong to this category. With the evolution of technology, increasingly stringent product quality requirements, such as the appearance of the size of the high precision requirements and the material surface, gradually the importance of testing equipment and manufacturing go hand in hand, on behalf of the state's technology industry is expected in the near The future will be an important assessment of industrial competitiveness indicators. On the other hand, the mainland market after ten years of cross-strait exchange, itself played a significant change, from the early to the extreme dependence on imported equipment to produce the world-famous cottage products, no matter how the people of Taiwan to the mainland products exclusion, in the free under the natural law of market competition, the consumer market in Taiwan has long been filled with many mainland-made products. Their number and variety of the broad, deep penetration, simply makes hard to detect, and many exclusive products in the mainland business executives, the factory uses a lot of their own system of equipment are still unaware of the mainland, and even know, but also not find to alternative products. Indeed, many products have to meet the continent needs, these needs is not only reflected in the consumer goods market, is also rapidly spreading to the industrial market. Most of the countries with advanced manufacturing technology in the world, more or less with metrology industry. Taiwan alone will not only have no metrology manufacturing base, and even the Taiwan metrology companies in , mainland China, the increasing decline in ability to survive, the market that introduced by the Taiwan factories in the past swallowed gradually and easily by the local vendors. Worry about the future of Taiwan metrology industry. If Taiwan metrology industry can not get a good position in the world, can we be famous just by create a brand? Case is a company with more than 30 years of metrology sales background, in southern Taiwan. Because the relatively small market, it is difficult to obtain the dominant position of advantage. However, with the rise in the mainland market, the case company is full of many opportunities. This paper will research the sale strategy during these changeable situations. Bisides, metrology includes wide range products, this paper choose Coordinate Measuring Machines (CMM) as the basis of the primary products, mainly because of higher prices, the level of broader considerations in business, relatively high barriers to entry, in addition, it also has many features quite representative of the industry's products. Key words: Metrology, Coordinate Measuring Machines, CMM, hardness, surface roughness measuring instrument, roundness measuring instrument, the contour profile instrument, caliper, height gauge, optical flatness gauge, indicating scale, micrometer , microscopes , projectors , block gauge
36

Methods for 3D Structured Light Sensor Calibration and GPU Accelerated Colormap

Kurella, Venu January 2018 (has links)
In manufacturing, metrological inspection is a time-consuming process. The higher the required precision in inspection, the longer the inspection time. This is due to both slow devices that collect measurement data and slow computational methods that process the data. The goal of this work is to propose methods to speed up some of these processes. Conventional measurement devices like Coordinate Measuring Machines (CMMs) have high precision but low measurement speed while new digitizer technologies have high speed but low precision. Using these devices in synergy gives a significant improvement in the measurement speed without loss of precision. The method of synergistic integration of an advanced digitizer with a CMM is discussed. Computational aspects of the inspection process are addressed next. Once a part is measured, measurement data is compared against its model to check for tolerances. This comparison is a time-consuming process on conventional CPUs. We developed and benchmarked some GPU accelerations. Finally, naive data fitting methods can produce misleading results in cases with non-uniform data. Weighted total least-squares methods can compensate for non-uniformity. We show how they can be accelerated with GPUs, using plane fitting as an example. / Thesis / Doctor of Philosophy (PhD)

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