Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2006. / Includes bibliographical references (leaves 83-89). Also available in electronic version.

Thesis (Ph. D.)--City University of Hong Kong, 2005. / "Submitted to Department of Manufacturing Engineering and Engineering Management in partial fulfillment of the requirements for the degree of Doctor of Philosophy." Includes bibliographical references (leaves 164-175).

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Florianópolis, 1989. / Made available in DSpace on 2013-12-05T20:04:23Z (GMT). No. of bitstreams: 1 79635.pdf: 8397322 bytes, checksum: 74de2feee7922e6efd0b29ea6856aab9 (MD5) Previous issue date: 1989 / O presente trabalho descreve o desenvolvimento de um sistema gráfico interativo para a elaboração de desenhos e programas de comando numérico, visando dar apoio ao projeto e a fabricação de matrizes para solados planos injetados, com auxílio de estações gráficas e máquinas de comando numérico (CNC). O referido sistema é composto de módulos que foram desenvolvidos para ajuste de curvas, escalonamento automático dos vários números de um modelo e geração automática de curvas eqüidistantes. Esses módulos, juntamente com a implementação de primitivas geométricas, arquivo gráfico e um ambiente gráfico interativo, assistem ao usuário na criação das diferentes geometrias, que apresentam trajetórias de ferramentas no momento da usinagem. Adicionalmente é apresentado um processador que traduz a geometria criada e os dados tecnológicos introduzidos, para o programa de comando numérico. Finalmente são analisados os resultados no projeto e da usinagem de uma matriz protótipo, que foi totalmente planejada e executada pelo sistema desenvolvido.

An arbitrary continuous system model can be constructed on a Graphic Display by interacting with a light pen and dials. The user is presented with a control language and a menu on the Graphic Display, which uses pre-defined symbols to design a Continuous System Model. After constructing the model he wants to simulate, the user can assign appropriate variable names and values to the symbols, direct flow of information or material between components, can assign mathematical relationships between the components of a model, and can sketch graphical functions (x-y relationships) on the Graphic Display with the help of cross-hairs. The model, when built, can be saved on disk. In order to make modifications to the model at later time, a previously saved model can be restored. Changes such as altering values, mathematical relationships, and the deletion or addition cf components can be made before rerunning a simulation. Once the user is satisfied with the model description phase and when his model is complete, a CSBP program for that model is written onto disk, which can then be compiled and run in order to obtain the results for the specified variables in tabulated form. As visual aids, plots against Time can also be observed on the Graphic Display or can be plotted cn an X-Y plotter. The CAB system presented here provides an interactive tool for the design, modification and experimentation with Continuous System Models. As such it can enhance the modeller's representation and understanding of reality. / Science, Faculty of / Computer Science, Department of / Graduate

Orientador : Manuel de Jesus Mendes / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Campinas / Made available in DSpace on 2018-07-15T13:30:53Z (GMT). No. of bitstreams: 1 Tozzi_ClesioLuis_D.pdf: 2880248 bytes, checksum: 4e6d33c3da27b0b41911857f8b6897d3 (MD5) Previous issue date: 1979 / Resumo: O trabalho trata do desenvolvimento de um terminal gráfico interativo baseado na tecnologia do 'TV Raster', com estrutura dinâmica da 'picture memory' e conversão em tempo real do 'display file', possibilitando a rápida atualização da imagem, requisito necessário às aplicações interativas como: controle de processos, CAD, etc / Abstract: Not informed / Doutorado / Doutor em Engenharia Elétrica

The diploma thesis deals with technological preparation of the production at a CNC machining center, equipped with FANUC control system. In cooperation with company AB KOMPONENTY s.r.o. has been used CAM software GibbsCAM and its extensions VoluMill. The first chapter is devoted to the basic properties of aluminum, aluminum alloys and their using in the industry. Furthermore, the chip foramtion in milling is analysed. The following is an analysis of trochoidal milling and research of CAM systems VoluMill and iMachining - systems based on a medium thickness of chip in rough milling opeartions. Next part deals with the design production process of the selected component, the choice of the blank and the processing of the control program with the VoluMill method for this component. The last chapter of the thesis is focused on the techno-economic evaluation for a given number of pieces and individual production technology.

Book Summary: The New Edition provides the latest, essential information on the symptoms, diseases, treatments, and procedures most commonly encountered in everyday practice. It features step-by-step clinical guidance for more than 320 common diseases and disorders, as well as explicit guidelines for over 60 office procedures. An organ-system organization, extensive alphabetical index, and cross references within the individual chapters make the information easy to find.

OBJECTIVES: To evaluate the mechanical and physical properties of three glass-ceramic CAD/CAM systems; Vita Suprinity PC (Vita ZahnFabrik), Cerrec Tessera (Dentsply-Sirona), and IPS e.max CAD (Ivoclar Vivadent). MATERIALS AND METHODS: For each material, CAD/CAM blocks were sectioned into a total of N=108 (n=12 per group) test discs with a diameter of 11.3 mm core drill and used the precision saw machine. Specimens were divided into three groups (1) glaze control, (2) polish only, and (3) ground after manufacturer glaze. Specimens were randomly assigned for the biaxial flexural strength test then each group was tested under three conditions post-treatment: (1) static, (2) thermal cycling for 5000 cycles, and (3) cyclic loading at 200,000 cycles. The biaxial flexural strength test was preformed according to ISO 6872-2015 using an Instron universal testing machine. Thermal artificial aging cycling was from 5° to 55°C, while fatigue was used for about 20% of the static failure load for 200,000 cycles. Vickers indentation was performed to test microhardness and fracture toughness. Also, surface roughness was measured for each group using a stylus contact profilometer. Additionally, surface topography and crystal microstructure analysis by SEM and crystallographic structural analysis by X-ray diffraction were done. Data were analyzed using one-way ANOVA test or least square regression (α = 0.05) and the post hoc Tukey HSD test. RESULTS: Significant differences were observed in the mean of biaxial flexural strength between the three glass-ceramics materials. The highest mean flexural strength for static was IPS e.max CAD 385.91 ± 46.23 MPa, then Vita Suprinity PC glazed 355.72 ± 72.44 MPa, followed by CEREC Tessera glazed 323.40 ± 61.01 MPa. After thermal cycling and fatiguing, there were no significant effects in flexural strength for CEREC Tessera; however, there was an increase in flexural strength for IPS e.max CAD and Vita Suprinity PC. Vickers Hardness was highest for CEREC Tessera with 7.19 ± 0.47 GPa, then Vita Suprinity PC at 7.05 ± 0.73 GPa, followed by IPS e.max CAD 5.79 ± 0.77 GPa. The fracture toughness for IPS e.max CAD was the highest with 1.97 ± 0.12 MPa.m1/2, CEREC Tessera 0.93 ± 0.05 MPa.m1/2, and Vita Suprinity PC 0.85 ± 0.08 MPa.m1/2. CONCLUSIONS: IPS e.max CAD polished outperformed Vita Suprinity PC and CEREC Tessera with respect to flexural strength under different aging conditions. In contrast, Vita Suprinity PC had the highest strength in every aging condition among the glazing group. Clinically Significant: Although all three materials might be suitable for single restorations, caution is needed when choosing material, especially as the rough surface from clinical adjustments may reduce its strength.

O presente trabalho trata do desenvolvimento e análise de uma ferramenta de auxílio à otimização de programas CN com relação aos parâmetros tecnológicos planejados. Os atuais módulos de otimização presentes em sistemas CAM não levam em consideração variáveis relativas ao desempenho da máquina ferramenta e do processo, tais qual a dinâmica e a potência da máquina ferramenta, e a capacidade de processamento do CNC. Tal lacuna de informação pode gerar discrepâncias entre os resultados planejados e a realidade, o que faz com que constantes reajustes do processo baseados na experiência do operador sejam necessários. Nesse trabalho, é proposta e avaliada uma ferramenta de monitoramento de variáveis características da máquina ferramenta, cuja principal função é a previsão do tempo de usinagem na fabricação de superfícies complexas. Uma vantagem adicional do sistema de monitoramento proposto é sua implementação através do próprio controle da máquina ferramenta, em máquinas CNC, caracterizadas como de arquitetura aberta, sem a utilização de sensores externos. / The present work is about development and analysis of a support tool for optimization of NC programs with special regard to planned technological metal cutting parameters. The optimization modules presents in CAM systems do not consider the real performance of the machine-tool. Such an information gap can generate discrepancies between planned results and reality, demanding constant adjustments based on the operator\'s process experience. The present work consists of proposing and evaluating of a monitoring tool of the machine characteristic variables, whose the main function is to predict the machining time in the manufacturing of complex surfaces. As an additional advantage, the monitoring is carried through the machine-tool control, in open-CNC machines, without the use of external sensors.

O presente trabalho trata do desenvolvimento e análise de uma ferramenta de auxílio à otimização de programas CN com relação aos parâmetros tecnológicos planejados. Os atuais módulos de otimização presentes em sistemas CAM não levam em consideração variáveis relativas ao desempenho da máquina ferramenta e do processo, tais qual a dinâmica e a potência da máquina ferramenta, e a capacidade de processamento do CNC. Tal lacuna de informação pode gerar discrepâncias entre os resultados planejados e a realidade, o que faz com que constantes reajustes do processo baseados na experiência do operador sejam necessários. Nesse trabalho, é proposta e avaliada uma ferramenta de monitoramento de variáveis características da máquina ferramenta, cuja principal função é a previsão do tempo de usinagem na fabricação de superfícies complexas. Uma vantagem adicional do sistema de monitoramento proposto é sua implementação através do próprio controle da máquina ferramenta, em máquinas CNC, caracterizadas como de arquitetura aberta, sem a utilização de sensores externos. / The present work is about development and analysis of a support tool for optimization of NC programs with special regard to planned technological metal cutting parameters. The optimization modules presents in CAM systems do not consider the real performance of the machine-tool. Such an information gap can generate discrepancies between planned results and reality, demanding constant adjustments based on the operator\'s process experience. The present work consists of proposing and evaluating of a monitoring tool of the machine characteristic variables, whose the main function is to predict the machining time in the manufacturing of complex surfaces. As an additional advantage, the monitoring is carried through the machine-tool control, in open-CNC machines, without the use of external sensors.