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21	Study of fixturing accessibilities in computer-aided fixture design Ghatpande, Puja Sudhakar. January 2008 (has links) Thesis (M.S.)--Worcester Polytechnic Institute. / Keywords: Accessibility; CAM; CAD; Integration; Fixture Design. Includes bibliographical references (leaves 108-109).gh
22	CAFixD: A Case-based Reasoning Method for Fixture Design Boyle, Iain Mackinnon 04 May 2006 (has links) Fixtures accurately locate and secure a part during machining operations such that the part can be manufactured to design specifications. To reduce the design costs associated with fixturing, various computer-aided fixture design (CAFD) methods have been developed through the years to assist the fixture designer. Much research has been directed towards developing systems that determine an optimal fixture plan layout, but there is still a need to develop a CAFD method that can continue to assist designers at the unit level where the key task is identifying the appropriate structure that the individual units comprising a fixture should take. This research work details the development of a CAFD methodology (called CAFixD) that seeks to fill this hole in the CAFD field. The approach taken is to consider all operational requirements of a fixture problem, and use them to guide the design of a fixture at the unit level. Based upon a case-based reasoning (CBR) methodology where relevant design experience is retrieved and adapted to provide a new fixture design solution, the CAFixD methodology adopts a rigorous approach to indexing design cases in which axiomatic design functional requirement decomposition is adopted. Thus, the design requirement is decomposed in terms of functional requirements, physical solutions are retrieved and adapted for each individual requirement, and the design re-constituted to form a complete fixture design. Case adaptation knowledge is used to guide the retrieval process. Possible adaptation strategies for modifying candidate cases are identified and then evaluated. Case and adaptation strategy combinations that result in adapted designs that best satisfy the preferences of the designer are used as the final design solutions. Possible means of refining the effectiveness of the method include combining adaptation strategies and considering the order in which design decisions are taken. axiomatic design case-based reasoning fixture design retrieval-by-adaptabilty Jigs and fixtures Design CAD/CAM systems Case-based reasoning
23	Untersuchungen von Setzvorgängen zur Auslegung von Durchsetzmaschinen im Feinkornbereich Ojeda Laura, Rilmar Abel 20 February 2018 (has links) (PDF) Die Analyse des gegenwärtigen Wissenstands zu den Setzmaschinen zeigt, dass sie vornehmlich empirisch auf der Grundlage von Betriebserfahrungen und Versuchen dimensioniert werden. Die Hauptursache ist die mangelnde mathematisch-physikalische Durchdringung des Setzprozesses. Insbesondere im Feinkornbereich besteht sowohl bei der mathematisch-physikalischen Modellbildung, als auch für den Bereich systematischer experimenteller Untersuchungen Forschungsbedarf. Das Ziel dieser Arbeit war die Entwicklung eines Auslegungsmodells speziell für Durchsetzmaschinen. Ausgangspunkt für die Entwicklung des Modells war die Erarbeitung einer Systematik unter Berücksichtigung der für den Durchsetzprozess relevanten Einfluss- und Zielgrößen. Die Ergebnisse der durchgeführten experimentellen Untersuchungen relevanter Einflussgrößen dienten zur Validierung der Ergebnisse des zu entwickelnden Modells. Setzmaschinen Setzvorgänge Feinkornbereich Jigs jigging process fine particle range ddc:620 Setzmaschine <Aufbereitung> Absetzen Feinkorn Prozessanalyse
24	Sensor Based Fixture Design and Verification Purushothaman, Radhakrishnan 21 January 2003 (has links) The objectives of Sensor Based Fixture Design and Verification (SFDV) research are to provide the means for detecting contact failure of the workpiece with fixture locators and for preventing incorrect loading of the workpiece in a fixture. The fixtures that involve complex free-form surfaces especially in the aerospace industries face problems caused by the contact failure of the workpiece with locators. In batch and mass production defects often occur due to incorrect loading of the workpiece in a fixture by an operator due to fatigue or inadvertence. The current fixturing research is focussed on improving the fixture quality and other aspects and do not address these issues. This research is focussed on three areas, to generate algorithms for automatically foolproofing the fixtures, to build locators with embedded sensors that could be used to verify the contact and foolproof the existing fixtures, and to design and experimentally validate fixtures for free-form surfaces with sensors to verify the location. In foolproofing, workpieces were classified into different categories to identify the existence of a solution and the geometry was simplified and used to search for a solution based on symmetry/asymmetry to discover a foolproofing location. The algorithms were implemented in a CAD software and the solutions were verified in 3D space. The locators with inbuilt sensors were designed for foolproofing and location verification purposes and the sensors were used in case studies to establish credibility. A sensor based fixture design method is created for the part location of free-form surfaces using fiber optic sensors. An experimental fixture with sensors incorporated in the locators was used to determine the effects of surface curvature on the sensitivity of the sensors. A new theory on best locations for the sensor based locators by utilizing surface curvature is proposed based on the experimental results. The SFDV implementation may help realize the dream for any manufacturing system aspiring to move beyond the six sigma levels of quality and achieve zero defects. error proofing foolproofing poka-yoke Free-form surfaces Fixture Jigs and fixtures Computer aided fixture design Detectors Industrial applications Machining Automation Computer-aided fixture design
25	Study of Fixturing Accessibilities in Computer-Aided Fixture Design Ghatpande, Puja Sudhakar 08 August 2008 (has links) "Fixtures form an important factor in traditional and modern flexible manufacturing systems, since fixture design directly affects manufacturing quality and productivity. Hence, it is necessary to evaluate quality of fixture design. The fixturing accessibility refers to machining feature accessibility and loading /unloading accessibility. The development of Computer Aided Fixture Design (CAFD) has simplified this task. Fixture design activities include setup planning, fixture planning and fixture configuration design. Fixture design verification comes next. Fixturing accessibility using Computer Aided Fixture Design is part of the verification process and has not received much attention till date. Machining feature accessibility analysis involves the evaluation of possible interference between fixture components and the cutting tool, which moves with pre-programmed tool path, while the loading and unloading accessibility relates to the ease with which the operator attaches/detaches the workpiece from the surrounding manufacturing environment. This research has three main focuses. The first focus is to evaluate machining feature accessibility, by integrating fixture designs in SolidWorks and the NC programming in Esprit. The main goals are evaluation of fixture design for any kind of interference between tool/workpiece/fixtures and enable Esprit to indicate interference, if any. The next step is to modify the fixture design accordingly and thus, finally obtain an interference free fixture design by reiteration. The second and third focuses deal with analysis of loading and unloading accessibility. A simulation based approach is applied to evaluate loading/unloading paths for different workpiece-fixture setups and checking interference in a dynamic mode. Then the third focus is to develop analysis method and criteria of comparisons of fixturing accessibility in different fixture designs. Thus, this research establishes methods of analysis for accessibilities in fixture design. Also, the guidelines for good fixture design will prove to be of great use to both, the beginners as well as the experienced fixture designers in this field. " Accessibility CAM CAD Integration Fixture Design Jigs and fixtures Computer-aided design Flexible manufacturing systems CAD/CAM systems
26	Untersuchungen von Setzvorgängen zur Auslegung von Durchsetzmaschinen im Feinkornbereich Ojeda Laura, Rilmar Abel 17 March 2017 (has links) Die Analyse des gegenwärtigen Wissenstands zu den Setzmaschinen zeigt, dass sie vornehmlich empirisch auf der Grundlage von Betriebserfahrungen und Versuchen dimensioniert werden. Die Hauptursache ist die mangelnde mathematisch-physikalische Durchdringung des Setzprozesses. Insbesondere im Feinkornbereich besteht sowohl bei der mathematisch-physikalischen Modellbildung, als auch für den Bereich systematischer experimenteller Untersuchungen Forschungsbedarf. Das Ziel dieser Arbeit war die Entwicklung eines Auslegungsmodells speziell für Durchsetzmaschinen. Ausgangspunkt für die Entwicklung des Modells war die Erarbeitung einer Systematik unter Berücksichtigung der für den Durchsetzprozess relevanten Einfluss- und Zielgrößen. Die Ergebnisse der durchgeführten experimentellen Untersuchungen relevanter Einflussgrößen dienten zur Validierung der Ergebnisse des zu entwickelnden Modells. info:eu-repo/classification/ddc/620 ddc:620
27	3D Printed Customized Tooling Development Approach Thawaba, Sami January 2021 (has links) 3D printing technologies have been gaining a lot of popularity in the last fifteen years, technologies like Fused Deposition Modeling (FDM) 3D printing have never been as accessible as they are today, and with the introduction of the desktop 3D printer, the technology is becoming a mainstream tool for developing prototypes and direct part production from a Computer-Aided Design (CAD) file. In an industrial context, the technology is utilized for different purposes, among which is the development and production of customized and task-specific tools. The proposed work in this thesis is an approach to simplify and streamline the development process of customized production tooling and workstation. The approach was used to identify problems and improvement opportunities at a production facility that delivered IT products. Furthermore, the Technical framework included in the proposed approach provided a guiding path to follow for the prototype development of tools to address identified problems. Developed tools and proposed solutions positively affected the production line work procedure and were accepted and adopted. While other solutions required further exploration and iterative cycles as some reluctance was experienced hence it implied changes in the workflow and daily routines. Additive Manufacturing Rapid prototyping Lean Manufacturing User Centered Design jigs fixture Reliability and Maintenance Tillförlitlighets- och kvalitetsteknik Övrig annan teknik
28	Návrh průkazných statických pevnostních zkoušek letounu v kategorii UL / Design of certification static strength tests of the aircraft UL category Serediuk, Vadym January 2021 (has links) The diploma thesis involves the design of certification static strength tests for the newly developed aircraft of the TL-Ultralight company. At the beginning of the work, the theory of aircraft testing is generally discussed with emphasis on static strength tests. Furthermore, an analysis of the requirements of the Czech regulation UL 2 and the German LTF-UL, which represent the certification basis for this aircraft, is performed. The requirements of regulations on the construction of the aircraft (or its individual parts) and the requirements for strength tests are discussed in detail. Based on the regulation and the provided calculation protocols, individual test cases and test plans of the wing, tail surfaces, engine bed, and chassis are calculated and prepared. In the end, the calculation of the rocker system and the basic design of jigs are performed.
29	Riskanalys inom MRO-industrin / Risk Analysis in the MRO industry Brstina, Stefan, Rizkallah, Leon January 2022 (has links) MRO-industrin är en kritisk del för underhåll inom flygindustrin och arbetsprocesserna ser olika ut från företag till företag. För att kunna utföra ett så säkert och kvalitetsmässigt arbete som möjligt så är det viktigt att riskbedöma samt minimera existerande risker i operationen för att säkerställa kvalitet till kund samt säkerhet för arbetare. Uppdragsgivaren ST Engineering Aerospace Solutions (STEAS) är det ledande företaget i Sverige när det gäller MRO arbete och med den ständiga utvecklingen av utrustning upptäcks det allt fler risker som kräver analyser och minimering. Forskning har tidigare gjorts på hur fixtur design kan förbättras ergonomiskt m h a virtuell miljöteknik. Detta för att kunna minimera design och tillverkningskostnader med hänsyn till itereringsprocessen. Detta i kombination med studier gjorda på muskuloskeletala skador med kopplingar till MRO-industrin belyser behovet av riskanalys i MRO industrin. Arbetet hos STEAS går ut på att utföra riskanalyser ur ett tekniskt, ergonomiskt och ekonomiskt perspektiv på deras rörliga fixturer samt kemiska processer som behandlar diverse komponenter av motornacellet. Detta för att STEAS sedan ska kunna kolla på eventuella kostnader och implementera de rekommenderade åtgärderna. Analysmetoderna som används är en PHL (Preliminary Hazard List), FMEA (Failure Modes and Effects Analysis) och en ACHB analys (Accidental Cost & Hypothetical Benefit) / The MRO industry is a critical part of maintenance in the aviation industry where the work processes differ from company to company. In order to be able to perform as safe and high-quality work as possible, it is important to assess risks and minimize existing risks in the operation to ensure quality for customers and safety for workers. The client ST Engineering Aerospace Solutions (STEAS) is the leading company in Sweden interms of MRO work and with the constant development of equipment, more and more risks are discovered that require analysis and minimization. Research has previously been done on how fixture design can be improved ergonomically using virtual environment technology. This is to be able to minimize design and manufacturing costs with regard to the iteration process. This in combination with studies done on musculoskeletal injuries with connections to the MRO industry highlights the need for risk analysis in the MRO industry. The work at STEAS consists of performing risk analysis from a technical, ergonomic and financial perspective on their moving fixtures and chemical processes so that STEAS can then check for possible costs and implement the recommended measures. The analysis methods used are a PHL (Preliminary Hazard List), FMEA (Failure Modes and Effects Analysis) and an ACHB analysis (Accidental Cost & Hypothetical Benefit) MRO Risk Analysis Risk Identification Risk Management Maintenance Assembly Jigs Accidents Proactive Risk Analysis FMEA PHL PHA ACHB RPN SWOT OEM AFS Airbus Boeing Rolls Royce General Electrics Inlet Cowl Fan Cowl Exhaust Thrust Reverser MRO Riskanalys Riskidentifiering Riskhantering Underhåll Rörliga Fixturer Olyckor Proaktiv riskanalys FMEA PHL PHA ACHB RPN SWOT OEM AFS Airbus Boeing Rolls Royce General Electrics Inlet Cowl Fan Cowl Exhaust Thrust Reverser Engineering and Technology Teknik och teknologier

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