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Lecturer(s)
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Course content
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LECTURES: 1. Introduction, basic definitions, classification of machine tools, requirements. 2. Design principles, precision, stiffness, and standardisation. 3. Vibration in Machine Tools, sources, and stick-slip. 4. Drives, basic features, a criterion of usage. Electrical and hydraulic drives. 5. Mechanisms for speed and feed alternations. Gear mechanisms, design principles. 6. Bearings, loading, criterion precision. Spindles, requirements, stiffness, design examples. 7. Shafts, gear wheels, belt and chain drives. Calculations, examples. 8. Clutches and brakes. 9. Mechanisms of linear motion. Mechanisms of instructive rotary motion. 10. Devices for positioning and fixing. Slides, design principles, stiffness. 11. Structure design, stiffness, calculation, simulation. 12. Lubrication, cooling, and placement of machines. 13. Control devices, manipulation, and chip removal. 14. Final tests of machines and safety regulations. New trends in the design of machine tools. SEMINARS: 1. Basic machine time, speed, power and cutting forces calculations for machining. 2. Calculation of comparative rates of the machine. 3. Machine tool stiffness, fundamental approach to calculation. 4. Design of boring bar damper. 5. Decomposing load forces on the frame and machine parts in a simplified way. 6. Gearbox draft of the headstock. Design of stepping drive. Gear calculation. 7. Excursions to laboratories and practical demonstrations of machine tools. 8. Optimisation of machine spindle support. Example on spindle design. Spindle bearing design, examples. 9. Calculation of lead screw (nut). 10. Design of feed drive. 11. Design and calculation of Whitworth mechanism. 12. Calculation of Geneva drive (Maltese cross) mechanism. 13. Load calculations of machine tool guides and avoid strains. 14. Summary, subject rewires, credit evaluation.
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Learning activities and teaching methods
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Monological explanation (lecture, presentation,briefing), Lecture, Practicum, Students' self-study
- Class attendance
- 56 hours per semester
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Learning outcomes
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Description of machine tools, their characteristics and specific feasibility of machines. Precision, stiffness. Forces, Power transmission. Design for rigidity and performance, requirements. Design principles and Characteristics of various parts-e.g. spindles, feed mechanisms, guides, drives, clamping devices, frames, manipulation, control, automation.
Students will acquire knowledge of machine tools, their characteristics and feasibility, their requirements on precision, stiffness, rigidity, forces, power transmission. They learn design principles of various parts-e.g. spindles, feed mechanisms, guides, drives, clamping devices, frames, manipulation, control, automation.
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Prerequisites
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Area knowledge from Machine parts, Elasticity and stresses.
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Assessment methods and criteria
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Combined examination
CREDIT: Attendance on lectures and tutorials is essential. In some tutorials a report of produced calculations or drawing will be required. This should be produced within a week in satisfying manner. A Credit is based mainly on performance during tutorials, reports quality and outlook. EXAMINATION: Examination is based on written part (test) and oral part.
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Recommended literature
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BUDYNAS, R. G. and J. K. NISBETT. Shigley´s Mechanical Engineering Design (in SI Units). 10th ed.. Asia: McGraw-Hill, 2015. ISBN 978-981-4595-28-5.
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Marek, J. a P. Blecha. Konstrukce CNC obráběcích strojů III. 3 vyd.. Praha: MM publishing, 2014. ISBN 978-80-260-6780-1.
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Marek, J. et al. Design of CNC Machine Tools. Praha, 2015. ISBN 978-80-260-8637-6.
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MAREK, Jiří. Konstrukce CNC obráběcích strojů IV.0. Praha: MM publishing, 2018. ISBN 978-80-906310-8-3.
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ŘASA, Jaroslav, Přemysl POKORNÝ a Vladimír GABRIEL. Strojírenská technologie 3. 2. díl, Obráběcí stroje pro automatizovanou výrobu, fyzikální technologie obrábění. Praha: Scientia, 2005. ISBN 80-7183-336-3.
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SHIGLEY, J. E., Ch. R. MISCHKE, R. G. BUDYNAS, M. HARTL a M. VLK. Konstruování strojních součástí. Brno: VUTIUM, 2010. ISBN 978-80-214-2629-0.
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TEMPELMAN, Erik, Hugh SHERCLIFF a Bruno NINABER VAN EYBEN. Manufacturing and design: understanding the principles of how things are made. Burlington: Butterworth-Heinemann, 2014. ISBN 978-0-08-099922-7.
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Tlusty, George. Manufacturing Processes and Equipment. New Jersey: Prentice Hall, 2000. ISBN 0-201-49865-0.
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ZELENÝ, Petr. Příklady výpočtů částí strojů. Liberec: Technická univerzita v Liberci, 2015.
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