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Lecturer(s)
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Course content
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LECTURES: 1. Introduction, basic definition, and classification of production machines. Classification of machine tools. 2. Properties and capabilities of different types of machine tools, accuracy, rigidity, forces, and power transmission. 3. Principles of machine tool design concerning accuracy, rigidity, and standardisation. Frame design, rigidity, strengthening. 4. Transmission mechanisms. Principles for their design. Mechanisms for changing the speed of feeds and spindles. Drives, selection criteria, division. 5. Bearings, loads, suitability of choice, accuracy. 6. Spindles, requirements, stiffness, examples of fits. 7. Straight-line motion devices. Calculations, design, examples. 8. Linear actuators. Calculations, design, examples. 9. Machines for intermittent motion. Calculations, design, examples. 10. Clutches and brakes in machine tools. 11. Guides, types, construction, rigidity. 12. Machine tool guards. 13. New trends in machine tool design. EXERCISE: 1. Basic calculations of machine time, speed, cutting forces, and power for machining. 2. Calculation of comparative machine rates. 3. Calculation of tuned boring bar damper. 4. Design of gearing system, gears calculation, gears design, shafts, speed deviations. 5. Optimisation of machine tool spindle fit. For example, calculate the optimum distance of supports. 6. Design of ball screw. Design of the feed drive. 7. Design and calculation of the ball mechanism. 8. Design and calculation of Maltese mechanism. 9. Excursions to laboratories and practical demonstrations of machine tools. 10. Disassembly and assembly of the spindle in the laboratory.
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Learning activities and teaching methods
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Monological explanation (lecture, presentation,briefing), Self-study (text study, reading, problematic tasks, practical tasks, experiments, research, written assignments), Demonstration, Lecture, Practicum, E-learning, 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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Written exam, Written assignment
CREDIT: Attendance at lectures and tutorials is essential. In some tutorials, a report of calculations or drawings produced will be required. Students should produce reports satisfactorily within a week. Credit is based mainly on performance during tutorials, report quality, and outlook. EXAMINATION: The examination is based on a written part (test).
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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). 11th ed.. Asia: McGraw-Hill, 2020. ISBN 978-1-260-57920-4.
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LEINVEBER, J., VÁVRA, P. Strojnické tabulky: učebnice pro školy technického zaměření. Úvaly. 2021.
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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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Pokorný Přemysl. Obráběcí stroje pro automatizovanou výrobu. Liberec. 2003.
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Pokorný Přemysl. Obráběcí stroje. Liberec.
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POKORNÝ, Přemysl. Textbook Machine Tools - part 2. .
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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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SOUČEK, Pavel. Převody v pohonech NC strojů a robotů. Praha. 2016, ISSN 1212-2572.
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SOUČEK, Pavel. Regulační pohony v posuvech NC strojů. Praha. 201, ISSN 1212-2572.
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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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Zelený Petr. Examples of Machine Parts Calculation. Liberec. 2016.
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ZELENÝ, Petr. Příklady výpočtů částí strojů. Liberec: Technická univerzita v Liberci, 2015.
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