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Anglicky v odborných předmětech "Support of teaching technical subjects in English “

Anglicky v odborných předmětech "Support of teaching technical subjects in English “. Tutorial : Engineering technology Topic : Water jet cutting Prepared by: Ing . Josef Martinák st. Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002

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Anglicky v odborných předmětech "Support of teaching technical subjects in English “

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  1. Anglicky v odborných předmětech"Support ofteachingtechnicalsubjects in English“ Tutorial: Engineeringtechnology Topic: Waterjet cutting Preparedby: Ing. Josef Martinák st. Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

  2. Introduction • For treatment of soft materials is used Clean Water Jet WJM • Suitable abrasive is e.g. natural garnet, olivine and other materials selected to suit the hardness of cut material (e.g. salt, cocoa in food processing industry) • Standard accuracy is ±0,1 mm/m. • Cut material is not strained. • Cutting edge is not affected by heat, it is always cold cutting.

  3. Basic techniques • WJM – Water Jet Machining – pure water jet or so called hydrodynamic machining • AWJ – Abrasive Water Jet Machining – machinery by abrasive water jet

  4. Abrasive reservoir High pressure water Highpressure piping Water jet Mixing chamber Abrasive jet Cutting material AWJ technology Picture Principle scheme WJM technology

  5. Abrasive input system Picture 2.14. Abrasive input systems for AWJ technology Jet with radial abrasive input to water jet Jet with axial abrasive input

  6. Machine description Transport system (high pressure pipes) High pressure pump Transport system and measuring equipment High pressure valve water Oil Abrasive reservoir Across rail Cutting nipple Water jet Mixing chamber Supporting grate Workpiece Output jet Scrap arrester Scrap water Material for energy absorption Picture 2.3 Cutting machine description and its components

  7. Machine description High pressure piping with pressurised water Abrasive Accumulator Cutting nipple Multiplicator Abrasive input Electric engine Oil pump Water jet Water input Principle AWJ technology scheme

  8. Description of cutting nipple Abrasive input High pressure liquid input Output jet High pressure pipe High pressure water jet Mixing space Mixing jet Abrasive water ray Picture 2.12 Cutting nipple scheme

  9. Flame cutting example – wall tile

  10. Flame cutting examples – different foam materials

  11. Flame cutting examples - glass • Flame cutting examples – different kinds of plastics • Flame cutting examples - aluminium • Flame cutting examples – glass hardened fibres

  12. Basic parameters • Water is compressed by pump to pressure of 400 MPa (4 000 bars) • Jet´s diameter is 0,003 mm to 0,4 mm • If we want to reach smooth and accurate cutting, we use smaller travel speed ( about 25%). • Cutting is very noisy, it is possible to turn it down by cutting under water. • Jet´s speed is 3 times higher than speed of sound.

  13. Questions and revision • Describe basic techniques – WMJ- AWJ • What material thickness can we cut?

  14. Literature • DILLINGER. KOLEKTIV. Moderní strojírenství pro školu i praxi. ISBN 9788086706191. pro konkurenceschopnost, ESF 2007 – 2013. Translation: • www.seznam.cz • www.slovnik.cz • JANATA, Petr. Handy slovník technický anglicko-český a česko-anglický. Plzeň: Nakladatelství Fraus, 2000. ISBN 80-7238-075-3 • Lingea LEXIKON 5, Technický slovník anglicko-český a česko-anglický. 2010.

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