Snmek 1

Anglicky v odbornch pedmtech"Support of teaching technical subjects in EnglishTutorial: Engineering technology

Topic: Water jet cutting

Prepared by: Ing. Josef Martink st.

Projekt Anglicky v odbornch pedmtech, CZ.1.07/1.3.09/04.0002je spolufinancovn Evropskm socilnm fondem a sttnm rozpotem esk republiky.

For treatment of soft materials is used Clean Water Jet WJMSuitable 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.Introduction

2WJM Water Jet Machining pure water jet or so called hydrodynamic machining AWJ Abrasive Water Jet Machining machinery by abrasive water jet

Basic techniques

Abrasive reservoirHigh pressure waterHigh pressure pipingWater jetMixing chamberAbrasive jetCutting materialPicturePrinciple schemeAWJ technologyWJM technology

Abrasive input system

Picture 2.14. Abrasive input systems for AWJ technologyJet with radial abrasive input to water jetJet with axial abrasive input

Machine description

Picture 2.3 Cutting machine description and its componentsMaterial for energy absorptionScrap waterScrap arresterAbrasive reservoirwaterOilTransport system (high pressure pipes)High pressure pumpTransport system and measuring equipmentHigh pressure valveSupporting grateWork pieceOutput jetAcross railWater jetMixing chamberCutting nipple

Machine description

AccumulatorHigh pressure piping with pressurised waterAbrasiveCutting nippleMultiplicatorAbrasive inputWater jetOil pumpWater inputElectric enginePrinciple AWJ technology scheme

Description of cutting nipple

Output jetAbrasive inputHigh pressure liquid inputHigh pressure pipeHigh pressure water jetMixing spaceMixing jetAbrasive water rayPicture 2.12 Cutting nipple scheme

Flame cutting example wall tile

Flame cutting examples different foam materials

Flame cutting examples - glass

Flame cutting examples different kinds of plastics

Flame cutting examples - aluminium

Flame cutting examples glass hardened fibres

Water is compressed by pump to pressure of 400 MPa (4 000 bars) Jets 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.Jets speed is 3 times higher than speed of sound.

Basic parameters

Describe basic techniques WMJ- AWJWhat material thickness can we cut?Questions and revision

DILLINGER. KOLEKTIV. Modern strojrenstv pro kolu i praxi. ISBN 9788086706191. pro konkurenceschopnost, ESF 2007 2013.Translation:www.seznam.czwww.slovnik.czJANATA, Petr. Handy slovnk technick anglicko-esk a esko-anglick. Plze: Nakladatelstv Fraus, 2000. ISBN 80-7238-075-3Lingea LEXIKON 5, Technick slovnk anglicko-esk a esko-anglick. 2010.

Literature