Laser Assisted Dry Ice Blasting - sbb-mbh.de · PDF fileEffizient und schonend reinigen Laser Assisted Dry Ice Blasting Informationsveranstaltung 13.11 ... Isothermal plasma Adiabatic

TechnicalUniversityBerlin
Institute forMachine Toolsand Factory ManagementProf. Dr.-Ing. Eckart Uhlmann
Effizient und schonend reinigen Laser Assisted Dry Ice Blasting
Informationsveranstaltung 13.11.2008 SBB mbH, Potsdam
Laser Assisted Dry Ice BlastingA Hybrid Machine Tool Concept for Cleaning and Recycling
Effizient und schonend reinigenInnovative Verfahren zur Reinigung, Entschichtung und Vorbehandlung von Oberflchen
Informationsveranstaltung 13.11.2008 Sonderabfallgesellschaft Brandenburg/Berlin mbH (SBB), Potsdam
Prof. Dr. h. c. Dr.-Ing. Eckart UhlmannDipl.-Ing. Robert HollanKontakt: [email protected], Tel. 030 / 314 22 413

Production Technology Center BerlinProf. Dr. h. c. Dr.-Ing. Eckart Uhlmann
Institute for Machine Tools and Factory ManagementTechnical University Berlin
Fraunhofer Institute for Production Systems and Design Technology
1986 IWF and IPK moved into PTZ
450 employees (scientists, service and students)
More than 70 test areas and 7 special laboratories on approx. 7 100 m
Budget of 24 Mio. Euro
Spin-offs and start-ups by 12 % of former staff members

Overview Structure of Presentation
Introduction
Stand-alone-Technologies
Dry Ice Blasting, Laser Processing
Metrology
Optimization of Stand-alone-Technology
Hybrid Machine Tool Concept
Hybrid Cleaning Strategy
Results of Hybrid Tests
Surface Quality
Summary and Outlook

Introduction Collaborative research center SFB 281 Disassembly Factories for the development of recycling technologies funded by the German Research Foundation DFG
TFB: Components, systems, methods and information technology tools for practical product and material cyclesDevelopment of the hybrid cleaning technology with dry ice blasting and laser (E7)
Motivation:
Introduction Stand-alone-Technologies Metrology Optimization Hybrid Machine Tool ConceptHybrid Cleaning StrategyResults of Hybrid TestsSurface QualitySummary and Outlook
Recycling requires a de-coating and a cleaning process as well as a pre-treatment.Environmental friendly technologies dry ice blasting and laserRemoval of highly adhering or hard contami-nants, protective or functional coatings
1 2 3 4
1 2

Stand-alone-Technologies Dry Ice Blasting I
One-way blasting medium: Solid carbon dioxide pellets
dP
lP
TP = -78,3 CP = 1100 kg/m
lP = 5 - 15 mmdP = 3,0 mm

Stand-alone-Technologies Dry Ice Blasting II
SS
Removal Mechanisms:Impact
Thermal Effect
Sublimation

Stand-alone-Technologies Dry Ice Blasting III
Blasting pressure:Up to 16 bar
Principle:Because of independent ad-justable blasting pressure (2) and transport pressure (3) capable of injection principle as well as compressed air blasting
Dry ice mass flow:Up to 20 - 105 kg/h
Dry ice blasting equipment:
Artimpex device Cryonomic Cab52, based on the injection principle, blasting nozzle G 5000 (venturi injector)
1
2
3
4
7
5
6

Stand-alone-Technologies Dry Ice Blasting III
1 24
3
5
Blasting pressure:Up to 16 bar
Principle:Compressed air blasting
Dry ice mass flow:Up to 30 - 100 kg/h
Blasting nozzles:asdf
ICETECH device ICEBLAST KG 30, based on the compressed air blasting principle

Stand-alone-Technologies Dry Ice Blasting IV
Blasting pressure: From 4,5 to 16 bar of compressed air
Liquid carbon dioxide pressure: High pressure liquid car-bon dioxide bottle, 57 bar
Liquid carbon dioxide mass flow: From 20 up to 45 kg/h
KIPP device for carbon dioxide snow blasting
1 Compressed air2 Liquid CO2 3 Agglomeration chamber4 Blasting nozzle

Stand-alone-Technologies Laser Processing I
Interaction Laser-Material: Reflection Transmission Absorption
wavelength [m]
abso
rpta
nce
A [%
]Material removal process:
AbsorptionSublimation, ionisationMeltingIsothermal plasma Adiabatic expansion

Stand-alone-Technologies Laser Processing II
*cw-modus: continuous-wave modus
Wavelength:940 nm 5 nmLaser power:Up to 1500 W Laser frequency: In cw-modus* appliedPulse duration:In cw-modus* appliedDiameter of focus:3,8 mm x 8 mm
Equipment for Laser processing:
Dilas Diodenlaser device Dilas Diodenlaser 1500 W

Stand-alone-Technologies Laser Processing III
1
2
6
3
4
7
5
Wavelength:1064 nmcw-laser power:18 W (TEM-mode), 100 W (multi mode) Laser frequency: 0 kHz up to 10 (250) kHz Scanner frequency:0 Hz up to 300 Hz Pulse duration:90 nsDiameter of focus:20 m (direct), 200 m (fibre)
Equipment for Laser processing:
Bauer+Mck Nd:YAG solid state laser device SV10

Metrology Standard of comparison and measurement device I
A B C D E
2 cm
Material removal rate: Defined standard of PUR-2 component
varnish Detection of surface profile transversal
to the robots movement Software based calculation of
cross sectional area (CSA) Information of material removal
transversal to robots movement (estimation of necessary overlapping)
Surface qualitiy: Measurement of the surface
roughness according to DIN EN ISO 4287
Taylor Hobson contact instrument for measurement of surface finish, form and contour Talysurf-120L: Diameter of the contact device: 2 m Angle of the contact device: 60 Error of measurement: < 0,15 m Measuring range: 2 mm Measurement length: orthogonal 20 mm
collinear 5 mm

Metrology
A B C D E
2 cm
Material volume removal rate or cross sectional area (CSA): Surface profile transversal to
the robots movement Software based calculation
(Talymap Univ.) of cross sectional area (CSA) of removed material
Calculation of volume removal rate in case of different feed speeds
Gravimetric analysis in case of too rough surface for calculation of CSA
Tests with Rusted specimen and thermal sprayed coatings
Standard of comparison and measurement device II
CSA
Maximum depth: 163 mCSA: 1,21 mm
Surface profile

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Laser Assisted Dry Ice Blasting - sbb-mbh.de · PDF fileEffizient und schonend reinigen Laser Assisted Dry Ice Blasting Informationsveranstaltung 13.11 ... Isothermal plasma Adiabatic