InformaApp - Publikationen

High quality holes of diameters less than 145 μm are required for the manufacture of next generation diesel fuel injection nozzles for improved combustion efficiency and reduction of emission to the environment. The current practice of using electro-discharge machining (EDM) drilling of fuel injection nozzles is limited in terms of the hole size it can produce effectively and the length of time needed to drill. In addition, the tooling cost is high. This paper reports on an investigation into a sequential laser and EDM micro-drilling technique for the manufacture of next generation fuel injection nozzles. A laser-drilled pilot hole is rimmed out by EDM drilling. It was found that this hybrid process has eliminated the problems of recast and heat affected zones typically associated with the laser drilling process. The new process has enabled a 70% reduction in total drilling time compared to standard EDM drilling as less material is removed by the EDM. The quality of the holes is as good as direct EDM drilling, thus eliminating the need for re-certification of the drilling process. Various combinations of laser/EDM drilling conditions have been examined. Optimum diameters for the pilot hole and the EDM electrode have been identified for a particular diameter of fuel injection nozzle, giving the minimum total drilling time and the best quality holes. A special system was designed to enable the alignment of nozzles to be controlled to within ± 20 μm. The technique has enabled valuable cost savings and increase in production capacity for next generation fuel injection nozzle manufacture.

Maschinenbau und Mechatronik

Vortrag

F. Wagner, Hans Helml, Roswitha Giedl-Wagner, M. Wild

Laser drilling applications in fuel injection systems

ALAC, Detroit, MI, USA

2004

Maschinenbau und Mechatronik

Beitrag (Sammelband oder Tagungsband)

F. Wagner, Hans Helml, Roswitha Giedl-Wagner, M. Wild

Geometrical aspects of laser-drilled high precision holes for flow control applications

Proceedings of SPIE - Fourth International Symposium on Laser Precision Microfabrication, München, 21.06.2003, vol. 5063

2003

Maschinenbau und Mechatronik

Vortrag

F. Wagner, Hans Helml, Roswitha Giedl-Wagner, M. Wild

Geometrical aspects of laser-drilled high precision holes for flow control applications

4. Internationales Symposium „Laser Precision Microfabrication – LPM 2003, München

2003

Maschinenbau und Mechatronik

Vortrag

F. Wagner, Hans Helml, Roswitha Giedl-Wagner, M. Wild

Geometrical aspects of laser-drilled high precision holes for flow control applications

AILU Technology Workshop – Applications of Laser Microprocessing, Oxford, Großbritannien

2003

Maschinenbau und Mechatronik

Vortrag

F. Wagner, Hans Helml, Roswitha Giedl-Wagner, M. Wild, et al.

Bohren mit der Trepanieroptik

Stuttgarter Lasertage (SLT) 2003, Stuttgart

2003

Maschinenbau und Mechatronik

Vortrag

F. Wagner, Hans Helml, Roswitha Giedl-Wagner, M. Wild

Bohren von Metall mit Nanosekundenlaser

Forum Photonics BW – Präzisionsbohren mit Kurzpulslasern, Stuttgart

2002

Maschinenbau und Mechatronik

Zeitschriftenartikel

P. Dyer, Roswitha Giedl-Wagner, R. Farley

Analysis and application of a 0/1 order Talbot interferometer for 193 m laser grating formation

Optics Communications, vol. 129, no. 1-2, pp. 98-108

1996

Abstract anzeigen

We report the analysis, design and application of a Talbot interferometer in which the zero and first order beam from a grating are recombined. This interferometer produces fringes of the same period, d, as the master grating or phase mask rather than View the MathML source when the ±1 orders are employed. Experiments using the View the MathML source Talbot interferometer with 193 nm ArF laser illumination to write gratings on polymers by ablation and photosensitive Bragg gratings in fibres are reported.

Maschinenbau und Mechatronik

Vortrag

P. Dyer, Roswitha Giedl-Wagner, R. Farley, et al.

Excimer laser ablation of polymers and glasses for grating formation

E-MRS Spring Meeting, Session COLA, Strasbourg, Frankreich

1995

Maschinenbau und Mechatronik

Zeitschriftenartikel

P. Dyer, Roswitha Giedl-Wagner, R. Farley

Analysis of grating formation with excimer laser irradiated phase masks

Optics Communications, vol. 115, no. 3-4, pp. 327-334

1995

DOI: 10.1016/0030-4018(94)00694-P

Abstract anzeigen

Excimer laser irradiated phase masks provide a convenient and effective method for writing micron-scale gratings for optoelectronic device applications. Here we analyze the interference field produced by a periodic mask and assess the near-field energy density and fluence distribution for varying degrees of order content when exposed using an excimer laser with finite spatial and temporal coherence. Results are compared with experimental findings for gratings produced on ablated polymers and in optical fibres.

Maschinenbau und Mechatronik

Vortrag

P. Dyer, Roswitha Giedl-Wagner, R. Farley, et al.

ArF excimer laser produced incubated damage gratings in optical fibre

IOP Meeting on In-Fibre Bragg Gratings and Special Fibres, London, Großbritannien

1994

Maschinenbau und Mechatronik

Vortrag

P. Dyer, Roswitha Giedl-Wagner, R. Farley, et al.

Incubation effects in excimer laser irradiated glasses and application to fibre grating fabrication

Meeting of the Society of Glass Technology on Photosensitive Glasses, Harlow, Großbritannien

1994

Maschinenbau und Mechatronik

Zeitschriftenartikel

P. Dyer, Roswitha Giedl-Wagner, K. Byron, R. Farley

Amplification of fibre Bragg grating reflectivity by post-writing exposure with 193 nm ArF laser

Electronics Letters, vol. 30, no. 14, pp. 1133-1134

1994

DOI: 10.1049/el:19940780

Abstract anzeigen

The reflectivity of weak in-fibre gratings (a few percent reflectivity) written by an ArF laser illuminated phase mask can be dramatically enhanced (reaching ⩾95%) by subsequent exposure using a uniform ArF laser beam. This new effect offers the possibility of post-writing control of grating properties

Maschinenbau und Mechatronik

Zeitschriftenartikel

P. Dyer, Roswitha Giedl-Wagner, K. Byron, D. Reid, R. Farley

High reflectivity fibre gratings produced by incubated damage using a 193 nm ArF laser

Electronics Letters, vol. 30, no. 11, pp. 860-862

1994

Abstract anzeigen

High reflectivity gratings have been formed in optical fibre using a 193 nm ArF laser irradiated phase mask. Relatively high absorption in the fibre core at this wavelength coupled with an incubation effect in which the absorption grows with repeated exposure allows rapid grating formation (~10 pulses) at modest fluences ~400 m Jcm-2

Maschinenbau und Mechatronik

Zeitschriftenartikel

P. Dyer, Roswitha Giedl-Wagner, C. Ragdale, D. Reid, R. Farley

Study and analysis of submicron-period grating formation on polymers ablated using a KrF laser irradiated mask

Applied Physics Letters, vol. 64, no. 25, pp. 3389-3391

1994

DOI: 10.1063/1.111284

Maschinenbau und Mechatronik

Vortrag

P. Dyer, Roswitha Giedl-Wagner, R. Farley

Fabrication of sub-micron period gratings using an excimer laser irradiated phase mask

Posterpräsentation