Path calculation of 7-axes synchronous quasi-tangential laser manufacturing

Ackerl, Norbert; Warhanek, Maximilian; Gysel, Johannes; Wegener, Konrad

doi:10.1007/s00170-019-03540-5

Cited by 11 publications

(6 citation statements)

References 28 publications

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“…This corresponds to

. In the range from

up to

(

) a color change to red of the irradiated area is visible which indicates a reduction of oxygen content in the material [ 10 , 17 ]. The bottom of the groove is even at the center, whereas next to the sidewalls a curvature can be observed.…”

Section: Resultsmentioning

confidence: 99%

“…This processing technique enables the shaping of freeform surfaces with low surface roughness compared to the orthogonal laser irradiation. The corresponding principle of calculating the path for synchronous motion of 5 mechanical and two optical axis for the quasi tangential processing configuration is described in detail in an additional publication by Ackerl et al [ 10 ]. However, laser machining in quasi-tangential configuration at high pulse energy leads to cracks on the surface.…”

Section: Introductionmentioning

confidence: 99%

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Laser Ablation Study of Cutting Ceramics with Consideration of the Beam Inclination Angle

et al. 2023

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Silicon alumina nitride (SiAlON) and alumina toughened zirconia (ATZ) ceramics are applied for ceramic cutting tools to machine, e.g., cast iron, nickel base alloys and other difficult-to-machine materials. The state of the art technology for manufacturing of the cutting tool geometry is grinding. Laser processing of ceramics is already studied in terms of ablation rate and roughness evaluation with the application of dental implant manufacturing. In the present study, laser machining of the mentioned ceramics is explored with a laser beam source of 1064 nm wavelength and 10 ps pulse duration (FWHM). The angle dependent energy specific removal rate is described in a model and the optimal pulse fluence for the different materials and the irradiation angles can be derived. For processing at irradiation angle of up to 75° no decrease of the relative absorption could be observed. For ATZ, lowest surface roughness is determined for both, orthogonal and quasi-tangential processing angle. For SiAlON, the roughness decreases constantly for higher tilt angles. A significant difference in the material answer with change of the sample composition can be detected and the results show the potential of further developing SiAlON ceramics towards machineability for laser ablation.

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“…This corresponds to

. In the range from

up to

(

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laser Ablation Study of Cutting Ceramics with Consideration of the Beam Inclination Angle

et al. 2023

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“…A galvo scanhead (Scanlab Hurryscan II) enables a fast beam steering and the complete configuration is controlled by Aerotech drives and the A3200 software for synchronous axes movement. The laser machining utilizes a 2.5D strategy, where the surface design is generated using CAD tools and a developed CAM software for the laser hatch and path computations [45]. This configuration allows a straightforward laser machining of distinct structures with high geometric flexibility.…”

Section: Laser Machining Configurationmentioning

confidence: 99%

Rationally designed ultra-short pulsed laser patterning of zirconia-based ceramics tailored for the bone-implant interface

Ackerl¹,

Bork²,

Hauert³

et al. 2020

Preprint

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Ceramic composite materials are increasingly used in dental restoration procedures, but current ceramic surface designs do not yet achieve the osseointegration potential of state-of-the-art titanium implants. Rapid bone tissue integration of an implant is greatly dependent on its surface characteristics, but the material properties of ceramic composite materials interfere with classical surface modification techniques. Here, ultra-short pulsed laser machining, which offers a defined energy input mitigating a heat-affected zone, is explored for surface modification of ceramic composites. Inspired by surface textures of clinically relevant titanium implants, dual roughness surfaces are laser patterned. Raman mapping reveals a negligible effect of ultra-short pulsed laser ablation on material properties, but a laser-induced change in the wetting state is revealed by static contact angle measurements. Laser patterning of surfaces also influences blood coagulation, but not the attachment and spreading of osteoblastic cells. The presented laser machining approach thus allows the introduction of a rational surface design on ceramic composites, holding great promise for the manufacturing of ceramic implants.

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“…This allows the use of high average power at fast surface speeds leading to more competitive laser machining processes with decent surface quality and geometric conformity [20,30]. Especially, quasi-tangential laser machining has a huge potential and could utilize the high power nowadays available for ablation, but with increased complexity in the laser path and hatch calculation compared to 2.5D strategies [31].…”

Section: Introductionmentioning

confidence: 99%

Evolution of microstructures on stainless steel induced by ultra-short pulsed laser ablation

et al. 2020

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Ultra-short pulsed laser ablation of stainless steel is accompanied by the evolution of different microstructures. Depending on the fluence, accumulated energy and number of laser passes cones from impurities, laser induced periodic surface structures, cone-like protrusion (CLP), and thermal bumps evolve at the surface. These often unwanted morphologies can be induced or inhibited by carefully choosing the strategy and laser parameters. The investigated range reveals a small processing window for defined 515 nm sub 1 ps ablation leading to low surface roughness using circular polarization. Hitherto, the origin and dependencies of CLP are still not well understood and for the first time a precursor ripple structure reported. These precursor ripples reveal supra-wavelength periodicity with about 2 μm spacing and evolve earliest after the second layer of ablation. Potentially, low spatial frequency laser-induced periodic surface structure generated with the first laser pass with pulse and hatch overlap are the root cause of CLP evolution. Moreover, the CLP growth is grain orientation and strongly polarization state dependent. Preferentially, CLP start to evolve at the {110} planes of the face-centered cubic crystals of the inspected austenitic stainless steel and linear polarized laser radiation revealing a 1:1 aspect ratio of 10 μm. A nanoindentation study at the interface near region on cross-sections reveals robust mechanical properties of this CLP structure.

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Path calculation of 7-axes synchronous quasi-tangential laser manufacturing

Cited by 11 publications

References 28 publications

Laser Ablation Study of Cutting Ceramics with Consideration of the Beam Inclination Angle

Laser Ablation Study of Cutting Ceramics with Consideration of the Beam Inclination Angle

Rationally designed ultra-short pulsed laser patterning of zirconia-based ceramics tailored for the bone-implant interface

Evolution of microstructures on stainless steel induced by ultra-short pulsed laser ablation

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