Modelling of self-limiting laser ablation of rough surfaces: application to the polishing of diamond films

Tokarev, V. N.; Wilson, J. I. B.; Jubber, M. G.; John, P.; Milne, David

doi:10.1016/0925-9635(94)00241-x

Cited by 56 publications

(17 citation statements)

References 19 publications

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“…In the ion-beam machining methods, the diamond film is removed using ion sources from sputtering [10]. In the laser machining method, the diamond film is evaporated using a laser beam [11,12]. Laser and ion-beam machining methods are non-contact methods that may be used to finish curved surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…However, the surface roughness of a diamond film coated by the chemical vapor deposition (CVD) process increases with increasing film thickness, and its maximum value can achieve several microns [2]. Hence, the surface roughness must be decreased to meet the actual requirement from sub-microns to nanometers, but the surface machining process is time consuming and expensive [3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Grinding characteristics of diamond film using composite electro-plating in-process sharpening method

Chen

Chiou

Lee

2009

International Journal of Machine Tools and Manufacture

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Grinding characteristics of diamond film using composite electro-plating in-process sharpening method

Chen

Chiou

Lee

2009

International Journal of Machine Tools and Manufacture

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“…For high precision manufacturing on rotational workpieces, a quasi-tangential process is favorable to hold tight tolerances with superb surface quality [6]. The principal idea of grazing-incidence laser ablation makes a self-limiting laser ablation process possible [7]. This enables smoothing of a prior rough surface under oblique irradiation with θ i >75 • .…”

Section: Introductionmentioning

confidence: 99%

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

Ackerl

Warhanek

Gysel

et al. 2019

Int J Adv Manuf Technol

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Quasi-tangential laser processing, also called laser turning is increasingly applied for various applications. Specifically, its ability to generate complex geometries with small feature sizes at high precision and surface quality in hard, brittle and electrically non-conductive materials. Due to the geometric flexibility, the process is well suited for prototyping in hard-to-machine materials such as ceramics, carbides and super-abrasives. However, the lack of advanced software solutions for this novel process hitherto limited the exploitation of this potential. Here, we discuss a unique computer-aided manufacturing approach for synchronous 7axis laser manufacturing with quasi-tangential strategies. This gives the peerless possibility to process arbitrary geometries, which cannot be manufactured with conventional techniques. A detailed description of the path calculation with derivation and procedures is given. The generated machine code is tested on a 7-axis laser manufacturing setup. Following, a processed cylindrical ceramic specimen with a continuously varying profile along a helical path is presented. The profile is constituted by a rectangular over half-spherical to a triangular groove with defined pitch. This demonstrator provides the validation of this CAM solution. Measurements of the produced specimen show high adherence with the target geometry with an average deviation below 10 µm.

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“…mond polishing [19]. The laser is steered under oblique incidence θ i >75 deg over the surface with a energy density slightly above the threshold.…”

Section: Introductionmentioning

confidence: 99%

Ultrashort-Pulsed Laser Machining of Dental Ceramic Implants

Ackerl¹,

Warhanek²,

Gysel³

et al. 2018

Preprint

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A novel approach for machining of cylindrical hard materials and arbitrary shapes is presented. Alumina-toughened zirconia dental implants with complex geometry are manufactured with femtosecond quasi-tangential laser ablation. This rapid-prototyping approach for small-scale production decreases the development-time cycle tremendously and trumps conventional approaches. Moreover, a competitive parameter study for radial and tangential ablation with single and multi-pulse is presented. A process achieving an ablation rate of 1mm3/min with a surface roughness Ra of 0.2 µm is introduced. The meta-stable tetragonal phase of the ceramic persists and is assessed via Raman spectroscopy. The small heat-affected zone is subsequently ablated with a radial laser process step. Hence, high-precision dental implants with a mean error of smaller 5 µm over the complete contour are shown.

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Modelling of self-limiting laser ablation of rough surfaces: application to the polishing of diamond films

Cited by 56 publications

References 19 publications

Grinding characteristics of diamond film using composite electro-plating in-process sharpening method

Grinding characteristics of diamond film using composite electro-plating in-process sharpening method

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

Ultrashort-Pulsed Laser Machining of Dental Ceramic Implants

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