Journal ArticleDOI
Influence of process parameters on surface roughness of aluminum parts produced by DMLS.
TLDR
In this paper, a model based on an L18 orthogonal array of Taguchi design was created to perform experimental planning and the upper surfaces of the samples were analyzed before and after shot peening.Abstract:
Direct metal laser sintering (DMLS) is an additive manufacturing technique for the fabrication of near net-shaped parts directly from computer-aided design data by melting together different layers with the help of a laser source. This paper presents an investigation of the surface roughness of aluminum samples produced by DMLS. A model based on an L18 orthogonal array of Taguchi design was created to perform experimental planning. Some input parameters, namely laser power, scan speed, and hatching distance were selected for the investigation. The upper surfaces of the samples were analyzed before and after shot peening. The morphology was analyzed by means of field emission scanning electron microscope. Scan speed was found to have the greatest influence on the surface roughness. Further, shot peening can effectively reduce the surface roughness.read more
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Investigation of surface shot blasting of AlSi10Mg and Ti6Al4V components produced by powder bed fusion technologies
TL;DR: In this paper , the effect of glass and zirconia microspheres and their combination on the surface roughness was analyzed on AlSi10Mg and Ti6Al4V parts.
Journal ArticleDOI
A low-cost, non-hazardous protocol for surface texturing of glass particles
Abstract: We present a cheap, efficient, and non-hazardous protocol for altering the roughness of hard particles at the nanometer-scale using a stone tumbler, a tool which is normally used for polishing stones. Six different textures were achieved by lining the tumbler with sandpaper of mean grit diameters $$d_{\mathrm{g}}=201$$, 58.5, 18.3, 12.6, and $$8.4\,\upmu \hbox {m}$$. Two textures were created by tumbling a batch of glass spheres for 4 h and for 12 h with the $$12.6\,\upmu \hbox {m}$$ sandpaper; all other textures were established by tumbling for 12 h. Surface roughness was characterized by the integral length scale, $$\xi$$, evaluated from 7 nm/pix resolution scanning electron microscope images. Roughness size increased from $$\xi = 24$$ to 31 nm as the grit size decreased from $$d_{\mathrm{g}} = 201$$ to $$18.3\,\upmu \hbox {m}$$, and then decreased to $$\xi = 6.4\,\hbox {nm}$$ at the smallest $$d_{\mathrm{g}}$$. The largest $$\xi \,(= 34\,\hbox {nm})$$ was achieved using a $$12.6\,\upmu \hbox {m}$$ sandpaper and the shorter tumbling time of 4 h. The permeability of a packed column of the particles broadly decreased with increasing $$\xi$$, indicating that permeability decreases with increasing roughness size.
Journal ArticleDOI
Understanding surface roughness on vertical surfaces of 316 L stainless steel in laser powder bed fusion additive manufacturing
Tianyu Zhang,Lang Yuan +1 more
TL;DR: In this paper , the effects of a wide range of processing parameters grouped by energy density on surface roughness, particularly at vertical surfaces in L-PBF, were investigated via confocal microscopy.
Journal ArticleDOI
Investigations on Mechanical Properties of Polyamide Parts Fabricated by Selective Laser Sintering Process
Journal ArticleDOI
A Novel Laser-Aided Machining and Polishing Process for Additive Manufacturing Materials with Multiple Endmill Emulating Scan Patterns
TL;DR: In this paper, the authors proposed a systematic approach to eliminate waviness and reduce surface roughness with the combination of laser-aided machining, macro-polishing, and micropolishing processes.
References
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Book
Laser Material Processing
TL;DR: In this paper, the effect of reflectivity of the surface, when a pure, monochromatic laser (6) is used, is remedied by the simultaneous application of a relatively shorter wavelength beam (1).
Journal ArticleDOI
Selective laser melting of iron-based powder
Jean-Pierre Kruth,Ludo Froyen,J. Van Vaerenbergh,Peter Mercelis,Marleen Rombouts,Bert Lauwers +5 more
TL;DR: In this paper, a mixture of different types of particles (Fe, Ni, Cu and Fe3P) specially developed for selective laser sintering (SLS) is described.
Journal ArticleDOI
Consolidation phenomena in laser and powder-bed based layered manufacturing
TL;DR: In this article, the authors describe which types of laser-induced consolidation can be applied to what type of material, and demonstrate that although SLS/SLM can process polymers, metals, ceramics and composites, quite some limitations and problems cause the palette of applicable materials still to be limited.
BookDOI
Rapid manufacturing : an industrial revolution for the digital age
TL;DR: In this paper, the authors present a discussion of the potential of rapid manufacturing in the automotive industry and present a case study of how to modify a garden fork handle in order to make it more efficient.