Laser Additive Manufacturing of Gas Permeable Structures

Klahn, Christoph; Bechmann, Florian; Hofmann, Sandra; Dinkel, Markus; Emmelmann, Claus

doi:10.1016/j.phpro.2013.03.161

Cited by 19 publications

(15 citation statements)

References 6 publications

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“… A long scan vector leads to high residual stress within the melt track and subsequent distortion of the structure [43].  Differently orientating the scan vectors for every layer leads to a reduction of residual stress [8], [44].…”

Section: Scan Strategy Developmentmentioning

confidence: 99%

“…In Figure 7 the vector sets have been labelled from 1 to 8, and the islands have been labelled A, B, C, and D. During development iterations of the new strategy, vector set 8 was scanned in all the islands, one after another. This caused the islands to fuse together and act as one long melt pool, which led to a large stress build-up in those vector sets [26], [43], [47]. In order to counter this, the new strategy allows the laser to scan only the outer vector sets (8) that are not adjacent to each other.…”

Section: Island Contour Scanning Strategymentioning

confidence: 99%

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The Effects of Selective Laser Melting Scan Strategies on Deviation of Hybrid Parts

Hagedorn-Hansen¹,

Bezuidenhout²,

Dimitrov³

et al. 2017

SAJIE

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The use of additive manufacturing to produce intricate part geometries in the aerospace, medical, and tool-and-die industries is increasingly incorporated in manufacturing process chains. However, the high costs, long production times, and material integrity issues associated with additive manufacturing technologies such as selective laser melting make the process suitable only for certain applications. In order to reduce selective laser melting production costs for selected parts, a combination of selective laser melting and milling can be used. Metal parts produced with this method are referred to as hybrid parts. A challenge in producing hybrid parts is to reduce the geometrical deviation due to processinduced warping. This paper discusses the effects of various laser scan strategies on the deviation of hybrid parts. A newly developed scan strategy is experimentally compared with its commercial counterpart with regard to as-built part warping and porosity. The novel strategy resulted in a significant reduction in warping and porosity. OPSOMMINGDie benutting van toevoegingsvervaardiging vir die produksie van komplekse onderdeel geometrieë in die lugvaart, mediese, en werktuig industrieë word toenemend geïnkorporeer in vervaardigingsproseskettings. Gepaardgaande hoë kostes, lang produksietye, en materiaal integriteitstekortkominge met toevoegingsvervaardiging tegnologieë soos selektiewe laser smelting veroorsaak dat die proses slegs uitvoerbaar is vir sekere toepassings. Ten einde selektiewe laser smelting produksiekoste te verminder vir geselekteerde onderdele, kan 'n kombinasie van selektiewe laser smelting en freesmasjinering geïmplementeer word. Metaal onderdele wat met so kombinasie geproduseer word, word na verwys as hibried onderdele. 'n Uitdaging in die vervaardiging van hibried onderdele is om geometriese afwyking deur skeeftrekking wat deur die proses veroorsaak word, te verminder. Hierdie artikel bespreek die effekte van verskeie laser skandeer strategieë op die afwyking van hibried onderdele. 'n Nuut ontwikkelde skandeer strategie is eksperimenteel vergelyk met 'n kommersiële eweknie met betrekking tot skeeftrekking en porositeit. Die skeeftrekking en porositeit van die nuut uitgevonde strategie is beduidend laer.

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Section: Scan Strategy Developmentmentioning

confidence: 99%

Section: Island Contour Scanning Strategymentioning

confidence: 99%

The Effects of Selective Laser Melting Scan Strategies on Deviation of Hybrid Parts

Hagedorn-Hansen¹,

Bezuidenhout²,

Dimitrov³

et al. 2017

SAJIE

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show abstract

“…This confirms the result of the visual inspection of Figure 10.14. 41 Figure 10.23 indicates that the end of the measurement range of the flow meter at V · max = 200 L/min was reached at very low pressure differences for most hatch distances. This is due to the large gas-permeable section of the samples, and it was assumed that the results only cover a laminar flow because of the low speed of air in the gaps.…”

Section: Gas Permeability Of Laser Additive Manufactured Materialsmentioning

confidence: 99%

“…To produce permeable material, the position of the fields of the checkerboards no longer varies between the layers, and the position of the melt tracks is constant. 41 The design is not limited to checkerboards. Tilings with other geometric elements are possible, such as with triangleor hexagon-shaped tiles as shown in Figure 10.13.…”

Section: Strategies For Gas-permeable Structuresmentioning

confidence: 99%

“…The parameters in Table 10.3 were used to manufacture solid and gas-permeable sections of the samples in one build job. 41 The permeability of these samples is tested on the test bench sketched in Figure 10.22. A supply system provides dry and unlubricated compressed air at temperature T sys and an adjustable system pressure (p sys ) in a range of 0 to 8 bar.…”

Section: Gas Permeability Of Laser Additive Manufactured Materialsmentioning

confidence: 99%

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Application of Radiometry in Laser Powder Deposition Additive Manufacturing

Srivatsan¹,

Sudarshan²

2015

Additive Manufacturing

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Fabrication of Sectionally Permeable Components with Curved Surface by Laser‐Beam Powder‐Bed Fusion

Xie

Fränkle

Klahn

et al. 2022

Chemie Ingenieur Technik

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Devices in process engineering often include permeable components. As shown in our recent work for planar components, laser-beam powder bed fusion offers the opportunity to integrate permeable sections into complex monolithic metal parts in one go. This paper extends the approach to components with curved surfaces. Different scan strategies were investigated for their effects on surface morphology and permeability of tubular samples. It was found that in order to ensure consistent properties of a permeable tube, different starting points or rotation of the scan vectors have to be used.

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Laser Additive Manufacturing of Gas Permeable Structures

Cited by 19 publications

References 6 publications

The Effects of Selective Laser Melting Scan Strategies on Deviation of Hybrid Parts

The Effects of Selective Laser Melting Scan Strategies on Deviation of Hybrid Parts

Application of Radiometry in Laser Powder Deposition Additive Manufacturing

Fabrication of Sectionally Permeable Components with Curved Surface by Laser‐Beam Powder‐Bed Fusion

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