Effect of Building Platform Position on the Surface Quality, Dimensional Accuracy, and Geometrical Precision of Direct Metal Laser Sintering (DMLS) Parts

Oter, Zafer Cagatay; Coşkun, Mert

doi:10.2139/ssrn.3785856

Cited by 4 publications

(6 citation statements)

References 11 publications

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“…The structural porosity is generally high in SLM structures, and the variability can further increase depending on the part location. The change in surface roughness and mechanical strength due to part position in the powder bed has been discussed previously in the literature [1,5,16]. Since the samples were developed at optimized laser parameters provided by machine (EOS) suppliers, there are limited chances to improve the overall mechanical properties by choosing other optimized processing parameters.…”

Section: Linear Regression Methodsmentioning

confidence: 99%

“…The uncertainties in powder granulometry within the build chamber, such as powder size, shape, distribution, and powder packing density, can significantly alter final mechanical and surface properties, hindering parts' repeatability and product quality [5,14,15]. Moreover, the processing conditions such as the scanning location, geometry type, and atmospheric conditions can alter the final mechanical properties of the SLM components [16,17]. Therefore, the mechanical properties of SLM components fabricated with identical laser parameters can still have different surface roughness, density, and mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

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Weibull distribution of selective laser melted AlSi10Mg parts for compression testing

Khan¹,

Dirikolu²,

Koç³

2021

J Adv Manuf Eng

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Selective laser melting (SLM) is an additive manufacturing process to fabricate three-dimen- sional structures by fusing powder particles using a computer-guided laser source. The SLM process can produce lightweight bespoke designs, having high strength comparable to con- ventional components. However, the developed surface texture and some of the mechanical properties are still sub-standard compared to the conventional components. The process un- certainty can produce inconsistency in parts’ properties, even those prepared concurrently, affecting SLM parts' repeatability and quality. Therefore, designing applications based on the most probable outcome of the desired properties can embrace process uncertainty. Weibull distribution is a statistical-based probability distribution method that measures the likelihood of the values’ occurrence of any random variable falling in a specific set of values. In this study, the Weibull distribution measured the relative likelihood (90% probability) of the compressive yield, and ultimate strength of the SLM prepared AlSi10Mg samples in a given 22 random sample size. The results showed that the compressive yield and ultimate strength fall between 321 MPa to 382 MPa and 665 MPa to 883 MPa.

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Section: Linear Regression Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Weibull distribution of selective laser melted AlSi10Mg parts for compression testing

Khan¹,

Dirikolu²,

Koç³

2021

J Adv Manuf Eng

View full text Add to dashboard Cite

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“…Other articles look at processspecific relationships, such as the effects of shielding gas flow (Bean et al, 2018). (Oter et al, 2020) As shown in Table 2, studies have produced contradictory results. Such as Baciu et al (2019) found that as laser scan velocity increases so may the surface roughness value.…”

Section: Build Parameter Studiesmentioning

confidence: 99%

“…Similarly, as particle powder size reduces, enabling the creation of finer features in parts, Balbaa et al (2021) found that the surface roughness increases, whereas Conlon and Azari (2018) found the opposite. Oter et al (2020) found through varying part positioning within an EOS machine, that the roughness is dependent on the part geometry and inclination of the walls due to the machine's laser incidence. Increasing the energy density, through varying laser power, scanning velocity, hatch distance or powder layer thickness, leads to an initial reduction in the surface roughness of parts.…”

Section: Build Parameter Studiesmentioning

confidence: 99%

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Surface Roughness Considerations in Design for Additive Manufacturing - A Literature Review

2021

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One often-cited benefit of using metal additive manufacturing (AM) is the possibility to design and produce complex geometries that suit the required function and performance of end-use parts. In this context, laser powder bed fusion (LPBF) is one suitable AM process. Due to accessibility issues and cost-reduction potentials, such ‘complex’ LPBF parts should utilise net-shape manufacturing with minimal use of post-process machining. The inherent surface roughness of LPBF could, however, impede part performance, especially from a structural perspective and in particular regarding fatigue. Engineers must therefore understand the influence of surface roughness on part performance and how to consider it during design. This paper presents a systematic literature review of research related to LPBF surface roughness. In general, research focuses on the relationship between surface roughness and LPBF build parameters, material properties, or post-processing. Research on design support on how to consider surface roughness during design for AM is however scarce. Future research on such supports is therefore important given the effects of surface roughness highlighted in other research fields.

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Effects of additive manufacturing on convective heat transfer in 3D-printed micro/mini-channels and fluid passages with micro/mini structures – The review

Bulsiewicz,

Łapka

2024

International Communications in Heat and Mass Transfer

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Effect of Building Platform Position on the Surface Quality, Dimensional Accuracy, and Geometrical Precision of Direct Metal Laser Sintering (DMLS) Parts

Cited by 4 publications

References 11 publications

Weibull distribution of selective laser melted AlSi10Mg parts for compression testing

Weibull distribution of selective laser melted AlSi10Mg parts for compression testing

Surface Roughness Considerations in Design for Additive Manufacturing - A Literature Review

Effects of additive manufacturing on convective heat transfer in 3D-printed micro/mini-channels and fluid passages with micro/mini structures – The review

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