Micro-metal additive manufacturing – state-of-art and perspectives

Dornelas, Paulo Henrique Grossi; Santos, Tiago; Oliveira, J.P.

doi:10.1007/s00170-022-10110-9

Cited by 6 publications

(1 citation statement)

References 94 publications

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“…Tab. 1: Comparison between chipping production, SLE and µ-PBF [13][14][15][16][17][18][19] The advantage of both laser manufacturing processes is the contactless processing of materials. Due to the non-contact tool "laser", there are no restoring forces on the workpiece, so that, e.g., the holes for the prism rods can be placed closer together.…”

Section: Limits Of Chipping Production -Summary and Outlookmentioning

confidence: 99%

Fiber-based sensor for combustion chamber monitoring: manufacturing challenge

Grubert

Prochnau²,

Stollenwerk³

et al. 2023

MOEMS and Miniaturized Systems XXII

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The measurement of relevant process emissions is a challenging task, especially when access for measurement technology is limited. One example is the optical combustion chamber monitoring of internal combustion engines. The access is limited and spatial resolution for observation is limited by the possible use of optical elements in the combustion chamber. So far, data acquisition has been realized with the aid of spark plugs with integrated connections to an optical sensor. This optical spark plug has the function of a spark plug and simultaneously enables the detection of light in the engine. The optical spark plug is positioned in the center of the combustion chamber which allows for a symmetrical design for a 360° field of view. Our approach is to build an alternative fiber-based light sensor without the function of a spark plug, because if no ignition unit is installed, there is more space for additional optical elements for higher optical spatial resolution than conventional light sensors with ignition function. The main challenge is the miniaturization of the optical and mechanical set up. Due to the fixed position of the spark plug and the limited access to the combustion chamber, the light sensor must be inserted at an angle into the combustion chamber at a different location, so, the optical system must be asymmetric. This paper presents the results of the design and fabrication of a combustion chamber light sensor with respect to the optical and mechanical challenge of spatially resolved detection of light pulses in a combustion chamber of an engine under an oblique access to the combustion chamber.

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Section: Limits Of Chipping Production -Summary and Outlookmentioning

confidence: 99%

Fiber-based sensor for combustion chamber monitoring: manufacturing challenge

Grubert

Prochnau²,

Stollenwerk³

et al. 2023

MOEMS and Miniaturized Systems XXII

View full text Add to dashboard Cite

show abstract

An overview of strategies for identifying manufacturing process window through design of experiments and machine learning techniques while considering the uncertainty associated with

Cabrera,

Zouhri,

Zimmer-Chevret

et al. 2024

Int J Adv Manuf Technol

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Stainless and low-alloy steels additively manufactured by micro gas metal arc-based directed energy deposition: microstructure and mechanical behavior

Dornelas,

Farias,

da Silva

et al. 2024

Prog Addit Manuf

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Rising demands for miniaturization in industries such as aerospace and electronics have motivated advancements in metal additive manufacturing (AM), resulting in downscaled strategies using direct-energy deposition (DED) processes, now termed micro-DED (µ-DED). Within this context, micro gas metal arc DED (μ-GMA) has demonstrated the ability to deposit layers approximately 1 mm wide with a build rate of 30 cm3/h, positioning this technology between GMA-based DED and other µ-DED processes in terms of regarding dimensional accuracy and build rate. Despite promising initial results, further evaluation of the process impact on the microstructure and mechanical behavior of various alloys is necessary due to the pioneering nature of μ-GMA. The present work focuses on the evaluation of the microstructure (via scanning electron microscopy, energy dispersive spectroscopy, thermodynamic simulations, and electron backscatter diffraction analyses) and mechanical behavior (using nanoindentation maps) of single-layer depositions of low alloy and stainless steels using μ-GMA. In addition, traditional GMA-based DED using larger diameter wires was employed to deposit comparably alloys for further discussion. μ-GMA successively deposited a low-alloy steel with a microstructure composed of ferrite and martensite–austenite constituents, achieving a nanohardness (NH) of 3.1 GPa and an elastic modulus (NE) of 196 GPa. In addition, μ-GMA additively manufactured stainless steel with a microstructure composed of a γ matrix and δ-ferrite, exhibiting an NH of 3.7 GPa and an NE of 188 GPa. These results for both deposited materials are comparable to those reported in the literature for regular GMA-based DED depositions, indicating that this new variant has promising potential as a printing technology for small and detailed parts.

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Micro-metal additive manufacturing – state-of-art and perspectives

Cited by 6 publications

References 94 publications

Fiber-based sensor for combustion chamber monitoring: manufacturing challenge

Fiber-based sensor for combustion chamber monitoring: manufacturing challenge

An overview of strategies for identifying manufacturing process window through design of experiments and machine learning techniques while considering the uncertainty associated with

Stainless and low-alloy steels additively manufactured by micro gas metal arc-based directed energy deposition: microstructure and mechanical behavior

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