Projection Microstereolithography as a Micro-Additive Manufacturing Technology: Processes, Materials, and Applications

Srivatsan, T. S.; Sudarshan, T. S.

doi:10.1201/b19360-9

Cited by 4 publications

(7 citation statements)

References 89 publications

(115 reference statements)

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“…To verify the results obtained from the optimization model, an extension of the graphical approach developed by Paul (Paul, 2013) and Paul and Anand (Paul and Anand, 2014) can be adapted for the orientation tolerances as well, as shown in Figure 16.…”

Section: Resultsmentioning

confidence: 99%

“…This section extends Paul (Paul, 2013) and Paul and Anand's (Paul and Anand, 2014) one dimensional tolerance maps to orientation tolerances. Assuming that a given AM part feature has a perpendicularity tolerance specification (Ɛ sp_per ), a parallelism tolerance specification (Ɛ sp_para ) and an angularity tolerance specification of (Ɛ sp_ang ), then for a fixed slice thickness, there exists two orientations where the tolerance errors will be exactly same as the specified callout, as depicted in equations 9, 10 and 11. , …………..……... (9) , ..……………… (10) , …...………...….…”

Section: Mapping Of Build Orientations For the Errorsmentioning

confidence: 98%

“…For a feature constructed around a datum axis, the Total Runout error (Ɛ tot_runout ) is the measure of the total deviation of the entire surface for that particular feature from the datum axis (Paul, 2013), (Ramaswami et al, 2011). Figure 7 shows the Total Runout error.…”

Section: Relation Between Tolerance Errors and Build Orientationmentioning

confidence: 99%

“…Circular Runout error (Ɛ cir_runout ) determines the deviation of a feature at a certain cross section, normal to the datum axis (Ramaswami et al, 2011), (Paul, 2013) as seen in Figure 8. The cross section is assumed to be of very small thickness.…”

Section: Relation Between Tolerance Errors and Build Orientationmentioning

confidence: 99%

“…Relationship between Cylindricity error (Ɛ cyl ) and build orientation was addressed by Paul (Paul, 2013) and Paul and Anand (Paul and Anand, 2014) as shown in equation 2, Ɛ cyl = ∆z sin (ϴ cyl ) ……………………………….……… (2) where, ϴ cyl is the angle between the axis of the cylinder with cylindricity tolerance and build direction.…”

Section: Relation Between Tolerance Errors and Build Orientationmentioning

confidence: 99%

See 4 more Smart Citations

Optimum Part Build Orientation in Additive Manufacturing for Minimizing Part Errors and Support Structures

Das

Chandran

Samant

et al. 2015

Procedia Manufacturing

157

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Additive Manufacturing (AM) is the process of part building by stacking layers of material on top of each other. Various challenges for a metal powder based process include reducing the staircase effect which leads to poor surface finish of the part, and minimal use of support structures for regions with overhangs or internal hollow volumes. Part build orientation is a crucial process parameter which affects part quality, in particular, Geometric Dimensioning & Tolerancing (GD&T) errors on the part, the energy expended and the extent of support structures required. This paper provides an approach to identify an optimal build orientation which will minimize the volume of support structures while meeting the specified GD&T criteria of the part for a DMLS based process. Siemens PLM NX API is used to extract the GD&T callouts and associated geometric information of the CAD model. The regions requiring support structures are identified and a Quadtree decomposition is used to find the volume of support structures. The mathematical relationships between build orientation and GD&T are developed as part of a combined optimization model to identify best build orientations for minimizing support structures while meeting the design tolerances. The feasible build orientations along with the corresponding support structures are depicted using a visual model.

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Section: Resultsmentioning

confidence: 99%

Section: Mapping Of Build Orientations For the Errorsmentioning

confidence: 98%

Section: Relation Between Tolerance Errors and Build Orientationmentioning

confidence: 99%

Section: Relation Between Tolerance Errors and Build Orientationmentioning

confidence: 99%

Section: Relation Between Tolerance Errors and Build Orientationmentioning

confidence: 99%

See 3 more Smart Citations

Optimum Part Build Orientation in Additive Manufacturing for Minimizing Part Errors and Support Structures

Das

Chandran

Samant

et al. 2015

Procedia Manufacturing

157

View full text Add to dashboard Cite

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A New and Efficient Multi‐Scale Simulation Architecture for Prediction of Performance Metrics for Parts Fabricated Using Additive Manufacturing

Pal¹,

Stueker²

2015

TMS2015 Supplemental Proceedings

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The effects of material property assumptions on predicted meltpool shape for laser powder bed fusion based additive manufacturing

Teng¹,

Ashby²,

Phan

et al. 2016

Meas. Sci. Technol.

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The objective of this study was to provide guidance on material specifications for powders used in laser powder bed fusion based additive manufacturing (AM) processes. The methodology was to investigate how different material property assumptions in a simulation affect meltpool prediction and by corrolary how different material properties affect meltpool formation in AM processes. The sensitvity of meltpool variations to each material property can be used as a guide to help drive future research and to help prioritize material specifications in requirements documents. By identifying which material properties have the greatest affect on outcomes, metrology can be tailored to focus on those properties which matter most; thus reducing costs by eliminating unnecessary testing and property charaterizations. Futhermore, this sensitivity study provides insight into which properties require more accurate measurements, thus motivating development of new metrology methods to measure those properties accurately.

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Projection Microstereolithography as a Micro-Additive Manufacturing Technology: Processes, Materials, and Applications

Cited by 4 publications

References 89 publications

Optimum Part Build Orientation in Additive Manufacturing for Minimizing Part Errors and Support Structures

Optimum Part Build Orientation in Additive Manufacturing for Minimizing Part Errors and Support Structures

A New and Efficient Multi‐Scale Simulation Architecture for Prediction of Performance Metrics for Parts Fabricated Using Additive Manufacturing

The effects of material property assumptions on predicted meltpool shape for laser powder bed fusion based additive manufacturing

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