Solid Freeform Fabrication: A New Direction in Manufacturing

Beaman, Joseph J.; Marcus, Harris L.; Bourell, David L.; Barlow, J. W.; Crawford, Richard H.; McAlea, Kevin P.

doi:10.1007/978-1-4615-6327-3

Cited by 298 publications

(171 citation statements)

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“…This greatly reduces the production cycle time, and tremendously contributes to quality, competitiveness, and reduction in maintenance cost [1]. Generally the layer manufacturing technology does not require pre-formed mandrel or tooling; instead, it builds physical objects directly from computer image data and it constructs the three dimensional object layer by layer [2].…”

Section: Introductionmentioning

confidence: 99%

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Determination of Operation Condition and Product Dimension Accuracy Optimization of Filament Deposition Modelling on Layer Manufacturing Application

Widyanto¹,

Tontowi²,

Jamasri³

et al. 2010

MST

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Layer manufacturing process has proven as a process that can produce a high complexity mechanical part. Now, Improvement of LM methods continuously conduct that is aimed to increase precessions and efficiency of these processes. Pressure filament deposition modelling is a form of layer manufacturing process that is designed to produce a plastic part with controlling its semisolid phase. In this research, the equipment of filament depositor is designed and tested to make the product filament deposition. With operation condition observation, the optimal temperature and pressure of deposition process was determined. These experiments used PVC as crystalline material and polypropylene as amorphous material. To optimize this process, the tensile strength and density test were conducted. The shape of tensile test specimens is based on ASTM 638 standard and made in 3 orientations deposition path, namely: in 0 degree, 45 degree and 90 degree from load force axis. To found the most accurate dimension, controlling the time delay, temperature of build part, feeding speed and variation deposition path was conducted. The results of experiments show that the filament deposition method can only be applied for amorphous material in which it has a semisolid phase. From the tensile strength test, the binding strength among filaments is 0.5 kg/mm 2 , 20% of the tensile strength of filament. And the density of a sample product, which used the filament diameter of 0.8 mm, is 0.7668 g/cm 3 . Accuracy of product dimension can be increased by: controlling time delay in location where the motion orientation of hopper filament is changed and controlling temperature of build part surface.

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Section: Introductionmentioning

confidence: 99%

“…Beaman et.al. [2] had developed a Filament deposition method (FDM). The FDM system uses a resistively heated delivery head to melt thermoplastic wire-like filaments.…”

Section: Introductionmentioning

confidence: 99%

Determination of Operation Condition and Product Dimension Accuracy Optimization of Filament Deposition Modelling on Layer Manufacturing Application

Widyanto¹,

Tontowi²,

Jamasri³

et al. 2010

MST

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“…The application of RP-fabricated patterns as substitutes for the traditional wax patterns employed in IC stems from the fact that RP materials can be melted and burned out from the ceramic shell (ceramic shell casting) without damaging it (Beaman et al [2]). Most commercialized RP techniques are capable of producing such patterns that can be used directly in IC.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of ABS patterns produced from FDM for investment casting process

Harun

Safian

Idris

2009

WIT Transactions on Engineering Sciences

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The paper presents the investigation of the Acrylonitrile Butadiene Styrene (ABS) pattern produced from Fused Deposition Modeling (FDM) for use as a pattern for an investment casting process. The investigations were carried out to establish the physical and collapsibility characteristics of an H-shape pattern produced from two different construction methods, i.e. hollow and solid, using rapid prototyping FDM2000 machine. Surface roughness, dimensional accuracy and distortion were evaluated to establish the physical characteristics of the pattern constructed. Results on surface roughness showed no significant variation between hollow and solid constructed patterns. As for dimensional accuracy, hollow patterns produced better accuracy compared to solid patterns. However, the result on distortion shows that hollow constructed patterns experienced 33.11% higher than solid constructed patterns. For collapsibility investigation, shell investment casting mould built from the two different pattern construction methods were fired to a temperature ranging from 300°C to 600°C. The moulds were weighted at a predetermine temperature intervals to establish the collapsibility characteristic of the patterns. ABS (P400) was found feasible to be used as an investment casting pattern material. Hollow pattern construction proved to be more viable than solid pattern construction in terms of dimensional accuracy, mould cleanliness, pattern collapsibility and no mould cracking at all temperatures.

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“…Various embodiments of this method, called layered manufacturing, or solid freeform fabrication (SFF), are commercially available and well publicized. 1 The majority of SFF processes employ material-deposition strategies ranging from laser-induced curing of monomers, to selective deposition of metal and polymeric powders, to laser fusion of streams of metal powders. Some SFF technologies combine material addition with material-removal strategies such as computer numerical control (CNC)…”

mentioning

confidence: 99%