Analysis of shell cracking in investment casting with laser stereolithography patterns

Yao, Wu-Sung; Leu, Ming C.

doi:10.1108/13552549910251837

Cited by 36 publications

(17 citation statements)

References 1 publication

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“…Most RP materials have CTE values that are larger than the ceramic material and as such, the expansion of the pattern during heating imposes significant amounts of stress on the ceramic shell. Shell cracking occurs when the stresses imposed by the expanding pattern are greater than the modulus of rupture (MOR) of the shell material [11]. In some cases, residual ash can also cause defects in the final castings when present in relatively significant quantities.…”

Section: Rapid Investment Casting Processesmentioning

confidence: 99%

Rapid investment casting: direct and indirect approaches via fused deposition modelling

Lee

Chua

Cheah

et al. 2004

The International Journal of Advanced Manufacturing Technology

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Investment casting (IC) offers an economical method for mass producing complex, shaped metal parts. However, high tooling cost and lead times associated with the fabrication of metal moulds for producing IC wax (sacrificial) patterns result in cost justification problems for customised single casting, small-and medium-quantity production. Rapid prototyping (RP) techniques can reduce the costs associated with single-part or small-quantity production as they can be applied to the fabrication of sacrificial IC patterns containing complex and intricate designs with significant cost and lead-time savings. In this project, a benchmark model is designed to assess the fused deposition modelling (FDM) process for creating sacrificial IC patterns. In addition, an indirect approach toward producing wax patterns via silicone rubber moulding is investigated. Cost and lead time comparisons between the two IC pattern production methods were carried out and presented. The dimensional accuracies of metal castings generated from the RP-produced patterns are also presented.

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Section: Rapid Investment Casting Processesmentioning

confidence: 99%

Rapid investment casting: direct and indirect approaches via fused deposition modelling

Lee

Chua

Cheah

et al. 2004

The International Journal of Advanced Manufacturing Technology

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“…The properties for ABS materials and ceramic shells are shown in Table 1. [7]. For easing analysis, isothermal thermal condition loading represent the heating process from 0 ℃ 700℃ with 5°C rise for each step.…”

Section: Methodsmentioning

confidence: 99%

Direct Investment Casting Numerical Study for ABS P400 FDM Materials

Marwah

Sharif²,

Sulaiman

et al. 2014

AMM

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Abstract. The purpose of this paper is to study the collapsibility of internal structure for Acrylonitrile butadiene styrene (ABS) P400 materials as a sacrificial patterns in investment casting(IC) . Two different internal patterns structure which consist hollow and square 90° were performed by Insight software . Experiment were perform by applying 3D coupled thermal mechanical finite element analysis on cube ceramic shell during burnout stage. As numerical observation the deformation stress for cube square 90° and hollow models have been evaluated by increasing the temperature during heating up to 700℃. It is found that both pattern start to buckling over the autoclave temperature throgh simulation observations and shows no cracking defect occured at ceramic mould.

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“…QuickCast replaces solid geometries with triangular shells. As a result, the hollow sacrificial pattern melts and collapses inwards eliminating thermal stresses due to expansion [17].…”

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confidence: 99%