Predicting Pattern Tooling and Casting Dimensions for Investment Casting, Phase III Page: 35 of 70
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3
.L 2.6
S2.2
1.8
1.4
a 1
(a)2.5
0 2.1
1.7
13
o 0.9
I 0.5
0 0 3.(b)
2b1 -0-Obl
-t -Ob2 - - -Figure 4.8: Alloy shrinkage factors for the (a) width dimension and (b) length dimension, L2-5.
4.2.4 Numerical Simulation Results for Casting Dimensions
Numerical simulations of heat transfer, solidification, and deformation during casting and subsequent
cooling were conducted with ProCAST (Waite and Samonds, 1990) using the casting parameters,
material properties, and boundary conditions given in the previous sections and Sabau (2005). The
mesh was created using the shelling feature in MeshCAST, a module of ProCAST (Fig. 4.9). One
mesh layer of 0.66 mm (0.026 in.) was used for the zircon face coat and another layer of 0.9 mm
(0.036 in.) for the intermediate fused silica coat. Three layers of 1.2 mm (0.048 in.) each were used to
model the fused silica back-up coats./1
,i
ii
i
I ' i
i
i
i
I
, ,(a)
(b)
L
(c)
Fig. 4.9. Casting configuration for numerical simulations: (a) alloy material,
and shell mold around the part; (b) part without cores, having unrestrained
deformation; (c) part with cores, with length and width dimensions are
partially constrained by cores.21
100 120 140 160
-O-0b -"- 2b1
-t-Ob20
20
40
60
80
Length (mm)
15
75 7.5 11.25
WIDTH (mm)/
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Sabau, Adrian S. & Cannell, Nick. Predicting Pattern Tooling and Casting Dimensions for Investment Casting, Phase III, report, December 24, 2007; United States. (https://digital.library.unt.edu/ark:/67531/metadc900737/m1/35/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.