China cerabeads for shell mold casting

Casting Name:508 Machine base

Casting Weight:150Kg

Material: QT450-10

Pouring Temperature:1420-1440℃

Work Process

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Make Core

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Closed box

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Closed box

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Install the pouring cup

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Pouring

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Pouring

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Open box

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Open box

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Open box

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Clearing the mold

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Clearing the mold

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Clearing the mold

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Cold the mold

Compare with the silica sand

2.1 Index comparison of shell mold coated sand

Test Item

Silica sand

Ceramic sand

Hot bending strength (MPa)

2.3

2.0

Room temperature tensile strength (MPa)

4.5

5.3

Melting point (℃)

96

96

Gas evolution (ml/g)

15.2

12.1

L.O.I(%)

2.88

2.21

Breathability(Pa)

130

150

Particle Size (AFS)

64.3

66.2

High temperature and pressure time (S)

83

98

Bulk Density(g/cm3)

1.55

1.57

linear expansion rate (%)

1.05

0.10

2.2 Comparison of castings

High strength silica sand total made 21 pcs castings, two pcs scrap castings due to the sand core fractured and molten iron penetration, scrap rate is 9.5%. Ceramic sand total made 14 pcs castings, no one scrap.

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Scrap castings

Details

High-strength silica sand (p): Poor surface finish of castings and veining defects on the inner wall
Kaist Ceramic sand (t): The inner wall of the casting surface is relatively smooth, without defects such as veining

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High-strength silica sand

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Kaist Ceramic sand

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Kaist Ceramic sand

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High-strength silica sand

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High-strength silica sand

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High-strength silica sand

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High-strength silica sand

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High-strength silica sand

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Kaist Ceramic sand

Conclusion

In Shell mold coated sand casting, compare with high strength silica sand, Kaist Ceramic foundry sand has the advantages of high strength, low gas evolution, good air permeability, long high temperature resistance time, low expansion, etc., it’s castings are not scrapped, the surface finish is improved significantly, and veining defects are completely improved.


Post time: Dec-30-2021