Casting Name：508 Machine base
Casting Weight：150Kg
Material: QT450-10
Pouring Temperature:1420-1440℃
Work Process
Make Core
Closed box
Closed box
Install the pouring cup
Pouring
Pouring
Open box
Open box
Open box
Clearing the mold
Clearing the mold
Clearing the mold
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.
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
High-strength silica sand
Kaist Ceramic sand
Kaist Ceramic sand
High-strength silica sand
High-strength silica sand
High-strength silica sand
High-strength silica sand
High-strength silica sand
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