The cold box method refers to a resin sand forming process that is catalyzed/hardened by blowing in gas or aerosol, and formed instantaneously at room temperature. The common method is the triethylamine method, which uses phenolic-urethane resin and is hardened by blowing triethylamine gas. The characteristics of this process are: the core sand can be used for a long time, the mold-drawing time is short, the production efficiency is high, and the energy consumption is low.
Diesel engine castings, such as cylinder blocks, cylinder heads, intake and exhaust pipes, etc., some have complex core shapes and small partial cross-sectional areas, which are prone to false shots, fractures, etc., or veins appear in the castings due to the large expansion of silica sand. The probability of defects such as sticky sand and pores is also relatively high.
Using ceramic sand or mixing ceramic sand and silica sand in proportion, the amount of resin added is reduced by 20-30%, and the above defects have been significantly improved. At the same time, the sand core has good collapsibility, which reduces the workload of casting cleaning. As a result, more and more diesel engine casting foundries have adopted ceramic sand cold core box technology.
|Main Chemical Component||Al₂O₃≥53%, Fe₂O₃＜4%, TiO₂＜3%, SiO₂≤37%|
|Partical Size||45μm -2000μm|
|Bulk Density||1.5-1.6 g/cm3|
|Mineralogical Composition||Mullite + Corundum|
|Acid Cost||＜1 ml/50g|
|Raw Sand||Resin Add.||2h Tensile Strength||Gas Evolution|
|Sintered Ceramic Sand||1.5%||2.098 MPa||10.34 ml/g|
|Scrubbed Sand||1.5%||1.105MPa||13.4 ml/g|
|Baked Sand||1.5%||1.088 MPa||12.9 ml/g|
|Sintered Ceramic Sand+ Scrubbed Sand||1.5%||1.815 MPa||12.5 ml/g|
|Sintered Ceramic Sand+ Baked Sand||1.5%||1.851 MPa||12.35 ml/g|
|Chromite Sand+ Scrubbed Sand||1.5%||0.801 MPa||10.85 ml/g|
|Chromite Sand+ Baked Sand||1.5%||0.821 MPa||10.74 ml/g|
|Raw Sand||Veins||Core Broken||Sinter||Choke||Total|
|Sintered Ceramic Sand||0%||2%||0%||0||2%|
|Sintered Ceramic Sand+ Scrubbed Sand||12%||4%||1%||2%||19%|
|Sintered Ceramic Sand+ Baked Sand||7%||3%||2%||2%||14%|
|Chromite Sand+ Scrubbed Sand||13%||6%||5%||4%||28%|
|Chromite Sand+ Baked Sand||12%||4%||2%||2%||20%|
The particle size distribution can be customized according your requirement.