In recent years, foam ceramic filtration technology has been widely applied in foundry production and has become the simplest and effective method to improve the mechanical properties of castings and reduce porosity and inclusions. But do you know how to choose the foam ceramic filters? If it is selected improperly, it will not achieve the expected effect but will bring more trouble to the casting production, and even increase the scrap rate of castings. Therefore, rational selection and proper use of foam ceramic filters in casting production is a problem faced by foundry manufacturers.
The porosity of the ceramic foam filter is selected according to the type of cast iron to be filtered. Generally, 10ppi is used for ductile iron; 20ppi is used for gray cast iron; 30ppi is used for malleable casting; the filter area is determined according to the weight of the filtered cast iron.
The filter has two capabilities. To get a satisfactory result, it must meet:
①Metal filtration capacity; ②Metal flow capacity.
The filtering capacity per unit area ranges respectively: gray iron 2.0～3.8 kg/cm2, ductile iron 1.0～2.0 kg/cm2, cast steel 1.0～2.0 kg/cm2 (data as reference), according to different casting material elements and purity of molten metal The degree and so on have changed.
According to the application conditions, pouring temperature, weight, and pouring time, choosing a reasonable filter size specification model can ensure the safety of the filter product application.