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Influence of pouring temperature on castings

Issuing time:2020-06-26 14:54Author:momo

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castings


The pouring temperature has a great influence on the quality of castings, but it is often overlooked by the casters. In particular, some small and medium-sized foundries are not equipped with thermometers,   somefoundries are equipped with thermometers but because of the lack of an effective temperature measurement management system, the furnace workers lack professional basic knowledge, andtheir control of the molten iron temperature depends on their feelings. This caused a huge deviation between the temperature of the molten iron and therequired temperature of the castings, resulting in a large number of scrap castings, causing comparative losses to the foundry.


So, what are the casting defects that a rise under different conditions and at different pouring temperatures


What defects will occur when the pouring temperature is higher than the casting composition?When the casting temperature is higher than the required composition of the casting, shrinkage cavities and shrinkage defects are likely to occur, causing insufficient self-compensation of the cast iron. This situation is particularly evident on thicker castings. Therefore, on castings with a wall thickness of more than 20 mm, the pouring temperature must be controlled below the casting's required range.

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shrinkage


If the casting temperature of the casting is low, what product defects will occur? Low pouring temperature will cause cold partition, insufficient pouring, slag holes,manganese sulfide pores, etc. This is because the temperature of the molten iron is low and the molten iron cools down quickly. After the molten iron ispoured into the model, the temperature is already lower than the casting requirements. The molten iron cannot be cast into the mold completely,resulting in insufficient pouring. In addition, the low temperature of the molten iron will also stop the slag in the molten iron from fully floating to the surface of the molten iron, resulting in unclean slagging, thus leaving the casting with slag holes. The melton metal temperature is low, which is the most harmful to the castings with thinner wall thickness. If the pouring temperature is not adjusted well for thin-walled castings under 5 mm , various defects will occur.


So, how to determine the appropriate casting temperature? It can be said that each casting must have the most appropriate pouring temperature, and to find the appropriate pouring temperature, our casting technicians must keep repeating preliminary tests, comparative analysis, and data analysis.



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