Abstract
The mould or the core in contact with molten steel usually changes its volume because of the expansion of sand grains, and they collapses after the bond is destroyed by heat. The effect of wood flour added to sands on steel casting was studied. The results are summarized as follows : 1) The wet strength of the moulding sand is reduced by the addition of wood flour, therefore its content should be limited below 3 per cent. 2) The dry strength of the moulding sand depends upon the drying temperature and drying period. 3) It is observed that 2 per cent of the added materials gives good results. 4) The expansion of the moulding sand at a high temperature is decreased notably when 2 per cent of wood flour is added. 5) These results have been successfully applied in the foundry shop practice.
