鋳物砂の焼着の研究（第1報）

―砂型中での液体金属の滲透速度―

抄録

  The velocity of metal penetration in sand mould is investigated, by contacting the sand specimen to the surface of molten lead and tin, which are kept at constant temperatures, and applying negative pressure to the specimen for penetration. The sand specimen is prepared by baking sieved silica sand mixed with linseed oil as a binder, The results are as follows :
  1. The depth of metal penetration, x, is related to the time of penetration, t₂ as
            x=α√t+β
  where α and β are constants.
  2. The coarser the sand and the larger the penetration pressure, the larger the β. The effect of penetration pressure on β is large in coarse sand.
  3. α, which determines the velocity of penetration, is independent of the size of sand grains and penetration pressure, but dependent of the temperature of the metal to penetrate, i. e., the higher the metal temperature, the larger the α.
  4. αs obtained by experiments are much larger than those expected by previous investigators. This discordance is attributable to the large heat conductivity of the penetrated zone in comparison with that of the sand. The results of calculation of α, in which the thermal constants of penetrated zone and the sand are used, are in better accordance with the αs obtained by the experiments.