鋳型用珪砂の細粒度域における焼着性について

抄録

  At their different grain sizes and sorts our investigation has been made on the penetration and fusion of four kinds of Foundry Silica Sand, Synthetic Silica Sand. Conical Silica Sand, Natural Silica Sand and Beach Sand in Tokai district which are used in great abundance now in the Foundry Industry of Japan.
  It has clarifyed by our investigation that each of these four kinds of Silica Sands has a remarkable property in the respect of the penetration and fusion according to its peculiar crystal structure, the difference of which is caused peculiar crystal structure, the difference of which is caused from its geological origin and manufacturing method.
  Our Conclusion is as follows:
  1. Foundry Silica Sands have their respective range of grain size where their burning changes from penetration to fusion, and this range is different according to the property of each sand, respectively.
  2. It can be said that Foundry silica sand has the lowest burning ability in this range of gram size.
  3. The critical range of Beach Sand exists in larger grain size, that of Synthetic Silica Sand at smaller grain size and those of Conical and Natural Silica Sands at medium grain size.
  4. With the larger grain size Natural Silica Sand shows the least burning property, Beach Sand 2nd, Conical Silica Sand 3rd, and Synthetic Silica Sand the biggest. With the smaller grain size Synthetic Silica Sand shows the least burning property, Conical Silica Sand 2nd, Natural Sand 3rd and Beach Sand the biggest.
  5. For the Combination and preparation of molding sand of larger grain size, is most suitable and Synthetic Silica Sand or Conical Silica Sand of small grain size most suitable.