中子の粘結劑に關する研究(I)

概要

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Nowaday, some kinds of oil, resins and corn flours et al. are used as core sand binders to obtain desired properties of the core. But these core have weak strength in green sand state. The authers have studied how to strengthen the green sand as well as the baked sand and to improve the permeability. The results were as follows : 1. The strength of the baked sand in compression and bond test was excellent when dextlin, linseed oil and novolack were added each alone to the sand. The strength of green sand was greatly improved by adding rubber chloride, dextlin and novolack. In the case that two or more kinds of binders were mixed with the sand, high strentgh was obtained when novolack, resin or dextlin was added in combination with 4% of linseed oil, and excellent strength was obtained when 2% of linseed oil, 2% of novolack, 1% of resin and 1% of dextlin were added te the sand. 2. Permeability of the baked sand has opposite inclination to the strength. Resin, vernish, pitch and novolack decreased the permeability of the sand in this order, but those values of permeability showed good results when baked at 200∿250℃. The addition of two or more kinds of binders decreased permeability not so greatly. Compression strain was maximum at the baking temperature of 200∿250℃.
社団法人日本鉄鋼協会の論文
1953-01-25