抄録
Deffects caused by warpage or moisture in sand mold were investigated especially in castings for loom and spinning machine parts. These investigation led us to find some suitable remedies as follows for prevention of deffects.
a) So many conditions affect on the warpage in castings, it is too difficult removing the warpage perfectly. From the results obtained, it was clarified that using pattern design considering this kind of warpage or taking a foundry method in this paper are considerably useful to remove the warpage in casting.
b) A bad condition of surface and growth of gas holes in casting will depend a great deal upon the moisture in sand mold. It has been shown that the less the moisture content, the more easily the sound casting is gotten. To the castings in our case, however, the moisture content 11 percent is seems to be the best one. (N. T.)
