Abstract
When we use the oil sand core, we have not coated on its surface. But in this case, various troubles have happened. So we coated on the oil sand core for preventing the blow hole chiefly in the bore part of Datsun cylinder block. In this report we mention the experiment of 23 kinds of coating materials. With the result we recognized that the following coating material is best in regard to the coating method, casting condition and machining condition. ① Graphite (Soil) 90% + Molasses 10% ② Graphite (Soil) 90% + Clay (Shimizu) 10% ③ Graphite (Soil) 90% + Bentnite 10%
In each case, we have used as 100% H2O Solution.
