形状複雑な遠心鋳鋼品の内壁多孔層の態形とピンホールについての一考察

概要

論文の詳細を見る
The quality of the porosity layery of inner wall which influences upon the reduction of working time, as well as the pinholes which influence on good or bad of the commercial castings are important matters in the production of centrifngal steel of complicated forms. Authors has investigated on these subjects for various parts of the rock drills, and particulaly an inspection by X-ray was applied on the pinholes of the centrifugal castings of proper wall thickness. The results were obtained as follows, (1) The state of porosity layers of inner wall consist of non-metalic inclusions and gases included in the molten steel, and these are apt to concentrate in the thick part of the wall or in its vicinity. But the amount and the location of them are different according to the revolutions per minute (or times gravity, G). IT is important to decide the inner diameter economically in the centrifugal castings of complicated form. (2) The pinholes are apt to appear in the parts of thin wall thickness. The caus of is supposed to be due to more rapid rate of solidification than removing speed of H2 gas to the inner wall. Wall thickness which will be able to control more or less pinholes is considered to be 18∼13mm.
Japan Foundry Engineering Societyの論文