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55 巻, 7 号
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研究論文
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内村 勝次1983 年 55 巻 7 号 p. 399-405
発行日: 1983/07/25
公開日: 2011/12/13
ジャーナル フリーAn application of simple electrical resistance type moisture measuring apparatus was tried to measure moisture in reclaimed sand. Disturbance factors in the measuring process was quantitatively examined. Temperature, density and oolitic shell content of sand are important factors, while electric conduction materials such as graphite powders, pH of core sand, new sand addition, total clay and kinds of bentonite are of little significance. Important points in the moisture measuring process lie on temperature correction about 0.3 to 0.7 %/10°C and on check up the characteristics of the moisture measuring apparatus for particular system sand.抄録全体を表示PDF形式でダウンロード (657K) -
大和田野 利郎, 岸武 勝彦1983 年 55 巻 7 号 p. 406-411
発行日: 1983/07/25
公開日: 2011/12/13
ジャーナル フリーCarbon redistribution in the liquid ahead of planar and paraboloid interfaces of flake graphite cast iron unidirectionally solidifying was calculated. The fraction of carbon diffusion in the liquid f in eutectic solidification is related to the growth rate R, intergraphite spacing λ, diffusion coefficient of carbon in liquid D and undercooling at solidification front ΔTO as
fλR = 0.0032 DΔTO
This equation is approximately valid both for the planar and paraboloid interfaces at different temperature gradients. The calculated f decreases with a decrease in growth rate. This corresponds to the empirical fact that the paraboloid protrusions become more prominent with a decrease in growth rate. The fraction of carbon diffusion through austenite sheath 1-f in eutectic solidification increases by increasing the growth rate. The protrusions often appears on the slowly solidifying interface is attributed to a less undercooling at the interface where carbon diffuses both in liquid and austenite than that in liquid.抄録全体を表示PDF形式でダウンロード (601K) -
沢本 章, 大城 桂作, 松田 公扶1983 年 55 巻 7 号 p. 412-418
発行日: 1983/07/25
公開日: 2011/12/13
ジャーナル フリーEffects of 0.01 to 0.3%Ti addition and cooling rate on the morphology of vanadium carbide (VC) in 5 and 15%Cr cast irons containing C 2.5 to 3.0% and V 5 to 9% were studied. Molten metals were cast into an exothermic mold (30 mm φ×70 mm) placed on a water cooled copper chill and were solidified unidirectionally. Quenching in the freezing process was also made. Primary VC grows dendritically and eutectic VC dose in the shape of a fine rod in Ti free cast irons. Both primary and eutectic VC are nodularized by addition of Ti 0.02 to 0.3%. γ+VC eutectic cellular structure transforms into one with a number of VC particles dispersed throughout. The nodularity of VC is accelerated with an increase in Ti content. A number of tiny TiC particles crystallize before primary and eutectic VC do in cast irons to which Ti has been added. (100) of VC well conforms to (100) of TiC. VC therefore nucleates on the TiC particles and crystallizes as nodules.抄録全体を表示PDF形式でダウンロード (852K) -
倉部 兵次郎, 牧口 利貞, 村松 晃1983 年 55 巻 7 号 p. 419-425
発行日: 1983/07/25
公開日: 2011/12/13
ジャーナル フリーA reclamation process of sodium aluminate/CO2 bonded water-soluble alumina sand mold was investigated to improve a disagreeable working environment due to noise, vibration, dust and hot air on molding and shaking out. Mold sand CO2 hardened and the one heated up to 1,200°C is cleaned to a suitable state for reuse by scrubbing out in water for few min. In order to synthesize the binder, aluminum hydrate gel suspended in soluble water and washing water is reclaimed by thickening these water and subsequently by pressure-filtering aluminum hydrate slurry. Sodium hydrate solution is obtained by electrolyzing the dilute sodium carbonate solution of these water. Sodium aluminate as a binder is obtained by heating and condensing the sodium hydrate solution mixed with a suitable amount of aluminum hydrate as a binder at 100°C. A closed reclamation system for the water-soluble mold is proposed.抄録全体を表示PDF形式でダウンロード (650K)
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