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52 巻, 7 号
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研究論文
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鈴木 克美, 加山 延太郎1980 年 52 巻 7 号 p. 389-393
発行日: 1980/07/25
公開日: 2012/03/28
ジャーナル フリーThe dissolution behavior of graphite added in the cast iron melt was studied and the influence of sulfur content on this behavior was discussed. A graphite piece floating on the surface of the melt becomes harder to dissolve as the sulfur content increases. There is greater erosion of the graphite bar inserted in the melt with increasing sulfur content and eroded graphites disperse into the melt as small lump-like particles. The dispersion of graphite begins with the cleavage of basal planes of graphite crystals. As this process advances, sulfur acts disperse coarse particles and disturbs their subdivision resulting in prolonging the life of the remaining graphite. This is due to the adsorption of sulfur on the prism plane of the graphite crystal which increases the bonding energy between each basal plane.抄録全体を表示PDF形式でダウンロード (719K) -
湯浅 栄二, 師岡 利政1980 年 52 巻 7 号 p. 394-399
発行日: 1980/07/25
公開日: 2012/03/28
ジャーナル フリーSome foundry techniques for adding nickel-coated graphite particles to molten aluminum alloys were investigated. The first method was that of introducing graphite particles by injecting argon gas stream from the bottom of the moten bath (injecting method). The second method was that of plunging pellets prepared from a mixture of aluminum powder and graphite particles into the melt (pellet method) and the third method was that of pouring graphite particles directly into a deep vortex of the melt created by an impeller mixer in the melt (vortex method). The vortex method was judged to be the most suitable technique of graphite dispersion for the small scale production of graphite-aluminum alloys. Using the vortex method, up to 17wt% graphite can be dispersed into the aluminum alloy. Coarse graphite particles (420−840μm) with continuous nickel coating of about 6μm thickness ware successfully introduced into the melt of Al-Si alloys. Optimum mixing temperature of the melt for addition was about 50°C higher than the liquidus of the alloy. There is a floatation of the graphite particles in sand mold casting, but a uniform distribution of the particles is obtained in the water-cooled chill casting.抄録全体を表示PDF形式でダウンロード (842K) -
辻川 正人, 森 崇, 池永 明, 岡林 邦夫1980 年 52 巻 7 号 p. 400-404
発行日: 1980/07/25
公開日: 2012/03/28
ジャーナル フリーSpheroidal graphite cast iron and graphite steel with ferritic matrix structure have relatively good strength and elongation under static load but do not have as good an impact strength. In order to prevent the lowering of impact strength, graphite nodules ware surrounded by a second phase, which was harder than the ferritic matrix. The volume fraction (Vf) and hardness of the second phase were varied by heat treatment and their effects on the impact properties were examined. It was found that, when the tempered sorbite of Vf 0.1−0.3 was introduced around graphite nodules, although the hardness increased considerably the decrease in the impact strength was not as large as when the bull's eye structure was introduced.抄録全体を表示PDF形式でダウンロード (713K) -
山本 治, 青木 修三, 斎藤 誠宏1980 年 52 巻 7 号 p. 405-410
発行日: 1980/07/25
公開日: 2012/03/28
ジャーナル フリーThe difference in the rebonding behavior of residual binder film on reclaimed sands derived from furan and phenol cold-setting binders is discussed from the point of view of wettability and adhesive force of the binders. Furan binder exhibits stronger adhesive force between the new and residual binder interface, and easily makes the residual binder surface wet compared to phenol binders. This is the reason why twenty-four hour compressive strength obtained from the reclaimed furan-resin-bonded sand is higher than that of the reclaimed phenol-resin-bonded sand.抄録全体を表示PDF形式でダウンロード (655K) -
久保 公雄, 福迫 達一, 大中 逸雄1980 年 52 巻 7 号 p. 411-417
発行日: 1980/07/25
公開日: 2012/03/28
ジャーナル フリーPermeability of the Vacuum Process Mold, which is an important factor in considering casting defects and strength of the mold, was measured by a steady flow method. When the Reynolds number was under 4.5, the air flow in the mold was laminar and the mean flow rate varied linearly with the suction pressure. The Kozeny-Carman's equation could be applied in this case. When the Reynolds number was above 4.5, the flow was turbulent. In this case, the ratio of the suction pressure to the mean flow rate varied linearly with the mass-flow rate, and Ergun's equation could be applied. In addition, it was found that the coefficient of angularity was minimum in silica sand of 0.03 cm diameter and mold density was increased by decreasing the coefficient of angularity. The permeability and the coefficient of angularity of silica sand of different sizes could be calculated by using the mean diameter recommended by Kunii.抄録全体を表示PDF形式でダウンロード (661K)
技術報告
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大内 康弘, 河部 昭雄1980 年 52 巻 7 号 p. 426-431
発行日: 1980/07/25
公開日: 2015/01/27
ジャーナル フリーPDF形式でダウンロード (3540K)
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