巻号一覧
後続誌
53 巻, 1 号
選択された号の論文の6件中1～6を表示しています
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研究論文
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松田 政夫, 北村 真1981 年 53 巻 1 号 p. 3-8
発行日: 1981/01/25
公開日: 2012/02/16
ジャーナル フリーAs the temperature of semi-liquid alloy is lowered, some of the liquid alloy turns into fine grains and they grow at temperatures between the liquidus and solidus. The sectional temperature distribution of the leading tip at each flow stage is obtained by the numerical calculation satisfying the heat balance between the heat loss by heat transfer and the latent heat of solidification at solidus isotherm at the boundary of the solidified layer. Fluid life is obtained through experimental pouring into the cylindrical sand mold cavity. Flow of gray cast iron suddenly ceases when the fraction of solid concentration at the center of the tip becomes 0.25 or less. The Al-Si-Mg alloy ceases flowing in the way different from gray iron. If the semi-liquid aluminum alloy is pressurized, it continues to flow to some degree even at solidus.抄録全体を表示PDF形式でダウンロード (643K) -
岡田 明, 三宅 秀和, 尾崎 良平1981 年 53 巻 1 号 p. 9-14
発行日: 1981/01/25
公開日: 2012/02/16
ジャーナル フリーFe3C in white cast iron of Fe-C system fuses at 1,143°C as Fe3C eutectic without graphitization of the Fe3C even at a slow heating rate 0.625°C/min. Graphite eutectic solidifies in the melt. The amount of the solidifying eutectic decreases as the heating rate is speeded up. This eutectic fuses at 1,153°C. The graphite structure in grey iron hardly changes by heating, and only the melting of graphite eutectic is detected on the differential thermal analysis curve. Parts of Fe3C eutectic and graphite eutectic in mottled iron behave as independent white and graphite irons. Fe3C in white iron of Fe-C-Si system containing Si up to 0.12% fuses as Fe3C eutectic without being graphitized. The amount of the fusing Fe3C eutectic decreases with 0.17% Si, because graphitization of the Fe3C increases with the decreased heating rate. The amount of graphite eutectic solidified in the melt increases. Fe3C is completely graphitized with Si 0.39% or more even at the high heating rate 20°C/min. The graphitization of Fe3C occurs at lower temperatures as Si is increased and the heating rate is reduced. The graphite particles become finer and increase in number as the Si content and heating rate increase.抄録全体を表示PDF形式でダウンロード (927K) -
蓑輪 晋, 二宮 三男, 太田 英明1981 年 53 巻 1 号 p. 15-19
発行日: 1981/01/25
公開日: 2012/02/16
ジャーナル フリーThe amount of deformation and the force for pattern drawing of frozen sand molds containing bentonite or ferro-silicon dust (SiO2 content ; about 85%) which has a subsidiary binding effect with moisture were investigated. The frozen sand mold containing bentonite 2 to 6% and moisture several percents considerably shrinks at freezing, but one containing ferro-silicon dust in place of bentonite shrinks a little. The resistant force for pattern drawing has a relation to the amount of deformation of the mold. The resistant force is remarkably reduced by adding such materials that drop the freezing point of water.抄録全体を表示PDF形式でダウンロード (566K) -
上田 俶完, 谷 耕治1981 年 53 巻 1 号 p. 20-25
発行日: 1981/01/25
公開日: 2012/02/16
ジャーナル フリーFe-25%Cr-12%Ni cast steel was tested by EPMA and X-ray diffraction. Protective scale layers of Fe2O3 and Cr2O3 are gradually formed when free from hot wear. Some cracks are found along the grain boundary and oxidation proceeds along it. These oxide layers are broken up and the internal oxidation also proceeds markedly under the wear of hot cement clinker. Cr and Mn oxides found at the crack end are surrounded by Mn sulphide. This phenomenon may be the sulphidic oxidation suggested by Simons et al. Some unsurrounded internal oxides are also found. When the alloys are oxidized in air at 1,173 K, a Si oxide layer is developed under the Cr2O3 layer and is pegged into the alloys containing RE 0.2 and 1.0%. RE has little effect on the X-ray diffraction pattern of these oxides. When the alloy on which the oxide layer has been formed is held in the cement clinker at 1,173 K. S swarms either onto the oxide surface or into the crack in the oxide, but hardly diffuses into the oxide. Ca easily diffuses.抄録全体を表示PDF形式でダウンロード (858K) -
田中 雄一, 菊地 千之, 井川 克也1981 年 53 巻 1 号 p. 26-31
発行日: 1981/01/25
公開日: 2012/02/16
ジャーナル フリーThe tool life and cutting force required for machining pearlitic spheroidal graphite cast iron were tested using two grades of cemented-carbide tools. The cast iron cutting grade carbide (K-10) is much superior to the steel and steel-casting cutting grade carbide (M-20) from the standpoint of tool life and metal removal rate. When the spheroidal graphite cast iron with ferrite-martensite fine-duplex matrix structure is machined with K-10 carbide, flank adhesion is encountered with accompanying sharp increase in cutting force at speeds above 50m/min. Tool life for the spheroidal graphite cast iron with fine-duplex matrix is much longer than that iron with pearlite matrix corresponding to FCD-60 of substantially equal hardness. This is because the flank adhesion layer or the ribbon type flank build-up layer protects the flank of tool from flank wear. High grade spheroidal graphite cast iron having Brinell hardness 240 to 318, especially spheroidal graphite cast iron with fine-duplex matrix, can be machined at the cutting speeds from 45 to 86m/min for 30min, when appropriate grade of cemented-carbide tool, K-10, are used.抄録全体を表示PDF形式でダウンロード (603K)
技術報告
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松浦 正史, 向川 信博, 岡本 和則1981 年 53 巻 1 号 p. 32-36
発行日: 1981/01/25
公開日: 2015/01/27
ジャーナル フリーPDF形式でダウンロード (2776K)
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