巻号一覧
後続誌
58 巻, 7 号
選択された号の論文の7件中1～7を表示しています
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技術報告
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西尾 憲行, 河合 真, 水谷 稔, 森 啓, 高橋 和久1986 年 58 巻 7 号 p. 460-465
発行日: 1986/07/25
公開日: 2015/01/27
ジャーナル フリーPDF形式でダウンロード (2841K)
研究論文
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松田 政夫, 西岡 弘雄, 片山 正則1986 年 58 巻 7 号 p. 466-472
発行日: 1986/07/25
公開日: 2011/10/25
ジャーナル フリー“Mushiness degree=fc/fb” is proposed to estimate solidification manner of gray cast iron, where fc anf fb are fractions of solid at the center and surface of a casting respectively. The increasing rate of fraction solid, df/dt, during eutectic solidification is defined as : df/dt=K1Δθ (df/dt<0.007s−1)……(1) and df/dt=K2Δθ2 (df/dt<0.007s−1)……(2) where K1 and K2 are peculiar numbers for a molten metal and Δθ is undercooling temperature below the equilibrium eutectic. Heat conductional analyses of cross-sectional distribution of Δθ in the arrest were carried out for plate-like castings with different thickness and for cylindrical castings with different radii by the use Eqs. (1) and (2). The mushiness degrees were evaluated when fb reached 80%. The metal with a smaller value of K1 or K2 shows a greater mushiness degree.抄録全体を表示PDF形式でダウンロード (695K) -
林 守仁1986 年 58 巻 7 号 p. 473-478
発行日: 1986/07/25
公開日: 2011/10/25
ジャーナル フリーThe tensile behavior of JIS AC8A castings at elevated temperatures was experimentally studied for elucidating a basic process of occurrence and propagation of thermal cracks. Tensile test was performed at a given temperature in the range from room temperature to liquidus and at a fixed strain rate from 10−1 to 10−4/s in the air. Mechanical properties and behaviors of the alloy at elevated temperatures such as tensile strength, deformation behavior and fracture pattern changing with temperature are clarified. Empirical relationships of strength, temperature and strain rate are introduced.抄録全体を表示PDF形式でダウンロード (669K) -
阿部 利彦, 井川 克也1986 年 58 巻 7 号 p. 479-484
発行日: 1986/07/25
公開日: 2011/10/25
ジャーナル フリーEffects of chemical composition, shape of graphite and matrix structure upon the sound velocity, tensile strength and damping capacity of cast iron were investigated by the use of an effective area fraction model. Flaky and CV graphites are represented by a disk of d in diameter and t in thickness, and spheroidal graphite is represented by a sphere of d in diameter in this model. The effective area fraction of matrix, Aef, is expressed as functions of graphite weight (g) in 1cm3 of cast iron and d/t ratio respectively for flaky and CV graphite cast irons. The degree of spheroidization is expressed as a function of d/t. Tensile strength of cast iron is expressed as a function of Aef. The damping capacity, Q−1, of cast iron is expressed as a first approximation of Young's modulus. The damping capacity increases with increasing of the graphite amount and d/t ratio.抄録全体を表示PDF形式でダウンロード (680K) -
雄谷 重夫, 大滝 光弘, 小林 敬一1986 年 58 巻 7 号 p. 485-490
発行日: 1986/07/25
公開日: 2011/10/25
ジャーナル フリーA new approach for limit deformation in the final freezing zone and for thermal contraction with increase of fraction solid was applied to investigate the quantitative and detailed mechanism of hot tearing through solidification of Cu-Zn alloy castings. The limit deformation is determined by apparent deformation of solidifying alloy and length of final freezing zone. The calculated thermal contraction is expressed as functions of such alloy properties as fraction solid at linear contraction start and coefficient of linear shrinkage and such casting conditions as temperature gradient, length of final freezing zone and length of casting. Occurrence of hot tearing in I-beam test bar is predicted by comparing the limit deformation with thermal contraction through solidification.抄録全体を表示PDF形式でダウンロード (618K) -
辻川 正人, 細井 宏一, 川本 信, 岡林 邦夫1986 年 58 巻 7 号 p. 491-495
発行日: 1986/07/25
公開日: 2011/10/25
ジャーナル フリーHardness and crash tests on Al-10%Cu alloys having a variety of primary structure in the solid-liquid state at elevated temperatures were carried out to estimate the structure preferable to thixo-castings using an apparatus newly developed. Rheocastings having structures further refined and those having granular primary structures in place of usual dendritic structures have softness to a greater degree in the crash test notwithstanding equal static hardness. The fraction of granular structures in the whole fraction solid has a great infiuence on mechanical properties of the alloy slurry.抄録全体を表示PDF形式でダウンロード (651K) -
太田 英明, 藤井 省造, 島 政雄, 吉田 良広1986 年 58 巻 7 号 p. 496-499
発行日: 1986/07/25
公開日: 2011/10/25
ジャーナル フリーThe optimum condition for hardening phenolic urethane bonded sand molds with amine gas under reduced atmosphere was examined from the strength and hardened volume of the molds. The optimum condition includes −300mmHg of reduced pressure and less than 400m/mn of the passing rate, in which the strength and hardened volume drop little and hardening gas leakage is prevented. The drops in strength and hardened volume are recovered by increasing amine gas, even though the reduced pressure is less than the optimum pressure. Excess of amine gas is harmful, because the gas volume from an air-purged mold increases.抄録全体を表示PDF形式でダウンロード (493K)
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