巻号一覧
後続誌
64 巻, 11 号
選択された号の論文の8件中1～8を表示しています
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研究論文
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久保田 耕平, 二宮 隆二, 佐藤 勉, 尾城 武司1992 年 64 巻 11 号 p. 765-772
発行日: 1992/11/25
公開日: 2011/06/25
ジャーナル フリーThe shrinkage is produced at the underside of cast Zn-high Al alloys and their hardness is greatly decreased during the solidification in the sand mold, due to their age-softening. We have developed new types Zn-high Al alloys, Z1610 (Zn-16 Al-10 Cu-0.02 Mg) and Z2520 (Zn-25 Al-20 Cu-0.02 Mg), which solve the problems, such as Underside-Shrinkage and age-softening, of the existing alloys. Higher Cu-content makes the solidification range narrower, consequently raising of their primary phases is restrained. So the new alloys produce less Underside-Shrinkage and further show less age-softening by crystallizing intermetallic compounds of CuAl and CuAl2抄録全体を表示PDF形式でダウンロード (884K) -
山田 康晴, 古屋 泰文, 新山 英輔, 中村 史朗1992 年 64 巻 11 号 p. 773-780
発行日: 1992/11/25
公開日: 2011/06/25
ジャーナル フリーThe possibility of non-destructive evaluation of the metallurgical microstructures and fracture toughness in the ductile thick walled spheroidal graphite cast iron (i. e. so-called cask) was studied by using magnetic Barkhausen noise (BHN) analysis. BHN signal was detected through a contact type sensor set on the surface of Charpy impact type block specimen and analyzed by a digital spectrum analyzer. Ferrite matrix, graphite morphology and Charpy impact value at 233 K were investigated, and the correlations between these values and BHN were discussed. Main results are (1) Normalized low frequency intensity parameter (LFI) from Barkhausen noise spectrum depends on grain size of ferrite matrix. (2) Charpy impact value at 233 (K) depends on grain size of ferrite matrix. (3) The defined Barkhausen noise parameter (LFI) from spectrum can be correlated with Charpy impact value at 233 (K).抄録全体を表示PDF形式でダウンロード (774K) -
大出 卓, 藤田 典之, 伊豆井 省三, 小口 威朗, 前川 直人1992 年 64 巻 11 号 p. 781-786
発行日: 1992/11/25
公開日: 2011/06/25
ジャーナル フリーOne of the most interesting subjects about Inmold process is the dissolution behaviour of spheroidizing alloy in a reaction chamber. By water flow modelling, both wetting process of commercial drinking coffee grains with water and colored water flow dissolved with the grain run out of the transparent chamber which was made of acrylic plate were observed under a video camera. And chilled specimens and castings were actually produced by special successive casting apparatus using rare-earth elements containing new alloy. Chemical analysis and image analysis were carried out on them. Alloy content and chamber space were important to make clear the disolution behaviour.抄録全体を表示PDF形式でダウンロード (583K) -
大出 卓, 藤田 典之, 伊豆井 省三, 小口 威朗, 田中 竜馬1992 年 64 巻 11 号 p. 787-793
発行日: 1992/11/25
公開日: 2011/06/25
ジャーナル フリーBy using newly-developed three kinds of exclusive spheroidizing alloys containing bismuth, spheroidal graphite cast iron was produced with Inmold process. Dry sand molds of casting thickness from 3 mm to 50 mm were prepared. Effect of alloys on the yield rate, structure and mechanical properties of cast iron were examined as compared with usual alloy. Excellent spheroidal graphite cast iron was produced by using these new alloys. Especially the extreme increase of graphite nodule count was observed in thin sectioned casting by adding a slight amount of bismuth.抄録全体を表示PDF形式でダウンロード (793K) -
小林 武, 糟谷 良和1992 年 64 巻 11 号 p. 794-800
発行日: 1992/11/25
公開日: 2011/06/25
ジャーナル フリーIn this study, the evaporative pattern casting of cast iron was carried out using the bottom pouring method to determine the effects of thermal decomposition gas pressure and the thickness of the gas gap on the filling rate of molten cast iron. The results obtained are summarized as follows : (1) It was found that the filling rate of the iron melt in evaporative pattern casting was not affected by the cross section of area of the ingate, but was affected significantly by thermal decomposition gas pressure in the pattern. Therefore, the gas gap created by the thermal decomposition of the pattern increases when the filling rate of the iron melt is slower. (2) Since the coating layer of the pattern was found to be permeable, the filling rate of the iron melt was determined to be affected by the thermal decomposition rate of the pattern. (3) The thermal decomposition gas pressure increased with an increase of pouring temperature and an increase of the PMMA contents in the pattern.抄録全体を表示PDF形式でダウンロード (872K) -
張 鐘植, 永井 恭一, 恵良 秀則, 岸武 勝彦1992 年 64 巻 11 号 p. 801-805
発行日: 1992/11/25
公開日: 2011/06/25
ジャーナル フリーThe effect of precipitated fine graphites on micro-yielding, tensile properties and fatigue strength has been investigated in two types of ferritic spheroidal graphite cast iron, i. e. a normally annealed iron and an iron containing numerous precipitated fine graphites. It was found that slip lines originated from precipitated fine graphites at a lower tensile strain in the specimen with precipitated graphites than in the normal specimen. This means that micro-yielding occurred at a lower stress in the specimen with precipitated graphites. Young's modulus of the specimen with precipitated graphites was lower than that of the normal specimen due to the micro-yielding at the early stage of the microscopically elastic strain. The tensile strength was not varied, but the elongation was greatly decreased by precipitated graphites because of the remarkable decrease of the distance between voids formed at the precipitated graphites. Fatigue strength was also significantly decreased by the presence of precipitated fine graphites.抄録全体を表示PDF形式でダウンロード (563K) -
西 直美, 駒崎 徹, 佐々木 英人1992 年 64 巻 11 号 p. 806-811
発行日: 1992/11/25
公開日: 2011/06/25
ジャーナル フリーThe changes of pressure and temperature of ADC 10 molten metal which were injected into a die cavity were measured using 90 metric tonne locking force cold chamber type die casting machine. The molten metal pressure and temperature were measured with a ring-type pressure gauge and with an iron-constantan thermocouple installed in an ejector pin, respectively. The maximum pressure in the experiment decreased with decreasing casting temperature and with increasing shot time lag. The duration of maximum pressure decreased with shot time lag. In the case of short shot time lag, the temperature or molten metal alloy injected into the die cavity was found to be cooled down towards the liquidus temperature of the ADC 10 alloy. The temperature drops between liquidus and solidus line with increasing shot time lag. The solidification time, time from molten metal filling die cavity to temperature reaching solidus line is in direct proportion to the duration of maximum pressure.抄録全体を表示PDF形式でダウンロード (568K)
解説
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石野 亨1992 年 64 巻 11 号 p. 812-815
発行日: 1992/11/25
公開日: 2015/01/22
ジャーナル フリーPDF形式でダウンロード (2238K)
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