巻号一覧
後続誌
66 巻, 4 号
選択された号の論文の8件中1～8を表示しています
- |<
- <
- 1
- >
- >|
研究論文
-
新美 格, 奥宮 正洋, 倉持 公一, 杉本 猛1994 年 66 巻 4 号 p. 263-268
発行日: 1994/04/25
公開日: 2011/06/15
ジャーナル フリーWax pattern, plaster mold casting process for making magnesium alloy base composites reinforced by age hardening stainless steel, 17-7 PH, short fibers was studied. Steps of making composites are, 1st. fibers fill up in a plaster mold put in double magnetic field of AC, DC solenoid coils, 2nd. the mold with fibrous preforms is preheated, then, infiltrated molten magnesium alloy in vacuum casting system. Molten magnesium reacts upon plaster mold material, particularly high temperature preheated mold with fibrous preform inside. Some times, the mold is broken down by this reaction. Boron, and fluorine compounds are good inhibitors for this reaction. Near net shape composites castings of mechanical test specimen have fiber volume fraction of 39.3 %, and fiber alignment of 8.33° in axis. Tensile strength is 462.3 MPa, and fatigue strength is 140 MPa. Automotive engine connecting rod was casted in this system. Fibers aligned along curve of the shape of connecting rod.抄録全体を表示PDF形式でダウンロード (737K) -
片岡 義博, 宮﨑 俊行1994 年 66 巻 4 号 p. 269-274
発行日: 1994/04/25
公開日: 2011/06/15
ジャーナル フリーPulsed YAG laser of low power density is used for drilling of tool steels with assist gases such as nitrogen, air and oxygen. Effects of the gases on removed volume and drilled depth are investigated. The removed volume and the drilled depth take the highest values under the oxygen assist gas drilling. This will be due to the heat of oxidation and exothermic reaction. The drilled surface in oxygen assist gas is observed with EPMA. EPMA analysis indicates that the drilled surface contains oxides and carbon atoms do not exist. The oxides are produced by the following oxidation reaction : Fe + 1/2 O2 = FeO. The experimental results show that assist gases make possible the drilling in low power density.抄録全体を表示PDF形式でダウンロード (747K) -
松川 安次, 曽我 正清, 近藤 喜之, 薬師寺 正雄1994 年 66 巻 4 号 p. 275-280
発行日: 1994/04/25
公開日: 2011/06/15
ジャーナル フリーFluidized bed calcining is the most commonly used method for the thermal sand reclamation, but the characteristics of the calcination of molding sand in fluidized bed is not well understood. In this study, the influence of calcining temperature on the combustion process of carbonaceous materials in the green sand and shell molding sand was investigated by using the laboratory scale fluidized bed calciner. As a result, it was found that the combustion rate of carbonaceous materials in the molding sand increases exponentially with rise of the calcining temperature and that the combustion rate of carbonaceous materials in the shell molding sand is greater than that in the green sand. The minimum amount of carbon was retained after calcining of the green sand at about 923 K. It is considerd, therefore, that the optimum calcining temperature range is about 873 K to 973 K and that the temperature of the entire fluidized bed should be maintained within this temperature range to attain efficient calcining.抄録全体を表示PDF形式でダウンロード (791K) -
嵯峨 常生, 永井 修次, 松澤 和夫1994 年 66 巻 4 号 p. 281-285
発行日: 1994/04/25
公開日: 2011/06/15
ジャーナル フリーCutting resistance, cutting temperature and others of pure magnesium and AZ 91 magnesium alloy castings related to the change of cutting speed were examined by an inward face turning under the cutting conditions in Table 2. The cutting speed dependence is hardly observed in the cutting resistance and the machined surfaces of both specimens. The cutting ratio is in the range of 0.6∼0.7, and the shearing angle shows the values as large as 0.64∼0.58 rad. The highest values of the cutting temperature in pure magnesium and AZ 91 magnesium alloy castings are 573 K and 621 K, respectively, at the cutting speed of 15 m/s. From the above results, it has become clear that a high speed and a heavy cutting can be applied to both specimens. There is no particular problem in the aspect of safe working in the range of the cutting conditions adopted in this experiment.抄録全体を表示PDF形式でダウンロード (748K) -
香川 明男, 太田 泰平1994 年 66 巻 4 号 p. 286-291
発行日: 1994/04/25
公開日: 2011/06/15
ジャーナル フリーThe simulation method for the prediction of chill formation in freezing spheroidal graphite cast iron has been established. Chill test using a wedge-shape mold has been carried out for comparison. The melt was poured into the wedge-shape mold with thermocouples set on the center line, corresponding to different thickness of casting. Chill fraction and nodule counts were measured near the thermocouples on the horizontal sections of the casting. The varidity of growth rate equations for ledeburite and graphite eutectic and equations evaluating solid fraction and eutectic temperatures were examined by comparing the predicted chill fraction and nodule count with experimentally obtained ones. It has been found that the application of Johnson-Mehl equation gives a relatively higher chill fraction and the dependence of nodule count on supercooling should be taken into account to explain the variation of observed nodule counts with cooling rate. It has been also revealed that the predicted distribution of chill fraction is significantly influenced by the dependence of eutectic temperatures on silicon concentration.抄録全体を表示PDF形式でダウンロード (648K)
技術報告
-
小綿 利憲, 堀江 皓, 平塚 貞人, 松本 忠則1994 年 66 巻 4 号 p. 292-297
発行日: 1994/04/25
公開日: 2015/01/21
ジャーナル フリーPDF形式でダウンロード (3228K) -
千田 昭夫, 越智 敬一, 関野 邦夫, 芝 重和1994 年 66 巻 4 号 p. 298-303
発行日: 1994/04/25
公開日: 2015/01/21
ジャーナル フリーPDF形式でダウンロード (2629K) -
石黒 康文, 鈴木 基央, 陣山 展夫, 中村 元志1994 年 66 巻 4 号 p. 304-308
発行日: 1994/04/25
公開日: 2015/01/21
ジャーナル フリーPDF形式でダウンロード (2354K)
- |<
- <
- 1
- >
- >|