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40 巻, 4 号
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研究論文
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喜多 清1968 年 40 巻 4 号 p. 352-359
発行日: 1968/04/25
公開日: 2012/10/04
ジャーナル フリーThis Study is carried out about the effect of Casting Stress for the crack which is caused in pearlite cast iron Disk-Brake and the effect of other factors for that. One of the crack is found with the machined or cast state, which is caused on the round of out and in side, the other is found to Disk-Brake state, which is caused radialized at the abrasion surface.
Author had an experiment to measure the residual strain that was made by strain gauge and other experiment for the mutuality relationship between the crack and the component of Disk-Brake. The results of the study are followed:
(1) Casting stress is the most effective causing factor than many other factors, which are casting configuration, mold and core restraint, casting design and pouring condition which lead to fin, that are causing factors for Casting Stress.
(2) The most effect of component for the crack on Disk-Brake is appeared on relation between carbon equivalent C.E.=T.C+1⁄3(Si+P) and the amount of the crack caused Disk-Brake to produced Disk-Brake per one ladle ratio.抄録全体を表示PDF形式でダウンロード (1104K) -
雄谷 重夫, 神尾 彰彦1968 年 40 巻 4 号 p. 359-369
発行日: 1968/04/25
公開日: 2012/10/04
ジャーナル フリーA morphological theory on the freezing manner of the alpha-solid in the hypo-monotectic copper-20% lead alloy is proposed from the information of the water-quenching techniques. Effects of the minor constituents such as tin, nickel, zinc, aluminum and iron on the formation of alpha-solid were also determined.
Solidification of the hypo-monotectic copper-lead alloy is assumed in the most part the course of nucleation and growth of alpha-dendrites. Nucleation of the alpha-solid is completed down to 25°C from the liqidus temperature at 1,010°C. The generated nuclei are immediately grown into dendrites and completed the linear growth during cooling within 5°C or undercooling 30°C from the liquidus temperature. Such dendrites are widened or fattened with further cooling. At the monotectic temperature, new alpha-components are deposited onto the existing alpha-dendrites without the formation of individual phase. Prefered deposition at cell boundaries and arm spacings leads to in consequence irregular shapes of dendrites.
Tin 2% in the alloy has the most noticeable effect of accelerating the nucleating course where the nucleation is completed down to 15°C from the liquidus temperature, increasing the number of the nuclei and decreasing their size. This fact shall be caused extreme piling-up of tin in the liquid. Nickel 2% also accelerates formation of the dendrite to some degree, but less piling-up is found in the solid-liquid interface. Iron 1.2% increases the number of alpha-solid, refines and granulates them accompanying occurence of the lead net-work.抄録全体を表示PDF形式でダウンロード (1495K) -
黒田 義郎, 青木 正男, 下島 昭二, 宇塚 恭治1968 年 40 巻 4 号 p. 369-382
発行日: 1968/04/25
公開日: 2012/10/04
ジャーナル フリーGenerally, Spheroidal Graphite Cast Iron is produced from metal melted in cupola or low frequency electric furnace. These furnaces are most in practice with basic or acid lining, having many characteristics, respectively. There is a report, however, that Speroidal Graphite Cast Iron produced by acid operation isn’t different from basic at adequate desulphurization.
Therefore, we have primarily started to observe the inclusions of Speroidal Graphite Cast Iron by Electric Microprobe Analyser to define the characteristics of basic and acid operation.
The results obtained are as follows;
(1) Ti-V-C inclusion doesn’t change throughout the process to produce Speroidal Graphite Cast Iron in basic or acid operation.
(2) Phospher-contained inclusion has a tendency to decrease during melting practice, especially in basic operation. After spherodizing operation that isn’t detected at all.
(3) Mn-S inclusion disappeares at spheroidal treatment and simultaneously Mg-O and Mg-S inclusion appeares although Mg-S inclusion is few in both operations, especially in basic.抄録全体を表示PDF形式でダウンロード (1540K) -
喜多 清1968 年 40 巻 4 号 p. 384-390
発行日: 1968/04/25
公開日: 2012/10/04
ジャーナル フリーWe have compared the actual body strength of spheroidal cast iron and that on Y-block, and then discussed the difference. The results are given as follows:
On the as-cast, the actual body strength was 70∼90% of the value on Y-block, the elongation was min. 40% of that and the hardness was min. 75% of that. On the annealing, the strength was 80∼90% of the value on Y-block, the elongation was min. 50% of that and the hardness was min. 75% of that.
That result which the actual body strength is lower than the value on Y-block, caused due to some of the difference on the Micro-Structure and Porosity, which are caused on account of the difference on cooling condition and solidification state. In other words, that result is caused due to the difference on solidification based upon the casting configuration and the casting design.抄録全体を表示PDF形式でダウンロード (969K)
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