巻号一覧
19 巻, 12 号
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財満 鎮雄, 高橋 幸男, 加茂 進1969 年 19 巻 12 号 p. 537-542
発行日: 1969/12/30
公開日: 2008/11/05
ジャーナル フリーThis paper describes some experiments on electrolytic grinding of a hyper-eutectic Al-Si alloy (so-called "Alusil") with an electrolytic grinding wheel for trial and 5%, sodium nitrate solution as electrolyte for the purpose of improving the machinability of the alloy.
As the results, the machinability of the alloy in mechanical grinding was inferior to that of structural carbon steels, but its removal rate was medium between those of 18-8 stainless steel and high speed steel. However, in electrolytic grinding, its machinability was superior to that of high speed steel and its grinding removal was nearly equal to that of 18-8 stainless steel. Under current density and grinding pressure, which do not bring about electric discharge, the electrolytic grinding conditions were so good that the ground surface roughness was much more excellent than that obtained by mechanical grinding. The structure and heat treatment of this hyper-eutectic alloy had no great effects on its optimum electrolytic grinding conditions.抄録全体を表示PDF形式でダウンロード (1346K) -
室町 繁雄, 高辻 雄三, 多々 静夫1969 年 19 巻 12 号 p. 543-549
発行日: 1969/12/30
公開日: 2008/07/23
ジャーナル フリーAn aluminum cast alloy, containing about 20% of Si, called "Alusil", has recently been developed. Its characteristics are to have the smallest expansion coefficient among all aluminum alloys and to have other excellent properties at high temperatures. On addition of a small amount of phosphorus, the primary silicon crystals in this alloy were refined and mechanical properties of the alloy were improved.
According to the reports already described by Zaima, the machinability of this improved alloy was not very good among aluminum alloys.
Therefore, in order to improve its machinability, the authors added some elements, which are supposed to be effective in machinability, to the alloy and examined cutting resistance and the state of machined surface
in turning, milling, and drilling. Additional elements to the standard sample(Al-22% Si-0.01%P)in this study were Bi(0.050.10%), Sn(0.100.50%, ), Ca(0.050.10%), Ti(0.Ol0.08%), B(0.050.30%), Ti-B(Ti:0.01% and B: 0.050.30%), and V(0.030.30%).
The principal results obtained were as follows:
(1) On addition of Sn, cutting resistance in turning, milling, and drilling was decreased and good machined surface was obtained.
Therefore, Sn was one of the most effective additional elements in machinability of the hyper-eutectic Al-Si alloy.
(2) On addition of Bi, cutting resistance was decreased, but the machined surface was not very good.
(3) On addition of Ca, B, or B-Ti, tensile strength was decreased, and the resistance in discontinuous cutting was increased.
(4) On addition of Ti or V, some of mechanical properties were improved, but there were no effects on machinability.抄録全体を表示PDF形式でダウンロード (2326K) -
竹内 寛司, 金森 弘祐, 市川 雄庸1969 年 19 巻 12 号 p. 550-558
発行日: 1969/12/30
公開日: 2008/07/23
ジャーナル フリーMost of the products in sheet aluminum press-shops are cylindrical shells. The investigation of dimensional effects in cylindrical cup drawing will be helpful in the application of the results of drawing tests at laboratories or sheet mills to the drawing performance in any press-shops.
This paper describes the effects of punch diameter and sheet thickness on the limiting drawing ratio. The sheets used were 2S-0 sheets of the same mechanical properties with thicknesses of 0.6, 0.8, 1.0, and 1.2mm. The punches used were about 30, 54, 120, and 180 mm in diameter, having noses of various curvatures. The limiting drawing ratio were determined under the specified conditions.
The results obtained were as follows:
(1) The limiting drawing ratio (L.D.R.) linearly decreased with the increase of the ratio between the punch diameter (d1) and sheet thickness (t0), or d1/t0.
(2) When noses of the punches were in the same profile, the following equation will be applicable:
LDR = -A (d1/t0) + B
where A and B are constants, which shall be determined by experiments.抄録全体を表示PDF形式でダウンロード (1491K) -
財満 鎮雄, 武曾 当範, 山本 八郎1969 年 19 巻 12 号 p. 559-568
発行日: 1969/12/30
公開日: 2008/07/23
ジャーナル フリーA wide range of aluminum binary cast alloys were prepared for the specimens in accordance with phase diagrams. In the present study, three sorts of additional elements were used for alloying. They were zinc (considerably soluble in aluminum), manganese (slightly solublein aluminum), and iron (almost insoluble in aluminum). The alloy compositions were properly decided over a wide range with reference to solubility curves. Cutting resistance, shearing force, surface roughness, chip treatment, etc. are mainly discussed from the viewpoint of machinability in turning; and then, the effects of additional elements on the machinability are searched in this paper. The results were summarized as follows.
The cutting resistance generally decreased with the increase of additional amount of the element, but there appeared some peculiar change in the decrease of resistance at the amount of approximate to solid solubility limit or eutectic point. The cutting resistance of the alloy, to which zinc was added, was higher than that of the alloy, to which manganese or iron was added, because of higher solubility of zinc in aluminum. The surface roughness was also improved with the increase of the additional amount in the same way as the cutting resistance, and the surface of zinc-added alloy was extraordinarily better than that of manganese or iron-added alloy. The cutting mechanism of the former alloy was relatively simple in shearring, but that of the latter alloy was more complex owing to the formation of built up edge and plastic deformation. The chip treatment of zinc-added alloy was easier than that of the other (in particular, at 16% of Zn). The treatment was also easy at the amount of 1.87% of Mn or 2.64% of Fe, which is also approximate to solid solubility limit or eutectic point.抄録全体を表示PDF形式でダウンロード (2465K) -
萩原 理樹, 鈴木 敏夫1969 年 19 巻 12 号 p. 569-576
発行日: 1969/12/30
公開日: 2008/07/23
ジャーナル フリーThe effects of several conditions such as alloying elements, chemical conversion treatment, primary and finish coatings on the filiform corrosion generated on aluminum and its alloy coated sheets were studied by salt spray test, salt water immersion test, and humidity cabinet test.
The results obtained were as follows:
1. Aluminum of lower purity was more corrosive than that of higher purity. Alloys of 3003 and 5052 were more corrosion resistant than 1100 alloy.
2. The effect of chemical conversion was most remarkably observed. The resistance of the sheet treated by chemical conversion was extremely high.
3. Since the finish coated film was thicker than the primary coated one, the former was supposed to be more corrosion resistant. However, the finish coated one was not very resistant to the filiform corrosion.
4. The filiform corrosion was not so much generated by salt spray test alone. However, after the panel was successively treated by humidity cabinet test, the blister produced by salt spray test induced the filiform corrosion.抄録全体を表示PDF形式でダウンロード (2376K) -
平野 賢一1969 年 19 巻 12 号 p. 577-590
発行日: 1969/12/30
公開日: 2008/07/23
ジャーナル フリーPDF形式でダウンロード (1687K)
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