巻号一覧
23 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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嵯峨 常生, 永井 修次1973 年 23 巻 7 号 p. 297-302
発行日: 1973/07/30
公開日: 2008/10/30
ジャーナル フリーAn experiment has been conducted on the simple method of determination of the machinability of the 2011 alloy. It has been found that if the effects of various cutting conditions on the surface roughness and the cutting force are known, the machinability can be simply evaluated by the number and the shape of chips. The chip char-acteristics sensitively depend on the method of tool bit setting and the stiffness of the machine tool.抄録全体を表示PDF形式でダウンロード (2433K) -
長田 純夫, 今川 耕治, 北原 晃, 秋山 茂, 上野 英俊, 徳広 祐之輔1973 年 23 巻 7 号 p. 303-309
発行日: 1973/07/30
公開日: 2008/10/30
ジャーナル フリーThe Shirasu Balloon, developed by Kyushu Government Industrial Research Institut eand produced from acidic volcanic ejecta and having a form of glassy hollow microsphere, has been used to produce Shirasu Balloon-Al composite by the pre-pack pressure casting method. Although it has many favourable properties such as light and heat resisting, heat insulating, and shock absorbing properties, this composite has less favourable mechanical properties.In the present study, effects of applied pressure in the pre-pack casting on the density and the mechanical properties of the composite have been examined. The main results obtained are as follows:
(1) The larger applied pressure produces the better mechanical properties and the larger density.
(2) The density of the composite is directly related to the strength of the Shirasu Balloons under the hydraulic pressure.
(3) The impact strength is less sensitive to the applied pressure than the tensile and the transverse strength.
(4) The maximum specific mechanical strength is obtained when 60kg/cm2 is applied for the composite with 150-297μ balloons, 40kg/cm2 for the with 297-420μ balloons and 20kg/cm2 for the with 420-590μ balloons.
(5) The production of lighter and stronger composites requires the application of enough pressure to fill all the gap between the balloons with molten metal and the use of the strong balloons which can endure the high pressure to be required.抄録全体を表示PDF形式でダウンロード (1555K) -
北原 晃, 今川 耕治, 長田 純夫, 秋山 茂, 上野 英俊, 徳広 祐之輔1973 年 23 巻 7 号 p. 310-316
発行日: 1973/07/30
公開日: 2008/10/30
ジャーナル フリーEffects of heat treatment on mechanical. properties of composites produced from aluminum and Shirasu balloons, hollow microsphere of aluminosilicate glass, were studied. The reaction of Shirasu balloon with aluminum was also examined by an X-ray diffraction method, an electron microprobe analysis and a scanning electron microscopic technique. The results obtained were as follows:
(1) The main chemical reaction occurs between Shirasu balloons and Al and is describcd as 3SiO2+4Al→3Si+2Al2O3. Some other oxides such as Fe2O3, Na2O and K2O in the balloons are also reduced by Al.
(2) Al oxide, thus formed, replaces Silica or other oxides to form. the balloon walls. The Al oxide has initially a structure of η-alumina and then, changes to θ- and α-alumina.
(3) Silicon and iron diffuse into the matrix through the Al oxide layer to form a solid solution.
(4) Changes of mechanical properties can mainly be attributed to Si produced. The tensile and the bending strength are improved by conducting heat treatment at temperatures below 577°C, the eutectic temperature of the Al-Si alloy. This is caused by the enrichment of Si in the matrix and the precipitation of supersaturated Si at the balloon walls or the grain boundaries of the matrix. However, heating above the eutectic temperature reduces to strength remarkably because the shrinkage porosities are developed.
(5) Iron forms the Al-Fe-Si compound and hardly affects the mechanical properties because of its small content in the balloon.抄録全体を表示PDF形式でダウンロード (1402K) -
村松 克己, 田中 英司, 竹内 勝治1973 年 23 巻 7 号 p. 317-321
発行日: 1973/07/30
公開日: 2008/10/30
ジャーナル フリーAs a part of study on data scattering of fatigue strength of aluminum alloys, the P-S-N diagrams of the notched and unnotched specimens of A5083-0 and A7N01-T6 (Al-Zn-Mg) alloys were obtained.
(1) The fatigue strength of th unnotched 5083-0 alloy is 15.22kg/mm2 and 14.73kg/mm2 for 50% and 90% survivors at 107 cycles, respectively, while those of the A7N01-T6 alloy are 18.28kg/mm2 and 17.75kg/mm2. The notched A5083-0 alloy specimens with the stress-concentration factor of 3.0 have the fatigue strength of 6.28kg/mm2 for 50% survivors and of 5.77kg/mm2 for 90% survivors. The notched A7N01-T6 alloy specirnens with the similar shape have the fatigue strength of 11.38kg/mm2 and 11.02kg/mm2 for the corresponding cases.
(2) The P-N line shows a linearelation on the log-normal probability representation. However, when the stress level is close to the fatigue strength at 107 cycles, the P-N curves are composecl of two straight lines. This suggests that the fracture mechanism at the low stress level is different from that at the high stress level.
(3) The fatigue strength, obtained by the staircase method, at 107 cycles reasonably agrees with that calculated from the P-S-N diagram under the assumption of the straight P-N line. However, the strength of 10% survivors, obtained from the P-S-N diagram, lies in the dangerous area.抄録全体を表示PDF形式でダウンロード (1170K) -
柳沢 篤, 北 洋一郎, 本間 梅夫, 雄谷 重夫1973 年 23 巻 7 号 p. 322-329
発行日: 1973/07/30
公開日: 2008/10/30
ジャーナル フリーAluminum sheets having different textures were prepared from the castings, of which the crystallographic orientations were three dimensionally controlled by means of unidirectional growth of growth twin, columnar and equiaxed crystals. The sheet texture and the initial orientation of the casting significantly affected the Lankford value, the earing and the limited drawing ratio.
(1) The initial orientations transform into the rolling textures, {110} <112>, {112} <111> and n {123} <121> or their mixture.The {110} <112> rolling texture transforms into the {110} <001> recrystallization texture and the {112} <111> or the n {123} <121> into the {001} <100>.
(2) The earing correlates with the texture. The coexistence of two types of textures results in the 45° earing. The {001} <100> and the {110} <001> texture produce the 0°-90° earing.
(3) A hyperbolic correlation exists between the X-ray reflection intensity of (200) planes and the Lankford value.
(4) Positive and linear correlations are found between the earing and the planar anisotropy and between the deep-drawability and the normal anisotropy.
It is suggested that press-formability depends on the final orientations, particularly the population of (200) planes which are further governed by the initial orientations of casting. The Lankford value is an effective parameter representing drawability.抄録全体を表示PDF形式でダウンロード (880K) -
大森 梧郎, 土田 敬, 泉 彰英, 木村 啓造1973 年 23 巻 7 号 p. 330-331
発行日: 1973/07/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (260K) -
堂山 昌男1973 年 23 巻 7 号 p. 332-344
発行日: 1973/07/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (1554K)
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