巻号一覧
18 巻, 6 号
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財満 鎮雄, 結城 明泰, 加茂 進1968 年 18 巻 6 号 p. 307-313
発行日: 1968/06/30
公開日: 2008/10/30
ジャーナル フリーThe effects of shape and dimensions of drill on the figure and accuracy in dimensions of drilled hole, drilling resistance, etc. are discussed for drilling of aluminum alloy plates with a fishtail point drill.
The results obtained were as follows.
Some heaps at the hole inlet and burrs at the hole outlet were produced in drilling of soft plates such as 2S and 3S, but they were not so large in height as those produced by the conventional drills. However, the worked hole surface obtained by the point drill was superior to that by the conventional drills. The drilling machinability with respect to drilling resistance, enlargement of hole diameter, heaps and burrs, etc. of hard plates such as G4 and 52S by the fishtail point drill was superior to that of soft plates such as 2S and 3S, and the machinability of 14S, 61S, etc. was arranged in medium order. Of course, there is no trouble in drilling of hard plates such as G4 and 52S with the fishtail point drill, but the conventional drills can be used for this purpose. Then, it is concluded that the fishtail point drill is not so favorable for these hard materials.抄録全体を表示PDF形式でダウンロード (4938K) -
急冷凝固Al-Zr合金の研究 第1報市川 理衛, 大橋 照男1968 年 18 巻 6 号 p. 314-319
発行日: 1968/06/30
公開日: 2008/10/30
ジャーナル フリーThe studies on recrystallization of Al-Zr alloys have been made by many investigators since Harrington's report in 1949. These studies showed that age hardening property was found in these alloys. However, the authors were interested with the further examination of this property in the above alloys containing much more solute of Zr. The property was investigated on super-saturated solutions obtained by quenching of uniform molten bath of Al-Zr alloys.
The results obtained were as follows:
(1) According to the results of electrical resistivity measurements, it would be possible in these experiments to get the solid solubility limit of Zr in Al up to about 1.2wt.% by quenching of molten Al-Zr alloys.
(2) Age hardening of these alloys containing more than 0.4wt.% of Zr was remarkable and it increased to the maximum at about 1.2wt.%.
(3) Precipitation of Zr took please at 300°C for 1hr. annealing and the maximum precipitation hardening was given at about 400-450°C.
(4) Inpurities such as Fe, Si, etc. seemed to have deep effects on the precipitated structures of these alloys.抄録全体を表示PDF形式でダウンロード (4140K) -
福井 利安1968 年 18 巻 6 号 p. 320-331
発行日: 1968/06/30
公開日: 2008/10/30
ジャーナル フリーA study was made of the effects of small amounts of additional elements on hot-cracking of pure Al and alloys of Al-Mn, Al-Mg, Al-Mg-Si, Al-Cu-Mg and Al-Zn-Mg systems.
Susceptibilities to cracking were evaluated for tests of fish-bone cracking, bead-on-plate weld cracking and ring cast cracking.
The results obtained were as follows.
(1) The susceptibility to cracking of aluminum alloys in ring cast cracking test decreased by the addition of Ti, B or Zr; in particular, by Ti.
(2) However, the addition of Zr had the most remarkable effects on the decrease of susceptibility in weld cracking test. The addition of either Ti or B had no appreciable effects, though they had more grain refining power for weld metals than Zr.
(3) None of other additional elements such as Be, V, and Mo were found to be effective for the decrease of hot-cracking of aluminum alloys, except for Al-Cu-Mg system.
(4) The susceptibility to cracking of aluminum alloys in weld cracking test depended upon various metallurgical factors as well as upon grain size, while in ring-cast cracking it mainly depended upon grain size抄録全体を表示PDF形式でダウンロード (9269K) -
アルジルの研削加工に関する研究 (第1報)財満 鎮雄, 高橋 幸男, 下江 汪, 滝水 莞爾1968 年 18 巻 6 号 p. 332-338
発行日: 1968/06/30
公開日: 2008/10/30
ジャーナル フリーThe grinding machinability of alusil by centerless grinder is discussed in this paper in comparison with that of mild steel having almost the same hardness as alusil. The grinding energy, in particular, centerless grinding energy has hitherto been considered very difficult to be measured. However, a digital type grinding dynamometer was manufactured for trial for this measurement by applying a recently developed measuring circuit, in which pulse signal is used as a sort of time measuring scale. The dynamometer was found to be very useful, because it attains good stability and high accuracy and can readily and directly indicate instant power changes.
The results were summarized as follows.
The grinding torque and its tangential component of alusil were slightly less than those of mild steel having almost the same hardness as alusil. But the grinding time for a certain decrement of diameter in alusil was longer than that for the same decrement in mild steel. The roughness of finished surface after centerless grinding was superior in alusil to that in mild steel by NF-roughness. However, as the results of the minute observation of the both surfaces, the surface of mild steel was better finished than that of alusil.抄録全体を表示PDF形式でダウンロード (4293K) -
村上 陽太郎, 森 邦彦1968 年 18 巻 6 号 p. 339-346
発行日: 1968/06/30
公開日: 2008/10/30
ジャーナル フリーAluminum alloys, containing larger amounts of manganese above the maximum equilibrium solubility, were solidified by cooling the molten alloys in a special copper mould. The structures and properties of the solidified alloys and their decomposition process by annealing at various temperatures were examined by means of optical and transmission electron microscopes, X-ray diffraction analysis, microhardness test, and electric resistivity measurement.
The results obtained were summarized as follows.
(1) Solid solution containing a considerably large amount of Mn was easily obtained with aluminum alloys. The degree of supersaturation depended upon the cooling rate from molten state. The structure was not completely homogeneous; i.e., the solute concentration on the cell boundaries was higher than that in the interior of the cell. The difference in the above concentrations was greater with higher content of Mn or lower cooling rate.
(2) Discontinuous precipitation was observed on the cell structure when annealed at some temperatures. When annealed at above 550°C, Al6Mn was found to be as a stable second phase and it was replaced by G phase at annealing temperatures below 550°C. The G phase was more easily formed when the degree of supersaturation was relatively low.抄録全体を表示PDF形式でダウンロード (5836K) -
木村 啓造1968 年 18 巻 6 号 p. 347-359
発行日: 1968/06/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (8531K)
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