巻号一覧
22 巻, 5 号
選択された号の論文の8件中1～8を表示しています
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財満 鎮雄, 近藤 玄道1972 年 22 巻 5 号 p. 309-315
発行日: 1972/05/30
公開日: 2008/07/23
ジャーナル フリーThe thermal expansion coefficient of aluminum alloys is about three times as large as that of steel and iron. A considerable raise of cutting temperature is recognized in machining of aluminum alloys and the effects of the heat on dimension accuracy cannot be neglected. In particular, the compensation of the heat for machining accuracy will be an important problem in precision machining under numerical control.
This paper describes theoretical analysis of dimensional errors in radial directions due to expansion by cutting heat in turning of duralumin (2017) round bars. The results of analysis were compared with those of the cutting tests. When the calculation for analysis was made in consideration of boundary conditions, the values obtained were very approximate to the measured values. Therefore, it would be possible to compensate cutting heat for machining accuracy of the material.抄録全体を表示PDF形式でダウンロード (703K) -
佐藤 金司1972 年 22 巻 5 号 p. 316-324
発行日: 1972/05/30
公開日: 2008/07/23
ジャーナル フリーThis paper describes the measurement of net punching force required for plastic deformation of aluminum sheet in folding work.
For the object of measuring the net punching force was used an octagonal ring road cell, which was proposed by Loewen and Cook as a tool dynamometer in orthogonal cutting process.
The net punching force was obtained being resolved into vertical and horizontal componemts by means of the above apparatus.
The material mainly used in the experiment was annealed aluminum sheet; and annealed mild steel and stainless steel were also used for comparison.
The results were obtained under a wide range of experimental conditions with respect to punching force-stroke diagram and shape of bent side and bending angle of the product.
Both vertical and horizontal punching forces reached their maximum values at a very early stage of deformation process. The maximum values depended upon the sheet material and working conditions; they were lower when the material was softer.
Shape accuracy of the bent product was improved by axial tensile force, but the criterion of this force was not analytical obtained.
An expression showing one component of this force, which means the frictional force between the punch and sheet material, was given. Its numerical values were calculated by this expression from measured values of punching forces and bending angles.抄録全体を表示PDF形式でダウンロード (932K) -
アルミニウム合金の時効現象に関する研究(第2報)西 成基, 篠田 武雄1972 年 22 巻 5 号 p. 325-332
発行日: 1972/05/30
公開日: 2008/07/23
ジャーナル フリーThe effects of Be and Na on the aging phenomena of Al-Si-Mg alloys were investigated mainly by means of resistivity measurement in liquid nitrogen and by electron microscopy. Experiments were conducted to investigate the effects of addition of Be (0.09 wt%) and Na (0.0090.01 wt%) on the formation of G. P, zones in Al-Si-Mg alloys.
The results obtained were as follows:
(1) The density of distribution of the G. P. zones composed of Si and Mg atoms increased when Be was contained in the G. P. zones. When these alloys containing Be were aged at high temperatures, the alloys were prevented from over-aging by the effect of Be.
(2) The addition of Na to Al-Si-Mg alloys prevented them from aging.
(3) The structural changes during age hardening were investigated by X-ray diffraetiometry and electron microscopy. It was found that the precipitate formed was the intermediate phase (β') in aging at low temperatures (up to 300°C); but the equilibrium phase Mg2Si (β') was formed together with β'-phase in aging at above 300°C.抄録全体を表示PDF形式でダウンロード (2730K) -
今林 守, 富田 耕平, 染谷 武1972 年 22 巻 5 号 p. 333-339
発行日: 1972/05/30
公開日: 2008/11/05
ジャーナル フリーThe effect of such principal alloying elements to aluminum as Si, Cu, Mg and Zn on the stationary concentration of hydrogen in molten aluminum was studied. The hydrogen concentration in binary alloys of Al-Si, Al-Cu, Al-Mg and Al-Zn in the molten state in the air was measured at proper intervals and the stationary concentrations of hydrogen (Hs) were evaluated. The results are summarized as follows.
(1) Hs increased slightly by the addition of Si when the amount of Si was less than 12%. However, when 19% of Si was present in the melt, Hs showed a marked increase.
(2) The presence of Cu resulted in a slight increase of Hs when the amount of Cu was less than 10%.
(3) The presence of a small amount of Mg, approximately 1%, remarkably decreased Hs. However, when the amounts of Mg in the melt were 2.5% and 5%, the hydrogen concentration changed with the lapse of time, and thus, Hs was not clearly determined.
(4) Hs decreased considerably when less than 10% of Zn was present in the melt.抄録全体を表示PDF形式でダウンロード (1989K) -
アルミニウム合金の被削性に関する研究(第2報)浅野 和彦, 藤原 明1972 年 22 巻 5 号 p. 340-345
発行日: 1972/05/30
公開日: 2008/07/23
ジャーナル フリーTurning tests of 2011 aluminum alloys, subjected to T3, T4, T6 and T8 treatments, were carried out and the free-machining properties were compared. The free-cutting characteristics could successfully be evaluated by a new method proposed by the present authors. In this new method, the number of chips out of a constant amount of machined materials is represented as a function of the cutting conditions. When T3-, T4- and T8-treated alloys were cut at high cutting velocities, by using tools with high side rake angles, chips of continuous stringy type were formed under a certain range of feed while discrete chips were formed under the other conditions. T6 treatment led to the formation of fine discrete chips under all conditions used. The good machinability was found to be produced by the heat treatment in order of T6>T8>T3>T4. However, the difference among the effects of T8-, T3- and T4-treatment on the machinability was negligibly small. The free-machining properties were independent of the kind and the distribution of aging products.抄録全体を表示PDF形式でダウンロード (826K) -
佐藤 四郎, 大越 登1972 年 22 巻 5 号 p. 346-350
発行日: 1972/05/30
公開日: 2008/07/23
ジャーナル フリーBandsawing tests were conducted on plates of 15, 20, 25 and 30 mm in thickness of aluminum alloys, 7N01-T6. 13 mm wide blades of hook-tooth type with 3 or 6 teeth per inch were used for these tests. Blade speed and feed rate were varied over broad ranges, and the 2-component dynamometer was used to measure the cutting and feeding forces simultaneously. The main results obtained were as follows.
(1) The cutting resistance increased with the increase of the feeding rate, while in the same feeding rate the cutting resistance decreased in the increase of the blade speed.
(2) The variation in the cutting resistance with the slight change of the feeding rate increased as the blade speed decreased. Thus, high blade speed cutting is recommended for aluminum alloys.
(3) The cutting force per tooth was approximatly equal to the feeding force per tooth.
(4) It is desirable that the cutting force per tooth and the power required for cutting remain unchanged when workpiece thickness varies. From this point of view, the optimum cutting conditions with variations of workpiece thickness were determined as shown in Fig. 11.抄録全体を表示PDF形式でダウンロード (939K) -
大谷 四聰, 津森 茂勝, 寺垣 正明1972 年 22 巻 5 号 p. 351-356
発行日: 1972/05/30
公開日: 2008/07/23
ジャーナル フリーWith the object of obtaining homogeneous ingots of titanium alloys which contain more than a few percent of high melting temperature elements such as W, Ta, Mo and Nb, the consumable electrode of vacuum arc melting was improved by using a mixed powder method. The macrosegregation of these elements in the commercial scale ingot was studied with a chemical analysis and a radiograph technique.
The optimum volume percentage of Mo in the above mentioned mixed powder was 40%, in order to get the homogeneous ingot of Ti-15Mo-5Zr alloys. The estimated melting temperature of the mixed powder was about 2, 170°C
Ta content was minimum at the center portion in the top of the Ti-5Ta ingot, because the partition coefficient of Ta was larger than 1. However, the degree of the Ta segregation in the above alloy was much smaller than the Co segregation in Ti-8Al-4Co alloys.
The ring pattern detected by radiography in Ti-5Ta billet was identified to be the indication of the slight concentration difference of Ta, which was caused by turbulence in the liquid-solid interface during solidification.抄録全体を表示PDF形式でダウンロード (1549K) -
星 晃1972 年 22 巻 5 号 p. 357-368
発行日: 1972/05/30
公開日: 2008/07/23
ジャーナル フリーPDF形式でダウンロード (3752K)
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