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Volume 1955 (1955)
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Volume 1955, Issue 15
Displaying 1-18 of 18 articles from this issue
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KIKUO YASUDA1955 Volume 1955 Issue 15 Pages 3-8
Published: May 30, 1955
Released on J-STAGE: October 30, 2008
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HIDEO NISHIMURA1955 Volume 1955 Issue 15 Pages 9-10
Published: May 30, 1955
Released on J-STAGE: October 30, 2008
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JIRO SATAKE1955 Volume 1955 Issue 15 Pages 11-12
Published: May 30, 1955
Released on J-STAGE: October 30, 2008
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TSUNEMASA NAKABACHI1955 Volume 1955 Issue 15 Pages 13
Published: May 30, 1955
Released on J-STAGE: October 30, 2008
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AKIRA MIYATA1955 Volume 1955 Issue 15 Pages 14-17
Published: May 30, 1955
Released on J-STAGE: October 30, 2008
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KINICHIRO FUJITA1955 Volume 1955 Issue 15 Pages 18-19
Published: May 30, 1955
Released on J-STAGE: October 30, 2008
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SHIGEYASU KODA, EIJI ISONO, SHIRO TERATO1955 Volume 1955 Issue 15 Pages 21-25,43
Published: May 30, 1955
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSWith a semi-continuous and continuous ingot casting apparatus of a very small scale (the diameter of ingots is 43mm or 47mm), the authors carried out some experiments to know how the casting conditions affect on the structure, the density and the grain size of the ingots.
The apparatus we used was shown in Fig. 1. The metal melted was commercially pure aluminium.
The results were as follows;
(1) The columnar grain structure was obtained when the casting temperature was above 700°C, but the fine and equiaxial one was obtained below the temperature. So it may be bad practice to cast the metal from too high temperature.
(2) Below the casting temperature of 700°C, the grain size diminished as the casting speed increased. But above 10cm/min of the casting speed, we obtained the structure of oriented very fine grains. The density diminished as the speed increased.
(3) To increase the casting speed over 10cm/min, the out-spraying of water was needed. The surface of ingot which were cast with the out-spraying was very good, so in practice the outspraying may be necessary.
(4) For the material of the mould, copper was better than iron or graphite. The ingots cast in copper mould had good surface and the casting operation was easy.
(5) The length of mould did not affect the structure but the casting operation became easy when the length was short, for the friction between the ingot and the mould was little.
(6) The friction between the ingot and the mould may be thought one important problem, so some researches on lubricants for this purpose must be carried out.View full abstractDownload PDF (1271K) -
HIDEHISA OSAWA, YUZO NAKAMURA, MOTOI NISHISAKA1955 Volume 1955 Issue 15 Pages 26-30,78_6
Published: May 30, 1955
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSComparison test between 3S and modified 3S were done and then the following results are obtained, Al-Mn-Mg (Mn 0.7, 1.0% Mg 0.25, 0.5%) alloy sheet rolled from the non-preheated slab has a superior anticorrodability against NaOH solution and its orange peel phenomenon seem to be same as in the preheated 3S sheet, but workability and anticorrodability against HCl solution decrease slightly.View full abstractDownload PDF (3221K) -
(1 ST REPORT) ON THE EXTRUSION PRESSURE OF LEAD AND TINTAKUICHI MORINAGA, YOSHIKAZU HOSOI, MAMORU YUKAWA1955 Volume 1955 Issue 15 Pages 31-38
Published: May 30, 1955
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSIt is described the effect of many various factors, which are die hole form, die angle, bearing length, reduction ratio and follower plate form, ets., on the extrusion pressure of Pb and Sn by direct method, as preliminary study on Al and its alloys.
The results obtained are as follows:
(1) Although the min, pressure is agree with the G. Sachs results, that the extrusion pressure is proportional to the logarithmic reduction ratio, max. pressure at the beginning of extrusion does not agree accurately.
(2) At the constant reduction ratio, max, and min. extrusion pressure in circle die are the largest of all other die hole forms, and the smallest is in triangle die.
(3) The largest pressure is determined by the two side ratio in rectangle dies at constant reduction ratio and it is smaller in the case of square or sheet form dies.
(4) Die angle which gives the smallest pressure is about 65° and the bearing length increases proportionally the max. and min. pressures which are in parallel.
(5) It is remarkably affected by the follower plate form, extrusion velocity, lubricant and temperature as in Fig. 12, 14. 15 and Table. 4.
(6) It is thought that the billet length greatly increases the max. pressure, but the min. one is constant from the results of Pb and Sn as in Fig. 16 and 17.View full abstractDownload PDF (1373K) -
TAKUICHI MORINAGA, YOSHIKAZU HOSOI, KUNIO MINAMI, OSAMU MORITA1955 Volume 1955 Issue 15 Pages 39-43
Published: May 30, 1955
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSIt is described the effect of many various factors on the extrusion pressure of pure aluminium by direct method as the same in the previous report. The results obtained are as follows:
(1) Although the accurate measuring of min extrusion. pressure is difficult owing to hot working, max. pressure changes in the same tendency as in Pb and Sn by reduction ratio.
(2) At the constant reduction ratio, max. pressures in circle die are the largest of all other die hole form, and the smallest is in triangle die.
(3) Die angle which gives the smallest pressure is about 75° and the bearing length increases proportionally the max. pressure.
(4) At the constant reduction ratio, two side ratio, in rectangle die which gives the smallest extrusion pressure is 1.
(5) It is remarkably affected by the follower plate forms and temperatures as is Fig. 8, 9 and 10.
(6) The billet length increases the max. pressure proportionally, but min. one is constant as in the case of Pb.View full abstractDownload PDF (568K) -
TAKUICHI MORINAGA, YOSHIKAZU HOSOI, TSUNETO TERAMOTO, AKIRA MATSUSHIMA1955 Volume 1955 Issue 15 Pages 44-49
Published: May 30, 1955
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSIn this report, it is described the effect of various factors, which have influence upon the extrusion pressure of pure aluminium as in previous report, on the hardness of pure aluminium extruded rods.
Studing the effect of extrusion temperature, billet length, velocity, reduction ratio, die angle and follower plate form, etc., on hardness, the results obtained are as follows:
(1) Tendencies, that the head hardness is mild and the tail is hard in longitudinal direction of extruded rods, and that the surrounding is hard and the centre is mild at the section of rods, are accelerated by the lower temperature extrusion.
(2) For the purpose of making the uniform hard rods in longitudinal direction, the billet length must be at least twice or more the diameter of it and the extrusion velocity must be fast mithin the limmits of grant.
(3) The hardness of the same form rod in section increases by reduction ratio and the hardenability is larger by about 75% reduction or more.
(4) At the constant reduction %, the hardness of corner and middle of long side at the section of rectangle rods is more mild at head in the case of sheet form than square one.
(5) Small die angle makes the hardness of rod increases and the plane follower plate makes it softest by all other follower plates.View full abstractDownload PDF (736K) -
TAKUICHI MORINAGA, YOSHIKAZU HOSOI1955 Volume 1955 Issue 15 Pages 50-58
Published: May 30, 1955
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSBeing thought that the extrusion pressure and the hardness of rod are effected by the flow of billet in container and entrance of die from the results in previous reports, this paper describes the experiments made in small press on the extrusion flow of pure aluminium.
This is the figures of the flow and the distribution and its change of hardness at the section of remaining billet during extrusion by direct method has been studied.
And it is discussed about the relations between the results obtained in experiment mentioned above and the extrusion pressure, etc.View full abstractDownload PDF (2716K) -
YOSHISHIGE TSUMURA1955 Volume 1955 Issue 15 Pages 59-65
Published: May 30, 1955
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSIn casting Aluminium alloys now used, most important and effective adding elements are Cu and Si as shown in SAE 306, 307, 303, 326, 329, 330, 331, and 332 type alloys and Fe is unavoidably contained. Then these casting alloys were regarded as Al-Fe-Si-Cu system alloy. In these alloys, Fe is most disliked becouse it decreases the mechanical properties and has the tendency of forming so-called "hard spots" in die casting. Al-Fe-Si constitutional diagram is well known as shown in Fig. 1. by H. W. L. Philips and P. C. Varley, but Al-Fe-Si-Cu diagram containing practical Cu content has not yet been studied in spite of its importance for common casting Aluminium alloys. It this report Al-Fe-Si-Cu diagram containing 4% of Cu which is most general content is studied using the samples slowly cooled from molten states in isolite mould which was conformed satisfactory for the purpose of determining the primary crystalization as compared with very slowly cooled specimen. Base alloys shown in Table 2 were made from 99.7% Al and mother alloys shown in Table 1 and then samples which contain 4% of Cu and constant Si content but have variation of 0.1% of Fe are made as shown in Table 3. Microstructres are shown in Photo. 100-169. From these results Fe limit. where Fe compound crystalizes as primary in Al-Fe-Si-Cu system containing 4% of Cu is determined as shown in Table 4. and Fig. 2. From this study, we understand that in the case of containing 4% of Cu, Fe limit of Al alloy containing 4-8% of Si is decreased about 0.5% as compared with non Cu and we must take care of decreasing of mechanical properties and formation of so-called "hard spots."View full abstractDownload PDF (2684K) -
HIDETAKE KUSAMICHI, TORO YUKAWA, HIDENORI TODA, HACHIRO KAJI1955 Volume 1955 Issue 15 Pages 66-69
Published: May 30, 1955
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe crude TiCl4 prepared by the chlorination of rutile or titaniferrous materials usually contains impure elements, and it is of a reddish or yellowish color. And in order to get high purity sponge titanium by Kroll process, it is necessary to remove such impurities before magnesium reduction. So we conducted on experiment to purify the crude TiCl4 by distillation and we got the following results:
1) According to literatures, Fe, V, Mn, Si, chlorine and phosgene had been considered as main impurities, but as the result of our experiment we confirmed that besides these element oxygen contained in crude TiCl4 also has deleterious effects on the titanium properties.
2) It may be rational to consider that oxygen contaminant is introduced into TiCl4 in the following manner: in the chlorination process or storage process TiCl4 reacts with the moisture in the air and forms Ti(OH)Cl3, Ti(OH)2Cl2 Ti(OH)3Cl, Ti(OH)4 and TiOCl2 etc.
3) To remove such impurities in crude TiCl4, it is expected that a better result will be obtained by performing the refluxation and distillation with such catalytic substances as charcoal, bentonite and copper.View full abstractDownload PDF (504K) -
SUEGORO OGURA, KAZUO SONOBE, MOSAO SHINOZAKI1955 Volume 1955 Issue 15 Pages 70-74
Published: May 30, 1955
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSWith regard to Ti-Cr system alloys containing Cr up to 10%, the effects of addition of Cr upon the various properties, e. g. hot workability, cold workability, heat-treatability, corrosion resistance, etc., were investigated, and the results were sa follows,
(1) Hot workability of Ti-Cr system alloys are relatively good, but their cold workability are very unfavourable.
(2) By heat-treatment, improvement in properties of a considerably wide range could be expected.
(3) By the addition of Cr, corrosion resistance towards concentrated acid, e. g. hydrochlorid acid, sulphoric acid, etc., deteriorates.View full abstractDownload PDF (1370K) -
YOSHITSUGU MISHIMA1955 Volume 1955 Issue 15 Pages 75-78
Published: May 30, 1955
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThough the production of sponge titanium in Japan has been remarkably increased in recent years, it seems to be long before the use of titanium and its alloys will be enough extensive to consume the major amount of the sponge produced. From the fact, it seems to be recommended to use titanium in other sphere of industry and therefore the study has been made to develope the use of titanium as an alloying element to non-ferrous alloys, as impurity problem seems to be more favourable than in ferrous alloys. The case of Cu-alloys has been reported this time. First small amount of titanium has been found to be successfully added to brass in the case of precision casting. 0.05-0.2%Ti has been added to 70-30 and 60-40 brass in three cases; 1) shell mould casting, 2) the same but the shell heated to 250°C and 3) investment casting (lost-Wax type). Second, a new high strength Cu alloy with Ti as a major alloying element has been developed in the author's laboratory, with superior mechanical properties as shown in Table 1.
For these uses, it is not necessary to supply high purity sponge, but low grade sponge, pure titanium scrap and daresay titanium alloy scrap (eg. Ti-130A, Ti-150A, RS 110 and Ti-Fe-Al alloys new in use in Japan) are seems to be equally useful. This will be serviciable for the reduction of prices of high purity sponge on one hand and the extremely high cost of working Ti alloys on the other. The experiments to use such scraps actually has been going on.View full abstractDownload PDF (537K) -
1955 Volume 1955 Issue 15 Pages 78
Published: 1955
Released on J-STAGE: October 30, 2008
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ARC-ARGONATMOSPHERE WELDING AND OXY-ACETYLENE WELDING, (FIRST REPORT)TAKAKADO NAKAYAMA, KOUSUKE OTAKA1955 Volume 1955 Issue 15 Pages 79-87
Published: May 30, 1955
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThis report illustrates the comparative experiments of tungsten-arc-argon atmosphere welding and oxyacetylene welding on the weldability and corrosion resistance of aluminium alloys in the part of experiments already accomplished. The remained part will be reported in another chance.
This includes two kinds of experiments as follows:-
1. The weldability of the plates of 52S, 56S, 0.5% Mg-Al alloy, A51S, 17S with each thickness of 1.6, 3.2, and 6.3mm are as follows: -The weldability were estimated by the tests of their tensile strength, elongation and thermal influence, produced to the plates butt-welded by means of tungsten-arc-argon atmosphere and oxyacetylene flame.
The results show the order of weldability as follows: -0.5% Mg-Al alloy, 52S, 56S, A51S, and 17S. And the more the thickness of sheets and plates, the less the weldability. And tungsten-arc-argon atmosphere welding was superior to oxyacetylene welding in this test, especially against thicker plates.
2. The corrosion resistance of the plates, butt-welded by means of tungsten-arc-argon atmosphere and oxyacetylene flame, of 61S, 52S, 53S, 63S, A51, AW10, 56S, Lloyd heat treatable alloy, which were made from the base metal of 99.7%Al, and 99.7% pure Al and 99.3% pure Al with each thickness of 1.6mm were as follows. The corrosion tests were examined by the decrease of tensile strength of the welded plates which were immersed as long as a year in the solution containing 6% table salt and 0.3% hydrogen peroxide.
The result did not show any difference in respect with the method of welding. We suppose this fact is due to that this test was applied on the butt welded pieces and therefore corrosion flux was removed from its surface. And we are now ensuring the corrosion testing on the crossweld of these alloys. The order of corrosion resistance of the alloys were as follows: -99.7%Al, 52S, 63S, 99.3%Al, 53S, Lloyd heat treatable alloy, 56S, A51S, AW10 and 61S.View full abstractDownload PDF (764K)
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