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29 巻, 7 号
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研究論文
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前川 静彌, 山下 健1957 年 29 巻 7 号 p. 490-499
発行日: 1957/07/25
公開日: 2012/11/05
ジャーナル フリーThe authors have completed the quantitative analysis method of tellurium slightly contained in pig iron and cast iron.
We have made some experiments on the effect of tellurium on the properties of gray and white cast iron. Conforming to these results, we made the study from various angles on the chilled dies.
The results obtained are as followings : —
(1) Tellurium remains well in cast iron, when it was added just before pouring at temperature 1300∼1320°C.
(2) Remelting of cast iron containing tellurium, however, will make tellurium in uneffective.
(3) Mechanical properties of hyper-eutectoid cast iron will not be improved by the tellurium addition.
(4) The extent of 0.005% tellurium in cast iron is not effective. Satisfactory results will be obtained by the content of tellurium of 0.02∼0.03%.
(5) Tellurium prevents the graphitization of cast iron powerfully and also it turns flake graphite into eutectic graphite.
(6) Characteristics of cast iron containing tellurium are its high hardness, high tensile strength and high impact value wi th fine crystal structures.
(7) High hardness will be observed in Te-Cr-Cu alloy cast irons.
(8) Tellurium should not be mixed with mold sand or wash. It will be recommended to apply the Tompkin's method to heavy castings and the Austin's to light castings.
(9) Chilled iron dies containing tellurium have the following excellence compared with ordinary forged steel dies ; twice as long in life, finer surface of manufactures, less fire cracks and lower in manufacturing cost.抄録全体を表示PDF形式でダウンロード (972K) -
—熔湯中の窒素による鋳造欠陥の発生について—池田 滋, 岩永 博, 小野 裕1957 年 29 巻 7 号 p. 499-507
発行日: 1957/07/25
公開日: 2012/11/05
ジャーナル フリーTo investigate the casting defects caused by the gases in molten iron, we added K3Fe(CN)6, Fe2O3, SiO2, Fe-Si and Al to the molten iron, which was poured in the special and the balanceweight type specimens.
Nitrogen contents were increased by addition of K3Fe(CN)6 and oxygen contents were increased by addition of Fe2O3 or SiO2.
Cast specimens of eutectic irons to which were added K3Fe(CN)6, showed special defects, and cast specimens of hypo-eutectic irons added K3Fe(CN)6. showed many small blow-holes. However cast specimens of eutectic and hypo-eutectic irons added Fe2O3 or SiO2, had no defects.
Further, special defects were increased by addition of ferro-silicon and decreased by addition of Aluminum.
From these results, it was shown that nitrogen in molten iron produced casting defects, having different features depending on the chemical composition of the metal.抄録全体を表示PDF形式でダウンロード (1283K) -
森永 卓一, 高橋 恒夫1957 年 29 巻 7 号 p. 508-514
発行日: 1957/07/25
公開日: 2012/11/05
ジャーナル フリーThis paper reports some factors of the influence on the manufacture of slab when the super-sonic fault detecting method is successfully applied. Some important factors are obtained by the authors by applying a comparatively simple but exact method. Also an interesting relation was found between the blister growing on the annealed aluminium plate and the fault detecting by the super-sonic method.
Some of the results obtained in this research are summarized as follows.
1) It is possible to indicate the degree of the fault by means of the total response and the frequency of the super-sonic fault locator and the number of pulses in the pulse transmission system.
2) Comparatively large faults, that is, crack, slag inclusion, blow holes and the like are detected in the echo obtained by the ordinary super-sonic method.
3) The super-sonic failure inspection by destroying the slab shows that the distribution of the pin holes well corresponds with the result of detection by the super-sonic method.
4) Utilizing the super-sonic method we can foretell the distribution of the larger blisters which actually appear on the rolled and annealed plate, while smaller blisters can not be located distinctly.抄録全体を表示PDF形式でダウンロード (965K) -
早川 一之, 渡部 多喜雄, 小野 伊祐1957 年 29 巻 7 号 p. 515-522
発行日: 1957/07/25
公開日: 2012/11/05
ジャーナル フリーFor these several years, the ramming methods of mold by sand slinger have developed in faundries. It has led to substantial reductions in labor costs and almost unbelievable increases in production. Using a sand slinger, an operator can quickly ram the required volume of sand into a mold of any size with minimum effort, maximum uniformity and controlled hardness.
The hydraulic sand slinger in the test is the one with hydraulic power controlling. Moreover, it is designed to direct the movement of the ramming arms by driving a handle.
We studied the relations between ramming speed (namely, oil pressures) and factors of the moldings.
Results obtained are as follows :
1) The clearance between liner and tip had better close, but maximum clearance is 2 mm
2) Greater distance, i. e., the larger clearance between the bottom of the ramming head and the top of the flask or the floor level, permits better standard deviation, but results in decrease in the mold hardness.
3) The speed of the ramming motor determines the mold hardness. Subsequently the faster the speed, the more increase the mold hardness. However the faster the ramming head moving over the mold area, the smaller the standard deviation and the harder the mold area rammed.抄録全体を表示PDF形式でダウンロード (873K) -
橋本 建次1957 年 29 巻 7 号 p. 522-527
発行日: 1957/07/25
公開日: 2012/11/05
ジャーナル フリーInfluence of height (ranging from 25 mm to 75 mm) of test piece, of which apparent density is constant, on properties of molding sands were studied. The results obtained were as follows :
1) The following equation is the relationship between compression strength σ and height H of test piece.
σ=α+b/H
where a and b are constants.
2) Permeability is not influenced by the height of test piece.
3) Top hardness increases linearly with increase of height of test piece, where bottom hardness decreases, and the value of (bottom hardness) / (top hardness) decreases proportionally with increase of height. It was also observed that it becomes l when the height is about 35∼45 mm.
4) Ramming energy necessary to mold a test piece increases proportionally with increase of height, but in the cace of using general molding sands the tangent of a line indicating the relationship increases from a point of about 45 mm of height.
And further several considerations are described on the dimension of test pieces using in a few countries.抄録全体を表示PDF形式でダウンロード (712K)
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